Artykuły w czasopismach: „DUAL-RESONANCE ANTENNA”

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Park, Daesung, i Jaehoon Choi. "A Dual-Band Dual-Polarized Antenna with Improved Isolation Characteristics for Polarimetric SAR Applications". Applied Sciences 11, nr 21 (26.10.2021): 10025. http://dx.doi.org/10.3390/app112110025.

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A dual-band dual-polarized antenna with high isolation characteristics is proposed for polarimetric synthetic aperture radar (PolSAR) applications. The antenna consists of four dipole antennas and 2 × 2 patch antenna arrays operating at the P-band (450–730 MHz) and Ka-band (34–36 GHz), respectively. The dipole antennas and the patch antenna arrays need dual-linear polarization characteristics to acquire PolSAR data. Improvements in the isolation characteristics at the P-band are achieved by inserting a metamaterial absorber with a fractal geometry between the transmitting (Tx) and receiving (Rx) dipole antennas. Without the absorber, the simulated isolation characteristics between the Tx and Rx antennas are lower than 19.2 dB over the target band. On the other hand, with the absorbers, the simulated isolation characteristics are higher than 23.44 dB over the target band, and remarkable improvement is achieved around the resonance frequency of the absorber. The measured results are in good agreement with the simulated ones, showing that the proposed antenna can be a good candidate for PolSAR applications.

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Kim, Donghyuk, Daniel Hernandez i Kyoung-Nam Kim. "Design of a Dual-Purpose Patch Antenna for Magnetic Resonance Imaging and Induced RF Heating for Small Animal Hyperthermia". Applied Sciences 11, nr 16 (8.08.2021): 7290. http://dx.doi.org/10.3390/app11167290.

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The popularity of patch antennas in magnetic resonance imaging (MRI) has reduced because of the large size required for patch antennae to resonate. Since the size of the patch antenna is associated with the wavelength and the wavelengths that are used in MRI are substantially large, large antennas are used. Methods of reducing patch antenna sizes have been proposed; however, these methods reduce the penetration depth and uniformity. In this study, we reduced the area of the patch antenna by 30% by folding the ground and patch planes in a zigzag pattern. The patch antenna produced two main resonant modes. The first mode produced a uniform magnetic field that was used for MRI. The second mode produced a strong and focused electric (|E|)-field, which was used for radiofrequency (RF) heating. Furthermore, we explored the use of a combination of two patch antennas aligned along the z-axis to provide a circular uniform magnetic flux density (|B1|) field at 300 MHz, which corresponds to the Larmor frequency in the 7T MRI system. In addition, the patch antenna configuration will be used for RF heating hyperthermia operating at 1.06 GHz. The target object was a small rat with insertion of colon cancer. Using the proposed configuration, we achieved |B1|-field uniformity with a standard deviation of 3% and a temperature increment of 1 °C in the mimic cancer tissue.

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Mondal, Saikat, Saranraj Karuppuswami, Deepak Kumar, Amanpreet Kaur i Premjeet Chahal. "A Miniaturized Dual Band Antenna for Harmonic RFID Tag". International Symposium on Microelectronics 2019, nr 1 (1.10.2019): 000033–36. http://dx.doi.org/10.4071/2380-4505-2019.1.000033.

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Abstract A miniaturized antenna is required for a small form factor RFID tag. For harmonic RFID tag, the tag should be capable of receiving and transmitting at two different frequencies (fundamental and harmonic). Implementation of two different antennas for the operation would increase the footprint of the antenna. Hence, an optimized antenna structure is proposed, which will have a small form factor while maintaining a considerable gain. The dual band antenna would be capable of receiving at fundamental frequency and transmit information at harmonic frequency while maintaining small tag size. The dual band antenna has a miniaturized rectangular board dimension of 96.5 mm and 81 mm with resonance at 434 MHz at low frequency and 860 MHz to 1000 MHz at high frequency. The harmonic tag was designed with nonlinear transmission line and the dual band antenna. The harmonic RF tag would be useful for numerous RF applications where the single frequency tags will not be a good option such as underground object tagging, tag detection in an industrial set up with strong reflectors such a metal in the vicinity. In this paper, the design, fabrication and characterization of dual band harmonic RFID tag antenna is presented.

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Ortiz, Noelia, Francisco Falcone i Mario Sorolla. "Gain Improvement of Dual Band Antenna Based on Complementary Rectangular Split-Ring Resonator". ISRN Communications and Networking 2012 (20.03.2012): 1–9. http://dx.doi.org/10.5402/2012/951290.

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A simple and successful dual band patch linear polarized rectangular antenna design is presented. The dual band antenna is designed etching a complementary rectangular split-ring resonator in the patch of a conventional rectangular patch antenna. Furthermore, a parametric study shows the influence of the location of the CSRR particle on the radiation characteristics of the dual band antenna. Going further, a miniaturization of the conventional rectangular patch antenna and an enhancement of the complementary split-ring resonator resonance gain versus the location of the CSRR on the patch are achieved. The dual band antenna design has been made feasible due to the quasistatic resonance property of the complementary split-ring resonators. The simulated results are compared with measured data and good agreement is reported.

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Ahmed, Z., M. M. Ahmed, M. B. Ihsan, A. A. Chaudhary i J. K. Arif. "Novel dual band patch antenna With Gap coupled composite right/left-handed transmission line". International Journal of Microwave and Wireless Technologies 11, nr 1 (7.08.2018): 87–93. http://dx.doi.org/10.1017/s1759078718001162.

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AbstractA novel low profile dual band patch antenna is presented. It consists of a composite right/left-handed transmission line (CRLH TL) unit cell gap coupled with the radiating edge of a rectangular patch antenna. The dual band behavior is achieved by coupling the zeroth order resonance mode of CRLH TL and TM10mode of the patch antenna. It is shown that frequency ratio can be changed by varying the gap between the patch and CRLH TL unit cell. The proposed configuration enables frequency reconfigurability by changing the CRLH TL unit cell using a switch. A prototype of the antenna having frequency ratiof2/f1= 1.08 is designed and fabricated. The proposed antenna shows measuredS11≤ −10 dB bandwidth of 100 and 50 MHz at resonance frequencies off1= 4.84 andf2= 5.22 GHz, respectively. A 2 × 2 dual band CRLH TL coupled patch array is also presented, showing more than 12.7 dBi gain at both resonance frequencies.

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6

Wang, H. "Dual-resonance monopole antenna with tuning stubs". IEE Proceedings - Microwaves, Antennas and Propagation 153, nr 4 (2006): 395. http://dx.doi.org/10.1049/ip-map:20050110.

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Kan, H. K., R. B. Waterhouse, A. Y. J. Lee i D. Pavlickovski. "Dual-resonance spiral-like shorted patch antenna". Electronics Letters 41, nr 10 (2005): 577. http://dx.doi.org/10.1049/el:20050533.

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Xu, He-Xiu, Guang-Ming Wang i Jian-Qiang Gong. "Compact Dual-Band Zeroth-Order Resonance Antenna". Chinese Physics Letters 29, nr 1 (styczeń 2012): 014101. http://dx.doi.org/10.1088/0256-307x/29/1/014101.

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Dahri, M. Hashim, M. R. Kamaruddin, M. H. Jamaluddin, M. Inam, S. Z. N. Zool Ambia i N. Shafie. "Dual resonance element for broadband reflectarray antenna". Indonesian Journal of Electrical Engineering and Computer Science 13, nr 2 (1.02.2019): 556. http://dx.doi.org/10.11591/ijeecs.v13.i2.pp556-561.

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A dual resonance reflectarray unit cell element has been proposed which evolved from a square patch element to enhance its bandwidth performance. A bend in the width of the element is used to modify its dimensions and surface currents for broadband operation. The results have been analyzed in the frequency band of 24 GHz to 28 GHz. Two different combinations of its dimensions are selected for the investigating of its various performance parameters. A maximum static phase range of 432° and 255° have been obtained with selected dimensions. The wide-band features of proposed unit cell element can be used particularly to design a broadband reflectarray antenna for future fast communication systems.

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Hossain, Md Ababil, Md Saimoom Ferdous, Shah Mahmud Hasan Chowdhury i Md Abdul Matin. "Novel Dual Band Microstrip Circular Patch Antennas Loaded with ENG and MNG Metamaterials". International Journal of Antennas and Propagation 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/904374.

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Novel design of a dual band microstrip circular patch antenna loaded with ENG (εnegative) metamaterial has been shown in the first section. Using ENG metamaterial instead of the conventional dielectric, unconventional TMδ10(1<δ<2) mode was produced to yield a dual band performance. Optimized parameters such as permittivity (ε1) and filling ratio (η) of metamaterials were selected with the aid of a MATLAB based parameter optimization algorithm, developed for all these sort of patch antennas. In the second section, a dual band circular patch antenna loaded with MNG (µ negative) metamaterial has been reported. An unconventional modified TMδ10(0<δ<1) mode has been produced along with conventional TM110mode due to using MNG metamaterial. Here also the optimum values of permeability (µ1) and filling ratio (η) for these sorts of patch antennas have been calculated from a MATLAB based parameter optimization algorithm. Both the proposed antennas provide good and resonance and satisfactory radiation performances (directivity, radiation efficiency, and gain) with a dual band performance.

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Li, Tianpeng, Jian Zhang, Baowei Cheng, Xue Lei, Zhijian Xu i Jun Gao. "Compact Wideband Dual-Frequency Antenna Based on a Simplified Composite Right/Left-Handed Transmission Line with Hilbert Curve Loading". International Journal of Antennas and Propagation 2019 (27.12.2019): 1–8. http://dx.doi.org/10.1155/2019/7380621.

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This paper addresses the issues of low bandwidth, gain, and efficiency of miniaturized microwave antennas by proposing a novel wideband dual-frequency coplanar waveguide antenna design based on a simplified composite right/left-handed (SCRLH) transmission line structure with Hilbert curve loading. The multifrequency characteristics of the SCRLH transmission line structure are evaluated theoretically, and the antenna parameters promoting bandwidth broadening under zeroth-order resonance (ZOR) and first-order resonance (FOR) mode operation are evaluated. The bandwidth broadening in the ZOR and FOR modes is accordingly revealed to be independent of the antenna length, and the structure therefore facilitates wideband operation under miniaturization. Finally, the dual-frequency ZOR and FOR mode antenna design with center frequencies of f0 = 1.865 GHz and f1 = 2.835 GHz is validated via simulation, and the performance of a compact prototype antenna is evaluated experimentally. The −10 dB return loss bandwidths at f0 and f1 are 187 MHz (from 1.773 GHz to 1.96 GHz) and 368 MHz (from 3.002 GHz to 3.37 GHz), and the corresponding relative bandwidths are 10.1% and 11.5%, respectively. The experimentally measured peak gains and radiation efficiencies at f0 are 1.54 dB and 81.3%, respectively, and those at f1 are 1.71 dB and 74.2%, respectively.

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Lin, Chih-Chung, Shao-Hung Cheng, Shu-Chuan Chen i Cheng-Siang Wei. "Compact Sub 6 GHz Dual Band Twelve-Element MIMO Antenna for 5G Metal-Rimmed Smartphone Applications". Micromachines 14, nr 7 (9.07.2023): 1399. http://dx.doi.org/10.3390/mi14071399.

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In this paper, a twelve-antenna system is designed for 5G smartphones with metal frames. The system is compact and operates on dual bands within the sub-6 GHz frequency range using multiple-input multiple-output (MIMO) technology. Two sets of six-antenna units are included in the system, arranged in a diagonal mirror-image configuration, and positioned at the center of the circuit board’s longer edges. The profile height of each of the six-antenna units is only 3 mm, and the overall array dimensions are 105 × 3 × 3.1 mm3. A single antenna unit is 15 × 3 × 3.1 mm3 (0.173 λ × 0.035 λ × 0.036 λ, where λ equals the free-space wavelength of 3450 MHz). The arrangement of the antennas in the six-antenna units is parallel, with a 3 mm separation between adjacent antennas. The antenna structure comprises of an inverted L-shaped feed branch and two inverted L-shaped short-circuit branches integrated into part of the metal frame. The proposed array can form multiple resonance paths, achieving dual-band operation at 3300–3600 MHz and 4800–5000 MHz. The measured isolation of this twelve-antenna system within the operating frequency band is over 10 dB, and the measured antenna efficiency is greater than 36%. Therefore, the system is suitable for use in smartphones with high screen-to-body ratios and metal frames.

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Puran, Amina, i Şehabeddin Taha İmeci. "Design and analysis of compact dual resonance patch antenna". Heritage and Sustainable Development 2, nr 1 (30.06.2020): 38–45. http://dx.doi.org/10.37868/hsd.v2i1.37.

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In this work a high gain dual resonance patch antenna is designed and simulated. Analysis is done while changing geometry and dielectric thickness. Main advantage of this type of antenna is its compact structure. Due to its dual characteristics it is very demanding in the communication industry which makes designing and analysing of this type of antenna more alluring. Values for S11 parameters are: -10.97dB and –30dB for 4.94GHz and 7.38GHz, respectively. Gain exceeds 8.85dB and 6.59dB for 4.94GHz and 7.38GHz, respectively. Characteristic impedance of the feed line is 50?.

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Singh, Ashish, Mohammad Aneesh i J. A. Ansari. "Analysis of Microstrip Line Fed Patch Antenna for Wireless Communications". Open Engineering 7, nr 1 (10.11.2017): 279–86. http://dx.doi.org/10.1515/eng-2017-0034.

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AbstractIn this paper, theoretical analysis of microstrip line fed rectangular patch antenna loaded with parasitic element and split-ring resonator is presented. The proposed antenna shows that the dualband operation depends on gap between parasitic element, split-ring resonator, length and width of microstrip line. It is found that antenna resonates at two distinct resonating modes i.e., 0.9 GHz and 1.8 GHz for lower and upper resonance frequencies respectively. The antenna shows dual frequency nature with frequency ratio 2.0. The characteristics of microstrip line fed rectangular patch antenna loaded with parasitic element and split-ring resonator antenna is compared with other prototype microstrip line fed antennas. Further, the theoretical results are compared with simulated and reported experimental results, they are in close agreement.

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Ahmad, Ashfaq, Farooq Faisal, Sadiq Ullah i Dong-You Choi. "Design and SAR Analysis of a Dual Band Wearable Antenna for WLAN Applications". Applied Sciences 12, nr 18 (14.09.2022): 9218. http://dx.doi.org/10.3390/app12189218.

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This paper presents the design of three types of dual band (2.5 & 5.2 GHz) wearable microstrip patch antennas. The first one is based on a conventional ground plane, whereas the other two antennas are based on two different types of two-dimensional electromagnetic band gap (EBG) structures. The design of these two different dual-band EBG structures using wearable substrates incorporates several factors in order to improve the performance of the proposed conventional ground plane (dual band) wearable antenna. The second EBG with plus-shaped slots is about 22.7% more compact in size relative to the designed mushroom-like EBG. Subsequently, we have demonstrated that the mushroom-like EBG and the EBG with plus-shaped slots improve the bandwidth by 5.2 MHz and 7.9 MHz at lower resonance frequencies and by 33.6 MHz and 16.7 MHz at higher resonance frequencies, respectively. Furthermore, improvements in gain of 4.33% and 16.5% at a frequency of 2.5 GHz and improvements in gain of 30.43% and 4.57% at 5.2 GHz have been achieved by using the mushroom-like EBG and EBG with plus-shaped slots, respectively. The operation of the conventional ground plane antenna is investigated under different bending conditions, such as wrapped around different rounded body parts. The proposed conventional ground plane antenna is placed over a three-layered (flat body phantom (chest)) and four-layered (rounded body parts) tissue models, and a thorough SAR analysis has been performed. It is concluded that the proposed antenna reduces SAR effects (<2 W/kg) on the human body, thereby making it useful for numerous critical wearable applications.

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Li, Rongqiang, Bo Li, Guohong Du, Xiaofeng Sun i Haoran Sun. "A Compact Broadband Antenna with Dual-Resonance for Implantable Devices". Micromachines 10, nr 1 (16.01.2019): 59. http://dx.doi.org/10.3390/mi10010059.

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A compact broadband implantable patch antenna is designed for the field of biotelemetry and experimentally demonstrated using the Medical Device Radiocommunications Service (MedRadio) band (401–406 MHz). The proposed antenna can obtain a broad impedance bandwidth by exciting dual-resonant frequencies, and has a compact structure using bent metal radiating strips and a short strategy. The total volume of the proposed antenna, including substrate and superstrate, is about 479 mm3 (23 × 16.4 × 1.27 mm3). The measured bandwidth is 52 MHz (382–434 MHz) at a return loss of −10 dB. The resonance, radiation and specific absorption rate (SAR) performance of the antenna are examined and characterized.

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Kanagasabai, Malathi, Shanmathi Shanmuganathan, M. Gulam Nabi Alsath i Sandeep Kumar Palaniswamy. "A Novel Low-Profile 5G MIMO Antenna for Vehicular Communication". International Journal of Antennas and Propagation 2022 (7.10.2022): 1–12. http://dx.doi.org/10.1155/2022/9431221.

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The proposed work is a novel low-profile 5G MIMO antenna configuration to exhibit dual-band frequencies for 5G NR-n2 band (1.9 GHz) and safety band (ITS-5.9 GHz) in vehicular communication. In the proposed antenna, it is quite difficult to achieve the lowest resonance frequency in a comparatively miniaturized dimension concerning its operating wavelength. The designed antenna is a modified square patch with the dual-band resonance achieved by the incorporation of slots for increasing the electrical length within the dimension. Hence, the design comprises ring and loop slots exhibiting resonance at 1.9 GHz and the loop U, and modified-W slots for 5.9 GHz. The antenna achieves 1.9% and 0.64% impedance bandwidth and a peak gain of 1.944dBi and 6.06dBi at the resonant frequencies of 1.9 GHz and 5.9 GHz, respectively, with dimensions of 0.114λo × 0.114λo × 0.0016λo, where λo is the wavelength of the lowest operating frequency. The MIMO configuration is presented to assess the antenna’s suitability for large-scale applications. The MIMO antenna presented here is deployed with the edge-to-edge distance between the single element radiators being 0.01λo by parametric sweep. The presented MIMO antenna provides an isolation value greater than 19 dB because of reduced mutual coupling between the single element radiators in that MIMO structure due to the presence of a ground slot. The ECC values are 1.659 × 10−9 and 0.000601 for frequencies of 1.9 GHz and 5.9 GHz, respectively, and the diversity gain is relatively near 10 dB, which is the acceptable value for MIMO antennas. This modified square single-element and MIMO antenna provides a relatively higher gain and better performance in vehicular communication for GSM and safety applications. The MIMO configurations’ on-vehicle analysis is performed to check the reliability of the designed antenna in a vehicular environment.

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Dewan, Raimi, M. K. A. Rahim, Mohamad Rijal Hamid i M. F. M. Yusoff. "Analysis of Wideband Antenna Performance over Dual Band Artificial Magnetic Conductor (AMC) Ground Plane". Applied Mechanics and Materials 735 (luty 2015): 273–77. http://dx.doi.org/10.4028/www.scientific.net/amm.735.273.

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A Coplanar Waveguide (CPW) wideband antenna operates from 2.69 GH to 6.27 GHz which act as reference antenna (RA) has been designed. A Dual Band AMC (DBAMC) unit cells have been proposed to operate at 2.45 GHz and 5.8 GHz. AMC is a metamaterial which mimics the behavior of zero reflection phase of Perfect Magnetic Conductor (PMC) at resonance frequency which not naturally existed in nature. Subsequently the antenna is incorporated with AMC unit cell, herein referred as Antenna with Dual Band AMC (ADBAMC). The DBAMC succesfully excites additional resonance at 2.45 GHz outside the initial operating range of standalone CPW wideband antenna. Incorporation of DBAMC to antenna achieves back lobe suppression at 2.45 GHz and 5.8 GHz. The overall average gain of AMC incorporated antenna is improved from 2.69 to 6.29 GHz as opposed to the standalone reference CPW wideband antenna. Study of surface current is also presented and discussed.

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Surendran, Arjun, Aravind B, Tanweer Ali, Om Prakash Kumar, Pradeep Kumar i Jaume Anguera. "A Dual-Band Modified Franklin mm-Wave Antenna for 5G Wireless Applications". Applied Sciences 11, nr 2 (12.01.2021): 693. http://dx.doi.org/10.3390/app11020693.

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Franklin array antennas are considered as one of the most competitive candidates for millimeter-wave (mmW) 5G applications due to their compact size, simple geometry and high gain. This paper describes a microstrip Franklin antenna array for fifth generation (5G) wireless applications. The proposed modified Franklin array is based on a collinear array structure with the objective of achieving broad bandwidth, high directivity, and dual-band operation at 22.7 and 34.9 GHz. The designed antenna consists of a 3 × 3 array patch element as the radiating part and a 3 × 3 slotted ground plane operating at a multiband resonance in the mmW range. The dimensions of the patch antennas are designed based on λ/2 of the second resonant frequency. The designed antenna shows dual band operation with a total impedance bandwidth ranging from 21.5 to 24.3 GHz (fractional bandwidth of 12.2%) at the first band and from 33.9 to 36 GHz (fractional bandwidth of 6%) at the second band in simulation. In measurement, the impedance bandwidth ranges from 21.5 to 24.5 GHz (fractional bandwidth of 13%) at the first band and from 34.3 to 36.2 GHz (fractional bandwidth of 5.3%) at the second band, respectively. The performance of the antenna is analyzed by parametric analysis by modifying various parameters of the antenna. All the necessary simulations are carried out using HFSS v.14.0.

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Dai, Xi-Wang, Tao Zhou i Bo-Ran Guan. "Dual-band low-profile planar antenna for mobile communication application". International Journal of Microwave and Wireless Technologies 9, nr 2 (8.12.2015): 447–52. http://dx.doi.org/10.1017/s1759078715001671.

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A novel dual-band planar antenna with a low profile for mobile communication system is proposed in this paper. The antenna is composed of one shorted patch with two radiating notches for low frequency resonance and one square patch for high frequency resonance. The low profile is achieved via the shorting patch, which introduces the parallel electrical field between the reflector and antenna. A step-impedance microstrip line is used to feed the antenna. The coupling between the square patch and microstrip line cancels out the inductance of shorting probe, which increases the working bandwidth of proposed antenna. A prototype with a low profile of 0.0286λ is fabricated and measured. The antenna achieves dual impedance bandwidths of 1.6% for the low frequency band and 60% for the high frequency band, covering the frequency range 851–865 MHz and 1.97–3.65 GHz, respectively. The measured results show good agreements with the simulated ones.

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Djouablia, Linda, Aziza Zermane i Kamel Menighed. "Investigation of Multi-Band Reconfigurable Triangular Microstrip Antenna on Magnetic YIG Substrate". ASM Science Journal 17 (8.12.2022): 1–8. http://dx.doi.org/10.32802/asmscj.2022.1234.

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Reconfigurable antennas based on magnetised ferrite substrate and electronic components present a remarkable interest for nowadays antennas. The present research contribution deals to investigate an efficient multiband tuneable triangular microstrip antenna with acceptable characteristics, able to operate from 2.6 GHz to 5.8 GHz requiring frequency and polarization agility by dual reconfigurability using a YIG (Yttrium Iron Garnet) substrate and PIN diode. Different magnetic bias fields were applied to the proposed antenna for ON and OFF states. The obtained results and analysis demonstrate the efficiency of magnetic frequency tuning and a high stability of the radiated field, the antenna bandwidth can reach 1300 MHz for ON state, and a maximum tuning range close to 550 MHz is observed. The proposed antenna design exhibits a linear polarization and stable E and H–plane radiation pattern performance at resonance frequencies over the operating bands. These characteristics make the antenna suitable for multiband wireless communications requiring frequency agility.

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Shivangi, Soni, Chandan, Kumar Singh Ashutosh i Yadav Hema. "A compact microstrip patch antenna with DGS for WiFi/WiMAX/WLAN". i-manager's Journal on Communication Engineering and Systems 12, nr 1 (2023): 1. http://dx.doi.org/10.26634/jcs.12.1.19756.

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In recent years, the study of microstrip patch antennas has witnessed significant advancements, offering numerous advantages and promising prospects compared with conventional antennas. These antennas are characterized by their lightweight compact size, low cost, low profile, small dimensions, and excellent conformability. Additionally, microstrip patch antennas exhibit various desirable features, such as dual and circular polarization, dual-frequency operation, broad bandwidth, flexible feedline configurations, and beam-scanning omnidirectional patterns. In this paper, a microstrip patch antenna design tailored for the 2.4 GHz frequency band is proposed, showcasing its potential for applications in wireless communication devices. The antenna is engineered to operate across multiple bands, including the wireless device band, Ultra Wide Band (UWB), and X band. It has a truncated rectangle shape with additional stubs, whereas the substrate material employed is FR4. The resulting design achieves resonance at four different frequencies, effectively covering the Microwave Access (WiMAX) band at 2.5 GHz and 4 GHz. Notably, the implementation of Digital Global Systems (DGS) plays a crucial role in reducing the antenna size while simultaneously enhancing its performance. The proposed microstrip patch antenna demonstrates great potential for meeting the increasing demand of modern wireless communication devices. Its multiband operation, compact size, and improved performance, achieved through the integration of DGS, make it a promising candidate for various wireless communication applications.

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Bie, Shuhang, i Shi Pu. "Array Design of 300 GHz Dual-Band Microstrip Antenna Based on Dual-Surfaced Multiple Split-Ring Resonators". Sensors 21, nr 14 (19.07.2021): 4912. http://dx.doi.org/10.3390/s21144912.

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To meet the increasing need of high-data-rate and broadband wireless communication systems, the devices and its circuits R&D under Millimeter, Sub-Millimeter, or even Terahertz (THz) frequency bands are attracting more and more attention from not only academic, but also industrial areas. Most of the former research on the THz waveband (0.1–10 THz) antenna design is mainly focused on realizing high directional gain, such as horn antennas, even though the coverage area is very limited when comparing with the current Wi-Fi system. One solution for the horizontally omnidirectional communication antenna is using the structure of multiple split-ring resonators (MSRRs). Aiming at this point, a novel 300 GHz microstrip antenna array based on the dual-surfaced multiple split-ring resonators (DSMSRRs) is proposed in this paper. By employing the two parallel microstrip transmission lines, different MSRRs are fed and connected on two surfaces of the PCB with a centrally symmetric way about them. The feeding port of the whole antenna is in between the centers of the two microstrip lines. Thus, this kind of structure is a so-called DSMSRR. Based on the different size of the MSRRs, different or multiple working wavebands can be achieved on the whole antenna. Firstly, in this paper, the quasi-static model is used to analyze the factors affecting the resonance frequency of MSRRs. Simulation and measured results demonstrate that the resonant frequency of the proposed array antenna is 300 GHz, which meets the design requirements of the expected frequency point and exhibits good radiation characteristics. Then, a dual-band antenna is designed on the above methods, and it is proved by simulation that the working frequency bands of the proposed dual-band antenna with reflection coefficient below −10 dB are 274.1–295.6 GHz and 306.3–313.4 GHz.

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Abdulkawi, Wazie M., Abdel Fattah A. Sheta, Ibrahim Elshafiey i Majeed A. Alkanhal. "Design of Low-Profile Single- and Dual-Band Antennas for IoT Applications". Electronics 10, nr 22 (12.11.2021): 2766. http://dx.doi.org/10.3390/electronics10222766.

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This paper presents novel low-cost single- and dual-band microstrip patch antennas. The proposed antennas are realized on a square microstrip patch etched symmetrically with four slots. The antenna is designed to have low cost and reduced size to use in Internet of things (IoT) applications. The antennas provide a reconfigurable architecture that allows operation in different wireless communication bands. The proposed structure can be adjusted to operate either in single band or in dual-band operation. Two prototypes are implemented and evaluated. The first structure works at a single resonance frequency (f1 = 2.4 GHz); however, the second configuration works at two resonance frequencies (f1 = 2.4 GHz and f2 = 2.8 GHz) within the same size. These antennas use a low-cost FR-4 dielectric substrate. The 2.4 GHz is allotted for the industrial, scientific, and medical (ISM) band, and the 2.8 GHz is allocated to verify the concept and can be adjusted to meet the user’s requirements. The measurement of the fabricated antennas closely matches the simulated results.

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Mansour, Mohamed, Kamel Sultan i Haruichi Kanaya. "Compact Dual-Band Tapered Open-Ended Slot-Loop Antenna For Energy Harvesting Systems". Electronics 9, nr 9 (28.08.2020): 1394. http://dx.doi.org/10.3390/electronics9091394.

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In this study, a compact dual-band combined loop-slot planar antenna is proposed. (1) Background: multi-function antennas are desired for wireless communication to cover the desired frequency spectrum. (2) Methods: the proposed antenna consists of a semi-rectangular open-ended loop (OEL) operating at the lower frequency band 920 MHz, an open-ended slot (OES) transmission line that provides resonance at the higher band 2.4 GHz, and a feeding port using the asymmetric coplanar strip (ACS) line. The ACS is used to excite the antenna to achieve dual-band performance. The overall dimensions of the fabricated prototype are 32.5 × 53.5 mm2 (0.1λo×0.16λo), where λo represents the free-space wavelength at the lower frequency. (3) Results: from the calculations, the antenna shows two impedance bandwidths (estimated at −10dB) of 30 MHz (920–950 MHz) and 300 MHz (2.2–2.5 GHz) to cover the ISM band (920 MHz) and 2.45 GHz WiFi bands, respectively. Indeed, the antenna has stable radiation patterns and achieves peak measured realized gain of 1.8 dBi in the lower band and 4.2 dBi in the higher band. (4) Conclusion: the antenna shows the merits of low profile structure, single-layer, and low-cost fabrication. The proposed antenna not only achieves incremental increase in radiation efficiency, but also provides a lightweight, and small footprint.

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Baccouch, C., D. Bouchouicha, H. Sakli i T. Aguili. "Patch Antenna based on a Photovoltaic Cell with a Dual resonance Frequency". Advanced Electromagnetics 5, nr 3 (11.11.2016): 42. http://dx.doi.org/10.7716/aem.v5i3.425.

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The present work was to use photovoltaic solar cells in patch antenna structures. The radiating patch element of a patch antenna was replaced by a solar cell. Direct Current (DC) generation remained the original feature of the solar cell, but additionally it was now able to receive and transmit electromagnetic waves. Here, we used a new patch antenna structure based on a photovoltaic solar cell. It was then used to collect photo-generated current as well as Radio Frequency (RF) transmission. A mathematical model which would serve the minimization of power losses of the cell and therefore the improvement in the conversion efficiency was studied. A simulation allowed analysing the performance of the antenna, with a silicon material, and testing its parameters such as the reflection coefficient (S11), gain, directivity and radiated power. The performance analysis of the solar cell patch antenna was conducted using Advanced Design System (ADS) software. Simulation results for this antenna showed a dual resonance frequency of 5.77 GHz and of 6.18 GHz with an effective return loss of -38.22dB and a gain of 1.59dBi.

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Erat, Abdurrahim. "Design and Analysis of A Microwave Dual Band Microstrip Patch Antenna (MPA) for Wireless Communication Applications". Academic Perspective Procedia 2, nr 3 (22.11.2019): 711–19. http://dx.doi.org/10.33793/acperpro.02.03.78.

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This paper presents the design and simulation of a microstrip patch antenna (MPA) which is modeled by placing several rectangular copper layer with conductive characteristics on a substrate material with dielectric constant 3.0 and 22x18x1 mm3 geometry. This microstrip path was designed with copper material which had a very thin thickness for patch and ground. In this study, a change in resonance frequency and return loss characteristics were observed for several substrate thickness values. The radiation characteristics of the single and dual band microstrip patch antennas (MPAs) are analysed in the frequency range of 5 &ndash; 25 GHz. The microstrip patch antenna (MPA) radiate at a frequency of 15.32 GHz with -45 dB return loss. For the designed single and dual band MPA design, some electromagnetic properties such as return loss, surface current and radiation patterns were simulated. The characteristic of goods and chattels of the proposed antenna are analyzed by using the software CST Microwave Studio.

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Yang, Guangyao, Shengbo Ye, Feng Zhang, Yicai Ji, Xiaojuan Zhang i Guangyou Fang. "Dual-Polarized Dual-Loop Double-Slot Antipodal Tapered Slot Antenna for Ultra-Wideband Radar Applications". Electronics 10, nr 12 (8.06.2021): 1377. http://dx.doi.org/10.3390/electronics10121377.

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The miniaturized high-gain antenna is required in portable, ultra-wideband radar systems. However, the miniaturization, ultra-wideband and high gain often restrict each other in the antenna design. In this paper, a dual-polarized, double-slot, antipodal tapered slot antenna with a double-layer, dual-loop structure and novel slot edges is presented. The proposed magnetic dual-loop structure has the capacity to reduce the low cut-off frequency of the double-slot tapered slot antenna by weakening the resonance and coupling. In addition, the high gain, low sidelobe level (SLL), and low cross-polarization level are achieved in the boresight direction. A novel gradient slot profile is designed to improve the low-frequency directivity of the tapered slot antenna without affecting the matching. To feed the antenna elements, a kind of wideband, balun-divider structure is designed. The dual-polarized antenna is combined by two orthogonal elements in a cross configuration without galvanic contact or influence to performance. The measured results show that the impedance bandwidth of the proposed antenna is 0.6~4 GHz, and the maximum gain is 11 dBi. The isolation between the two antenna ports is better than 32 dB, and the cross-polarization discrimination (XPD) is better than 20 dB.

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Yan, Dong, Li Huang, Ping Wang i Yu Liu. "An H-Shaped Dual-Band Microstrip Patch Antenna". Advanced Materials Research 651 (styczeń 2013): 668–72. http://dx.doi.org/10.4028/www.scientific.net/amr.651.668.

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An H-shaped dual-band microstrip patch antenna is presented which supports two resonance frequencies at 2.5 GHz and 5.01 GHz. Firstly, the design method of antenna size is proposed. Then this antenna is simulated and optimized in High Frequency Structure Simulator (HFSS). Finally, the parameters of this antenna are obtained. Impedance bandwidth for center frequencies of 2.5 GHz and 5.01 GHz are 0.1 GHz (2.45 GHz~2.55 GHz) and 0.14 GHz (4.95 GHz~5.09 GHz), respectively.

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Askarian, Amirhossein, Jianping Yao, Zhenguo Lu i Ke Wu. "Leaky-wave radiating surface on heterogeneous high-κ material for monolithic antenna-frontend integration". Journal of Applied Physics 133, nr 7 (21.02.2023): 074502. http://dx.doi.org/10.1063/5.0136228.

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In a highly integrated analog radio-over-fiber transceiver, seamless integration of the antenna-frontend is crucial as an antenna is generally implemented on a high-κ material, which is set to highly degrade the antenna's performance. This work is concerned with the radiation behavior improvement of a planar leaky-wave antenna with an inductive partially reflecting surface (PRS) on a high-κ substrate for the development of a highly directive antenna. To begin with, we show how a thin and single-mode resonance (SMR) inductive PRS on high-κ materials in a planar leaky-wave antenna is set to provoke two resonance frequencies (i.e., PRS and cavity resonances) to converge, thereby diminishing the antenna's broadside directivity. By applying an equivalent circuit model, we explain how a multi-mode resonance (MMR) PRS can adequately be applied to address the underlying challenges. Subsequently, the leaky-wave radiation behavior of an antenna with a heterogeneous substrate is investigated and analytical equations are derived and verified with a full-wave simulation. The effects of material permittivity and thickness in a heterogeneous-cavity antenna on leaky-wave performance are investigated using these approximate yet accurate-enough equations. To justify the findings, two 9 × 9 planar leaky-wave antennas are prototyped on heterogeneous substrates based on SMR and MMR PRS and the radiation performances are compared. Our investigations reveal that in the proposed scenario, an MMR PRS can significantly enhance the antenna's broadside directivity by over 4 dBi at the resonance frequency (27.5 GHz), which is also set to improve radiation pattern compared to a SMR-based antenna. Finally, a single-fed dual-band aperture-shared antenna with a large frequency ratio (S-band and Ka-band) is developed and fabricated on a high-κ substrate based on the proposed MMR PRS.

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Kumar, Sandeep, Akhilendra Pratap Singh i Ashutosh Mishra. "Design and Analysis of Novel Microstrip-Based Dual-Band Compact Terahertz Antenna for Bioinformatics and Healthcare Applications". International Journal of Mathematical, Engineering and Management Sciences 8, nr 5 (1.10.2023): 850–68. http://dx.doi.org/10.33889/ijmems.2023.8.5.049.

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This paper presents a compact microstrip-based dual-band antenna for terahertz (THz) technology, catering to the increasing demand for high-frequency, high-gain, and wideband THz antennas. THz technology has numerous applications, including its demands in bioinformatics and healthcare. To address this need, the proposed antenna operates in two frequency bands: 3.6 THz to 4.3 THz and 5 THz to 5.7 THz, enabling its use in THz band communication. The antenna design features a microstrip patch with two transverse slots and one longitudinal slot as a radiator, fed with a microstrip line. The transverse slots enable dual-band resonance, while the longitudinal slots enhance bandwidth and efficiency. Using a 10µm thick polyamide material with a dielectric constant of 3.55, the antenna achieves a compact size of 40 × 40 µm2, lightweight construction, high radiation efficiency, and a wide impedance bandwidth. Simulation results confirm good impedance matching characteristics, with minimal voltage standing wave ratio and return loss of -10dB or less. The antenna exhibits an impedance bandwidth of -10dB at 700 GHz, a peak radiation efficiency of 85%, a peak gain of 7.86 dB, and an omnidirectional radiation pattern. These favorable attributes position the proposed antenna as an excellent choice for various THz applications, particularly in bioinformatics and healthcare applications.

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Tauseef Asim, Muhammad, i Mushtaq Ahmed. "Metamaterial Inspired Microstrip Antenna Investigations Using Metascreens". International Journal of Antennas and Propagation 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/236136.

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A dual layer periodically patterned metamaterial inspired antenna on a low cost FR4 substrate is designed, simulated, fabricated, and tested. The eigenmode dispersion simulations are performed indicating the left handed metamaterial characteristics and are tunable with substrate permittivity. The same metamaterial unit cell structure is utilized to fabricate a metascreen. This metascreen is applied below the proposed metamaterial antenna and next used as superstrate above a simple patch to study the effects on impedance bandwidth, gain, and radiation patterns. The experimental results of these antennas are very good and closely match with the simulations. More importantly, the resonance for the proposed metamaterial antenna with metascreen occurs at the left handed (LH) eigenfrequency of the metamaterial unit cell structure. The measured −10 dB bandwidths are 14.56% and 22.86% for the metamaterial antenna with single and double metascreens, respectively. The metascreens over the simple patch show adjacent dual band response. The first and second bands have measured −10 dB bandwidths of 9.6% and 16.66%. The simulated peak gain and radiation efficiency are 1.83 dBi and 74%, respectively. The radiation patterns are also very good and could be useful in the UWB wireless applications.

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Ushasree, A., i Vipul Agarwal. "Pentaband Dual-Polarized Antenna for Multiservice Wireless Applications". Computation 11, nr 4 (8.04.2023): 76. http://dx.doi.org/10.3390/computation11040076.

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This paper presents a novel design for and an experimental study of a dual-polarized quad-port MIMO antenna. The design achieves resonance at five distinct frequency bands with reduced mutual coupling. The design includes a single annular ring slot, four truncated rectangular corners, and a truncated aperture to improve resonance behavior. The design is then extended to a four-port MIMO antenna by including a ground-plane slit to enhance isolation between antenna elements at the center resonance band. The antenna achieves resonances at 5 distinct bands, ranging from 1.5 to 8.4 GHz, with significant mutual coupling reductions. The resonances of the quad-port pentaband MIMO antenna are achieved at 1.55 GHz (1.5–1.65 GHz), 2.5 GHz (2.4–2.7 GHz), 5.2 GHz (5–5.85), 7.3 GHz (7.1–7.4), and 8.15 GHz (7.9–8.4), with respective mutual coupling reductions of 27 dB, 37 dB, 21 dB, 29 dB, and 21 dB. Additionally, the 3 dB axial ratio bandwidth (ARBW) is observed at 6.5% (1.5–1.6 GHz) and 15% (2.4–2.7 GHz) in 2 distinct bands, and the envelope correlation coefficient and diversity gain are calculated within the specified band range. Experimental measurements of the prototype for the quad-port antenna are conducted, with excellent agreement found between the results and the simulations.

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Beigi, Payam, Yashar Zehforoosh, Mirhamed Rezvani i Javad Nourinia. "Evaluation of a compact triangular crinkle-shaped multiband antenna with circular polarized for ITU band based on MADM method". Circuit World 45, nr 4 (4.11.2019): 292–99. http://dx.doi.org/10.1108/cw-04-2019-0040.

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Purpose This paper aims to present a new triangular crinkle-shaped multiband antenna for multiband operation. Design/methodology/approach This paper refers to increasing the number of resonance frequency by appending triangular crinkle. Experimental frequency results of the presented antenna are 1.60/2.80/4.00/5.80/7.12/8.32/10.06 GHz. Findings The triangular shaped antenna is manufactured on a low-priced FR-4 substrate with small size and tested. The reported antenna with full size 14 × 14 mm2 with a half elliptical ground sheet on the bottom plane of the substrate and a triangular crinkle strip patch in the front of the substrate. The reported antenna has dual polarized, by rectangular slits on the ground sheet can produce the CP radiation on ITU band. The radiation characteristics indicate the mentioned antenna plays good task for multiband structures. Simulation and measured consequences are in desirable agreement and refer to agreeable operation for the introduced antenna. Originality/value Also, an evaluation is done based on multiple attribute decision-making method for comparison the proposed monopole antenna with some previously presented multiband monopole antennas.

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35

Dhandade, Swati. "Design and Analysis of MIMO Dual Band Patch Antenna for 5G New Radio Applications in Mobile Terminals". International Journal for Research in Applied Science and Engineering Technology 9, nr VI (30.06.2021): 5446–51. http://dx.doi.org/10.22214/ijraset.2021.36072.

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This paper presents a dual-band MIMO antenna design with compact size for 5G communication under 6 GHz band frequency. The metallic monopole stub structure is used to miniaturization of antenna. The L-shape monopole antenna is modified by adding semi-circular element in radiating structure of monopole to obtain dual-band resonance. The High isolation is achieved by employing T-shaped stub in ground plane.It has compact size is 45 mm × 25 mm × 1.6 mm3. The proposed Dual Band MIMO antenna has been design on FR4 material with ɛr = 4.4 with 1.6 thickness. The proposed antenna has 5G application in the bands of 2.5 GHz (2.34 GHz-2.62 GHz) and 3.5 GHz (3.20 GHz-5.20 GHz). The bandwidth of antenna getting 320MHz and 2500MHz at 2.5GHz and 3.5GHz respectively. The Isolation (S21) of proposed antenna is -31.2 dB at 2.5 GHz and -19.5 dB at 3.5 GHz. VSWR is less than 1.06 for both the bands. The designed dual band MIMO antenna covers 5G bands of 2.3-2.4GHz (n30/n40), 2.4-2.5GHz (n7/n38/n41/n90), and 3.2-5.2GHz (n77/n78/n80). The experimental and simulated results observed good matching except some slight variation. This proposed dual band MIMO antenna is suitable for 5G mobile Communications.

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36

Saxena, Ravi Shankar, S. Kavitha, Ashish Singh i Anurag Mishra. "Effects of dielectric substrate material microstrip antenna for limited band applications". Journal of Physics: Conference Series 2070, nr 1 (1.11.2021): 012124. http://dx.doi.org/10.1088/1742-6596/2070/1/012124.

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Abstract In this paper, an analysis of dual frequency resonance antenna is achieved by OM-shape microstrip patch antenna. The proposed antenna is analyzed using IE3D simulation software. The analysis of proposed structure is done by varying the dielectric constants and height of the substrate as well as gain and radiation pattern of the antenna is obtained. It observed that on varying the dielectric substrate the effect on proposed antenna is very effective.

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Singh, Sandeep Kumar, Tripurari Sharan i Arvind Kumar Singh. "Investigating the S-parameter (|S11|) of CPW-fed antenna using four different dielectric substrate materials for RF multiband applications". AIMS Electronics and Electrical Engineering 6, nr 3 (2022): 198–222. http://dx.doi.org/10.3934/electreng.2022013.

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<abstract> This article aims to examine the |S11| parameter of a multiband Coplanar Waveguide (CPW)-fed antenna. The proposed square-shaped antenna-1 (Ant.1) and antenna-2 (Ant. 2) are primarily composed of three ground terminal stubs: Terminal-1 (T1), Terminal-2 (T2), and Terminal-3 (T3), all of which have an inverted L-shaped radiating patch. The proposed antennas' resonance frequencies (<italic>fr</italic>) can be adjusted by the electrical dimension and length of the stub resonators, the dielectric constant (ε<italic>r</italic>) of substrate materials, and their appropriate thicknesses. It will have an impact on their return loss (|S11|), Impedance Bandwidth (IBW), radiation pattern, and antenna performance in terms of frequency characteristics, as demonstrated in this article. The proposed structure based on Flame-Retardant fiber glass epoxy (FR4) substrate covered a wideband frequency range from 1.5 to 3.2 GHz, (IBW = 1.7 GHz) and from 3.4 to 3.65 GHz (IBW = 0.25 GHz). The total IBW is 1.95 GHz, at S11 ≤ −10 dB with three resonance frequencies of values <italic>fr1</italic> = 1.75, <italic>fr2</italic> = 2.65, and <italic>fr3</italic> = 3.50 GHz) for triple-band applications. The results are compared with the research work reported earlier. The proposed Ant.1 ensured, dual and triple band applications whereas the proposed Ant. 2 ensured dual, triple and quad bands applications with reasonable antennas' sizes similar to the earlier reported works. Furthermore, the impacts of various substrate materials as well as different lengths of multi-stub resonators on the operating bands and resonance frequency are thoroughly explored and analyzed for these antennas. </abstract>

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38

Qu, Longyue, Haiyan Piao, Yunhao Qu, Hyung‐Hoon Kim i Hyeongdong Kim. "Dual‐resonance‐based wideband antenna for integrated module applications". Electronics Letters 54, nr 8 (kwiecień 2018): 474–76. http://dx.doi.org/10.1049/el.2017.4458.

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Trampler, Michael E., Ricardo E. Lovato i Xun Gong. "Dual-Resonance Continuously Beam-Scanning X-Band Reflectarray Antenna". IEEE Transactions on Antennas and Propagation 68, nr 8 (sierpień 2020): 6080–87. http://dx.doi.org/10.1109/tap.2020.2989559.

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Yun, Xiaofan, Wenkui Lin, Rui Hu, Yizhang Liu, Dongmin Wu, Xinping Zhang, Zhongming Zeng i Baoshun Zhang. "Radiation-enhanced acoustically driven magnetoelectric antenna with floating potential architecture". Applied Physics Letters 121, nr 20 (14.11.2022): 203504. http://dx.doi.org/10.1063/5.0127422.

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A magnetoelectric (ME) antenna driven by a high-overtone bulk acoustic resonator (HBAR) can play a potentially positive role in the bandwidth enhancement benefit from its narrow harmonic frequency interval, in which radiation characteristics remain to be explored. HBAR ME antennas with floating potential architecture (FPA) and grounded are fabricated and demonstrated separately. The measured far-field radiation characteristics show that the FPA can significantly enhance the gain and radiation efficiency of the HBAR ME antenna by more than 10 dB compared to the grounded setup. Meanwhile, the time domain amplitude sweep demonstrates the high-power tolerance (>23.2 dBm) of the HBAR ME antenna. Two-dimensional finite element method analysis reveals that the FPA-induced electric field excites additional longitudinal-wave resonance, resulting in the coupling of dual longitudinal and shear waves, which is the intrinsic mechanism of its radiation enhancement from the perspective of acoustic excitation. Not only limited to HBAR antennas, the mechanism of FPA described here is also a promising candidate for radiation enhancement in acoustically driven antennas.

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Sung, Youngje. "Dual-Band Reconfigurable Antenna for Polarization Diversity". International Journal of Antennas and Propagation 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/6878607.

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This paper proposes a dual-band reconfigurable square-ring antenna with a polarization diversity property. The proposed antenna consists of a square-ring resonator, two stubs with a shorting via, and two PIN diodes. The stub is positioned symmetrically to the left and right of the square-ring resonator, and the square-ring antenna connected to one of two stubs has a dual-band resonance. In this case, both resonant frequencies exhibit linear polarization (LP), and the two polarized waves are perpendicular to each other. The PIN diode selectively connects only one of the two stubs to the square-ring resonator. Thus, the polarization of the proposed antenna changes electrically at the two resonant frequencies. In addition, the frequency ratio (f2/f1) can be easily controlled by changing the length or width of the stub.

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Dinh, Dang Nhu, Huynh Nguyen Bao Phuong, Dinh Thanh Liem, Hoang Phuong Chi i Dao Ngoc Chien. "NOVEL COMPACT DUAL-BROADBAND PLANAR METAMATERIAL ANTENNA". Vietnam Journal of Science and Technology 55, nr 3 (16.06.2017): 334. http://dx.doi.org/10.15625/2525-2518/55/3/8569.

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This paper proposes a novel uni-planar dual-band antenna using Composite Right Left Handed (CRLH) transmission line (CRLH-TL). Proposed antenna is designed based on the fringing effects of metamaterials and combined with coplanar waveguide (CPW) feeding in order to create two frequency bands for WLAN applications at the 2.4 and 5.5 GHz bands. Principle of gradual transform is applied to the antenna for extending the resonance frequency ranges. Optimized metamaterial antenna are fabricated and measured. Measurement results showed that the antenna operates in two broad frequency ranges spreading from 1.8 to 3.62 GHz and from 4.85 to 7.52 GHz with very compact overall dimensions of 18 mm × 16 mm (0,147 λ0 × 0.13λ0).

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Devi, Lanka Madhavi, C. Subbarao, Boppana Swathi Lakshmi i T. Sushma. "Multiple Slot Fractal Structured Antenna for Wi-Fi and Radio Altimeter for uncertain Applications". International Journal of Communication Networks and Information Security (IJCNIS) 14, nr 2 (14.10.2022): 01–14. http://dx.doi.org/10.17762/ijcnis.v14i2.5456.

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A multiple slot fractal antenna design has been determined communication efficiency and its multi-function activities. High-speed small communication devices have been required for future smart chip applications, so that researchers have been employed new and creative antenna design. Antennas are key part in communication systems, those are used to improve communication parameters like gain, efficiency, and bandwidth. Consistently, modern antennas design with high bandwidth and gain balancing is very difficult, therefore an adaptive antenna array chip design is required. In this research work a coaxial fed antenna with fractal geometry design has been implemented for Wi-Fi and Radio altimeter application. The fractal geometry has been taken with multiple numbers of slots in the radiating structure for uncertain applications. The coaxial feeding location has been selected based on the good impedance matching condition (50 Ohms). The overall dimension mentioned for antenna are approximately 50X50X1.6 mm on FR4 substrate and performance characteristic analysis is performed with change in substrate material presented in this work. Dual-band resonant frequency is being emitted by the antenna with resonance at 3.1 and 4.3 GHz for FR4 substrate material and change in the resonant bands is obtained with change in substrate. The proposed Antenna is prototyped on Anritsu VNA tool and presented the comparative analysis like VSWR 12%, reflection coefficient 9.4%,3D-Gain 6.2% and surface current 9.3% had been improved.

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Marandi, Arun Kumar, Gordhan Jethava, A. Rajesh, Sachin Gupta, Shrddha Sagar i Sonia Sharma. "Cognitive Computing for Multimodal Sentiment Sensing and Emotion Recognition Fusion Based on Machine Learning Techniques Implemented by Computer Interface System". International Journal of Communication Networks and Information Security (IJCNIS) 14, nr 2 (31.08.2022): 15–32. http://dx.doi.org/10.17762/ijcnis.v14i2.5462.

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A multiple slot fractal antenna design has been determined communication efficiency and its multi-function activities. High-speed small communication devices have been required for future smart chip applications, so that researchers have been employed new and creative antenna design. Antennas are key part in communication systems, those are used to improve communication parameters like gain, efficiency, and bandwidth. Consistently, modern antennas design with high bandwidth and gain balancing is very difficult, therefore an adaptive antenna array chip design is required. In this research work a coaxial fed antenna with fractal geometry design has been implemented for Wi-Fi and Radio altimeter application. The fractal geometry has been taken with multiple numbers of slots in the radiating structure for uncertain applications. The coaxial feeding location has been selected based on the good impedance matching condition (50 Ohms). The overall dimension mentioned for antenna are approximately 50X50X1.6 mm on FR4 substrate and performance characteristic analysis is performed with change in substrate material presented in this work. Dual-band resonant frequency is being emitted by the antenna with resonance at 3.1 and 4.3 GHz for FR4 substrate material and change in the resonant bands is obtained with change in substrate. The proposed Antenna is prototyped on Anritsu VNA tool and presented the comparative analysis like VSWR 12%, reflection coefficient 9.4%,3D-Gain 6.2% and surface current 9.3% had been improved.

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45

Kwon, Kyeol, Jaegeun Ha, Soonyong Lee i Jaehoon Choi. "Design of a Dual-Band On-Body Antenna for a Wireless Body Area Network Repeater System". International Journal of Antennas and Propagation 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/350797.

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A dual-band on-body antenna for a wireless body area network repeater system is proposed. The designed dual-band antenna has the maximum radiation directed toward the inside of the human body in the medical implantable communication service (MICS) band in order to collect vital information from the human body and directed toward the outside in the industrial, scientific, and medical (ISM) band to transmit that information to a monitoring system. In addition, the return loss property of the antenna is insensitive to human body effects by utilizing the epsilon negative zeroth-order resonance property.

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Li, Zhaozhan, Cheng Zhou i Yanhong Lin. "An Efficient, Wideband, CPW-Fed Antenna Based on Simplified Composite Right/Left-Handed Transmission Line". Frequenz 71, nr 1-2 (1.01.2017): 37–40. http://dx.doi.org/10.1515/freq-2016-0062.

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Abstract A wideband electrically small antenna (ESA) based on simplified composite right/left-handed transmission line (SCRLH-TL) is designed, fabricated and tested. The antenna consists of two different sized SCRLH-TL unit cells with different+1st-order mode resonance frequencies. The wideband property of antenna is achieved when these two+1st-order mode resonance frequency suitably merge. A dispersion analysis of the SCRLH-TL reveals that an increase in series of the dual-spiral capacitor would decrease the+1st-order mode resonance frequency, thus reducing the electrical size of the proposed antenna. The 10 dB fractional bandwidth (FBW10 dB) was 54.5 % and the measured maximum was 96.2 %, with an electrical size of 0.32λ0×0.16λ0×0.015λ0 at 3.0 GHz (where λ0 is the wavelength in vacuum). It is shown that the numerical results closely fit the measured results.

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Al-Ani, Nada M. Khalil, Oras A. Shareef Al-Ani, Mahmood F. Mosleh i Read A. Abd-Alhameed. "Design a CRLH Antenna for MIMO Applications with Single and Dual Band". Periodica Polytechnica Electrical Engineering and Computer Science 65, nr 3 (5.07.2021): 235–43. http://dx.doi.org/10.3311/ppee.16475.

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A design of MIMO antenna with four elements each one consists of two polarized ports is proposed in this research. The design of each elements based on ZORA which is applied to get the advantage of band frequency flexibility. The proposed MIMO antenna is operated as a single and dual band by adjusting a ground structure. The resonance frequency is 3.9 GHz for single band with bandwidth 1 GHz (3.4–4.4) GHz at -10 dB with −27 dB isolation. The resonance frequencies for dual band are 4.95 and 7 GHz with bandwidth 1.23 GHz (4.03–5.26) GHz and 410 MHz (6.88–7.29) GHz at −10 dB and less than −12 dB isolation for both bands. The obtained size of FR-4 PCB for single band is 77 × 150 mm2 while 82 × 150 mm2 for dual band which are suitable for future smartphone.

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48

Pandey, Akhilesh Kumar, i Rajeev Singh. "Dual Band Gap Coupled Patch Antenna for Wireless Communications". ECTI Transactions on Electrical Engineering, Electronics, and Communications 16, nr 1 (20.06.2017): 39–45. http://dx.doi.org/10.37936/ecti-eec.2018161.171323.

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A dual frequency resonance antenna is proposed by means of a rectangular microstrip patch antenna with parasitic elements. Analysis is made using concepts of circuit theory and the measured and theoretical results are compared with simulation results obtained with IE3D simulation software. Error between experimental and theoretical and simulated values is within 1.5% and frequency ratio of the simulated, theoretical and experimental values is found to be 2.0

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Rakesh, Kumar, i Kumar Ram. "Enhanced gain and compact size microstrip patch antenna by suppressing the surface waves". i-manager's Journal on Communication Engineering and Systems 11, nr 2 (2022): 11. http://dx.doi.org/10.26634/jcs.11.2.17289.

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In this paper, an enhanced gain and compact size microstrip patch antenna by suppressing the surface waves is presented for L band and S band applications. The surface waves are suppressed by using a heterogeneous substrate. A heterogeneous substrate is prepared by removing partially the substrate surrounding the patch. He suggested antenna works for a dual band resonance frequency. The first resonance frequency of the antenna is 1.585 GHz with a return loss of -17. 942 dB and second resonance frequency of the antenna is 2.335 GHz with - 13. 7785 dB return loss. The -10 dB impedance bandwidth of the antenna is 11.9 MHz (1.5809 - 1.55928 GHz) and 44.8 MHz (2.324 - 2.3469 GHz), which is the suitable bandwidth for Global Positioning Systems (GPS), WLAN and satellite communication. Compared to a standard patch antenna the suggested antenna has obtained a high gain of 7.99 dBi with reduced size up to 34% of a defected ground structure (DGS) on a a heterogeneous substrate. Using HFSS, the performance of patch antenna with DGS on a heterogeneous substrate are compared with a homogeneous substrate, a homogeneous substrate with DGS and without DGS on a heterogeneous substrate.

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Hamad, Ehab K. I., i Ahmed Abdelaziz. "Metamaterial superstrate microstrip patch antenna for 5G wireless communication based on the theory of characteristic modes". Journal of Electrical Engineering 70, nr 3 (1.06.2019): 187–97. http://dx.doi.org/10.2478/jee-2019-0027.

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Abstract Metamaterials (MTMs) have received considerable attention due to their novel electromagnetic properties. Their applications include enhancing gain and bandwidth in microstrip antennas. In this article, a dual band microstrip antenna design based on characteristic mode analysis (CMA) using MTM superstrate is proposed for 5G wireless communication. The CMA is used for the modelling, analysis and optimization of the proposed antenna to examine the underlying modal behaviour of the MTM unit cell and to guide mode excitation. The antenna structure consists of a microstrip feed line connected to a rectangular patch. Then triangular split ring resonator unit cell is inserted on the ground of a traditional patch antenna that resonates at 15 GHz to produce additional resonance at 10 GHz. A planar array of 2 × 3 triangle MTM unit cells is used as superstrate to improve the gain and bandwidth at both resonances simultaneously. The optimal distance between MTM superstrate and the antenna patch is determined using the Fabry-Perot cavity theory to maximize power directivity and efficiency of the proposed antenna. The CST microwave studio software is used to model and optimize the proposed antenna. A prototype of the designed antenna that was fabricated showed good agreement between measurement and simulation results.

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Artykuły w czasopismach na temat „DUAL-RESONANCE ANTENNA”

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