Journal articles: 'Wideband'

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M, Harinath. "Ultra-Wideband Communication." International Journal of Research Publication and Reviews 4, no. 4 (April 8, 2023): 1900–1902. http://dx.doi.org/10.55248/gengpi.2023.4.4.35861.

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Wen Liu, Dong, and Daniel Msilanga. "Wideband Notched Rectangular DRA." International Journal of Science and Research (IJSR) 7, no. 5 (May 5, 2018): 41–43. http://dx.doi.org/10.21275/art20182075.

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Chang, Jaewon, Junil Ahn, Jeungmin Joo, and Dongweon Lee. "Development of Wideband Multi-Channel Receiver for Direction Finding of Communication Signals." Journal of the Korea Institute of Military Science and Technology 24, no. 5 (October 5, 2021): 527–36. http://dx.doi.org/10.9766/kimst.2021.24.5.527.

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In wireless environments, wideband receivers are used in a communication intelligent system to detect unknown signals and obtain azimuth information. To design a wideband receiver that performs multiple signal detection and direction finding simultaneously, it is necessary to consider a reception structure composed of multiple channels. In this paper, we propose a wideband multi-channel receiver for direction finding of unknown wideband communication signals including frequency hopping signals. A signal processing method for detecting received signals and estimating azimuth information is presented, and components of the manufactured wideband receiver are described. In addition, test results of the signal detection performance by mounting the proposed wideband multi-channel receiver on the flight system are included.

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Biswas, Anirban, and Nilotpal Dutta. "Wideband Tympanometry." Annals of Otology and Neurotology 01, no. 02 (September 2018): 126–32. http://dx.doi.org/10.1055/s-0038-1676876.

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AbstractTraditional tympanometry done with 226 Hz probe tone frequency has some inherent defects and limitations due to which it does not give a very true picture of the middle ear status, and tympanometric findings are often very deceptive. It is not uncommon for otologists to find that on opening the middle ear, the pathology in the middle ear is very different from what they had expected from tympanometric findings. This is because the 226 or 220 Hz, that is used for the traditional single tone tympanometry is based on physical convenience, i.e., practicalities in carrying out the test rather than on test performance, i.e., the diagnostic efficacy of the test. The 226 Hz tympanometry is a poor predictor of middle ear effusions in babies and will be wrong in approximately 50% of cases and diagnosis of ossicular chain discontinuity by type A tympanogram is correct in only about 40% cases, if not lesser. In most cases of otosclerosis, though there is a middle ear stiffness, the tympanometric findings with traditional tympanometry show normal compliance, which is not expected in stiffness of the middle ear. Tympanometry is basically to identify common middle ear pathologies, such as middle ear effusion, ossicular chain discontinuity and otosclerosis. However, if in these very cases the diagnostic efficacy is so poor, then the objective of the test is lost. Traditional tympanometry has a lot of limitations and fallacies. These issues led scientists to sharpen the diagnostic efficacy of tympanometry and the final outcome of the research is wide band tympanometry (WBT). The special advantages of WBT, its difference from traditional single frequency tympanometry, and its clinical utility are presented in this article. Here, we review the concept of WBT, the basic mechanism, and its vast clinical applications. Most of the deficiencies of traditional tympanometry have been overcome by WBT. Not only that, the scope of tympanometry has been further widened by WBT and in addition to diagnosing middle ear pathologies with much more confidence, it can also be used for postoperative monitoring using non-pressurized wideband absorbance.

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Jabbari, B. "Wideband CDMA." IEEE Communications Magazine 36, no. 9 (September 1998): 46. http://dx.doi.org/10.1109/mcom.1998.714614.

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Wang, Yanwei, Jian Li, Petre Stoica, Mark Sheplak, and Toshikazu Nishida. "Wideband RELAX and wideband CLEAN for aeroacoustic imaging." Journal of the Acoustical Society of America 115, no. 2 (February 2004): 757–67. http://dx.doi.org/10.1121/1.1639906.

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S., Karthie, and Salivahanan S. "Fractal-based triangular bandpass filter with a notched band for interference rejection in wideband applications." Circuit World 45, no. 3 (August 5, 2019): 141–47. http://dx.doi.org/10.1108/cw-06-2018-0045.

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Purpose This paper aims to present the design of a novel triangular-shaped wideband microstrip bandpass filter implemented on a low-cost substrate with a notched band for interference rejection. Design/methodology/approach The conventional dual-stub filter is embedded with simple fractal-based triangular-circular geometries through various iterations to reject wireless local area network (WLAN) signals with a notched band at 5.8 GHz. Findings The filter covers a wide frequency band from 3.1 to 8.8 GHz and has a fractional bandwidth of 98 per cent with the lower passband of 57.5 per cent and upper passband of 31.6 per cent separated by a notched band at 5.8 GHz. The proposed wideband prototype bandpass filter is fabricated in FR-4 substrate using PCB technology and the simulation results are validated with measurement results which include insertion loss, return loss and group delay. The fabricated filter has a sharp rejection of 28.3 dB at 5.8 GHz. Measured results show good agreement with simulated responses. The performance of the fractal-based wideband filter is compared with other wideband bandpass filters. Originality/value In the proposed work, a fractal-based wideband bandpass filter with a notched band is reported. The conventional dual-stub filter is deployed with triangular-circular geometry to design a wideband filter with a notched band to suppress interference signals at WLAN frequency. The proposed wideband filter exhibits smaller size and better interference rejection compared to other wideband bandpass filter designs implemented on low-cost substrate reported in the literature. The aforementioned wideband filter finds application in wideband wireless communication systems.

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SIBUL, L. H., L. G. WEISS, and T. L. DIXON. "CHARACTERIZATION OF STOCHASTIC PROPAGATION AND SCATTERING VIA GABOR AND WAVELET TRANSFORMS." Journal of Computational Acoustics 02, no. 03 (September 1994): 345–69. http://dx.doi.org/10.1142/s0218396x94000221.

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An application to remote acoustic sensing that remains unexploited is measuring acoustic scattering and spreading effects with wideband, coherent signal processing techniques. Such techniques allow distributed objects, such as a layer of scatterers due to bubbles or biological particles, and first order time variations in an ocean channel to be estimated. This paper presents narrowband and wideband methods for characterizing stochastic propagation and acoustic scattering in a time-varying ocean in terms of spreading functions. It is shown that the Gabor transform is the natural transform for estimating the narrowband spreading function, and the wavelet transform is the natural transform for estimating the wideband spreading function. Both techniques of characterization use a correlator processing structure in a monostatic transmitter/receiver configuration to estimate the spreading function. The narrowband and wideband spreading functions characterize the distribution of scatterers in range and velocity (time and frequency) in a propagation channel. It is shown that the wideband formulation follows directly from a physical derivation. Moreover, wideband processing removes many of the narrowband restrictions and allows first order time variations, caused by inhomogeneities and relative motion in the ocean channel, to be processed. In addition, wideband techniques allow for increased time intervals and, therefore, increased energy transmission when the transmitter is peak-power-limited. Thus, weak scatterers that may have been unidentified with narrowband techniques may be identified with the wideband methods. Numerical examples for wideband characterization of a distributed scatterer are presented.

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Yu, Daqun, Zhangcheng Hao, Lei Yang, Yang Wang, Lei Sun, and Jianjun Mao. "A Low-Cost Wideband Digital Array Antenna Based on Stretch Processing Technique." International Journal of Antennas and Propagation 2024 (April 24, 2024): 1–14. http://dx.doi.org/10.1155/2024/3624117.

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Wideband digital phased array radar offers the advantages of high range resolution, which improves the recognition ability for multiple targets, group targets, and high-speed targets. Traditional wideband phased arrays use true time delay to compensate for aperture fill time; however, the cost increases significantly. In this paper, a wideband elemental digital array architecture based on the stretch processing method is proposed. By utilizing the time-domain and frequency-domain translation equivalence of the LFM (Linear Frequency Modulation) signal waveform, the equivalent aperture fill time is compensated for through frequency shift and phase shift after stretch processing. Compared to traditional wideband digital arrays, this method can dramatically reduce the required sampling rate and lower the requirements on antenna hardware, thereby reducing the manufacturing cost of system. A comprehensive analysis of the signal processing process and stretch processing method is provided. And an antenna array prototype is developed to verify the T/R channel compensation and wideband beamforming. Measured results show that the antenna is capable of ±60° scanning in azimuth plane and ±40° scanning in elevation plane, with a bandwidth of 500 MHz in S-band. The results demonstrate excellent wideband beam performance and accurate lobe scanning, which confirms the validity of the proposed wideband architecture for stretch processing, frequency shift, and phase shift. This method can be widely applied to the low-cost design and wideband performance improvement of wideband digital array radar.

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Wu, Xun, Jie Luo, Guowei Li, Shurui Zhang, and Weixing Sheng. "Fast Wideband Beamforming Using Convolutional Neural Network." Remote Sensing 15, no. 3 (January 25, 2023): 712. http://dx.doi.org/10.3390/rs15030712.

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With the wideband beamforming approaches, the synthetic aperture radar (SAR) could achieve high azimuth resolution and wide swath. However, the performance of conventional adaptive wideband time-domain beamforming is severely affected as the received signal snapshots are insufficient for adaptive approaches. In this paper, a wideband beamformer using convolutional neural network (CNN) method, namely, frequency constraint wideband beamforming prediction network (WBPNet), is proposed to obtain a satisfactory performance in the circumstances of scanty snapshots. The proposed WBPNet successfully estimates the direction of arrival of interference with scanty snapshots and obtains the optimal weights with effectively null for the interference by utilizing the uniqueness of CNN to extract potential nonlinear features of input information. Meanwhile, the novel beamformer has an undistorted response to the wideband signal of interest. Compared with the conventional time-domain wideband beamforming algorithm, the proposed method can fast obtain adaptive weights because of using few snapshots. Moreover, the proposed WBPNet has a satisfactory performance on wideband beamforming with low computational complexity because it avoids the inverse operation of covariance matrix. Simulation results show the meliority and feasibility of the proposed approach.

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Zeain, Mohammed Yousif, M. Abu, Z. Zakaria, Ahmed Jamal Abdullah Al-Gburi, R. Syahputri, A. Toding, and Sriyanto Sriyanto. "Design of a wideband strip helical antenna for 5G applications." Bulletin of Electrical Engineering and Informatics 9, no. 5 (October 1, 2020): 1958–63. http://dx.doi.org/10.11591/eei.v9i5.2055.

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This paper presents the design of wideband strip helical antenna for 5G Application. The strip helical antenna is designed for 5G and wideband applications that provide a wide bandwidth and circular polarization. The helical antenna is planned on at 5.8 GHz frequency by using Teflon material. The new designed strip is printed on a substrate then rolled into a helix shape to achieve circular polarization without an impedance matching and that the proposed antenna can be used for potential applications in wideband wireless communication. A wideband bandwidth of 2.41 GHz with a resonant frequency at 5.8 GHz is achieved by the helical antenna on the Teflon substrate. The presented antenna on Teflon substrate has achieved a gain of 11.2 dB. The antenna design parameters and the simulated results are achieved using the commercial software CST. The proposed antenna can be used for various wireless applications such as Wideband, Ultra wideband, 5G and wireless Applications.

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Qiu, Lei-Lei, and Lei Zhu. "Wideband bandstop filters based on wideband 180° phase shifters." IET Microwaves, Antennas & Propagation 14, no. 13 (October 28, 2020): 1662–70. http://dx.doi.org/10.1049/iet-map.2020.0181.

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Kim, Minseok, Wooseok Lee, Jongseok Bae, Hwiseob Lee, Keum Cheol Hwang, Kang-Yoon Lee, Cheon-seok Park, and Youngoo Yang. "Balanced\/Unbalanced Wideband: A Wideband, Bifilar Transmission-Line Balun." IEEE Microwave Magazine 17, no. 1 (January 2016): 65–69. http://dx.doi.org/10.1109/mmm.2015.2487921.

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Palaniswamy, Sandeep Kumar, Malathi Kanagasabai, Shrivastav Arun Kumar, M. Gulam Nabi Alsath, Sangeetha Velan, and Jayaram Kizhekke Pakkathillam. "Super wideband printed monopole antenna for ultra wideband applications." International Journal of Microwave and Wireless Technologies 9, no. 1 (May 28, 2015): 133–41. http://dx.doi.org/10.1017/s1759078715000951.

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This paper presents the design, testing, and analysis of a clover structured monopole antenna for super wideband applications. The proposed antenna has a wide impedance bandwidth (−10 dB bandwidth) from 1.9 GHz to frequency over 30 GHz. The clover shaped antenna with a compact size of 50 mm × 45 mm is designed and fabricated on an FR4 substrate with a thickness of 1.6 mm. Parametric study has been performed by varying the parameters of the clover to obtain an optimum wide band characteristics. Furthermore, the prototype introduces a method of achieving super wide bandwidth by deploying fusion of elliptical patch geometries (clover shaped) with a semi elliptical ground plane, loaded with a V-cut at the ground. The proposed antenna has a 14 dB bandwidth from 5.9 to 13.1 GHz, which is suitable for ultra wideband (UWB) outdoor propagation. The prototype is experimentally validated for frequencies within and greater than UWB. Transfer function, impulse response, and group delay has been plotted in order to address the time domain characteristics of the proposed antenna with fidelity factor values. The possible applications cover wireless local area network, C-band, Ku-band, K-band operations, Worldwide Interoperability for Microwave Access, and Wireless USB.

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Yang, Tianhao, Qiming Ma, and Tuo Chen. "Comparison of Passive Sonar Narrowband Detection and Wideband Detection Performance." Journal of Innovation and Social Science Research 8, no. 8 (August 30, 2021): 27–29. http://dx.doi.org/10.53469/jissr.2021.08(08).08.

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Conventional passive sonar uses wideband beam energy for target detection. In the case of low signal-to-noise ratio and strong target interference, the performance of wideband energy detection is rapidly degraded. In view of the relatively stable line spectrum of the radiated noise of underwater targets, the performance of narrowband detection and wideband detection is considered. In stable line spectrum underwater target detection, narrowband detection has performance advantages over wideband detection. However, its actual performance has disadvantages such as sensitivity to noise frequency bands. In this paper, based on the sonar equation, the theoretical methods of wideband detection and narrowband detection are analyzed and the main factors affecting detection performance are given. Simulation and sea trial data processing results verify the effectiveness of the method.

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Huang, Qiulin, Feng Wei, Lihua Yuan, Hongxing Zhou, and Xiaowei Shi. "A New Wideband Mutual Coupling Compensation Method for Adaptive Arrays Based on Element Pattern Reconstruction." International Journal of Antennas and Propagation 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/386920.

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A new mutual coupling compensation method for wideband adaptive arrays is proposed. The new method is developed by combining the element pattern reconstruction method and the system identification method. The element pattern reconstruction method is valid and effective in the mutual coupling compensation for adaptive arrays such as dipole arrays and microstrip arrays. Each entry of the wideband compensation matrix is represented as an analytical expression against frequency. The polynomial coefficients and orders of all entries are obtained via the system identification method. The new wideband compensation method is characterized by the good adaptability of element structures and polarizations owing to the advantages of element pattern reconstruction method. A wideband microstrip array is designed to test the validity and effectiveness of the wideband compensation method.

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Dissanayake, Nadeeshan, Chamira U. S. Edussooriya, Chamith Wijenayake, and Arjuna Madanayake. "Multibeam Wideband Transmit Beamforming Using 2D Sparse FIR Trapezoidal Filters." Journal of Low Power Electronics and Applications 14, no. 2 (April 28, 2024): 26. http://dx.doi.org/10.3390/jlpea14020026.

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A low-complexity multibeam wideband transmit beamformer using a 2D sparse FIR filter design capable of multiple beams is proposed as a digital building block for fully digital beamformers. The 2D sparse FIR filter has multiple trapezoid-shaped passbands pertaining to wideband beams aimed at particular directions. The proposed multibeam digital beamformer drives a uniform linear array of wideband antenna elements to achieve the wideband multibeam transmit-mode signals desired by the communication system. The 2D sparse FIR filter is designed to be optimal in the minimax sense using convex optimization techniques. Full-wave electromagnetic simulations using real antenna models confirm that the proposed wideband transmit beamformer can achieve multibeam transmission in the 1.3–2.8 GHz frequency range, with more than 70% fractional bandwidth. Furthermore, the adoption of the wideband transmit multibeam beamformer leads to a significant reduction in digital arithmetic (computational) complexity compared with previously reported wideband transmit beamformers of similar transfer function type, without deteriorating beam directionality and causing increases in the side-lobe level. The proposed sparse 2D FIR multibeam beamformer architecture is well-suited for both sub-6 GHz (legacy) band transmit beamforming, frequency range three (FR3) beamforming up to 28 GHz, and mmWave operation for emerging 5G/6G applications.

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Li, Li. "Cramer-Rao Bound for Parameter Estimation in Bistatic MIMO Radar." Applied Mechanics and Materials 513-517 (February 2014): 3385–88. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.3385.

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The problem of Cramér-Rao bound for parameter estimation in wideband bistatic Multiple-Input Multiple-Output (MIMO) radar system is considered. In many applications, it is not appropriate to approximate the wideband signal by the narrowband model. In this paper, we propose a new wideband signal model to accurately estimate parameter for wideband signals from a moving target. The Cramér-Rao bound for target parameter estimation is derived and computed in closed form which shows that the optimal performance is achieved. Target location and parameter estimation performances are evaluated and studied theoretically and via simulations.

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Pokrajac, Ivan, and Desimir Vucic. "Wideband cyclic music algorithms: A frequency-domain approach." Facta universitatis - series: Electronics and Energetics 23, no. 3 (2010): 367–78. http://dx.doi.org/10.2298/fuee1003367p.

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In this paper, we propose two spectral cyclic MUSIC DOA estimation algorithms for wideband cyclostationary signals: the wideband spectral cyclic conjugateMUSIC (WSCCM) algorithm and the extended wideband spectral cyclicMUSIC (EWSCM) algorithm. The proposed algorithms can be applied to estimate the spectral cyclic conjugate correlation matrix and the extended spectral cyclic correlation matrix of wideband cyclostationary signals. The presented algorithms do not require any knowledge of the optimal time lag parameter, which appears in the similar algorithms in time domain. In the proposed algorithms, the DOAs are estimated at each spectral component of the selected frequency band for a cyclic frequency of interest. This can be used to form the azimuth cyclic frequency diagram, similar to the azimuth frequency diagram in wideband direction-finding systems. Some simulation results are provided to confirm the theoretical findings.

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Wei, Hong Kai, Ping Bo Wang, Jing Xiang Yin, and Chun Lei Zhang. "Research on the Performance of Sub-Band STAP for Wideband Interference Suppression." Advanced Materials Research 756-759 (September 2013): 1724–28. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.1724.

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Sub-band space-time adaptive processing (STAP), which decomposes the wideband signal using sub-band filter bank, is the common intuitive way to suppress wideband interference. Based on studying angel-frequency distribution characteristics of wideband, sub-band interference and echo signal in space-time plane, the paper gives the physical significance of sub-band interference and echo signals space-time distribution and thus reveals theoretically the fundamental reason for the poor performance of sub-band STAP. Furthermore, the paper outlines the novel way for wideband linear frequency modulation (LFM) interference cancellation in the three-dimensional space-fractional Fourier domain.

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Mohd Zali, Hanisah, Mohd Khairil Adzhar Mahmood, Idnin Pasya, Miyuki Hirose, and Nurulazlina Ramli. "Narrowband and wideband EMW path loss in underwater wireless sensor network." Sensor Review 42, no. 1 (November 17, 2021): 125–32. http://dx.doi.org/10.1108/sr-04-2021-0128.

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Purpose Utilization of electromagnetic wave (EMW) sensors in an underwater environment has the potential to increase the data rate compared to acoustic-based sensors because of the ability to use larger signal bandwidth. Nevertheless, EMW signals has the drawback of large signal attenuation in underwater, attributed to the high relative permittivity and conductivity of water compared to the atmosphere, hence employment of wide signal bandwidth is necessary to balance the data rate-attenuation trade-off. The purpose of this paper is to analyze the characteristics of both narrowband and wideband EMW signal propagation underwater and devise a path loss model for both cases. Design/methodology/approach Path loss measurement was conducted using a point-to-point configuration in a laboratory water tank while transmitting narrowband and wideband signals between a pair of wideband underwater antennas. The wideband underwater antennas use buffer-layer structures as the impedance matching layer to optimize the antenna performance when operating underwater. The path loss for narrowband signal was modeled using a multi-layer propagation equation in lossy medium considering losses at the medium boundaries. For the case of the wideband signal, a modified version of the model introducing power integration over bandwidth is adopted. These models were formulated through numerical simulations and verified by measurements. Findings The measured narrowband path loss marked an 80 dB attenuation using 800 MHz at 2 m distance. The proposed narrowband model agrees well with the measurements, with approximately 3 dB modeling error. Utilization of the proposed wideband path loss model resulted in a reduction of the gradient of the path loss curve compared to the case of the narrowband signal. The measured wideband path loss at 2 m distance underwater was approximately −65 dB, which has been shown to enable a working signal-to-noise ratio of 15 dB. This proves the potential of realizing high data rate transmission using the wideband signal. Originality/value The paper proposed a wideband propagation model for an underwater EMW sensor network, using power integration over bandwidth. The effectiveness of using wideband EMW signals in reducing path loss is highlighted, which is seldom discussed in the literature. This result will be of useful reference for using wideband signals in designing a high data rate transmission system in underwater wireless sensor networks, for example, in link budget, performance estimation and parameter design of suitable transmission scheme.

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McCreery, Ryan W., Anastasia Grindle, Gabrielle R. Merchant, Jeffery Crukley, and Elizabeth A. Walker. "Predicting wideband real-ear-to-coupler differences in children using wideband acoustic immittance." Journal of the Acoustical Society of America 154, no. 2 (August 1, 2023): 991–1002. http://dx.doi.org/10.1121/10.0020660.

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Individual differences in ear-canal acoustics introduce variability into hearing aid output that can affect speech audibility. Measuring ear-canal acoustics in young children can be challenging, and relying on normative real-ear-to-coupler difference (RECD) transforms can lead to large fitting errors. Acoustic immittance measures characterize the impedance of the ear and are more easily measured than RECD. Using 226 Hz tympanometry to predict the RECD is more accurate than using age-based average RECD values. The current study sought to determine whether wideband acoustic immittance measurements could improve predictions of wideband real-ear-to-coupler difference (wRECD). 150 children ages 2–10 years with intact tympanic membranes underwent wRECD and wideband acoustic immittance measures in each ear. Three models were constructed to predict each child's measured wRECD: the age-based average wRECD, 226 Hz admittance wRECD, and wideband absorbance wRECD. The average age-based wRECD model predicted the child's measured wRECD within 3 dB in 62% of cases, but both the 226 Hz admittance and wideband absorbance wRECD were within 3 dB in 90% of cases. Using individual 226 Hz or wideband absorbance to predict wRECD improved the accuracy and precision of transforms used for pediatric hearing aid fitting.

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Galajda, Pavol, Alena Galajdova, Stanislav Slovak, Martin Pecovsky, Milos Drutarovsky, Marek Sukop, and Ihab BA Samaneh. "Robot vision ultra-wideband wireless sensor in non-cooperative industrial environments." International Journal of Advanced Robotic Systems 15, no. 4 (July 1, 2018): 172988141879576. http://dx.doi.org/10.1177/1729881418795767.

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In this article, the ultra-wideband technology for localization and tracking of the robot gripper (behind the obstacles) in industrial environments is presented. We explore the possibilities of ultra-wideband radar sensor network employing the centralized data fusion method that can significantly improve tracking capabilities in a complex environment. In this article, we present ultra-wideband radar sensor network hardware demonstrator that uses a new wireless ultra-wideband sensor with an embedded controller to detect and track online or off-line movement of the robot gripper. This sensor uses M-sequence ultra-wideband radars front-end and low-cost powerful processors on a system on chip with the advanced RISC machines (ARM) architecture as a main signal processing block. The ARM-based single board computer ODROID-XU4 platform used in our ultra-wideband sensor can provide processing power for the preprocessing of received raw radar signals, algorithms for detection and estimation of target’s coordinates, and finally, compression of data sent to the data fusion center. Data streams of compressed target coordinates are sent from each sensor node to the data fusion center in the central node using standard the wireless local area network (WLAN) interface that is the feature of the ODROID-XU4 platform. The article contains experimental results from measurements where sensors and antennas are located behind the wall or opaque material. Experimental testing confirmed capability of real-time performance of developed ultra-wideband radar sensor network hardware and acceptable precision of software. The introduced modular architecture of ultra-wideband radar sensor network can be used for fast development and testing of new real-time localization and tracking applications in industrial environments.

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Wang, Wu, Yao, and Qin. "Wideband Spectrum Sensing Method Based on Channels Clustering and Hidden Markov Model Prediction." Information 10, no. 11 (October 25, 2019): 331. http://dx.doi.org/10.3390/info10110331.

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Spectrum sensing is the necessary premise for implementing cognitive radio technology. The conventional wideband spectrum sensing methods mainly work with sweeping frequency and still face major challenges in performance and efficiency. This paper introduces a new wideband spectrum sensing method based on channels clustering and prediction. This method counts on the division of the wideband spectrum into uniform sub-channels, and employs a density-based clustering algorithm called Ordering Points to Identify Clustering Structure (OPTICS) to cluster the channels in view of the correlation between the channels. The detection channel (DC) is selected and detected for each cluster, and states of other channels (estimated channels, ECs) in the cluster are then predicted with Hidden Markov Model (HMM), so that all channels states of the wideband spectrum are finally obtained. The simulation results show that the proposed method could effectively improve the wideband spectrum sensing performance.

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Bhayana, Ekta, Dr Svav Prasad, Parikshit Vasisht*, Moin Uddin, Taruna Sharma, and Sudhakar Ranjan. "A Novel Wideband RDRA for WBAN Applications." International Journal of Engineering and Advanced Technology 10, no. 4 (April 30, 2021): 171–74. http://dx.doi.org/10.35940/ijeat.d2431.0410421.

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A Wideband Rectangular Dielectric Resonator Antenna (RDRA) is presented in this manuscript. The proposed RDRA is designed for wideband body area network (WBAN) applications due to its compact size and wideband characteristics. The proposed antenna can be effectively integrated with modern medical devices for transmitting biological signals. WBAN attract variety of applications in monitoring human health in the domains such as sports, entertainment, defense, and healthcare industry. This manuscript presents a novel RDRA to meet recent research challenges as well as applications for future generation wideband RF-device technology for BANs. The miniaturized RDRA Antenna is designed for biotelemetry using HFSS 13, FEM based 3D EM Simulation Software.

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Yin, Ya Fang, Long Hui Duan, and Yan Na Liao. "Design of Micro-Wideband Radar Experiment System." Advanced Materials Research 588-589 (November 2012): 902–5. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.902.

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This paper presents a micro-wideband radar experimental system design. Wideband signal source and high-speed data sampling and processing module of the system is discussed in detail. Designed radar experimental system weighs 4.5Kg, with signal bandwidth of 1GHz and effective distance of 5km. The system can realize wideband radar echo real-time sampling and processing functions. On-board Synthetic Aperture Radar (SAR) imaging experiment is done. The imaging resolution of the system is 0.3m, this result is satisfactory. It shows that the system can meet the requirements of a unmanned aerial vehicles (UAV) platform. The design and test results are significant to miniaturization of wideband radar system.

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Seyyedesfahlan, Mehdi, Abdulkadir Uzun, Anja K. K. Skrivervik, and Ibrahim Tekin. "Wideband Multiport Antennas." Sensors 20, no. 23 (December 5, 2020): 6960. http://dx.doi.org/10.3390/s20236960.

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In this paper, a wideband four port 2–6 GHz antenna is proposed. One-, two-, and four-port antennas are implemented and characterized between 2 and 6 GHz. The isolation between the ports is improved by connecting and optimizing the ground plane sections. The results show that the antennas’ reflection coefficients are better than 10 dB in the frequency band. The measured isolation between the ports is greater than 15 dB (between 2.3 and 6 GHz) and 10 dB in the whole band for two- and four-port antennas, respectively, however, it is more than 20 dB around 2.4 and 5–6 GHz for both antennas. The calculated correlation coefficient between ports is below −30 dB (>2.14 GHz) and −15 dB for the two- and four-port antennas, respectively. The measured gain and efficiency scale are 3.1–6.75 dBi and 62–98%, respectively. To the best of our knowledge, an antenna both being wideband from 2 to 6 GHz and having independent four ports is only addressed in this work. The four-port antenna can be used for MIMO systems or smartphones operating on many wireless systems simultaneously such as 3G/4G/5G Sub-6 GHz and WLAN including the next generation WiFi7 with full-duplex operation.

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Abbosh, Amin. "Ultra Wideband Antennas." Recent Patents on Electrical Engineeringe 1, no. 2 (June 1, 2008): 136–45. http://dx.doi.org/10.2174/1874476110801020136.

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Belyaev, B. A., S. A. Khodenkov, I. V. Govorun, and A. M. Serzhantov. "Wideband Microstrip Filters." Technical Physics Letters 47, no. 4 (April 2021): 321–25. http://dx.doi.org/10.1134/s1063785021040039.

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30

Voytovich, N. I., and A. V. Ershov. "Wideband Dipole Antenna." Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics 16, no. 1 (2016): 31–42. http://dx.doi.org/10.14529/ctcr160103.

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31

Katz, Allen, Robert Gray, and Roger Dorval. "Truly wideband linearization." IEEE Microwave Magazine 10, no. 7 (December 2009): 20–27. http://dx.doi.org/10.1109/mmm.2009.934688.

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32

Sanford, Chris A., Lisa L. Hunter, M. Patrick Feeney, and Hideko Heidi Nakajima. "Wideband Acoustic Immittance." Ear and Hearing 34 (July 2013): 65s—71s. http://dx.doi.org/10.1097/aud.0b013e31829c7250.

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Feeney, Patrick. "Wideband Energy Reflectance." ASHA Leader 10, no. 5 (April 2005): 6–25. http://dx.doi.org/10.1044/leader.ftr4.10052005.6.

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34

Kim, Chun‐Duck, and Jong‐Rak Yoon. "Wideband array transducer." Journal of the Acoustical Society of America 96, no. 5 (November 1994): 3319. http://dx.doi.org/10.1121/1.410759.

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35

Stroh, S. "Wideband: multimedia unplugged." IEEE Spectrum 40, no. 9 (September 2003): 23–27. http://dx.doi.org/10.1109/mspec.2003.1228004.

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Whyte, C. G., K. Ronald, A. R. Young, W. He, C. W. Robertson, D. H. Rowlands, and A. W. Cross. "Wideband Gyro-Amplifiers." IEEE Transactions on Plasma Science 40, no. 5 (May 2012): 1303–10. http://dx.doi.org/10.1109/tps.2012.2190271.

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Yazdandoost, K. Y., and R. Kohno. "Ultra wideband antenna." IEEE Communications Magazine 42, no. 6 (June 2004): S29—S32. http://dx.doi.org/10.1109/mcom.2004.1304230.

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Becker, James, Dejan Filipovic, Hans Schantz, and Seong-Youp Suh. "Ultra-Wideband Antennas." International Journal of Antennas and Propagation 2008 (2008): 1–2. http://dx.doi.org/10.1155/2008/731247.

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39

Dey, Supriyo, C. K. Aanandan, K. A. Jose, P. Mohanan, and K. G. Nair. "Wideband microstrip dipole." Microwave and Optical Technology Letters 5, no. 13 (December 1992): 709–12. http://dx.doi.org/10.1002/mop.4650051317.

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KOBAYASHI, Takehiko, and Miyuki HIROSE. "Wideband and Ultra Wideband Radio Propagation in Heavy Multipath Environments." IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E98.A, no. 2 (2015): 511–19. http://dx.doi.org/10.1587/transfun.e98.a.511.

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41

Sam, Kollannore Ukkuru, and Parambil Abdulla. "TRUNCATED CIRCULAR MICROSTRIP ULTRA WIDEBAND ANTENNA EXHIBITING WIDEBAND CIRCULAR POLARIZATION." Progress In Electromagnetics Research C 99 (2020): 111–22. http://dx.doi.org/10.2528/pierc19112803.

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42

Park, Chee-Sung, and Shashank Priya. "Broadband/Wideband Magnetoelectric Response." Advances in Condensed Matter Physics 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/323165.

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A broadband/wideband magnetoelectric (ME) composite offers new opportunities for sensing wide ranges of both DC and AC magnetic fields. The broadband/wideband behavior is characterized by flat ME response over a given AC frequency range and DC magnetic bias. The structure proposed in this study operates in the longitudinal-transversal (L-T) mode. In this paper, we provide information on (i) how to design broadband/wideband ME sensors and (ii) how to control the magnitude of ME response over a desired frequency and DC bias regime. A systematic study was conducted to identify the factors affecting the broadband/wideband behavior by developing experimental models and validating them against the predictions made through finite element modeling. A working prototype of the sensor with flat bands for both DC and AC magnetic field conditions was successfully obtained. These results are quite promising for practical applications such as current probe, low-frequency magnetic field sensing, and ME energy harvester.

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43

Dvornikov, S. V., A. V. Pshenichnikov, S. S. Dvornikov, V. V. Borisov, and G. S. Potapov. "Ultra-wideband ultra-short pulse communication system." Radio industry (Russia) 31, no. 1 (April 7, 2021): 16–27. http://dx.doi.org/10.21778/2413-9599-2021-31-1-16-27.

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Problem statement. The development and design of radio communication systems with enhanced structural and energy stealth properties are of the greatest interest in modern radio engineering. One method of implementing such radio systems is the use of ultra-wideband signals. Despite advances in radio engineering theory, the development and design of ultra-wideband radio systems are at the initial stage. The results obtained in this subject area are not systematized, limiting their practical application and indicating the relevance of the chosen research problem.The study's objective is to formalize an approach to the design and performance assessment of ultra-wideband radio systems based on statistical radio engineering methods. Bringing the obtained theoretical solutions to the level of practical implementation in a radio station layout.Results. The analysis of available theoretical and practical solutions in the subject area of ultra-wideband radio systems is carried out. The principles of development and evaluation taking into account the characteristics of radio equipment elements are justified. A model of an ultra-wideband radio pulse is presented. The requirements of guiding documents are summarized, based on which the requirements for radio equipment are clarified. The criteria for the formation and processing of ultra-wideband signals are determined. An approach to controlling the parameters of the applied signals is considered. The criterion of increasing the efficiency of radio systems is justified. An approach to calculating the size of the pulse packs defining the signal symbols is developed. Analytical calculations are presented following the developed approach.Practical implications. The authors developed a model of an ultra-wideband radio station based on LLC Scientific Production Enterprise "New Telecommunications Technologies". The obtained practical solutions can be used in the field of practical implementation of ultra-wideband radio communication systems

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Zhang, Honglin, Haiquan Zhong, Jianhao Ye, Shaowei Liao, and Bing Li. "A Wideband High-Gain Dipole with Impedance and Field Control Structures." Electronics 11, no. 12 (June 16, 2022): 1892. http://dx.doi.org/10.3390/electronics11121892.

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Dipoles are favorable in various applications because of their simple and light structure. However, narrow bandwidths and low gain values limit their usage in wideband and long-range systems. To solve this problem, this paper presents a new method to achieve wideband high-gain for dipoles with embedded double-sleeve and a bathtub-shaped cavity. The double-sleeve adjusts the dipole’s impedance and enforces wideband matching from 4.8 GHz to 9.4 GHz. Furthermore, the bathtub-shaped cavity reshapes the antenna’s radiation field and elevates the antenna’s boresight gain to be above 10 dBi in the bandwidth of 5 GHz to 9.4 GHz, which is a 7.75 dBi improvement over the 2.15 dBi gain of conventional dipoles. The combination of the two structures creates a wideband high-gain dipole that features an average simulated boresight realized gain of 11.8 dBi in the impedance bandwidth of 64.8%. Thus, the new antenna can work efficiently in wideband and long-range systems because of its enhanced bandwidth and gain performances.

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Hu, Zhuhua, Yong Bai, Lu Cao, Mengxing Huang, and Mingshan Xie. "A Sequential Compressed Spectrum Sensing Algorithm against SSDH Attack in Cognitive Radio Networks." Journal of Electrical and Computer Engineering 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/4782718.

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Spectrum sensing is one of the key technologies in wireless wideband communication. There are still challenges in respect of how to realize fast and robust wideband spectrum sensing technology. In this paper, a novel nonreconstructed sequential compressed wideband spectrum sensing algorithm (NSCWSS) is proposed. Firstly, the algorithm uses a sequential spectrum sensing method based on history memory and reputation to ensure the robustness of the algorithm. Secondly, the algorithm uses the strategy of compressed sensing without reconstruction, which thus ensures the sensing agility of the algorithm. The algorithm is simulated and analyzed by using the centralized cooperative sensing. The theoretical analysis and simulation results reveal that, under the condition of ensuring the certain detection probability, the proposed algorithm effectively reduces complex computation of signal reconstruction, significantly reducing the wideband spectrum sampling rate. At the same time, in the cognitive wideband communication scenarios, the algorithm also achieves a better defense against the SSDF attack in spectrum sensing.

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46

Sharma, Sonia, and Chandra Charu Tripathi. "Wideband to concurrent tri-band frequency reconfigurable microstrip patch antenna for wireless communication." International Journal of Microwave and Wireless Technologies 9, no. 4 (August 1, 2016): 915–22. http://dx.doi.org/10.1017/s1759078716000763.

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This paper proposes a novel wideband to concurrent tri-band frequency reconfigurable microstrip antenna. The frequency reconfiguration is achieved by using a pair of PIN diodes in the antenna feed line to switch the antenna either in wideband mode or in concurrent tri-band mode. In order to improve the bandwidth and gain of the antenna for wideband operation, the properties of J-K inverter and split ring resonators are exploited. To demonstrate the versatility of this concept a prototype is fabricated and tested here. The tested results in wideband mode shows that the proposed antenna operates from 3.58 to –3.82 GHz, which is 4.08 times larger than the bandwidth of a simple microstrip patch antenna. In the concurrent tri-band mode frequency tuning is done by microstrip open stub at 1.5 GHz, 1.9 GHz, and 3.5 GHz. Gain of the proposed antenna is better than 2.7 dB in wideband mode and 2.7 dB in concurrent tri-band mode.

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47

Rullyanto, Rullyanto, and Mohamad Fathoni. "Analisa Unjuk Kerja Sistem Downlink Dedicated Channel (DCH) Pada Wideband CDMA." Jurnal Ilmiah Giga 16, no. 1 (July 8, 2019): 17. http://dx.doi.org/10.47313/jig.v16i1.586.

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Sistem seluler Wideband Code Division Multiple Acces (WCDMA) saat ini berkembang sangat pesat pada tugas akhir ini dilakukan Analisa Unjuk Kerja Sistim Downlink Dedicated Channel (DCH) pada Wideband CDMA. Untuk menganalisa performa atau unjuk kerja dari sistem Downlink DCH pada Wideband CDMA dicari nilai kesalahan bit pada saat pengiriman yang biasa dikenal dengan nama Bit Error Rate pada Cyclic Redundancy Check (CRC) dan channel coding dengan input Dedicated Traffik Channel (DTCH) dan Dedicated Control Channel (DCCH) dicari nilai Bit Error Rate (BER) pada sistem Downlink Dedicated Channel (DCH) Wideband CDMA dan dicari nilai Block Error Rate (BLER) pada sistem Downlink Dedicated Channel (DCH) Wideband CDMA. Analisa ini menggunakan piranti lunak Matlab 7.0.1 untuk mengetahui jumlah kesalahan Bit Error Rate (BER) dengan jenis kanal Multipath Fading. Dari hasil simulasi dengan Input 106 pada 7 dB dengan menggunakan Eb/No dari 1 hingga 7 dB maka didap atkan Bit Error Rate dengan nilai Bit Error Rate BER 1,8 x 10^-6.

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Lu, Ping, Zhiwei Liu, Enpu Lei, Kama Huang, and Chaoyun Song. "Superdirective Wideband Array of Circular Monopoles with Loaded Patches for Wireless Communications." Sensors 23, no. 18 (September 13, 2023): 7851. http://dx.doi.org/10.3390/s23187851.

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A wideband superdirective array, composed of a two-element circular monopole configuration, is introduced. The monopoles are placed in close proximity, facing each other on a metal ground. To ensure good matching at high frequencies, two pairs of elliptical patches are added to the sides of the monopoles, enhancing the surface current of the circular patch for wideband performance. To achieve equal amplitude excitation and the desired phase difference, a wideband power divider with a phase shifter is designed to feed the antenna array. Simulation and measurement results demonstrate that the proposed wideband antenna array, operating within the frequency range of 2.94–7.93 GHz, exhibits a maximum directivity of 8.36–10 dBi, with an antenna efficiency ranging from 47.86 to 83.18% across the bandwidth. The proposed array has the advantages of miniaturization, high directivity and wideband operation and can be widely used in various portable wireless communication systems, including WLAN (5.05–5.9 GHz), ISM (5.725–5.875 GHz), 5G communication (3.3–3.8 GHz), etc.

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Fengzhen, Zhang, Li Guijuan, Zhang Zhaohui, and Hu Chen. "Doppler shift extraction of wideband signal using spectrum scaling matching." MATEC Web of Conferences 208 (2018): 01001. http://dx.doi.org/10.1051/matecconf/201820801001.

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Doppler shift is an important feature of moving targets. It can be used to extract target velocity, distance, track and other movement parameters. According to the problem of extracting Doppler shift for wideband signals with unstable line spectrum or no line spectrum, we proposed a Doppler shift extraction method for wideband signals based on spectral scaling matching. Firstly, a spectrum reference matrix corresponding to different relative Doppler shift is generated. Then, the matching degree of Doppler signal spectrum and reference matrix is measured by linear correlation coefficient. Finally, the Doppler shift of wideband signals is extracted through matching degree optimization. Simulation results show that the proposed method can extract the Doppler shift characteristics of wideband signals effectively.

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Sun, Hai Feng, Xiao Ming Wu, Chen Da Zheng, and Xiao Qian Liu. "Wide-Band Modeling of the IGBT Module Based on the Physical Structure." Advanced Materials Research 986-987 (July 2014): 1954–57. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1954.

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This paper presents a new modeling method, based on the physical structure of the IGBT module, considering the distribution parameters of high frequency.This method is simple and the wideband model has physical meaning, by choosing suitable model initial parameters as well as the objective function which use the iterative optimization algorithm to solve the model parameters.Comparing the wideband model with the measured results ,the wideband model maintain high accuracy in the range of 100KHz ~ 20MHz.

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Journal articles on the topic 'Wideband'

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