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Artículos de revistas sobre el tema "APERTURE COUPLED ANTENNA"

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Autor: Grafiati

Publicado: 11 de septiembre de 2023

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1

Kirov, Georgi, Georgi Chervenkov y Chavdar Kalchev. "Aperture Coupled Microstrip Short Backfire Antenna". Journal of Electrical Engineering 63, n.º 2 (1 de marzo de 2012): 75–80. http://dx.doi.org/10.2478/v10187-012-0011-0.

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Aperture Coupled Microstrip Short Backfire Antenna A broadband aperture coupled microstrip short backfire antenna is described herein. It consists of a feed part (a microstrip feed line and a coupling slot in a metal ground) and a radiating part with two radiators: a patch antenna and a backfire antenna. The bandwidth widening of the antenna is achieved by use of two resonances: a patch resonance and a backfire resonance. The antenna is designed to operate within the Ku-band. It has a frequency bandwidth of about 15% and a maximum gain of 11.5 dBi. Within the antenna bandwidth the gain and the radiation efficiency have values more than 9 dBi and 82.1%, respectively. The designed antenna has a simple and compact construction and high mechanical and electrical characteristics. It can be used as a single antenna or as an element of microstrip antenna arrays with various applications in the contemporary communication systems.

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2

Soni, Brijesh Kumar, Kamaljeet Singh, Amit Rathi y Sandeep Sancheti. "Performance Improvement of Aperture Coupled MSA through Si Micromachining". International Journal of Circuits, Systems and Signal Processing 16 (10 de enero de 2022): 272–77. http://dx.doi.org/10.46300/9106.2022.16.33.

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In recent times rectangular patch antenna design has become the most innovative and popular subject due to its advantages, such as being lightweight, conformal, ease to fabricate, low cost and small size. In this paper design of aperture coupled microstrip patch antenna (MSA) on high index semiconductor material coupled with micromachining technique for performance enhancement is discussed. The performance in terms of return loss bandwidth, gain, cross-polarization and antenna efficiency is compared with standard aperture coupled antenna. Micromachining underneath of the patch helps in to reduce the effective dielectric constant, which is desirable for the radiation characteristics of the patch antenna. Improvement 36 percent and 18 percent in return loss bandwidth and gain respectively achieved using micromachined aperture coupled feed patch, which is due to the reduction in losses, suppression of surface waves and substrate modes. In this article along with design, fabrication aspects on Si substrate using MEMS process also discussed. Presented antenna design is proposed antenna can be useful in smart antenna arrays suitable in satellite, radar communication applications. Two topologies at X-band are fabricated and comparison between aperture coupled and micromachined aperture coupled are presented. Index Terms—Microstrip Patch Antenna, Aperture Coupled, Micromachining, High Resistivity Silicon

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3

Чурсина, О. А., Е. А. Литинская, К. В. Плыкин, С. В. Поленга, А. А. Баскова y Р. О. Рязанцев. "Низкопрофильная сканирующая антенная решетка на основе излучающего элемента с апертурной связью". Письма в журнал технической физики 49, n.º 15 (2023): 12. http://dx.doi.org/10.21883/pjtf.2023.15.55857.19563.

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A low-profile antenna array based on an aperture-coupled element with wide-angle mechanoelectric scanning is considered. The scanning sector of the developed antenna array is 0°-60° by the criterion of the gain degradation not more than by 3 dB at a profile of the whole antenna is 48 mm. Developed antenna aperture-coupled element with two linear orthogonal polarizations has a multilayer structure and gain more 7 dB in the frequency band 10.7-12.75 GHz. The presented antenna array consists of eight identical subarrays, each consisting of 16 aperture-coupled radiators. Modeling and analysis of the directional characteristics of the antenna array based on an aperture-coupled radiator are performed. Conclusions about the applicability of the proposed antenna array based on the aperture-coupled element in ground terminals of satellite communication, including for low-orbit and medium-orbit systems is done.

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4

Rao, Q. y R. H. Johnston. "Modified Aperture Coupled Microstrip Antenna". IEEE Transactions on Antennas and Propagation 52, n.º 12 (diciembre de 2004): 3397–401. http://dx.doi.org/10.1109/tap.2004.836415.

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5

Park, I. y R. Mittra. "Aperture-coupled small microstrip antenna". Electronics Letters 32, n.º 19 (1996): 1741. http://dx.doi.org/10.1049/el:19961188.

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6

Milligan, T. y N. Herscovici. "The aperture-coupled helix antenna". IEEE Antennas and Propagation Magazine 37, n.º 3 (junio de 1995): 47–50. http://dx.doi.org/10.1109/74.388818.

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7

Wang, Bo, Yiqi Zhuang, Xiaoming Li y Weifeng Liu. "Design of a novel dual ports antenna to enhance sensitivity of handheld RFID reader". International Journal of Microwave and Wireless Technologies 8, n.º 2 (21 de abril de 2015): 369–77. http://dx.doi.org/10.1017/s1759078715000756.

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A compact dual ports antenna with high isolation is proposed for handheld radio frequency identification (RFID) reader which is rarely reported in open literatures. Different with conventional handheld RFID reader antennas with single port, the proposed antenna transmits and receives signal separately. The proposed antenna operating with full duplex mode can enhance effectively sensitivity of reader, since the strong transmitting signal of reader with single port is usually highly coupled with weak receiving backscatter signal of tag. The antenna utilizes E-shaped aperture-coupled patch structure that occupies less volume and provides further space-saving efficiency. The height of the proposed antenna is only 6.8 mm and the volume of that is 80 mm × 80 mm × 6.8 mm, which is easy to integrate in handheld RFID readers. The antenna uses two E-shaped coupling apertures to excite two orthogonal modes for dual-polarized operation. High isolation of around −30 dB is obtained by proper arrangement of the length of coupling apertures and the position of the stubs. The measured results show −10 dB matching band and −25 dB isolation band from 2.32 to 2.6 GHz and from 2.3 to 2.55 GHz, respectively. The antenna is suitable for applications in handheld RFID readers.

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8

Duffy, S. M. y D. M. Pozar. "Circularly polarised aperture coupled microstrip antenna". Electronics Letters 31, n.º 16 (3 de agosto de 1995): 1303–5. http://dx.doi.org/10.1049/el:19950937.

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9

Oostlander, R., Y. M. M. Antar, A. Ittipiboon y M. Cuhaci. "Aperture coupled microstrip antenna element design". Electronics Letters 26, n.º 4 (1990): 224. http://dx.doi.org/10.1049/el:19900151.

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10

Croq, F. y A. Papiernik. "Large bandwidth aperture-coupled microstrip antenna". Electronics Letters 26, n.º 16 (1990): 1293. http://dx.doi.org/10.1049/el:19900832.

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11

Wang, J., R. Fralich, C. Wu y J. Litva. "Multifunctional aperture coupled stack patch antenna". Electronics Letters 26, n.º 25 (1990): 2067. http://dx.doi.org/10.1049/el:19901333.

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12

Konkol, Matthew R., Dylan D. Ross, Kevin P. Shreve, Charles E. Harrity, Shouyuan Shi, Christopher A. Schuetz y Dennis W. Prather. "High-Power, Aperture Coupled Photonic Antenna". IEEE Photonics Technology Letters 29, n.º 14 (15 de julio de 2017): 1207–10. http://dx.doi.org/10.1109/lpt.2017.2713303.

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13

Hall, R. C. "Full-wave aperture coupled patch antenna". Electronics Letters 29, n.º 24 (1993): 2073. http://dx.doi.org/10.1049/el:19931384.

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14

Kao, Nien-An, Cheng-Chi Hu, Jin-Jei Wu y C. F. Jou. "Active aperture-coupled leaky-wave antenna". Electronics Letters 34, n.º 23 (1998): 2183. http://dx.doi.org/10.1049/el:19981539.

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15

Hsu, Wen-Hsiu y Kin-Lu Wong. "Broadband aperture-coupled shorted-patch antenna". Microwave and Optical Technology Letters 28, n.º 5 (2001): 306–7. http://dx.doi.org/10.1002/1098-2760(20010305)28:5<306::aid-mop1025>3.0.co;2-6.

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16

Drossos, George, Zhipeng Wu y Lionel E. Davis. "Aperture-coupled cylindrical dielectric resonator antenna". Microwave and Optical Technology Letters 20, n.º 6 (20 de marzo de 1999): 407–14. http://dx.doi.org/10.1002/(sici)1098-2760(19990320)20:6<407::aid-mop14>3.0.co;2-7.

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17

Cheng, C. H., K. Li, K. F. Tang y T. Matsui. "A new aperture-coupled patch antenna". Microwave and Optical Technology Letters 38, n.º 5 (7 de julio de 2003): 422–23. http://dx.doi.org/10.1002/mop.11079.

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18

Morsy, Mohamed M. y Frances J. Harackiewicz. "Stacked aperture-coupled coplanar patch antenna". Microwave and Optical Technology Letters 51, n.º 5 (13 de marzo de 2009): 1228–30. http://dx.doi.org/10.1002/mop.24290.

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19

Indrianti, Rizka Kurnia. "Build a Rectangular Patch Single Microstrip Antenna with Aperture Coupled for Wifi Application 2.4 Ghz". JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING 3, n.º 1 (25 de julio de 2019): 8. http://dx.doi.org/10.31289/jite.v3i1.2464.

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<p><span>Wifi technology is a means of obtaining information in a fast way, to strengthen the signal, for that it is required that the functioning antenna emit and receive electromagnetic waves in which contained the information signal. A wide range of antennas have been developed for a wide range of applications, one of which is a microstrip antenna. Microstrip antennas have small characteristics, are lightweight, thin, easy to fabricate, and can be used at very long distances. The results of single rectangular patch microstrip antenna measurements indicate that the antenna can work optimally with a frequency of 2,440 GHz, has a return loss-22,182 dB value, VSWR 1,169 value, 0.3452 dB bandwidth value, LOS-45.6 dBm power value with Percentage upload is 97% higher than the reference antenna and the download percentage is 88% higher than the reference antenna, NLOS-79 dBm value with a percentage upload of 33% compared to the reference antenna and the download percentage 12% higher than the Reference antenna, for the range of distances capable of receiving signals up to 120 meters with a percentage of percentage of is 16% higher than the reference antenna.</span></p>

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20

Venneri, F., S. Costanzo y G. Di Massa. "Bandwidth Behavior of Closely Spaced Aperture-Coupled Reflectarrays". International Journal of Antennas and Propagation 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/846017.

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The bandwidth features of reflectarray antennas are analyzed by examining in detail the phase errors due to the compensation mechanism for spatial phase delays. A bandwidth estimation rule is defined, taking into account the combined effects due to the overall antenna geometry and the frequency response of the single reflectarray element. An aperture-coupled reflectarray configuration with reduced interelement spacing is considered as broadband solution for the implementation of small reflectarrays. A 20 GHz aperture-coupled element is synthesized for the design of a 12 diameter reflectarray, showing a simulated 1 dB gain bandwidth of 23%.

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21

Khan, Osama, Johannes Meyer, Klaus Baur, Saeed Arafat y Christian Waldschmidt. "Aperture coupled stacked patch thin film antenna for automotive radar at 77 GHz". International Journal of Microwave and Wireless Technologies 11, n.º 10 (10 de junio de 2019): 1061–68. http://dx.doi.org/10.1017/s1759078719000795.

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AbstractA hybrid thin film multilayer antenna for automotive radar is presented in this work. A 2 × 8 aperture coupled stacked patch antenna array is realized on a single layer printed circuit board (PCB) using a novel thin film-based approach. Using a compact 180° phase difference power divider, inter-element spacing in a 2×2 sub-array is reduced. Measurement results show a 19% (67.9–82.5 GHz) impedance bandwidth and a wideband broadside radiation pattern, with a maximum gain of 15.4 dBi realized gain at 72 GHz. The presented antenna compares favorably with other multilayer PCB antennas in terms of performance, with the advantage of simpler manufacturing and robust design. The antenna can be employed in mid-range automotive radar applications.

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22

Chen, P., X. D. Yang, C. Y. Chen y Z. H. Ma. "Broadband Multilayered Array Antenna with EBG Reflector". International Journal of Antennas and Propagation 2013 (2013): 1–4. http://dx.doi.org/10.1155/2013/250862.

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Most broadband microstrip antennae are implemented in the form of slot structure or laminate structure. The impedance bandwidth is broadened, but meanwhile, the sidelobe of the directivity pattern and backlobe level are enlarged. A broadband stacked slot coupling microstrip antenna array with EBG structure reflector is proposed. Test results indicate that the proposed reflector structure can effectively improve the directivity pattern of stacked antenna and aperture coupled antenna, promote the front-to-back ratio, and reduce the thickness of the antenna. Therefore, it is more suitable to be applied as an airborne antenna.

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23

Vishwakarma, Rajesh Kumar y Sanjay Tiwari. "Aperture Coupled Microstrip Antenna for Dual-Band". Wireless Engineering and Technology 02, n.º 02 (2011): 93–101. http://dx.doi.org/10.4236/wet.2011.22013.

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24

Sullivan, P. y D. Schaubert. "Analysis of an aperture coupled microstrip antenna". IEEE Transactions on Antennas and Propagation 34, n.º 8 (agosto de 1986): 977–84. http://dx.doi.org/10.1109/tap.1986.1143929.

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25

Wang, Junfang, Hang Wong, Zhuoqiao Ji y Yongle Wu. "Broadband CPW-Fed Aperture Coupled Metasurface Antenna". IEEE Antennas and Wireless Propagation Letters 18, n.º 3 (marzo de 2019): 517–20. http://dx.doi.org/10.1109/lawp.2019.2895618.

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26

Qinjiang Rao, T. A. Denidni y R. H. Johnston. "A new aperture coupled microstrip slot antenna". IEEE Transactions on Antennas and Propagation 53, n.º 9 (septiembre de 2005): 2818–26. http://dx.doi.org/10.1109/tap.2005.854521.

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27

Lee, R. Q. y R. N. Simons. "Coplanar-waveguide aperture-coupled microstrip patch antenna". IEEE Microwave and Guided Wave Letters 2, n.º 4 (abril de 1992): 138–39. http://dx.doi.org/10.1109/75.129441.

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28

Keller, M. G., D. J. Roscoe, M. B. Oliver, R. K. Mongia, Y. M. M. Antar y A. Ittipiboon. "Active aperture-coupled rectangular dielectric resonator antenna". IEEE Microwave and Guided Wave Letters 5, n.º 11 (1995): 376–78. http://dx.doi.org/10.1109/75.473537.

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29

Pozar, D. M. "Microstrip antenna aperture-coupled to a microstripline". Electronics Letters 21, n.º 2 (1985): 49. http://dx.doi.org/10.1049/el:19850034.

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30

Zheng, Jun-Hao, Ying Liu y Shu-Xi Gong. "APERTURE COUPLED MICROSTRIP ANTENNA WITH LOW RCS". Progress In Electromagnetics Research Letters 3 (2008): 61–68. http://dx.doi.org/10.2528/pierl08013102.

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31

El Yazidi, M., M. Himdi y J. P. Daniel. "Analysis of aperture-coupled circular microstrip antenna". Electronics Letters 29, n.º 11 (27 de mayo de 1993): 1021–22. http://dx.doi.org/10.1049/el:19930681.

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32

B�ke, A., A. Moumen, I. L. Morrow y L. P. Ligthart. "Optimized dual-polarized aperture-coupled patch antenna". Microwave and Optical Technology Letters 27, n.º 4 (2000): 252–55. http://dx.doi.org/10.1002/1098-2760(20001120)27:4<252::aid-mop9>3.0.co;2-3.

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33

Wincza, K., S. Gruszczynski y K. Sachse. "Aperture coupled to stripline antenna element for integrated antenna arrays". Electronics Letters 42, n.º 3 (2006): 130. http://dx.doi.org/10.1049/el:20063951.

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34

Tong, San-Qiang, Bing-Zhong Wang y Ren Wang. "A tightly coupled dipole array used for radiation power improvement on finite radiation aperture". Acta Physica Sinica 70, n.º 20 (2021): 204101. http://dx.doi.org/10.7498/aps.70.20210309.

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Radiation power of an electromagnetic wave plays a decisive role in its transmission distance. Traditionally, the radiation power can be improved by expanding the radiation aperture size of the antenna array or increasing input power of the unit cell. However, the radiation aperture size is always restricted by assembly space. The input power improvement of the unit cell is always limited by the signal source. It is difficult to improve radiation power on a finite radiation aperture. However, the radiation power on a finite radiation aperture is related closely to the number of antenna elements and the radiation efficiency of the antenna array. It is useful to arrange more elements and improve radiation efficiency of the antenna array to improve the radiation power on a finite radiation aperture. Wideband wide-angle scanning phased array is able to make full use of a finite radiation aperture. The wide-angle scanning properties make it possible for the radiated power to cover a wide area. In this paper, a compact wideband wide-angle scanning tightly coupled dipole array (TCDA) is proposed. A high permittivity substrate and compact wideband balun are used for miniaturizing the antenna array. The period of the unit cell is only 0.144<i>λ</i><sub>high</sub> × 0.144<i>λ</i><sub>high</sub> (<i>λ</i><sub>high</sub> is the wavelength at the highest operation frequency in free space). Parameters of the balun are optimized to improve impedance matching between the balun and the antenna array. Two bilateral frequency selective surfaces (FSSs) are used to replace traditional dielectric superstrate to improve the impedance matching between the antenna array and free space. A low-loss dielectric substrate is used to reduce dielectric loss of the antenna array. In these ways, the radiation efficiency is greatly improved. The simulation results show that the proposed antenna array operates at 1.7–5.4 GHz (3.2:1) while scanning up to 65° in the E plane, 45° in the H plane and 60° in the D plane with following a rigorous impedance matching criterion (active VSWR < 2). A 16 × 16 prototype array is fabricated and measured. Good agreement is achieved between the simulation results and the measurement results. Compared with the designs in the literature, the proposed antenna array has an excellent performance in radiation power on a finite radiation aperture.

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35

Umair, Hassan, Niaz Muhammad, Tayyab Hassan, Imran Rashid y Farooq A. Bhatti. "Aperture-coupled ESPAR antenna with unique feed network for symmetric switched beam radiation patterns". International Journal of Microwave and Wireless Technologies 9, n.º 3 (4 de abril de 2016): 675–83. http://dx.doi.org/10.1017/s1759078716000362.

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Aperture-coupled ESPAR antenna with a unique feed structure for switched beam application has been presented. The feed structure provides control over surface current of the driven element with the help of which main lobe can be steered in desired direction. This control has been achieved through the use of PIN-diodes. Finite element method has been utilized for design and simulated and measured results have been presented for validation. The antenna has the ability to steer the main beam in six directions. All radiation patterns are symmetric. The planar aperture-coupled nature of proposed antenna is ideal for integration and commercialization.

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36

Khayal, Bashar I. K. y Alaa Elrouby. "Broadband Dual-Polarized Aperture-Coupled Patch Antenna for 5G Applications". International Journal for Research in Applied Science and Engineering Technology 10, n.º 8 (31 de agosto de 2022): 666–71. http://dx.doi.org/10.22214/ijraset.2022.46234.

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Abstract: This paper presents the design of a dual-polarized aperture-coupled microstrip antenna array for Sub-6GHz 5G communication systems. The antenna operates at 3.5 GHz and consists of 4×4 square patches. The proposed 4×4 array antenna feds by aperture-coupled feed line provide broadband bandwidth to operate in the N78 sub-6GHz 5G frequency band. The dualpolarized is presented, which gives two communications channels. The antenna consists of three layers and is designed on Rogers RO4003C substrate with a dielectric constant of 3.55 and substrate thickness of 0.8 mm. The final design of the antenna array with an overall size of 269 mm × 269 mm × 12.5 mm, and the results show that the 4×4 array has a 10dB bandwidth between 3.3-3.8 GHz and a maximum gain of 14.9 dB at 3.5 GHz, and the isolation between the two ports was 30 dB. The proposed antenna's gain, radiation efficiency, and bandwidth satisfy the requirements of 5G base station systems.

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37

Hamidah Abd Hamid, Saidatul, Goh Chin Hock y M. T. Ali. "Analysis of Performance on Circular Patch Antenna Based on Different Feeding Techniques". International Journal of Engineering & Technology 7, n.º 4.1 (12 de septiembre de 2018): 81. http://dx.doi.org/10.14419/ijet.v7i4.1.28230.

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This paper presents a simulation and analysis of a circular patch antenna with different feeding techniques. The objectives of this analysis are to design the microstrip circular patch antennas using five types of feedings techniques which are stepped feed, inset feed, coaxial feed, aperture coupled feed, and proximity feed, to analyze and compares the performance of the antenna design. Performance characteristics of the antenna such as return loss S11 parameter <-10dB, directivity, gain, bandwidth, side lobe level, beam width, and voltage standing wave ratio (VSWR) parameters of each of the feeding methods designs are obtained and compared.

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38

Jiang, Hao, Weiming Li y Zhenghui Xue. "Modified Microstrip Aperture Coupled Patch Antenna with Sierpinski Fractal Geometry". International Journal of Antennas and Propagation 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/132462.

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A two-layer modified microstrip aperture coupled patch antenna with Sierpinski fractal geometry is presented in this paper. The effects of the two coupling slots and the parasitic patch are discussed. The proposed antenna can work on 956 MHz to 968 MHz, 3.654 GHz to 3.78 GHz, and 8.81 GHz to 9.28 GHz three frequency bands, and the maximum gain in each band is 4.64 dBi, 8.46 dBi, and 7.85 dBi, respectively. The simulated result reveals that the Sierpinski patch antenna we proposed in this paper performs better on radiation properties.

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39

Buck, A. C. y D. M. Pozar. "Aperture-coupled microstrip antenna with a perpendicular feed". Electronics Letters 22, n.º 3 (1986): 125. http://dx.doi.org/10.1049/el:19860087.

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40

Chan, K. M., E. Lee, T. Y. Lee, P. Gardner y T. Dodgson. "Aperture-coupled, differentially-fed planar inverted F antenna". Electronics Letters 42, n.º 11 (2006): 608. http://dx.doi.org/10.1049/el:20060812.

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41

Antar, Y. M. M. y Z. Fan. "Characteristics of aperture-coupled rectangular dielectric resonator antenna". Electronics Letters 31, n.º 15 (20 de julio de 1995): 1209–10. http://dx.doi.org/10.1049/el:19950853.

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42

Chang, The-Nan y Jyun-Ming Lin. "Serial Aperture-Coupled Dual Band Circularly Polarized Antenna". IEEE Transactions on Antennas and Propagation 59, n.º 6 (junio de 2011): 2419–23. http://dx.doi.org/10.1109/tap.2011.2144553.

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43

Gauthier, G. P., J. P. Raskin, L. P. B. Katehi y G. M. Rebeiz. "A 94-GHz aperture-coupled micromachined microstrip antenna". IEEE Transactions on Antennas and Propagation 47, n.º 12 (1999): 1761–66. http://dx.doi.org/10.1109/8.817650.

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44

Coccioli, R., Fei-Ran Yang, Kuang-Ping Ma y T. Itoh. "Aperture-coupled patch antenna on UC-PBG substrate". IEEE Transactions on Microwave Theory and Techniques 47, n.º 11 (1999): 2123–30. http://dx.doi.org/10.1109/22.798008.

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45

Himdi, M., J. P. Daniel y C. Terret. "Transmission line analysis of aperture-coupled microstrip antenna". Electronics Letters 25, n.º 18 (1989): 1229. http://dx.doi.org/10.1049/el:19890824.

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46

Muhammad, Niaz, Hassan Umair, Zain Ul Islam, Zar Khitab, Imran Rashid y Farooq Ahmad Bhatti. "HIGH GAIN FSS APERTURE COUPLED MICROSTRIP PATCH ANTENNA". Progress In Electromagnetics Research C 64 (2016): 21–31. http://dx.doi.org/10.2528/pierc16022102.

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47

El Yazidi, M., M. Himdi y J. P. Daniel. "Aperture coupled microstrip antenna for dual frequency operation". Electronics Letters 29, n.º 17 (1993): 1506. http://dx.doi.org/10.1049/el:19931004.

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48

Shum, S. M. y K. M. Luk. "Analysis of aperture coupled rectangular dielectric resonator antenna". Electronics Letters 30, n.º 21 (13 de octubre de 1994): 1726–27. http://dx.doi.org/10.1049/el:19941195.

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49

Dhiman, Jonny y Sunil Kumar Khah. "Parasitic coupled microstrip antenna using shared aperture technique". Micro & Nano Letters 14, n.º 8 (julio de 2019): 845–47. http://dx.doi.org/10.1049/mnl.2018.5768.

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Hammad, H. F., Y. M. M. Antar y A. P. Freundorfer. "Dual band aperture coupled antenna using spur line". Electronics Letters 33, n.º 25 (1997): 2088. http://dx.doi.org/10.1049/el:19971452.

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