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Design of X-Bandpass Waveguide Chebyshev Filter Based on CSRR Metamaterial for Telecommunication Systems
摘要： This paper presents a new design of a ?fth order bandpass waveguide ?lter with Chebyshev response which operates in the X-band at 10 GHz center frequency. By using a complementary split ring resonator (CSRR) upper and lower sections that are placed on the same transverse plane and are not on the same parallel line, CSRR sections are shifted from each other. A simple model of lumped elements RLC is introduced and calculated as well. The model of the proposed bandpass waveguide ?lter is synthesized and designed by using computer simulation technology (CST). Hereafter, by selecting proper physical parameters and optimizing the overall CSRR geometrical dimensions by taking into consideration the coupling effect between resonators, a shortened length of the overall ?lter, and a wider bandwidth over the conventional one are obtained. As a result, the proposed ?lter is compared with the conventional bandpass waveguide ?lter that is coupled by inductive irises with Chebyshev response, in addition to other studies that have used the metamaterial technique. The proposed ?lter reduces the overall physical length by 31% and enhances the bandwidth up to 37.5%.
关键词： metamaterial,Chebyshev ?lter,meta-resonator,cavity,X-band,waveguide
更新于2025-09-19 17:13:59
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[IEEE 2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE - Barcelona, Spain (2019.9.2-2019.9.6)] 2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE - Influence of Planar Material Size and Position on Shielding Effectiveness Measurements using the Dual Waveguide Method
摘要： The dual waveguide method for shielding effectiveness measurements is a very effective and practical method, as it can provide reliable results quickly and in a wide frequency range. However, when it comes to planar materials, the size and position of the sample is critical. Different sizes and shapes of the sample need to be tested in order to determine the one that provides reliable results. Furthermore, the position of the sample along the waveguide, as well as its distance from the source, using different lengths of waveguides, need to be investigated. In this paper, these two parameters are studied in order to examine their effect on the results.
关键词： shielding effectiveness,L-band waveguide,material,X-band waveguide,dual waveguide
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - X-Band Waveguide Coupler with Low Ripple and Losses
摘要： A novel wideband coupler operating in the frequency bandwidth from 10.7 GHz to 12.8 GHz is presented. The coupler consists of two crossed rectangular waveguides coupled through four circular apertures with different diameters. In order to improve the operating bandwidth and reduce the coupling ripple across the frequency bandwidth, a Chebyshev distribution is used to determine the radius and distance between the apertures. The coupling coefficient in the operating bandwidth is below -30 dB with less than 0.6 dB ripple. The return loss of all the ports is under -15 dB, and the maximum isolation between ports is below -60 dB. The proposed coupler has the advantage of having small size and low losses, which make it appropriate for high-power applications. The whole structure is simulated and optimized using CST microwave studio software and then fabricated and measured. Excellent agreement between measured and simulated results was achieved.
关键词： directional couplers,wide band couplers,X-band waveguide couplers
更新于2025-09-11 14:15:04
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[IEEE 2018 China International SAR Symposium (CISS) - Shanghai, China (2018.10.10-2018.10.12)] 2018 China International SAR Symposium (CISS) - High Gain Planar Antenna Array for Ka Band SAR Applications
摘要： This paper presents the design of a high gain low profile antenna array for Ka band airborne and space borne SAR systems. The antenna array, with a dimensions of 454×58.8×12.4mm3, is divided into a number of small linear sub arrays, and a low loss waveguide feed network, with a dimension of 360.5×48.6×6.2mm3 is designed to combined all these sub arrays to form a fixed beam antenna. The antenna array adopts metal waveguide slot antenna as the element where the slots are open in the narrow side. The slots in the array are designed to fed with equal magnitude and equal phase, and the size of the slots as well as the sub array are all optimized to have a well impedance matching while a high gain at the same time. What’s more, a groove is added at the side of the array to further enhance the radiation. The simulated maximum gain of the antenna array is 34.1dBi at the central frequency and the VSWR is less than 2 in a bandwidth of more than 0.5GHz, indicating that the designed antenna array is a good candidate for future Ka band SAR systems.
关键词： Ka band,waveguide slot,high gain,SAR antenna
更新于2025-09-09 09:28:46