Cross-band microstrip diplexer design

Shaokang Duan; Yun Zhou; Linhan Li; Lin Li; Dingwen Kang

doi:10.1117/12.2660970

2 February 2023 Cross-band microstrip diplexer design

Shaokang Duan, Yun Zhou, Linhan Li, Lin Li, Dingwen Kang

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Proceedings Volume 12462, Third International Symposium on Computer Engineering and Intelligent Communications (ISCEIC 2022); 1246219 (2023) https://doi.org/10.1117/12.2660970
Event: International Symposium on Computer Engineering and Intelligent Communications (ISCEIC 2022), 2022, Xi'an, China

Abstract

A large span ultra-broadband microstrip planar structured diplexer are presented. Firstly, this paper describes the general steps for designing filters based on the synthesis of N+2 coupling matrices, based on microstrip lines. Secondly, this paper implements a dual-way frequency combing of C and X band satellite downlink signal based on a cross-finger filter structure and a microstrip T-junction. Finally, the diplexer was tested for practical processing. The diplexer operates in the frequency range of 3.7GHz-4.2GHz and 7.25GHz-7.75GHz, with in-band insertion loss better than 1.6dB and 2.6dB respectively, return loss better than 15.6dB and 15dB respectively, and passband isolation greater than 60dB. The test results are consistent with the simulation results and meet the design specifications.

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Shaokang Duan, Yun Zhou, Linhan Li, Lin Li, and Dingwen Kang "Cross-band microstrip diplexer design", Proc. SPIE 12462, Third International Symposium on Computer Engineering and Intelligent Communications (ISCEIC 2022), 1246219 (2 February 2023); https://doi.org/10.1117/12.2660970

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KEYWORDS

Linear filtering

Device simulation

X band

Circuit switching

Dielectrics

Signal attenuation

Lithium

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