Multiband bandpass filter design using E‐plane septa for waveguide application

Li, Xiaokun; Zhang, Yonghong; Da Xu, Kai; Wang, Junfeng; Li, Shudan; Fan, Yong

doi:10.1002/mop.31394

Cited by 3 publications

References 10 publications

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A quad‐band bandpass filter using sept‐mode double square‐ring loaded resonator

Zhu

Wang

Kim

et al. 2020

Micro & Optical Tech Letters

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A quad‐band bandpass filter (BPF) using a sept‐mode double square‐ring loaded resonator (DSRLR) is presented in this article. Based on the symmetrical geometric construction of the DSRLR, the even‐ and odd‐mode analysis with theoretical equations is employed to analyze the proposed BPF, and current density are obtained. Additionally, multimode splitting and resonant characteristics of the proposed DSRLR are explored. Accordingly, the design procedure is given after a pair of feedlines with dual‐finger structure is added to the I/O ports to introduce extra transmission zeros (TZs). Four TZs—including two created by the dual‐finger feedlines—are produced to separate four passbands that exhibit a sharp skirt and high stopband rejection. Finally, a microstrip quad‐band BPF is fabricated on a Teflon substrate with four measured passbands centered at 2.46, 3.41, 6.65, and 9.09 GHz with insertion losses of 0.68, 0.73, 0.81, and 1.23 dB, respectively. A satisfactory agreement is achieved between the measurement results and full‐wave simulation results.

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A quad‐band bandpass filter using sept‐mode double square‐ring loaded resonator

Zhu

Wang

Kim

et al. 2020

Micro & Optical Tech Letters

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Synthesis design of quad‐band bandpass filter with mixed frequency transformation method

Wang

2023

Micro & Optical Tech Letters

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This paper presents an analysis method to design quad-band bandpass filters (BPFs) based on the mixed frequency transformation method. The frequency mapping technique is employed to obtain the design parameters by defining the frequency ranges of each passband. By using the proposed approach, the resonant angular frequencies and susceptance slope parameters can be obtained analytically. To validate our theory, a third-order Chebyshev BPF and a fourth-order elliptic BPF with different bandwidths are successfully synthesized. Moreover, a second-order test BPF with a Chebyshev approximation and 20 dB passband return loss is synthesized, designed, fabricated, and measured. The measured insertion losses are 1.82, 2.01, 3.12, and 2.51 dB for each passband and measured return losses are better than 15.2 dB for all passbands. The measured results verify the designed BPF and also confirm the theoretical prediction.

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