In-line ports microstrip bandpass filters in box-like coupling schemes

Liu Qing; Lü Dalong; Sun Jiuhui; Zhou Dongfang; Zhang Dewei

doi:10.11884/HPLPB201931.190077

Volume 31 Issue 9

Sep. 2019

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Article Navigation > High Power Laser and Particle Beams > 2019 > 31(9): 093002

Liu Qing, Lü Dalong, Sun Jiuhui, et al. In-line ports microstrip bandpass filters in box-like coupling schemes[J]. High Power Laser and Particle Beams, 2019, 31: 093002. doi: 10.11884/HPLPB201931.190077

Citation:

Liu Qing, Lü Dalong, Sun Jiuhui, et al. In-line ports microstrip bandpass filters in box-like coupling schemes[J]. High Power Laser and Particle Beams, 2019, 31: 093002. doi: 10.11884/HPLPB201931.190077

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In-line ports microstrip bandpass filters in box-like coupling schemes

doi: 10.11884/HPLPB201931.190077

Department of Information Systems Engineering, Information Engineering University, Zhengzhou 450001, China

Received Date: 2019-03-21
Rev Recd Date: 2019-06-05
Publish Date: 2019-09-15

Abstract

Abstract

According to the miniaturization and high performance, the characteristic of a second-order bandpass filter (BPF) with in-line ports based on dual-mode square-shaped resonator is researched, and higher-order BPFs with in-line ports using single-mode resonators and dual-mode resonators are proposed. The proposed filters can be modeled by the box-like coupling scheme, which can realize flexible frequency responses. Moreover, the positions of transmission zeros (TZs) can be easily adjusted to satisfy different applications. An additional TZ can be achieved by the proposed filter in box-like topology for the parasitic coupling in the diagonal cross-coupling path. To verify the proposed structure and design method, third-order and fifth-order filters with center frequency of 5.2 GHz are designed, fabricated and measured. The responses of coupling matrix, simulated and measured results are in good agreement, which demonstrates the feasibility of the proposed filters with high performance.
- bandpass filter,
- box-like topology,
- asymmetric response,
- quasi-elliptic response,
- dual-mode,
- ring resonator,
- in-line port

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References(19)

References

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