New negative coupling structure and its application on substrate integrated waveguide bandpass filters

Liu Qing; Lü Dalong; Bian Chenge; Zhou Dongfang

doi:10.11884/HPLPB201931.190189

Volume 31 Issue 12

Dec. 2019

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Liu Qing, Lü Dalong, Bian Chenge, et al. New negative coupling structure and its application on substrate integrated waveguide bandpass filters[J]. High Power Laser and Particle Beams, 2019, 31: 123001. doi: 10.11884/HPLPB201931.190189

Citation:

Liu Qing, Lü Dalong, Bian Chenge, et al. New negative coupling structure and its application on substrate integrated waveguide bandpass filters[J]. High Power Laser and Particle Beams, 2019, 31: 123001. doi: 10.11884/HPLPB201931.190189

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New negative coupling structure and its application on substrate integrated waveguide bandpass filters

doi: 10.11884/HPLPB201931.190189

Information Engineering University, Zhengzhou 450001, China

Received Date: 2019-05-27
Rev Recd Date: 2019-09-29
Publish Date: 2019-12-01

Abstract

Abstract

To design cross-coupled substrate integrated waveguide (SIW) bandpass filters (BPFs) with high performance, a new negative coupling structure is proposed, which is constructed by two coupled lines with shorted ends. The negative coupling structure is analyzed in detail. The stracture which can realize both relatively weak and strong negative coupling strength. The optimization method based on characteristic polynomials and reference zeros and poles of scattering parameters is realized for the filter design. To verify the proposed negative coupling structure, two fourth-order cross-coupled SIW BPFs with the center frequency of 10 GHz based on the optimized coupling matrixes are designed. The first one has a normalized bandwidth of 3% with a negative coupling in one cross-coupling path to illustrate the realization of weak negative coupling strength, and the second one has a normalized bandwidth of 8% with a negative coupling in one main coupling path to illustrate the realization of strong negative coupling strength. Finally, the two BPFs are fabricated and measured. Simulation and measurement results are in good agreement, which demonstrates the feasibility of the proposed negative coupling structure and its application on cross-coupled SIW filters with high performance. The influence of weak disperse cross coupling on locations of transmission zeros is also discussed.
- bandpass filter,
- substrate integrated waveguide,
- negative coupling,
- cross coupling,
- quasi-elliptic response,
- generalized Chebyshev response,
- coupling matrix synthesis

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References(21)

References

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