高性能双通带滤波器的快速设计方法

doi:10.19665/j.issn1001-2400.2020.05.017

Abstract

Abstract:

In this paper, in order to improve the efficiency of designing the dual-passband filter, the extraction method of the coupling matrix of the dual-passband filter is studied based on the duplexer theory, and a dual-passband cavity filter is designed. First, the basic theory of the coupling matrix is analyzed, and then the method for extracting the coupling matrix based on the duplexer is studied. Finally, the corresponding coupling matrix is verified theoretically by the circuit model, and the design and simulation of the filter are performed using electromagnetic simulation software. The simulation results show that the dual-passband filter designed in this paper has the characteristics of a flexible and controllable passband, a low insertion loss, and good out-of-band rejection. The proposed method can improve the efficiency of designing the dual-passband filter.

Key words: diplexer, dual-passband filter, coupling matrix

CLC Number:

TN802

XU Tongtong,XIANG Zheng. Fast design method for the high-performance dual-passband filter[J].Journal of Xidian University, 2020, 47(5): 130-136.

Figures/Tables 8

References 16

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指标名称	指标值	与设计指标吻合程度
通带频率/GHz	1.98~2.09 2.18~2.30	吻合
回波损耗/dB	≥17	吻合
插入损耗/dB	≤0. 5	吻合
带外抑制	≥40 dB @(1.9 GHz) ≥40 dB @(2.39 GHz) ≥30 dB @(2.15 GHz)	优于设计指标

Fast design method for the high-performance dual-passband filter

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References 16

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[1]	LI Gang. Matrix optimization synthesis method for the cross-coupled filter with frequency dependent couplings [J]. Journal of Xidian University, 2019, 46(3): 154-159.
[2]	CHEN Jianzhong;LIANG Changhong;CHEN Jia;LI Qi. Parameter extraction method for microwave filters based on the curve fitting technique [J]. J4, 2011, 38(4): 101-105+123.
[3]	HAN Ying-bin1;ZHAO Yong-jiu1;LU Hong-min2. Coupling matrix method for diagnosis and tuning of microwave filters [J]. J4, 2008, 35(4): 703-706.