基于消失模耦合的脊波导滤波器设计方法

doi:10.16180/j.cnki.issn1007-7820.2020.03.004

Abstract

Abstract:

In the design of traditional ridged waveguide filter, the design precision is not high because of the lack of the frequency characteristics of the coupling structure. This paper presented a design method for the ridge waveguide filter with evanescent mode coupling. The rectangular waveguide working in the evanescent mode was equivalent to a frequency dependent impedance inverter model. By establishing an equivalent circuit model, the frequency variation of the coupling structure was converted to influence the reactance slope parameters of the resonator. The filter structure size was determined by the step by step simulation strategy to avoid the time-consuming full wave simulation optimization. Finally, a ridge waveguide filter with four orders Chebyshev response was designed. Full wave simulation results showed the same bandpass equiripple property as the theoretical design and verifyied the validity of the method.

Key words: filter, impedance inverter, reactance slope, resonator, evanescent mode, ridge waveguide

CLC Number:

TN713.5

LI Gang. Design Method of the Ridge Waveguide Filter with Evanescent Mode Coupling[J].Electronic Science and Technology, 2020, 33(3): 17-20.

Figures/Tables 7

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References 16

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消失模波导长度/mm	谐振腔长度/mm
L_c₀=4.952	L_r₀=10.00
L_c₁=11.28	L_r₁=8.53
L_c₂=12.66	L_r₂=7.42

Design Method of the Ridge Waveguide Filter with Evanescent Mode Coupling

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