Parameter determination method of rectangular waveguide lowpass

Abstract

The invention discloses a parameter determination method of a rectangular waveguide lowpass, belonging to the technical field of electric elements and mainly solving the problem of the design precision of the rectangular waveguide lowpass. The parameter determination method comprises the following steps: firstly, selecting a rectangular waveguide model according to an electrical property index ofthe rectangular waveguide lowpass and initially determining the structural parameters of a rectangular waveguide electrical length and a rectangular waveguide capacitive diaphragm; then, utilizing Jonathan Schwartz-Christopher inverse transform to solve an S' matrix of the rectangular waveguide capacitive diaphragm through an improved hybrid genetic algorithm; then utilizing genetic algorithm optimization to approximately equalize the S' matrix and an S matrix obtained by a generalized impedance conversion coefficient K so as to finally determine the structural parameter of the rectangular waveguide capacitive diaphragm; and finally, utilizing the S' matrix of the rectangular waveguide capacitive diaphragm to correct the waveguide length between two diaphragms so as to finally determine the cavity length of a rectangular waveguide. The invention can accurately determine the parameters without repeated debugging and can be used for designing the rectangular waveguide lowpass with high precision.

Description

technical field [0001] The invention belongs to the technical field of electrical components, in particular to a method for determining parameters of a rectangular waveguide low-pass filter, which is used to guide the design of a high-performance rectangular waveguide low-pass filter. Background technique [0002] In the design of rectangular waveguide low-pass filter, the low-pass prototype circuit is first obtained from the electrical performance index of the filter, and then the generalized impedance converter K is obtained by circuit transformation, and finally the impedance converter and branch components of the circuit are realized by waveguide microwave structure, including Coupling capacitor diaphragm design and transmission section waveguide design. For a rectangular waveguide low-pass filter that uses a capacitive diaphragm to achieve coupling, it is a very critical step to design the parameters of the capacitive diaphragm according to the generalized impedance tra...

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Problems solved by technology

[0021] 2) Variational method does not take factors such as diaphragm thickness and processing inclination into consideration

[0022] 3) Mode matching is mainly to analyze microwave devices with regular geometric structures, and there is no accurate analysis for irregular deformations such as inclination angles.

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