A method and device for impedance matching of a transverse electromagnetic wave chamber

Abstract

The invention discloses a transverse electromagnetic wave cell impedance matching method and device which are capable of meeting the requirement of small standing waves in a total TEM cell working frequency band range. The device comprises an inner conductor and an outer conductor, wherein the bus shape of the inner conductor and / or the bus shape of the outer conductor is an index gradual change line with a gradient. The method provided by the invention comprises the following steps of: establishing an impedance matching structure parameterization model; setting boundary conditions and material parameters of the impedance matching device, adjusting gradients of the inner and outer conductors, index coefficients and the distance between discontinuous surfaces of the inner and outer conductor, carrying out simulation calculation on an electromagnetic field, and using a parameter S as an optimization target until optimal coefficients and an optimal distance are obtained. According to the invention, echoes of electromagnetic waves transmitted in a TEM cell are fewer, the energy loss is small, and the standing waves in the working frequency band range are smaller than 1.2.

Description

technical field [0001] The invention relates to the field of electromagnetic field testing, in particular to an impedance matching method and device for a concentric conical transverse electromagnetic wave (TEM) chamber. Background technique [0002] The concentric conical TEM chamber is a field strength generating device based on the standard field method and has a wide operating frequency band. The impedance matching device of the concentric conical TEM chamber is to match the 50Ω impedance of the coaxial line at the feeding point to the characteristic impedance of the concentric conical TEM transmission section. At present, the impedance matching device connecting the coaxial structure and the conical structure usually adopts multi-section Impedance gradual change, this multi-section impedance transformation method can usually only be used for impedance matching design with narrow working bandwidth, although the more the number of sections, the wider the matching bandwidt...

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a TEM room impedance matching method and device, which solves the problem that the traditional impedance matching method cannot realize impedance matching in the whole frequency band, and can realize the requirement that the standing wave in the whole frequency band is less than 1.2 within the working frequency range of the TEM room

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