Wideband coaxial resonant cavity

Abstract

The invention provides a wideband coaxial resonant cavity. The wideband coaxial resonant cavity comprises an outer conductor, an inner conductor, an upper end cover and a lower end cover, wherein the inner conductor is coaxially arranged in the outer conductor, the upper end cover is arranged above the outer conductor, the lower end cover is arranged at the bottom of the outer conductor, the inner conductor, the outer conductor, the upper end cover and the lower end cover form a coaxial resonant cavity, two through holes are symmetrically formed in a lower end of a side wall of the outer conductor around a central axis of the resonant cavity, coupling rings are inserted to the through holes, a plurality of groove bodies are circumferentially and uniformly arranged on an outer surface of the side wall of the outer conductor and vertically extend towards the center of the resonant cavity, the depth of each groove body is smaller than the thickness of the side wall of the outer conductor, a gap is arranged in each groove body and extends to an inner wall of the outer conductor, the width of the gap is smaller than that of the groove body, and the interior of the groove body is filled with a wave absorption material covering the gap. With the adoption of the abovementioned scheme, a large of parasitic modes can be effectively suppressed, a main mode is easier to recognize, particularly, the effect is more obvious in a relatively high frequency range, the frequency spectrum of a relatively pure TEM00p mode in a relatively wide frequency band range of 0.6-13.5GHz can be finally obtained, and more than ten discrete frequency points are covered.

Description

technical field [0001] The invention belongs to the field of microwave technology, and in particular relates to a 00p mode broadband coaxial resonator. Background technique [0002] TEM 00p The mode coaxial resonant cavity is a microwave resonant cavity, which can be used for microwave detection, measurement of electrical parameters of dielectric materials, design of microwave broadband coaxial filter, etc. It works in TEM mode, with simple oscillation mode and stable field structure , No dispersion, wide operating frequency and other advantages. common TEM 00p The coaxial resonator is machined from brass, and the inner surface is silver-plated to improve the inherent quality factor of the cavity. The coupling ring is used to excite the strongest magnetic field on the lower side of the cavity wall to generate resonance in the cavity. Different p can be selected to obtain different main mode resonance frequencies, and then multiple TEM 00p Working mode, that is, the use...

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Problems solved by technology

However, there are still a large number of interference modes in the working frequency band at this time, which severely limits the available bandwidth. Therefore, how to design a wide-band coaxial cavity to suppress the interference modes as much as possible without affecting the working mode can be compared. "Clean" TEM 00p Mode spectrum, a difficult problem in coaxial cavity design

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