Deformed ellipsoidal resonant cavity and tuning-free dual-mode waveguide filter based on same

Abstract

The invention discloses a deformed ellipsoidal resonant cavity and a tuning-free dual-mode waveguide filter based on the same. The tuning-free dual-mode waveguide filter of the deformed ellipsoidal resonant cavity structurally comprises a first waveguide flange plate, a second waveguide flange plate and two dual-mode deformed ellipsoidal waveguide resonant cavities; the filter provided by the invention is improved on the basis of a dual-mode spherical resonant cavity filter. Based on the dual-mode spherical resonant cavity filter, the dual-mode resonant cavity is designed by utilizing a pair of polarization merger modes TM110 and TM011, sensitivity of processing error of the structure to dual-mode filter performance is reduced via the coupling and tuning structure, and a halfpace-shaped coupling structure is corrected into a hemispherical recess; the filter is easy to realize integrated processing, and subsequent debugging is not needed; in order to suppress stray generated by the other polarization merger mode TM101, four arc-shaped grooves which are symmetrical about the center of the ellipsoid are formed in the side wall of the dual-mode deformed ellipsoidal resonant cavity andused for suppressing a longitudinal TM101 mode in the deformed ellipsoidal resonant cavity, and therefore stray suppression of a stop band of the filter is achieved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a deformed ellipsoid resonant cavity and a dual-mode waveguide filter based on it without tuning. Background technique [0002] Due to the increasingly tight frequency spectrum and high data rate requirements of the communication system, the frequency of the communication system continues to expand to high frequency, and the frequency bands are more and more, the communication system is becoming more and more complex, and the performance of low loss, low cost, and miniaturization has become a requirement for mm The inevitable requirement of wave devices. The design of dual-mode or multi-mode filters achieves higher filter order and better filtering performance with the same volume. Therefore, dual-mode or multi-mode design is of great significance to the miniaturization and low cost of filters. However, in the design of multimode filters, due to the co...

AI Technical Summary

Problems solved by technology

However, due to the application of additive manufacturing technology is mostly based on resin material-based photocuring technology or metal material-based SLM technology, in addition to the usual processing errors, due to the shrinkage of the device structure during processing or the impact of the support material on the device structure influence, which causes further errors, which also brings difficulties to the processing of error-sensitive parts

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