Substrate integration waveguide high-pass filter

Abstract

The invention discloses a substrate integration waveguide high-pass filter. The substrate integration waveguide high-pass filter comprises a half-module substrate integration waveguide high-pass filter and a band rejection filter. The half-module substrate integration waveguide high-pass filter comprises a metal paster, a medium substrate and metal through holes. The metal paster is arranged on the surface of the medium substrate. A rectangular paster is arranged in the middle of the metal paster, the two edges of the metal paster are changed into micro-strip lines through trapezoid micro-strip gradually-changed lines in a transition mode, the micro-strip lines are connected with the input end and the output end respectively, and the row of metal through holes are formed along one side edge in the rectangular paster. The band rejection filter is arranged at the input end of the rectangular paster, and comprises two corner micro-strip branch lines along the micro-strip lines from the input end in sequence. The two corner micro-strip branch lines each comprise a head section and a tail section which are perpendicular to each other to form an L shape. The head sections are vertically connected with the corresponding micro-strip lines, and tail sections are arranged oppositely. The upper sideband of the band rejection filter is the cut-off frequency of the half-module substrate integration waveguide high-pass filter. The filter guarantees good out-of-band rejection, and the return loss in half bandwidth is small.

Description

A technical field [0001] The invention relates to the technical field of microwave filters, in particular to a substrate-integrated waveguide high-pass filter. Two background technology [0002] With the rapid development of wireless communication technology, spectrum resources are becoming more and more scarce, the operating frequency of the system is getting higher and higher, and its relative bandwidth is getting narrower and narrower. In this way, practical applications have increasingly stringent requirements on the working quality and frequency band of microwave systems, while circuits such as microstrip lines have relatively large losses, low quality factors, high electromagnetic radiation and crosstalk, concentrated natural heat sources, and limited power capacity, etc. Inadequacies in many aspects are becoming more and more obvious. Therefore, it is very important to propose some new microwave and millimeter wave circuit forms and integration technologies that are ...

AI Technical Summary

Problems solved by technology

[0004] The substrate integrated waveguide itself has high-pass characteristics, but the passband characteristics are not easy to control and adjust

In order to reduce the size of the device, the concept of half-mode substrate-integrated waveguide is proposed. Although the size is reduced by half, it can still realize the function of the entire substrate-integrated waveguide. The half-mode substrate-integrated waveguide high-pass filter also has unbalanced bands. The disadvantages of external suppression and return loss in the passband are not easy to control and adjust

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