Half mode substrate integration waveguide horizontal symmetrical filter

Abstract

The invention discloses a half mode substrate integration waveguide horizontal symmetrical filter small in size. According to the filter, source and a load coupling is introduced between a source and a load through a fifth sensing coupling window arranged between an input end and an output end, two transmission zeroes out of a band can be achieved only by using two half film resonant cavities. In comparison with a traditional substrate integration waveguide filter which needs four resonant cavities to achieve the two transmission zeroes, the half mode substrate integration waveguide horizontal symmetrical filter reduces the size by a half while original selectivity is maintained, the two transmission zeroes can be flexibly adjusted and controlled according to actual demands, and the actual system requirements are met. In addition, the first resonant cavity of the filter works in a TE102 mode, the second resonant cavity works in a TE101 mode, the areas of the two resonant cavities are only a half of those of traditional square resonant cavities, the plane size of the filter is effectively reduced, and system integration is facilitated. The half mode substrate integration waveguide horizontal symmetrical filter is suitable for popularization and application in the technical field of microwave millimeter waves.

Description

technical field [0001] The invention relates to the field of microwave and millimeter wave technology, in particular to a half-mode substrate integrated waveguide transverse symmetric filter. Background technique [0002] The filter is one of the key passive components in the whole system, and its performance directly affects the quality of the whole system. Microwave and millimeter waves generally use metal waveguide filters and filters based on planar circuits such as microstrip lines and coplanar lines. Metal waveguide filters have the advantages of high Q value, low loss, and good selectivity, but they are bulky, expensive, difficult to process, and difficult to integrate with active circuits. Although filters based on planar circuit technologies such as microstrip lines and coplanar lines are easy to integrate with active circuits, they usually have disadvantages such as large loss and low Q value, especially poor performance. Radiation is also easy to cause spatial c...

AI Technical Summary

Problems solved by technology

Substrate-integrated waveguide technology is a new type of waveguide structure with low insertion loss and low radiation that can be integrated into a dielectric substrate proposed in recent years. The substrate-integrated waveguide filter not only has the similar performance of traditional metal waveguide filters performance, and has the advantages of small size, light weight, easy integration, etc., but the increase of the transmission zero point of the existing substrate integrated waveguide filter requires multiple resonant cavities. For example, if two transmission zero points are realized, four Only one resonant cavity can be realized, and the volume of the whole substrate integrated waveguide filter is relatively large, which is not conducive to system integration

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