Dual-mode SIW filter capable of realizing frequency and bandwidth and zero-point adjustability

Abstract

The invention belongs to the technical field of filters, and discloses a dual-mode SIW filter capable of realizing frequency and bandwidth and zero-point adjustability. The dual-mode SIW filter is composed of an upper metal surface, an intermediate medium substrate and a lower metal bottom surface, and is composed of a square substrate integrated waveguide dual-mode resonant cavity; and frequencyadjustability, bandwidth reconfigurability and zero point controllability of the filter are realized by utilizing the simple-parallel mode of the square cavity; the overlarge size caused by direct coupling cascade connection of multiple cavities can be avoided; the problem that the insertion loss is relatively high is solved, and the size of the whole filter is relatively compacted; two transmission zero points are introduced to the two sides of the filter passband, so that the selectivity and out-of-band rejection of the filter are improved; the frequency adjustability is realized in a wide frequency band, and the bandwidth reconfigurability and zero point controllability are realized, so that the functions can be realized only in a single cavity by changing the different capacitance values of five variable capacitance diodes.

Description

technical field [0001] The invention belongs to the technical field of filters, in particular to a dual-mode SIW filter with adjustable frequency, bandwidth and zero point, that is, a dual-mode substrate integrated waveguide (SIW) filter with adjustable frequency, bandwidth and zero point , which is suitable for realizing adjustable frequency, reconfigurable bandwidth and controllable zero point of the filter. Background technique [0002] With the rapid development of wireless communication systems and technological changes, filters, as one of the important communication components, have always been a research hotspot for microwave and radio frequency engineers. Especially with the coming of the 5G era, high-performance filters in corresponding frequency bands will usher in Explosive demand growth; substrate-integrated waveguide technology is a new type of transmission line structure that uses metallized through-holes to realize waveguide mode propagation on dielectric subs...

AI Technical Summary

Problems solved by technology

[0008] For the problems existing in the above-mentioned prior art, the purpose of the present invention is to propose a dual-mode SIW filter that realizes frequency and bandwidth and zero point adjustable, and this kind of dual-mode SIW filter that realizes frequency and bandwidth and zero point adjustable utilizes The degenerate mode of the square cavity realizes the adjustable frequency, reconfigurable bandwidth and controllable zero point of the filter, which can avoid the problems of large size and large insertion loss caused by direct coupling and cascading of multiple cavities. The size of the whole filter is relatively compact; and two transmission zeros are introduced on both sides of the passband of the filter, which increases the selectivity and out-of-band rejection of the filter

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