A dual-mode siw filter with adjustable frequency, bandwidth and zero point

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...

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