Bandwidth and center frequency adjustable three-passband filter based on single SIW cavity

Abstract

The invention discloses a bandwidth and center frequency adjustable three-passband filter based on a single multimode SIW cavity. The three-passband filter comprises a polygonal dielectric substrate,a metal layer is arranged on the upper surface of the dielectric substrate, and the lower surface of the dielectric substrate is provided with a metal grounding plate. The dielectric substrate is respectively provided with an input port feeder line and an output port feeder line, a central metal perturbation through hole, a first metal perturbation through hole group, a second metal perturbation through hole group, a first side metal perturbation through hole and a second side metal perturbation through hole are formed in the dielectric substrate, and a first rectangular perturbation groove and a second rectangular perturbation groove are etched in the upper surface metal layer.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a single multimode SIW cavity-based three-pass band filter with adjustable bandwidth and central frequency. Background technique [0002] Substrate Integrated Waveguide (SIW, Substrate Integrated Waveguide) technology is a planar waveguide technology proposed in recent years. It inherits the advantages of waveguide, such as low loss, high quality factor, and large power capacity, and also integrates the low profile of microstrip. , small size, and easy integration with other planar circuits. With the vigorous development of modern wireless communication technology, the use of a single multimode resonator to design a bandpass filter can meet the design requirements of miniaturization while obtaining high performance. Therefore, the perturbation of the resonator by introducing perturbation elements (including metal perturbation vias, rectangular perturbation slot...

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Problems solved by technology

However, relatively poor insertion loss and low return loss limit its application

[0005] Document 3 (A.R.Azad and A.Mohan, "Single-and Dual-Band Bandpass Filters Using a Single Perturbed SIW Circular Cavity," IEEE Microw.Wirel.Compon.Lett., 2019, 29, 3, pp. 201-203.) The first four resonant modes TM using the SIW circular cavity 010 、TM 110 and TM 210 A single and double passband filter is designed, but it cannot get a higher return loss

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