A Broadband Filter Based on Substrate Integrated Waveguide

Abstract

The invention discloses a broadband filter based on a substrate integrated waveguide, which comprises a dielectric substrate, a lower metal layer of the dielectric substrate, and an upper metal layer of the dielectric substrate. Holes, the through holes are arranged in a rectangular shape to form a resonant cavity; the left and right sides of the upper metal layer are respectively etched with the first waveguide transmission line and the second waveguide transmission line for feeding the resonant cavity, and the first waveguide The middle metal strips of the transmission line and the second waveguide transmission line respectively extend to the outside, that is, to the left and right sides respectively to become the first input feed microstrip line and the first input feed microstrip line; the first input feed microstrip line The strip line and the first input feeding microstrip line are arranged at a position where the center of the resonant cavity is shifted downward, and the first input feeding microstrip line and the first input feeding microstrip line are left-right symmetrical. The invention has the characteristics of low loss, low radiation and high power capacity, and at the same time reduces volume and saves cost due to the use of a single cavity.

Description

technical field [0001] The invention relates to the field of microwave technology, in particular to a broadband filter based on a substrate integrated waveguide. Background technique [0002] Since the concept of substrate-integrated waveguides was proposed, it has received extensive attention from scholars at home and abroad. The substrate-integrated waveguide consists of upper and lower metal surfaces, a dielectric plate between the metals, and metallized vias connecting the metal plates on both sides. This planar structure can be realized through the PCB process. Compared with the microstrip structure with a similar process, the substrate integrated waveguide inherits most of the advantages of the traditional dielectric filled rectangular waveguide, such as low insertion loss, small radiation, etc., and also has many advantages of the microstrip structure, such as low profile , easy processing, easy integration, etc. These advantages of substrate-integrated waveguides m...

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Problems solved by technology

[0003] The existing broadband filter structures based on substrate-integrated waveguides at home and abroad are mostly realized by coupling multiple cavities, which are large in size and high in cost. In addition, there are problems of high loss, low integration, and small power capacity.

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