Half-mode substrate integrated waveguide filter

Abstract

The invention relates to a half-mode substrate integrated waveguide filter, which belongs to the technical field of wireless communication and comprises a dielectric substrate, cavity top layer metal and cavity bottom layer metal are respectively arranged on the upper end surface and the lower end surface of the dielectric substrate; a plurality of groove-shaped structures are etched on the top layer metal of the cavity to form a plurality of resonators, the plurality of resonators are connected through coupling metal bands to realize magnetic coupling, and electric coupling is realized through the sizes of gaps between the coupling metal bands and the groove-shaped structures; the resonators at the left end and the right end of the top metal of the cavity are connected with an input port and an output port, and the plurality of resonators are mixed and coupled and form a pass band of the filter during resonance, so that the function of band-pass filtering is realized. According to the invention, four resonators are obtained by etching a groove-shaped structure on the top metal, so that a band-pass filtering function is realized; hybrid electromagnetic coupling is realized between resonators, a transmission zero point is introduced, out-of-band rejection and frequency selectivity are improved, and the stop-band bandwidth is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a half-mode substrate integrated waveguide filter. Background technique [0002] The great development of wireless communication technology has greatly promoted the development of bandpass filters with low cost, small size, good frequency selectivity and wide suppression range. For base stations, waveguide structures are widely used due to their low loss, high power capacity, and high quality factor, which dominate filter design. In the past ten years, substrate integrated waveguide (SIW) can meet the design requirements of high-performance filters due to its low cost, light weight, low insertion loss, convenient processing, and good compatibility with other planar circuits. Extensive research and applications. [0003] In order to further reduce the size of the filter, a half-mode substrate integrated waveguide (HMSIW) filter is proposed. This structure can redu...

AI Technical Summary

Problems solved by technology

Rectangular waveguides are bulky, expensive, and difficult to integrate with other planar structures

Compared with the rectangular waveguide, the substrate integrated waveguide is lighter in weight, easy to process and better compatible with other planar structures, but the circuit area is still large

The half-mode substrate-integrated waveguide further reduces the size on the basis of the substrate-integrated waveguide, but it also has the disadvantages of low quality factor and low power capacity

Compared with the filter using the hybrid coupling method, the bandpass filter using the single coupling method cannot introduce the transmission zero point caused by the hybrid electromagnetic coupling, resulting in worse frequency selectivity and lower out-of-band rejection. The corresponding stopband width will be narrower

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