Fourth-order dielectric integrated waveguide filter based on galvanic coupling

Abstract

The invention discloses a fourth-order dielectric integrated waveguide filter based on galvanic coupling. The filter comprises a three-layer structure which includes a metal signal layer, a dielectric substrate and a metal ground layer from top to bottom, wherein the metal signal layer includes a first transmission line unit, a second transmission line unit, a first rectangular slot, a second rectangular slot, a third rectangular slot, a fourth rectangular slot, a fifth rectangular slot, a sixth rectangular slot, a seventh rectangular slot, and two columns of parallel and equidistantly-arranged metal via holes which extend from the metal signal layer to the metal ground layer. A zero point is generated by disposing the rectangular slots on the metal layer of the dielectric integrated waveguide filter, the fourth rectangular slot and the fifth rectangular slot are symmetrical about an intermediate horizontal axis, and the sixth rectangular slot and the seventh rectangular slot are symmetrical about the intermediate horizontal axis, thereby suppressing the generation of higher-order modes. The fourth-order dielectric integrated waveguide filter has good out-of-band suppression, simple structure, and a small size.

Description

technical field [0001] The invention belongs to the technical field of microwave transmission devices, in particular to a fourth-order dielectric integrated waveguide filter based on an electrical coupling technology. Background technique [0002] SIW filters are widely used in microwave circuits because of their high Q value, low loss, easy processing, and easy planar integration. In 2003, Professor Wu Ke of the University of Montreal in Canada realized the design of the Ka-band Chebyshev filter by adding ordered metal through holes in the SIW, and many scholars joined the research on the SIW filter. At present, the development direction of SIW filter mainly has the following directions: from the passband, multi-passband, ultra-wideband, high frequency; from the size, miniaturization, device integration. [0003] Sai Wai Wong first proposed an SIW filter based on electrical coupling technology in 2013, but the filter has insufficient out-of-band suppression and a small Q v...

AI Technical Summary

Problems solved by technology

[0003] Sai Wai Wong first proposed the SIW filter based on electrical coupling technology in 2013, but the out-of-band suppression of the filter is insufficient and the Q value is small

In 2017, Ming Dong of Yunnan University used the method of combining electric coupling and magnetic coupling to generate two zero points, thus obtaining better out-of-band suppression, but its return loss is poor, and there are resonance points near the frequency band, how to Designing a filter with good out-of-band rejection has become one of the current research hotspots

Images