Dielectric waveguide filter with defected ground loaded on magnetic coupling structure

Abstract

Provided is a dielectric waveguide filter with a defected ground loaded on a magnetic coupling structure. A row of metallized through holes is punched in each of two sides of a dielectric substrate, electromagnetic waves are limited to be spread in an area between the upper and lower metal surfaces of the dielectric substrate and the two rows of metallized through holes, and a dielectric waveguide transmission line is formed; two pairs of left-right symmetrical metallized through holes are formed in the formed dielectric waveguide transmission line and are perpendicular to the horizontal center line, the dielectric waveguide transmission line is divided into three parts which form dielectric waveguide resonant cavities, and the two pairs of left-right symmetrical metallized through holes form the magnetic coupling structure; double L-shaped transition structures are loaded from an input/output microstrip line to the upper layer metal surface of the dielectric waveguide transmission line to form transition from the microstrip line to the dielectric waveguide, and meanwhile a defected ground structure is loaded on the lower layer metal surface of the dielectric waveguide resonant cavities adjacent to the double L-shaped transition structures. The dielectric waveguide filter has the advantages of low insertion loss and high out-of-band rejection, and can be applied to fields such as the radio frequency front end, image rejection and spurious suppression.

Description

technical field [0001] The invention relates to a dielectric waveguide filter with a defect-loaded magnetic coupling structure, belongs to the field of microwave engineering, and is a microwave passive device. Background technique [0002] The integrated dielectric waveguide filter is a relatively new microstrip planar filter. It uses a microstrip line to punch a metallized through hole to form a planar waveguide structure. accomplish. It inherits the advantages of low loss, high quality factor, and large power capacity of waveguide, and also combines the advantages of low profile, small size, and easy integration with other planar circuits of microstrip. [0003] The defect grounding structure is to change the distribution of the grounding current by artificially etching periodic or non-periodic small holes on the grounding metal plane of the microwave circuit, thereby changing the frequency characteristics of the transmission line, so that electromagnetic waves of certain...

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Problems solved by technology

However, the disadvantage of this filter structure is that the high-end out-of-band suppression is not very high, especially in the application of transceiver suppression and image rejecti

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