Quarter structure substrate integrated waveguide double-pass live tuned filter

Abstract

The invention provides a quarter-structure substrate integrated waveguide double-pass charged tuning filter, which includes a dielectric substrate, a quarter copper clad structure on the upper surface of the dielectric substrate, and a lower layer of metal copper on the lower surface of the dielectric substrate; A copper-clad structure is provided with metallized through-holes that form the substrate integrated waveguide. The lower left side of the quarter-clad copper-clad structure is a 50-ohm input microstrip line, and the right side of the L-shaped groove inside the quarter-clad copper-clad structure is A complementary square spiral resonant ring; on the right side of the 50 ohm transitional microstrip line is a large square metal plane, with an inverted concave punched metal sheet in the center of the large square metal plane, with a central via hole in the center, and a quarter of copper clad There are six square metal pads under the structure and 50 ohm input microstrip line. The filter has the advantages of small size, low insertion loss, continuously adjustable center frequency, high out-of-band rejection, convenient loading of DC feed, fast tuning speed, tuning Features such as convenience.

Description

technical field [0001] The invention relates to the field of microwave and millimeter wave technology, in particular to a quarter-structure substrate integrated waveguide double-pass charged tuning filter. Background technique [0002] With the continuous development of modern wireless communication, there are a large number of wireless communication services in different frequency bands, especially with the development of software radio technology, there is an urgent need to develop an RF front-end with multi-band coverage and tunable functional characteristics. The RF filter is an important part of the RF front-end of wireless communication. It is widely used to suppress the RF signal outside the frequency band to achieve the purpose of frequency band selection, suppress image interference, and reduce intermodulation distortion. It has the characteristics of tunable frequency response. Radio frequency modulation filters will be an important support for future wireless comm...

AI Technical Summary

Problems solved by technology

The traditional solution is to use radio frequency switches to select filters with corresponding indicators, which imposes a burden on the volume and cost of the communication system, and as more and more communication systems need to be integrated, switchable filters are becoming more and more impossible Pick

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