A substrate-integrated waveguide microwave tunable filter based on liquid crystal material

Abstract

The invention discloses a substrate-integrated waveguide microwave tunable filter based on liquid crystal material, which belongs to the technical fields of wireless communication, satellite communication, radar system, etc., and specifically relates to a filter based on liquid crystal material. Solve the problem of leakage of liquid crystal material in the existing packaging process, solve the problem of impedance mismatch by means of interlayer through-hole interconnection and strip line ladder impedance transformation, use direct contact feeding to add modulation voltage, through The split resonant ring structure is etched on the metal layer on the upper surface of the chip integrated waveguide to realize the bandpass filter, and the metal layer on the upper surface of the chip integrated waveguide is inverted and in contact with the liquid crystal material to form a substrate integrated waveguide tunable filter based on the liquid crystal material. It solves the problem of liquid crystal leakage in the traditional packaging method, and has the effects of impedance matching and frequency response of the filter being continuously adjustable.

Description

technical field [0001] The invention belongs to the technical fields of wireless communication, satellite communication, radar system, etc., and in particular relates to a filter based on liquid crystal material. Background technique [0002] With the rapid development of modern wireless communication technology, the application of wireless communication technology is becoming more and more numerous, and the problem of frequency resource shortage is becoming more and more prominent. More and more application environments require the circuits used in them to have high performance, high integration, frequency tunability, Multi-band, low-cost and other characteristics, thereby improving the utilization of spectrum resources. The tunable filter is the key device to realize frequency selection, distribution and other technologies. Therefore, light weight, small size, low tuning voltage, fast tuning speed, wide tuning range, low loss, high quality factor, large power capacity, an...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a new packaging and design method of a substrate-integrated waveguide microwave tunable filter based on liquid crystal materials, to solve the problem of leakage of liquid crystal materials in the existing packaging process, and to interconnect and The strip line step impedance transformation method solves the problem of impedance mismatch. Direct contact feeding is used to add modulation voltage. The bandpass filter is realized by etching the split resonant ring structure on the metal layer on the upper surface of the integrated waveguide on the substrate. The metal layer on the upper surface of the substrate integrated waveguide is inverted and in contact with the liquid crystal material to form a substrate integrated waveguide tunable filter based on the liquid crystal material

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