Substrate integrated waveguide microwave tunable filter based on liquid crystal material

Abstract

The invention discloses a substrate integrated waveguide microwave tunable filter based on a liquid crystal material, wherein the substrate integrated waveguide microwave tunable filter belongs to the technical fields of wireless communication, satellite communication, radar system, etc. Particularly the invention relates to a filter based on the liquid crystal material. The filter settles a problem of liquid crystal material leakage in an existing packaging process. The filter settles a problem of impedance mismatch in manners of interlayer through hole interconnection and strip line stepped impedance transformation. A modulating voltage is added through direct contact type feeding. A bandpass filter is realized through etching an open resonance ring structure on an upper-surface metal layer of a substrate integrated waveguide. The upper-surface metal layer of the substrate integrated waveguide is reversed for contacting with the liquid crystal material, thereby forming the substrate integrated waveguide tunable filter based on the liquid crystal material. The substrate integrated waveguide microwave tunable filter settles the problem of liquid crystal leakage in a traditional packaging method and has effects of impedance matching and continuous adjustable frequency response of the filter.

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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