L-waveband broadband multi-zero micro-filter

Abstract

The invention discloses an L-waveband broadband multi-zero micro-filter. The L-waveband broadband multi-zero micro-filter comprises an input / output interface mounted on the surface, five parallel resonant units realized by adopting three layers of folding coupling strip lines, four zero setting units, a Z-shaped cross-coupling circuit, and input and output inductors, wherein each element is realized by adopting the technique of three layers of low-temperature co-fired ceramic, and the input and output inductors are designed based on strip lines of distributed parameters. According to the L-waveband broadband multi-zero micro-filter disclosed by the invention, the design process of the circuit topology is simple, the manufacturing process is simple and convenient, the working band is wide, the insertion loss is low, the chip is small, the phase-shifting precision is high, and the standing wave ratio of the input voltage to the output voltage is small. The L-waveband broadband multi-zero micro-filter specially applies to communication of related microwave frequency bands, the digital radar, individual satellite mobile, military and civilian multi-mode and multi-way communication system terminals, wireless communication handhold terminals, as well as related systems with harsh requirements in volume, weight, performance and reliability.

Description

technical field [0001] The invention relates to a filter, in particular to an L-band broadband multi-zero miniature filter. Background technique [0002] With the development of microwave and millimeter wave communication, radar and other systems, especially mobile handheld wireless communication terminals, individual satellite mobile communication terminals, military and civilian multi-mode and multi-channel communication system terminals, airborne, missile-borne, and aerospace communication systems Among them, the broadband multi-zero micro-bandpass filter is the key electronic component in the receiving and transmitting branches of this band, and its performance often directly affects the performance index of the entire communication system. The main technical indicators describing the performance of this component are: passband operating frequency range, stopband frequency range, passband input / output voltage standing wave ratio, passband insertion loss, stopband attenua...

AI Technical Summary

Problems solved by technology

Conventional design and manufacturing methods are at the low end of microwave frequency (300MHz~1GHz). Due to the long wavelength (wavelength 0.3m to 1m), the volume of the filter is proportional to the working wavelength, so the volume is relatively large (generally about 45mm× 32mm×8 mm); such as filters made of metal resonators, microstrip line filters, block dielectric filters, etc., are too large to meet the requirements of miniaturization; and the use of surface acoustic wave filter technology, although volume It can be reduced, but its electrical performance has the disadvantage of temperature drift, high cost and large insertion loss, which are greatly restricted in applications with high temperature stability requirements and low insertion loss requirements

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