Miniature filter with low loss, high stop band and multi-zero suppression

Abstract

The invention relates to a 6.8-kilomegahertz miniature filter with low loss, high stop band and multi-zero suppression, which comprises an input port, an output port, three parallel resonance units, two zero setting units, and the like, which are achieved by adopting a multi-layer low temperature co-fired ceramic technology, wherein an input inductor and an output inductor are designed by distributed parameter strip lines; a first inter-stage inductor and a second inter-stage inductor adopt space coupling and distributed parameter inductors; a first inter-stage capacitor and a second inter-stage capacitor adopt space coupling and distributed parameter capacitors; a first coupling capacitor is a medium flat Z-shaped capacitor; the three parallel resonance units are designed by two layers of folded and coupled strip lines, and one end of each layer of strip line is hung in air, and the other end is grounded. The invention has the advantages of small volume, light weight, high reliability, good temperature performance stability, excellent electrical performance, high yield, low cost and good bulk electrical performance consistency.

Description

Technical field [0001] The invention relates to a filter, in particular to a low-loss high-stop band suppression multi-zero micro filter. Background technique [0002] In microwave communication systems, radars and other systems, especially mobile handheld wireless communication terminals and individual satellite mobile communication terminals, military and civilian multi-mode and multi-channel communication system terminals, airborne, missile-borne, and aerospace communication systems, 6.8 Gigahertz, low-loss, high-stop-band suppression and multi-zero micro-filters are key electronic components in the receiving and transmitting branches of this band, and their performance often directly affects the performance indicators 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...

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×8mm); 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 the volume can be Reduced, but its electrical performance has the disadvantage of temperature drift, and high cost, large insertion loss, which is greatly restricted in applications with high temperature stability requirements and low insertion loss requirements

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