C-band low-loss and high-inhibition micro band-pass filter
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A high suppression and low loss technology, applied in the field of filters, can solve the problems of large size and insertion loss, limitations, etc., and achieve the effects of low loss in the passband, low cost, and high out-of-band suppression
Inactive Publication Date: 2011-04-06
NANJING UNIV OF SCI & TECH
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Conventional filter design methods, such as hairpin filter structures, resonant cavity filter structures, and coaxial line filter structures, have large volume and insertion loss. , handheld wireless terminals, individual mobile communication terminals, etc.) are all subject to great restrictions
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[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0011] to combine figure 1 , figure 2 , image 3 , a C-band low-loss high-rejection miniature bandpass filter of the present invention, the C-band low-loss high-rejection miniature bandpass filter includes a surface-mounted 50-ohm impedance input port P1, an input inductance L6, and a first-stage parallel resonant unit L1, C1, first zero-point setting circuit L12, C12, second-level parallel resonance unit L2, C2, second zero-point setting circuit L23, C23, third-level parallel resonance unit L3, C3, third zero-point setting circuit L34, C34, fourth-level parallel resonant unit L3, C3, fourth zero point setting circuit L45, C45, fifth-level parallel resonant unit L5, C5, output inductor L7, surface-mounted 50-ohm impedance output port P2 and ground terminal , the input port P1 is connected to the input inductance L6, the output port P2 is connected to the ...
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Abstract
The invention relates to a C-band low-loss and high-inhibition micro band-pass filter which comprises an input interface and an output interface which are applicable to surface installation, five parallel resonance units realized by adopting two layers of folded coupling strip lines, four zero-point setting circuits, an input inductance and an output inductance, wherein the structures are realized by adopting a multilayer low-temperature co-fired ceramic process technology. The micro band-pass filter of the invention has the advantages of small volume, light weight, excellent electrical performance, high reliability, good linearity of phase-frequency characteristic, good temperature stability, fine batch consistency of electrical performance, low cost and the like, is suitable for mass production, is especially applicable to hand-hold and portable finished products for wireless communication, such as radars, communication, arrow loading, sky borne, missile borne, space ships, one-man mobile communication terminals, and the like as well as corresponding frequency range system with rigorous requirements on volume, weight, electrical performance, reliability and the like.
Description
technical field [0001] The invention relates to a filter, in particular to a C-band low-loss and high-suppression miniature band-pass filter. Background technique [0002] In 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, High stop band suppression Miniature microwave intermediate frequency band pass filter is the key electronic component in the receiving and transmitting branches of this band. 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 attenuation, shape factor, insertion phase shift and time delay frequency charact...
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