Ku-wave band and ultra-narrow band micro band-pass filter with low loss and high inhibition
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A low-loss, high-rejection technology, applied in the field of filters, can solve the problems of large volume and insertion loss, and cannot be used in applications, and achieve the effect of relatively small bandwidth, light weight, and high reliability
Inactive Publication Date: 2011-04-06
NANJING UNIV OF SCI & TECH
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Filters designed by conventional methods, such as hairpin filter structures, resonant cavity filter structures, and coaxial line filter structures, all have the disadvantages of large volume and insertion loss, and are often unusable for demanding applications
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[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0011] combine figure 1 , figure 2 , image 3 , the Ku-band ultra-narrow-band low-loss high-suppression micro-bandpass filter of the present invention includes a surface-mounted 50-ohm impedance input port P1, an input inductance L5, first-stage parallel resonance units L1, C1, and a first electromagnetic coupling circuit L12 , C12, the second-level parallel resonance unit L2, C2, the second electromagnetic coupling circuit L23, C23, the third-level parallel resonance unit L3, C3, the third electromagnetic coupling circuit L34, C34, the fourth-level parallel resonance unit L3, C3 , the fourth electromagnetic coupling circuit L14, C14, the output inductor L6, the surface-mounted 50 ohm impedance output port P2 and the ground terminal, the input port P1 is connected to the input inductor L5, the output port P2 is connected to the output inductor L6, and the ...
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Abstract
The invention relates to a Ku-wave band and ultra-narrow band micro band-pass filter with low loss and high inhibition, which comprises an input / output interface, four parallel resonant units, a Z-shaped cross coupling circuit and an input and output inductor, wherein the input / output interface is suitable for surface mounting; the four parallel resonant units are realized by adopting two layers of folded coupling strip lines; and the structures are realized by adopting a multi-layer low-temperature co-fired ceramic (LTCC) process technology. The invention has the advantages of good band-passselectivity, good out-of-band inhibition, low insert loss, light weight, small volume, high reliability, good electrical performance, good phase frequency characteristic linearity, good temperature stability, good electrical performance batch consistency, low cost and the like, can realize large batch production, and is especially suitable for wireless communication handheld and portable terminalproducts such as radars, communication terminals, rocket-borne terminals, air-borne terminals, missile-borne terminals, space ships, individual mobile communication terminals and the like, and corresponding frequency band systems with strict requirements on volume, weight, electrical performance, reliability and the like.
Description
technical field [0001] The invention relates to a filter, in particular to a Ku-band ultra-narrowband low-loss and high-suppression miniature bandpass filter. Background technique [0002] With the development of microwave and millimeter wave communication, radar and other systems, especially in mobile handheld wireless communication terminals, individual satellite mobile communication terminals, military and civilian multi-mode multi-channel communication system terminals, airborne, missile-borne, aerospace communication systems With the continuous miniaturization of microwave and millimeter wave communication modules, band-pass filters are the key electronic components in the receiving and transmitting branches of corresponding bands, and micro-wave band-pass filters with ultra-narrow band and high stop-band suppression are an important development direction. The main technical indicators describing the performance of this component are: passband operating frequency range,...
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