A ku-band ultra-narrowband microstrip bandpass filter

Abstract

The invention proposes a Ku-band ultra-narrowband microstrip bandpass filter. It includes a microstrip substrate, the reverse side of the microstrip substrate is used as a grounded metal plate, the first input / output port and the second input / output port are distributed on both sides of the microstrip substrate, and a first uniform transmission line unit is arranged on the front of the microstrip substrate , the second uniform transmission line unit, the first coupled feeder, the second coupled feeder, the third coupled feeder, the fourth coupled feeder, the first open branch, the second open branch, the first folded L-shaped structural unit, the second folded L-shaped Structural unit, rectangular structural unit, third open branch, fourth open branch. The invention has good passband selectivity, high out-of-band suppression, small size, light weight, planarization and low cost.

Description

technical field [0001] The invention belongs to the technical field of microwave transmission devices, in particular to a Ku-band ultra-narrowband microstrip bandpass filter. Background technique [0002] With the development of microwave and millimeter wave communication, radar and other systems, microstrip circuits are widely used in modern communication systems due to their advantages such as small size, light weight, wide frequency band, and easy matching with radio frequency circuits. Ku-band ultra-narrowband microstrip bandpass filter is a key electronic component in the way of receiving and transmitting in this band, and its performance often affects the performance index of the entire communication system. Therefore, Ku-band ultra-narrowband filters with small size, light weight, planarization, good in-band selectivity, and high out-of-band rejection have strong theoretical significance and engineering application value. [0003] Existing literature reports ultra-na...

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Problems solved by technology

[0004] Document 1 (Zhao, G.Q., Z.Zhang, X.Lv, and H.J.Sun, A Ku Band Waveguide BandpassFilter With E-plane Metallic Diaphragm, Microwave and Millimeter WaveTechnology (ICMMT), 2010:875-877) uses waveguide form Design a Ku-band bandpass filter, although the insertion loss is small and the structure is simple, but the size is large, and the center frequency and bandwidth are not easy to adjust;

[0005] Document 2 (Guo, Z.Q., Q.Chen, and Y.Fan, A Compact Ku-Band Filter Based OnSubstrate Integrated Circular Cavity, Intelligent Signal Processing and Communication Systems (ISPACS), 2010:1-3) uses the integrated dielectric waveguide form Design a Ku-band bandpass filter, although the size is reduced, but the processing difficulty and production cost are increased, and the selectivity of the passband is not ideal;

[0006] Document 3 (Jiang, S.L., J.M.Zhou, and J.Zhou., A LTCC-Based Ku-band3D BandpassFilter Using Stepped-Impedance Hairpin Resonators, Microwave and MillimeterWave Technology (ICMMT), 2012:1-4) uses low temperature co- A Ku-band band-pass filter is designed in the form of ceramic firing technology. Although the volume is small and the performance is good, the structure is not easy to integrate in the microwave circuit module, and the out-of-band rejection is not high;

[0007] To sum up, Document 1 designs a Ku-band bandpass filter in the form of a waveguide. Although the insertion loss is small and the structure is simple, the overall size is large; in Document 2, a Ku-band bandpass filter is designed in the form of an integrated dielectric waveguide. Although the volume of the band-pass filter is reduced, it increases the processing difficulty and production cost; in Document 3, a Ku-band band-pass filter is designed by using low-temperature co-fired ceramic technology. Although the volume is small, the performance Very good, but this structure is not easy to integrate in the microwave circuit module; moreover, the band-pass filters of the Ku-band designed in Documents 1, 2 and 3 are all broadband Ku-band band-pass filters

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