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Microstrip low-pass filter, transmission zero point determination method and transmission zero point frequency setting method

A low-pass filter and transmission zero technology, applied in the field of communication systems, can solve the problems of unfavorable system miniaturization and large circuit size, etc.

Active Publication Date: 2021-09-10
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome the deficiencies in the prior art, provide a kind of microstrip low-pass filter and transmission zero point determination, frequency setting method, solve the circuit size of the microstrip low-pass filter in the prior art is bigger, is not conducive to System miniaturization technical issues

Method used

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  • Microstrip low-pass filter, transmission zero point determination method and transmission zero point frequency setting method
  • Microstrip low-pass filter, transmission zero point determination method and transmission zero point frequency setting method
  • Microstrip low-pass filter, transmission zero point determination method and transmission zero point frequency setting method

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Embodiment 1

[0038] Embodiment 1 of the present invention provides a microstrip low-pass filter, such as figure 1 As shown, it includes input and output ports 1, a pair of high-impedance open-circuit stubs 2, a pair of parallel coupled lines loaded with hexagonal resonators 3, folded high-impedance transmission lines 4, three-stage cascaded hexagonal coupled resonators 5, two Back-to-back hexagonal resonators 6, a pair of single-stage hexagonal resonators 7. The filter circuit is manufactured by Rogers4003 substrate, and the thickness of the substrate is 0.508mm. Wherein, the input and output port 1 is a straight microstrip transmission line, and the characteristic impedance of the transmission line is 50 ohms. The input and output port 1 is used to weld a 50-ohm connector to realize the assembly and integration of the circuit. The input and output ports 1 are directly connected to a pair of high-impedance open stubs 2 and a pair of parallel coupled lines 3 loaded with hexagonal resonato...

Embodiment 2

[0042]Embodiment 2 of the present invention provides a method for determining the number of transmission zeros. It should be noted that the present invention aims at realizing an ultra-wide stopband while ensuring sufficient stopband suppression. The more transmission zeros in the stop band of the filter, the higher the stop band suppression degree; the larger the frequency span of each transmission zero point setting, the larger the stop band range, and an ultra-wide stop band can be formed. Determining the number and frequency of zero points here can clarify the stop band action range of each resonator, and accurately optimize the stop band characteristics. The parallel coupled line 3 loaded with a hexagonal resonator is composed of a high-impedance parallel coupled line and a hexagonal resonator. Its LC equivalent circuit, odd-mode equivalent circuit, and even-mode equivalent circuit are respectively shown as figure 2 , image 3 , Figure 4 shown. The number of zeros ge...

Embodiment 3

[0063] Embodiment 3 of the present invention provides a method for setting the frequency of transmission zeros. The method for determining the number of transmission zeros in Embodiment 2 above is used to determine the number of transmission zeros of parallel coupled lines loaded with hexagonal resonators. The effective capacitance and inductance value can set the transmission zero frequency, which helps to accurately optimize the design of ultra-wide stopband.

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Abstract

The invention discloses a microstrip low-pass filter, a transmission zero point determination method, and a transmission zero point frequency setting method in the technical field of communication systems, and aims to solve the technical problem that a microstrip low-pass filter in the prior art is not beneficial to system miniaturization due to the fact that the circuit size of the microstrip low-pass filter is large. The microstrip low-pass filter comprises input and output ports, which include an input port and an output port, wherein the input port and the output portare directly connected with high-impedance open-circuit branches and parallel coupling lines loaded with hexagonal resonators, and the number of the folded high-impedance open-circuit branches and the number of the parallel coupling lines loaded with the hexagonal resonators are both two. According to the invention, the microstrip low-pass filter is compact in circuit structure, and the technical problem that in the prior art, a microstrip low-pass filter is large in circuit size, and system miniaturization is not facilitated is solved, the stopband width and the stopband suppression degree are improved, and specifically, the microstrip low-pass filter has an ultra-wide stopband covering 40 GHz, the relative stopband bandwidth reaches 182%, the stopband suppression degree is better than 25 dB, and the frequency band suppression degree of 70% of the stopband reaches 30 dB.

Description

technical field [0001] The invention relates to a microstrip low-pass filter and a transmission zero point determination and frequency setting method, belonging to the technical field of communication systems. Background technique [0002] With the development of high-resolution radar systems and high data transmission rate communication systems, the system has higher and higher requirements for suppressing harmonics, spurious signals, out-of-band noise and separating useful signals of different frequencies. Therefore, high-performance microstrip low-pass filters have become a key component of radar and communication systems, and the ultra-wide stopband characteristics covering the millimeter wave band are of great significance to the improvement of the overall performance of the application system. [0003] The microstrip low-pass filter structure has the advantages of simple manufacturing process, low cost, and convenient assembly. In order to obtain ultra-wide stopband c...

Claims

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Application Information

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IPC IPC(8): H01P1/203G06F30/20
CPCH01P1/20381G06F30/20
Inventor 闵立中蒋姝杨会军刘扬冯琤许恒飞刘婷婷
Owner NANJING INST OF TECH
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