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Three-order annular broadband band-pass equal-ripple filter and design method thereof

A design method and filter technology, which are used in waveguide-type devices, CAD circuit design, special data processing applications, etc.

Inactive Publication Date: 2021-04-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the mainstream production of broadband microstrip filters with equiripple filtering characteristics is mainly completed by cascading passive devices to generate Chebyshev equiripple responses. When the required number of ripples is large, the lateral geometric size of the circuit will increase linearly. 7-segment transmission lines and 8-segment short wires (grounding wires) are connected in series XOR and 7-segment coupling lines are connected in series to obtain a filter with Chebyshev equal ripple filtering characteristics with 8 reflection zero points. Due to the need for a large number of microstrip lines, the circuit The production and application of

Method used

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  • Three-order annular broadband band-pass equal-ripple filter and design method thereof
  • Three-order annular broadband band-pass equal-ripple filter and design method thereof
  • Three-order annular broadband band-pass equal-ripple filter and design method thereof

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Embodiment

[0133] Such as Figure 5 As shown, this embodiment adopts an equiripple circuit model in which the transmission lines of the uplink signal path are cascaded coupled lines, and then the coupled lines of the downlink signal path are connected in parallel. The electrical length of the line is consistent with the characteristic parity impedance, and the point length and characteristic impedance of the transmission lines on both sides of the downlink signal path are consistent, including:

[0134] (1) First solve the ABCD matrix for the two ports of the uplink signal path and the two ports of the downlink signal path:

[0135] Among them, the ABCD matrix of the two ports of the uplink signal path can be written as:

[0136]

[0137] The ABCD matrix of the two ports of the downlink signal path can be written as:

[0138]

[0139] in:

[0140] A up =a u3 cos 3 θ+a u1 cosθ;

[0141]

[0142]

[0143] D. up = d u3 cos 3 θ+d u1 cosθ;

[0144] A down =a d3 cos ...

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Abstract

The invention discloses a three-order annular broadband band-pass equal-ripple filter which comprises an input end unit, an output end unit, an uplink signal path arranged between the input end unit and the output end unit, and a downlink signal path arranged between the input end unit and the output end unit and connected with the uplink signal path in parallel. Each of the uplink signal path and the downlink signal path is formed by cascading a third-order coupling line and a transmission line; each of the uplink signal path and the downlink signal path comprises a coupling line, and the electrical length and the characteristic impedance value of the first section of cascaded microstrip line are the same as those of the third section of cascaded microstrip line. The invention further provides a design method of the third-order annular broadband band-pass equal-ripple filter, and what can be guaranteed is that the filter passband has the flat group delay characteristic.

Description

technical field [0001] The invention relates to a third-order annular broadband bandpass equiripple filter and a design method thereof, and belongs to the technical field of radio frequency circuit microstrip line device manufacturing. Background technique [0002] With the rapid development of microwave technology, it has been widely used commercially, and plays an irreplaceable role in medical imaging, radar measurement and control, radio frequency identification, regional security, wireless communication, military industry, aerospace and other fields. Microwave technology has become an important part of contemporary society. an integral part. Due to the importance of microwave technology, the performance requirements of microwave devices are also increasing. Among them, as an integral part of the microwave RF front-end, the filter has always been a popular research direction in academia and industry. Its function is to suppress interference signals other than specific fr...

Claims

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Application Information

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IPC IPC(8): H01P1/20G06F30/33
CPCG06F30/33H01P1/20
Inventor 王小龙黄振葵卢革宇
Owner JILIN UNIV
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