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Micro differential filter based on T-shaped branch line structure

A branch line and filter technology, applied in the direction of waveguide devices, electrical components, circuits, etc., can solve the problems of few passbands, unfavorable circuit realization and result analysis, etc., and achieve good common mode suppression effect

Inactive Publication Date: 2018-03-23
SHANGHAI MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the impedance of the microstrip line is set to be smaller, its width will be larger, and it is easy to generate surface waves and excite high-order modes, which is not conducive to circuit realization and result analysis
[0003] The simplified theoretical analysis of the T-branch structure was obtained by Chang Kai et al. using the ABCD matrix. The original idea was to use the T-branch structure to suppress the high-order harmonics of the band-pass / band-stop filter, but it is rarely used to generate the passband

Method used

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  • Micro differential filter based on T-shaped branch line structure
  • Micro differential filter based on T-shaped branch line structure
  • Micro differential filter based on T-shaped branch line structure

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Embodiment Construction

[0029] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0030] The filter includes: 1. Two T-shaped internal resonators and two T-shaped external resonators; 2. Four input and output ports; 3. Two open-circuit stubs.

[0031] Since there is still room for research in the design of miniaturized differential filters based on the T-shaped branch line structure, figure 1 It is a schematic front view of a novel miniaturized differential filter based on a T-shaped branch line structure of the present invention; figure 2 It is a microstrip line structure diagram of a miniaturized differential filter based on a T-shaped branch line structure; image 3 and Figure 4 They are the differential mode electromagnetic simulation and test results and the common mode electromagnetic simulation and test results...

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Abstract

The invention discloses a novel patch topological structure, particularly relates to a micro differential filter based on the T-shaped branch line structure and belongs to the microwave communicationfield. The differential filter comprises four T-shaped resonators and the input and output of the feeder. The micro differential filter of the T-shaped branch line structure mainly employs a one-endshort circuit T branch and an open circuit T branch to design a filter microstrip line. According to the micro differential filter, the complementary symmetric network is utilized to analyze the differential filter, not only because the complementary symmetric network has characteristics of low loss and no mode power conversion, but also because any four-port networks can be seen as two-port differential mode signals and two-port common-mode signals. The micro differential filter is advantaged in that a tap-type feeding mode is employed, firstly, insertion loss can be reduced, impact of external factors on filter performance is reduced, and signal transmission capabilities are enhanced; and secondly, a feed line and a transmission line form a stepped impedance resonator, frequency responsecan be improved through adjusting the impedance ratio, and realization of miniaturization requirements is facilitated.

Description

technical field [0001] The invention relates to the field of microwave communication, in particular to a differential filter. Background technique [0002] In the development of microwave integrated circuits, the development and optimization of filters plays an indispensable role. Based on this, this also requires the filter to develop in the direction of miniaturization, high stop band ratio, and low loss. The indicators to measure the differential filter are mainly differential mode stop band and common mode rejection. A common method to increase the filter stop band is to use step impedance resonators, namely SIR (Stepped Impedance Resonators). However, if the impedance of the microstrip line is set to be smaller, its width will be larger, and it is easy to generate surface waves and excite high-order modes, which is not conducive to circuit realization and result analysis. [0003] The simplified theoretical analysis of the T-branch structure was obtained by Chang Kai ...

Claims

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Application Information

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IPC IPC(8): H01P1/20
CPCH01P1/20
Inventor 章庆张友俊张吉曜
Owner SHANGHAI MARITIME UNIVERSITY
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