Electrically adjusting common mode rejection filter based on selective frequency coupling

A frequency-selective, common-mode rejection technology, applied in waveguide-type devices, circuits, electrical components, etc., can solve problems such as ESC filters that have not been publicly proposed, and achieve easy design of passband performance, increased flexibility, and high commonality. The effect of the mode signal suppression effect

Active Publication Date: 2015-06-10
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, these two methods suppress the common-mode signal by controlling the resonator. So far, there is no publi

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  • Electrically adjusting common mode rejection filter based on selective frequency coupling
  • Electrically adjusting common mode rejection filter based on selective frequency coupling
  • Electrically adjusting common mode rejection filter based on selective frequency coupling

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0018] like figure 1 Shown is the structure of the frequency-selective coupling-based electrically adjustable common-mode rejection filter, including the upper microstrip structure, loading capacitance, loading varactor diode, intermediate dielectric substrate and bottom metal floor, and the upper microstrip structure is attached to The upper surface of the intermediate dielectric substrate, and the lower surface of the intermediate dielectric substrate is the underlying metal floor;

[0019] The upper layer microstrip structure is composed of four half-wavelength resonators, four feed lines and four ports; the two ends of each feed line form symmetrical coupling with the two ends of each half-wave resonator; the four ports are located in the midd...

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Abstract

The invention discloses an electrically adjusting common mode rejection filter based on selective frequency coupling. The electrically adjusting common mode rejection filter based on selective frequency coupling comprises an upper-layer microstrip structure, loading capacitors, loading variable capacitance diodes, a dielectric substrate and a bottom-layer metal ground plate, wherein the upper-layer microstrip structure is attached to the upper surface of the dielectric substrate, and the lower surface of the dielectric substrate is provided with the bottom-layer metal ground plate; the upper microstrip structure is composed of four half-wavelength resonators, four feeder lines and four ports; both ends of every feeder line form symmetric coupling with both ends of the corresponding half-wavelength resonator; every port is formed in the middle of every feeder line; the loading variable capacitance diodes are arranged at the open ends of the half-wavelength resonators for adjusting the central frequency; the loading capacitors are arranged at the tail ends of the feeder lines and the connecting positions among the feeder lines for controlling external quality factors.

Description

technical field [0001] The invention relates to an electric-tunable common-mode suppression filter, in particular to an electric-tunable common-mode suppression filter based on frequency selective coupling that can be applied to a radio frequency front-end circuit. Background technique [0002] In existing wireless communication systems, common mode rejection filters are in great demand because they have good anti-interference ability against environmental noise. In recent years, scholars at home and abroad have launched a lot of research to design such filters. Some people use an S-shaped resonant ring on the floor of the microstrip structure to suppress common-mode signals. Such a filter circuit can suppress common-mode signals without adding an external circuit structure, but it will generate relatively large losses, and at the same time The suppression effect of common-mode signals is not very good; in addition, a more common way is to design some special circuit struct...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 潘伟锵郭庆毅徐金旭
Owner SOUTH CHINA UNIV OF TECH
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