High Selectivity Balanced Bandpass Full Frequency Common Mode Rejection Pass-Band Common Mode Absorption Filter

Abstract

An embodiment of the present invention provides a high-selectivity balanced band-pass full-frequency common-mode suppression pass-band common-mode absorption filter. The filter includes: a dielectric substrate and two input ports 1 and 1 arranged on the dielectric substrate. Two output ports 2, a first filter circuit structure unit 3, a second filter circuit structure unit 4, four branches and four resistors, the branches are transmission lines with impedance, and the four branches include two first branches Z1, two second branches Z2, the four resistors include two first resistors R1 and two second resistors R2. Applying the balanced filter provided by this embodiment can reduce the reflection of common mode noise on the basis of having good filtering characteristics.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a high-selectivity balanced band-pass full-frequency common-mode suppression pass-band common-mode absorption filter. Background technique [0002] With the development of communication technology, fully balanced RF front-ends in communication systems can better suppress common-mode interference. Specifically, the balanced filter in the above-mentioned fully balanced radio frequency front-end can exhibit a suppression effect on common-mode noise and effectively suppress common-mode interference, thereby improving the overall efficiency and anti-interference capability of the communication system. [0003] However, while conventional balanced filters reject common-mode noise, they reflect common-mode noise. Because the balanced filter is a part of the fully balanced RF front-end, the RF front-end will be full of common-mode noise, and there are many devices that are sensitive...

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Problems solved by technology

[0003] However, while conventional balanced filters reject common-mode noise, they reflect common-mode noise

Because the balanced filter is a part of the fully balanced RF front-end, the RF front-end will be full of common-mode noise, and there are many devices that are sensitive to common-mode noise in the above-mentioned fully-balanced RF front-end, and the performance of the above-mentioned devices is easily affected by the common-mode noise. The impact of noise, thus affecting the communication performance of the fully balanced RF front-end and the communication performance of the communication system

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