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Differential filter micro-strip line structure capable of suppressing common-mode signals

A technology for suppressing common mode and filter, applied in the field of differential filter microstrip line structure, can solve problems such as radio frequency interference, unbalance, electromagnetic interference, etc., to achieve the effect of suppressing common mode signal

Active Publication Date: 2019-09-10
FLEXIUM INTERCONNECT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, based on factors such as circuit layout considerations, design rule restrictions, or manufacturing errors, it leads to an unavoidable unbalanced structure, which causes common-mode noise. The common-mode signal is a kind of noise that can cause electromagnetic interference or radio frequency interference. and other issues, so there is a need to suppress common-mode signals

Method used

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  • Differential filter micro-strip line structure capable of suppressing common-mode signals
  • Differential filter micro-strip line structure capable of suppressing common-mode signals
  • Differential filter micro-strip line structure capable of suppressing common-mode signals

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Embodiment Construction

[0024] The following describes the present invention in detail with reference to the drawings and specific embodiments, but it is not intended to limit the present invention.

[0025] reference figure 1 The embodiment of the microstrip line structure of the differential filter of the present invention can be formed on the surface of a substrate (not shown), and the microstrip line structure is formed by a plurality of conductive metal layers (such as copper layers) Structure to implement differential filtering and suppression of common mode signals. The embodiment of the present invention includes a first phase shifter 10, a second phase shifter 20 and a common mode signal suppression element 30.

[0026] The first phase shifter 10 includes two feeding units 11 arranged in parallel along a first axis, and the second phase shifter 20 is arranged separately from the first phase shifter 10 and includes along the first axis. Two output units 21 arranged side by side, wherein the two o...

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Abstract

The invention discloses a differential filter micro-strip line structure capable of suppressing common-mode signals, which comprises a first phase shifter, a second phase shifter and a common-mode signal suppressing element. The first phase shifter comprises two feed-in units. The second phase shifter is arranged opposite to the first phase shifter and comprises two output units. The common-mode signal suppressing element comprises four line segments and a middle section. The middle section is located in the center of the distribution area of the two feed-in units and the two output units. A first line segment is connected between one feed-in unit and the middle section, a second line segment is connected between the other feed-in unit and the middle section, a third line segment is connected between one output unit and the middle section, and a fourth line segment is connected between the other output unit and the middle section. Common-mode signals are suppressed by the common-mode signal suppression element.

Description

Technical field [0001] The invention relates to a microstrip line structure of a filter, in particular to a differential filter microstrip line structure that can suppress common mode signals. Background technique [0002] Because differential transmission has high anti-interference characteristics against environmental noise, such as low electromagnetic interference (EMI) and low crosstalk, the differential transmission technology has become a component of high-speed digital signal systems. [0003] In the case of an ideal balanced structure, the digital signal system should only have differential mode signals. However, due to circuit layout considerations, design rule restrictions, or manufacturing errors, etc., the inevitable unbalanced structure results in common-mode noise, which is a kind of noise and can cause electromagnetic interference or radio frequency interference. So there is a need to suppress common mode signals. Summary of the invention [0004] In view of this, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
CPCH01P1/20381
Inventor 李威霆陈居毓郑志渊
Owner FLEXIUM INTERCONNECT INC