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Common mode filter

A common-mode filter and a common technology, applied in the direction of waveguide devices, waveguides, impedance networks, etc., can solve the problems of high impedance and difficult passage of two wires, achieve easy planar structure, simplify structure, and obtain planarity structure effect

Active Publication Date: 2012-07-11
ELMEC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008]On the other hand, the common mode signal flows in the same phase in the two wires, and the magnetic flux generated in the magnet is sufficiently consistent, so that the impedance of the two wires becomes high and difficult to pass

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Embodiment Construction

[0095] Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0096] figure 1 is a schematic cross-sectional view showing the basic structure of the common mode filter F of the present invention, figure 2 It is an exploded perspective view showing its form in a perspective view. figure 2 The external circuit is also shown in .

[0097] exist figure 1 and figure 2 Among them, a pair of strip-shaped conductor lines 1A, 1B are formed on a single surface (upper surface in the figure) of a square, for example rectangular, thin plate-shaped dielectric layer 3 at equal intervals and in parallel.

[0098] On the other surface of the dielectric layer 3 (the lower surface in the figure), a conductive raised ground electrode 5 is formed on the entire surface in such a way as to face the conductive lines 1A and 1B, thereby forming a microstrip distribution constant type of differential transmission line. The function...

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Abstract

In an ultrahigh-speed differential transmission line, an ultrahigh-speed differential signal is passed to sufficiently attenuate a common mode signal. A pair of conductor paths (1A, 1B) are formed on one side surface of a dielectric layer (3) in parallel. A floating ground (5) is formed on the other side surface of the dielectric layer (3) so as to face the conductor paths (1A, 1B). The floating ground (5) is not connected to a common ground (7) outside and is independent therefrom. A passive two-terminal circuit (CM1) consisting of a passive circuit element is connected between a connection point (9) of the floating ground (5) and the common ground (7).

Description

technical field [0001] The invention relates to a common-mode filter, in particular to a novel common-mode filter, which can ensure the transmission of ultra-high-speed differential signals in ultra-high-speed differential transmission lines and attenuate common-mode signals. Background technique [0002] In recent years, high-definition video content such as "HDTV (high definition television): High-definition television" and "Blu-ray Disc (Blu-ray Disc)" has become popular. In order to support these image contents, a large amount of digital data needs to be transmitted at high speed, that is to say, high-speed serial transmission needs to be used. [0003] In high-speed serial transmission, in order to shorten the pulse rise time, it is necessary to reduce the voltage amplitude, resulting in poor noise immunity. Therefore, in order to improve the anti-noise performance, the way of differential transmission is commonly used. [0004] The above-mentioned differential transm...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/01
CPCH01P3/026H01P1/20
Inventor 龟谷雅明
Owner ELMEC