Leakage radiation preventing element

Details Leakage radiation preventing element Leakage radiation preventing element

1996-10-07

1998-07-21

Kincaid, Kristine L.

Electricity: conductors and insulators

Anti-inductive structures

Conductor transposition

333 12, 174152R, H05K 900

Patent

active

057837724

ABSTRACT:
A novel leakage radiation preventing element effectively prevents radio waves from being radiated from an electronic appliance, without depending upon a capacitor or a choke coil. The leaked current I.sub.os and I.sub.or generated from a hole or a gap formed in a casing or a chassis is introduced into a wave guide path and then attenuated by radio wave absorption function of a magnetic substance disposed therein. A coaxial conductor (2) is passed through a hole (107) formed in a chassis (3). The wave guide path (104) is formed between the chassis and a conductive disk (101) electrically floated from the chassis. A radially outward end of the wave guide path (i.e., the outer circumferential end of the conductive disk) is shorted to the chassis at high frequency, and further the inside of the wave guide path is filled with a ferrite ring (102). Therefore, when being propagated along the wave guide path, the high frequency current leaked from the hole or gap of the chassis is absorbed by the ferrite ring, without being radiated to the outside.

REFERENCES:
patent: 4845447 (1989-07-01), Holdsworth
patent: 4952896 (1990-08-01), Dawson, Jr.
patent: 5091707 (1992-02-01), Wollmerschauser et al.
patent: 5329066 (1994-07-01), Hansson
patent: 5333095 (1994-07-01), Stevenson et al.
patent: 5557074 (1996-09-01), Miyamoto et al.

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