Wireless portable device

Details Wireless portable device Wireless portable device

2007-01-16

2007-01-16

Vo, Nguyen T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S312000

Reexamination Certificate

active

10474756

ABSTRACT:
A current restriction structure for restricting a higher-harmonic-wave current generated in a digital circuit block from entering a radio circuit block and/or a radio-frequency current generated in the radio circuit block from entering the digital circuit block is disposed between the radio circuit block and the digital circuit block. The current restriction structure is formed by one or two of equivalent rectangular cylindrical metallic tube including metallic planes overlying/underlying the ground layer and a narrow-pitch via-hole array, which are disposed to enclose the subject current to be restricted and have a short-circuited distal end. The distance between the open plane of the equivalent rectangular cylindrical metallic tube and the short-circuiting plate is set at ¼ of the wavelength of the subject current to be restricted.

REFERENCES:
patent: 5453713 (1995-09-01), Partovi et al.
patent: 6121827 (2000-09-01), Khoini-Poorfard et al.
patent: 6166457 (2000-12-01), Iguchi et al.
patent: 6194913 (2001-02-01), Verkinderen et al.
patent: 6335866 (2002-01-01), Ohtaki et al.
patent: 6469259 (2002-10-01), Takeshita et al.
patent: 8-321720 (1996-12-01), None
patent: 9-18205 (1997-01-01), None
patent: 11-274818 (1999-10-01), None

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