Antenna apparatus and a portable wireless communication...

Details Antenna apparatus and a portable wireless communication... Antenna apparatus and a portable wireless communication...

2005-05-17

2005-05-17

Le, Hoanganh (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S895000, C343S853000

Reexamination Certificate

active

06894648

ABSTRACT:
An antenna apparatus featuring a simple configuration and operability at a plurality of frequencies which are relatively proximate is provided. Phase shift circuits are connected respectively between feed points of a pair of antenna elements having different resonant frequencies and a radio circuit so as to shift phase of the radio waves and to increase an impedance of one of the antenna elements when the one of the antenna elements is used at the resonant frequency of the other one of the antenna elements.

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patent: 0 823 751 (1998-02-01), None
patent: 2 304 496 (1997-03-01), None
Patent Abstracts of Japan vol. 1997, No. 06, (Jun. 30, 1997) & JP 09 046259 A (Matsushita Electric Ind Co Ltd), (Feb. 14, 1997).

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