Antenna with fixed and movable elements

Details Antenna with fixed and movable elements Antenna with fixed and movable elements

1995-11-14

1998-10-06

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

With radio cabinet

343895, H01Q 124

Patent

active

058183922

ABSTRACT:
In a mobile radio transceiver, an antenna has a fixed element and a movable element. When the movable element is in an extended state, the movable element functions. On the other hand, when the movable element is in a retracted state, the fixed element functions. An impedance matching circuit preferentially performs impedance matching relative to the fixed element. A reactance element is further provided which is connected to the movable element when the movable element is in the extended state. On the other hand, the reactance element is out of connection to the movable element when the movable element is in the retracted state. With this arrangement, the impedance matching circuit and the reactance element cooperatively achieve impedance matching relative to the movable element when the movable element functions. Alternatively, if the impedance matching circuit preferentially performs impedance matching relative to the movable element, the reactance element is connected to the fixed element when the fixed element functions.

REFERENCES:
patent: 4862182 (1989-08-01), Egashira
patent: 5317325 (1994-05-01), Bottomley
patent: 5446469 (1995-08-01), Makino
patent: 5479178 (1995-12-01), Ha

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