Retractable antenna system with switchable impedance matching

Details Retractable antenna system with switchable impedance matching Retractable antenna system with switchable impedance matching

1998-05-06

1999-07-13

Wong, Don

Communications: radio wave antennas

Antennas

With radio cabinet

343901, 343876, H01Q 124

Patent

active

059232978

ABSTRACT:
Antenna systems for radiotelephones and other electronic devices include a first impedance matching circuit that electrically connects to a retractable antenna via a feed terminal when the retractable antenna is in an extended position and a second impedance matching circuit that electrically connects to the retractable antenna via the same feed terminal when the retractable antenna is in a retracted position. A switch opens and closes in response to detected positions of a retractable antenna to allow the first and second impedance matching circuits to electrically connect with an antenna via the same feed terminal.

REFERENCES:
patent: 5335368 (1994-08-01), Tamura
patent: 5374937 (1994-12-01), Tsunekawa et al.
patent: 5635943 (1997-06-01), Grunwell
patent: 5659888 (1997-08-01), Kato et al.
patent: 5815820 (1998-09-01), Kiem et al.

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