Switched retractable, extendable, dual antennas for portable rad

Details Switched retractable, extendable, dual antennas for portable rad Switched retractable, extendable, dual antennas for portable rad

1997-01-27

1998-12-22

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With radio cabinet

343729, 343901, H01Q 124

Patent

active

058524223

ABSTRACT:
High gain antenna equipment is provided by improving gain with optimal impedance matching with an antenna element in a stored state as well as in an extended state. The antenna equipment is provided with a radio communication device housed in a case, a pullout type antenna element, a coil acting as a matching circuit element in an extended state of the antenna element and as a helical antenna in a stored state, and a switch connected to the coil at one end which is brought into contact at the other end with a ground terminal when the antenna element is in an extended state and which is brought into contact with an open terminal when the antenna element is in a stored state.

REFERENCES:
patent: 4313119 (1982-01-01), Garay et al.
patent: 4860024 (1989-08-01), Egashira
patent: 5353036 (1994-10-01), Baldry
patent: 5374937 (1994-12-01), Tsunekawa et al.
patent: 5412392 (1995-05-01), Tsunekawa
patent: 5446469 (1995-08-01), Makino
Patent Abstracts of Japan, vol. 13, No. 429, E823, 1160101, Jun. 1989.

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