Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1994-01-14
1995-11-14
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With radio cabinet
343862, 343901, H01Q 110, H01Q 124
Patent
active
054670977
ABSTRACT:
The present invention relates to the constitution of an antenna for portable wireless apparatus, and has an object to provide an antenna unit capable of operating satisfactorily when the antenna element is extended out of the case and stowed in the case as well. A portion of the antenna element not stowed in an antenna stowage pipe when the antenna is pushed into the plastic case, functions as a radiation element. A portion of the antenna element and an antenna stowage pipe produced of a metal for stowing this portion constitute an impedance stub circuit. Antenna impedances of the antenna element in the extended and stowage positions as well can be made approximately the same by properly setting the length of the antenna element which is stowed in the antenna stowage pipe and the length of the portion not stowed in the stowage pipe.
REFERENCES:
patent: 4603333 (1986-07-01), Carlson
patent: 4860024 (1989-08-01), Egashira
patent: 4862182 (1989-08-01), Egashira
patent: 4890114 (1989-12-01), Egashira
patent: 4945361 (1990-07-01), Egashira
patent: 4958382 (1990-09-01), Imanishi
patent: 5072230 (1991-12-01), Taniyoshi et al.
Mitsubishi Denki & Kabushiki Kaisha
Wimer Michael C.
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