Antenna for a portable radiotelephone

Details Antenna for a portable radiotelephone Antenna for a portable radiotelephone

1988-09-08

1989-08-22

Hille, Rolf

Communications: radio wave antennas

Antennas

With radio cabinet

343900, 343903, H01Q 124

Patent

active

048600245

ABSTRACT:
An improved transmitting and receiving antenna for a portable radiotelephone with an antenna element which can be accommodated inside of the case of the portable radiotelephone, compensating for the drop in reception sensitivity that occurs when the antenna element is located inside of the case. The rod-shaped antenna element freely insertable into and removable from the case, and electrically connected to an antenna retaining mechanism both when the antenna element is retracted and extended. Thus, the antenna element functions even when it is located inside of the case. Moreover, an auxiliary antenna element is connected to the antenna element when the latter is located inside the case. The inductive reactance component of the auxiliary antenna element compensates for deterioration of the Standing Wave Ratio caused by the increased stray capacity resulting from the antenna element being located of inside the case. As a result, an adequate reception sensitivity can be maintained, and when the portable radiotelephone is not in use, the antenna element is withdrawn into the case so as not to create a nuisance; while incoming calls can still be responded to.

REFERENCES:
patent: Re22365 (1943-08-01), Gebhard et al.
patent: 3087117 (1963-04-01), Mitchell
patent: 4121218 (1978-10-01), Irwin et al.
patent: 4543581 (1985-09-01), Nemet

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