Antenna for a portable radiotelephone

Details Antenna for a portable radiotelephone Antenna for a portable radiotelephone

1988-07-08

1989-08-29

Hille, Rolf

Communications: radio wave antennas

Antennas

With radio cabinet

343900, 343903, H01Q 124

Patent

active

048621820

ABSTRACT:
An antenna system for a portable radiotelephone which does not require an expensive mechanical and bulky change-over switch to switch between the transmitting and receiving main antenna element and the call signal-receiving sub-antenna element. This is accomplished by a rod-shaped transmitting and receiving main antenna element within an antenna retaining mechanism so designed that the antenna element is free to slide in and out of the case of the radiotelephone. This case also houses a sub-antenna element which is in constant electrical contact with the antenna retaining mechanism. Conductive components in the elements provide the switching function, and one of them, a conductive tube, is constantly connected to the transmitter-receiver set in the case so that there is no deterioration of the characteristics of the main antenna element.

REFERENCES:
patent: 3087117 (1963-04-01), Mitchell
patent: 3946390 (1976-03-01), Alexander et al.
patent: 4121218 (1978-10-01), Irwin et al.
patent: 4598295 (1986-07-01), Murphy

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