Helical antenna for a portable radio apparatus

Details Helical antenna for a portable radio apparatus Helical antenna for a portable radio apparatus

1997-08-29

2000-01-04

Trost, William G.

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

343895, H04Q 720

Patent

active

060119640

ABSTRACT:
A helical antenna is provided for portable radio apparatus characterized in having one communication band switch and having two separated communication bands, or a broad communication band. The helical antenna comprises a screw shaped emitting element having one power supply terminal and two communication band switching terminals, a switch which short circuits and disconnects the two communication band switching terminals, and a switch drive circuit which drives this switch, and in accordance with an externally applied signal, the switch drive circuit short circuits or disconnects the switch, and by means of the disconnection or short circuiting of the two communication band switching terminals, the resonance frequency is switched.

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