Antenna assembly and portable radio apparatus

Details Antenna assembly and portable radio apparatus Antenna assembly and portable radio apparatus

1997-02-28

1999-09-14

Le, Hoanganh

Communications: radio wave antennas

Antennas

With radio cabinet

343895, H01Q 124

Patent

active

059529741

ABSTRACT:
A mono-pole antenna is composed of a first element and a second element. An insulator spacer is disposed between the first element and the second element so as to capacitively couple them. In the state that the antenna is retracted, the helical antenna operates. In the state that the antenna is extended, the mono-pole antenna composed of the first element and the second element operates. Since the mono-pole antenna is composed of the first element and the second element that are capacitively coupled, even if the electrical length of the helical antenna is different from the electrical length of the mono-pole antenna, the impedances can be properly matched with a common matching circuit.

REFERENCES:
patent: 5661495 (1997-08-01), Saldell
patent: 5731791 (1998-03-01), Jang
patent: 5825330 (1998-10-01), Na et al.

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