Antenna apparatus

Details Antenna apparatus Antenna apparatus

1997-09-15

1999-11-09

Le, Hoanganh

Communications: radio wave antennas

Antennas

With radio cabinet

343895, H01Q 124

Patent

active

059823305

ABSTRACT:
In an antenna apparatus, a monopole antenna element connected to an antenna matching circuit via a first contact 105 when a whip antenna is extended; a helical antenna element connected to the antenna matching circuit via a second contact when the whip antenna is accommodated; and a parasitic helical element disposed in close proximity to the helical antenna element at a spacing which is sufficiently small with respect to the wavelength of a first frequency band of a radio circuit.

REFERENCES:
patent: 5504494 (1996-04-01), Chatzipetros et al.
patent: 5594459 (1997-01-01), Hirota
patent: 5650789 (1997-07-01), Elliott et al.

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