Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1996-12-26
1998-09-01
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With radio cabinet
343725, 343860, 343900, H01Q 124
Patent
active
058016627
ABSTRACT:
A portable radio device antenna apparatus has a retractable antenna element mounted on the casing of a radio device. The antenna element includes a straight element having an electrical length of .lambda./2 and a helical coil having an electrical length of .lambda./4 and attached to the upper end of the straight element. The casing contains an impedance matching circuit having a pair of terminals and serving to perform impedance matching of the straight element. When the straight element is pulled out from the casing, a feeding metal piece connected to a radio circuit and a lower connection metal piece connected to one terminal of the impedance matching circuit are simultaneously connected to the short-circuit metal fixture of the antenna element, and an upper connection metal piece connected to the other terminal of the impedance matching circuit is brought into contact with the straight element. When the straight element is retracted, the feeding metal piece is brought into contact with a first contact metal fixture connected to the helical coil, and the lower and upper connection metal pieces are respectively brought into contact with an insulator between the straight element and the helical coil and a protective cover which covers the helical coil.
REFERENCES:
patent: 5204687 (1993-04-01), Elliott et al.
patent: 5446469 (1995-08-01), Makino
NEC Corporation
Wimer Michael C.
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