Communications: radio wave antennas – Antennas – With lumped reactance for loading antenna
Patent
1995-08-24
1997-01-14
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With lumped reactance for loading antenna
343901, 343702, H01Q 900
Patent
active
055944590
ABSTRACT:
An antenna used for a portable telephone includes a cylindrical outer conductor, an inner conductor, first and second coils and a contact. The inner conductor is disposed inside the outer conductor and is movable between a position wherein it has been pulled out from one end of the outer conductor and a position wherein it has been received into the outer conductor. The first coil is connected between a feed point and a feed side end portion of the outer conductor. The second coil is mounted on an end portion of the inner conductor projecting from the outer conductor. The contact is mounted on the feed point. In the antenna, when the inner conductor has been received into the outer conductor, the inner conductor makes contact with the contact and the first coil is thereby shorted and the electrical length is supplemented by the second coil.
REFERENCES:
patent: 3259901 (1966-07-01), Bykerk
patent: 4462033 (1984-07-01), Grashow
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 4958382 (1990-09-01), Imanishi
patent: 5504494 (1996-04-01), Chatzipetros et al.
Maioli Jay H.
Phan Tho
Sony Corporation
Wimer Michael C.
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