Communications: radio wave antennas – Antennas – High frequency type loops
Patent
1999-03-24
1999-11-30
Le, Hoanganh
Communications: radio wave antennas
Antennas
High frequency type loops
343743, 343870, 343866, H01Q 1112, H01Q 124
Patent
active
059950544
ABSTRACT:
A communications device comprises a loop antenna having a plurality of feed terminals defining at least two terminal pairs. A controller is provided for selecting one terminal pair to enable reception or transmission from the loop antenna using the selected terminal pair. The selection of terminal pair is made based on the measurement of at least one parameter which is responsive to the proximity to the antenna of, for example, a user of the device. One terminal pair provides an antenna having matched impedance when the user is near the device, and the other terminal pair provides an antenna having matched impedance when the user is distant.
REFERENCES:
patent: 4920353 (1990-04-01), Mori et al.
patent: 5710987 (1998-01-01), Paulick
Le Hoang-anh
Slobod Jack D.
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