Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Reexamination Certificate
2007-02-13
2007-02-13
Vo, Tuyet (Department: 2821)
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
C343S860000
Reexamination Certificate
active
11006559
ABSTRACT:
An electrical signal is fed from one terminal of an antenna element, and the other terminal thereof is terminated by a variable reactance circuit. A reactance value of the variable reactance circuit is changed according to use state of a device to optimally set its directivity. Matching conditions at an electricity feeding point are controlled to match an impedance of the electricity feeding point which fluctuates according to the value of the variable reactance circuit. With the above construction, there are provided an antenna device that is downsized, can control its directivity, and does not deteriorate a communication quality depending on a use state, and a radio communication apparatus provided with the antenna device.
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European Search Report dated Feb. 17, 2005.
NEC Corporation
Vo Tuyet
Vu Jimmy
Whitham Curtis Christofferson & Cook PC
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