Antenna device and transmitter-receiver using the antenna...

Details Antenna device and transmitter-receiver using the antenna... Antenna device and transmitter-receiver using the antenna...

2006-04-25

2006-04-25

Nguyen, Hoang V. (Department: 2821)

Communications: radio wave antennas

Antennas

With variable reactance for tuning antenna

C343S744000

Reexamination Certificate

active

07034760

ABSTRACT:
An antenna device of transmission line type having two antenna elements opposed to each other, and a signal is fed between the two antenna elements. A variable-capacitance unit capable of changing the electrostatic capacity is provided at one or both of connection points at which opposite ends of the two antenna elements are connected to each other. Each variable-capacitance unit has a variable-capacitance diode, the electrostatic capacity of which changes according to a direct-current voltage applied between the anode and the cathode.

REFERENCES:
patent: 6104354 (2000-08-01), Hill et al.
patent: 6369603 (2002-04-01), Johnston et al.
patent: 6844854 (2005-01-01), Johnson et al.
patent: 9-284028 (1997-10-01), None

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