Communications: radio wave antennas – Antennas – Switching between antennas and lines
Reexamination Certificate
2006-05-23
2006-05-23
Nguyen, Hoang V. (Department: 2821)
Communications: radio wave antennas
Antennas
Switching between antennas and lines
C343S745000
Reexamination Certificate
active
07050018
ABSTRACT:
A radio antenna having radiating conductors (28,30,32) which can be connected together by the action of antenna switch modules (20,22,24), whereby the electrical length of said antenna can be changed. Power and control signals to said antenna switch modules, are conducted from the antenna controller (18) through the feed line (14), and said radiating conductors. The radiating direction of said antenna can be changed by a directional switch module (74), which receives power and control signals through said feed line from a directional control circuit (29). Thus said antenna can be tuned for a plurality of frequency bands, and the radiating direction can be changed, by remote control.
REFERENCES:
patent: 4201990 (1980-05-01), Altmayer
patent: 4564843 (1986-01-01), Cooper
patent: 4924238 (1990-05-01), Ploussios
patent: 6195065 (2001-02-01), Hung et al.
patent: 2004/0214605 (2004-10-01), Zhang et al.
The Arrl Antenna Book Trap Antennas, pp. 7-8 to 7-11 Published by The American Radio Relay League Newington Ct.
The Arrl Antenna Book Coupling the Transmitter to the Line, pp. 25-1 to 25-14 Published by The American Radio Relay League Newington Ct.
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