Patent ID: 6362793
Filing Date: 2002-03-26
Classification: H01Q,H04B

Abstract:
An antenna device of a diversity reception system, comprising:a first antenna element installed so as to be retracted and pulled out freely; a fixed second antenna element; an unbalanced transmission line for supplying said first and second antenna elements with power; balancing-unbalancing transformation means for implementing balancing-unbalancing transformation action between said unbalanced transmission line and said first and second antenna elements; and switching means for selectively switching connections of said unbalanced transmission line with said first and second antenna elements and with only said first antenna element so that, at the time of reception, said first and second antenna elements are brought into connection with said unbalanced transmission line via said balancing-unbalancing transformation means, or only said second antenna element is brought into connection with said unbalanced transmission line, wherein said switching means are arranged to bring said unbalanced transmission line into connection with said the first and second antenna elements via said balancing-unbalancing transformation means so that said unbalanced transmission line supplies said first and second antenna elements with power via said balancing-unbalancing transformation means so as to operate said first and second antenna elements as an antenna.