Patent ID: 6104356
Filing Date: 2000-08-15
Classification: H01Q,H04B

Abstract:
A diversity antenna circuit comprising:a first antenna for mainly receiving a vertically polarized electric wave;a second antenna for mainly receiving a horizontally polarized electric wave;a receiver for detecting an electric field strength of a signal received by said first antenna and said second antenna;a first matching circuit configured to match impedance of said first antenna to that of said receiver;a second matching circuit configured to match impedance of said second antenna to that of said receiver;a first transferring element having one end thereof connected to the end of said first matching circuit not connected to said first antenna and another end connected to said receiver;a second transferring element having one end thereof connected to the end of said second matching circuit not connected to said second antenna and another end thereof connected to said receiver;a first switch coupled between a connection point of said first matching circuit with said first transferring element and a ground voltage terminal;a second switch coupled between a connection point of said second matching circuit with said second transferring element and the ground voltage terminal; anda switch control circuit to control said first and second switches to connect said receiver to one of said first antenna and said second antenna and separating said receiver from another of said first antenna and said second antenna based on the electric field strength detected by said receiver.