ON-VEHICLE ANTENNA MATCHING DEVICE

PURPOSE: To provide an on-vehicle antenna with a high gain with respect to all the received frequencies by providing a diversity changeover section selecting a diversity antenna and a matching circuit connected to the diversity changeover section. CONSTITUTION: A diversity changeover section 7 is incorporated in an on-vehicle antenna matching device 100 and a matching circuit 3 is provided at a stage after a high frequency signal is selected. In this case, the diversity changeover section 7 selects alternatively select either of diversity antennas 1, 2 based on a diversity changeover control signal of a tuner 8. Furthermore, the matching circuit 3 matches an antenna output of either of the diversity antennas 1, 2 receiving the selection signal with an input to the tuner 8. Thus, number of matching circuits is decreased and the high gain on-vehicle antenna is realized.