| 摘要 |
PROBLEM TO BE SOLVED: To provide an on-vehicle antenna system for diversity reception using a magnetic field antenna and an electric field antenna that amplifies not only radio signals but also TV signals with frequencies over a wide band in the case of amplifying the signal received by the magnetic field antenna. SOLUTION: The antenna system is provided with an electric field antenna 1, a magnetic field antenna 2, an operation section 3 that enters a channel selection command, a tuning circuit 4 that tunes a signal with a frequency corresponding to a channel selection command received from the magnetic field antenna 2, and a reception section 5 that selects a channel according to the channel selection command, compares a signal received by the electric field antenna 1 with a signal received by the magnetic field antenna 2 and outputted via the tuning circuit 4 tuning the signal with the frequency in response to the channel selection command and selects a signal which has a better reception state. The tuning circuit 4 is provided with a varactor diode that tunes signals over a wide frequency band. By application of a control voltage to the varactor diode using the reception section 4, the tuning frequency of the magnetic field antenna 2 can be freely changed.
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