| 摘要 |
An automobile antenna apparatus includes an antenna element, such as planar antenna (10) having a plurality of conductive wires buried in the rear windshield (12) of an automobile, a high-frequency signal-processing unit (20), and a receiver (30). The signal-processing unit (20) is arranged in the rear pillar in order to minimize the distance between antenna element (10) and signal-processing unit (20). The signal-processing unit (20) includes a tuning amplifier, an intermediate-frequency amplifier, and a demodulator. The receiver (30) includes a low-frequency amplifier, and a station selector for outputting a DC voltage signal, as a tracking signal, according to the frequency of a selected station. The tuning amplifier amplifies a high-frequency signal within the tuned frequency band, in accordance with the voltage of the tracking signal. |
