Automobile active receiving antenna

  • US 3,939,423 A
  • Filed: 07/01/1974
  • Issued: 02/17/1976
  • Est. Priority Date: 07/01/1974
  • Status: Expired due to Term
First Claim
Patent Images

1. An active receiving broadcast band antenna for an automobile radio receiver of amplitude and frequency modulated signals having a common feeder, comprising:

  • an antenna body mounted within the automobile interior;

    a bandpass filter having an input circuit including a capacitor, said capacitor comprising a metal member insulated from the automobile body and arranged in close vicinity to the automobile windshield and a structural member of said automobile body, said bandpass filter being included within said antenna body;

    a frequency-modulated signal amplifier positioned within said antenna body having an input connected to said bandpass filter and having an output;

    a power supply circuit for said frequency-modulated signal amplifier;

    a frequency correcting network positioned within said antenna body;

    an amplitude-modulated signal amplifier positioned within said antenna body and having an input connected to said bandpass filter via said frequency correcting network and an output;

    a power supply circuit for said amplitude-modulated signal amplifier;

    an interference filter connected to said power supply circuits of said frequency-modulated and amplitude-modulated signal amplifiers; and

    a frequency separation filter, said outputs of said frequency-modulated and amplitude-modulated signal amplifiers being connected to said common feeder of said radio receiver via said frequency separation filter.

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