Noise rejection antenna system for nonmetallic marine vessels

Details Noise rejection antenna system for nonmetallic marine vessels Noise rejection antenna system for nonmetallic marine vessels

1987-07-16

1989-05-02

Sikes, William L.

Communications: radio wave antennas

Antennas

Plural separate diverse type

343702, H01Q 124

Patent

active

048272752

ABSTRACT:
A noise attenuating antenna system for AM-FM recreational receivers having a single RF input for use on nonmetallic marine vessels or any other vehicle where electric noise presents a problem. The antenna system has at least a shielded loop antenna for receiving radio signals in the AM frequency band and a dipole antenna for receiving radio signals in the FM frequency band. An impedance matching and signal routing circuit passes the signals received by the shielded loop antenna and the dipole antenna to the recreational receiver. An amplifier, whose operation is controlled by a remotely located selection switch, passes the RF signals received by the loop antenna to the impedance matching and signal routing circuit and a signal attenuating circuit passes to ground the RF signals recevied by the dipole antenna when the selection switch is in an AM position. The amplifier is de-energized blocking the signals from the shielded loop antenna and the signal attenuating circuit generates a high impedance to ground for the RF signals received by the dipole antenna when the selector switch is in the FM position. The antenna system may also have a dipole antenna tuned for the frequency of a weather station to accommodate recreational receivers having a weather band channel.

REFERENCES:
patent: 3824599 (1974-07-01), Haswell
patent: 3987448 (1976-10-01), Scheppman
patent: 4228544 (1980-10-01), Guyton
patent: 4268915 (1981-05-01), Parmet
patent: 4313119 (1982-01-01), Garay et al.
patent: 4395714 (1983-07-01), Takeda et al.

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