Either of these types of sense antennas are connected by a transmission line to the front end of the ADF receiver.
Occasionally, a whip antenna may be used. In an aircraft, the sense antenna is customarily a long wire strung between the vertical stabilizer and a point on the top of the fuselage or strung between vertical posts mounted on the underside of the fuselage. The antenna is electrically rotated rather than physically rotated towards a station by a remotely located goniometer, the stator windings of which are connected to the loop coils. In this antenna the loop comprises two coils wound at right angles to one another about a rectangular slab of ferrite material. One form of loop antenna in wide use is described in U.S. Signal from the sense antenna eliminates the ambiguity in the bearing which would exist from use of the loop antenna alone. As is well known, such receivers provide bearings to radio transmitters by combining the signal from a directive loop antenna with the signal from an omnidirectional sense antenna. The present invention relates to a combination antenna for automatic direction finder radio receivers and for communications transceivers wherein the sense antenna also serves as an antenna for a communications receiver.Īutomatic direction finder (ADF) radio receivers are widely used as navigation instruments on aircraft. A combination antenna as claimed in claim 3 wherein said means connecting said capacitor to said direction finding receiver includes a low pass filter capable of passing without significant attenuation signals in the low frequency and broadcast bands while highly attenuating signals in the very high frequency band. Wherein said means connecting said sense signal input of said direction finding receiver is connected to the junction of said inductor and said capacitor.Ĥ.
Omnidirectional vlf receiver antenna series#
A combination antenna as claimed in claim 1 wherein said coupling circuit includes an inductor and a capacitor connected in series between said blade-like antenna and said communications transceiver with said capacitor adjacent said communications transceiver and
A combination antenna as claimed in claim 1 wherein said loop antenna includes a core of ferrite material in the form of a fixed flat plate and about which said windings are wound.ģ. Means connecting said loop antenna to said direction finding receiver andĪ molded unitary housing of insulating material enclosing both said loop and said blade antenna, said housing having a streamlined exterior contour and being generally T-shaped in a cross-section taken in a plane intersecting the planes of both said loop and blade antennas.Ģ. Means connecting the sense signal input of said direction finding receiver through said partial impedance of said coupling circuit to said blade-like antenna Means connecting said communications transceiver through said total impedance of said coupling circuit to said blade-like antenna
Omnidirectional vlf receiver antenna skin#
A combination communications, loop and sense antenna for a communications transceiver and an automatic direction finding radio receiver comprising:Ī fixed loop antenna having a pair of windings disposed at right angles to one another in plane form, and adapted for mounting on an aircraft with the plane of said loop antenna parallel and adjacent to the skin of the aircraft Ī blade-like antenna supported with the planes of said loop and said blade intersecting perpendicularly, an electrostatic shield extending substantially coextensive with and parallel to the surface of said loop, said shield being interposed between said loop and the end of said blade antenna adjacent said loop Ī coupling circuit for connecting said blade-like antenna to said communications transceiver and to said direction finding receiver to provide sense signals therefor, said coupling circuit having a total impedance which is relatively low to signals in the very high frequency band and a partial impedance which is relatively low to signals in the low frequency and broadcast bands
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