Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-01-27
1976-06-29
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343120, G01S 316
Patent
active
039672808
ABSTRACT:
An automatic radio direction finding system employing an integrated antenna unit containing both sense and loop antennas in a single compact enclosure. Signal processing circuitries by means of which a low-frequency switching modulation is imposed on one of the antennas, as well as broad-band R-F preamplification and signal combining circuitry for the antenna outputs, are accomplished within the unit. The combining circuit output in the antenna unit, and the remote receiver input, have impedances matching that of a standard coaxial cable interconnect, such that the voltage dividing action effected by conventional antenna cable interconnect means is removed, permitting a small sense antenna of considerably less H.sub.e C.sub.a product to provide necessary sensitivity. Critical antenna cable length requirements, with attendant installation difficulties, are obviated, and the antenna unit may be mounted on a wide variety of aircraft including those having physical size and performance characteristics which have heretofore precluded satisfactory ADF system installations.
REFERENCES:
patent: 2943323 (1960-06-01), Ryan
patent: 3150364 (1964-09-01), Green
patent: 3435455 (1969-03-01), Yello
Mayer Abbott F.
Morgan David J.
Anderson Richard W.
Berger Richard E.
Crawford Robert J.
Rockwell International Corporation
Wilbur Maynard R.
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