Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-05-09
1979-03-06
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 736
Patent
active
041433750
ABSTRACT:
In the method, useful signals from an originating station are enveloped by counter-counter measure additional signals, independent of the useful signals, transmitted from the originating station independent of the locating and transmission system, and effective to force a jammer, having a limited available jamming power, to diminish or shift the density of its spectral jamming output. The useful signals are enveloped in a time range, a frequency range, and/or a spatial range, and the useful signals and the additional signals may have frequencies which differ from each other. In one embodiment of the apparatus, the useful signals and the additional signals are supplied to respective inputs of a multiplexer whose output is connected to a transmitter connected to a radiator which may be either an optical radiator or an electromagnetic radiator. In another embodiment, the two signals are supplied to respective transmitters, with the superposition of a synchronous control signal from a timing generator, and the two transmitters are connected to a coupler in turn connected to the radiator. In a third embodiment of the apparatus, the two signals are supplied to respective inputs of a frequency dividing network connected to the radiator. In a further embodiment of the invention, the useful signals and the additional signals are supplied to respective radiators, with the radiator radiating the useful signals having a narrow lobar characteristic and the radiator radiating the additional signals having a wide lobar characteristic enveloping the narrow lobar characteristic.
REFERENCES:
patent: 3163862 (1964-12-01), Jenny
patent: 3858219 (1974-12-01), Hull
patent: 3866224 (1975-02-01), Porter et al.
patent: 3878525 (1975-04-01), Alpers
patent: 3947848 (1976-03-01), Carnahan et al.
patent: 3981013 (1976-09-01), Christensen
patent: 4038659 (1977-07-01), Hamer et al.
Goodwin Lawrence
Messerschmitt-Bolkow-Blohm
Wilbur Maynard R.
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