Phase directional antenna array and phased ring combiner for rad

Details Phase directional antenna array and phased ring combiner for rad Phase directional antenna array and phased ring combiner for rad

1980-09-09

1983-04-12

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343119, G01S 306

Patent

active

043800106

ABSTRACT:
A novel Direction Finding system is described, using a small aperture circular array of vertical dipoles, the outputs of which are rotated in phase by angles corresponding to their angular location on the array circle. A phased ring combiner is used to add the dipole pair outputs, giving two resultant waveforms, one advanced in phase and the other retarded by the same angle .theta., where .theta. is the relative bearing angle of the incoming signal. The phasing elements are made independent of the signal frequency either by the use of all-pass networks or by prior conversion to a fixed intermediate frequency. DF processing can be performed by a digital meter which computes the phase difference between the two resultant waveforms. In addition, an orthogonal DF display is available through a .SIGMA./.DELTA. conversion.

REFERENCES:
patent: 3104391 (1963-09-01), Hansel
patent: 3115633 (1963-12-01), Kramar et al.
patent: 3946395 (1976-03-01), Kirchhoff
patent: 4197542 (1980-04-01), Hofgen

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