Communications: radio wave antennas – Antennas – With coupling network or impedance in the leadin
Patent
1975-05-30
1976-06-22
Borchelt, Archie R.
Communications: radio wave antennas
Antennas
With coupling network or impedance in the leadin
343779, 343755, H01Q 326
Patent
active
039654753
ABSTRACT:
In a switchable beamwidth monopulse method and system, an antenna comprising a curved reflector and a first set of monopulse feeds positioned in the effective region of the Airy disc of the antenna includes a second set of monopulse feeds. The second set of monopulse feeds is positioned outside the Airy disc in the region of first bright Airy ring. In narrow beamwidth monopulse operation, monopulse sum and difference channel patterns are obtained from the first set of feeds within the Airy disc. In wide beamwidth monopulse operation, the difference channel pattern is obtained from the second set of feeds in the Airy ring; the sum channel pattern is obtained by attenuation and phase shifting the sum channel signal obtained from the first set of feeds, and adding the resultant to the sum channel signal obtained from the second set of feeds. In a simplified form of the invention, the difference channel patterns for both narrow and wide beamwidth mode operation are obtained from the second set of feeds, while the sum channel patterns are obtained as described above.
REFERENCES:
patent: 3164835 (1965-01-01), Alsberg
patent: 3307189 (1967-02-01), Meade
patent: 3364490 (1968-01-01), Hannan
Deerkoski Leonard F.
Schmidt Richard F.
Borchelt Archie R.
Chin Tommy P.
Grafel Gary F.
Manning John R.
Sandler Ronald F.
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