Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Patent
1974-06-03
1976-01-27
Lieberman, Eli
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
343106R, 343818, 343833, H01Q 312, G01S 144
Patent
active
039355764
ABSTRACT:
Tactical radio navigation systems provide bearing information to an interrogating aircraft in response to pairs of interrogation pulses received at a beacon transponder, the system also provides distance measuring and identification information. To provide the required bearing information, pulses radiated from the central antenna array are modulated at a 15 Hz frequency and by 135 Hz frequency, by parasitic elements rotating around a stationary central array. Broadband operation of the system is provided by a distribution pattern of the 135 Hz parasitic elements mounted radially from the central antenna array on a dielectric disc. Nine groups of radially displaced 135 Hz elements are circumferentially arranged around the dielectric disc and each element of a group is tailored to a particular frequency band in the frequency spectrum allotted to radio navigation systems.
REFERENCES:
patent: 2912693 (1959-11-01), Lucanera et al.
patent: 2928087 (1960-03-01), Parker
patent: 3136996 (1964-06-01), Parker
patent: 3524191 (1970-08-01), Ehrenspeck
E-Systems Inc.
Lieberman Eli
Wilder Robert V.
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