Circular log-periodic direction-finder array

Details Circular log-periodic direction-finder array Circular log-periodic direction-finder array

1984-04-18

1986-06-10

Lieberman, Eli

Communications: radio wave antennas

Antennas

Slot type

3437925, H01Q 1110

Patent

active

045945950

ABSTRACT:
A circular frequency-independent antenna array (10) includes a plurality of radially extending log-periodic subarrays (12, 14, 16, 18, 20, and 22) of slot radiators (26) provided in a ground-plane conductor (28). Associated with each slot is a cavity (34) into which the slot opens. A traveling-wave element in the form of a wire (30) cooperates with a ground-plane conductor (28) in which the slots are provided to support propagation of an electromagnetic signal. The signal is radiated upon encountering a slot that resonates at a frequency near that of the signal, and the depths of the cavities are adjusted so that the phase relationships between the radiation from the slots and the signal propagated along the traveling-wave element results in an antenna pattern that launches radiation in a direction away from the center of the array. Direction-finding errors are reduced because interference between the several subarrays is kept to a minimum.

REFERENCES:
patent: 2981949 (1961-04-01), Elliott
patent: 3218644 (1965-11-01), Berry
patent: 3369243 (1968-02-01), Greiser
patent: 3530478 (1970-09-01), Corzine et al.
patent: 3633207 (1972-01-01), Ingerson et al.
patent: 4360816 (1971-07-01), Corzine

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