Log-periodic longitudinal slot antenna array excited by a wavegu

Details Log-periodic longitudinal slot antenna array excited by a wavegu Log-periodic longitudinal slot antenna array excited by a wavegu

1975-06-23

1976-11-02

Smith, Alfred E.

Communications: radio wave antennas

Antennas

Slot type

3437925, 333 95R, 333 98R, H01Q 1310

Patent

active

039900797

ABSTRACT:
A log-periodic longitudinal slot antenna array comprises a dimensionally linearly tapered ridged waveguide having top and bottom walls, either forming part of a metallic ground plane and in which longitudinally elongated and spaced slots are formed. The long axis of each slot is parallel to the longitudinal component of the magnetic field in the waveguide and the slots have dimensions and inter-slot spacings which decrease in increments of a predetermined ratio .tau. in a direction toward the smaller end of the tapered waveguide. The antenna produces a fan-shaped beam with its narrow radiation pattern lying in the E-plane of the waveguide when fed at either the large or small end of the waveguide or both, the boresight axes of the resultant independent beams being different for the two feed points. For bi-directional radiation, a similar array of slots is formed in both the top and bottom walls of the waveguide either or both of which optionally may comprise extended ground planes.

REFERENCES:
patent: 2648839 (1953-08-01), Ford et al.
patent: 2929065 (1960-03-01), Kreinheder
patent: 3346865 (1967-10-01), Jones, Jr.
patent: 3530478 (1970-09-01), Corzine et al.
patent: 3555232 (1971-01-01), Bleackley
patent: 3604010 (1971-09-01), Schwartz
patent: 3633207 (1972-01-01), Ingerson

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