Communications: radio wave antennas – Antennas – Slot type
Patent
1975-06-23
1976-10-19
Smith, Alfred E.
Communications: radio wave antennas
Antennas
Slot type
3437925, 333 95R, 333 98R, H01Q 1310
Patent
active
039874540
ABSTRACT:
A log-periodic longitudinal slot antenna array comprises a dimensionally linearly tapered ridged waveguide having a wall forming part of a metallic ground plane and in which longitudinally elongated and spaced slots are formed. The long axis of each slot is perpendicular to the transverse component of the magnetic field in the waveguide and the slots have dimensions and inner-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 narrowest radiation pattern lying in a plane perpendicular to a line parallel to the transverse magnetic field component in the waveguide. Such fan-shaped beams are obtainable when the antenna structure is fed at either the large or small ends of the waveguide, or at both ends, in which cases the boresight axes of the resultant beams extend in different directions. The distinguishing physical feature of unidirectional versions of the antenna relative to unidirectional versions in the antenna array family described in the herein identified cross-reference application is that all of the slot radiators are displaced to one side or to the other of the electric (E) plane of the waveguide but never to both of these sides. As such, the corresponding distinguishing electrical feature is that all sub-components of the time-phases of the electric field excitations in all slots due solely to the transverse locations of the slots are intrinsically identical.
For bi-directional radiation patterns, a similar array of slots is formed in the opposite wall of the waveguide which optionally may comprise an extended ground plane.
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), Cozine
patent: 3555232 (1971-01-01), Bleackley
patent: 3604010 (1971-09-01), Schwartz
patent: 3633207 (1972-01-01), Ingerson
GTE Sylvania Inc.
Moore David K.
Smith Alfred E.
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