High data rate frequency scan slotted waveguide antenna

Details High data rate frequency scan slotted waveguide antenna High data rate frequency scan slotted waveguide antenna

1977-02-04

1978-10-10

Lieberman, Eli

Communications: radio wave antennas

Antennas

Slot type

343771, 343854, H01Q 1310

Patent

active

041199715

ABSTRACT:
A frequency scan antenna utilizing either parallel or series beam spoiling for increasing the radar beam width and increasing the data rate is disclosed. As a radar beam is scanned from the horizon to a maximum altitude or angle above the horizon, the beam width is broadened or spoiled, thereby allowing a higher data rate collection and storage. A first embodiment according to the present invention utilizes coaxial cables of incrementally varying lengths connecting the delay line with an array of parallel line source radiators. The cables having the minimum length are connected at the extreme radiators while the maximum length cables are connected at the center line source radiators. The wavefront is bowed and a greater sector in space may be scanned. A second embodiment of the present invention utilizes a delay line with unequal tap spacings which is series coupled to the array of line source radiators. The time and consequently the phase delay of the signal applied to the delay line increases toward the upper radiators by incrementally increasing the length of the delay line segments coupled to subsequent radiators.

REFERENCES:
patent: 2676257 (1954-04-01), Hebenstreit
patent: 3434139 (1969-03-01), Algeo
patent: 3438035 (1969-04-01), Fling et al.
Croney; Doubly Dispersive Frequency Scanning Antenna; Microwave Journal; Jul. 1963, pp. 76, 77, 78, 79, 80.

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