Intrusion sensor and aerial therefor

Details Intrusion sensor and aerial therefor Intrusion sensor and aerial therefor

1977-06-06

1980-03-04

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

343 5PD, 343771, G08B 1318

Patent

active

041919530

ABSTRACT:
Perimeter protection in a security installation is achieved by detecting disturbances in a microwave beam sent from a transmitter to a receiver. The transmitter and receiver have associated beam antennas of extended vertical aperture of not less than 0.75 meters to mitigate the effects of ground reflection. The antennas are preferably slotted waveguide arrays and the advantages of using circular polarization are shown. Circularly-polarized slotted waveguide arrays are disclosed having a center feed to minimize frequency dependent beam-spreading.

REFERENCES:
patent: 2937373 (1960-05-01), Carter
patent: 3328800 (1967-06-01), Algeo
patent: 3456261 (1969-07-01), Crumpen
patent: 3691556 (1972-09-01), Bloice
patent: 3877002 (1975-04-01), Cheal et al.
Terman, F. E., Radio Engineers Handbook, McGraw-Hill Book Co., Inc., New York, 1943, pp. 824-825 & 828-829.

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