Multipath discriminating antenna system

Details Multipath discriminating antenna system Multipath discriminating antenna system

1980-05-09

1981-05-19

Lieberman, Eli

Communications: radio wave antennas

Antennas

Wave guide type

343100PE, H01Q 1302, G01S 116

Patent

active

042688329

ABSTRACT:
To reduce guidance errors in a microwave landing system from false signals eflected by objects along runways, the transmitting antenna radiates an elliptically polarized beam. At the airborne receiver an antenna, such as a pyramidal horn, maintains the separation of the horizontal and vertical components. These components are separated and then split on an equal power basis. One part of the vertical field component is shifted by 90 degrees and added to one part of the horizontal component in a detector, whose output is in effect like that of a circularly polarized receiver. The other parts of the horizontal and vertical components are separately detected. The outputs of the three detectors are combined in a multiplier, to yield a resultant output. For a very broad angular distribution the undesired reflected signals are strongly attenuated.

REFERENCES:
patent: 3827051 (1974-07-01), Foldes

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