Instrument landing system glidepath antenna array and drive ther

Details Instrument landing system glidepath antenna array and drive ther Instrument landing system glidepath antenna array and drive ther

1977-11-04

1979-09-11

Lieberman, Eli

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

343107, H01Q 326, G01S 108

Patent

active

041677390

ABSTRACT:
An instrument landing system (ILS) glidepath antenna array and drive therefor which provides for lower susceptibility to above-ground interference and higher stability than the known M-array system. The antenna array also provides for a shorter image ground requirement than the known null reference and sideband reference systems. The antenna array comprises a four-element structure, two of which are driven with CBS only signals having relatively different amplitude and phase, and the other two elements of which are driven with SBO only signals having relatively different amplitude and phase.

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