Accession Number : AD0704563

Title :   INVESTIGATION OF USE OF SUPERIMPOSED SURFACE WAVE MODES.

Descriptive Note : Final rept. (Part 4), 1 Mar 68-31 Jan 70,

Corporate Author : HUGHES AIRCRAFT CO FULLERTON CALIF GROUND SYSTEMS GROUP

Personal Author(s) : Wong,Nam S. ; Tang,Raymond ; Okubo,George H. ; Lee,Shung-Wu

Report Date : 01 FEB 1970

Pagination or Media Count : 92

Abstract : A method of achieving a matched aperture in phased arrays over a wide range of scan angle has been investigated. This method uses two or more propagating modes in each array element such that the reflections of these modes from the array aperture produce a cancellation effect at the element driving terminal. An experimental 256 element planar array was constructed to demonstrate this technique. Each radiating element consists of an open-ended waveguide driven by an end-on coaxial transition. Modal amplitude control of higher order modes is accomplished by means of either a perforated dielectric slab or an inductive iris at the aperture. (Author)

Descriptors :   (*PHASED ARRAYS, IMPEDANCE MATCHING), WAVEGUIDES, DIELECTRICS, ANTENNA FEEDS, SCANNING, STANDING WAVE RATIOS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE