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INVESTIGATION OF IMPROVED AIRBORNE ANTENNA TECHNIQUES FOR COMBAT SURVEILLANCE,
Quarterly progress rept. no. 4, 1 Mar-31 May 63,
ADVANCED TECHNOLOGY CORP TIMONIUM MD
Pagination or Media Count:
A 10 x 2 element surface wave excited slot array has been designed, based on single slot data, to have a constant amplitude illumination. Pattern measurements in both the E and H planes are in very good agreement with the predicted patterns. Mutual coupling was not a problem in this small array. This initial array plate was inverted, resulting in an exponentially illuminated 10 x 2 element array. Here the measured pattern was not in good agreement with the pattern determined by analysis. A possible explanation is given. An exponential taper to a thin dielectric tape was investigated and resulted in a more efficient transition from a tight to a loosely bound sur face wave within the trough waveguide. Using this improved taper, fields of high purity ex tend to heights of at least eighteen wavelengths. Author
APPROVED FOR PUBLIC RELEASE