Accession Number:

AD0412939

Title:

INVESTIGATION OF IMPROVED AIRBORNE ANTENNA TECHNIQUES FOR COMBAT SURVEILLANCE,

Descriptive Note:

Quarterly progress rept. no. 4, 1 Mar-31 May 63,

Corporate Author:

ADVANCED TECHNOLOGY CORP TIMONIUM MD

Personal Author(s):

• Littlepage,ARobert S.

Report Date:

1963-06-28

Pagination or Media Count:

21.0

Abstract:

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

Descriptors:

• *AIRCRAFT ANTENNAS
• COMBAT SURVEILLANCE
• SLOT ANTENNAS
• ANTENNA RADIATION PATTERNS
• COUPLED ANTENNAS

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE