Accession Number : AD0719879

Title :   Backfire Antennas.

Descriptive Note : Final scientific rept. 1 Jul 67-31 Aug 70,

Corporate Author : TECHNICAL UNIV OF DENMARK LYNGBY LAB OF ELECTROMAGNETIC THEORY

Personal Author(s) : Nielsen,Erik Drago

Report Date : 20 SEP 1970

Pagination or Media Count : 50

Abstract : The research was restricted to surface wave structures consisting of dipole elements, especially the Yagi antenna structure. Two different ways of approach were investigated. In the first method, usual array theory was employed, the mutual impedances between the dipole elements were calculated according to the EMF method, and the radiation due to the presence of a large surface wave reflector of finite extent was determined from the surface current distribution on the plate. The second method is based on Harrington's Method of Moments, which is a theory for setting up a matrix solution to the problem by subdividing the whole antenna into small segments, over which a constant current may be assumed. Numerical results for Yagi backfire antennas and short-backfire antennas were compared with experimental results obtained in the Radio Anechoic Chamber, Technical University of Denmark. (Author)

Descriptors :   (*ANTENNAS, NUMERICAL ANALYSIS), YAGI ANTENNAS, ANTENNA RADIATION PATTERNS, REFLECTORS, COMPUTER PROGRAMS, DENMARK

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE