Accession Number : AD0600652

Title :   APPLICATION OF ELECTROMAGNETIC ABSORBING MATERIALS AS INTERFERENCE REDUCTION TECHNIQUES.

Descriptive Note : Final engineering rept.

Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB

Personal Author(s) : Peters,Leon ,Jr. ; Rudduck,Roger C.

Report Date : APR 1964

Pagination or Media Count : 35

Abstract : Means of controlling undesired radiation of antennas for reduction of radio frequency interference are given for three antennas: the horn, the parabola, and the Luneberg lens. The radiation mechanisms of each antenna are obtained and used as a guide line for this reduction. A new approach for finding the diffraction by thick edges has been developed and is used to determine the radiation patterns of horn antennas. It has been shown that back radiation for the horn may be reduced by reducing the energy incident on these edges. Choke joints have been used for this purpose, and are proposed as a method for increasing the effectiveness of shielding screens. A method is given for creating nulls in the Fresnel zone of an antenna by use of a small amount of absorber material. (Author)

Descriptors :   (*ANTENNA RADIATION PATTERNS, RADIOFREQUENCY INTERFERENCE), (*RADIOFREQUENCY INTERFERENCE, REDUCTION), HORN ANTENNAS, PARABOLIC ANTENNAS, LUNEBERG LENS ANTENNAS, ELECTROMAGNETIC RADIATION, ABSORPTION, MATERIALS

Distribution Statement : APPROVED FOR PUBLIC RELEASE