Accession Number : AD0680241

Title :   ELECTROMAGNETIC INTERFERENCE MEASUREMENT METHODOLOGY, COMMUNICATION EQUIPMENT.

Descriptive Note : Quarterly rept. no. 2, 1 May-31 Jul 68,

Corporate Author : GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION

Personal Author(s) : Free,William R. ; Jenkins,Bernard M. ; Stuckey,Charles W.

Report Date : DEC 1968

Pagination or Media Count : 37

Abstract : Theoretical and experimental investigations directed toward the development of improved test techniques and procedures for performing radiated measurements in shielded enclosures continued during this reporting period. A theory to explain the presence of coupling nulls in shielded enclosures at low frequencies (below 100 MHz) was developed during the previous quarter. A series of measurements was performed during this reporting period to validate this theory. The results from these measurements demonstrate that the coupling nulls observed in the shielded enclosure in the vicinity of 40 MHz are not the result of multi-path reflections from the enclosure walls. In addition, the measurement results are consistent with the previously developed near-field coupling theory. An experimental program to develop short hooded antennas which yield constant beamwidth patterns over an appreciable frequency range was continued during this reporting period. Results obtained with two experimental short hooded antennas designed to cover the 1 to 12 GHz frequency range are presented and discussed. (Author)

Descriptors :   (*COMMUNICATION EQUIPMENT, *RADIOFREQUENCY INTERFERENCE), ANTENNAS, ELECTROMAGNETIC SHIELDING, MEASUREMENT, TEST METHODS, ANTENNA RADIATION PATTERNS, SHELTERS

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE