Accession Number : AD0289532

Title :   INVESTIGATION OF ANTENNAS WITH RESPECT TO ENVIRONMENTAL DISTURBANCES IN THE NEAR FIELD (PART I)

Descriptive Note : Research rept.

Corporate Author : ARMY ENGINEER RESEARCH AND DEVELOPMENT LABS FORT BELVOIR VA

Personal Author(s) : ROHDE,FRIEDRICH W.

Report Date : 06 JUN 1962

Pagination or Media Count : 111

Abstract : Investigations are presented of the near field of antennas in support of the problems arising in mine detection. The concept of the near field is explained in a general way, and theoretical and experimental methods to investigate the near field are discussed. Some measurements of the disturbed and undisturbed near field are described, and the results are analyzed. Experiments conducted in the minefield have shown that simplified concepts are not adequate for a satisfactory explanation of the phenomena. It was assumed that any antenna has a field of a more or less complicated structure in its near environment and that the presence of the ground and mines changes the field and the radiation properties of the antenna. These considerations led to a thorough study of antenna near fields and their variations resulting from the presence of obstacles. (Author)

Descriptors :   *ANTENNA RADIATION PATTERNS, *ELECTROMAGNETIC RADIATION, *LAND MINES, *MINE DETECTORS, *WAVE PROPAGATION, DIPOLE ANTENNAS, ELECTROMAGNETIC FIELDS, ELECTROMAGNETISM, EXPERIMENTAL DATA, MICROWAVE EQUIPMENT, MICROWAVE FREQUENCY, S BAND, STANDING WAVE RATIOS

Distribution Statement : APPROVED FOR PUBLIC RELEASE