Accession Number : AD0603196

Title :   EXPERIMENTAL STUDY OF MUTUAL COUPLING BETWEEN ELEMENTS OF A WIDE APERTURE RADIO LOCATION ANTENNA.

Descriptive Note : Technical rept. no. 3,

Corporate Author : ILLINOIS UNIV URBANA ENGINEERING EXPERIMENT STATION

Personal Author(s) : Ore,Fred

Report Date : JUN 1964

Pagination or Media Count : 24

Abstract : This investigation demonstrated some of the effects of mutual coupling on the impedance characteristics of an element of the large circular array being considered. It was shown that the minimum practical spacing between phase centers of adjacent elements of the array is on the order of 3/16 lambda with an even wider spacing being desirable. In addition, the investigation showed that the impedance characteristics of an element are severely deteriorated over approximately a 15 percent band just below the frequency where a new band is to begin. Since the completion of this investigation, a combination theoretical and experimental investigation has been conducted on a 500:1 scale pattern model to determine a low frequency limit element spacing based on acceptable radiation pattern performance. (See AD-429 235) Thus, from this impedance investigation and from the pattern investigation, it would appear that the low frequency limit adjacent phase center spacing must be on the order of .175 lambda if the acceptable pattern performance with the impedance performance as described is to be achieved.

Descriptors :   (*COUPLED ANTENNAS, ANTENNAS), (*ANTENNAS, DIRECTION FINDING), (*DIRECTION FINDING, ANTENNAS), BROADBAND, EXPERIMENTAL DATA, ANTENNA SIMULATORS, ELECTRICAL IMPEDANCE, MODEL TESTS, LOG PERIODIC ANTENNAS, ANTENNA RADIATION PATTERNS

Distribution Statement : APPROVED FOR PUBLIC RELEASE