Accession Number : AD0885848

Title :   Experimental Studies on a 13-Element Interdigital Array Antenna.

Descriptive Note : Technical rept.,

Corporate Author : MICHIGAN UNIV ANN ARBOR RADIATION LAB

Personal Author(s) : Lyon, John A. M. ; Parker, William W.

Report Date : JUN 1971

Pagination or Media Count : 37

Abstract : Experimental studies on a 13-element center-fed interdigital array antenna ae described. In a previous report (AD-871 265) a theoretical analysis was presented for this type of antenna. The antenna consists of 13 finger-like elements lying in a plane with the elements parallel to one another. The single driven element can be considered to be a toppled monopole with six parasitic toppled monopoles on either side of the driven element. At the lower range of frequencies the antenna provides a broadside plum-shaped pattern. At higher frequencies there is some end-fire radiation and a split-beam pattern is ultimately observed. Numerous radiation patterns and data on the relative gain are presented. The range of gain is 6 to 16 dB below a half wave resonant dipole. Arguments are presented which indicate that the reported gain is very conservative because of a number of factors; it is expected that the actual gain is higher than recorded. The VSWR is less than 2 over a frequency range from 400 to 650 MHz, the recommended range for broadside operation. The radiation patterns also show a very low side lobe and back lobe level for the frequency range. (Author)

Descriptors :   (*ANTENNA ARRAYS, ANTENNA RADIATION PATTERNS), ELECTRICAL IMPEDANCE, GAIN, ULTRAHIGH FREQUENCY, POLARIZATION, DIGITAL SYSTEMS.

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE