Accession Number : ADA016986

Title :   Investigation of the Gain Measured in Periodic Slotted Surfaces.

Descriptive Note : Interim technical rept.,


Personal Author(s) : Fulton,R. D.

Report Date : MAR 1975

Pagination or Media Count : 39

Abstract : For some time now measurements of planar arrays of slots have shown gain (transmission coefficients greater than unity) at high angles of incidence. The report is a summary of an investigation to determine why gain has been measured since conservation of energy prohibits amplification by such an array. Two possible causes are considered: (1) Focusing by the array, and (2) diffraction from the aperture in the ground plane used for carrying out the measurements. Results of analytical investigations and measurements indicate that edge diffraction is the cause. This work is significant to the Air Force because it will allow greater accuracy in and understanding of measurements made on slotted surfaces such as used for metallic radomes.

Descriptors :   *Radomes, *Slots, Electromagnetic wave propagation, Planar structures, Arrays, Gain, Antenna apertures, Radio transmission, Radomes

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE