PRIMARY PATTERN MEASURE OF A LINE SOURCE FEED FOR A SPHERICAL REFLECTOR
Abstract
IN DESIGNING A LINE SOURCE FEED FOR A SPHERICAL REFLECTOR, IT IS CUSTOMARY TO DETERMINE THE FIELD DISTRIBUTION ACROSS THE APERTURE BY MEASURING THE PRIMARY PATTERN (amplitude and phase of the field on the surface of the reflector) of the line source. This measurement becomes extremely difficult when the reflector is large since either a precision circular track or a long rigid beam is required. Using geometric optics it is shown that the amplitude and phase at the aperture can be determined from the amplitude and phase measured when the line source is rotated about its paraxial focus. Since all that is required to make the measurement is a turntable and a stationary pickup probe, the experimental setup is considerably simplified. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1961
- Accession Number
- AD0267014
Entities
People
- Edward E. Altshuler
Organizations
- Air Force Cambridge Research Laboratories