SIDE-LOBE POWER-LEVEL PROBABILITIES FOR MATCHED AND UNMATCHED POLARIZATIONS,
Abstract
This investigation analyses antenna side-lobe radiation pattern measurements of a particular parabolic reflector-type antenna system to estab lish side-lobe power-level probabilities for both linearly and circularly ''matched'' and ''un matched'' polarization. A basic, simplifying approximation was made, namely, that a principal plane pattern is essentially a ''figure of revo lution'' about the main-beam axis. Three regions away from the main beam were considered: the angular region from the first side-lobes to =30 degrees, from =30 to =90 degrees, and from =90 to =180 degrees. Test results disclosed that within the first angular region, coupling with an incident wave either matched to or orthogonally polarized to the main-beam polarization produced similar results. Within the second and third angular regions, reasonably close correlation of side-lobe power levels was obtained between linearly matched and opposite circular-sense conditions; similarly, linear cross-polarized coupling behaved like circular same-sense cou pling indicating that in the far-out regions the principal source of side-lobe power was ill over from the feed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 22, 1963
- Accession Number
- AD0418367
Entities
People
- Charles F. Hummel
- Raymond E. Franks
Organizations
- Sylvania Electric Products