STUDY OF SPECIAL BEAMSHAPING ANTENNAS.
Abstract
Efforts were directed to investigation of the applicability of end-fire dielectric elements in easily transportable satellite communications antenna arrays and in primary feed systems. Ray-Tracing Theory which was originally employed to predict the effects of element shape on radiation characteristics has provided several bonus discoveries. It has resulted in a simple new concept which explains the optimum length criterion for end-fire antennas. The requisite characteristics for optimum exciters for dielectric wave-guides have also been derived from this theory. This theory has led to the conception of a new and novel type of antenna, the ThreeDimensional Zone Plate. A Foamrod Antenna which provides the highest gain and lowest sidelobes ever achieved with a single end-fire element is described in the report. The resulting gain and maximum sidelobe level are 35 db and -23 db respectively. The feasibility of producing a high-gain Dielectric Tube Antenna has also been demonstrated. Based on primary feed amplitude and phase measurements, it appears that these elements will make highly efficient primary feeds. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1963
- Accession Number
- AD0429052
Entities
People
- B. L. Lewis
- G. W. Collins
- H. E. Bartlett
- L. Pietsch
- R. E. Moseley