Characteristics of Large Millimeter and Submillimeter Wave Reflecting Antennas.
Abstract
This document examines characteristics of large reflecting antennas at short (millimeter and submillimeter) wavelengths, emphasizing analysis of their susceptibility to interference from off-axis directions. Allowable deviations from the desired reflecting surface are measured in terms of wavelengths; and, the required tolerances become severe at millimeter and submillimeter wavelengths. Energy transmission at angles outside of main beam and the near sidelobes is due to energy from the feed not intercepted by the reflector (spillover), the diffraction pattern created by the reflector edge, energy scattered by the feed and its supports, and the interference patterns set up by the interaction of these three mechanisms. The far and back sidelobes of large reflecting antennas tend to diminish with increasing frequency, while the far sidelobe at the shadow boundary and the backlobe tend to remain constant.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1977
- Accession Number
- ADA047512
Entities
People
- West E. Katzenstein
Organizations
- Naval Air Weapons Station China Lake