Citation
Abstract
Concern has been raised for the 64-m to 70-m antenna upgrade project that the 70-m system may experience greater S-band beam-pointing perturbations than the 64-m system. The S-band perturbations are due to minor (higher order) mode generation, causing subtle cross-polarization fields affecting beam pointing direction, as described herein. For the antennas in their present configuration (64 m), a slight S-band gain degradation of about 0.05 dB can be attributed to these effects. Therefore, a full physical optics analysis was performed for the present-day 64-m system, as described herein. The results were compared with past analyses and experimental observations in order to verify the algebra and computer code with the intent of deriving a valid analysis method for accurately analyzing the 70-m shaped dual-reflector Cassegrainian antenna. The results of the new analysis appear to be in excellent agreement with previous analyses and experimental data, and extension of the analysis methods to the 70-m system will follow in a second article.
Details
- Volume
- 42-84
- Published
- February 15, 1986
- Pages
- 94–100
- File Size
- 381.6 KB