Citation
Abstract
This article presents the derivation of a new formula for calculating the noise temperature of mirrors in cascade in a beam-waveguide (BWG) system. Resistive and spillover losses of each mirror are taken into account. No simplifying assumptions are made, and loss factors are not assumed to be unity. Comparison of noise temperatures calculated by the new formula and a simpler approximate formula (used by other authors in the past) shows negligible differences when used to calculate noise temperatures of cascaded low-loss mirrors such as those in current Deep Space Network BWG antenna systems.
Keywords
noise temperature
cascaded mirrors
resistive losses
spillover losses
DSN antennas
BWG antennas
Details
- Volume
- 42-155
- Published
- November 15, 2003
- Pages
- 1–9
- File Size
- 105.1 KB