Noise Temperatures and Gain Losses due to Leakage through Deep Space Network Antenna Perforated Panels at and above 32 Gigahertz
Abstract
This article presents results of studying noise-temperature contributions due to leakage through the holes on perforated panels of the 34-m beam-waveguide (BWG) and 70-m antennas at 32 GHz and above. The noise-temperature contributions for the 34-m BWG antenna were 0.4 K at 32 GHz and increased to about 6 K at 45 GHz. For the 70-m antenna, the noise-temperature contribution was 0.8 K at 32 GHz and increased to about 16.4 K at 47 GHz. The highest frequencies at which the antennas were free of grating lobes were 45 GHz for the 34-m BWG antenna and 47 GHz for the 70-m antenna. It is conventional practice not to use antennas at and above any frequency at which grating lobes are generated.
- Publication:
-
Interplanetary Network Progress Report
- Pub Date:
- July 2002
- Bibcode:
- 2002IPNPR.151E...1O