Green Bank Telescope 290 to 395 MHz Feed Analysis and Modification for Operation in the 140 to 175 MHz Band

摘要

A previously developed 290 to 395 MHz short backfire antenna feed for the Green Bank Telescope (GBT) has been modified for operation in the 140 to 175 MHz VHF band. The feed has been modeled with the Electromagnetic Surface Patch code, Version 5 (ESP5) software, developed at Ohio State University (OSU) to predict the feed radiation patterns and with OSU SatCom Workbench software to predict the GBT radiation patterns. Measured feed radiation patterns are in good agreement with the electromagnetic model. This lower-frequency VHF feed is suitable for use as a receive antenna for the GBT.