TT&C Upgrade of Sardinia Radio Telescope - BWG Optical Design Solutions and EMC with the Radio-Astronomy Receivers

The Sardinia Radio Telescope (SRT) is a fully steerable and versatile 64-m antenna, recently completed in Sardinia, Italy. SRT is currently commissioned by INAF. Following its upgrade to TT&C capabilities financed by ASI, SRT will be able to support communication to/from Deep Space probes. The paper deals with the preliminary analyses done in order to implement a TT&C BWG layout for X-band and Ka-band. The proposed BWG layout is optimized, using GRASP by TICRA, to compensate the beam squint phenomenon, which may occur with critical space missions. Consistent improvements are shown for Ka-band, which represents the most critical case. Moreover, the optical system of mirrors, together with the feeding structures are dimensioned to guarantee the electromagnetic compatibility (EMC) with the Radio-Astronomy instrumentation, for the nominal case and applying a beam squint correction through mechanical rotation of dedicated mirrors. Strategies and solutions, both mechanical and electromagnet