Cryogenic design and analysis for a Vivaldi antenna array receiver postprint

Abstract: The sensitivity of a phased array receiver can be enhanced by cryogenically cooling either its low-noise amplifiers or its front-end antenna array. This study addresses the cryogenic cooling requirements of phased array receivers. Based on a laboratory-based prototype broadband Vivaldi antenna array, we have designed a Dewar system adopting a full-array integrated cooling approach. Through thermal load analysis of the internal cryogenic structure and comparison with measured cooling temperatures from a prototype, we have validated a structural design while identifying areas for improvement. This work provides valuable insights for future integrated cooling and sensitivity optimization of phased array receivers equipped with cryogenic low-noise amplifiers.