I. Introduction
For -BAND radar applications, superconducting materials offer the advantages of miniaturization of the circuits by using high-permittivity substrates without deterioration of power loss performance. At 10 GHz, the surface resistance of thin film (YBCO) is in the order of at 77 K, while copper at the same temperature has an of approximately [1]. This low surface resistance in high-temperature superconductors (HTSs) translates into a longer range in radar receivers because the receiver sensitivity increases due to their lower noise figure compared to conventional technologies.