High temperature superconducting elliptic filters for UMTS Cryogenic Receiver

Abstract

High Temperature Superconducting (HTS) planar filters exhibit sharp skirts and very low insertion loss. Base station receivers with cooled low noise amplifiers and HTS filters can provide improved reduction of interference, better utilization of the spectrum and a higher signal to noise ratio. In this paper HTS filters for a UMTS cryogenic receiver are presented. The filters are based on an elliptic design and fabricated using YBCO coated sapphire substrates. The measured noise figure of a nine pole UMTS filter with a low noise amplifier doe not exceed 0.7dB

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