Abstract
In this paper, a new high-temperature superconducting (HTS)-based microwave radiometer with an improved sensitivity is presented. The cryogenic receiver front end consists of an HTS filter and a cryogenic low noise amplifier (LNA). The cryogenic receiver front end shows an ultra-low noise figure and can suppress radio frequency interference (RFI) effectively. The proposed HTS filter works at a center frequency of 1.4135 GHz with a bandwidth of 25 MHz. The measured mid-band insertion loss, side band steepness, and out-of-band attenuation of the HTS filter are 0.14 dB, 35 dB/MHz, and 80 dB, respectively. The noise figure of the cryogenic LNA is about 0.27 dB at a temperature of 77 K. Compared with other total power radiometers, the proposed radiometer has a lower receiver noise temperature, which can improve the sensitivity with a short integration time of the satellite-based salinity meter. In addition, since the bandwidth of the salinity meter is fixed and the integration time of satellite-based equipment is limited, such a low receiver noise temperature can increase the flexibility of future satellite payload configuration program.
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Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 61171028, Grant No. 61176119, Grant No. 61471208, Grant No. 61841108), the Natural Science Foundation of Tianjin (No. 15JCQNJC01300), and the Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology.
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Wang, L.T., Xiong, Y., Xiao, Y.H. et al. A High-Order L-Band HTS Filter for Sensitive Detecting. J Supercond Nov Magn 32, 2849–2856 (2019). https://doi.org/10.1007/s10948-019-5070-z
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DOI: https://doi.org/10.1007/s10948-019-5070-z