SiGe HBT-Based Active Cold Load for Radiometer Calibration
Authors:
- 11 March 2010
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Microwave and Wireless Components Letters
- Vol. 20 (4) , 238-240
Abstract
An active cold load (ACL) using SiGe heterojunction bipolar transistor (HBT) has been realized at L-band for radiometer calibration. A hybrid circuit has been realized with a discrete transistor, lumped elements and microstrip transmission lines. The ACL exhibits return loss higher than 30 dB and a noise temperature less than 65 K in the L- band (1400-1427 MHz). The ambient temperature sensitivity is less than 0.3 K/°C.Keywords
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