Title :
High dynamic range 140??220 GHz radiometer using dual-channel superheterodyne receivers
Author_Institution :
Nat. Metrol. Centre, A*STAR, Singapore, Singapore
Abstract :
A millimetre-wave radiometer in the range 140-220-GHz using dual-channel superheterodyne receivers is described. The dynamic range of the radiometer is estimated to be 163-dB. The linearity of the receiver is traceable to a low-frequency voltage ratio standard. A 10-120-dB synthesised rotary vane attenuator has been measured with uncertainties of 0.022-0.90-dB at 220-GHz to verify the accuracy of the radiometer.
Keywords :
attenuators; millimetre wave measurement; radiometers; superheterodyne receivers; dual channel superheterodyne receivers; frequency 140 GHz to 220 GHz; high dynamic range radiometer; millimetre wave radiometer; rotary vane attenuator;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2011.2066
