Title :
Reflection-free microwave radiometer
Author_Institution :
Electrotech. Lab., Ibaraki, Japan
fDate :
4/1/1993 12:00:00 AM
Abstract :
A new microwave radiometer is proposed to make it possible to compare a noise source independently of its reflection coefficient. It is a modification of a correlation radiometer with a 3-dB, quadrature (90°) hybrid coupler instead of a 180° one as the input hybrid junction followed by a noise injection circuit for realizing temperature balance. Its principle, measurement procedure, and features are described
Keywords :
electric noise measurement; microwave measurement; radiometers; waveguide couplers; correlation radiometer; input hybrid junction; microwave radiometer; noise injection circuit; noise source; quadrature hybrid coupler; reflection coefficient; temperature balance; 1f noise; Circuit noise; Circulators; Correlators; Coupling circuits; Hybrid junctions; Microwave radiometry; Noise measurement; Reflection; Temperature measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
