An active cold load (ACL) and an active hot load (AHL) circuit were developed in W-band (75 - 110 GHz) and manufactured in IAF's metamorphic high electron mobility transistor (mHEMT) technology. The millimeter-wave monolithic integrated circuits (MMICs) were radiometricly characterized with a dedicated hot cold on wafer noise measurement setup and packaged into waveguide modules. The active load modules were then again characterized, to be used as reference loads in radiometry systems with switching front-ends [1]

A W-band Dicke type radiometer with an MMIC single-pole-five-throw (SP5T) switch front-end and a Schottky diode detector is presented. The radiometer is intended to test active W-band loads as well as to generate passive millimeter wave imagery. By applying active or conventional hot and cold loads to the spare input ports of the SP5T, the radiometer can switch between the antenna, the external reference loads, and a monolithic integrated 50 load. Hence, accurate radiometric multi-load calibration can be performed as well as standard Dicke operation

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