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This paper presents a brief discussion of the design and development of a new WR-10 (75 to 110 GHz) rectangular waveguide microcalorimeter recently fabricated at the National Institute of Metrology, China. The new microcalorimeter will serve as the national primary power measurement system in millimeter-wave range. In this paper, its capability to measure the effective efficiency of WR-10 transfer...
This paper presents a comparative evaluation of the contribution from thermal isolation section (TIS) of a rectangular waveguide microcalorimeter into its correction factor, through different modeling methodologies. Study shows that the ratio of power dissipated at the foil short inserted between thermistor mount (to be calibrated) and interface plate and that at the walls of TIS, determined through...
An improved design and simplified evaluation technique for waveguide microcalorimeter is presented in this paper. The design is based on a traditional twin-line microcalorimeter for calibrating thermistor mounts but with a proposed novel modification. In the improved design, another thermistor is added to measure the temperature change of the thermal isolation waveguide section. A simplified evaluation...
In this paper, we present some preliminary results from evaluation and validation of a national WR-15 (50 to 75 GHz) power measurement system, which has been upgraded for thermistor sensor (thermistor mount) measurements recently. The system is a physical realization of direct comparison transfer technique for microwave power sensor calibration. It has been evaluated and validated referring to a WR-15...
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