A Broadband Waveguide Calorimeter in the Frequency Range From 50 to 110 GHz

Calibration of mm-wave power meters using a broadband calorimeter in the frequency range from 110 GHz to 170 GHz

“…Here, the uncertainties of the scattering parameters that are required for the PDF calculation of P s are obtained using the result in [5]. Then, the PDF of K u was calculated using the model equation (1) by the Monte Carlo method with the model equation of P s given in [2]. The probabilistically symmetric 95% coverage interval corresponding to the relative uncertainty at 170 GHz was [+4.9, -5.0]%.…”

“…If the DC power P s0 is traceable to the SI units and the uncertainty related to the RF-DC power substitution can be reasonably evaluated, then the measured mm-wave power P s can be considered as SI traceable. The detailed operating principle of the calorimeter is described in [1], [2]. Figure 1 shows a typical time dependence of calorimeter response in the RF-DC power substitution measurement.…”

“…The black diamonds denote the calibration factors of the thermal-type power meter, and the open squares denote those of Schematic of the WR-6 waveguide calibration system. TFS and VCA denote the thermal feedback control system[1],[2] and a voltage controlled attenuator, respectively.…”

Development of a Type-N Coaxial Microcalorimeter for RF and Microwave Power Standards at KRISS

“…To achieve a seamless replacement of the microcalorimeter, we decided to develop a new type-N coaxial microcalorimeter in 2010. The structure of the new microcalorimeter is similar to our previous microcalorimeters [3], [4], and we referred to well-made calorimeters [7]- [10] to optimize the performance of the new one. It has a dry-type triple metal shield thermostat, twin adiabatic lines, and a thin-film thermopile module.…”

Theoretical Analysis and Determination of the Correction Factor for a Waveguide Microcalorimeter

“…Microcalorimeters have been recognized to be an effective solution for radio frequency (RF), microwave, and millimeter-wave power measurements [1][2][3], and have been successfully developed within the National Metrology Institutes worldwide over past few decades [4][5][6][7][8]. The main function and application of a microcalorimeter is to determine the effective efficiency η e of a transfer standard (e.g., a thermistor mount, and referred as a device under test (DUT) in this paper), and its correction factor g is found to be critical and has been studied in many different ways [9][10][11][12].…”