Abstract
This paper presents the extended results and prototype of the adiabatic copper conductor constructed with two interruption points in the external conductor layer, for use as a microcalorimeter power standard in wireless communication for a smart grid frequency range. Gaps are intended to drive down the thermal transfer from the outer environment into microcalorimeter and to reduce measurement inaccuracies in the microcalorimeter. The proposed design method is based on the combination of thermal and electromagnetic finite-element method simulations by which the desired line performance has been tailored. A prototype of the proposed adiabatic line has been manufactured and measurements on the prototype are presented along with the design procedure. Measured results are in line with the ones predicted by numerical calculations.
Highlights
Proper calibration of the radio-frequency (RF) sources applied in wireless communication for the smart grid is crucial for reliable and safe operation of the whole system [1]
The principle of a microcalorimeter power standard is to measure the temperature change on a bolometer load when a RF signal is on or off, by which the RF incident power appended to the bolometer can be measured
It consists of twin-line and bolometer load [2] encompassed into double-shielded housing
Summary
Proper calibration of the radio-frequency (RF) sources applied in wireless communication for the smart grid is crucial for reliable and safe operation of the whole system [1]. The thermistor mounts are equipped with type-N 50 Ω male connectors and they can measure microwave power spanning from 1 μW to 10 mW Both thermistors are fed by the equal adiabatic coaxial lines. Due to the identical adiabatic lines design, the measured temperature difference can be attributed to the active thermistor mount heating created by the RF power losses in its wall. To obtain the calibration factor, one needs to measure the reflection coefficient and the effective efficiency ηe The latter is found by placing detector into microcalorimeter. The g factor in (6) is an additional correction factor (since only a portion of applied microwave power is measured with the thermopile) and the accuracy of its determination is eventually related to measurement uncertainty of some power standard (it is, the critical part in microcalorimeter design [2]).
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
