Direct comparison transfer of microwave power sensor calibrations

Weidman, M.P.

doi:10.6028/nist.tn.1379

Cited by 49 publications

(31 citation statements)

References 6 publications

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“…Its performance was evaluated by the GUM and the MCM. The observed good agreements (all the |E n | ≤ 0.25) demonstrate the capability of the calibration model in (1). However, to be a reliable model for providing the calibration services to the industry, calibration scenarios using other adaptors (e.g., female to male adaptor, coaxial to waveguide adaptor etc.)…”

Section: Discussionmentioning

confidence: 99%

“…Direct comparison transfer technique has been widely used for microwave power sensor calibrations [1][2][3][4] since it was proposed by the National Institute of Standards and Technology, USA [1]. This technique, as shown in Figure 1(a), consists of a power source (microwave synthesizer) and a 3-port splitter or coupler which is used to minimize the source mismatch [5].…”

Section: Introductionmentioning

confidence: 99%

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Direct Comparison Transfer of Microwave Power Sensor Calibration With an Adaptor: Modeling and Evaluation

Zhang¹,

Meng²,

Shan³

et al. 2013

PIER Letters

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Abstract-In this paper, calibration of a microwave power sensor with an adaptor is investigated with direct comparison transfer technique, and mathematically modeled using signal flow-graphs together with non-touching loop rules. The developed calibration model is then implemented practically with a 30 dB attenuator as the adaptor. Its performance is evaluated following the Guide to the Expression of Uncertainty in Measurement and also verified with the Monte Carlo method. Good agreements are observed with all the error |E n | ≤ 0.25 over the whole frequency range (up to 18 GHz).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct Comparison Transfer of Microwave Power Sensor Calibration With an Adaptor: Modeling and Evaluation

Zhang¹,

Meng²,

Shan³

et al. 2013

PIER Letters

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show abstract

“…The expanded uncertainty discussed in this study is reasonably relaxed to increase reliability, and the resultant uncertainty is posted as the calibration and measurement capabilities on the International Bureau of Weights and Measures webpage [10]. The RF and microwave power standards discussed in this study are disseminated to domestic and foreign users by the direct comparison technique [11]. These standards ultimately help users to measure the related quantities with reliability.…”

Section: Measurements and Resultsmentioning

confidence: 99%

RF and Microwave Power Standards from 10 MHz to 40 GHz over Decades

Kang

Kwon

Park

et al. 2018

J Electromagn Eng Sci

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Radio frequency (RF) and microwave power is one of the key quantities in the framework of electromagnetic measurement standards. Therefore, the stability of the power standard is essential to users' reliable measurements in various areas. Coaxial and waveguide thermistor mounts are used as transfer standards of RF and microwave power. Over decades, the effective efficiencies of thermistor mounts have been measured using coaxial and waveguide microcalorimeters in the frequency range of 10 MHz-40 GHz. The measurement uncertainty of the effective efficiency is evaluated. Results show that the power standards have been well maintained within the measurement uncertainty.Key Words: Effective Efficiency, Measurement Standard, Microcalorimeter, Power, Thermistor Mount. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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“…Also best accuracy is usually provided by thermistor type detectors at these frequencies [2]. By including thermistor as one arm of a 4-arm balanced bridge, DC or low-frequency AC power is drawn as RF/ MW/ MMW power is applied, maintaining the bridge balance and yielding a substitution value of power [3]. Recently, signal & sweep generators, scalar & vector network analyzers, thermistor mounts and direct reading attenuators, etc.…”

mentioning

confidence: 99%

Design and Development of Thermistor based Power Meter at 140 GHz Frequency Band

Roy

Kush

Dixit

2011

J Infrared Milli Terahz Waves

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Design and development of thermistor based power meter at 140 gigahertz (GHz) frequency band have been presented. Power meter comprises power sensor, amplifier circuit and dialog based graphical user interface in visual C++ for the average power measurement. The output power level of a component or system is very critical design factor. Thus there was a need of a power meter for the development of millimeter wave components at 140 GHz frequency band. Power sensor has been designed and developed using NTC (Negative Temperature Coefficient) thermistors. The design aims at developing a direct, simple and inexpensive power meter that can be used to measure absolute power at 140 GHz frequency band. Due to absorption of 140 GHz frequencies, resistance of thermistor changes to a new value. This change in resistance of thermistor can be converted to a dc voltage change and amplified voltage change can be fed to computer through data acquisition card. Dialog based graphical user interface (GUI) has been developed in visual C++ language for average power measurement in dBm. WR6 standard rectangular waveguide is the input port for the sensor of power meter. Temperature compensation has been achieved. Moderate sensor return loss greater than 20 dB has been found over the frequency range 110 to 170 GHz. The response time of the power sensor is 10 second. Average power accuracy is better than ±0.25 dB within the power range from −10 to 10 dBm at 140 GHz frequency band.

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Direct comparison transfer of microwave power sensor calibrations

Cited by 49 publications

References 6 publications

Direct Comparison Transfer of Microwave Power Sensor Calibration With an Adaptor: Modeling and Evaluation

Direct Comparison Transfer of Microwave Power Sensor Calibration With an Adaptor: Modeling and Evaluation

RF and Microwave Power Standards from 10 MHz to 40 GHz over Decades

Design and Development of Thermistor based Power Meter at 140 GHz Frequency Band

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