Microwave attenuation standards

Warner, F.L.

doi:10.1049/ep.1981.0190

Cited by 4 publications

(8 citation statements)

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“…The direct, differential or null and built-up measurement techniques have already been established in such laboratories to provide the RF calibrations in the designated frequency range. The detail operation, advantages and limitations of using these techniques are well studied and upgraded in [6,7,16] and [17,18]. The working or transfer standards for RF power parameter are generally thermistor mount, bolometers, RF transfer standards while the measuring equipment are power meter along with sensor and spectrum analyzer, etc.…”

Section: Importance Of Mismatch Uncertainty For Calibration Laboratoriesmentioning

confidence: 99%

“…In general power measurement system, for the calibration of power sensor or RF transfer standard connected to the compatible power meter, the calibration factor is defined as [11,17,24],…”

Section: Uncertainty Limits In Voltage(mentioning

confidence: 99%

“…The mismatch uncertainty is type B uncertainty and having a U -shaped distribution due to a cosine function [7,17]. This means that the uncertainty of the mismatch is more likely to occur near the limits than in the center.…”

Section: Uncertainty Limits In Voltage(mentioning

confidence: 99%

“…Since the reflection coefficients are complex quantities composed of magnitude and phase components, the Gamma correction requires the full vector data to get the actual calibration factor K in equation (7) [7,17],…”

Section: Uncertainty Limits In Voltage(mentioning

confidence: 99%

“…This is because of the mismatch errors referring to the source and load sides of the measurement system. Normally instead of the attenuation, one measures the insertion loss using such system as given below [7,17,21],…”

Section: Expressions For the Mismatch Uncertainty When Measuring Micrmentioning

confidence: 99%

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Importance and estimation of mismatch uncertainty for RF parameters in calibration laboratories

Patel

Negi

2012

Int. J. Metrol. Qual. Eng.

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Abstract.A number of calibration techniques are used in Radio Frequency (RF) calibration for power, attenuation and impedance parameters. Mismatch uncertainty plays a major role in these measurements and in estimation of combined uncertainty according to ISO/IEC 17025:2005 and GUM document. Formulas to evaluate the mismatch uncertainty in terms of reflection coefficient, voltage standing wave ratio and scattering parameters have been evaluated earlier and are being used in RF calibration. The present paper summarizes the mismatch formulas previously studied and the modified ones suitable to the measurement system and techniques available today. For power and attenuation calibration in the particular frequency range, an establishment of traceability for one-port measurement in the same frequency range is required. The methods to reduce and control this uncertainty component and their limitations are also discussed for best measurements practices in the calibration laboratories.

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Section: Importance Of Mismatch Uncertainty For Calibration Laboratoriesmentioning

confidence: 99%

“…In general power measurement system, for the calibration of power sensor or RF transfer standard connected to the compatible power meter, the calibration factor is defined as [11,17,24],…”

Section: Uncertainty Limits In Voltage(mentioning

confidence: 99%

Section: Uncertainty Limits In Voltage(mentioning

confidence: 99%

Section: Uncertainty Limits In Voltage(mentioning

confidence: 99%

Section: Expressions For the Mismatch Uncertainty When Measuring Micrmentioning

confidence: 99%

See 3 more Smart Citations