Attenuation and ratio—National standards

Bayer, H; Warner, F.L.; Yell, R.W.

doi:10.1109/proc.1986.13400

Cited by 17 publications

(3 citation statements)

References 39 publications

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“…So, instead of performing the accurate measurements to have imprecise knowledge of this system used, adding a further term to uncertainty budget as mismatch uncertainty is recommended. Formulas for estimating mismatch uncertainty are derived in terms of reflection coefficients, VSWRs and S-parameters and evaluated earlier in [19][20][21][22][23]. These formulas were developed in accordance to the measurement parameter, its measuring system and the system for measuring the components of formulas.…”

Section: Importance Of Mismatch Uncertainty For Calibration Laboratoriesmentioning

confidence: 99%

“…The difference between the measured insertion loss and attenuation is termed as the mismatch error and is defined in terms of complex independent variables as [6,8,19],…”

Section: For Flat Attenuation Ie Fixed Attenuatormentioning

confidence: 99%

“…Total uncertainty contribution for attenuation MA T due to mismatch error for two-port component i.e. for fixed attenuator can be derived from equation (19), when only magnitude is known (linear), applicable in case of low attenuation values (<10 dB) [17,19,21].…”

Section: For Flat Attenuation Ie Fixed Attenuatormentioning

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%

“…The difference between the measured insertion loss and attenuation is termed as the mismatch error and is defined in terms of complex independent variables as [6,8,19],…”

Section: For Flat Attenuation Ie Fixed Attenuatormentioning

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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Attenuation Measurement

Hilty

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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Attenuation Measurement

Hilty¹

2005

Encyclopedia of RF and Microwave Engineering

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When a signal is sent along any transmission path, many different mechanisms degrade it. Because of finite conductivity, every cable shows a resistive loss. Scattering loss is dominated by Rayleigh scattering, and below 1600nm absorption losses are caused mainly by OH absorption. Wireless transmission paths, such as microwave links, satellite links, and broadcast or mobile communication, are affected by scattering caused by rain, clouds, and multiple reflections. Many different methods and a variety of systems for measuring attenuation have been developed.

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Attenuation and ratio—National standards

Cited by 17 publications

References 39 publications

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

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

Attenuation Measurement

Attenuation Measurement

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