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Complex S-parameter measurement and its uncertainty evaluation on a vector network analyzer

机译：矢量网络分析仪的复杂S参数测量及其不确定度评估

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摘要

The present paper deals with an uncertainty evaluation in complex scattering (S)-parameter measurements and the correlation coefficients between the real and imaginary components of S-parameters in the frequency range 2-18 GHz. The measurements were performed for one-port and two-port components using a vector network analyzer (VNA) and the uncertainty estimation for complex transmission and reflection coefficients were done separately. The various contributors to the measurement uncertainty in real and imaginary component of S-parameter have been evaluated as per the European cooperation for Accreditation (EA) Guidelines on VNAs. Uncertainty budgets have been provided for one/two-port components separately with various sources of uncertainties involved and their distribution. This paper reports the combined standard uncertainty within +-0.005 and +-0.015 in complex transmission and reflection coefficients, respectively, upto 18 GHz. The correlation coefficients (+1.0 to -1.0) between the real and imaginary components of S-parameters are calculated for a coaxial mismatch of voltage standing wave ratio (VSWR) approx=3.0 and a coaxial attenuator (3 dB) in Type-N connectors.
机译：本文研究了复数散射（S）参数测量中的不确定性评估以及2-18 GHz频率范围内S参数的实部和虚部之间的相关系数。使用矢量网络分析仪（VNA）对一个端口和两个端口的组件进行测量，并分别进行复杂传输和反射系数的不确定性估计。根据欧洲VNA认可合作（EA）指南，评估了S参数实部和虚部中测量不确定度的各种因素。已经为一/二端口组件分别提供了不确定性预算，其中涉及各种不确定性来源及其分布。本文报告了在高达18 GHz的复杂传输和反射系数下，组合标准不确定度分别在+ -0.005和+ -0.015之间。针对N型连接器中电压驻波比（VSWR）大约= 3.0的同轴不匹配和同轴衰减器（3 dB）的情况，计算S参数的实部和虚部之间的相关系数（+1.0至-1.0） 。

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