Hi,
I am using the s2rlgc function to calculate attenuation and phase constants across a frequency range from a .s2p file I measured on a 50-ft coaxial cable from 2 to 30 MHz with a calibrated Network Analyzers . When I then apply the calculated attenuation and phase constants to determine s-parameters of a cable of a longer length, such as 142-ft, in the plots below I get a sign inversion on the s21 imaginary component around 9 and 28 MHz, as well as, a slope inversion on the s21 real component at the same frequencies. Which then cause a jump on the smith chart below.
Is this a known issue for s2rlgc? Or, does anyone have an explanation as to why this is occuring? Or, a way to fix it? Is the length of cable measured the issue? Should a shorter cable be measured?
Thanks for any help!Hi,
I am using the s2rlgc function to calculate attenuation and phase constants across a frequency range from a .s2p file I measured on a 50-ft coaxial cable from 2 to 30 MHz with a calibrated Network Analyzers . When I then apply the calculated attenuation and phase constants to determine s-parameters of a cable of a longer length, such as 142-ft, in the plots below I get a sign inversion on the s21 imaginary component around 9 and 28 MHz, as well as, a slope inversion on the s21 real component at the same frequencies. Which then cause a jump on the smith chart below.
Is this a known issue for s2rlgc? Or, does anyone have an explanation as to why this is occuring? Or, a way to fix it? Is the length of cable measured the issue? Should a shorter cable be measured?
Thanks for any help! Hi,
I am using the s2rlgc function to calculate attenuation and phase constants across a frequency range from a .s2p file I measured on a 50-ft coaxial cable from 2 to 30 MHz with a calibrated Network Analyzers . When I then apply the calculated attenuation and phase constants to determine s-parameters of a cable of a longer length, such as 142-ft, in the plots below I get a sign inversion on the s21 imaginary component around 9 and 28 MHz, as well as, a slope inversion on the s21 real component at the same frequencies. Which then cause a jump on the smith chart below.
Is this a known issue for s2rlgc? Or, does anyone have an explanation as to why this is occuring? Or, a way to fix it? Is the length of cable measured the issue? Should a shorter cable be measured?
Thanks for any help! s2rlgc, sign inversion MATLAB Answers — New Questions

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