【文章內(nèi)容簡介】 n by deembedding the% effect of the TRL test fixture from the DUT measurements using the measurements% peformed on the TRL calibration standards. % % The function uses the following input parameters:%% Sthru Four colom matrix containing SParameters of the thru measurement on% TRL test fixture.% Sopen Four colom matrix containing SParameters of the open measurement on% TRL test fixture. Only S11 and S22 is of interest here and the S21 and% S12 data which will be in the noise floor of the VNA will be discarded.% Sline Four colom matrix containing SParameters of the line measurement on% TRL test fixture.% Sdut Four colom matrix containing SParameters of the DUT inserted into the% TRL test fixture.% f Frequencies at which SParameters were measured in Hz.%% The coloms of the SParameter matrix represent [S11 S21 S12 S22].%% format: [Sx,GL]=trl(Sthru,Sopen,Sline,Sdut,freq)%% The output consists of the deembedded device SParameters (Sx), and the propagation % constant (GL) of the line standard used in the TRL calibration. The propagation constant% can be used to calculate the characteristic impedance of the microstrip calibration % line. Since microstrip is a dispersive transmission line, the characteristic impedance% will vary as a function of frequency. The measured SParameters will be normalised with% respect to the actual characteristic impedance of the transmission line calibration% standard. By extracting this impedance, the SParameter data can be renormalised to % 50 Ohm. %% See for some post processing functions that can be performed.%% Writer : C. van Niekerk% Version : % Date : 07/06/1995 % This program is based on the work in the presented in the following paper:%% [1] . Engen, . Hoer, ThruReflectLine: An Improved Technique for% Calibrating the Dual SixPort Automatic Network Analyser,% IEEE Trans. MTT, Vol. 27,No. 12, December 1979, pp. 987998 % Define the imaginary constant i=sqrt(1)。 % Convert the measured sparameters of the DEVICE to one variable S11d = Sdut(:,1)。S21d = Sdut(:,2)。S12d = Sdut(:,3)。S22d = Sdut(:,4)。 % Convert the measured sparameters of the REFLECT standerd to one variable S11r = Sopen(:,1)。S22r = Sopen(:,4)。 % Convert the measured sparameters of the THRU standerd to one variable S11t = Sthru(:,1)。S21t = Sthru(:,2)。S12t = Sthru(:,3)。S22t = Sthru(:,4)。 % Convert the measured sparameters of t