padoh
Junior Member level 2
Consider two structures in cascade
I wil name the combined structure as C.
I have the s-parameters for the structure A and for the overall structure C. I want to extract the s-param for the structure B. i need to use matlab for the purpose.
The technique i have chosen is to convert S-param to transmission param (or ABCD param), since for a cascaded structure like above the ABCD parameters would be
[Tc]=[Ta][Tb]
where Tc=transmission param for combined structure
Ta=transmission param for structure A
Tb=transmission param for structure B
to find Tb i can do the following computations:
[Tc][Ta]-1=[Tb]
So in the maTLAB code attached below, i have taken the s2p (sparam file) for structure A, converetd it to t param( infact the ABCD param), then taken the s2p file for C and multiplied both matrices. the end result is converted back to s-param file, since i want my answer in s-param. Please note that the matrices used here are 3D matrices.
i have written the code but the answers are wrong. there are no errors. but the answers are not matching with the s-param i have for structure B. Can neone plz help?
it doesnt matter if the code is slow etc. All i want is the correct ans.
file = 'C:\Users\abc\A.s2p';
h = read(rfdata.data,file); % Read s-param file containing the s-param for structure A into data object.
[outmatrix, freq] = extract(h,'S',50); %extracting s-param from the file
abcd_params_h = s2t(outmatrix); %converting to ABCD param
a=abcd_params_h
for j=1:127
bi=inv(a
,:,j));
eval(['A' num2str(j) '=bi']);
end
%where A1, A2 etc are the inverse of transmission param for the test structure and have to be multiplied with the transmission param for total structure
% c=cat (3,A1,A2,A3,A4,A5);
file2 = 'C:\Users\abc\C.s2p';
h1 = read(rfdata.data,file2); % Read s-param file containing the s-param for structure C into data object
[outmatrix1, freq] = extract(h1,'S',50); %extracting s-param from the file
abcd_params_h1 = s2t(outmatrix1); %converting
b=abcd_params_h1;
for j=1:127
bi=(b,:,j));
eval(['B' num2str(j) '=bi']);
end
%where B1, B2 etc are the transmission param for the total structure and
%have to be multiplied with the inverse transmission param generated above using
%outmatrix
% c=cat (3,B1,B2,B3,B4,B5)
C1=A1*B1
C2=A2*B2
C3=A3*B3
C4=A4*B4
C5=A5*B5
C6=A6*B6
C7=A7*B7
C8=A8*B8
C9=A9*B9
C10=A10*B10
C11=A11*B11
C12=A12*B12
C13=A13*B13
C14=A14*B14
C15=A15*B15
C16=A16*B16
C17=A17*B17
C18=A18*B18
C19=A19*B19
C20=A20*B20
C21=A21*B21
C22=A22*B22
C23=A23*B23
C24=A24*B24
C25=A25*B25
C26=A26*B26
C27=A27*B27
C28=A28*B28
C29=A29*B29
C30=A30*B30
C31=A31*B31
C32=A32*B32
C33=A33*B33
C34=A34*B34
C35=A35*B35
C36=A36*B36
C37=A37*B37
C38=A38*B38
C39=A39*B39
C40=A40*B40
C41=A41*B41
C42=A42*B42
C43=A43*B43
C44=A44*B44
C45=A45*B45
C46=A46*B46
C47=A47*B47
C48=A48*B48
C49=A49*B49
C50=A50*B50
C51=A51*B51
C52=A52*B52
C53=A53*B53
C54=A54*B54
C55=A55*B55
C56=A56*B56
C57=A57*B57
C58=A58*B58
C59=A59*B59
C60=A60*B60
C61=A61*B61
C62=A62*B62
C63=A63*B63
C64=A64*B64
C65=A65*B65
C66=A66*B66
C67=A67*B67
C68=A68*B68
C69=A69*B69
C70=A70*B70
C71=A71*B71
C72=A72*B72
C73=A73*B73
C74=A74*B74
C75=A75*B75
C76=A76*B76
C77=A77*B77
C78=A78*B78
C79=A79*B79
C80=A80*B80
C81=A81*B81
C82=A82*B82
C83=A83*B83
C84=A84*B84
C85=A85*B85
C86=A86*B86
C87=A87*B87
C88=A88*B88
C89=A89*B89
C90=A90*B90
C91=A91*B91
C92=A92*B92
C93=A93*B93
C94=A94*B94
C95=A95*B95
C96=A96*B96
C97=A97*B97
C98=A98*B98
C99=A99*B99
C100=A100*B100
C101=A101*B101
C102=A102*B102
C103=A103*B103
C104=A104*B104
C105=A105*B105
C106=A106*B106
C107=A107*B107
C108=A108*B108
C109=A109*B109
C110=A110*B110
C111=A111*B111
C112=A112*B112
C113=A113*B113
C114=A114*B114
C115=A115*B115
C116=A116*B116
C117=A117*B117
C118=A118*B118
C119=A119*B119
C120=A120*B120
C121=A121*B121
C122=A122*B122
C123=A123*B123
C124=A124*B124
C125=A125*B125
C126=A126*B126
C127=A127*B127
outmatrix2=cat (3,C1,C2,C3,C4,C5,C6,C7,C8,C9,C10,C11,C12,C13,C14,C15,C16,C17,C18,C19,C20,C21,C22,C23,C24,C25,C26,C27,C28,C29,C30,C31,C32,C33,C34,C35,C36,C37,C38,C39,C40,C41,C42,C43,C44,C45,C46,C47,C48,C49,C50,C51,C52,C53,C54,C55,C56,C57,C58,C59,C60,C61,C62,C63,C64,C65,C66,C67,C68,C69,C70,C71,C72,C73,C74,C75,C76,C77,C78,C79,C80,C81,C82,C83,C84,C85,C86,C87,C88,C89,C90,C91,C92,C93,C94,C95,C96,C97,C98,C99,C100,C101,C102,C103,C104,C105,C106,C107,C108,C109,C110,C111,C112,C113,C114,C115,C116,C117,C118,C119,C120,C121,C122,C123,C124,C125,C126,C127)
%now we have obtained the transmission parameters for B structure only
%and we have to convert it to s-param and get the s2p file from which we
%can plot curve etc
s_params_h2 = t2s(outmatrix2); %converting
txdata = rfdata.data;
txdata.S_Parameters = outmatrix2;
txdata.Freq=freq
write(txdata,'C:\Users\abc\B.s2p')
- - - Updated - - -
somebody plz help
I wil name the combined structure as C.
I have the s-parameters for the structure A and for the overall structure C. I want to extract the s-param for the structure B. i need to use matlab for the purpose.
The technique i have chosen is to convert S-param to transmission param (or ABCD param), since for a cascaded structure like above the ABCD parameters would be
[Tc]=[Ta][Tb]
where Tc=transmission param for combined structure
Ta=transmission param for structure A
Tb=transmission param for structure B
to find Tb i can do the following computations:
[Tc][Ta]-1=[Tb]
So in the maTLAB code attached below, i have taken the s2p (sparam file) for structure A, converetd it to t param( infact the ABCD param), then taken the s2p file for C and multiplied both matrices. the end result is converted back to s-param file, since i want my answer in s-param. Please note that the matrices used here are 3D matrices.
i have written the code but the answers are wrong. there are no errors. but the answers are not matching with the s-param i have for structure B. Can neone plz help?
it doesnt matter if the code is slow etc. All i want is the correct ans.
file = 'C:\Users\abc\A.s2p';
h = read(rfdata.data,file); % Read s-param file containing the s-param for structure A into data object.
[outmatrix, freq] = extract(h,'S',50); %extracting s-param from the file
abcd_params_h = s2t(outmatrix); %converting to ABCD param
a=abcd_params_h
for j=1:127
bi=inv(a
,:,j));eval(['A' num2str(j) '=bi']);
end
%where A1, A2 etc are the inverse of transmission param for the test structure and have to be multiplied with the transmission param for total structure
% c=cat (3,A1,A2,A3,A4,A5);
file2 = 'C:\Users\abc\C.s2p';
h1 = read(rfdata.data,file2); % Read s-param file containing the s-param for structure C into data object
[outmatrix1, freq] = extract(h1,'S',50); %extracting s-param from the file
abcd_params_h1 = s2t(outmatrix1); %converting
b=abcd_params_h1;
for j=1:127
bi=(b
,:,j));eval(['B' num2str(j) '=bi']);
end
%where B1, B2 etc are the transmission param for the total structure and
%have to be multiplied with the inverse transmission param generated above using
%outmatrix
% c=cat (3,B1,B2,B3,B4,B5)
C1=A1*B1
C2=A2*B2
C3=A3*B3
C4=A4*B4
C5=A5*B5
C6=A6*B6
C7=A7*B7
C8=A8*B8
C9=A9*B9
C10=A10*B10
C11=A11*B11
C12=A12*B12
C13=A13*B13
C14=A14*B14
C15=A15*B15
C16=A16*B16
C17=A17*B17
C18=A18*B18
C19=A19*B19
C20=A20*B20
C21=A21*B21
C22=A22*B22
C23=A23*B23
C24=A24*B24
C25=A25*B25
C26=A26*B26
C27=A27*B27
C28=A28*B28
C29=A29*B29
C30=A30*B30
C31=A31*B31
C32=A32*B32
C33=A33*B33
C34=A34*B34
C35=A35*B35
C36=A36*B36
C37=A37*B37
C38=A38*B38
C39=A39*B39
C40=A40*B40
C41=A41*B41
C42=A42*B42
C43=A43*B43
C44=A44*B44
C45=A45*B45
C46=A46*B46
C47=A47*B47
C48=A48*B48
C49=A49*B49
C50=A50*B50
C51=A51*B51
C52=A52*B52
C53=A53*B53
C54=A54*B54
C55=A55*B55
C56=A56*B56
C57=A57*B57
C58=A58*B58
C59=A59*B59
C60=A60*B60
C61=A61*B61
C62=A62*B62
C63=A63*B63
C64=A64*B64
C65=A65*B65
C66=A66*B66
C67=A67*B67
C68=A68*B68
C69=A69*B69
C70=A70*B70
C71=A71*B71
C72=A72*B72
C73=A73*B73
C74=A74*B74
C75=A75*B75
C76=A76*B76
C77=A77*B77
C78=A78*B78
C79=A79*B79
C80=A80*B80
C81=A81*B81
C82=A82*B82
C83=A83*B83
C84=A84*B84
C85=A85*B85
C86=A86*B86
C87=A87*B87
C88=A88*B88
C89=A89*B89
C90=A90*B90
C91=A91*B91
C92=A92*B92
C93=A93*B93
C94=A94*B94
C95=A95*B95
C96=A96*B96
C97=A97*B97
C98=A98*B98
C99=A99*B99
C100=A100*B100
C101=A101*B101
C102=A102*B102
C103=A103*B103
C104=A104*B104
C105=A105*B105
C106=A106*B106
C107=A107*B107
C108=A108*B108
C109=A109*B109
C110=A110*B110
C111=A111*B111
C112=A112*B112
C113=A113*B113
C114=A114*B114
C115=A115*B115
C116=A116*B116
C117=A117*B117
C118=A118*B118
C119=A119*B119
C120=A120*B120
C121=A121*B121
C122=A122*B122
C123=A123*B123
C124=A124*B124
C125=A125*B125
C126=A126*B126
C127=A127*B127
outmatrix2=cat (3,C1,C2,C3,C4,C5,C6,C7,C8,C9,C10,C11,C12,C13,C14,C15,C16,C17,C18,C19,C20,C21,C22,C23,C24,C25,C26,C27,C28,C29,C30,C31,C32,C33,C34,C35,C36,C37,C38,C39,C40,C41,C42,C43,C44,C45,C46,C47,C48,C49,C50,C51,C52,C53,C54,C55,C56,C57,C58,C59,C60,C61,C62,C63,C64,C65,C66,C67,C68,C69,C70,C71,C72,C73,C74,C75,C76,C77,C78,C79,C80,C81,C82,C83,C84,C85,C86,C87,C88,C89,C90,C91,C92,C93,C94,C95,C96,C97,C98,C99,C100,C101,C102,C103,C104,C105,C106,C107,C108,C109,C110,C111,C112,C113,C114,C115,C116,C117,C118,C119,C120,C121,C122,C123,C124,C125,C126,C127)
%now we have obtained the transmission parameters for B structure only
%and we have to convert it to s-param and get the s2p file from which we
%can plot curve etc
s_params_h2 = t2s(outmatrix2); %converting
txdata = rfdata.data;
txdata.S_Parameters = outmatrix2;
txdata.Freq=freq
write(txdata,'C:\Users\abc\B.s2p')
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somebody plz help