sanders
Member level 3
z parameters
In one model ,i set a lumped port on one side of a microstrip line which was connected to a monopole as a feed line.I set the resistence of the lumped port to be 50ohms and the reactance 0 ohms, after simulation i chected the matrix dada in solution data of "HFSS" option,i chose the Z parameters and i found the Z:lumpport1 value at 8.25GHz is 32.15ohms(magnitude) ,8.65GHz is 50.30ohms.In the simulation ,the sweep range i set is from 7.6 to 9 GHz,i observe the S11 plot and a resonance at 8.25GHz with a minimum s11 value of -8.5dB appears, then i have a doubt :why the resonance is not at 8.65GHz as its Z:lumpport1 value is more close to the preset resistence of the lumped port (50ohms) comparing to 8.25GHz ? S11=20log[(Z:lumpport1-Z0)/(Z:lumpport1+Z0)],is not it?
Any comment and help will be appreciated!Thank you !
Best regards!
In one model ,i set a lumped port on one side of a microstrip line which was connected to a monopole as a feed line.I set the resistence of the lumped port to be 50ohms and the reactance 0 ohms, after simulation i chected the matrix dada in solution data of "HFSS" option,i chose the Z parameters and i found the Z:lumpport1 value at 8.25GHz is 32.15ohms(magnitude) ,8.65GHz is 50.30ohms.In the simulation ,the sweep range i set is from 7.6 to 9 GHz,i observe the S11 plot and a resonance at 8.25GHz with a minimum s11 value of -8.5dB appears, then i have a doubt :why the resonance is not at 8.65GHz as its Z:lumpport1 value is more close to the preset resistence of the lumped port (50ohms) comparing to 8.25GHz ? S11=20log[(Z:lumpport1-Z0)/(Z:lumpport1+Z0)],is not it?
Any comment and help will be appreciated!Thank you !
Best regards!