how to get CPW's reactive impedance?

[jianqiuzuo]

Hi guys,

I have a question soliciting your answer.

I am designing a coplanar waveguide to match the 50 ohm from microwave source. Hence the slot width, thickness etc factors have to be considered to ensure the 50ohm. According to the maximum power transfer theorem, the two impedances should be conjugate. The difficulty lies in the TXline only gives out the resistance instead of reactance when I design my substrate. I don't know why they do that?

The imaginary part is negligible? or the lossless CPW be assumed? or it's Achilles heel of the software?

And why generally microwave source only tell us the impedacne in resistance format?

Many thanks due to you

JQ

 

[nader1388]

in design of antenna we attempt to decrease VSWR or return loss and determinate
the component of Z-matrix is not very important albeit it is better we decrease the reactance of antenna .