Transmission Line Calculator

[ZS6GST]

I am fascinated by the seeming magic attributes of transmission line stubs in their role as matching transformers, impedance repeaters, resonators, gyrators, attenuators, multiplexers, diplexers, reject and band pass filters, phase snifters and last but not least as able conveyors of signals .

As my main interest is in the VHF and UHF bands, coaxial stubs are used when doing simulations using RFSim99 and QUCS while an HP8713 analyzer is used for verification by measurement.
 
The Transmission Line Calculator included with QUCS produces equivalents that embrace the losses and impedance of a defined coaxial stub but it has a limitation as it does not cater for different material for the inner and outer conductors. And there are many coaxial cables that employ different metals for their two conductors .

A search on Google turned up an alternative transmission line calculator by AWR but it suffers from the same single choice limitation for inner and outer conductor material.
 
Does anyone know of a TL calculator that allows different inner and outer conductor material?

73 Pine

[radiolistener]

conductor material doesn't matter, you're just needs to take into account impedance of coaxial cable.

[ZS6GST]

With coax, the resistivity of conductor material has a small but notable effect on loss.

To me this is relevant as I am simulating cavity resonators by using open ended 1/4 wave stubs as equivalent components where mere fractions of change in resistance has a large effect on Q and performance.

73 de Pine, ZS6GST