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The velocity of propagation is c/sqrt(Er) where c is the speed of light and Er is the dielectric constant of the spacer.
Wavelength = Lambda = c/frequency (in free space) wavlength is reduced by sqrt(Er) in a cable
So assuming a dielectric constant of 2.2, the wavelength is
c / (frequency *...
You can download a copy of NEC2 for free from locations on the internet. It will take some time to get it up and running, but it is designed for analyzing wire antennas. NEC4 is also available for purchase.
I suggest you try Champ by Ticra or
Axial by Smtconsultancies
These software packages use a very fast method for the analysis of rotationally symmetric antennas including corrugated horns.
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