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Genesys does coax filters, but not high pass. You will have a problme with these because they require gaps between sections of the center conductor. This causes some physical design problems. You could do a band pass.
The traditional meaning of coaxial filter is a coaxial transmission line with the center conductor having different diameters at different locations. This was invented around 1943. A mcirostrip version using the same theory has lengths of lines of different widths (impeances) in tandem.
The Nuhertz program does transmission line filters which uses lengths of lines connected together in different ways. These can be any form of line including coaxial cables. I use an older version of this program and prefer it to all others for passive filters.
Filter Wiz Pro is the best active filter program I have found.
I'm involved in a study of squared and rectangular coaxial components.
Can anyone give me a reference about it?
I'm implementing the above structures by CST but I'ld need
some design formulas...
Can anyone help me?
Thanks in advance
Microstrip (slotted) antennas, Phased arrays, microstrip and stripline components