Re: NEC-LIST: Twin wire impedance calculations

Good Morning,

While we are one the topic of twin wires with square cross section, I
would like to add a question to that of Callum. I also couldn't find the
equations mentioned, but I did use the relation of 1.18 mentioned last
week. We are, however, currently developing an antenna with a square
twin wire above a ground plane. (The antenna is an LPMA). We are
basically working with trial and error to find a reliable impendance for
the ground plane twin wire, but I would just like to know if there are
any references to this type of feed structure? We do have an answer (in
terms of dimensions) but I prefer having a mathematical motivation why I
did what I did.

Best Regards,
David

Antenna Development Engineer
Grintek Antennas
South Africa

>>> Callum Heinrich <callum.heinrich_at_student.adelaide.edu.au> 05/14/03
06:27AM >>>
Dear all,

I know this may be a little outiside the scope of this mailing list,
but I am
just enquiring if anyone out there knows of where I might be able to
find
equations for determining the characteristic impedance of a twin wire
transmission line, where the wires are of a square cross-section, not
circular.

Regards

Callum Heinrich.

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