Wes Stewart wrote:
wrote:
|I will argue about any software package that doesn't agree with reality.
So "reality" exists when the software gives you the answer you expect:
Come on, Wes. Reality exists when the software *accurately* models inductance,
capacitance, and resistance. Software packages that assume zero distributed
capacitance in a real-world coil are simply inaccurate for certain applications.
For instance, Kraus' phase-reversing coil cannot be modeled in EZNEC, at least
not as a single coil in a straight forward manner. Do you have any suggestions
about using EZNEC (or other MOM software) to model the phased array antenna
described by Kraus on page 824 of _Antennas_for_all_Applications, 3rd edition,
which uses two phase-reversing coils?
So the question still stands. Can you model Kraus' phase-reversing coil using
the method of moments? If so, and the coil is not perfectly tuned and perfectly
installed, you will have current flowing into both ends of the coil at the same
time. I am not a MOM expert, so I don't know the answer. EZNEC seems to model
phase-reversing stubs just fine.
You trust it to analyze linear conductors
and inductive stubs that have inductance and capacitance per unit
length but conclude that it is flawed when the conductor is coiled up
a bit. Interesting.
EZNEC seems to model inductive stubs just fine so I have no reason to
distrust it. EZNEC fails to give the same results for an inductive stub
Vs a lumped inductive reactance because it doesn't model real-world
coils. It will not model Kraus' phase-reversing coil and gives erroneous
results when an antenna using phase-reversing coils is modeled. I have
the EZNEC files that demonstrate that fact if you would like to have them.
Did you bother to read Rhea's paper?
http://www.eagleware.com/pdf/apps/20...ngSolenoid.pdf
This is the first I have heard of it. I will read it this afternoon
at work. I can't download .pdf files at home.
--
73, Cecil
http://www.qsl.net/w5dxp
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