On 11/21/21 11:11 AM, Michael Tope wrote:
Hi Jim,
Starting with version 5.0, EZNEC implements the capability to model
lumped transformers, inductors, capacitors, and resistors. Thus, it
should have capability to model the Collins 90deg hybrid. The only
caveat is that the transformer model is ideal (K=1.0), so including
the impact of flux leakage and core loss would have to be captured
with additional components in an equivalent circuit model.
I wonder how they do it. An ideal transformer has no Z or Y matrix - for
an ideal transformer you can't express the voltage in terms of current
or vice versa. And yet, various analyses do use transformers and
admittance matrices.
I1 = Y11 V1 + Y12 V2
I2 = Y21 V1 + Y22 V2
You can't find Ys from I1 = I2 / N and V1 = V2 * N.
Lumped L R and C is easy.
Maybe an extension to the underlying NEC core? But NEC is all about
creating a big Y matrix, and then solving it.
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