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RF coil - RF Cafe Forums
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| Lechko
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Post subject: RF coil
Posted: Wed Jul 13, 2005 8:06 am
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Joined: Wed Jul 13, 2005
8:01 am
Posts: 1 |
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Hi everyone, im new to this group so i hope you
can help me...
I've been working with HFSS for
a while now, designing RF coils for MRI. The structure
is pretty simple - a single turn coil with a coax
feed. the feed is blocked by a copper block on its
port end, and the inner coax connects to the coil...
(coil radius=7cm) the problem is that i keep getting
negative real part for my impedance in low freq.
(around 100MHz).
Happend to any of you? what's
that supposed to mean in HFSS?
thanks in
advance
Alex
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Kirt Blattenberger
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Post subject:
Posted: Tue Jul 19, 2005 7:26 pm
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| Site Admin |
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Joined: Sun Aug 03, 2003
2:02 pm
Posts: 308
Location: Erie, PA
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Greetings Lechko: I am not a HFSS user, but
negative impedances in other simulators often indicate
you are sampling at physical point that is located
at or near a peak in a standing wave on the line.
Constructive interference there can create a voltage
greater than that which is applied. This is an indication
of an impedance mismatch at the sampled frequency.
Or, it could be something else
- Kirt Blattenberger
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Posted 11/12/2012
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