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Old November 18th 07, 07:12 PM posted to rec.radio.amateur.antenna
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Default Resontate frequency of parallel L/C

Brian Howie wrote:


|
|
!
-----!-----
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L C
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R R
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------------
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I ran it through Spice ( laziness) - It doesn't resonate. Intuitively
you think it should have a low Q resonance at 1.6MHz , but it doesn't
Nice one.

73 Brian GM4DIJ



The trick is to make

R = sqrt(L/C)

then the impedance is real everywhere. You can use any old values for L:
and C, as long as you make R=sqrt(L/C);


That equation is obviously know from transmission lines too..
 
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