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Resonant frequency chart

时间:04-09 整理:3721RD 点击:
Is there a chart that provides the resonant frequency for a filter using L's and C's at 2.4GHz?

If so can some one share the link with me. Also I probably will need help learning how to use it.

Ur question is not clear...

Do u want to know the combination of L's and C's for a filter at 2.4 G...?

yes that is what I am asking for.

Are you really seriously considering a filter with discrete passive components @ 2.4 GHz? Strongly advice to use some transmission line based filter structures at those frequencies, like microstrip filters.

I just used 2.4GHz as an example, (a bad example) - you cant hide ignorance. I am just inquiring about a chart that tells you the combination of L's and C's for a filter at a specific frequency. If not 2.4Ghz then lets say 60Mhz or whatever frequency makes sense. Karote you said that discrete passives are not good for 2.4Ghz but you never explained why, I would like to know why you said what you said for learning purposes.

Lumped filter at 2.4GHz can be done but is tricky. Fringe
efects of the L or C package can produce weird results,
making unuseful. The smaller lumped element package
is the 0402, no sure. This will have a completely different
value as soon is located in the board.

Lumped L's are not good for higher frequencies... Why?

The reactance of an 'L' increases with frequency... XL=L*omega
But as frequency increases, the capacitance between two turns of the inductor oil, begins to dominate the impedance, thus resulting in a decrease in effective impedance! This is due to what is called as the self-resonance of the inductor... Various models of the inductor is to be analyzed for use at high frequencies.

Also if you want to know a chart, you can generate one on MATLAB. You know the formula to compute resonant frequency. Run a loop for L=1nH to 1H, and compute corresponding Cs. Plot them to obtain a chart... Easier done than said...!

Regards,

Sidharth. B

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