Series Resonance Real World Example

Does anyone know what 'real world' application or circuit uses Series Resonance as described in:

http://hyperphysics.phy-astr.gsu.edu...serres.html#c2

I am looking for a 50 Ohm system.

Thanks for any insight.

Series LC filters are good at passing one frequency (resonant frequency). The neighboring (series) resistance cannot be too high.

I believe series LC is used in wavetraps, when you are trying to eliminate an interfering radio frequency.

Some types of filters are a combination of both series and parallel LC.

When you choose your L:C ratio, that influences the bandwidth and Q of your filter.

I really do not know what do you want to ask?
LC resistance offen used to design wave trap or launch electromagnetic waves.
So it will be fun if you can describe your application scenario in your circuit design.

If you cut the leads of your 100pF ceramic disc emitter decoupling capacitor to the correct length, the added inductance tunes out the capacitive reactance and the capacitor has a lower impedance over a narrow band.
Frank

Isn't this considered a bandpass filter?



Can a wave trap be simplified to a band pass filter? Isn't 'launching electromagnetic waves' the same as a radiating element? My application: I have a educational project where I am analyzing lumped components using a 50 Ohm power amplifier. I have been successful in making a parallel resonant circuit but I'm baffled on how to make a series resonant circuit.



Cutting the leads would reduce the inductance not increase it. The reduced inductance will increase the SRF. Do you have a topology on how to connect this circuit by any chance?

To make a 100 Ohm Notch filter with a Q=100 use total ESR of 1% of 100 Ohms or 1 Ohm including Source ESR of Cap and Rs of coil.
Q= f/(BW@-3dB)

To use a 50 Ohm Source and have a resonant filter in cable , Select R, choose Qs for Series (lower (X(f)) or Qp for Parallel. higher X(f) and determine C, L and ESR impact.

Series Resonance is preferred for UHF for ease of part selection or for notch filters.
It depends what out-of-band impedance you prefer for band stop or reject. ( high or low impedance), which can affect source, load and DC current.

Thanks for this. Do you happen to have a topology on how I would build this circuit?

It depends how you arrange the LC series (or LC tank), and where you tap for output.

Because I like to watch simulations run...

Here is an illustration of bandstop (or notch) versus bandpass:

Notice how the L:C ratio makes a big difference in the rolloff curve.

Notice these LC series are not so different from an LC tank circuit, except there is greater resistance in the current loop, which reduces Q.

It is common to use an LC tank to do these filter functions, by re-arranging components.