I hope I didn't misunderstand you, as I can't see the DC signal path in the probe drawing.
https://www.minicircuits.com/pdfs/BLP-1.9+.pdf
$35 and you are done. Buy 2 and a 3 dB pad to put between them if you need more rejection.
How? The DC path is cut by the capacitor and the RF path is cut by the 13.56/27.12 MHz filters. So what do you expect to see at the oscilloscope?
If not wanting to add a series resistor, I would place a filter capacitor at the BNC side and tune the chokes with individual parallel capacitors to resonate at the said frequencies.
grega_primc
Fvm is correct when he suggests tuning the inductors to resonate at the blocking frequencies with a parallel cap. But it appears you have chosen inductors that have a SRF at these frequencies already, so there is no need to tune. I would put a shunt cap between the two inductors, choose one to have an SRF in between the two inductors. Just a quick look, it seems a ceramic 0603 style cap 100nF should have a SRF close to 20MHz. This would be the most effective use of these parts for a choke. Not as effective if the shunt cap is placed to the left or right of both inductors.
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