2 stage PI type LC filter
Most filter applets assume a linear voltage source or current source. Since the input source of a rectifier is non-linear in this case, these applets are not appropriate.
The rectifier (diodes?) should be included in a simulation. The signal source might best be included as a Thevenin or Norton equivalent circuit. For example:







simulate this circuit &ndash; Schematic created using CircuitLab

 Rsource is not a physical resistor, but is an estimate of the impedance of the signal source. For example, a resonant dipole antenna would make Rsource=70 ohms. An estimate of Rload must be made as well. It might be derived from DC voltage and DC current required.
A simulation must account for the rectifier's non-linear behavior. In SPICE, it must be a transient analysis rather than an AC sweep.