RLCA Resonant Converter Output: Is Sinewave Always Bipolar or Can It Be Unipolar?

In an RLCA resonant converter, will the sine output always be bipolar, centered vertically around 0V, regardless of whether the square wave is bipolar or unipolar?

Or, if the square wave is unipolar (positive only) will the sinewave also be unipolar (positive only), having a unipolar voltage amplitude?

The duty cycle and peak values thus average DC value is passed thru in this resonant Low Pass Filter (LPF).

In the circuit as you have drawn it, where V1 is a square wave that alternates between 0V and some positive voltage, the filtered output will be bipolar -- both positive and negative.

However, it will not be centered on 0V. The average DC value is mostly unchanged by the filter (aside from I*R drop). But the sine wave's magnitude is larger than the square wave's magnitude, so it swings both positive and negative. The negative swings are smaller than the positive swings.

So the answer to your question is: "Neither of the above."