Not sure what do you mean by 180 phase shift … if you place two capacitors in series between two inductors in series you’ll have a 180 degree phase shift … one of the patents of Arie Melis deGeus is based on this and it is overunity with all details written in the patent.
See patent attached and look at last page of schematic, pretty simple to make for your skills
See patent attached and look at last page of schematic, pretty simple to make for your skills