Ok so it’s a thruster that doesn’t use convention fuel. It still uses a “fuel” called electricity that it converts to emit microwave radiation. The radiation is shot down a conical cavity. The “thrust” is speculated to be from the thermal wave from the radiation that is directed out of the cavity.
Don’t know how any of that defies the laws of physics, but it looks like it fits within all the laws.
For people that are supposedly really smart, they are really dumb.
Only it is not shot out of the cavity.
Maybe try to get your comment deleted now that the locus of dumbness has been elucidated?
The microwaves do not come out of the cavity. It is sealed. It does not fit existing understanding of Physics.