Several mysteries with this patent:
1. Why does Barbat not put his "sending coil" co-axially inside a magnifying coil made of copper tubing with a treated inside surface (photoconductive) such that all of the photonic induction can impinge on the inside surface of the magnifying coil tube.
A co-axial approach such as this would minimize radiated losses. Alternately a long copper pipe with inside surface treated and co-axial with a wire running from end to end as the sending coil. With suitably spaced insulating washers or beads, this assembly could be wound into a coil and put into a pot core to completely contain stray fields.
Ion,
the sending coil can not be coaxial with the magnifying coil because the electrokinetic effect of the photons hitting the magnifying coil generates a current which is in the
same direction as the current in the sending coil.
Trying to use the self-inductance effect of co-axial coils would generate a current which is in the
opposite direction, thereby cancelleing the desired gain.
Barbat's design and placement of coils is already optimised as much as possible, even if it looks "crude" at first sight.
The only coils that can benefit from co-axial placement are the maginfying coil and the output coil, and their currents are in opposition. Here, close coupling is a benefit. See the arrows in the drawings. See paragraph 0137 in the patent.
This patent is exemplary in all its facets, and deserves study. I printed it so I could underline / highlight the important parts, and there a re LOTS of them.

Barbat is obviously onto something big. It's like a new branch of physics !

Here are just a few paragraphs of importance: 57, 90, end of 152.
In my opinion, this is the most promising new energy device that doesn't use the aether as its main power source. It rather looks "conventional", much like photocells or photodetectors.
The only info missing in the patent is what is the physical size required for a given output, at what fraquency does this works best (very high, I assume), and how to easily make a satisfactory coating (at home) with semiconductors.
I have been wanting to duplicate this for the last year and a half, what's holding me ?
Altair