Right. I'm nowhere near an expert in this but I would guess that the receiver has to be orthogonal to the planar field lines (parallel to the rectangular transmitter). Mostly that's a guess though because I'm not sure I understand how the magnetic resonance works, however he does seem careful to place the devices in that alignment.
Resonant energy transfer has been known for a very long time. Any electrical system that has inductance or capacitance (which means all electrical systems) will have a resonance point. This resonance point is the like the resonance point of a mass spring system or like resonance of a pendulum in a grandfather clock. If you drive a system at its resonance point, you will maximize the energy transfer into the system. That is all that is going on. If both the send and receive coils resonate at the same frequency, maximum power transfer can occur. There is no magic. This isn't a technology.
Also, the coils do indeed have to be parallel to each other. Fields gradients are function as vectors in space and the receive coil must be positioned to "capture" as many field lines as possible emitted from the transmitter.
OK, thanks. That's what it sounded like but his description was low on the details so I figured I wouldn't make that stretch. Anyway, yes, my guess was mostly based on Maxwell and a little vector calc (physics minor, nothing more) but it seemed to make sense.
