Can you produce max waves, adding them, creating massive spikes like it showed in this video with water, but with multi antennas. Can you do this with electromagnetic wave in air with some complex mathematics, if you can, how can you measure it? I am only interested, if you can create massive wave, spike shown in minute 2:50-3:10 and if you can capture it? Can you create this massive "spike" anywhere in space? Is this even possible, does anyone know if someone already done this?
Electronic – “Drawing” signals with antenna
antennaelectromagneticwave
Related Solutions
In AM modulation how is an electrical signal mixed with the carrier wave?
For AM the usual way is to use analogue multiplication i.e. the two signals are fed to a multiplier. The output consists of sum and difference signals i.e. you get sidebands. There is no longer any baseband (well there is no intention but a little will leak through): -
Picture taken from here
You get sum and difference frequencies because that is what happens when you multiply sin a with sin b: -
Dielectric wall reflects waves. Reflection is complex because every time the wave meets a border of medium it gets partially reflected. Depending on wavelength, plate thicknesses, their materials and placements it's well possible that the radiation to one direction is stronger than to the other direction. The radiation is strongest to the direction where most of the waves (incident, reflected, reflected multiple times) travel with least phase cancellation.
Best Answer
The idea you are referring to is know as beam forming. Some high end WiFi routers have been using it for several years now. The idea is by transmitting the same signal from multiple antennas (usually 4) and imposing different delays on 3 of them the signal forms paths of interference. Some being destructive and some being constructive. By pointing a channel of constructive interference in the direction of a client (a laptop for example) the signal strength is boosted in that direction.