Witric Power - Witricity Explained

The size of the components is dictated by:

* distance from transmitter to receiver
* the wavelength of the radiation
* the laws of physics, specifically the Rayleigh Criterion or Diffraction limit, used in standard RF (Radio Frequency) antenna design, which also applies to lasers. These laws dictate that any beam will spread (microwave or laser) and become weaker and more diffuse over greater distance. The larger the transmitter antenna or laser aperture, the tighter the beam and the less it will spread as a function of distance (and vice versa). Smaller antennas also suffer from excessive losses due to sidelobes.

Then the power levels are calculated by combining the above parameters together, and adding in the gains and losses due to the antenna characteristics and the transparency of the medium through which the radiation passes. That process is known as calculating a Link Budget.

Technorati Tags: antenna design diffraction limit radiation rayleigh criterion rf radio frequency transmitter antenna vice versa