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November 16, 2008

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brough

A friend has just pointed out I'm being sloppy. So to be more precise:
Reflection happens when signals encounter a surface that's large compared to the signal wavelength.
Diffraction happens at the edge of a large impenetrable object (large w.r.t. the signal wavelength).
Scattering happens when a signal encounters an obstacle whose size is around that of a wavelength.

In any event, the shorter the wavelength, the more likely a signal will encounter any or all of the above. And, the shorter the wavelength, the easier it is to deploy multiple antennas and MIMO.

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