What happens to waves when they hit smaller apertures than their wavelenghts?

Roderick Bradley

Roderick Bradley

Answered question

2022-08-09

What happens to waves when they hit smaller apertures than their wavelenghts?

Answer & Explanation

Brooks Hogan

Brooks Hogan

Beginner2022-08-10Added 18 answers

I cannot speak for how to match with a mechanical resonator but you can match arbitrarily well any EM radiator that is small relative to its wavelength at one (1) frequency. This means that the radiator (loop or dipole, monopole, etc.) will absorb all radiation coming from directions in which it can radiate as a source without any reflection. The rest is diffracted. All elementary dipoles, be they electric or magnetic, are limited by bandwidth and not the ability of radiating if matched properly by some finite set of inductors and capacitors, and because of reciprocity this property also holds in receiver as well as transmitting antennas.

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