Hackaday · Creativity & design

Raindrops as Antennas

Raindrops and atmospheric moisture can act as antennas, interacting with electromagnetic radiation. This interaction can be beneficial or detrimental depending on the application, such as broadcasting or weather radar operation.

In the Rayleigh regime, electromagnetic radiation passing through small droplets disrupts their neutral alignment, causing them to become dipole antennas that move with the incoming frequency.

The backscattered signal returns to the emitter, like a weather radar. The strength of this signal is determined by the volume and permittivity of the moisture sphere.

This phenomenon is useful for weather radar systems aiming to map moisture in clouds, including the presence of snow.

The underlying principles involve significant mathematical calculations, detailed in a video and a related Python notebook.

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