What is refraction in RF signals?

What is refraction in RF signals?

• A. When a signal passes through an object and comes out at a different angle.
• B. When a signal is reflected at normal incidence only.
• C. When a signal loses all energy upon entering a new medium.
• D. When a signal is re-emitted without changing direction.

Answer: (A)

Refraction is the bending of a radio-frequency wave as it passes from one medium to another with a different propagation speed. When the wave crosses a boundary, its speed changes, so its direction shifts according to Snell’s law. In RF, some energy may be reflected and some transmitted, and the transmitted wave travels at a different angle and wavelength in the new medium. This description matches the idea of the signal emerging at a different angle after crossing the boundary. The other statements describe reflection at a specific angle, complete absorption, or re-emission without direction change, which are not refraction.

Refraction is the bending of a radio-frequency wave as it passes from one medium to another with a different propagation speed. When the wave crosses a boundary, its speed changes, so its direction shifts according to Snell’s law. In RF, some energy may be reflected and some transmitted, and the transmitted wave travels at a different angle and wavelength in the new medium. This description matches the idea of the signal emerging at a different angle after crossing the boundary. The other statements describe reflection at a specific angle, complete absorption, or re-emission without direction change, which are not refraction.