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Frage 142

What are circularly polarized electromagnetic waves?

  1. Waves with an electric field bent into a circular shape
  2. Waves with rotating electric and magnetic fieldsRichtige Antwort
  3. Waves that circle Earth
  4. Waves produced by a loop antenna

Erklärung

A circularly polarized wave is the sum of two equal linear components a quarter cycle apart in phase, so the field vectors rotate once per RF cycle as the wave advances while their magnitude stays constant. The fields are not bent into circles, the wave's route around the Earth is a separate matter, and a plain loop antenna radiates linear polarization.

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Frage 142: What are circularly polarized electromagnetic waves? · FCC Amateur Extra Class (Element 4) · Questena