🔍 Key Concepts

• Waveguide basic structure and purpose • Relationship between waveguides and transmission lines • Common physical shapes of microwave waveguides

💭 Think About

• Think about how radio-frequency energy, especially at microwave frequencies, is carried from one place to another—what structures are typically used? • Consider whether each option (A, B, C) can be true at the same time, or if one of them contradicts the others. • Ask yourself: is a waveguide limited to one description, or does it combine several characteristics mentioned in the choices?

✅ Before You Answer

• Verify what a waveguide physically looks like in typical radar/microwave systems on ships (rectangular or circular metal sections). • Check whether a waveguide is considered a kind of transmission line in RF theory. • Confirm if waveguides are used as practical transmission lines specifically for higher frequencies (like radar).