Which term describes an antenna that has a narrow beam allowing highly directional propagation?

Which term describes an antenna that has a narrow beam allowing highly directional propagation?

• A. Directional antenna
• B. Field expedient antenna
• C. Non-resonant antenna
• D. Isotropic antenna

Answer: (A)

A directional antenna is designed to concentrate radiated power into a specific direction, producing a narrow beam. This focused pattern gives high directivity and gain in the chosen direction while reducing radiation in other directions, which is exactly what “highly directional propagation” means in practice. In communications, this lets you reach farther targets or overcome interference by pointing the beam where you want the signal to go. To contrast, an isotropic antenna is a theoretical reference that would radiate equally in all directions, with no preferred beam or directionality. A non-resonant antenna isn’t efficient at the operating frequency and doesn’t imply a narrow beam by itself. A field expedient antenna is a makeshift or improvised design and isn’t defined by a deliberate narrow-beam pattern.

A directional antenna is designed to concentrate radiated power into a specific direction, producing a narrow beam. This focused pattern gives high directivity and gain in the chosen direction while reducing radiation in other directions, which is exactly what “highly directional propagation” means in practice. In communications, this lets you reach farther targets or overcome interference by pointing the beam where you want the signal to go.

To contrast, an isotropic antenna is a theoretical reference that would radiate equally in all directions, with no preferred beam or directionality. A non-resonant antenna isn’t efficient at the operating frequency and doesn’t imply a narrow beam by itself. A field expedient antenna is a makeshift or improvised design and isn’t defined by a deliberate narrow-beam pattern.