In what way does the antenna gain?

Question

Options

• AUsing Power Amplifiers in Antenna Systems
• BMake the radiation of the antenna more concentrated
• CUse high-efficiency antenna feeder
• DUsing equipment with low VSWR

• A
  2% (1)
• B
  83% (35)
• C
  5% (2)
• D
  10% (4)

Explanation

Antenna gain is achieved by concentrating (focusing) the radiated energy in a preferred direction rather than spreading it equally in all directions. A high-gain antenna doesn't amplify power - it reshapes the radiation pattern so more energy travels where you want it, effectively "borrowing" from weaker directions to strengthen the desired one.

Why the distractors are wrong:

• A (Power Amplifiers): Amplifiers boost transmit power at the source, which is separate from the antenna itself - adding an amplifier doesn't change antenna gain.
• C (High-efficiency feeder): Good feedline reduces loss, but reducing loss and increasing gain are different things; a perfect feedline feeding an isotropic antenna still has 0 dBi gain.
• D (Low VSWR): Low VSWR means good impedance matching, which minimizes reflected power - again, this reduces loss but does not define or create antenna gain.

Memory tip: Think of a flashlight versus a bare bulb. Same power, but the reflector focuses the light forward - that focusing effect is exactly what antenna gain means.

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