Question
What is the primary function of antenna traps?
Answer Options
- A) To enable multiband operation
- B) To notch spurious frequencies
- C) To provide balanced feed point impedance
- D) To prevent out-of-band operation
Correct Answer: A
Explanation
Antenna traps are resonant circuits (parallel LC networks) inserted into the radiating element of an antenna. When the operating frequency is below the trap’s resonant frequency, the trap acts as an inductor, electrically loading the antenna to resonance. When the operating frequency is at the trap’s resonant frequency, the trap acts as an extremely high impedance (an open circuit).
The primary function of antenna traps is to enable multiband operation. For example, on a trap dipole, the traps will isolate the outer sections of the antenna on the higher bands, effectively making the inner section the radiator, while allowing the entire length to be used on the lowest band.
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