Which of the following is an advantage of a log-periodic antenna?
The correct answer is A: Wide bandwidth. An advantage of a log-periodic antenna is wide bandwidth. Log-periodic antennas are designed to work over a wide frequency range with consistent performance. For amateur radio operators, this makes them ideal for multiband operation. Understanding this helps when selecting antennas.
Exam Tip
Log-periodic advantage = wide bandwidth. Think 'L'og-'P'eriodic = 'L'arge 'P'assband (wide bandwidth). Log-periodic antennas are designed to work over a wide frequency range with consistent performance. Not higher gain per element, not harmonic suppression, not polarization diversity - just wide bandwidth.
Memory Aid
"Log-periodic advantage = wide bandwidth. Think 'L'og-'P'eriodic = 'W'ide 'P'assband. Log-periodic antennas are designed to work over a wide frequency range with consistent performance. Ideal for multiband operation."
Real-World Application
A log-periodic antenna: It works over a wide frequency range (e.g., entire HF band) with consistent performance. Unlike Yagis which are narrow-band, log-periodics have wide bandwidth - they maintain good performance across a wide frequency range. This makes them ideal for multiband operation. Wide bandwidth is the key advantage.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Log-periodic doesn't have higher gain per element than Yagi - Yagis typically have higher gain per element. Higher gain per element isn't the advantage.
Option C: Incorrect. Log-periodic doesn't have harmonic suppression - it works on multiple frequencies, not suppressing harmonics. Harmonic suppression isn't the advantage.
Option D: Incorrect. Log-periodic doesn't have polarization diversity - it's typically single polarization. Polarization diversity isn't the advantage.
题目解析
The correct answer is A: Wide bandwidth. An advantage of a log-periodic antenna is wide bandwidth. Log-periodic antennas are designed to work over a wide frequency range with consistent performance. For amateur radio operators, this makes them ideal for multiband operation. Understanding this helps when selecting antennas.
考试技巧
Log-periodic advantage = wide bandwidth. Think 'L'og-'P'eriodic = 'L'arge 'P'assband (wide bandwidth). Log-periodic antennas are designed to work over a wide frequency range with consistent performance. Not higher gain per element, not harmonic suppression, not polarization diversity - just wide bandwidth.
记忆口诀
Log-periodic advantage = wide bandwidth. Think 'L'og-'P'eriodic = 'W'ide 'P'assband. Log-periodic antennas are designed to work over a wide frequency range with consistent performance. Ideal for multiband operation.
实际应用示例
A log-periodic antenna: It works over a wide frequency range (e.g., entire HF band) with consistent performance. Unlike Yagis which are narrow-band, log-periodics have wide bandwidth - they maintain good performance across a wide frequency range. This makes them ideal for multiband operation. Wide bandwidth is the key advantage.
错误选项分析
Option B: Incorrect. Log-periodic doesn't have higher gain per element than Yagi - Yagis typically have higher gain per element. Higher gain per element isn't the advantage. Option C: Incorrect. Log-periodic doesn't have harmonic suppression - it works on multiple frequencies, not suppressing harmonics. Harmonic suppression isn't the advantage. Option D: Incorrect. Log-periodic doesn't have polarization diversity - it's typically single polarization. Polarization diversity isn't the advantage.
知识点
Log-periodic antenna, Wide bandwidth, Multiband operation, Frequency range
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.