What are the characteristics of an elliptical filter?
The correct answer is C: Extremely sharp cutoff with one or more notches in the stop band. What are the characteristics of an elliptical filter is extremely sharp cutoff with one or more notches in the stop band. Elliptical filters have sharp cutoff and stop-band notches. For amateur radio operators, this is important for filter design. Understanding this helps when selecting filters.
Exam Tip
Elliptical filter characteristics = extremely sharp cutoff with one or more notches in stop band. Think 'E'lliptical = 'E'xtremely 'S'harp cutoff + 'N'otches. Elliptical filters have sharp cutoff and stop-band notches. Not gradual rolloff, not flat passband - just sharp cutoff with stop-band notches.
Memory Aid
"Elliptical filter characteristics = extremely sharp cutoff with one or more notches in stop band. Think 'E'lliptical = 'S'harp cutoff + 'N'otches. Elliptical filters have sharp cutoff and stop-band notches. Important for filter design."
Real-World Application
An elliptical filter: Its characteristics are extremely sharp cutoff with one or more notches in the stop band. Elliptical filters provide the sharpest cutoff but have notches in the stop band. This is the characteristic - sharp cutoff with stop-band notches.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Gradual passband rolloff with minimal stop-band ripple isn't elliptical - elliptical has sharp cutoff with stop-band notches. Gradual rolloff isn't the characteristic.
Option B: Incorrect. Extremely flat passband with gradually rounded stop-band corners isn't elliptical - elliptical has sharp cutoff with stop-band notches. Flat passband isn't the characteristic.
Option D: Incorrect. Gradual passband rolloff with extreme stop-band ripple isn't elliptical - elliptical has sharp cutoff with stop-band notches. Gradual rolloff isn't the characteristic.
题目解析
The correct answer is C: Extremely sharp cutoff with one or more notches in the stop band. What are the characteristics of an elliptical filter is extremely sharp cutoff with one or more notches in the stop band. Elliptical filters have sharp cutoff and stop-band notches. For amateur radio operators, this is important for filter design. Understanding this helps when selecting filters.
考试技巧
Elliptical filter characteristics = extremely sharp cutoff with one or more notches in stop band. Think 'E'lliptical = 'E'xtremely 'S'harp cutoff + 'N'otches. Elliptical filters have sharp cutoff and stop-band notches. Not gradual rolloff, not flat passband - just sharp cutoff with stop-band notches.
记忆口诀
Elliptical filter characteristics = extremely sharp cutoff with one or more notches in stop band. Think 'E'lliptical = 'S'harp cutoff + 'N'otches. Elliptical filters have sharp cutoff and stop-band notches. Important for filter design.
实际应用示例
An elliptical filter: Its characteristics are extremely sharp cutoff with one or more notches in the stop band. Elliptical filters provide the sharpest cutoff but have notches in the stop band. This is the characteristic - sharp cutoff with stop-band notches.
错误选项分析
Option A: Incorrect. Gradual passband rolloff with minimal stop-band ripple isn't elliptical - elliptical has sharp cutoff with stop-band notches. Gradual rolloff isn't the characteristic. Option B: Incorrect. Extremely flat passband with gradually rounded stop-band corners isn't elliptical - elliptical has sharp cutoff with stop-band notches. Flat passband isn't the characteristic. Option D: Incorrect. Gradual passband rolloff with extreme stop-band ripple isn't elliptical - elliptical has sharp cutoff with stop-band notches. Gradual rolloff isn't the characteristic.
知识点
Characteristics, Elliptical filter, Extremely sharp cutoff, One or more notches, Stop band
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.