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What type of antenna is the Yagi antenna?

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What type of antenna is the Yagi antenna?

(a) Surface-wave

(b) Resonant

(c) Traveling wave

(d) Aperture

The question was asked during an interview.

My doubt is from Antenna Tradeoffs topic in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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Best answer
The correct option is (a) Surface-wave

The best I can explain: The Yagi antenna is a surface-wave antenna operating at 1 – 6 GHz range. It is used as radar feed and array. The setup of a Yagi antenna consists of a driven element, a reflector, and one or more directors.

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