1.

Which of the following is the condition for the Log periodic antenna to be in active region?(a) \(L = \frac{λ}{2} \)(b) \(L > \frac{λ}{2} \)(c) \(L < \frac{λ}{2} \)(d) \(L = \frac{λ}{4} \)I got this question in a national level competition.Question is from Frequency Independent Antenna topic in section Frequency Independent Antenna of Antennas

Answer»

Correct ANSWER is (a) \(L = \frac{λ}{2} \)

To explain I would say: Based on the lengths of the dipoles in LPDA, operation region is CLASSIFIED into three types:

Inactive TRANSMISSION line region \(L < \frac{λ}{2} \)

Active region \(L=\frac{λ}{2} \)

Inactive stop region \(L > \frac{λ}{2}. \)


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