1.

Which of the following is the condition for the Log periodic antenna to be inactive stop region?(a) \(L=\frac{λ}{2} \)(b) \(L > \frac{λ}{2} \)(c) \(L < \frac{λ}{2} \)(d) \(L = \frac{λ}{4} \)The question was asked in an interview.The doubt is from Frequency Independent Antenna in division Frequency Independent Antenna of Antennas

Answer»

The correct choice is (b) \(L > \frac{λ}{2} \)

The BEST explanation: BASED on the LENGTHS of the dipoles in LPDA, operation region is classified into three types:

 Inactive transmission line region, Active region and Inactive STOP region. The region below \(L < \frac{λ}{2} \) belongs to Inactive transmission region. The region above \(L > \frac{λ}{2} \) is Inactive stop region.


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