1.

What is the necessary condition for a helical antenna to operate in the axial mode?(a) πD

Answer»

The CORRECT CHOICE is (b) πD ≈ λ

For EXPLANATION I would say: In Normal MODE: πD << λ

Axial mode:C ≈ λ

Conical mode: C ≈n λ

D=0 then there is no loop and is no longer helical.



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