Question: What is the relation between effective length and Effective aperture of antenna?

Options

A : A_e = \frac{dL^2\eta}{4R_{rad}}

B : A_e = \frac{dL^2}{4\eta R_{rad}}

C : A_e = \frac{dL^2 R_{rad}}{4\eta}

D : A_e = \frac{dL^2 \eta ^2}{4R_{rad}}

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