Discussion

Match the following List I and List II :

List I	List II
(a) Directivity (D)	(1) \(\frac{\lambda^{2}G}{4\pi}\)
(b) Antenna Efficiency (n)	(2) \(\geq 2D^{2}/\lambda\)
(c) Fraunhofer Region (R)	(3) Radiated Power / Total Input Power
(d) The effective area of an antenna (Ae)	(4) Max Radiation Intensity of Single Antenna / Radiation Intensity of an Isotropic Antenna

Codes : (a) (b) (c) (d)

Answer: C

The correct code is (4) (3) (2) (1).

(a) Directivity is the maximum radiation intensity of the antenna divided by the radiation intensity of an isotropic antenna.
(b) Antenna efficiency is the radiated power divided by the total input power.
(c) The Fraunhofer (far-field) region begins at a distance of at least 2D²/λ, where D is the largest dimension of the antenna.
(d) The effective area of an antenna is λ²G/4π.

Options A and D both give directivity the far-field distance, and option B gives it the effective-area formula.

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