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# Solved Problems-3

Problem-3
Find the effective area of the following antennas:
1. Half-wave dipole antenna operating at 500 MHz
2. Hertzian dipole antenna operating at 100 MHz
Solution
The effective area of an antenna is given as,

where D is the directivity of the antenna.

(a) For Hertzian dipole antenna, from Problem 1, D = 1.5

For a frequency of 100 MHz, the wavelength is,

Hence, the effective area is,

(b) For half-wave dipole antenna, from Problem 1, D = 1.64

For a frequency of 500 MHz, the wavelength is,

Hence, the effective area is,