Question

The power radiated by linear antenna of length T is proportional to........................

(λ= wavelength)

1. `lambda/ l`
2. `[lambda/l]^2`
3. `l/lambda`
4. `[l/lambda]^2`

Answer 1

(d) (l/λ)²

Effective power radiated by the antenna would be too small, because the power radiated by a linear antenna of length ‘l’ into space is (l/λ)².

As high powers are needed for good transmission, so higher frequency is required which can be achieved by modulation.