Modulation helps to reduce the antenna size in wireless communication-Explain.

Explanation

(i) Antenna is used at both transmitter and receiver end. Antenna height is an important parameter.
(ii) The height of the antenna must be a multiple of `lamda/4`.
`h=lamda/4`
(iii) where `lamda` is wavelength `(lamda=c/v)`,c is the velocity of light and v is the frequency of the signal to be transmitted.
(iv) If the frequency of the modulated signal is high, the height of the antenna is decreased.