why do we need carrier modulation

[darock]

why do we need to do modulation

Why is modulation required from an antenna perspective.


I know the antenna size should be in the order of the carrier wavelength. Thats why we go for higher frequencies.

Is there any power connotation to that : like higher frequencies require less power ?

 

[behy]

why we need modulation

small size of antenna is mainely because the antenna dimesion is approximately in the order of wavelength.
increasing the mobility of tranceiver is another reason