(I) Fig. shows the dipole
antenna and is basically used as radio antenna. The
physical length of antenna is λ/2 where λ is wavelength
in free space at the frequency of operation of station.
(II) A microwave antenna is used for transmitting
and receiving signals in the microwave range (1 to 50 GHz).
This antenna has great directivity. For this reason, it is
used in render system and for receiving broadcast directly
from the satellites.