Used primarily in mobile or cellular telephony
“Learn” where the mobile receiver is
Can track and focus RF energy in specific direction
Classes of smart antennas
A switched beam antenna
Uses several narrow beam antennas pointing in different directions
Adaptive or phased array antennas
Divided into a matrix of radiating elements
Has the effect of sending the energy beam in a particular direction (generally called “beam forming”)
Used extensively in ultramodern radar systems.