It is a system in which majority of functionality are defined by software algorithms
Reconfigurable antenna change their
performance characteristics by altering
the current flow on antenna, using
mechanically movable parts, phase
shifters, attenuators, diodes etc.
POSSIBLESOLUTION – RECONFIGURABLEANTENNA
Vivaldi antennas are simple planar antennas that are very
The trend to on chip transceivers suggest that integration of
filtering into antennas will become important but wide
bandwidths indicate that these filters must be reconfigurable with
CR is a radio that can monitor its local radio environment and/or its
geographical position and, using these data, adjust its characteristics
in order to optimize its performance.
COGNITIVE RADIO ARCHITECTURE
Single multiband antenna- design in which one part of the
antenna is active for one band while another part is active for
Multiple antenna for searching and communication.
Space demand within handset remains a big challenge
Instead of multiple antenna, multiband or
Reconfigurable antennas can be used.
Handset antennas present till date:
A coupling element is used to excite
the entire PCB of mobile to act as an
antenna and a tuning element to
Optimize the coupling
The requirements and hence the technology of antennas
for base stations depends largely on the application
considered. MIMO antenna and Smart antennas can be used.
Smart Antennas are antenna arrays with smart signal processing
algorithms to track and locate the antenna beam on the target.