ANTENNA REQUIREMENTS FOR SDR AND CR

SOFTWARE DEFINED RADIO

T/R

LNA

PA

A/D

D/A

PROCESSOR

POSSIBLE SDR ARHITECTURE

It is a system in which majority of functionality are defined by software algorithms

CENTRAL ISSUES IN ANTENNA DESIGN

BANDWIDTH EXTENSION

A/D CONVERSION

FILTERING

THE ISSUE OF BANDWIDTH EXTENSION

Reconfigurable antenna change their

performance characteristics by altering

the current flow on antenna, using

mechanically movable parts, phase

shifters, attenuators, diodes etc.

POSSIBLE SOLUTION – RECONFIGURABLE ANTENNA

VIVALDI ANTENNA

Vivaldi antennas are simple planar antennas that are very broadband.

LET’S MAKE OUR OWN VIVALDI ANTENNA

HARWORK FINALLY PAYS OFF!!!

A/D CONVERSION &FILTERING

TECHNOLOGY LIMITATIONS

POWER COSUMPTION

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 the antenna.

COGNITIVE RADIO

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

ANTENNA REQUIREMENTS

Single multiband antenna- design in which one part of the antenna is active for one band while another part is active for different band

Multiple antenna for searching and communication.

ANTENNA FOR MOBILE HANDSET APPLICATION

Space demand within handset remains a big challengeInstead of multiple antenna, multiband orReconfigurable antennas can be used.Handset antennas present till date:

PIFA

Chassis Antenna

PLANAR INVERTED-F ANTNNA

CHASSIS ANTENA

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

ANTENNA FOR FIXED INFRASTRUCTURE

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.

THANK YOU