1. ANTENNA
REQUIREMENTS FOR
SDRANDCR

2. SOFTWARE
DEFINED
RADIO
T/R
LNA
PA
A/D
D/A
PROCES
SOR
POSSIBLESDR ARHITECTURE
It is a system in which majority of functionality are defined by software algorithms

3. CENTRAL
ISSUES IN
ANTENNA
DESIGN
BANDWIDTH EXTENSION
A/DCONVERSION
FILTERING

4. THE ISSUEOF
BANDWIDTH
EXTENSION
 Reconfigurable antenna change their
performance characteristics by altering
the current flow on antenna, using
mechanically movable parts, phase
shifters, attenuators, diodes etc.
POSSIBLESOLUTION – RECONFIGURABLEANTENNA

5. VIVALDI
ANTENNA
Vivaldi antennas are simple planar antennas that are very
broadband.

6. LET’S MAKE OUR OWN VIVALDIANTENNA

8. HARWORK FINALLY PAYS OFF!!!

9. A/D
CONVERSION
&
FILTERING
 TECHNOLOGY LIMITATIONS
 POWERCOSUMPTION
 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.

10. 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

11. ANTENNA
REQUIREMEN
TS
 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.

12. ANTENNA
FOR MOBILE
HANDSET
APPLICATION
Space demand within handset remains a big challenge
Instead of multiple antenna, multiband or
Reconfigurable antennas can be used.
Handset antennas present till date:
PIFA
ChassisAntenna

13. PLANAR
INVERTED-F
ANTNNA

14. 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

15. ANTENNA
FOR FIXED
INFRASTRUCT
URE
 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.

16. THANKYOU