Antenna requirements for sdr and cr

540 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
540
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
20
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Antenna requirements for sdr and cr

  1. 1. ANTENNA REQUIREMENTS FOR SDRANDCR
  2. 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. 3. CENTRAL ISSUES IN ANTENNA DESIGN BANDWIDTH EXTENSION A/DCONVERSION FILTERING
  4. 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. 5. VIVALDI ANTENNA Vivaldi antennas are simple planar antennas that are very broadband.
  6. 6. LET’S MAKE OUR OWN VIVALDIANTENNA
  7. 7. HARWORK FINALLY PAYS OFF!!!
  8. 8. 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.
  9. 9. 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
  10. 10. 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.
  11. 11. 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
  12. 12. PLANAR INVERTED-F ANTNNA
  13. 13. 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
  14. 14. 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.
  15. 15. THANKYOU

×