1. Large range directive antennas for wireless sensor network J.P. CHANET, K.M. HOU, T. HUMBERT, P. RAMEAU, G. DE SOUSA, D. BOFFETY Cemagref - LIMOS Workshop on Wireless Sensor Networks Marrakech – June 2007

2. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Outline Introduction Agri-environmental networks Different types of antennas Automatic control of directive antenna Conclusion

3. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Introduction: needs for agriculture High regulation, economic and society constrains  Food safety  Quality label and certification  Environment protection Agriculture in network thanks to Internet  Permanent exchange between the different industry players  Growing request on product information and registration of agricultural practices Need to collect data in large quantity  Automatic storage of data in real time and reliable  Development of distributed databases between economic players Improvement of equipment management  Development of embedded electronic devices (sensor, bus…)  Cost and sophistication growing Need of automatic data acquisition

4. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Introduction: needs for environment Data collection for ing environmental indicators  Multi scale indicators  Areas not very accessible Better management of natural resources  Management of water resources  Soil monitoring Monitoring network for natural risk prevention  Flood prevention  Monitoring of dykes, barrages...  Forest fire prevention  Volcanos survey Communication network in case of natural disaster  Infrastructures destruction  Needs for quickly operational solutions Need of intelligent autonomous devices

5. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Agri-environmental networks Close relationship between agriculture and environment:  Areas, actors, risks... Need of flexible systems to be adapted to all applications Two networks concept  « Wireless Sensor Network » (WSN)  « Mobile Ad Hoc NETwork » (MANET)

6. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Networks with cluster

7. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Node of agri-environmental network

8. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Different type of antennas Omnidirectional antennas  Radiate in all the direction with the same energy Directive antennas  Radiate in one or two preferred direction Omnidirectionnal Parabol Yagi Patch

9. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Different ranges of antennas

10. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Principle of automatic antennas

11. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Flow chart

12. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Antennas realization Audio Streaming without lost at 2 km (8km/s speed)

13. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Example of an agri-environmental network

14. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Conclusion Development of long range directive antenna Use of low cost devices compatible with agri- environmental context Different clusters of agri-environmental network reachable Validation in a real farm Development of new agri-environmental applications in European project NeTADDeD (FP6) Integration of antennas for multi robots control

15. Workshop on Wireless Sensor Networks – Marrakech – June 2007 Thank for your attention