volume | PIER Journals

Abstract

In this paper, two compact patch antenna designs for a new application --- outdoor RF energy harvesting in powering a wireless soil sensor network --- are presented. The first design is a low-profile folded shorted patch antenna (FSPA), with a small ground plane and wide impedance bandwidth. The second design is a novel FSPA structure with four pairs of slot embedded into its ground plane. Performance of both antennas was first simulated using CST Microwave Studio. Antenna prototypes were then fabricated and tested in the anechoic chamber and in their actual operating environment --- an outdoor field. It was found that the FSPA with slotted ground plane achieved a comparable impedance bandwidth to the first design, with an overall size reduction of 29%. Simulations were also carried out to investigate the effects of different design parameters on the performance of the proposed slotted ground plane FSPA.

1. Akyildiz, I. F., W. Su, Y. Sankarasubramaniam, and E. Cayirci, "Wireless sensor networks: A survey," Computer Networks, Vol. 38, 393-422, 2002.
doi:10.1016/S1389-1286(01)00302-4

2. Ning, X., R. Sumit, C. Krishna Kant, G. Deepak, B. Alan, G. Ramesh, and E. Deborah, "A wireless sensor network for structural monitoring," Proceedings of the 2nd International Conference on Embedded Networked Sensor Systems, Baltimore, USA, 2004.

3. Alan, M., C. David, P. Joseph, S. Robert, and A. John, "Wireless sensor networks for habitat monitoring," Proceedings of the 1st ACM International Workshop on Wireless Sensor Networks and Applications, Atlanta, USA, 2002.

4. Dobrescu, R., M. Dobrescu, D. Popescu, and H. G. Coanda, "Embedded wireless homecare monitoring system," International Conference on eHealth, Telemedicine, and Social Medicine, 66-66, 2009.
doi:10.1109/eTELEMED.2009.22

5. Virone, G., A. Wood, L. Selavo, Q. Cao, L. Fang, T. Doan, Z. He, and J. Stankovic, "An advanced wireless sensor network for health monitoring," Transdisciplinary Conference on Distributed Diagnosis and Home Healthcare, April 2006.

6. Baggio, A., "Wireless sensor networks in precision agriculture," ACM Workshop Real-World Wireless Sensor Networks, 2005.

7. John, M., M. Paul, G. Siddeswara Mayura, P. Wei, H. Daniel, and T. Andrew, "Wireless sensor network deployment for water use efficiency in irrigation," Proceedings of the Workshop on Real-world Wireless Sensor Networks, Glasgow, Scotland, 2008.

8. Paradiso, J. A. and T. Starner, "Energy scavenging for mobile and wireless electronics," IEEE Pervasive Computing, Vol. 4, 18-27, January--March 2005.
doi:10.1109/MPRV.2005.9

9. Thomas, J. P., M. A. Qidwai, and J. C. Kellogg, "Energy scavenging for small-scale unmanned systems," Journal of Power Sources, Vol. 159, 1494-1509, 2006.
doi:10.1016/j.jpowsour.2005.12.084

10. Wright, P., P. R. Green, B. D. Grieve, T. A. York, and M. Hoppe, "Automated termite sensing," IEEE Sensors Applications Symposium, 99-104, 2009.
doi:10.1109/SAS.2009.4801786

11. Li, P., K. L. Lau, and K. M. Luk, "Wideband folded shorted patch antenna with low profile," IEEE Electronics Letters, Vol. 41, 112-113, 2005.
doi:10.1049/el:20057545

12. Mak, C. L., H. Wong, and K.-M. Luk, "High-gain and wide-band single-layer patch antenna for wireless communications," IEEE Transactions on Vehicular Technology, Vol. 54, 33-40, 2005.
doi:10.1109/TVT.2004.838899

13. Islam, M. T., M. N. Shakib, and N. Misran, "Broadband E-H shaped microstrip patch antenna for wireless systems," Progress In Electromagnetics Research, Vol. 98, 163-173, 2009.
doi:10.2528/PIER09082302

14. Secmen, M. and A. Hizal, "A dual-polarized wide-band patch antenna for indoor mobile communication applications," Progress In Electromagnetics Research, Vol. 100, 189-200, 2010.
doi:10.2528/PIER09112607

15. Budak, E., B. Catay, I. Tekin, H. Yenigun, M. Abbak, and S. Drannikov, "Microstrip patch antenna for RFID applications," 1st Annual RFID Eurasia, 1-3, 2007.
doi:10.1109/RFIDEURASIA.2007.4368135

16. Lin, P.-J., H.-C. Teng, Y.-J. Huang, and M.-K. Chen, "Design of patch antenna for RFID reader applications," International Conference on Anti-counterfeiting, Security, and Identification in Communication, 193-196, 2009.

17. Chandran, A. R., G. A. Conway, and W. G. Scanlon, "Compact low-profile patch antenna for medical body area networks at 868 MHz," Antennas and Propagation Society International Symposium, 1-4, 2008.

18. Lau, K. L., K. C. Kong, and K. M. Luk, "A miniature folded shorted patch antenna for dual-band operation," IEEE Transactions on Antennas and Propagation, Vol. 55, 2391-2398, 2007.
doi:10.1109/TAP.2007.898649

19. Sim, C.-Y.-D. and T.-Y. Han, "GPS antenna design with slotted ground plane," Microwave and Optical Technology Letters, Vol. 50, 818-821, 2008.
doi:10.1002/mop.23215

20. Soliman, A. S., A. A. Esmat, and A.-A. Darwish, "Slotted ground plane of rectangular patch microstrip antenna with enhanced bandwidth and size reduction," Proceedings of the 12th WSEAS International Conference on Communications, Heraklion, Greece, 2008.

21. Chiou, T.-W. and K.-L. Wong, "Designs of compact microstrip antennas with a slotted ground plane," IEEE Antennas and Propagation Society International Symposium, Vol. 2, 732-735, 2001.

22. Brown, D., RFID Implementation, McGraw-Hill Professional, 2006.

23. Harrington, R. F., "Effect of antenna size on gain, bandwidth, and efficiency," J. Res. Nat. Bureau Standards, Vol. 64D, 1-12, January--February 1960.

24. Akyildiz, I. F. and E. P. Stuntebeck, "Wireless underground sensor networks: Research challenges," Ad Hoc Networks, Vol. 4, 669-686, 2006.
doi:10.1016/j.adhoc.2006.04.003

25. Loh, T. H., M. Alexander, F. Widmer, P. Miller, and D. Knight, "Validation of a new small-antenna radiated testing range," 3rd European Conference on Antennas and Propagation, 699-703, Berlin, Germany, March 2009.

26. Lee, W. C. Y., Mobile Communications Engineering, McGraw-Hill, 1982.

Mr. Zhi Wei Sim

Dr. Roger Shuttleworth

Dr. Martin J. Alexander

Dr. Bruce D. Grieve