volume | PIER Journals

Abstract

A simple metamaterial resonator structure based efficiency electrically small semi-circular loop antenna (ESSCLA) is proposed. It is demonstrated numerically that capacitive offered by the simple metamaterial resonator structure can counteract inductive impedance of the ESSCLA at the resonance frequency. The overall structures of ESSCLA can be fabricated on one dielectric substrate, and match conjugate to a 50 Ohm coaxial transmission line source without additional matching network. The size of the proposed ESSCLA is ka = 0.6745 by Chu limit. The resonance frequency is 3.2239 GHz, and impedance bandwidth (S11<-10) is from 3.19 GHz to 3.26 GHz about 0.07 GHz, the relative bandwidth is about 2.2%. The measure results accord with the simulation results well. The peak gain is 4.58 dB. The radiation efficiency is 97.81%, the overall efficiency is 96.71% at the resonance frequency. The proposed antenna has advantages of efficiency, high gain, low cost, small size, and light weight and will be applied to wireless communication systems for required small antennas.

1. Wheeler, H. A., "Fundamental limitations of small antennas," IRE Proc., Vol. 35, 1479-1484, Dec. 1947.
doi:10.1109/JRPROC.1947.226199 Google Scholar

2. Chu, L. J., "Physical limitations in omnidirectional antennas," J. Appl. Phys., Vol. 19, 1163-1175, 1948.
doi:10.1063/1.1715038 Google Scholar

3. Thal, H. L., "New radiation Q limits for spherical wire antennas," IEEE Trans. Antennas Propag., Vol. 54, No. 10, October 2006.
doi:10.1109/TAP.2006.882184 Google Scholar

4. Best, S. R., "Low Q electrically small linear and elliptical polarized spherical dipole antennas," IEEE Trans. Antennas Propag., Vol. 53, No. 3, March 2005.
doi:10.1109/TAP.2004.842600 Google Scholar

5. Foltz, H. D., J. S. McLean, and G. Crook, "Disk-loaded monopoles with parallel strip elements," IEEE Trans. Antennas Propag., Vol. 46, 1894-1896, 1998.
doi:10.1109/8.743844 Google Scholar

6. Veselago, V., "The electrodynamics of substances with simultaneously negative values of ε and μ," Soviet Physics Uspekhi, Vol. 10, No. 4, 509-514, 1968.
doi:10.1070/PU1968v010n04ABEH003699 Google Scholar

7. Ziolkowski, R. W. and A. Kipple, "Application of double negative metamaterials to increase the power radiated by electrically small antennas," IEEE Trans. Antennas Propag., Vol. 51, 2626-2640, October 2003.
doi:10.1109/TAP.2003.817561 Google Scholar

8. Ziolkowski, R. W. and A. D. Kipple, "Reciprocity between the effects of resonant scattering and enhanced radiated power by electrically emall antennas in the presence of nested metamaterial shells," Physical Review E, Vol. 72, 036602, September 2005.
doi:10.1103/PhysRevE.72.036602 Google Scholar

9. Ziolkowski, R. W. and A. Erentok, "Metamaterial-based efficient electrically small antennas," IEEE Trans. Antennas Propag., Vol. 54, 2113-2130, July 2006.
doi:10.1109/TAP.2006.877179 Google Scholar

10. Ziolkowski, R. W. and A. Erentok, "At and beyond the chu limit: Passive and active broad bandwidth metamaterial-based efficient electrically small antennas," IET Microw., Antennas Propag., Vol. 1, 116-128, February 2007.
doi:10.1049/iet-map:20050342 Google Scholar

11. Kim, H. Y., J. K. Kim, J. H. Kim, Y. J. Kim, and H. M. Lee, "Design of metamaterial structure based electrically small monopole antenna," 2007 Autumn Microwave & Radio Wave Conference, Vol. 30, 577-580, September 2007. Google Scholar

12. Ghosh, B., S. Ghosh, and A. B. Kakade, "Investigation of gain enhancement of electrically small antennas using double-negative, single-negative, and double-positive materials," Physical Review E, Vol. 78, 026611, 2008.
doi:10.1103/PhysRevE.78.026611 Google Scholar

13. Stuart, H. R. and A. Pidwerbetsky, "Electrically small antenna elements using negative permittivity resonators," IEEE Trans. Antennas Propag., Vol. 54, 1644-1653, 2006. Google Scholar

14. Stuart, H. R., "The application of negative permittivity materials and metamaterials in electrically small antennas," IEEE Antennas and Wireless Propagation Letters, Vol. 6, 460-462, 2007.
doi:10.1109/LAWP.2007.905018 Google Scholar

15. Erentok, A. and R. W. Ziolkowski, "Metamaterial-inspired efficient electrically small antennas," IEEE Trans. Antennas Propag., Vol. 56, No. 3, 691-706, March 2008.
doi:10.1109/TAP.2008.916949 Google Scholar

16. Li, L.-W., C.-P. Lim, and M.-S. Leong, "Near fields of electrically small thin square and rectangular loop antennas," Progress In Electromagnetics Research, Vol. 31, 181-193, 2001.
doi:10.2528/PIER00062202 Google Scholar

17. Huang, M. D. and S. Y. Tan, "Efficient electrically small prolate spheroidal antennas coated with a shell of double-negative metamaterials," Progress In Electromagnetics Research, Vol. 82, 241-255, 2008.
doi:10.2528/PIER08031604 Google Scholar

18. Balanis, C. A., Antenna Theory, 3 Ed., Wiley, 2005.

19. Ziolkowski, R. W. and E. Heyman, "Wave propagation in media having negative permittivity and permeability," Physical Review E, Vol. 64, 056625, 2001.
doi:10.1103/PhysRevE.64.056625 Google Scholar

20. Ziolkowski, R. W., "Reply to "Comments on ‘Application of double negative materials to increase the power radiated by electrically small antennas’ "," IEEE Transactions on Antennas and Propagation, Vol. 54, No. 2, February 2006.
doi:10.1109/TAP.2005.863161 Google Scholar

21. Kildal, P.-S., "Application of double negative materials to increase the power radiated by electrically small antennas," IEEE Transactions on Antennas and Propagation, Vol. 54, No. 2, 766, February 2006.
doi:10.1109/TAP.2005.863160 Google Scholar

Dr. Zhangshan Duan

Prof. Shaobo Qu

Dr. Yiwei Hou