volume | PIER Journals

Abstract

A novel dual-helix monopole antenna with circular polarization (CP) operation is proposed. By utilizing a pair of asymmetrical strip-sleeves shorted at the ground plane, the proposed CP design at 2.45 GHz ISM band can easily be achieved and provides the impedance bandwidth (RL≧10 dB) about 240 MHz and the 6 dB axial-ratio (AR) bandwidth about 126 MHz. The measured peak gain and radiation efficiency are about 9.1 dBic and 81% across the operating bands, respectively.

1. Yazdandoost, K. Y., "A 2.4 GHz antenna for medical implanted communications," Asia Pacific Microwave Conference, APMC, 1775-1778, 2009. Google Scholar

2. Ung, J. and T. Karacolak, "A wideband implantable antenna for continuous health monitoring in the med radio and ISM bands," IEEE Antenna and Wireless Propag. Lett., Vol. 11, 1642-1645, 2012.
doi:10.1109/LAWP.2013.2238498 Google Scholar

3. Fernandez, C. J. S., O. Q. Teruel, J. R. Carrion, L. I. Sanchez, and E. R. Iglesias, "Dual-band microstrip patch antenna based on short-circuited ring and spiral resonators for implantable medical devices," IET Microwaves, Antennas & Propag., Vol. 4, No. 8, 1048-1055, Aug. 2010.
doi:10.1049/iet-map.2009.0594 Google Scholar

4. Mizuno, H., M. Takahashi, K. Saito, and K. Ito, "Development of an implanted helical folded dipole antenna for 2.45GHz applications," International Workshop on Antenna Technology, iWAT, 1-4, 2010. Google Scholar

5. Karacolak, T., A. Z. Hood, and E. Topsakal, "Design of a dual-band implantable antenna and development of skin mimicking gels for continuous glucose monitoring," IEEE Trans. Microwave Theory and Techniques, Vol. 56, 1001-1008, Apr. 2008.
doi:10.1109/TMTT.2008.919373 Google Scholar

6. Tehran, H. M. and R. Abhari, "A dual-band meander monopole antenna for on-body devices," IEEE International Symposium on Antennas and Propagation, 160-163, 2011. Google Scholar

7. Ito, K., W. Xia, M. Takahashi, and K. Saito, "An implanted cavity slot antenna for medical communication systems," 3rd European Conference on Antennas and Propagation, EuCAP, 718-721, 2009. Google Scholar

8. Yu, X. Y., G. L. Li, L. W. Zhang, and Z. H. Wang, "Design and test of a miniature 2.45GHz antenna for implantable medical devices," IEEE 14th International Mixed-Signals, Sensors, and Systems Test Workshop, 1-5, 2008. Google Scholar

9. Xia, W., K. Saito, M. Takahashi, and K. Ito, "Performances of an implanted cavity slot antenna embedded in the human arm," IEEE Trans. Antenna and Propag., Vol. 57, 894-899, Apr. 2009.
doi:10.1109/TAP.2009.2014579 Google Scholar

10. Kwak, S. I., K. Chang, and Y. J. Yoon, "Small spiral antenna for wideband capsule endoscope system," Electronics Letters, Vol. 42, 1328-1329, Nov. 2006. Google Scholar

11. Liao, M. T. and Z. S. Zheng, "Compact dual circularly polarized microstrip transceiver antenna for medical applications," International Conference on Microwave and Millimeter Wave Technology, 14, 2012. Google Scholar

12. McCarrick, C. D., "A combination monopole/quadrifilar helix antenna for S-band terrestrial/satellite applications," Microwave Journal, May 2001. Google Scholar

13. Xu, P., Z. Yan, X. Yang, T. Zhang, and G. Yuan, "Miniature folded printed quadrifilar helical antenna with integrated compact feeding network," Progress In Electromagnetics Research Letters, Vol. 45, 13-18, 2014.
doi:10.2528/PIERL13122302 Google Scholar

14. Huang, H. S. and J. H. Lu, "Dual-band circularly polarized monopole antenna for WLAN applications," International Symposium on Antenna and Propagation, 360-362, 2013. Google Scholar

15., http://ansys.com/Products/Simulation+Technology/Electronics/Signal+Integrity/ANSYS+HFSS/Features. (HFSS version 12). Google Scholar

16. IEEE Standard Test Procedures for Antennas: ANSI/IEEE-STD149-1979, Sec. 12–13, , 94–112. Google Scholar

17. Toh, B. Y., R. Cahill, and V. F. Fusco, "Understanding and measuring circular polarization," IEEE Trans. Education, Vol. 46, 313-318, Aug. 2003. Google Scholar

Prof. Jui-Han Lu

Dr. Yuan-Chih Lin

Dr. Hao-Shiang Huang