This paper presents a design of Wide-Band Microstrip Yagi-Uda antenna with high gain and high front to back (F/B) ratio. Numerical and measured results of our design show more than 18dB front to back ratio at 5.5 GHz and no backward radiation at 5.2 GHz. An impedance bandwidth of 22.05% was achieved around 5.5 GHz. The antenna gain (10-12.4 dBi) can be varied to be suitable for various applications. Measured return loss and radiation pattern of this antenna is presented to validate the results of simulations by two methods. The first method based on finite element method (FEM) and the second one based on finite integral technique (FIT) were used to analyze antenna structure, and subsequently the Genetic Algorithm (GA) was applied by using HFSS simulator to obtain the optimized parameters. In order to find the best design method for this antenna, the effect of distance between the parasitic elements of proposed antenna was studied. Finally two microstrip Yagi-Uda array antennas were combined to increase the gain of antenna. To demonstrate the major benefits, a comparison of our initial and final designs of Yagi-Uda antenna is provided.
"A Novel Wide-Band Microstrip Yagi-Uda Array Antenna for WLAN Applications," Progress In Electromagnetics Research B,
Vol. 16, 389-406, 2009. doi:10.2528/PIERB09053101
1. Takimoto, Y., "Recent activities on millimeter wave indoor LAN system development in Japan," Dig. IEEE Microwave Theory and Techniques Society Int. Symp., 405-408, Jun. 1995.
2. Morinaga, N. and A. Hashimoto, "Technical trend of multimedia mobile and broadband wireless access systems," Trans. IEICE, Vol. E82-B, No. 12, 1897-1905, Dec. 1999.
3. Wu, Y.-J., B.-H. Sun, J.-F. Li, and Q.-Z. Liu, "Tripl-band omni-directional antenna for WLAN application," Progress In Electromagnetics Research, Vol. 76, 477-484, 2007. doi:10.2528/PIER07080601
4. Misra, I. S., R. S. Chakrabarty, and B. B. Mangaraj, "Design, analysis and optimization of V-dipole and its three-element Yagi-Uda array," Progress In Electromagnetics Research, Vol. 66, 137-156, 2006. doi:10.2528/PIER06102604
5. Tran, A. and M. C. E. Yagoub, "Intertwined two-section dual-polarized log periodic dipole antenna," PIERS Proceedings, 30-33, Prague, Czech Republic, Aug. 27-30, 2007.
6. Densmore, A. and J. Huang, "Microstrip Yagi antenna for mobile satellite service," IEEE Antennas and Propagation Society Int. Symp., Vol. 2, 616-619, Jun. 1991.
7. Zhang, X. C., J. G. Liang, and J. W. Xie, "The Quasi-Yagi antenna subarrat fed by an orthogonal T junction," Progress In Electromagnetics Research Letters, Vol. 4, 109-112, 2008. doi:10.2528/PIERL08050711
8. Chen, C. A. and D. K. Cheng, "Optimum element lengths for Yagi-Uda arrays," IEEE Trans. Antennas and Propagation, Vol. 23, Jan. 1975.
9. Lee, K. F., et al., "Microstrip antenna array with parasitic elements," IEEE Antennas and Propagation Society Symposium Dig., 794-797, Jun. 1987.
10. Haneishi, M., et al., "Beam-shaping of microstrip antenna by parasitic elements having coaxial stub," Trans. IECE of Japan, Vol. 69-B, 1160-1161, 1986.
11. Huang, J., "Planar microstrip Yagi array antenna," IEEE Antennas and Propagation Society Int. Symp., Vol. 2, 894-897, Jun. 1989.
12. Gray, D., J. Lu, and D. Thiel, "Electronically steerable Yagi-Uda microstrip patch antenna array," IEEE Trans. Antennas and Propagation, Vol. 46, No. 5, 605-608, May 1998. doi:10.1109/8.668900
13. Padhi, S. and M. Bialkowski, "Investigations of an aperture coupled microstrip Yagi antenna using PBG structure," IEEE Antennas and Propagation Society Int. Symp., Vol. 3, 752-755, Jun. 2002.
14. Yablonovitch, E., "Photonic band-gap structures," Journal of Optical Society of America B, Vol. 10, 283-295, 1993. doi:10.1364/JOSAB.10.000283
15. Yang, F., K. Mu, Y. Quin, and T. Itoh, "A unipolar photonic bandgap (UC-PBG) structure and its applications for microwave circuits," IEEE Trans. Microwave Theory Technique, Vol. 47, 1509-1514, Aug. 1999. doi:10.1109/22.780402
16. Fu, Y. Q., G. H. Zhang, and N. C. Yuan, "A novel PBG coplanar waveguide," IEEE Microwave and Wireless Components Letters, Vol. 11, Nov. 2001.
17. Gonzalo, R., P. D. Maagt, and M. Sorolla, "Enhanced patch-antenna performance by suppressing surface waves by using photonic bandgap substrates," IEEE Trans. Microwave Theory and Techniques, Vol. 47, 2131-2139, Nov. 1999. doi:10.1109/22.798009
18. DeJean, G. R. and M. M. Tentzeris, "A new high-gain microstrip Yagi array antenna with a high front-to-back (F/B) ratio for WLAN and millimeter-wave applications," IEEE Trans. Antennas and Propagation, Vol. 55, Feb. 2007.
19. HFSS: High frequency structure simulator based on the finiteElement method, v. 9.2.1, , Ansoft Corporation, 2004.
20. CST GmbH 2008 CST MICROWAVE STUDIO(r) User Manual V. 5.0, Darmstadt, , Germany (www.cst.de).