A wideband planar printed quasi-Yagi antenna with band-notched characteristic is presented. The proposed antenna consists of a microstrip-to-slotline transition structure, a gradient driver dipole, and two parasitic strips as directors. Meanwhile, the arms of the driver and two directors are rotated in a certain angle to improve gain. Employing a microstrip-to-slotline transition, a driver dipole and two parasitic strips, the proposed antenna achieves a wide bandwidth for ultra-wideband applications. The driver dipole is connected to the slotline with a coplanar stripline. To avoid the frequency interference from WLAN operating in the frequency band from 5.15 GHz to 5.825 GHz, an L-shape slot etched on the driver dipole element is adopted to achieve notched band ranging from 4.8 GHz to 6.1 GHz. The ground plane is symmetrically added two stubs to implement the lateral size reduction. The measured bandwidth, determined by the reflection coefficient less than -10 dB, covers from 3 GHz to 10.8 GHz. Better than 8.1 dB F/B ratio and the measured antenna gain varying between 4.7 and 8.3 dBi are also achieved in the operating bandwidth excepting in the notched band.
2. Huang, J. and A. C. Densmore, "Microstrip Yagi array antenna for mobile satellite vehicle application," IEEE Trans. Antennas Propag., Vol. 39, No. 7, 1024-1030, Jul. 1991.
3. Rashidian, A., L. Shafai, and D. M. Klymyshyn, "Compact wideband multimode dielectric resonator antennas fed with parallel standing strips," IEEE Trans. Antennas Propag., Vol. 60, No. 11, 5021-5031, Nov. 2012.
4. Kan, H., R. Waterhouse, A. Abbosh, and M. Bialkowski, "Simple broadband planar CPW-fed quasi-Yagi antenna," IEEE Antennas Wireless Propagt. Lett., Vol. 6, 18-20, Jul. 2007.
5. Wang, H., S.-F. Liu, W.-T. Li, and X.-W. Shi, "Design of a wideband planar microstrip-fed quasi-Yagi antenna," Progress In Electromagnetics Research Letters, Vol. 46, 19-24, 2014.
6. Jiang, K., Q. G. Guo, and K. M. Huang, "Design of a wideband quasi-Yagi microstrip antenna with bowtie active elements," Int. Conf. on Microwave and Millimeter Wave Technology, 1122-1124, May 2010.
7. Han, K., Y. Park, H. Choo, and I. Park, "Broadband CPS-fed Yagi-Uda antenna," Electron. Lett., Vol. 45, No. 24, 1207-1209, Nov. 2009.
8. Woo, D., Y. Kim, W. Kim, and Y. Cho, "Design of quasi-Yagi antennas using an ultra-wideband balun," Microwave Opt. Technol. Lett., Vol. 50, No. 8, 2068-2071, Aug. 2008.
9. Deal, W. R., N. Kaneda, J. Sor, Y. Qian, and T. Itoh, "A new quasi-Yagi antenna for planar active antenna arrays," IEEE Trans. Microw. Theory Tech., Vol. 48, No. 6, 910-918, Jun. 2000.
10. Rakluea, P. and J. Nakasuwan, "Planar UWB antenna with single band-notched characteristic," Int. Conf. on Control, Automation and Systems, 1978-1981, 2010.
11. Zamel, H. M., A. M. Attiya, and E. A. Hashish, "Design of a compact UWB planar antenna with band-notch characterization," National Radio Science Conference, 1-8, 2007.
12. Fallahi, R., A.-A. Kalteh, and M. G. Roozbahani, "A novel UWB elliptical slot antenna with band-notched characteristics," Progress In Electromagnetics Research, Vol. 82, 127-136, 2008.
13. Medeiros, C. R., J. R. Costa, and C. A. Fernandes, "UWB crossed exponentially tapered slot antenna with WLAN band rejection," IEEE Antennas and Propagation Society International Symposium, 1-4, 2009.
14. Wu, J., Z. Zhao, Z. Nie, and Q.-H. Liu, "Bandwidth enhancement of a planar printed quasi-Yagi antenna with size reduction," IEEE Trans. Antennas Propag., Vol. 62, No. 1, 463-467, Jan. 2014.