By combining a horizontal bowtie electric dipole and a vertical rhombic loop antenna which is realized by a pair of folded shorted patches, a very wideband dipole-loop composite patch antenna is designed. Four tuning stubs are attached to the edges of the bowtie dipole to improve the impedance matching. The bowtie dipole and the rhombic loop antenna are excited simultaneously by a simple feed structure which not only forms a folded balun but also makes the antenna itself be direct current grounded. Results show that a wide impedance bandwidth of 121.6% for |S11|<-10 dB from 3.5 to 14.35 GHz is obtained. Good radiation patterns, low back radiation, low cross polarization level, and a peak antenna gain of 7.7 to 9.8 dBi are achieved over the operating bands.
2. Wu, X. T., W. J. Lu, J. Xu, K. F. Tong, and H. B. Zhu, "Loop-monopole composite antenna for dual-band wireless communications," IEEE Antennas Wireless Propag. Lett., Vol. 14, 293-296, 2015.
doi:10.1109/LAWP.2014.2363667
3. Luk, K. M. and H. Wong, "A complementary wideband antenna," US Patent, No. 11/373, Mar. 2006.
4. An, W. X., K. L. Lau, S. F. Li, and Q. Xue, "Wideband E-shaped dipole antenna with staircase-shaped feeding strip," Electron. Lett., Vol. 46, No. 24, 1583-1584, Nov. 2010.
doi:10.1049/el.2010.2890
5. Ge, L. and K. M. Luk, "A magneto-electric dipole antenna with low-profile and simple structure," IEEE Antennas Wireless Propag. Lett., Vol. 12, 140-142, 2013.
doi:10.1109/LAWP.2013.2244054
6. He, K., S. X. Gong, and F. Gao, "Low profile wideband unidirectional patch antenna with improved feed structure," Electron. Lett., Vol. 51, No. 4, 317-319, Apr. 2015.
doi:10.1049/el.2014.4309
7. Zhang, Z. Y., G. Fu, S. L. Zuo, and S. X. Gong, "Wideband unidirectional patch antenna with Γ-shaped strip feed," Electron. Lett., Vol. 46, No. 1, 24-26, Jan. 2010.
doi:10.1049/el.2010.2825
8. Ge, L. and K. M. Luk, "A wideband magneto-electric dipole antenna," IEEE Trans. Antennas Propag., Vol. 60, No. 11, 4987-4991, Nov. 2012.
doi:10.1109/TAP.2012.2207689
9. He, K., S. X. Gong, and F. Gao, "A wideband dual-band magneto-electric dipole antenna with improved feeding structure," IEEE Antennas Wireless Propag., Vol. 13, 1729-1732, 2014.
doi:10.1109/LAWP.2014.2353792
10. Ge, L. and K. M. Luk, "A simple low-profile magneto-electric dipole antenna element," IEEE International Wireless Symposium, 1-3, 2013.
11. Ge, L. and K. M. Luk, "A low-profile magneto-electric dipole antenna," IEEE Trans. Antennas Propag., Vol. 60, No. 4, 1684-1689, Apr. 2012.
doi:10.1109/TAP.2012.2186260
12. Luk, K. M. and B. Q. Wu, "The magnetoelectric dipole — A wideband antenna for base stations in mobile communications," Proceedings of the IEEE, Vol. 100, No. 7, 2297-2307, Jul. 2012.
Submit
