volume | PIER Journals

Abstract

Two dual-band microstrip antennas with filtering responses are proposed in this letter. By introducing symmetrical slots (One is a U-shaped slot, and the other is an inverted H-shaped slot) at the edge of rectangle patches, additional resonant modes are induced, and both of the antennas have dual operation bands. More importantly, extra radiation nulls are observed between the two bands. In addition, the proposed antennas are fed by microstrip lines with two pairs of symmetrical open stubs, which offer two more radiation nulls at low frequencies. Thus, dual-band filtering responses for the proposed antennas are obtained. Simulated and measured results show good agreements with unidirectional radiation patterns, as well as high selectivity of realized gains.

1. Khan, M. S., M. F. Shafique, A. Naqvi, et al. "A miniaturized dual-band MIMO antenna for WLAN applications," IEEE Antennas and Wireless Propagation Letters, Vol. 14, 958-961, 2015.
doi:10.1109/LAWP.2014.2387701 Google Scholar

2. Feng, D., H. Zhai, L. Xi, et al. "A new filter antenna using improved stepped impedance hairpin resonator," Microwave and Optical Technology Letters, Vol. 59, 2934-2938, 2017.
doi:10.1002/mop.30847 Google Scholar

3. Yao, Y., Z. H. Tu, and Z. Gan, "An integration of dual-band filtering antenna for WLAN application," IEEE International Conference on Ubiquitous Wireless Broadband, IEEE, 2016. Google Scholar

4. Mao, C. X., S. Gao, Y. Wang, et al. "Compact highly integrated planar duplex antenna for wireless communications," IEEE Transactions on Microwave Theory and Techniques, 1-8, 2016. Google Scholar

5. Sahoo, A. K., R. D. Gupta, and M. S. Parihar, "Highly selective integrated filter antenna for UWB application," Microwave and Optical Technology Letters, Vol. 59, 1032-1037, 2017.
doi:10.1002/mop.30449 Google Scholar

6. Mao, C. X., S. Gao, Y. Wang, et al. "Dual-band patch antenna with filtering performance and harmonic suppression," IEEE Transactions on Antennas & Propagation, Vol. 64, 4074-4077, 2016.
doi:10.1109/TAP.2016.2574883 Google Scholar

7. Mansour, G., M. J. Lancaster, P. S. Hall, P. Gardner, and E. Nugoolcharoenlap, "Design of filtering microstrip antenna using filter synthesis approach," Progress In Electromagnetics Research, Vol. 145, 59-67, 2014.
doi:10.2528/PIER14011405 Google Scholar

8. Ogbodo, E. A., M. G. Aly, A. E. Ali, Y. Wu, and Y. Wang, "Dual-band filtering antenna using dual-mode patch resonators," Microwave and Optical Technology Letters, Vol. 60, 2564-2569, 2018. Google Scholar

9. Zhang, X. Y., W. Duan, and Y. M. Pan, "High-gain filtering patch antenna without extra circuit," IEEE Transactions on Antennas & Propagation, Vol. 63, 5883-5888, 2017.
doi:10.1109/TAP.2015.2481484 Google Scholar

10. Lin, C. K. and S. J. Chung, "A compact filtering microstrip antenna with quasi-elliptic broadside antenna gain response," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 381-384, 2011.
doi:10.1109/LAWP.2011.2147750 Google Scholar

11. Zhang, X. Y., Y. Zhang, Y. M. Pan, et al. "Low-profile dual-band filtering patch antenna and its application to LTE MIMO system," IEEE Transactions on Antennas & Propagation, Vol. 65, 103-113, 2017.
doi:10.1109/TAP.2016.2631218 Google Scholar

Dr. Jianfang Deng

Dr. Lanping Feng