volume | PIER Journals

Abstract

A compact bandpass filtering antenna operating at 5.1 GHz is introduced. The radiation layer makes up of a U-shaped patch and a trident resonator. The U-shaped patch is both the antenna and the last stage of the filter, which is excited by the insertion coupling part of the trident resonator. To improve the impedance matching and lower stopband suppression, a defective ground structure (DGS) is used. The dimension of the antenna is 0.36λ₀×0.36λ₀×0.01λ₀ (λ₀ is the wavelength at 5.1 GHz) without a complex external feed structure, which has enough bandwidth, a good frequency skirt selectivity, and a flat passband response. The measurement results manifest that the impedance bandwidth is 110 MHz, and the peak gain is 3.88 dBi. In addition, the filtering antenna also has a sharp roll-off rate and a satisfactory level of out-of-band suppression in the stopband.

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

2. Yao, Y., Z.-H. Tu, and Z. Gan, "A triband monopole filtering antenna using multimode resonators," Microw. Opt. Technol. Lett., Vol. 59, 1908-1913, 2017, https://doi.org/10.1002/mop.30638.
doi:10.1002/mop.30638 Google Scholar

3. Li, Y., Z. Zhao, Z. Tang, and Y. Yin, "Differentially fed, dual-band dual-polarized filtering antenna with high selectivity for 5G sub-6 GHz base station applications," IEEE Trans. Antennas Propag., Vol. 68, No. 4, 3231-3236, Apr. 2020, doi: 10.1109/TAP.2019.2957720.
doi:10.1109/TAP.2019.2957720 Google Scholar

4. Liang, T., Y. Dong, Z.Wang, X. Chen, and H.Wang, "Quasi-reflectionless tunable filtering antenna for multicarrier transceiver," IEEE Antennas Wireless Propag. Lett., Vol. 20, No. 6, 1053-1057, Jun. 2021, doi: 10.1109/LAWP.2021.3070806.
doi:10.1109/LAWP.2021.3070806 Google Scholar

5. Zhang, Y., X. Y. Zhang, L. Gao, Y. Gao, and Q. H. Liu, "A two-port microwave component with dual-polarized filtering antenna and single-band bandpass filter operations," IEEE Trans. Antennas Propag., Vol. 67, No. 8, 5590-5601, Aug. 2019, doi: 10.1109/TAP.2019.2913775.
doi:10.1109/TAP.2019.2913775 Google Scholar

6. Hu, P. F., Y. M. Pan, X. Y. Zhang, and S. Y. Zheng, "Broadband filtering dielectric resonator antenna with wide stopband," IEEE Trans. Antennas Propag., Vol. 65, No. 4, 2079-2084, Apr. 2017, doi: 10.1109/TAP.2017.2670438.
doi:10.1109/TAP.2017.2670438 Google Scholar

7. Pan, Y. M., P. F. Hu, X. Y. Zhang, and S. Y. Zheng, "A low-profile high-gain and wideband filtering antenna with metasurface," IEEE Trans. Antennas Propag., Vol. 64, No. 5, 2010-2016, May 2016, doi: 10.1109/TAP.2016.2535498.
doi:10.1109/TAP.2016.2535498 Google Scholar

8. Yang, W., S. Chen, Q. Xue, W. Che, G. Shen, and W. Feng, "Novel filtering method based on metasurface antenna and its application for wideband high-gain filtering antenna with low profile," IEEE Trans. Antennas Propag., Vol. 67, No. 3, 1535-1544, Mar. 2019, doi: 10.1109/TAP.2018.2889028.
doi:10.1109/TAP.2018.2889028 Google Scholar

9. Yang, W., et al. "A simple, compact filtering patch antenna based on mode analysis with wide out-of-band suppression," IEEE Trans. Antennas Propag., Vol. 67, No. 10, 6244-6253, Oct. 2019, doi: 10.1109/TAP.2019.2922770.
doi:10.1109/TAP.2019.2922770 Google Scholar

10. Zhang, X. Y., W. Duan, and Y. Pan, "High-gain filtering patch antenna without extra circuit," IEEE Trans. Antennas Propag., Vol. 63, No. 12, 5883-5888, Dec. 2015, doi: 10.1109/TAP.2015.2481484.
doi:10.1109/TAP.2015.2481484 Google Scholar

11. Li, L., S. Wu, D. Pang, X. Zhang, and Q. Wang, "A fifth-order single-layer dual-band half-mode SIW filtering antenna with a multifunctional single slot," IEEE Antennas Wireless Propag. Let, Vol. 20, No. 9, 1676-1680, Sept. 2021, doi: 10.1109/LAWP.2021.3093062.
doi:10.1109/LAWP.2021.3093062 Google Scholar

12. Liu, Q. and L. Zhu, "A low-profile dual-band filtering hybrid antenna with broadside radiation based on patch and SIW resonators," IEEE Open Journal of Antennas Propag., Vol. 2, 1132-1142, 2021, doi: 10.1109/OJAP.2021.3130208.
doi:10.1109/OJAP.2021.3130208 Google Scholar

13. Yang, W., et al. "A simple, compact filtering patch antenna based on mode analysis with wide out-of-band suppression," IEEE Trans. Antennas Propag., Vol. 67, No. 10, 6244-6253, Oct. 2019, doi: 10.1109/TAP.2019.2922770.
doi:10.1109/TAP.2019.2922770 Google Scholar

14., https://new.qq.com/rain/a/20210128A04INV00.
doi:10.1109/TAP.2019.2922770 Google Scholar

Dr. Hu Chang

Dr. Mengxin Liu

Dr. Daming Lin

Dr. Jie Wang