volume | PIER Journals

Abstract

A wideband planar inverted-F MIMO antenna with high isolation is proposed in this letter. The proposed MIMO antenna consists of two back-to-back planar inverted-F antennas and a fork-shaped de-coupling stub. The two planar inverted-F antennas are merged together with a shorting strip connected to the ground plane. In order to enhance the isolation, a fork-shaped decoupling stub connected to the ground plane through shorting pins is introduced, and the impedance matching is significantly improved simulta-neously. The proposed antenna prototype is fabricated and measured, and a compact size of 28×26 mm² makes the proposed antenna be easily integrated in a MIMO system. Measured results show that the measured bandwidth for |S₁₁| less than -10 dB covers from 5.05 GHz to 6.23 GHz, and the measured isolation is higher than 20 dB in the whole working frequency band.

1. Murch, R. D. and K. B. Letaief, "Antenna systems for broadband wireless access," IEEE Commun. Mag., Vol. 40, No. 4, 76-83, Apr. 2002.
doi:10.1109/35.995854

2. Lee, C. H., S. Y. Chen, and P. W. Hsu, "Intergrated dual planar inverted-F antenna with enhanced isolation," IEEE Antennas Wireless Propag. Lett., Vol. 8, 963-965, 2009.

3. Lai, X. Z., Z. M. Xie, X. L. Cen, and Z. Y. Zheng, "A novel technique for broadband circular polarized PIFA and diversity PIFA systems," Progress In Electromagnetics Research, Vol. 142, 41-55, 2013.
doi:10.2528/PIER13070405

4. Wong, K. L., C. H. Chang, B. Chen, and S. Yang, "Three-antenna MIMO system for WLAN operation in a PDA phone," Microw. Opt. Technol. Lett., Vol. 48, 1238-1242, 2006.
doi:10.1002/mop.21665

5. Ling, X. M. and R. L. Li, "A novel dual-band MIMO antenna array with low mutual coupling for portable wireless devices," IEEE Antennas Wireless Propag. Lett., Vol. 10, 1039-1042, 2011.
doi:10.1109/LAWP.2011.2169035

6. Sonkki, M. and E. Salonen, "Low mutual coupling between monopole antennas by using two λ/2 slots," IEEE Antennas Wireless Propag. Lett., Vol. 9, 138-141, 2010.
doi:10.1109/LAWP.2010.2044476

7. Chiu, C. Y., C. H. Cheng, R. D. Murch, and C. R. Rowell, "Reduction of mutual coupling between closely-packed antenna elements," IEEE Trans. Antennas Propag., Vol. 55, No. 6, 1732-1738, Jun. 2007.
doi:10.1109/TAP.2007.898618

8. Zhang, S., Z. Ying, J. Xiong, and S. He, "Ultrawideband MIMO/diversity antennas with a tree-like structure to enhance wideband isolation," IEEE Antennas Wireless Propag. Lett., Vol. 8, 1279-1282, 2009.
doi:10.1109/LAWP.2009.2037027

9. Xie, J. J., Y. Z. Yin, J. H. Wang, and X. L. Liu, "Wideband dual-polarised electromagnetic-fed patch antenna with high isolation and low cross-polarisation," Electron. Lett., Vol. 49, No. 3, 171-173, 2013.
doi:10.1049/el.2012.3934

10. Wong, K. L. and T. W. Chiou, "Broad-band dual-polarized patch antennas fed by capacitively coupled feed and slot-coupled feed," IEEE Trans. Antennas Propag., Vol. 50, No. 3, 346-351, Mar. 2002.
doi:10.1109/8.999625

11. Chiou, T. W. and K. L. Wong, "Broad-band dual-polarized single microstrip patch antenna with high isolation and low cross polarization," IEEE Trans. Antennas Propag., Vol. 50, No. 3, 399-401, Mar. 2002.
doi:10.1109/8.999635

12. Blanch, S., J. Romeu, and I. Corbella, "Exact representation of antenna system diversity performance from input parameter description," Electron. Lett., Vol. 39, No. 9, 705-707, May 2003.
doi:10.1049/el:20030495

Dr. Zhaoyang Tang

Dr. Bo Wang

Professor Ying-Zeng Yin

Dr. Ruina Lian