A compact 4-port asymmetric coplanar strip (ACS)-fed MIMO antenna working in the ultra-wideband (UWB) frequency band with two shared radiators is presented in this paper. The proposed antenna is composed of two radiators, and each radiator is shared by two antenna elements in order to achieve a very compact size of 36×36 mm2. By etching two I-shaped slots in the radiators and attaching a rectangular patch on the back, the operating band width is broadened, and the isolation between any two antenna elements is enhanced. The stub of the ground also has great effect on the return loss and isolation. The working frequency band of the MIMO antenna covers 3.1-10.6 GHz with isolation over 15 dB between any two antenna elements. Furthermore, the proposed antenna with a simple feeding structure and compact size makes it possible to be used in portable devices.
2. Liu, L. and W. Cheung, "Compact MIMO antenna for portable devices in UWB applications," IEEE Trans. Antennas Propag., Vol. 61, 4257-4264, 2013.
doi:10.1109/TAP.2013.2263277
3. Yang, L.-S. and T. Li, "Box-folded four-element MIMO antenna system for LTE handsets," Electron. Lett., Vol. 51, 440-441, 2015.
doi:10.1049/el.2014.3757
4. Li, J.-F. and C.-X. Qin, "Compact dual band-notched UWB MIMO antenna with high isolation," IEEE Trans. Antennas Propag., Vol. 61, 4759-4766, 2013.
doi:10.1109/TAP.2013.2267653
5. Li, J.-F. and Q.-X. Chu, "A compact wideband MIMO antenna with two novel bent slits," IEEE Trans. Antennas Propag., Vol. 60, 482-489, 2012.
doi:10.1109/TAP.2011.2173452
6. Zhang, S. and B.-K. Lau, "Closely-packed UWB MIMO/diversity antenna with different patterns and polarizations for USB dongle applications," IEEE Trans. Antennas Propag., Vol. 60, 4372-4380, 2012.
doi:10.1109/TAP.2012.2207049
7. Li, Q. and A.-P. Feresidis, "Miniaturized double-layer EBG structures for broadband mutual coupling reduction between UWB monopoles," IEEE Trans. Antennas Propag., Vol. 63, 1168-1171, 2015.
doi:10.1109/TAP.2014.2387871
8. Gao, P. and S. He, "Compact printed UWB diversity slot antenna with 5.5GHz band-notched characteristics," IEEE Antennas Wirel. Propag. Lett., Vol. 13, 376-379, 2014.
doi:10.1109/LAWP.2014.2305772
9. Ren, J. and W. Hu, "Compact printed MIMO antenna for UWB applications," IEEE Antennas Wirel. Propag. Lett., Vol. 13, 1517-1520, 2014.
doi:10.1109/LAWP.2014.2343454
10. Chen, L., Y.-F. Liu, and X.-L. Ma, "Compact ACS-fed circular-ARC-shaped stepped monopole antenna for tri-band WLAN/WiMAX applications," Progress In Electromagnetics Research C, Vol. 51, 131-137, 2014.
doi:10.2528/PIERC14051206
11. Liu, Y.-F. and P. Wang, "Compact ACS-fed UWB antenna for diversity applications," Electron. Lett., Vol. 50, 1336-1338, 2014.
doi:10.1049/el.2014.1678
Submit
