Compact Offset Microstrip-Fed MIMO Antenna for Band-Notched UWB Applications

• Published in: IEEE antennas and wireless propagation letters Vol. 14; pp. 1754 - 1757
• Main Authors: Kang, Le, Li, Hui, Wang, Xinhuai, Shi, Xiaowei
• Format: Journal Article
• Language: English
• Published: New York IEEE 2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna measurements; Antenna radiation patterns; Band-notched; Microstrip antennas; MIMO; multiple-input-multiple-output (MIMO) antenna; offset microstrip-fed; Ultra wideband antennas; ultrawideband (UWB) antenna; Wireless communication
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2015.2422571

A compact multiple-input-multiple-output (MIMO) antenna is presented for ultrawideband (UWB) applications with band-notched function. The proposed antenna is composed of two offset microstrip-fed antenna elements with UWB performance. To achieve high isolation and polarization diversity, the antenna elements are placed perpendicular to each other. A parasitic T-shaped strip between the radiating elements is employed as a decoupling structure to further suppress the mutual coupling. In addition, the notched band at 5.5 GHz is realized by etching a pair of L-shaped slits on the ground. The antenna prototype with a compact size of 38.5 × 38.5 mm 2 has been fabricated and measured. Experimental results show that the antenna has an impedance bandwidth of 3.08-11.8 GHz with reflection coefficient less than -10 dB, except the rejection band of 5.03-5.97 GHz. Besides, port isolation, envelope correlation coefficient and radiation characteristics are also investigated. The results indicate that the MIMO antenna is suitable for band-notched UWB applications.