Design of a compact UWB-MIMO antenna with high isolation and dual band-notched characteristics

Abstract

A compact UWB-MIMO antenna with dual band-notched behaviors is proposed. The bending and E-shaped meander structures are introduced to broaden the bandwidth. Two circular patches are placed orthogonally and dual U-shaped branches are added for reducing the mutual couplings. Dual notches are achieved by embedding two L-shaped slots in the elements. The simulated and measured results show that the antenna has the wider impedance bandwidths of 2.68–12.50 GHz (Element 1) and 2.82–11.20 GHz (Element 2) except two notched bands. The notched bands of 5.12–5.81 GHz and 7.06–8.03 GHz are achieved for the element 1. The notched bands of 5.08–5.83 GHz and 7.02–7.98 GHz are achieved for the element 2. These notched bands accurately cover the WLAN band and X-band. Furthermore, the antenna obtains higher isolation, smaller envelope correlation coefficient, higher radiating efficiency, acceptable peak realized gain, and stable radiation patterns. Therefore, the antenna is suitable for building the UWB-MIMO communication systems with good performance.

KEYWORDS:

• UWB-MIMO antenna
• improved ground structure
• stepped feeding line
• high isolation
• dual band-notched characteristics

Additional information

Notes on contributors

Zhijun Tang

Zhijun Tang received his PhD degree in electrical engineering at Hunan University in 2010. His main research interests are UWB/MIMO antenna design, RFID electromagnetic modeling and antenna design.

Jie Zhan

Jie Zhan received his PhD degree in electronics at Hunan University in 2011. His main research interests are wireless communication technology.

Xiaofeng Wu

Xiaofeng Wu received his PhD degree in microelectronics at Xidian University in 2010. His main research interests are design and optimization of high power microwave power amplifiers.

Zaifang Xi

Zaifang Xi received his Master’s Degree from the Hunan University in 2003. His current research interests include signal processing and communication system.

Long Chen

Long Chen received his PhD degree in communication engineering at Fudan University in 2017. His current research interests include optical fiber communication technology and system.

Shigang Hu

Shigang Hu received his PhD degree in microelectronics at Xidian University in 2009. His current research interests include analog IC design and semiconductor devices.