Four‐radiator ultra‐wideband multiple‐input multiple‐output antenna with high performance and dual‐band rejection features for high‐speed communications

Abstract

We are discussing a compact, four elements with high-performance ultrawideband (UWB) multiple-input multiple-output (MIMO) antenna with dual band-notched traits. The antenna has a partial ground plane and the radiator has truncation to enhance the matching through the frequency range 2.5-12 GHz. The coupling between ports was reduced by assorting the elements of the antenna in an orthogonal manner and applying four stubs between them.The proposed antenna achieves two band-notched characteristics by introducing a T-shaped strip etched in the radiating elements and adding an open-loop resonator near the feeding line. The results, which were simulated and measured, indicate that the proposed design achieved a wideband from 2.5 to 12 GHz with two band-notched characteristics within 3.3-3.6 GHz (WiMAX implementations) and within 5.2-5.8 GHz (Wireless Local Area Network [WLAN] applications). As well as, the proposed antenna has high isolation >20 dB and a low-envelope correlation coefficient <0.005 through the band except for the band notches. These outcomes demonstrate the adequacy of the proposed UWB MIMO antenna for UWB MIMO applications.band notch, high isolation, MIMO antenna, UWB antenna | INTRODUCTIONUltra-wideband (UWB) technology plays an essential role in modern wireless communication systems and is attractive following the Federal Communications Commission (FCC) approval on frequency bands with no license. 1 UWB systems have many benefits, for example, low price, increasing the data rate, high security, and low power. The antenna is the main element in the UWB system; so many efforts are made to design the optimal UWB antenna. 2,3 But UWB technology faces a multipath problem. Therefore, the multiple-input multiple-output (MIMO) antenna is used as a solution.MIMO technology is used for increasing system capacity without increasing power and quality. [4][5][6][7] There are challenges in designing the MIMO antenna. The main challenges in the design are how to design the MIMO antenna with a compact size, low correlation, an increased number of elements in the antenna to improve the link data rate, and high isolation to be used in portable devices. To increase the isolation in the system, there should be a distance between the antenna elements, and this increases the antenna size; there are various techniques used for improving the system's isolation.

Three‐element ultrawideband MIMO antenna based on shared‐radiator structures with high efficiency and gain

“…There are only a limited number of research papers on UWB MIMO antennas that incorporate more than two elements. A planar fourelement UWB-MIMO antenna system is presented in previous works, [21][22][23][24][25][26][27][28][29] with four antennas placed orthogonal to its adjacent elements. The utilization of orthogonal placement of antenna elements is an effective way to achieve good isolation between the elements.…”