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

Summary We are discussing a compact, four elements with high‐performance ultra‐wideband (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.