Investigations on a compact self‐isolated flag‐shaped slotted MIMO antenna for triple‐band applications

Summary A compact flag‐shaped slotted multiple input multiple output (MIMO) antenna is deliberated in the article for triple‐band applications. The flag‐shaped slotted antenna is built with the help of four radiating patches having rectangular slots and disconnected ground structures. The suggested flag‐shaped slotted antenna can operate in the key frequencies of 2.4, 3.5, and 5 GHz. The antenna elements are oriented orthogonally with each other, such that no external decoupling structures are required to provide isolation. The complete size of the four‐element MIMO is 30*30*1.6 mm3. The minimum isolation between the four flag‐shaped slotted elements is −61, −55, and −47 dB in the operating frequency band of 2.3–2.8 GHz, 3.4–3.9 GHz, and 4.5–5.6 GHz, respectively. The simulated and measured results agree with each other, and they have stable radiation and gain. The MIMO performance parameters are measured, and it is noticed that the envelope correlation coefficient is lower than 0.04 and the diversity gain is 9.99 dB in the considered working frequency bands. The proposed flag‐shaped slotted MIMO is appropriate for WLAN, 5G sub‐6 GHz, and ISM wireless applications. A compact flag‐shaped slotted multiple input multiple output antenna (MIMO) is deliberated in the article. It is built with the help of four radiating patches having rectangular slots and disconnected ground structures. The 4×4 MIMO antenna is compact and its size is 30*30*1.6 mm3. The MIMO antenna provides excellent isolation without the need for any external decoupling structures. The minimum isolation is −61dB, −55dB, and −47dB at operating bands 2.3–2.8 GHz, 3.4–3.9 GHz, and 4.5–5.6 GHz respectively.