# Development of Wearable Textile MIMO Antenna for Sub-6 GHz Band New Radio 5G Applications
###### Abstract  
In this paper, an irregular octagonal two-port MIMO patch antenna is designed specifically for New Radio (NR) 5G applications in the mid-band sub-6 GHz. The proposed antenna comprises an irregularly shaped patch antenna equipped with a regular 50-ohm feed line and a parasitic strip line antenna, and is partially grounded. Jeans material serves as a substrate with an effective dielectric constant of 1.6 and a thickness of 1 mm. This material is studied experimentally. The proposed antenna design undergoes analysis and optimization using the ANSYS HFSS tool. Furthermore, the design incorporates the influence of the slot on both the ground plane and the parasitic strip line to optimize performance, enhance isolation, and improve impedance matching among antenna elements. The dimensions of the jeans substrate are 40 mm \(\times\) 50 mm. The simulated impedance bandwidth ranged from 3.6 GHz to 7 GHz and the measured bandwidth was slightly narrower, from 4.35 GHz to 7 GHz. The simulation results demonstrated an isolation level greater than 12 dB between antenna elements, while the measured results reached 28.5 dB, and the peak gain for this proposed antenna stood at 6.74 dB. These qualities made this proposed antenna suitable for various New Radio mid-band 5G wireless applications within the sub-6 GHz band, such as N79, Wi-Fi-5/6, V2X, and DSRC applications. MIMO; jeans; irregular octagon; return loss; substrate; HFSS +
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0000-0001-9150-788X][PERSON] 00000-0002-0002-319-2224][PERSON] 0000-0002-0002-319-2224][PERSON] 0000-0002-0002-319-2225-2225][PERSON] 00000-0002-0002-319-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2225-2222  
polyimide, and the radiating element is contained in a square plane. It comprises two robotic elements. Attaining a wide bandwidth is essential to overcoming potential performance limitations when using wearable technology on the body. We therefore created a MIMO antenna designed specifically for wearable devices which has both a large spectrum and low mutual interference; using jeans fabric as its base provides optimal efficiency and compatibility when wearing it. To improve the performance of antennas, two I-shaped structures were joined via adhesive copper sheets that were fixed on a dielectric substrate in the two patches [2]. Recently, a customized microstrip patch antenna specially designed for 5G was designed by using polyethylene terephthalate, and the thickness of the antenna substrate was 0.125 mm [3]. A novel technique was presented to create Global Positioning System (GPS) patch antennas by gluing adhesive copper tape directly onto jeans [4]. This research examined the development of wearable antennas which included dual-band (UWB) single-band (SC) and meta material variants for maximum efficiency [5]. As mentioned in [6], the forward-thinking approach to research led to the development of an ant-fabric MIMO antenna specifically designed to be workable [7]. In [8], the need for an effective MIMO solution with minimal mutual coupling between its constituent antenna elements was highlighted. In the literature, various papers have attempted to understand the function of wearable antennas under different conditions for various applications [9; 10; 11; 12; 13; 14; 15; 16]. In [17], a dual-band antenna was presented for 5G NR applications. SAR analysis for dual-band wearable antenna for WLAN was presented in [18]. In [19], wearable textile antennas utilizing ultra-wideband (UWB) technology were created to strengthen wireless body area networks for use with telemedicine and mobile health systems. In [20], an innovative textile multiple input multiple output (MIMO) antenna design inspired by reflective artificial surfaces (RIS) and electromagnetic band gap gaps (EBG) was introduced, made using viscose wool felt materials. This paper describes an irregular octagonal two-port MIMO patch antenna developed for use with 5G wireless applications in the sub-6 GHz band.