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In this paper, a quad elements, differentially fed, dual polarized Ultra-Wideband Multiple-Input Multiple-Output (UWB-MIMO) antenna system is presented. The unit UWB antenna element is of compact size with the dimensions of 22×24 mm 2 . The proposed MIMO antenna structure consists of two pairs of dual polarized rectangular shape UWB monopole antennas. A simple decoupling structure (DS) comprising of rectangular stubs is optimized with several full wave simulations to improve the isolation among the antennas. The proposed MIMO system exhibits reflection coefficient whose value is less than -10 dB from 4.5 GHz -11.5 GHz. Different important parameters such as radiation characters, time domain received signals from each antenna element, electric field distribution, envelop correlation coefficient and diversity gain are calculated, analyzed and compared. The diversity antenna system with decoupling structure has shown a significant better performance compared to the system without decoupling structure. Keywords: differentially fed, multiple input and multiple output, quad elements, ultra-wideband.I.

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‫اإلصابة‬ ‫كان‬ ‫بينما‬ .)0%( ET ‫من‬ )2.3%( ‫اجلراحية‬ ‫السدادة‬ ‫تقنية‬ ‫عند‬ ‫إحصائي‬ ‫فرق‬ ‫يظهر‬ ‫لم‬ ‫ولكن‬ ،SPT ‫من‬ )0.9%( ET ‫عند‬ ‫أكثر‬ ‫بالعدوى‬ .)p=0.064( ‫مهم‬ ‫املرتبطة‬ ‫املضاعفات‬ ‫حيث‬ ‫من‬ SPT ‫و‬ ET ‫بني‬ ‫كبير‬ ‫فرق‬ ‫يوجد‬ ‫ال‬ ‫اخلالصة:‬ ‫املنفذ.‬ ‫مبوقع‬ Objectives: To compares the endoclose technique (ET) techniques and surgicel plug technique (SPT) in terms of port-site related complications. Minimally invasive surgeries (MIS) are widely performed nowadays, nonetheless, port-site closure technique plays a role in the prevention of port-site related complications. Methods: This retrospective study was carried out at general surgery and urology departments of King Fahad Medical City, Saudi Arabia. Variables that were collected include age, gender, height, weight, body mass index, co-morbidities, type and date of surgery, Original Articleintraoperative visceral injury or bleeding, technique cost, and port-site post-operative complications (hernia, infection, bleeding, dehiscence, and hypertrophic scarring). Data was collected from electronic medical records. Patients included are whom underwent any minimally invasive procedure from the beginning of 2014 until the end of September 2020. Follow up period was at least for 2 years. Results:We analyzed 397 patients. Surgicel plug technique was more of having hernia (2.3%) than of ET (0%). While ET was more on infection (0.9%) than in SPT, but no significant difference being observed (p=0.064). Conclusion:There is no significant difference between the ET and the novel SPT in terms of port-site related complications.