Wheel-shaped miniature assembly of circularly polarized wideband microstrip antenna for 5G mmWave terminals

• Main Authors: Kamal, Shahanawaz, Bin Ain, Mohd Fadzil, Ullah, Ubaid, Mohammed, Abdullahi S. B., Najmi, Fathul, Hussin, Roslina, Ahmad, Zainal Arifin, Omar, Mohamad Faiz Bin Mohamed, Ab Rahman, Mohd Fariz, Mahmud, Mohd Nazri, Othman, Mohamadariff
• Format: Article
• Published: ELSEVIER 2021
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.um.edu.my/34434/

A simple arrangement of wheel-shaped copper microstrip antenna is presented for operation in the 24 GHz frequency band. In this structure, a coaxial feed probe was utilized to generate vertical polarization, and a wheel-shaped microstrip with four coupling arms was used to produce horizontal polarization. An antenna comprising of two copper sheets assembled between the air substrate was manufactured and characterized experimentally. The measured and simulated values are in close compliance with each other. A stable in-band omnidirectional radiation patterns were achieved thereby ensuring a proper combination of the field vectors from the feed probe and the radiating arms. The antenna occupied an overall footprint of 8 mm to fruitfully realize -10 dB impedance bandwidth 3 GHz and radiation efficiency of similar to 100%. In the operating frequency band from 22.5 to 25.7 GHz, axial ratio <2.7 dB, gain <6 dBic and specific absorption rate (SAR) <0.06 W/kg was maintained. Furthermore, the integration of simple geometry and air-substrate significantly reduced the fabrication cost of the antenna system. Hence, the antenna is a promising candidate for 5G millimeter (mmWave) wireless communications. (C) 2021 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University.