Wheel-shaped miniature assembly of circularly polarized wideband microstrip antenna for 5G mmWave terminals
Abstract
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 ~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.
Author
Kamal, Shahanawaz
Bin Ain, Mohd Fadzil
Ullah, Ubaid
Mohammed, Abdullahi S.B.
Najmi, Fathul
Hussin, Roslina
Ahmad, Zainal Arifin
Bin Mohamed Omar, Mohamad Faiz
Ab Rahman, Mohd Fariz
Mahmud, Mohd Nazri
Othman, Mohamadariff