Compact Wideband Internal Antenna for Sub-6GHz 5G Radios

This paper presents an approach of very compact planar antenna design for integration in 5G mobile phone and laptops. The antenna is designed to cover 5G sub-6GHz high frequency bands. The bands start from 1710 MHz to 6 GHz, it includes LTE high bands, NR and LAA. The antenna design approach and analysis is explained in this study. The impact of feed position, gap between antenna and ground to achieve wider frequency bandwidth is described. The antenna is embedded in the top left corner of the laptop lid to make the study more practical. The lid contains display glass, metal chassis and plastic back cover. The antenna is designed and explained using CST EM-simulator and it has been prototyped and measured. Return loss and efficiency of the antenna is simulated and measured. The FR4 substrate and it requires only 28mmx8mm area including gap from the ground. It shows better than 6dB returnloss and >40% efficiency over the band starts from 1710MHz to 6GHz. The antenna is well suited for sub-6GHz, 5G high bands for 4x4 MIMO operations.