Low-Profile, Multiband & Wideband ‘C-Shaped’ Monopole Antenna for 5G and WLAN Applications

A novel, very low profile, multi band and wide band monopole antenna for fifth generation wireless (5G) and Wireless LAN (WLAN) applications is proposed. The footprint of antenna is only 20mm x 15mm and is designed using economical FR-4 substrate of thickness 0.8mm. The compact structure of the proposed antenna composed of two "C-shaped" radiators pointing towards each other along with loading of circular radiator at each corner of C-shaped radiator and a rectangular tuning stub. The complete structure is fed by 50Ω microstrip line resulting in two resonances at 3.9GHz and 6.6GHz. The two resonances achieve 6 dB impedance bandwidth of 76% (3.30-7.35) GHz. The proposed antenna also exhibits a stable gain of around 2.25dBi, efficiency of around 85% and approximately omnidirectional radiation patterns in the functioning bands of interest. Therefore, because of good radiation characteristics, compact in size, and economical and simple in design, the proposed antenna is a good candidate for 5G and WLAN applications.