Miniaturized Dual-Band Antenna for GSM1800, WLAN, and Sub-6 GHz 5G Portable Mobile Devices

Miniature devices are becoming increasingly demanded as fifth-generation (5G) technology is been deployed. This has necessitated the need to miniaturize all the various components of 5G enabling systems. It is a well-known fact that without the antenna, there is no wireless communication as it forms the link between the space and the wired network. Hence, the miniaturization of the antenna will contribute to the miniaturization of the entire wireless system. In this work, a miniature dual-band ultracompact antenna based on an opened-B-shaped (OBS) patch, a partial ground, and a ground protruding stub is presented. The antenna size is 0.14 ×0.07λoλo@1.85GHz. The proposed antenna is etched on a rogers (RT5880) substrate and fed with a 50 Ω asymmetric microstrip feedline. The proposed OBS antenna is fabricated and measured. In addition, the equivalent circuit of the proposed OBS antenna is designed and analyzed using AWR®. The antenna operates at a center frequency of 1.85 GHz and 5.89 GHz with an impedance bandwidth of 10.41% and 36.29%, respectively, which means that the first and second bands are narrow and wide bands, respectively. Furthermore, the mean peak gain of the proposed OBS antenna at lower and upper bands are 4.1 dB and 3.95 dB, respectively. More so, the radiation pattern antenna shows a quasiomnidirectional at E-plane and omnidirectional at H-plane. There is a good agreement between simulated and measured results. Therefore, the proposed OBS antenna is a suitable candidate for future portable mobile devices.