Ground Radiation MIMO Antenna for Smartwatch Applications

Abstract

Large size antennas for smartwatches have lots of disadvantages like mechanical complexity, low flexibility, and less adaptability with small designs coming into the market as antenna design has become more competitive. That is why ground radiation MIMO antennas are promoted to overcome these problems. Several antenna types are used to carry out this technology, the most notable of which are loop-shaped antennas, which are quite lightweight, inexpensive, low profile, and most importantly simple to fabricate. For smartwatch communication, various ground-based radiation antennas are proposed. To achieve greater efficiency with limited space available to mount the antenna in the smartwatch, the design is developed for Ground Radiation based smartwatch antennas that can be used for Wi-Fi and Bluetooth bands. Ground radiation MIMO antenna for smartwatch applications antenna with Bezel is proposed with the 2x2 MIMO element. The antenna is embedded on the ground with two loop-shaped antennas placed orthogonal to each other on a P.C.B. Loop type isolator is installed between antenna elements that are attached externally to the ground plane. The operating frequency is 2.45 GHz. This provides a gain greater than 3 dB and a return loss of -19 dB. Furthermore, the antenna is tested for human radiations by keeping in view the international standards of SAR.