A Compact and Low-Profile MIMO Antenna Using a Miniature Circular High-Impedance Surface for Wearable Applications
IEEE Transactions on Antennas and Propagation
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IEEE A new miniature circular high-impedance surface (HIS) is used to design a compact and low-profile MIMO antenna for wearable applications. The antenna is designed to operate from 2.4 to 2.49 GHz for WLAN application. By employing a pair of degenerated characteristic modes of a circular loop antenna, the MIMO antenna can achieve a good port-to-port isolation ( & #x003E;15 dB) without increasing its geometric size. A four-element HIS is chosen to match the antenna profile and a 2-dBi antenna gain improvement is observed. The design was optimized considering the effect of packaging and then a prototype with the optimal parameters was fabricated and tested. Measurement results are in good agreement with simulations. Furthermore, the loading effect due to lossy human tissue is also considered and the results show that the antenna has a robust performance against the human phantom and a low SAR can also be obtained.