Abstract
A planar MIMO antenna with slits for WBAN applications is proposed. The antenna consists of two PIFAs, ground pads, and two slits. By adding ground pads, the antenna size is reduced with improved impedance matching. Through two slits in a ground plane, the isolation characteristic is improved and the resonant frequency can be controlled. To analyze the antenna performance on a human body, the proposed antenna on a human equivalent flat phantom is investigated through simulations. Regardless of the existence of the phantom, the antenna operates in 2.4 GHz ISM band with the isolation higher than 18 dB.
Highlights
Wireless body area network (WBAN) systems for medical devices, police and military agencies, sports training, entertainment, and wearable computing have received great attention in conjunction with the rapid development of wireless communication technology [1, 2]
A high isolation characteristic is essential for Multiple-input and multiple-output (MIMO) antenna system in order to achieve independency of multiple signals [12]
Regardless of the existence of the phantom, S11 is maintained below −10 dB and the isolation characteristic is higher than 18 dB over the 2.4 GHz industrial scientific medical (ISM) band (2.4∼2.485 GHz)
Summary
Wireless body area network (WBAN) systems for medical devices, police and military agencies, sports training, entertainment, and wearable computing have received great attention in conjunction with the rapid development of wireless communication technology [1, 2]. A lot of research for the on-body communication channel of WBAN system in the industrial scientific medical (ISM) band has been conducted [8,9,10]. The multipath fading distorts communication signals and reduces the efficiency of WBAN system [11]. Since a diversity technique forces signals to be independently processed, stable communication performance of an antenna system can be achieved in multipath fading environment. A high isolation characteristic is essential for MIMO antenna system in order to achieve independency of multiple signals [12]. A planar MIMO antenna with slits for on-body WBAN applications in 2.4 GHz ISM band (2.4∼ 2.485 GHz) is proposed. The performance of the proposed antenna on the human equivalent flat phantom such as S-parameter characteristics, radiation characteristics, SAR, and an envelope correlation coefficient (ECC) is analyzed
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