Abstract
A circularly polarized (CP) wearable antenna based on the FDM (fused deposition modeling) technology is proposed. Conductive fabric is used to realize conductive parts of the patch antenna on the NinjaFlex substrate. The antenna is encapsulated with additional layers of NinjaFlex. Modified patch ensures the CP character at 2.45 GHz. Bending and washing tests are conducted to check the performance stability, and good agreement between simulated and measured results is observed. The experimental results illustrate that the antenna holds 11% 10 dB S11 bandwidth and around 70 MHz 3 dB axial ratio bandwidth. In addition, surface current analysis is also given to understand the operating mechanism of CP wave.
Highlights
In recent years, Internet of ings (IoT) gains a rapid growth as being highly valued by commerce, especially in wireless body area network (WBAN). e antennas applied to WBAN are required to equip comprehensive ability due to the complexity of the working environment
More and more circularly polarized (CP) antennas are applied in wireless communication systems such as WiMAX, WLAN, and GPS
We propose an embedded antenna with suppressed backward radiation and suitable for wearable devices in the ISM band and WiMAX band. e CP wave is achieved, and the 3 dB axial ratio bandwidth is around 70 MHz
Summary
Internet of ings (IoT) gains a rapid growth as being highly valued by commerce, especially in wireless body area network (WBAN). e antennas applied to WBAN are required to equip comprehensive ability due to the complexity of the working environment. In order to balance different performances in typical cases, safe wearable patch antennas with foam substrate were presented in [3, 4]. Anks to the electroconductivity, ductility, and easy to integrate in garment, conductive textile performs well in WBAN and makes smart garment possible [6,7,8,9]. Ree-dimensional (3D) printing technologies are popular recently, which could produce more solutions in novel antennas to some extent, such as stereolithography, selective laser sintering, and fused deposition modeling (FDM) [13]. The antenna is fabricated by the FDM technique, and NinjaFlex and conductive fabric are selected as substrate and conductor, respectively. All the aforementioned techniques obtain less multipath losses, inclement weather resistance, conformality, flexibility, easy realization, robustness, water resistance, safety, and chemical stability. As far as we know, this is the first-ever CP antenna based on the NinjaFlexembedded conductive fabric
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