A high gain, low specific absorption rate, oval‐shaped monopole antenna is presented. It is backed by an all‐textile 3 × 3 array of electromagnetic bandgap (EBG) unit cells. The antenna is printed on the thin Rogers ULTRALAM 3850 substrate, while the EBG array is composed of the conductive ShieledIT Super and dielectric substrate felt. The design operates at 2.45 GHz of the Industrial, Scientific, and Medical band. Due to the close distance between the extended grounds of the co‐planar waveguide feeding configuration and the oval‐shaped monopole antenna, current‐coupling was achieved, leading to gain enhancement. However, with body‐loading cases, resonance at 2.45 GHz was attained at a separation of 30 mm. By incorporating the EBG array, as an isolator, this issue was resolved. In free space and over a gap of 3 mm from the human body, gain enhancements by 2.68 and 11.54 dB were achieved at 2.45 GHz, respectively. Simulated and measured results are benchmarked. Furthermore, SAR simulation study showed reductions by 99.5%, averaged over 1 and 10 g of tissue.
Here, a novel design of a planar monopole antenna is presented for wireless body area network (WBAN) wearable applications. The design is fabricated on flexible liquid crystalline polymer (LCP) substrate. The antenna is fed by a uni‐planar coplanar waveguide transmission line and has total size of 51 × 22 mm2. In comparison with its recent published peers, the antenna has the thinnest thickness of 0.1 mm. The antenna is simulated and tested while physically bent. Proposed design along with simulation and experimental results are discussed in this work. Bottom rectangular slabs were added as a modification to the design in order to restore gain at higher frequencies. For the entire operational bandwidth, numerical far field simulations show the suitability of the proposed design to human body loading. A full study targeting specific absorption rate (SAR) has been performed to calculate the maximum input power to the proposed design. The objective has been to prevent any harm to human body as specified by the relevant international non‐ionising radiation exposure standards.
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