Compact Ultra-Wideband Planar Inverted F Antenna on Laminated
Paper-Based Substrate with Reduced Specific Absorption Rate
Sakshi Kumari and Vibha Rani Gupta
This paper presents a laminated paper-based Planar Inverted F Antenna (PIFA) for wireless body area network (WBAN) applications. The major challenges like providing adequate thickness, uniformity of surface, and water wet ability associated with
paper substrate have been transcended in this antenna design by
laminating the substrate with a transparent sheet. The simulated
and measured reflection coefficients of the fabricated antenna in
free space and on human arm are remarkably good, validating
the prototype’s utility. It can operate effectively in GSM, WMTS,
GPS, DCS, ISM, WiMAX, HIPERLAN, WLAN, and UWB frequency bands with S11 less than -10 dB and the gain ranging from 0.94 to 9.53 dB (free space) and 1.03 to 6.07 dB (on-body). The electrical size of the proposed antenna is 0.16 λg x 0.12 λg at 0.7
GHz with a group delay below 2.3 ns over the desired frequency bands. The performance characteristics are also investigated on-body and it encompasses most of the desired frequency bands for the body area network. This paper also analyses the specific absorption rate (SAR) of the designed antenna by placing it on a
tissue-layered human arm model, which is 0.64 Watt/kg, complying with the SAR safety guidelines.