A Taichi-Bagua-based Compact UWB Antenna for WBAN Applications

A Taichi-Bagua-based compact antenna is presented in this letter. It proposes as the on-body receiver antenna with Ultra-Wideband (UWB) low band of 3.1 GHz - 4.8 GHz, aimed at enhancing wireless body area network (WBAN) applications. The antenna is placed on the flexible, high dielectric constant Rogers RO3210
$(\varepsilon_{\mathrm{r}}=10.2)$
, which occupies the dimension of
$22 \times 30\times$
1.27 mm
³
. The simulated reflection coefficient curves show an operating frequency band with 2.81 GHz - 4.80 GHz (1.99 GHz, 52%). The experimental results demonstrate a strong correlation with the simulated ones. The antenna is also measured on a human abdomen, illustrating that the specific absorption rate (SAR) conforms to IEEE safety standards.