Compact Circularly Polarized Wideband Wearable Slot Antenna for WBAN/WLAN Applications

In this paper, a new compact single-layer circularly polarized (CP) slot antenna useful for wearable applications is proposed. The overall size of the antenna is 34.9mm×34.9mm× 0.64mm which is almost 0.23λ
₀
× 0.23λ
₀
× 0.004λ
₀
at the lowest frequency of the operating bandwidth. The antenna 10-dB impedance bandwidth of 33.6% (2.03 - 2.85 GHz), and 3-dB axial ratio bandwidth of 22% (2.34 - 2.92 GHz), make the antenna a good candidate for wireless body area network (WBAN) and wireless local area network (WLAN) applications. The antenna is co-planar waveguide (CPW)-fed, with a rectangular slot on the top, and four rectangular strips at the bottom sides of the substrate, to improve the performance of the antenna in terms of axial ratio. The maximum right handed circular polarization (RHCP) gain of the antenna is 3.2 dBic, occurring at 2.4 GHz and boresight.