Synthesis of a Compact High Impedance Surface Antenna Without Dipole on Top for BCWC

Abstract

In this work, we present a textile, flexible and compact antenna intended for body centric wireless communication (BCWC). The design is based on a High Impedance Surface (HIS) as substrates for dipoles operating in the Initial, Scientific and Medical (ISM) 2.5 GHz band. We demonstrate that the HIS can be used without any dipole on top with a single feed point as low-profile antennas. We analyze two possible feeding mechanisms of an HIS of dogbone-shaped conductors. As a result, the proposed antenna does not change significantly when in close proximity of the body: the HIS is utilized to isolate the user's body from undesired electromagnetic radiation. We show that broadside gain and SAR values of the proposed design compared to conventional dipole antenna. Furthermore, it offers a compact and low profile solution which makes it a good candidate for the wearable WBAN application.