Abstract
In this article, a compact printed monopole dual-band antenna using artificial magnetic conductor (AMC)-plane with improved gain and broader bandwidth, applicable for off-body internet of things (IoT) devices is presented. The monopole antenna consists of two C-shaped resonators connected through a U-shaped monopole, parasitic elements, discrete ground circular rings and a co-planar waveguide (CPW) feedline. Each artificial magnetic conductor (AMC) unit cell consists of a slotted circular and a square stubs, designed with two zero-crossing phases for improving the radiation characteristics and to achieve the high gain. The overall size of the proposed AMC-backed antenna is 44.4 mm × 44.4 mm × 1.6 mm with electrical dimensions of 0.75λg×0.75λg×0.027λg. This AMC-backed antenna featured measured bandwidths of 9.6% and 12.4% with improved measured gain values of 4.88 dB and 4.73 dB at 2.45 GHz and 5.8 GHz, respectively. The specific absorption rate (SAR) values are analysed and found to be 1.58 W/kg at 2.45 GHz and 0.9 W/kg at 5.8 GHz. Therefore, the proposed AMC-backed antenna is useful for off-body IoT devices operating at 2.45 and 5.8 GHz industrial, scientific, and medical (ISM) band applications.
Highlights
The main objective of a Wireless Body Area Networks (WBANs) is to provide a consistent interconnection between various body-centric devices for communication and sensing
This paper describes a compact metamaterial-based dual-band monopole antenna for off-body communication, sized at 44.4 × 44.4 × 1.6 mm3 (0.75λg × 0.75λg × 0.027λg)
While the total radiation measured efficiency is found to be more than 53% when the artificial magnetic conductor (AMC)-backed antenna is placed over human tissues (HT)
Summary
The main objective of a Wireless Body Area Networks (WBANs) is to provide a consistent interconnection between various body-centric devices for communication and sensing. The proposed antenna had comparatively large size with narrow impedance bandwidths Another AMC-backed dual-band antenna working at 0.86 GHz and 2.4 GHz for wearable applications was reported in [22]. In the third case (ANT III), the rectangular patch is truncated to create two monopoles This results in an operation at 2.5 GHz and 5.82 GHz. In order to move the lower band towards 2.45 GHz while keeping the size compact, the discrete ground circular rings are added behind the substrate and the parasitic elements are introduced on the left and right side of the substrate just below the radiators as presented in ANT IV.
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