Dual-Band Wearable Fluidic Antenna With Metasurface Embedded In A PDMS Substrate

A flexible fluidic antenna with an artificial magnetic conductor (AMC) plane is presented in this work. The overall structure is embedded in polydimethylsiloxane (PDMS), while the radiator is fabricated using eutectic gallium indium alloy (EGaIn) conductor. This radiator operating over an AMC plane is designed based on a rectangular patch which is integrated with slot and slits to enable dual-band WLAN ISM (2.4 and 5.8 GHz) operation, while maintaining a compact form. The integration of the AMC plane behind the proposed antenna reduced backward radiation towards the human users and improved gains. The evaluation of the antenna integrated with the AMC plane indicated satisfactory performance in terms of reflection coefficient, bandwidth and radiation patterns

Miniaturisation of ring shape element frequency selective surface for X-band shielding

A novel miniaturized ring loop (MRL) frequency selective surface (FSS) for X-band signals shielding is presented in this paper. The size of the FSS unit cell is reduced by 17.44% or 0.113λ as compare to the conventional ring shape element. The proposed MRL is designed on 1.6mm Fire-Retardant 4 (FR-4) substrate to provide attenuation at 10 GHz. The simulated results indicating that the proposed MRL FSS exhibits a 37 dB of signal attenuation at 10 GHz at normal and oblique angle up to 45° for both horizontal polarized (TE) and vertical polarized (TM) electric field. The proposed FSS is then fabricated and validated experimentally. The measured results have a good agreement with simulated results. The proposed FSS can be utilized in applications with limited spaced to shield the X-band signals

SAR for Wearable Antennas with AMC Made using PDMS and Textiles

Besides the radiation and reflection performance of wearable antennas, arguably one of the most important parameters is their Specific Absorption Rate (SAR). This work aims to evaluate SAR for wearable antennas integrated with Artificial Magnetic Conductor (AMC) plane made using different material categories – textiles and a flexible polymer,. Two types of textiles, felt and ShieldIt Super are used to build the first, textile-based antenna, while polydimethylsiloxane (PDMS) and the fluidic metal eutectic gallium indium alloy (EGaIn) are used to build the second, polymer-based antenna. Both materials are chosen due to their flexibility conformity to the human body, thus providing comfort to users. Despite the SAR for both antenna types did not exceed the European regulatory limits of 2 W/kg averaged over 10g of tissues; there are considerable differences between them.status: publishe