Textile Artificial Magnetic Conductor Waveguide Sheet with Wire Dipoles for Body Centric Communication

Abstract

A textile Artificial Magnetic Conductor (AMC) sheet-like waveguide with wire dipoles were designed to investigate the possibility of improving transmission between antennas. The textile AMC sheet is made of fleece fabric with conductive patches and ground plane made of SHIELDIT fabric. The AMC surface is designed to have in-phase reflection at 2.45GHz with the objective to enhance the transmission between antennas. The S-parameters performance of the two antennas with textile AMC sheet was investigated thoroughly. The effect of different antennas’ placement and distance was also considered. Measurements were conducted rigorously to validate the simulated findings. Results show that the S21 transmission between antennas improved significantly when having the AMC waveguide sheet beneath them. Directive radiation pattern with high gain was also achieved with the proposed AMC sheet-like waveguide.

Textile Artificial Magnetic Conductor Waveguide Jacket for on-Body Transmission Enhancement

“…Such ability to mimic Perfect Magnetic Conductor (PMC) is deemed suitable to be applied to enhance the signal transmission between antennas. Previous results prove that AMC is capable of improving transmission between antennas as well as its performance [37,38]. This special property of AMC made it chosen to be incorporated in the design of an efficient textile waveguide sheet for body centric communication.…”

Artificial magnetic conductor for various antenna applications: An overview

“…This section will discuss the various performance improvements or additional features achieved by incorporating AMC to the antenna structures. The incorporation of AMC to the antenna allows for a low‐profile antenna structure, excites additional resonant frequency, enhances transmission between antennas, improves antenna performance parameters, and increases RFID detection . In Medical Body Area Network (MBAN), AMC is capable of reducing the SAR value whilst providing shielding from radiation toward a patient's body.…”

“…Several other works on AMC for transmission improvements between antennas have also been reported in Refs. and . The transmission between antennas is an important factor especially in on‐body environments where multiple devices are located.…”

Novel monopole antenna on a single AMC cell for low SAR

“…Therefore, SAR reduction is a goal of growing interest. Various techniques have been discussed in the last decades to reduce the mobile terminal's SAR, especially developing techniques for the reduction of the interaction between the mobile device antenna and the user's head and body aiming to reduce the SAR while reducing degradations of the relevant antenna characteristics (such as input impedance, bandwidth, efficiency, as well as the moderate increase of the antenna's front-to-back ratio) were investigated by some authors [14][15][16][17][18][19][20][21][22][23][24][25].…”

“…This also could be attained using magnetic conducting surfaces [17,18] and other planar or mushroom-like metamaterials [19]. Additionally, this should result in more stable antenna characteristics decreasing dependence on the presence and proximity of the user [20]. SAR reductions in the range of 25-75% were achieved while improving or preserving good performance by several authors [21][22][23][24][25].…”