Flexible Wearable Composite Antennas for Global Wireless Communication Systems

Abstract

Although wearable antennas have made great progress in recent years, how to design high-performance antennas suitable for most wireless communication systems has always been the direction of RF workers. In this paper, a new approach for the design and manufacture of a compact, low-profile, broadband, omni-directional and conformal antenna is presented, including the use of a customized flexible dielectric substrate with high permittivity and low loss tangent to realize the compact sensing antenna. Poly-di-methyl-siloxane (PDMS) is doped a certain proportion of aluminum trioxide (Al2O3) and Poly-tetra-fluoro-ethylene (PTFE) to investigate the effect of dielectric constant and loss tangent. Through a large number of comparative experiments, data on different doping ratios show that the new doped materials are flexible enough to increase dielectric constant, reduce loss tangent and significantly improve the load resistance capacity. The antenna is configured with a multisection microstrip stepped impedance resonator structure (SIR) to expand the bandwidth. The measured reflection return loss (S11) showed an operating frequency band from 0.99 to 9.41 GHz, with a band ratio of 146%. The antenna covers two important frequency bands, 1.71–2.484 GHz (personal communication system and wireless body area network (WBAN) systems) and 5.15–5.825 GHz (wireless local area network-WLAN)]. It also passed the SAR test for human safety. Therefore, the proposed antenna offers a good chance for full coverage of WLAN and large-scale development of wearable products. It also has potential applications in communication systems, wireless energy acquisition systems and other wireless systems.

Design and development of jeans textile antenna for wireless broadband applications

“…The measured refection return loss (S11) showed an operating frequency band from 0.99 to 9.41 GHz, with a band ratio of 146%. 23…”

Transport Mechanisms and Dielectric Features of Mg-Doped ZnO Nanocrystals for Device Applications

“…Previous studies reveal the importance of developing materials with a high dielectric constant that ensures better energy storage in devices. Such materials have been widely applied to modern wireless communication technology [ 7 ] and electronic components such as capacitors. Similarly, fabricating material with low dielectric loss guarantees proper energy storage.…”

Influence of Various Technologies on the Quality of Ultra-Wideband Antenna on a Polymeric Substrate

“…Additionally, various additives, such as glass or ceramics, might improve dielectric characteristics [ 49 , 50 ]. The low glass transition temperature of polymer substrates can be a limiting factor in printed electronics production technologies that require the heat processing (such as curing or sintering) of conductive layers [ 51 ].…”