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, 1.71ā2.484 GHz (personal communication system and wireless body area network (WBAN) systems) and 5.15ā5.825 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.
Highlights
The rapid development of the field of innovative electronic products has aroused a great deal of interest in the generation of flexible electronic products, especially in mobile communication terminals and wearable electronic products
Antenna design for wireless network communication technology and body local area network application has attracted the attention of the research community [6,7,8], in order to achieve wireless communication with artificial coordinates
Wireless communication has even been involved in the research of biodegradable polymers [9]
Summary
The rapid development of the field of innovative electronic products has aroused a great deal of interest in the generation of flexible electronic products, especially in mobile communication terminals and wearable electronic products. Through using doped polymer materials as the dielectric substrate of the flexible antenna, the band width has great expansibility. It can be used in most wireless communication network frequency bands and the efficiency of the antenna is improved. The purpose of this paper is to design a conformal, compact, low-profile, broadband antenna covering at least 1ā9 GHz effective frequency band for wireless communication systems. The ofan tenna is attached to the simulated human tissue, and the performance impact of the proposed antenna in the wearable field is evaluated by comparing the simulation results with the experimental results.
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