Abstract
Modern ages have observed excessive attention from both scientific and academic communities in the field of flexible electronic based systems. Most progressive flexible electronic systems require incorporating the flexible rubber substrate antenna operating in explicit bands to offer wireless connectivity which is extremely required by today’s network concerned society. This paper characterizes flexible antenna performance under the environments developed by natural rubber as the substrate. Flexible antenna grounded on rubber substrate was simulated using CST microwave studio with diverse permittivity and loss tangent. In our work, prototype antennas were built using natural rubber with different carbon filler substances. This paper reveals advanced flexible substrate effects on antenna quality factor (Q) and its consequences on bandwidth and gain. Such antennas under bending washing environment were also found to perform better than existing designs, showing less change in their gain, frequency shift and impedance mismatch.
Highlights
INTRODUCTIONRubber based substrates are insulators in nature since the atoms in rubber chain are covalent bonded
Modern Flexible Electronics such as flexible mobile phones, electronics books and roll able keyboards are fitted out with an antenna to provide wireless connectivity .The competence of such systems depends on the characteristics of the integrated antenna near human body.Various design parameters of flexible wearable antenna is an important area that required to be evaluated as the different steps involved in its designing are relatively different from the rigid substrate oriented antennas [2].The broad design procedure of flexible and wearable antennas is depicted in figure
The bandwidth for the antenna is increased as Tanδ of the rubber substrate were increased
Summary
Rubber based substrates are insulators in nature since the atoms in rubber chain are covalent bonded Conductive fillers such as carbon fibers or metal oxides are introduced to form the conductive paths in rubber [6,7].Carbon packings imparts a significant effect on the microwave characterization of natural rubber and increase in Tanδ and electrical conductivity ,as reported in [8]. Natural rubber is characterized to design flexible wearable antenna for on-body communications.We conclude our study by reporting characterization of actual antenna prototype, including details of fabrication processes, dielectric properties of the substrate and the consequence of filler contents on antenna quality factor (Q).Further to this, different challenging factors for flexible antennas like bending, wrinkling, Wash ability and environmental factors (humidity and thermal effects) that effects on antenna efficiency and gain in addition to the return loss, radiation pattern are investigated
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