Abstract
An ultrathin, compact ecofriendly antenna suitable for IoT applications around 2.45 GHz is achieved as a result of exploring the use of Tencel fabric for the antenna’s design. The botanical ecofriendly Tencel is electromagnetically characterized, in terms of relative dielectric permittivity and loss tangent, in the target IoT frequency band. To explore the suitability of the Tencel, a comparison is conducted with conventionally used RO3003, with similar relative dielectric permittivity, regarding the antenna dimensions and performance. In addition, the antenna robustness under bent conditions is also analyzed by measurement. To assess the relevance of this contribution, the ultrathin ecofriendly Tencel-based antenna is compared with recently published antennas for IoT in the same band and also, with commercial half-wave dipole by performing a range test on a ZigBee-based IoT testbed.
Highlights
The Internet of Things (IoT), which currently is the preponderant technology trend, could be defined as a platform grouping and interconnection of devices and objects through a network, where all of them can be visible and interact, collaborate and exchange data with each other without the need for human intervention
AlthoughItRO3003 complies with Restriction of Hazardous Substances (RoHS) regulation [1 is made of ceramic-filled PTFE (Teflon) composites that endow it with very stable relative dielectric ecause its process is free heavy metals it cannot, howeve permittivity withof temperature and very low loss tangent
Table properties of the coplanar waveguide (CPW)-fed monopole antenna obtained for different dielectric almost identical radiation properties that are suitable for IoT applications
Summary
The Internet of Things (IoT), which currently is the preponderant technology trend, could be defined as a platform grouping and interconnection of devices and objects through a network (either private or the Internet), where all of them can be visible and interact, collaborate and exchange data with each other without the need for human intervention. It is noteworthy that achieving compact antennas on textiles is a challenge, since the relative dielectric permittivity values, ranging from 1.17 for fleece to 2.95 for leather [12], are not high compared to other materials commonly used to that aim In this contribution, the possibilities are explored for using a totally ecological textile, not yet used for electronics, as a substrate for an IoT antenna design operating in the 2.4 GHz band. It is firstly required to conduct the electromagnetic characterization of the textile at the intended frequency band This allows us to elucidate if it enables a compact antenna design with suitable performance for an IoT application, in addition to reducing the environmental footprint.
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