Abstract
This article proposes a dual-band slot IFA antenna using a combined technique of liquid metal (LM) filling and polydimethylsiloxane substrate. The antenna working at 2.4 and 5.8 GHz consists of three liquid metal layers—radiation patch, short circuit stub, and ground plane and can be bent to different radiuses for flexible, conformal, and wearable applications. The vacuum filling method enables realization of a monolithic-integrated substrate. The applicability of this antenna for a wearable wristband is validated through simulation.
Highlights
The demand for compact, multiband, and flexible microwave components and antennas is increasing due to the prosperity of the Internet of Things (IoT) [1, 2]
Typical IoT systems are found in a lot of emerging and conventional scenarios, such as smart industry or wireless body area network (WBAN), where various sensors are required for industrial information collecting or human healthcare monitoring, among which conformal or flexible antennas are critical to transit the collected data
Compared to the liquid metal antenna printed on a planar surface with only two layers, can be curved to different radiuses, this prototype antenna realizes a three-dimensional-layered LM structure that utilizes the vertical space of the flexible substrate
Summary
The demand for compact, multiband, and flexible microwave components and antennas is increasing due to the prosperity of the Internet of Things (IoT) [1, 2]. PDMS Antenna for Flexible and Conformal Applications. Such antennas for wearable applications (clothes, shoes, bracelets, and glasses) utilize flexible substrate, including paper, textiles or polymer composites, and conductive materials, such as electro-textiles and nanowire, instead of conventional rigid substrates or metal in cases they can be bent or twisted when worn on the human body [3–6]. The bendable microstrip patch and dipole antennas are constructed by injecting LM into microfluidic channels molded by PDMS [11, 12].
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