A pressure monitoring structure is a very useful element for a wearable device for health monitoring and sports biomechanics. While pressure sensors have been studied extensively, battery-free functions working in wireless detection have not been studied much. Here, we report a 3D-structured origami-based architecture sensor for wireless pressure monitoring. We developed an architectured platform for wireless pressure sensing through inductor-capacitor (LC) sensors and a monopole antenna. A personalized smart insole with Miura-ori origami designs has been 3D printed together with conductive 3D printed sensors seamlessly. Wireless monitoring of resonant frequency and intensity changes of LC sensors have been demonstrated to monitor foot pressure for different postures. The sensitivity of the wireless pressure sensor is tunable from 15.7 to 2.1 MHz/kPa in the pressure ranges from 0 to 9 kPa and from 10 to 40 kPa, respectively. The proposed wireless pressure-sensing platform can be utilized for various applications such as orthotics, prosthetics, and sports gear.
The development of wireless sensing technologies paves the way for advances in the fields of wearable devices, prosthetics, and robotics. Wireless communication between sensors and readers plays an important role in recent internet of things (IoT) technologies. Among many types of wireless sensing devices, wireless passive radio frequency (RF) devices including LC (inductor-capacitor) resonators have been spotlighted. However, passive LC sensors suffer from short-range wireless detection, and their fabrication process requires several processes. Here, we designed a 3D integrated wireless compact LC location sensor fabricated by the 3D printing method for the multi-layered devices. The fabricated wireless sensing system shows the increased wireless reading distance up to ten centimeters. Also, a dielectric material with high dielectric permittivity has been applied to enhance the quality factor of the sensors by 2.5 times with improved wireless detection.
Sensing technology in the Internet-of-Things (IoT) era is one of the key elements in the next industrial revolution. Especially, wireless sensors enable monitoring of various physical and chemical changes through wireless communication in applications like robotics, wearable devices, and biomedical and environmental sensing. Radio Frequency (RF) wireless sensors fabricated by printing methods with conductive materials have been recently spotlighted thanks to lots of benefits that they can provide like a simple operation, cost-effectiveness, customization, etc. Here, we focus on recent studies dedicated to the advances in various RF sensing technologies fabricated by cutting-edge printing methodologies for the realization of desired properties. By capturing recent developments in wireless sensor designs, sensing mechanisms, sensing performance, and printing materials, this Spotlight foresees the future direction of wireless RF sensors printed by industry-proven technologies in different applications.
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