Design of a printed symmetrical CPW-fed monopole antenna for on-body medical diagnosis applications

Choi

et al. 2021

Adv Funct Materials

Latest developments in thin-film electronics have put skin electronics in the limelight. Integration of multiple skin sensors and wireless power transferring ability are cardinal components for continuous acquisition of the human signals, enabling higher level of applications in wearable healthcare and AR/ VR devices. Skin sensor is considerably influenced by target body parts and users where it is attached, and thus face various design adjustments for the best performance. However, most skin electronics using conventional fabrication methods have a fixed design for specific targets and users only and face great challenge when they need design changes, for it has to re-initialize entire fabrication process even for the simplest design modification. Here, in situ and in operando adaptation (SOA) is presented, a revolutionary customizable electronic fabrication platform that allows simultaneous evolvable design modification and addition of new functionality to original skin electronics while they are in operation on a human skin. SOA renders immediate response to various user specifications possible, offering concurrent customization for various wearable and wireless applications including human physiology/motion sensors. Furthermore, SOA offers simultaneous impedance optimization in different body parts and users which enables on-skin wireless power supply. These findings will prove a boon to the development of customizable wearable skin-like electronics.

Section: In Situ and In Operando Adaptationmentioning

confidence: 99%

Evolvable Skin Electronics by In Situ and In Operando Adaptation

Choi

et al. 2021

Adv Funct Materials

“…Wireless power transmission is possible to wearable devices on humans at a nearby distance, and multiple devices as such can be simultaneously operated by a single‐channel transmit system. [ 12–14 ] The operation of electromagnetic devices is based on inductive coupling between the transmitter and the receiver antennas. [ 15–17 ] In addition, although piezo/triboelectric devices efficiently transform daily mechanical motion into electricity; [ 18–24 ] however, the performance and mechanical stability differ depending on the selection of piezoelectric materials and design structure of the device.…”

Section: Introductionmentioning

confidence: 99%

Energy Harvesting Untethered Soft Electronic Devices

Adv Healthcare Materials

Choi

2021

Advances in wearable and stretchable electronic technologies have yielded a wide range of electronic devices that can be conformably worn by, or implanted in humans to measure physiological signals. Moreover, various cutting‐edge technologies for battery‐free electronic devices have led to advances in healthcare devices that can continuously measure long‐term biosignals for advanced human–machine interface and clinical diagnostics. This report presents the recent progress in battery‐less, wearable devices using a wide range of energy harvesting sources, such as electromagnetic energy, mechanical energy, and biofuels. Additionally, this report also discusses the principles and working mechanisms of near/far‐field communications, triboelectric, thermoelectric, and biofuel technologies.

“…The antenna designed in [5][6][7][8][9][10][11][12][13], are all single-band for ISM band application at 2.45 GHz center frequency. The CPW structure was proposed to get a wide bandwidth for antenna design.…”

Section: Introductionmentioning

confidence: 99%

Design a compact CPW monopole antenna on rubber substrate for ISM band application

et al. 2021

One of the most challenging works on compact antenna design is to maintain the flexibility orientation. This paper demonstrates a coplanar waveguide (CPW) fed monopole antenna with rubber substrate at 2.45 GHz center frequency for ISM band application. The proposed antenna attained the realized gain at 4.06 dB with the radiation efficiency around 90% at peak value and the bandwidth of 541.5 MHz. The antenna was designed using the CPW structure. CST microwave studio applied to design the proposed antenna simulation. The main purposed of this study is to improve the antenna performances specially the bandwidth, gain, and radiation efficiency. Moreover, another aim of that antenna design is to reduce the antenna size and thickness upon the existing related design with rubber substrate.