単体アンテナシステムの出力が2倍になるエクストラディメンション(Extra dimension doubles power of standalone antenna system)

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2022-06-17 ペンシルベニア州立大学(PennState)

ウェアラブル・テクノロジーが真にワイヤレスであるためには、もうひとつ、充電器というコードを切断しなければなりません。ペンシルベニア州立大学が率いるチームは、非対称の銅製アーチを使って、無線周波数エネルギーを無線で取得し、それを電気エネルギーに変換して、自分自身と搭載されたセンサーに電力を供給する3Dアンテナシステムを開発し、最初の切り込みを入れました。
この独立型システムは、装着者の機械的な動きを利用して3次元に「飛び出す」アンテナ内の銅製アーチによって実現し、受信および送信能力を向上させたとのことです。研究者らは、この研究成果をNano Energy誌に詳述しています。

<関連情報>

非対称3Dマイクロストリップアンテナに基づく、オンボディ無線通信およびエネルギーハーベスティング可能な自立型ストレッチャブルRFシステム Standalone stretchable RF systems based on asymmetric 3D microstrip antennas with on-body wireless communication and energy harvesting

Senhao Zhang,Jia Zhu,Yingying Zhang,Zhensheng Chen,Chaoyun Song,Jiuqiang Li,NingYi,Donghai Qiu,Kai Guo,Cheng Zhang,Taisong Pan,Yuan Lin,Honglei Zhou,Hao Long,Hongbo Yang,Huanyu Cheng
Nano Energy  Available online:17 February 2022
DOI:https://doi.org/10.1016/j.nanoen.2022.107069

Abstract

As an indispensable component, the stretchable antenna with the potential use in wireless communication and radio frequency (RF) energy harvesting can provide future wearable electronics with a low profile and integrated functions. However, mechanical deformations applied to stretchable antennas often lead to a shift of their resonant frequency (i.e., the detuning effect), which limits their applications to strain sensing. In addition, the on-body radiation efficiency of stretchable antennas severely degrades due to lossy human tissues. In this work, we introduce stretchable microstrip antennas with varying 3D configurations for excellent on-body radiation performance. Compared to their 2D counterpart, the stretchable 3D microstrip antennas showcase a strain-insensitive resonance, improved stretchability, and enhanced peak gain. In particular, the optimized peak gain from the stretchable asymmetric 3D microstrip antenna allows it to wirelessly transmit the energy and data at an almost doubled distance, as well as a doubled charging rate from the harvested RF energy. More importantly, the integration of stretchable antenna and rectenna with stretchable sensing and energy storage units can yield a standalone stretchable RF system for future health monitoring of humans and structures. The results from this work can also pave the way for the development of self-powered units with wireless transmission capabilities for stretchable body area networks and smart internet-of-things.

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