Development of wearable antenna for preventive healthcare system

2019 Fiscal Year Final Research Report

• Project/Area Number: 19K21080
• Project/Area Number (Other): 18H05908 (2018)
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund (2019); Single-year Grants (2018)
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: Nagasaki University
• Principal Investigator: GUAN ChaiEu 長崎大学, 工学研究科, 助教 (10824584)
• Project Period (FY): 2018-08-24 – 2020-03-31
• Keywords: マイクロストリップパッチアンテナ / 電磁結合給電 / ウェアラブルデバイス / 生体・電磁環境

Outline of Final Research Achievements

In this project, wearable antenna for preventive healthcare system is proposed.　To minimize interaction between the antenna and human body, ungrounded conductor plane is stacked at the bottom of the antenna. Numerical analysis was used to investigate the relationship between the proposed electromagnetics (EM) coupled feed technique and bandwidth characteristics of the antenna. Besides, the relationship between the ungrounded conductor plane and the antenna　characteristics, and related operational principles were clarified. Antenna fed by 1/4 wavelength L-shape microstrip feed line was fabricated and verification was made by comparing the measurement results with　the numerical analysis results.　Based on the outcomes of the study, the proposed antenna has input impedance and radiation pattern with a good tolerance towards human body effect, which makes it a prospective candidate for wearable antenna in the preventive healthcare system.

Free Research Field

通信工学

Academic Significance and Societal Importance of the Research Achievements

WBAN用アンテナは人体の近傍または人体上に装着されるため，人体が放射指向性の変化や入力インピーダンスの不整合を引き起こすことが指摘されている．従来型パッチアンテナは誘電体基板の大きさが有限であるため，基板端部での回折現象によりアンテナ背面にも放射され，人体がアンテナに与える影響を完全に取り除くことが難しい．本研究では，人体によるアンテナの影響を軽減させるため，低姿勢な積層構造のアンテナを提案した．また，提案アンテナが電磁結合給電されていることにより， 2つの隣接した周波数でインピーダンス整合が取れた．これらの研究成果により，提案するアンテナが，人体近傍の短距離無線通信への利用が期待される．