Radiation characteristics of small slot antenna for wristwatch-type pager worn on human body

Authors
Citation
Y. Okano et K. Ito, Radiation characteristics of small slot antenna for wristwatch-type pager worn on human body, ELEC C JP 1, 83(9), 2000, pp. 93-101
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Information Tecnology & Communication Systems
Journal title
ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS
ISSN journal
8756-6621 → ACNP
Volume
83
Issue
9
Year of publication
2000
Pages
93 - 101
Database
ISI
SICI code
8756-6621(2000)83:9<93:RCOSSA>2.0.ZU;2-6
Abstract
In recent years, the demand for compactness in portable radios has become i ncreasingly stronger. This trend is more significant in pagers, and wristwa tch-type pagers have been commercialized. In this article, a small slot ant enna to be installed in the watchband is investigated. Since the present an tenna is used in close proximity to the human body, human models for both t heoretical and experimental studies are created taking into account the hum an body as part of the antenna structure, and the radiation characteristics of the small slot antenna actually worn on the human body are measured and calculated. It is found that a gain of about -15 dBd can be obtained even when the antenna is worn on the human body, and this is enough compared to the gain of -30 dBd required in the antenna for pagers. The radiation patte rn variation due to the position change of the user is also investigated, a nd the radiation patterns are measured and calculated for various positions . It is found that good radiation characteristics as an antenna for pagers can be obtained even considering the arm position variation of users. (C) 2 000 Scripta Technica.