Radiation-Pattern-Reconfigurable Antenna Using Monopole-Loop for Fitbit Flex Wristband

Author

Chang Min Lee ; Chang Won Jung

Author_Institution

Grad. Sch. of NID Fusion Technol., Seoul Nat. Univ. of Sci. & Technol., Seoul, South Korea

Volume

14

fYear

2015

fDate

2015

Firstpage

269

Lastpage

272

Abstract

This letter presents a radiation-pattern-reconfigurable antenna for a Fitbit Flex wristband, which provides health information about the human body. The advantages of this antenna are improvements in antenna performance and controlling beam directions compared to the existing antenna for the Fitbit Flex. We proposed the placement of an antenna on the upper side of the Fitbit Flex wristband as a monopole antenna. We compared the existing Fitbit Flex antenna to the proposed antennas by several antenna performance factors. Total radiation power (TRP) and total isotropic sensitivity (TIS) are measured, and the specific absorption rate (SAR) result is simulated. The proposed antennas show improvement in performance when compared to the existing Fitbit Flex existing antenna.

Keywords

antenna radiation patterns; biomedical communication; biomedical equipment; monopole antennas; Fitbit flex antenna; Fitbit flex wristband; SAR; TIS; TRP; antenna performance factors; beam direction control; health information; monopole-loop antenna; radiation-pattern-reconfigurable antenna; specific absorption rate; total isotropic sensitivity; total radiation power; Antenna measurements; Antenna radiation patterns; Dipole antennas; Flexible printed circuits; Specific absorption rate; Beam-reconfigurable antenna; Fitbit Flex wristband; specific absorption rate (SAR); total isotropic sensitivity (TIS); total radiation power (TRP);

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2014.2361895

Filename

6930733