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This paper presents radiation pattern reconfigurable antenna for Fitbit Flex wristband which detects vital signal. Also, the paper presents Specific Absorption Rate (SAR) from the loop-dipole radiation pattern reconfigurable antenna based on the position of human body. The proposed loop-dipole radiation pattern reconfigurable antenna produces two opposite side direction radiation pattern using two RF switches. The resonant frequency of the radiation pattern reconfigurable antenna is Bluetooth communication bandwidth (2.4 2.485 GHz) and the maximum gain of the proposed antenna is 1.96 dBi. The proposed antenna satisfied the standard SAR value of 1.6 W/kg in 1 g tissue of the human body when the Bluetooth communication input average power of 0.04 W is excited to five parts of human body (head, chest, stomach, back, wrist). The maximum SAR value of in this simulation is presented in the part of head. Key Word: Radiation pattern reconfigurable antenna, Fitbit Flex, Bluetooth, SAR      . Corresponding Author : Chang-Won Jung(Seoul National University of Science) Tel: +82-10-9969-4078 email: changwoj@snut.ac.kr Received October 20, 2014 Revised (1st November 10, 2014, 2nd December 9, 2014, 3rd December 29, 2014) Accepted January 8, 2015 1.                .          ,            .    CT ( Computational Tomography) MRI (Magnetic Resonance Imaging)    ,                    SAR   667      .       , RF (Radio Frequency)   .       (wearable)  Fitbit Flex     .         ,   ( ,    )      [1-4].               ,     (Specific Absorption Rate; SAR)    . SAR         [5].            [5].      Fitbit Flex        ,    [6-10].   Fitbit Flex         -       ( , ,  )  .         -          (Specific Absorption Rate; SAR)    SAR  ,           Federal Communication Commission (FCC)    1 g  1.6 W/kg   .

Design of Radiation Pattern Reconfigurable Antenna for Vital Signal Sensing Device Attached on Wristband and SAR Analysis on Human body