Abstract— A novel compact shorted patch ON body antenna forwearable application is proposed.

The antennas consists of a microstrip fedshorted patch  with a circular slot inserted in theground plane. More than 30 dB increase in path gain is observed for the proposedantenna compared to reference antennas in the  Into body mode. Simulations and experiments are carried out by makingphantom model corresponding to human tissues.  Keywords—Antenna; Intobody mode; Wearable communication. I.                   INTRODUCTION Wearableantennas are making huge impact on healthcare technology by improving patienthealthcare.

Mainly wearable antennas are used in three modes, ON body, OFF bodyand Into body. ON body mode is used to communicate with other devices placed onthe body while OFF body mode is used for communicating with other devices placedoutside body. On the other hand into body mode is used for communicating withimplantable devices placed inside the body 1. Off body performance of wearable antennashas been investigated thoroughly for UWB communication systems that operatesbetween 3.

1 GHz and 10.6GHz 2 and for applications in the 868 MHz frequencyband 3. Many researches have been conducted about on body antennascommunicating with other on body devices and off body devices as well 4-5.Some works have been reported about on body antennas communicating with implantfor UWB applications 6. But very few works have been reported about on bodyantennas communicating with the implant in the 2.38 GHz ISM band, importantband in medical applications. Microstrip patch antennas (MPA) are suitable candidatefor on body applications due to small size, light weight, easy conformabilityto integrated circuits and so on.

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Narrow bandwidth of aMPA can be improved by using shorted patch microstrip antennas (SMPA). SMPA forover the body communication at 2.4GHz is presented in 7. In the present work,we modified SMPA in 7 to cater to new needs of wearable technology.

Proposed Circularslot SMPA (SMPA-CS) is successful in achieving more than 30 dB increase in pathgain in the Into body mode compared to reference designs. The simple andcompact structure of the antenna makes it a promising candidate among On bodywearable antennas.