TY  - JOUR
TI  - Pattern diversity antenna for on-body and off-body WBAN links
AB  - Maintaining the quality and the reliability of a wireless body area network (WBAN) has a variety of challenges,one of which is the design of the on-body antenna. The on-body antenna often forms both on-body and off-body linksand needs to have an application-specific pattern to secure the connection. The antenna should direct its energy inparallel to the human skin while establishing an on-body link, ideally omnidirectionally, while an on-body link wouldbenefit from a directional radiation pattern perpendicular to human skin. Moreover, the lossy body tissue is withinthe reactive region of the antenna affecting the antenna performance; hence, the antenna design flow should includethis effect. Here a novel antenna is presented that creates the aforementioned radiation patterns using two switches.For the on-body and the off-body links, the TM00 and the TM01 modes are excited, respectively. The TM00 modegenerates a quasi-omnidirectional pattern with a simulated directivity of 2 dB in the horizontal plane while the TM01mode generates a directional pattern with a directivity of 4.5 dB. Both modes are matched at the 2.45 GHz ISM band.Finally, using numerical and physical phantoms and male subjects, the antenna has been shown to perform well nearhuman bodies: insignificant detuning was observed and the degradation in the radiation efficiency was measured to be17% in the worst-case scenario of locating the antenna on the body with 0 mm separation. Note that the size of theantenna is no bigger than a conventional half-wavelength patch antenna.
AU  - DUMANLI OKTAR, SEMA
PY  - 2018
JO  - Turkish Journal of Electrical Engineering and Computer Sciences
VL  - 26
IS  - 5
SN  - 1300-0632
SP  - 2395
EP  - 2405
DB  - TRDizin
UR  - http://search/yayin/detay/323605
ER  -