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The Performance of On-Body Wearable Antennas in a Repeatable Multipath Environment
The performance of antennas designed for on-body channels is usually evaluated
in an anechoic environment. However, it is also appropriate to determine their performance
under multipath conditions since the presence of off-body paths may significantly improve
on-body links for some antennas. This was investigated by considering the on-body
performance (|S21| path gain) of a range of wearable antennas in the repeatable multipath
environment of a reverberation chamber using a tissue-equivalent experimental phantom,
representative of human muscle tissue at 2.45 GHz. These results were compared with the
equivalent measurements taken in an anechoic far-field chamber. The study shows that
antennas which radiate tangential to the body surface, supporting a surface wave
propagating mode, perform favorably in both environments, which is advantageous in
reliable system design.
Schlüsselwörter: TLY-3, 2.45 GHz, wearable antenna, WBAN, on-body channels, multipath fading, Higher Mode Microstrip Patch Antenna (HMMPA), Mikrostreifenleiter-Patchantenne
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