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In Situ Measurement of UHF Wearable Antenna Radiation Efficiency Using a Reverberation Chamber
The radiation efficiency and resonance frequency of five compact antennas worn by nine individual test subjects was
measured at 2.45 GHz in a reverberation chamber. The results show that, despite significant differences in body mass,
wearable antenna radiation efficiency had a standard deviation less than 0.6 dB and the resonance frequency shift
was less than 1% between test subjects. Variability in the radiation efficiency and resonance
frequency shift between antennas was largely dependant on body tissue coupling which is related to both
antenna geometry and radiation characteristics. The reverberation chamber measurements
were validated using a synthetic tissue phantom and compared
with results obtained in a spherical near field chamber and finite difference
time-domain (FDTD) simulation.
Key words: TLY-3, 2.45 GHz, bodyworn antenna, on-body communication, wearable antenna radiation efficiency, WBAN
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