The antenna and phantomwere separated by1mmby the casing
of the tissue-equivalent phantom. An RF-choke was applied
when measuring the radiation pattern, which decreased the uncertainty
caused by common mode errors produced by the gain/
directivity method. There was agreement within 5%. In this
study, the tissue-equivalent phantom exhibited dimensions of
250 mm 150 mm 50 mm. However, average trunk dimensions
can vary by 400 to 550 mm 150 to 200mm 50 to 100
mm, thus, the effect of various trunk dimensions were studied
for comparison. The simulation results are listed in Table IV,
which shows that the antenna peak gains were slightly different,
but the resonant frequencies and radiation efficiencies were similar
for the two trunk dimensions.
VI. CONCLUSION