(s)
Figure 4: Variation of transmission coefficient with heart
dimensions during a cardiac cycle at specific frequencies in the range
1-10 GHz.
It is seen from the CST MWS simulations that there is the same trend of
increase (upto 0.3s), maximum at 0.3s (time at which the heart is
completely in contracted state) and decrease (from 0.3 to 0.8s) at the
specific frequencies. The shapes of variations of transmission
coefficients are consistent with the variations of heart size in a
cardiac cycle. This is a unique observation for the transmission
coefficients (dB) of the UWB signal corresponding to the varying
dimensions of heart over one cardiac cycle.