Resonance-Frequency Uncertainty Due to Orientation-Specific Wearable-Antenna Bending by Body-Morphology Variations

When bending wearable antennas along various body areas of a representative sample of a given human population, the distribution of their shift in resonance frequency is efficiently computed by an Amoroso-Laguerre generalized polynomial chaos expansion. The varying body morphologies of children, adults and military personnel cause an upward shift when bending textile antennas along their resonant length. This shift is slightly compensated by substrate compression occurring in case of non-stretchable patches. Moreover, this compression causes a downward shift in resonance frequency when bending the antenna along its non-resonant length.