Recent developments in the communication technologies
have made it possible to support accurate operation and
long lifetime of WBANs. Besides, network performance
has been greatly affected by the available energy supply
which is battery in most cases. The limited energy supply
on sensor nodes becomes the bottleneck for measurement,
data transmission, network connection and lifetime. One
method to prolong the lifetime of the node is to increase
the energy capacity of battery. Unfortunately, the capacity
of battery is proportional to its size and weight; tiny sensor
nodes used in body area network to be carried by human
require small form factor, hence solely dependent on battery
is not able to sustain the operation of the sensor node. The
development of energy harvesters is one of the keystones
of the global ongoing research on pervasive and ubiquitous
computing [7], as this would make the wireless sensing
devices meshed in network form to be self-powered and cost
effective. Incorporating with a proper energy storage device,
the solution of using energy harvester will be able to be
applied in body area network for healthcare monitoring