Fig. into the dc. It is then

Fig. 1 shows the general scheme
for the Energy harvesting system. The antenna picks up the signal from the
ambient and fed to the non-linear block which is generally comprised of the Schottky
diode to convert this into the dc. It is then followed by a filter that
eliminate the ripple contents 2, 4. Finally, it is stored or utilized to
power the low power IoT devices. Antenna is followed by an impedance matching
network, this block is very important with respect to the maximum power
transfer 5-6. Its purpose is to match the impedance of antenna to the
complex impedance of the rectifier over a broader band of frequency range thereby
maximizing the power content and signals dynamic range. The storage element and
the power management module (PMM) present an optimum load for achieving high
efficiency. Recently, the power amplifier (PA) based configuration has gained
increased interest 8-9 as the rectifiers are comparatively less efficient 7,
13. The whole process of this extraction of RF to DC is very challenging ascribing
this to the very low level of available RF signal, it therefore necessitates to
achieve high efficiency in such system. Not least, the location dependency and randomness
of the sources exacerbate the task 1. In this context, many research have
been reported which are based on the optimization process than on the
analytical methods. Till now, the reported schemes have only achieved an
efficiency in the range of 15-20 % with a maximum available power of -15 dBm,
which is way below to be utilized in the real system. Energy harvesting concurrently
from two frequency sources have also been reported 2, 14 but it is limited only
to the lower frequencies as the lumped elements constrain its use at higher
frequencies. Impedance compression technique is also limited to higher ambient
power source regions 4. The PA based system is still in the development as it
requires higher power level than available 8-9. Therefore, in order to successfully
harness energy it is imperative that efficient RF energy harvesting schemes be
devised.   

 

 

 

 

 

In order to successfully implement the aforementioned research goal,
there are various steps to be taken by the applicant. It involves course study,
literature survey, proposing design scheme, simulation, prototype preparation,
test and measurements. Apart from this, collaboration with faculty members based
within the university and at other universities may also be required. Finally, it
will finish with publications and reporting etc. The above mentioned steps can be
break into two levels, Master and PhD.

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