The document discusses wireless power transmission using microwaves. It describes how microwaves are generated using a magnetron, which produces microwaves through the interaction of an electron stream with a magnetic field. It also discusses how rectennas can convert received microwave energy into direct current electricity to charge devices wirelessly. The technology allows charging phones without needing to search for a plug by instead using radio waves to transfer power over the air. However, wireless charging currently has disadvantages like short range and potential radiation concerns compared to wired charging.

2.  The speed of light is about 3x108 meters per second.
 These electromagnetic waves are made up of to two
parts. The first part is an electric field. The second part
is a magnetic field. So that is why they are called
electromagnetic waves. The two fields are at right
angles to each other.

5. Designation Frequency range
L Band 1 to 2 GHz
S Band 2 to 4 GHz
C Band 4 to 8 GHz
X Band 8 to 12 GHz
KU Band 12 to 18 GHz
K Band 18 to 26 GHz
Ka Band 26 to 40 GHz
Q Band 30 to 50 GHz
U Band 40 to 60 GHz
V Band 46 to 56 GHz
W Band 56 to 100 GHz

6. •The MAGNETRON (A) is a self-contained microwave oscillator that
operates differently from the linear-beam tubes, such as the TWT and
the klystron. View (B) is a simplified drawing.

7. The magnetron is a
high-powered vacuum
tube that
generates microwaves
using the interaction of
a stream
of electrons with
a magnetic field.

8. Slotted waveguide Mobile signal
antenna
Circulator
RF
cable
Waveguide

9. A rectenna is a rectifying
antenna, a special type
of antenna that is used to
convert microwave energy
into direct
current electricity. They
are used in wireless power
transmission systems that
transmit power by radio
waves.

10.  Ifwe are running out of battery, then what we need
to do is just call a number from our phone will be
recharged by packet energy within some time
without the need to search for plugging in our phone.
 What we need to do is turn on our laptop or search
for any other laptop or phone users near by and
charge our phone by Bluetooth.

11.  The biggest disadvantage of wireless charging technology
is that it doesn’t have a very large range.
Another disadvantage of wireless chargers is that of
radiation.
More expensive.

12.  Thus
this paper successfully demonstrates a
method of using the power of the microwave to
charge the mobile phones without the use of
wired charger.