Magnetron
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 of the magnetron. CROSSED-ELECTRON and MAGNETIC fields are used in the
magnetron to produce the high-power output required in radar and communication
equipments. The magnetron is classed as a diode because it has no grid.
Receiver Design
The basic addition to
the mobile phone is going to be the rectenna.
A rectenna is a rectifying antenna, a special type of antenna that is
used to directly convert microwave energy into DC electricity. Its elements are
usually arranged in a mesh pattern, giving it a distinct appearance from most
antennae. A simple rectenna can be constructed from a Schottky diode placed
between antenna dipoles. The diode rectifies the current induced in the antenna
by the microwaves.
Sensor Circuitry
The sensor circuitry
is a simple circuit, which detects if the mobile phone receives any message
signal. This is required, as the phone has to be charged as long as the user is
talking. Thus a simple F to V converter would serve our purpose. In India the
operating frequency of the mobile phone operators is generally 900MHz or
1800MHz for the GSM system for mobile communication.
Conclusion
Thus this paper successfully
demonstrates a novel method of using the power of the microwave to charge the
mobile phones without the use of wired chargers.
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