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4-4. Microwave generation system_Magnetron (1/2)
GASKET
ANTENNA (OUTPUT)
FILAMENT (CATHODE)
MAGNET (MAGNETIC CIRCUIT)
ANODE
MAGNET (FERRITE)
VANE
FILAMENT TERMINALS
FEED THROUGH CAPACITOR
FILTER CASE
FILTER
* The magnetron is the energy source for the microwave oven.
ANTENNA
The magnetron is a vacuum tube of special construction.
It is basically a diode with addition of a magnetic field.
ELECTRONS
CATHODE
It consists of a small, coiled heating element (filament) made of tungsten
which readily emits electrons when heated.
This element serves as the cathode (negative element) within the tube.
The anode (positive element of the tube) consists of a thick walled copper
cylinder with vertical vanes extending inward which surround but do not
touch the cathode.
To complete the magnetron, and make it operate distinctly different from
other vacuum tubes, two permanent magnets are mounted over each end
ANODE
of the tube.
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