By using the absorption of the energy by the orientational polarization in the range of the microwave frequency, many kind of apparatus can be designed. One of these applications may be a microwave dryer. A cylindrical resonator may be used a drying chamber, since a rotating chamber is convenient in order for the wet materials to be exposed uniformly by microwave through the aperture on the axis of the resonator, where a circular cylindrical waveguide is connected and rotating this cylindrical resonator, this dryer rids the material to be dryed of water. Considering the material to be dryed, which attached to the wall of the resonator by the centrifugal force created by the rotation of the resonator as a lossless, dielectric medium with a uniform thickness, a mathematical model can be set.
To use this dryer effectively, the multimode-characteristics within the resonator are needed.
By using this model, the dimension of this dryer to generate more modes, the impedance with respect to the aperture of the resonator and the quality facter for each mode will be studied in this thesis.
