Electric heating – Microwave heating – Field modification
Patent
1995-06-05
1997-05-27
Leung, Philip H.
Electric heating
Microwave heating
Field modification
219697, 219746, 219756, H05B 672
Patent
active
056329210
ABSTRACT:
A microwave applicator including a generally cylindrical microwave containment chamber, a microwave energy source, and a feed structure connecting the microwave energy source to the containment chamber. The diameter of the containment chamber is designed according to a process that need only take into account supporting a microwave pattern having substantially only two transverse magnetic modes, each with a characteristic guide wavelength, where the guide wavelength of one mode is substantially equal to twice the guide wavelength of the other mode. Additionally, the interior diameter can be sized to minimize the index subscript numbers of the transverse magnetic modes. The feed structure of the applicator includes at least two feed apertures spaced physically apart around the cylindrical axis of the applicator by a physical angle equal to an electrical phase shift angle of the microwaves introduced through the respective apertures, which in a preferred embodiment is 90 degrees.
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One page, two photographs of a grain dryer believed to be useful as a microwave grain dryer in the practice of the process of U.S. patent 4,728,522 and the apparatus of U.S. patent 4,785,726, dated before Jun. 5, 1995.
Buffler Charles R.
Risman Per O.
Leung Philip H.
The Rubbright Group, Inc.
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