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Variable frequency microwave heating apparatus

  • US 5,961,871 A
  • Filed: 03/30/1995
  • Issued: 10/05/1999
  • Est. Priority Date: 11/14/1991
  • Status: Expired due to Term
First Claim
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1. A variable frequency microwave heating apparatus for processing selected materials, said variable frequency microwave heating apparatus including a microwave furnace which defines a multi-mode cavity for processing said selected materials, and said variable frequency microwave heating apparatus comprising:

  • a microwave signal generator for generating a signal with a selected waveform, frequency, and amplitude;

    a first signal amplifier for amplifying said signal generated by said signal generator, said first signal amplifier producing microwaves in a sweeping fashion through a selected useful bandwidth defining a center frequency, said microwaves having an associated power with a selected magnitude, said first signal amplifier comprising a microwave electron device wherein said useful bandwidth is at least five percent of said center frequency, whereby a plurality of independent microwave modes is established in said multi-mode cavity such that a substantially uniform time-averaged power density is created over a working volume of said multi-mode cavity;

    a power supply for supplying power to said first signal amplifier; and

    a transmitter for conveying said microwaves produced by said first signal amplifier into said microwave furnace.

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