Lg Electronics Inc.

Kyu Wan Cho

Eung Su Kim

Yuri Brodsky

Kovalev Nikolai

A multimode electromagnetic wave energy rejection filter arrangement for a slot waveguide includes at least one system of series coupled LC-circuits located, at least partly, within a cavity of the slot waveguide and arranged along a predetermined line intersecting the wave vectors of electromagnetic waves to be rejected, the LC-circuits including lumped elements and the coupling between the LC-circuits being substantially weak. The LC-circuits may be located, at least partly, within grooves formed in a wall of the slot waveguide. As applied to a heating apparatus employing high frequency electromagnetic wave energy or microwave energy for heating dielectric materials, the series coupled LC-circuits are arranged along a closed line which envelopes the access opening in a body of a multimode resonator heating chamber, in which the high frequency electromagnetic wave energy is employed for heating. By optimizing the parameters of the system of series coupled LC-circuits it is possible to provide rather low transmittance for a wide range of angles of incidence of waves, as well as to minimize the transmittance dependence on the angles of incidence of these waves. The later enables to achieve high protection against leaks of electromagnetic energy from the resonator heating chamber of a heating apparatus, for example, of a domestic microwave oven.

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Kyungki-Do, South Korea

Kyu Wan Cho