Roper Corporation

Frederick K Uyeda

Buddy Julian Austin

A static antenna system using a monopole shaped to deliver and evenly distribute microwave energy in a desired pattern. The monopole is symmetrical with respect to its axis, and the cross sectional area taken in planes perpendicular to the axis is varied to control the shape and location of the radiated pattern. The resulting even energy distribution is accomplished without the need for moving parts of any kind.

Shaped antenna for energy distribution in a microwave cooking cavity

A microwave oven in the form of an enclosed cavity having a magnetron and waveguide communicating with the cavity via a hollow conductor penetrating one of the walls. Centrally mounted in the conductor is an antenna having a straight shank portion and a radially extending arm portion, with an angled transitional portion inbetween, the transitional portion bearing an obtuse angle to the shank portion lying within the range of 105.degree. and 165.degree. and having a length at least equal to the radius of the hollow conductor so that the transitional portion and the arm portion radiate a 'guided' wave in a direction different from that of the 'inertial' wave radiated directly from the hollow conductor. The shank portion of the antenna is supported in a rotatable mount in the waveguide, and a motor coupled to the mount rotates the antenna for sweeping the guided wave throughout the cavity for improved energy distribution in the cavity and relative freedom from hot spots. In the preferred form of the invention the radially extending arm portion has a length greater than the transitional portion and the cavity includes a thermal heating element which is arranged substantially in the plane of the arm portion. In an alternate form of the invention only the shank and the angled portion are used so that the rotated antenna is of dogleg shape.

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Attica, IN, United States of America

Frederick K Uyeda