The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 07, 2000
Filed:
Jul. 10, 1998
William J Alton, Groton, MA (US);
Ferrite Components, Inc., Hudson, NH (US);
Abstract
A feed that provides circularly polarized microwave energy such as for energizing a cavity in a microwave oven. The feed includes a transformer to match a linearly polarized rectangular waveguide to an exit waveguide which may be circular or square in cross section. The exit waveguide contains an asymmetrical element that provides symmetry about a plane only. The asymmetrical element therefore introduces a difference in microwave electrical phase of 90 degrees for polarizations which are respectively parallel to and perpendicular to the symmetry plane. The two components add to provide circularly polarized energy at constant magnitude but continually rotating phase. An extension may be used to modify the spread and matching of the energy from the exit waveguide into the enclosure.