Circularly polarized microwave energy feed

Details Circularly polarized microwave energy feed Circularly polarized microwave energy feed

1998-07-10

2000-03-07

Walberg, Teresa

Electric heating

Microwave heating

Field modification

219747, 219750, 219745, H05B 674

Patent

active

060343621

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.

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