A microwave oven antenna having a three-dimensional motion. A vertical shaft has a microwave antenna coupled to a first end and is attached at a second end to a first driven gear. A cam follower member extends from the first driven gear to engage with a second driven gear having a slanted surface. The...http://www.google.com.au/patents/US5182426?utm_source=gb-gplus-sharePatent US5182426 - Microwave oven having an improved antenna
