Patent ID: 7931727
Filing Date: 2011-04-26
Classification: F01N

Abstract:
1. A regeneration system comprising: a housing that comprises an upstream end for receiving exhaust gas and a downstream end; a particulate matter (PM) filter arranged in said housing and including a microwave energy absorbing surface; an antenna system comprising N antennas at least partially arranged in said housing, wherein each of said N antennas directs microwave energy directly onto a common face of said microwave energy absorbing surface, where N is an integer greater than two; and an antenna driver module that sequentially drives said antenna system in a plurality of different transverse modes of said antenna system to heat selected portions of said microwave energy absorbing surface during a regeneration event, wherein at least one of said plurality of different transverse modes of said antenna system utilizes less than all of said N antennas during said regeneration event and at least another one of said plurality of different transverse modes of said antenna system utilizes all of said N antennas during said regeneration event.