Single mode resonant cavity
First Claim
1. A single mode resonant cavity, for use in a catalytic converter system, the cavity being defined by walls which are constructed and arranged such that the cavity allows electromagnetic energy to resonate via a single mode, wherein said walls are adapted such that in use the single mode is excited via a plurality of overlapping wavebands having different respective resonant frequencies, thereby increasing the resonant bandwidth of the cavity.
1 Assignment
0 Petitions
Accused Products
Abstract
A single mode resonant cavity is adapted to absorb energy via a single excitation mode in a plurality of overlapping absorption bands having different respective resonant frequencies, thereby increasing the resonant bandwidth of the cavity. The high Q-factor cavity may form part of a microwave powered catalytic converter for exhaust gas, and has the advantage that as the cavity warms up and physically expands the coupling efficiency between the cavity and a relatively narrow waveband microwave source remains good.
72 Citations
13 Claims
- 1. A single mode resonant cavity, for use in a catalytic converter system, the cavity being defined by walls which are constructed and arranged such that the cavity allows electromagnetic energy to resonate via a single mode, wherein said walls are adapted such that in use the single mode is excited via a plurality of overlapping wavebands having different respective resonant frequencies, thereby increasing the resonant bandwidth of the cavity.
-
7. A catalytic converter system for exhaust gas, comprising a single mode resonant cavity defined by walls which are constructed and arranged such that the cavity allows electromagnetic energy to resonate via a single mode, wherein said walls are adapted such that in use the single mode is excited via a plurality of overlapping wavebands having different respective resonant frequencies, thereby increasing the resonant bandwidth of the cavity, said cavity containing catalyst material, and a source of microwave energy being coupled to the cavity for heating the catalyst material.
- 8. A method of coupling energy via a single excitation mode to a resonant cavity from a source of electromagnetic energy having a given bandwidth, comprising adapting the cavity to allow energy to resonate via the single excitation mode in a plurality of wavebands having different respective resonant frequencies.
Specification