1. A circulator, comprising:
a) at least three waveguide arms intersecting at a junction, at least a portion of said at least three waveguide arms and said junction defining a first wall and a second wall that are positioned in an opposing relationship;
b) at least one ferrite element positioned within said junction;
c) an impedance transformer positioned in proximity to said at least one ferrite element, said at least one impedance transformer projecting from said first wall; and
d) a recessed transformer positioned in proximity to said impedance transformer, said recessed transformer being recessed within said first wall.
2. A circulator as defined in claim 1, wherein each of said at least three waveguide arms comprises a rectangular tube, wherein opposing inner walls of said rectangular tubes create at least a portion of said first wall and said second wall.
3. A circulator as defined in claim 2, wherein said impedance transformer is a first impedance transformer in a set of two impedance transformers, said two impedance transformers being positioned respectively on said first wall and said second wall in an opposing manner.
4. A circulator as defined in claim 3, wherein each of said two impedance transformers includes at least three transformer arms that extend into respective ones of said at least three waveguide arms.
5. A circulator as defined in claim 3, wherein said recessed transformer is a first recessed transformer in a set of three recessed transformers, wherein each of said three recessed transformers is recessed within a first wall of a respective one of said at least three waveguide arms.
6. A circulator as defined in claim 5, wherein said set of three recessed transformers is a first set of three recessed transformers, said circulator further comprising a second set of three recessed transformers, wherein each of said recessed transformers in said second set of three recessed transformers is recessed within a second wall of a respective one of said at least three waveguide arms.
7. A circulator as defined in claim 5, wherein said first wall and said second wall are separated by a certain distance, wherein a distance between said two impedance transformer is less than said certain distance, and wherein a distance between two opposing ones of said recessed transformers is greater than said certain distance.
8. A circulator as defined in claim 1, wherein said impedance transformer is integrally formed with said first wall.
9. A waveguide circulator comprising three waveguide arms each comprising a first wall and a second wall, said three waveguide arms intersecting at a junction that includes at least one ferrite element therein, each of said three waveguide arms comprising:
i) an impedance transformer projecting from said first wall; and
ii) a recessed transformer that is recessed within said first wall.
10. A waveguide circulator as defined in claim 9, wherein said first wall and said second wall are opposing inner walls of a rectangular waveguide arm.
11. A waveguide circulator as defined in claim 10, wherein each of said three waveguide arms further comprises:
a) an impedance transformer projecting from said second wall; and
b) a recessed transformer that is recessed within said second wall.
12. A waveguide circulator as defined in claim 11, wherein said impedance transformer projecting from said first wall and said impedance transformer projecting from said second wall each include three transformer arms that extend respectively from said junction into said at least three waveguide arms.
13. A waveguide circulator as defined in claim 11, wherein said first wall and said second wall are separated by a certain distance, wherein a distance between said impedance transformers is less than said certain distance, and wherein a distance between two opposing ones of said recessed transformers is greater than said certain distance.
14. A method, comprising:
a) providing a waveguide circulator comprising:
i) at least three waveguide arms intersecting at a junction, the at least three waveguide arms and the junction defining a first wall and a second wall that are positioned in an opposing relationship;
ii) at least one ferrite element positioned within the junction; and
iii) at least one impedance transformer within the waveguide circulator in proximity to the at least one ferrite element, said impedance transformer projecting into the junction;
b) providing at least one recessed transformer into the first wall of the waveguide circulator.
15. A method as defined in claim 14, wherein providing the at least one recessed transformer into the first wall of the circulator comprises machining the at least one recessed transformer into the first wall of the circulator.
16. A method as defined in claim 14, wherein the circulator comprises a first portion and a second portion that are coupled together, said method further comprising separating the first portion of the circulator from the second portion prior to machining the at least one recessed transformer into the first wall.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A gas combustion apparatus for the combustion treatment of an ammonia-containing gas and a hydrogen sulfide-containing gas, said apparatus comprising:
a first combustion section in which a fuel and the ammonia-containing gas are introduced and burned;
a nitrogen oxide reduction section located downstream of the first combustion section, in which a portion of the hydrogen sulfide-containing gas is introduced and the nitrogen oxides transferred from the first combustion section are reduced under a reducing atmosphere; and
a second combustion section located downstream of the nitrogen oxide reduction section, in which the remaining hydrogen sulfide-containing gas, together with air, is introduced and burned.
2. A gas combustion apparatus as claimed in claim 1, wherein the cross section of the gas flow path extending from the first combustion section to the nitrogen oxide reduction section is made smaller than the cross sections of the first combustion section and the nitrogen oxide reduction section.
3. A gas combustion apparatus as claimed in claim 1, wherein a radiation shield is provided between the nitrogen oxide reduction section and the second combustion section.
4. A gas combustion apparatus as claimed in claim 2, wherein a radiation shield is provided between the nitrogen oxide reduction section and the second combustion section.