E-plane filter and a method of forming an E-plane filter
AssigneeAR card
InventorMichael Cooper
Life of this patent
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Abstract
An E-plane filter comprises a housing having a waveguide filter channel and a septum defining a plurality of couplers spaced apart along the length of the filter channel, thereby forming a resonator cavity between each adjacent coupler. The portion of the filter channel which accommodates the couplers and each resonator cavity is curved or otherwise changes direction in a plane transverse to the channel walls.
Claims54
An E-plane filter comprising a housing having first and second ports and a waveguide filter channel extending between said ports and for passing electromagnetic energy between said ports, first-and second couplers extending between opposed first and second walls of said waveguide filter channel and spaced apart along said channel to form a resonator cavity therebetween, wherein said waveguide filter channel changes direction in a plane transverse to said first and second walls and within a portion of said filter channel which accommodates said first and second couplers and said resonator cavity.
A septum for an E-plane filter, the septum defining a first coupler and a second coupler each having an end defining a gap for a resonator cavity therebetween, wherein the ends are angled relative to one another in the plane of the septum to form the ends of a resonator cavity to be accommodated in a channel which changes direction within the length of said resonator cavity.
A septum for an E-plane filter, the septum defining a coupler having opposed ends which are angled relative to one another in the plane of the septum, whereby, in use, the coupler is capable of being accommodated in an E-plane filter having a channel which changes direction within the length of said coupler.
A method of forming a septum for an E-plane filter in which the filter has a waveguide channel which changes direction within the length of a resonator cavity, the method comprising the steps of:
- (1) determining the length of a gap between the ends of opposed couplers based on an E-plane filter in which a resonator cavity between said couplers is accommodated in a linear waveguide channel, and
- (2) forming the ends of said opposed couplers based on an E-plane filter having a waveguide channel that changes direction within the length of said resonator cavity such that the length of the center line along the waveguide channel between the ends of said couplers substantially corresponds to the length of said gap determined in step (1).
A method of forming a septum for an E-plane filter in which the filter has a channel which changes direction within the length of a coupler, the method comprising the steps of:
- (1) determining the distance between the opposed ends of a coupler based on an E-plane filter in which the coupler is accommodated within a linear waveguide channel, and
- (2) forming the ends of said coupler based on a waveguide having a channel that changes direction within the length of said coupler such that the length of the center line along said channel between the ends of the coupler substantially corresponds to the length between the ends determined in step (1).
An E-plane filter housing section having a channel formed therein, said channel having opposed first and second walls, wherein a portion of said channel which, in use accommodates at least two couplers and a resonator cavity therebetween changes direction in a plane transverse to said opposed first and second walls.
A method of forming a housing section for an E-plane filter, comprising the steps of:
- (1) defining a waveguide filter channel to be formed in said housing section for passing electromagnetic energy therethrough, the filter channel having opposed walls and a portion of the filter channel, which, in use, accommodates a plurality of couplers and a resonator between adjacent couplers, changes direction in a plane transverse to said opposed walls, and
- (2) forming said housing section with said waveguide filter channel.
A method of making a cast for use in the production of a housing section for an E-plane filter, comprising the steps of:
- (1) defining a waveguide filter channel to be formed in said housing section for passing electromagnetic energy therethrough, the filter channel having opposed walls and a portion of said filter channel, which, in use, accommodates a plurality of couplers and a resonator between adjacent couplers, changes direction in a plane transverse to said opposed walls,
- (2) defining a formation for said cast to form said waveguide filter channel defined in step (1), and
- (3) forming a cast which includes the formation defined in step (2).
A plurality of E-plane filters, each E-plane filter comprising a housing having a waveguide channel formed therein, first and second couplers extending between opposed first and second walls of the channel and spaced apart along said channel to form a resonator cavity therebetween, wherein said channel changes direction in a plane transverse to the first and second walls, the change of direction being defined by a curve in the first and second walls, at least a section of the curved portion of each channel being identical to one another and wherein the position of at least one of the first and second couplers of one E-plane filter relative to the curved portion is different from that of the respective coupler in each of the other E-plane filters.
An E-plane filter comprising a housing having first and second ports and a waveguide filter channel extending between said ports and for passing electromagnetic energy between said ports, a plurality of couplers extending between opposed first and second walls of said waveguide filter channel, and spaced apart along said channel to form a resonator cavity between adjacent couplers, wherein said waveguide filter channel changes direction in a plane transverse to said first and second walls and within a portion of said filter channel which accommodates said plurality of couplers and each resonator cavity.
Dependencies are inferred from the claim text.