Claims
- 1. A microwave filter, including:
- a housing formed by an integral blank of conductive sheet material bent to define a substantially closed cavity; and
- one or more extensions formed by said integral blank projecting into said cavity;
- wherein each of said extensions includes a tuning element and said tuning element comprises a bendable coupling tab.
- 2. A microwave filter, including:
- a housing formed by an integral blank of conductive sheet material bent to define a substantially closed cavity;
- one or more extensions formed by said integral blank projecting into said cavity wherein each of said extensions comprises a resonator; and
- variable resonator coupling means within said housing for adjusting the electromagnetic coupling of said resonators wherein said resonator coupling means comprises a tuning bracket mounted to said housing, said tuning bracket defining a plurality of bendable coupling tabs, each of said coupling tabs arranged substantially equidistant a different pair of said resonators for adjusting the electromagnetic coupling therebetween.
- 3. A microwave filter, including:
- a housing formed by an integral blank of conductive sheet material bent to define a substantially closed cavity;
- one or more extensions formed by said integral blank projecting into said cavity wherein each of said extensions comprises a resonator; and
- variable resonator coupling means within said housing for adjusting the electromagnetic coupling of said resonators wherein said resonator coupling means comprises a plurality of bendable coupling ears formed by said integral blank bent to extend into said cavity, each of said coupling ears arranged substantially equidistant a different pair of said resonators for adjusting the electromagnetic coupling therebetween.
- 4. A microwave filter, including:
- a housing formed by an integral blank of conductive sheet material bent to define a substantially closed cavity;
- one or more extensions formed by said integral blank projecting into said cavity wherein each of said extensions comprises a resonator; said integral blank defining, in said housing, one or more apertures; cavity coupling means formed by said integral blank extending through one of said apertures for coupling an external circuit to said cavity; and
- a plurality of stops defined on said housing by said integral blank for aligning each of said cavity coupling means with a corresponding line of a microstrip circuit receiving said filter.
- 5. A microwave filter, including:
- a housing formed by an integral blank of conductive sheet material bent to define a substantially closed cavity;
- one or more extensions formed by said integral blank projecting into said cavity wherein each of said extensions comprises a resonator; said integral blank defining, in said housing, one or more apertures; and cavity coupling means formed by said integral blank extending through one of said apertures for coupling an external circuit to said cavity wherein said cavity coupling means comprises a capacitance tap, defined by said integral blank, detached from one of said resonators and spaced therefrom on a circuit line associated with said filter.
- 6. A microwave filter, including:
- a housing formed by an integral blank of conductive sheet material bent to define a substantially closed cavity;
- one or more extensions formed by said integral blank projecting into said cavity wherein each of said extensions comprises a resonator; said integral blank defining, in said housing, one or more apertures; and cavity coupling means formed by said integral blank extending through one of said apertures for coupling an external circuit to said cavity wherein said cavity coupling means comprises an inductive loop, defined by said integral blank, bent substantially parallel to one of said resonators.
- 7. A microwave filter, comprising:
- an integral blank of conductive sheet material defining a peripheral edge extending around a plurality of planar portions separated by boundary lines and including a leading planar portion, a trailing planar portion and one or more intermediate planar portions;
- said blank including one or more extensions integrally formed therewith, said extensions extending outward from said peripheral edge and contiguous with said leading planar portion;
- said blank being bent around said boundary lines orienting said planar portions relative to one another to form a substantially closed housing having said leading and trailing portions adjacent to one another, said substantially closed housing defining an internal cavity; and
- said extensions being bent relative to said leading portion to extend into said cavity spaced from said intermediate planar portions.
- 8. The microwave filter of claim 7 wherein:
- one of said intermediate portions defines an aperture;
- one of said extensions defines a tap portion extending therefrom; and
- said tap portion extends through said aperture.
- 9. The microwave filter of claim 7 wherein:
- one of said intermediate planar portions defines an aperture; and
- said blank further includes a loop integrally formed therewith, said loop extending outward from said peripheral edge and contiguous with said leading planar portion, said loop being bent relative to said leading portion to extend through said aperture.
- 10. The microwave filter of claim 7 wherein the tip of at least one of said extensions is bent towards one of said intermediate portions to adjust the capacitance therebetween.
- 11. The microwave filter of claim 7 wherein one of said intermediate planar portions defines an ear bent to project into said cavity.
- 12. The microwave filter of claim 7 further comprising a bracket attached to one of said intermediate planar portions, said bracket defining a plurality of adjustment tabs extending into said cavity and spaced from the others of said intermediate planar portions and from said extensions.
- 13. A method of forming a microwave filter, comprising the steps of:
- defining, with an integral blank of conductive sheet material, a peripheral edge extending around a plurality of planar portions separated by boundary lines and including a leading planar portion, a trailing planar portion and one or more intermediate planar portions;
- defining, with said blank, one or more extensions extending outward from said peripheral edge and contiguous with said leading planar portion;
- bending said blank around said boundary lines to orient said planar portions relative to one another to form a substantially closed housing with said leading and trailing portions adjacent to one another, said substantially closed housing defining an internal cavity; and
- bending said extensions relative to said leading portion to extend into said cavity spaced from said intermediate planar portions.
- 14. The method of claim 13 further comprising the steps of:
- defining an aperture in one of said intermediate portions;
- defining, with said blank, a tap portion to extend from one of said extensions; and
- arranging said tap portion to extend through said aperture.
- 15. The method of claim 13 further comprising the steps of:
- defining an aperture in one of said intermediate portions;
- defining, with said blank, a loop extending outward from said peripheral edge and contiguous with said leading planar portion; and
- arranging said loop to extend through said aperture.
Parent Case Info
This is a continuation of co-pending application Ser. No. 07/710,092 filed on Jun. 4, 1991 now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4829274 |
Green et al. |
May 1989 |
|
5079528 |
Yorita et al. |
Jan 1992 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
710092 |
Jun 1991 |
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