Claims
- 1. A dielectric filter, comprising:
a dielectric substrate having a substantially planar upper surface, an opposing lower surface and first and second end surfaces extending between the upper and lower surfaces; an outer conductor formed on at least the lower surface of the dielectric substrate; a plurality of resonance lines, each of the resonance lines:
being located on the upper surface of the dielectric substrate; extending from the first end surface to the second end surface of the dielectric substrate; and having opposite open circuit ends at the end surfaces of the dielectric block; at least one of the resonance lines having at least one stepped part located between its open circuit ends.
- 2. The dielectric filter of claim 1, wherein at least one of the resonance lines has only one stepped part located between its open circuit ends.
- 3. The dielectric filter of claim 1, wherein at least one of the resonance lines has two stepped parts located between its open circuit ends.
- 4. The dielectric filter of claim 1, wherein the resonance lines are parallel to one another.
- 5. The dielectric filter of claim 3, wherein the stepped parts of the at least one resonance line are defined by a center portion that has a first width and two outer portions that have respective widths which are smaller than the first width.
- 6. A communication apparatus comprising a high-frequency circuit which includes at least one of a transmitting circuit and a receiving circuit, wherein said high-frequency circuit includes a dielectric filter comprising:
a dielectric substrate having a substantially planar upper surface, an opposing lower surface and first and second end surfaces extending between the upper and lower surfaces; an outer conductor formed on at least the lower surface of the dielectric substrate; a plurality of resonance lines, each of the resonance lines:
being located on the upper surface of the dielectric substrate; extending from the first end surface to the second end surface of the dielectric substrate; and having opposite open circuit ends at the end surfaces of the dielectric block; at least one of the resonance lines having at least one stepped part located between its open circuit ends.
- 7. The communication apparatus of claim 6, wherein at least one of the resonance lines has only one stepped part located between its open circuit ends.
- 8. The communication apparatus of claim 6, wherein at least one of the resonance lines has two stepped parts located between its open circuit ends.
- 9. The communication apparatus of claim 6, wherein the resonance lines are parallel to one another.
- 10. The communication apparatus of claim 8, wherein the stepped parts of the at least one resonance line are defined by a center portion that has a first width and two outer portions that have widths which are smaller than the first width.
- 11. A dielectric filter, comprising:
a dielectric substrate having first and second opposed end surfaces and at least top and bottom surfaces extending between the opposed end surfaces; an outer conductor formed on at least the bottom surface of the dielectric substrate; a plurality of resonance line holes formed in the dielectric block and extending from the first to the second opposite end surfaces thereof so that one end of the resonance line holes terminate at the one of the end surfaces and the other end of the resonance line holes terminate at the other of the end surfaces; and a respective inner conductor formed on each of the resonance line holes to form respective resonators having open circuits at opposite ends thereof; the diameter of at least one of the resonance line holes varying between the two ends thereof to form at least one stepped part.
- 12. The dielectric filter of claim 11, wherein the resonance line holes are parallel to one another.
- 13. The dielectric filter of claim 11, wherein the diameter of each of at least two of the resonance line holes varies between the two ends thereof to form at least one step.
- 14. The dielectric filter of claim 11, wherein at least one open circuit end of at least one of the resonators is defined by a gap formed in the inner conductor formed on its associated resonance line hole, the gap being spaced from both ends of its associated resonance line hole.
- 15. The dielectric filter of claim 11, wherein the diameter of each of at least two of the resonance line holes varies between the two ends thereof to form at least one step.
- 16. The dielectric filter of claim 15, wherein the step in one of the two resonance line holes is located near one of the end surfaces of the dielectric substrate and the step in the other of the two resonance line holes is located near the other end surface of the dielectric substrate.
- 17. The dielectric filter of claim 15, wherein the step in both of the resonance line holes are located near the same end surfaces of the dielectric substrate.
- 18. The dielectric filter of claim 11, wherein the diameter of each of at least three of the resonance line holes varies between the two ends thereof to form at least one step.
- 19. The dielectric filter of claim 18, wherein, the step formed in two of the resonance line holes is located near one end surface of the dielectric substrate and the step formed in the third of the resonance line holes is located near the second end of the dielectric substrate.
- 20. The dielectric block of claim 11, wherein at least two of the resonance line holes are capacitively coupled to one another via a conductive plating formed on one of the end surfaces of the dielectric substrate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-291578 |
Oct 1999 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This is a continuation of U.S. patent application Ser. No. 09/687,903, filed, in the name of Hideki Tsukamoto et al.
Continuations (1)
|
Number |
Date |
Country |
Parent |
09687903 |
Oct 2000 |
US |
Child |
10265741 |
Oct 2002 |
US |