Surface mount filter with integral transmission line connection

• US 4,879,533 A
• Filed: 04/01/1988
• Issued: 11/07/1989
• Est. Priority Date: 04/01/1988
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Stillmank, John G., de Muro, David M., Rabe, Duane C.
• Primary Examiner(s): LaRoche, Eugene R.
• Assistant Examiner(s): Ham, Seung
• Application Number:
  US02/176,541
• Time in Patent Office: 585 Days
• Field of Search: 333/202-207, 333/246, 333/222, 333/219, 333/219.1, 333/238, 455/78, 370/30, 370/36, 370/38
• US Class Current: 333/206
• CPC Class Codes: H01P 1/2056 Comb filters or interdigital filters with metallised resonator holes in a dielectric block
• CPC Class Codes: H01P 1/2136 using comb or interdigital filters; using cascaded coaxial cavities H01P1/2131, H01P1/2135 take precedence

Abstract

A surface mount dielectric block filter with an integral transmission line connection to external circuitry is disclosed. In order to connect an input/output capacitor metallized on the surface of the dielectric block to a substrate upon which the dielectric block is directly mounted, a transmission line of appropriate characteristic impedance disposed on the surface of the dielectric block is connected between one plate of the metallized capacitor and an input/output terminal. Two such dielectric block filters may be coupled together to form a radio transceiver duplexer.

Claims

1. A surface mountable dielectric block filter which directly mounts on a conductive surface of a substrate, comprising:

a volume of dielectric material having at least two conductive resonators within said volume of dielectric material and extending from a first surface of said volume of dielectric material to a second surface of said volume of dielectric material, said second surface and at least part of a third surface of said volume of dielectric material being substantially covered with a conductive material;

a first electrode disposed on said first surface of said volume of dielectric material for coupling to a first one of said at least two resonators;

a first terminal disposed on said third surface of said volume of dielectric material for directly connecting to the conductive surface of the substrate; and

a first transmission line disposed on at least one surface of said volume of dielectric material, said first transmission line having first and second ends, coupled at said first end to said first electrode and coupled at said second end to said first terminal.

2. A surface mountable dielectric block filter in accordance with claim 1 wherein each of said at least two conductive resonators further comprises a conductive material substantially covering the surface of a hole extending from said first surface of said volume of dielectric material to said second surface of said volume of dielectric material.

3. A surface mountable dielectric block filter in accordance with claim 1 wherein said first one of said at least two resonators further comprises a second electrode disposed on said first surface of said volume of dielectric material.

4. A surface mountable dielectric block filter in accordance with claim 3 wherein said first electrode and said second electrode further comprise a capacitor.

5. A surface mountable dielectric block filter in accordance with claim 1 further comprising a third electrode disposed on said first surface of said volume of dielectric material for coupling to a second one of said at least two resonators.

6. A surface mountable dielectric block filter in accordance with claim 5 further comprising a second terminal disposed on said third surface of said volume of dielectric material for directly connecting to the conductive surface of the substrate.

7. A surface mountable dielectric block filter in accordance with claim 6 further comprising a second transmission line disposed on at least one surface of said volume of dielectric material, said second transmission line having first and second ends, coupled at said first end to said third electrode and coupled at said second end to said second terminal.

8. A surface mountable dielectric block filter in accordance with claim 1 wherein the conductive surface of the substrate further comprises a pattern which produces a substrate transmission line to which said first terminal is directly connected.

9. A surface mountable dielectric block filter in accordance with claim 1 wherein said conductive material covering at least part of said third surface of said volume of dielectric material is directly connected to the conductive surface of the substrate.

10. A surface mountable dielectric block filter which directly mounts on a conductive surface of a substrate, comprising:

a volume of dielectric material having at least two conductive resonators within said volume of dielectric material and extending from a first surface of said volume of dielectric material to a second surface of said dielectric material, all surfaces of said volume of dielectric material being substantially covered with a conductive material with the exception of said first surface;

a first electrode disposed on said first surface of said volume of dielectric material for coupling to a first one of said at least two resonators;

a first terminal of conductive material disposed on said first surface of said volume of dielectric material for directly connecting to the conductive surface of the substrate; and

a first transmission line disposed on said first surface of said volume of dielectric material, said first transmission line having first and second ends, coupled at said first end to said first electrode and coupled at said second end to said first terminal.

11. A surface mountable dielectric block filter in accordance with claim 10 wherein each of said at least two conductive resonators further comprises a conductive material substantially covering the surface of a hole extending from said first surface of said volume of dielectric material to said second surface of said volume of dielectric material.

12. A surface mountable dielectric block filter in accordance with claim 10 wherein said first one of said at least two resonators further comprises a second electrode disposed on said first surface of said volume of dielectric material.

13. A surface mountable dielectric block filter in accordance with claim 12 wherein said first electrode and said second electrode further comprise a capacitor.

14. A surface mountable dielectric block filter in accordance with claim 10 further comprising a third electrode disposed on said first surface of said volume of dielectric material for coupling to a second one of said at least two resonators.

15. A surface mountable dielectric block filter in accordance with claim 14 further comprising a second terminal of conductive material disposed on said first surface of said volume of dielectric material for directly connecting to the conductive surface of the substrate.

16. A surface mountable dielectric block filter in accordance with claim 15 further comprising a second transmission line disposed on said first surface of said volume of dielectric material, said second transmission line having first and second ends, coupled at said first end to said third electrode and coupled at said second end to said second terminal

17. A surface mountable dielectric block filter in accordance with claim 10 wherein the conductive surface of the substrate further comprises a pattern which produces a substrate transmission line to which said first terminal is directly connected.

18. A surface mountable dielectric block filter in accordance with claim 10 wherein said conductive material substantially covering said surfaces of said volume of dielectric material is directly connected to the conductive surface of the substrate.

19. A surface mountable dielectric block filter which directly mounts on a conductive surface of a substrate, comprising:

a parallelepiped block of dielectric material having at least two resonators formed by two holes extending from a top surface of said parallelepiped block of dielectric material to a bottom surface of said parallelepiped block of dielectric material, said bottom surface and at least first, second, and third side surfaces of said parallelepiped block of dielectric material and surfaces of said at least two holes each being substantially covered with a conductive material;

a first electrode disposed on said top surface of said parallelepiped block of dielectric material for coupling to one of said at least two resonators;

a first terminal disposed on a fourth side surface of said parallelepiped block of dielectric material, for directly connecting to the conductive surface of the substrate; and

a first transmission line disposed on said parallelepiped block of dielectric material, said first transmission line having first and second ends, coupled at said first end to said first electrode and coupled at said second end to said first terminal.

20. A surface mountable dielectric block filter in accordance with claim 19 wherein said first one of said at least two resonators further comprises a second electrode disposed on said first surface of said volume of dielectric material

21. A surface mountable dielectric block filter in accordance with claim 20 wherein said first electrode and said second electrode further comprise a capacitor.

22. A surface mountable dielectric block filter in accordance with claim 19 further comprising a third electrode disposed on said first surface of said volume of dielectric material for coupling to a second one of said at least two resonators.

23. A surface mountable dielectric block filter in accordance with claim 22 further comprising a second terminal disposed on said fourth side surface of said volume of dielectric material for directly connecting to the conductive surface of the substrate.

24. A surface mountable dielectric block filter in accordance with claim 23 further comprising a second transmission line disposed on said parallelpiped block of dielectric material, said second transmission line having first and second ends, coupled at said first end to said third electrode and coupled at said second end to said second terminal.

25. A surface mountable dielectric block filter in accordance with claim 19 wherein the conductive surface of the substrate further comprises a pattern which produces a substrate transmission line to which said first terminal is directly connected.

26. A surface mountable dielectric block filter in accordance with claim 19 wherein said conductive material covering at least part of said surfaces of said parallelpiped block of dielectric material is directly connected to the conductive surface of the substrate.

27. A surface mountable dielectric block filter which directly mounts on a conductive surface of a substrate, comprising:

a parallelepiped block of dielectric material having at least first and second resonators formed by two holes extending from a top surface of said parallelepiped block of dielectric material to a bottom surface of said parallelepiped block of dielectric material, said bottom surface and at least first second, and third side surfaces of said parallelepiped block of dielectric material and surfaces of said two holes each being substantially covered with a conductive material;

a first electrode disposed on said top surface of said parallelepiped block of dielectric material for coupling to said first resonator;

a second electrode disposed on said top surface of said parallelepiped block of dielectric material for coupling to said second resonator;

an input terminal disposed on a fourth side surface of said parallelepiped block of dielectric material, for directly connecting to the conductive surface of the substrate;

an output terminal disposed on said fourth side surface of said parallelepiped block of dielectric material, for directly connecting to the conductive surface of the substrate;

a first transmission line disposed on said parallelepiped block of dielectric material, said first transmission line having first and second ends, coupled at said first end to said first electrode and coupled at said second end to said input terminal; and

a second transmission line having first and second ends, coupled at said first end to said second electrode and coupled at said second end to said output terminal.

28. A surface mountable dielectric block filter in accordance with claim 27 wherein at least one of said at least two resonators further comprises a third electrode disposed on said first surface of said volume of dielectric material.

29. A surface mountable dielectric block filter in accordance with claim 28 wherein said first electrode and said third electrode further comprise a capacitor.

30. A surface mountable dielectric block filter in accordance with claim 27 wherein the conductive surface of the substrate further comprises a pattern which produces a substrate transmission line to which said input terminal is directly connected.

31. A surface mountable dielectric block filter in accordance with claim 27 wherein the conductive surface of the substrate further comprises a pattern which produces a substrate transmission line to which said output terminal is directly connected.

32. A surface mountable dielectric block filter in accordance with claim 27 wherein said conductive material covering at least part of said surfaces of said parallelpiped block of dielectric material is directly connected to the conductive surface of the substrate.

33. A surface mountable dielectric block filter which directly mounts on a conductive surface of a substrate, comprising:

a parallelepiped block of dielectric material having at least two conductive resonators within said volume of dielectric material and extending from a top surface of said parallelepiped block of dielectric material to a bottom surface of said parallelepiped block of dielectric material, said bottom surface and at least first, second, and third side surfaces of said parallelepiped block of dielectric material each being substantially covered with a conductive material;

a first terminal, disposed on a fourth side surface of said parallelepiped block of dielectric material, for directly connecting to the conductive surface of the substrate; and

a transmission line disposed on a fourth side surface of said parallelepiped block of dielectric material, said transmission line coupled to one of said at least two resonators and having first and second ends, said transmission line further coupled at said first end to said conductive material and coupled at least between said first end and said second end to said first terminal.

34. A surface mountable dielectric block filter in accordance with claim 33 wherein each of said at least two conductive resonators further comprises a conductive material substantially covering the surface of a hole extending from said top surface of said parallelepiped block of dielectric material to said bottom surface of said parallelepiped block of dielectric material.

35. A surface mountable dielectric block filter in accordance with claim 33 Wherein said first one of said at least two resonators further comprises a second electrode disposed on said top surface of said parallelepiped block of dielectric material.

36. A surface mountable dielectric block filter in accordance with claim 33 wherein the conductive surface of the substrate further comprises a pattern which produces a substrate transmission line to which said first terminal is directly connected.

37. A surface mountable dielectric block filter in accordance with claim 33 wherein said conductive material covering at least part of said surfaces of said parallelepiped block of dielectric material is directly connected to the conductive surface of the substrate

38. A radio transceiver duplexer comprising:

a substrate having a transmitter leg transmission line and a receiver leg transmission line disposed on said substrate for coupling a transmitter filter and a receiver filter to an antenna;

a first volume of dielectric material comprising;

(a)at least two conductive resonators tuned as a transmitter filter and disposed within said first volume of dielectric material and extending from a first surface of said first volume of dielectric material to a second surface of said first volume of dielectric material, said second surface and at least part of a third surface of said first volume of dielectric material being substantially covered with a conductive material,

(b)a first electrode disposed on said first surface of said first volume of dielectric material for coupling to a first one of said at least two resonators,

(c)a first terminal disposed on said third surface of said first volume of dielectric material for directly connecting to said transmitter leg transmission line, and

(d)a first transmission line disposed on at least one surface of said first volume, said first transmission line having first and second ends, coupled at said first end to said first electrode and coupled at said second end to said first terminal; and

a second volume of dielectric material comprising;

(a)at least two conductive resonators tuned as a receiver filter and disposed within said second volume of dielectric material extending from a first surface of said second volume of dielectric material to a second surface of said second volume of dielectric material, said second surface and at least part of a third surface of said second volume of dielectric material being substantially covered with a conductive material,

(b)a first electrode disposed on said first surface of said second volume of dielectric material for coupling to a first one of said at least two resonators,

(c)a first terminal disposed on said third surface of said second volume of dielectric material for directly connecting to said receiver leg transmission line, and

(d)a second transmission line disposed on at least one surface of said second volume, said second transmission line having first and second ends, coupled at said first end to said first electrode and coupled at said second end to said first terminal.

39. A radio transceiver duplexer in accordance with claim 38 wherein each of said at least two conductive resonators in each of said volumes of dielectric material further comprises a conductive material substantially covering the surface of a hole extending from said first surface of each said volume of dielectric material to said second surface of each said volume of dielectric material.

40. A radio transceiver duplexer in accordance with claim 38 wherein at least one of said first and second volumes of dielectric material further comprises a second electrode of said first one of said at least two resonators disposed on said first surface of said at least one volume of dielectric material.

41. A radio transceiver duplexer in accordance with claim 40 wherein said first electrode and said second electrode further comprise a capacitor.

42. A radio transceiver duplexer comprising:

a substrate having a transmitter leg transmission line and a receiver leg transmission line disposed on said substrate for coupling a transmitter filter and a receiver filter to an antenna;

a first volume of dielectric material comprising;

(a)at least two conductive resonators tuned as a transmitter filter and disposed within said first volume of dielectric material and extending from a first surface of said first volume of dielectric material to a second surface of said first volume of dielectric material, all surfaces of said first volume of dielectric material being substantially covered with a conductive material,

(b)a first electrode disposed on said first surface of said first volume of dielectric material for coupling to a first one of said at least two resonators,

(c)a first terminal disposed on said first surface of said first volume of dielectric material for directly connecting to said transmitter leg transmission line, and

(d)a first transmission line disposed on said first surface of said first volume, said first transmission line having first and second ends, coupled at said first end to said first electrode and coupled at said second end to said first terminal; and

a second volume of dielectric material comprising;

(a)at least two resonators tuned as a receiver filter and disposed within said second volume of dielectric material and extending from a first surface of said second volume of dielectric material to a second surface of said second volume of dielectric material, all surfaces of said second volume of dielectric material being substantially covered with a conductive material,

(b)a first electrode disposed on said first surface of said second volume of dielectric material for coupling to a first one of said at least two resonators,

(c)a first terminal disposed on said first surface of said second volume of dielectric material for directly connecting to said receiver leg transmission line, and

(d)a second transmission line disposed on said first surface of said second volume, said first transmission line having first and second ends, coupled at said first end to said first electrode and coupled at said second end to said first terminal.

43. A radio transceiver duplexer in accordance with claim 42 wherein each of said at least two conductive resonators in each of said volumes of dielectric material further comprises a conductive material substantially covering the surface of a hole extending from a first surface of each said volume of dielectric material to a second surface of each said volume of dielectric material.

44. A radio transceiver duplexer in accordance with claim 42 wherein at least one of said first and second volumes of dielectric material further comprises a second electrode of said first one of said at least two resonators disposed on said first surface of said at least one volume of dielectric material.

45. A radio transceiver duplexer in accordance with claim 42 wherein said first electrode and said second electrode further comprise a capacitor.