Ceramic block RF filter having a first plurality of through-hole resonators and a second plurality of through-holes for blocking RF signal coupling

• US 10,333,191 B2
• Filed: 09/21/2017
• Issued: 06/25/2019
• Est. Priority Date: 09/23/2016
• Status: Active Grant

• Current Assignee: CTS Corporation
• Original Assignee: CTS Corporation
• Inventors: Rogozine, Alexandre
• Primary Examiner(s): Lee, Benny T
• Application Number:
  US15/711,024
• Publication Number:
  US 20180090805A1
• Time in Patent Office: 642 Days
• Field of Search: 333206, 333134
• 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 ceramic monoblock RF filter for the transmission of an RF signal comprising a block of dielectric material including opposed top and bottom surfaces, opposed longitudinal side surfaces, and opposed transverse side surfaces. A plurality of spaced apart through-hole resonators extend through the block and terminate in openings in the top and bottom surfaces of the block. A second plurality of grounded RF signal blocking through-holes extend through the block and terminate in respective openings in the top and bottom surfaces of the block. The grounded through-holes are located and positioned in a relationship off-set and on opposite sides of the first plurality of through-hole resonators for blocking the coupling of the RF signal between RF signal input/outputs and selected ones of the first plurality of resonators and also between non-adjacent ones of the first plurality of resonators.

Claims

1. An RF filter for the transmission of an RF signal comprising:

a block of dielectric material including opposed top and bottom surfaces, opposed longitudinal side surfaces, and opposed transverse side surfaces;

at least first and second RF signal input/outputs defined on the block of dielectric material;

a first plurality of resonators defined on the block of dielectric material; and

means on the block of dielectric material for blocking the coupling of the RF signal between the first and/or second RF signal input/outputs and respective ones of the first plurality of resonators or between respective non-adjacent ones of the first plurality of resonators;

the first plurality of resonators comprising a first plurality of through-hole resonators extending through the block of dielectric material and terminating in respective openings in the top and bottom surfaces of the block of dielectric material, the means for blocking the coupling of the RF signal comprising one or more grounded RF signal blocking through-holes extending through the block of dielectric material and terminating in respective openings in the top and bottom surfaces of the block of dielectric material and located in a relationship spaced and off-set from one or more of the first plurality of through-hole resonators; and

the one or more RF signal blocking through-holes being located between and spaced from the first plurality of through-hole resonators and the respective opposed longitudinal side surfaces.

2. The RF filter of claim 1 comprising a plurality of the one or more RF signal blocking through-holes located on opposed sides of and spaced from the first plurality of through-hole resonators.

3. An RF filter for the transmission of an RF signal comprising:

a block of dielectric material including opposed top and bottom surfaces, opposed longitudinal side surfaces, and opposed transverse side surfaces;

a first plurality of through-holes extending through the block and terminating in respective openings in the top and bottom surfaces of the block and defining a first plurality of through-hole resonators; and

a second plurality of through-holes extending through the block and terminating in respective openings in the top and bottom surfaces of the block, the second plurality of through-holes being located between the first plurality of through-holes and one or both of the respective opposed longitudinal side surfaces for blocking the coupling of the RF signal between selected ones of the first plurality of through-hole resonators.

4. The RF filter of claim 3, wherein the second plurality of through-holes are positioned on the block of dielectric material in a relationship spaced and off-set from the first plurality of through-holes.

5. The RF filter of claim 4, wherein the openings of the respective first and second plurality of through-holes defined in the top and bottom surfaces of the block of dielectric material are surrounded by pads of metallization and the interior surface of the respective first and second plurality of through-holes are covered with a layer of metallization to define the first plurality of through-hole resonators and the second plurality of through-holes defining a second plurality of grounded through-holes.

6. An RF filter for the transmission of an RF signal comprising:

a block of dielectric material including opposed top and bottom surfaces, opposed longitudinal side surfaces, and opposed transverse side surfaces;

first, second, and third RF signal input/outputs defined on the block of dielectric material;

a first plurality of through-holes extending through the block and terminating in respective openings in the top and bottom surfaces of the block and defining a first plurality of through-hole resonators; and

a second plurality of grounded through-holes extending through the block and terminating in respective openings in the top and bottom surfaces of the block, the second plurality of grounded through-holes being located and positioned on opposite sides of and spaced from the first plurality of through-holes and further in a relationship off-set from the first plurality of through-holes for blocking the coupling of the RF signal between non-adjacent ones of the first plurality of through-hole resonators and between the first, second, and/or third RF signal input/outputs and selected ones of the first plurality of through-hole resonators.

7. The RF filter of claim 6 wherein a first one of the second plurality of grounded through-holes is positioned adjacent the first RF signal input/output and between first and second ones of the first plurality of through-hole resonators for blocking the coupling of the RF signal between the first RF signal input/output and the first one and a third one of first plurality of through-hole resonators.

8. The RF filter of claim 7 wherein a second one of the second plurality of grounded through-holes is positioned between the third one and a fourth one of the first plurality of through-hole resonators for blocking the coupling of the RF signal between the second one and the fourth one of the first plurality of through-hole resonators.

9. The RF filter of claim 8 wherein a third one of the second plurality of grounded through-holes is positioned adjacent to the second RF signal input/output and between a fifth and a sixth one of the first plurality of through-hole resonators for blocking the coupling of the RF signal between the fifth one of the first plurality of through-hole resonators and the second RF signal input/output.

10. The RF filter of claim 9 wherein a fourth one of the second plurality of grounded through-holes is positioned between the third and fourth ones of the first plurality of through-holes resonators for blocking the coupling of the RF signal between the third one and the fifth one of the first plurality of through-hole resonators.

11. The RF filter of claim 10 wherein a fifth one of the second plurality of grounded through-holes is positioned between the sixth one and a seventh one of the first plurality of through-hole resonators for blocking the coupling of the RF signal between the sixth one and the seventh one of the first plurality of through-hole resonators.

12. The RF filter of claim 11 wherein a sixth one of the second plurality of grounded through-holes is positioned adjacent the second RF signal input/output for blocking the coupling of the RF signal between the second RF signal input/output and the seventh one and an eighth one of the first plurality of through-hole resonators.

13. The RF filter of claim 11 wherein a seventh one of the second plurality of grounded through-holes is positioned adjacent the third RF signal input/output and between eleventh and twelfth ones of the first plurality of through-hole resonators for blocking the coupling of the RF signal between the third RF signal input/output and the eleventh one of the first plurality of through-hole resonators.