Dielectric ceramic filter

• US 5,912,798 A
• Filed: 07/02/1997
• Issued: 06/15/1999
• Est. Priority Date: 07/02/1997
• Status: Expired due to Fees

• Current Assignee: Landsten Chu
• Original Assignee: Landsten Chu
• Inventors: Chu, Te-Yi
• Primary Examiner(s): Kincaid, Kristine
• Assistant Examiner(s): Dinkins, Anthony
• Application Number:
  US08/887,223
• Time in Patent Office: 713 Days
• Field of Search: 361/321.3, 361/306.2, 361/321.1, 361/321.5, 361/321.4, 333/202, 333/185, 333/189, 333/207, 333/206, 333/182, 333/183, 333/184, 310/321, 310/358, 310/369, 310/340, 455/200, 455/11.1, 455/20, 29/25.35
• US Class Current: 361/321.3
• CPC Class Codes: H01P 1/20327 Electromagnetic interstage coupling
• CPC Class Codes: H04B 1/52 Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

Abstract

A dielectric ceramic filter of the type which can be applied on high frequency application is provided. The filter includes a ceramic resonator and at least a ceramic capacitor. The ceramic capacitor is disposed between two adjacent resonators. The ceramic filtering capacitor includes a non-metal plate which has been coated with conductive coatings at the upper and lower surfaces respectively. A non-conducting material (or a strong dielectric membrane) having a dielectric coefficient is coated and disposed between said conductive coatings and it can be used in high frequency applications. Wherein the pass band of the filter can be readily defined or modified according to the system such that the signal pass band can be increased or decreased and the impedance rating of the signal can be optimally set to fifty (50) ohms.

Claims

1. A dielectric ceramic filter for high frequency applications, said filter comprising at least two ceramic resonators and at least a ceramic capacitor, the ceramic capacitor being connected between the two resonators such that a coupling capacity between the two resonators is readily modifiable, a pass band of the ceramic capacitor is readily definable or modifiable such that a signal pass band of the dielectric ceramic filter is increasable or decreasable and an impedance rating of the dielectric filter is set optimally to approximately fifty ohms.

2. The dielectric ceramic filter as recited in claim 1, wherein the ceramic filter is used on a transmitting port of a cable or wireless system, the system being a radio frequency or microwave system.

3. The dielectric ceramic filter as recited in claim 2, wherein the cable or wireless system is one of a personal communication system, global position system, cordless phone, satellite communication system, cellular phone, base station and cable television.

4. The dielectric ceramic filter as recited in claim 1, wherein the ceramic filter is used on a receiving port of a cable or wireless system, the system being a radio frequency or microwave system.

5. The dielectric ceramic filter as recited in claim 4, wherein the cable or wireless system is one of a personal communication system, global position system, cordless phone, satellite communication system, cellular phone, base station and cable television.

6. The dielectric ceramic filter as recited in claim 1, wherein the ceramic filter is used on both a transmitting port and receiving port of a cable or wireless system, the system being a radio frequency or microwave system.

7. The dielectric ceramic filter as recited in claim 6, wherein the cable or wireless system is one of a personal communication system, global position system, cordless phone, satellite communication system, cellular phone, base station and cable television.

8. A dielectric ceramic filter for high frequency applications, said filter comprising:

at least two ceramic resonators; and

at least a ceramic capacitor, the ceramic capacitor being connected between the two resonators such that a coupling capacity between the two resonators is readily modifiable, a pass band of the ceramic capacitor is readily definable or modifiable such that a signal pass band of the dielectric ceramic filter is increasable or decreasable and an impedance rating of tie dielectric filter is set optimally to approximately fifty ohms, wherein a non-metallic material and an insulating material are mounted on the ceramic capacitor, the non-metallic material being a strong dielectric membrane.

9. A dielectric ceramic filter for high frequency applications, said filter comprising:

at least two ceramic resonators; and

at least a ceramic capacitor, the ceramic capacitor being connected between the two resonators such that a coupling capacity between the two resonators is readily modifiable, a pass band of the ceramic capacitor is readily definable or modifiable such that a signal pass band of the dielectric ceramic filter is increasable or decreasable and an impedance rating of the dielectric filter is set optimally to approximately fifty ohms, wherein the ceramic capacitor includes a non-metallic plate coated with conductive coatings and a non-conducting material, the non-conducting material having a dielectric coefficient and being disposed between the conductive coatings on the non-metallic plate, both an upper and lower surface of the non-metallic plate being coated with the conductive coatings and non-conducting material.