RF Terminator With Improved Electrical Circuit

• US 20100105246A1
• Filed: 10/21/2009
• Published: 04/29/2010
• Est. Priority Date: 10/29/2008
• Status: Active Grant

• Current Assignee: PPC Broadband Incorporated (Belden Inc.)
• Original Assignee: Corning Gilbert Incorporated (Corning Incorporated)
• Inventors: Chien, Irven, Burris, Donald Andrew
• Granted Patent: US 8,231,406 B2
• Time in Patent Office: Days
• US Class Current: 439/578
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 24/44 comprising impedance matching means

Abstract

An RF coaxial terminator includes an impedance match element mounted within a housing. The impedance match element includes a central conductive pin, a supportive element, a ring, and a resistor, wherein the resistor longitudinally extends in a direction that is not coaxial with the longitudinal axis of the central conductive pin.

Claims

1. A coaxial terminator for securing and terminating a coaxial equipment port of an equipment box, the coaxial equipment port being of the type having a female center conductor adapted to receive a center conductor of a coaxial connector, the coaxial equipment port also being of the type including an externally threaded outer conductor surrounding the female center conductor and spaced apart therefrom by a dielectric, the coaxial terminator comprising:

a housing having first and second opposing ends, the first end of the housing having a central bore, and the first end of the housing including an internally threaded region to threadedly engage the outer conductor of the coaxial equipment port through rotation of the housing relative to the coaxial equipment port; and

an impedance match element mounted within said housing, said impedance match element comprising;

a central conductive pin having first and second opposing ends;

a supportive element;

a resistor having first and second opposing ends, wherein the resistor is in electrical communication with the central conductive pin and wherein the resistor longitudinally extends in a direction that is not coaxial with the longitudinal axis of the central conductive pin; and

a conductive ring that is in electrical and mechanical communication with said housing;

wherein said supportive element comprises;

a first area of conductive material in electrical and mechanical communication with said central conductive pin and said resistor; and

a second area of conductive material comprising at least one area in electrical and mechanical communication with said conductive ring and said resistor.

2. The coaxial terminator of claim 1, wherein said second area of conductive material comprises at least one area that is covered by a shielding material and at least one area that is not covered by a shielding material.

3. The coaxial terminator of claim 1, wherein said second area of conductive material comprises at least two areas that are covered by a shielding material and at least two areas that are not covered by a shielding material.

4. The coaxial terminator of claim 2, wherein at least a portion of the at least one area that is not covered by a shielding material is soldered to the conductive ring.

5. The coaxial terminator of claim 3, wherein at least a portion of the at least two areas that are not covered by a shielding material are soldered to the conductive ring.

6. The coaxial terminator of claim 1, wherein the resistor longitudinally extends in a direction that is perpendicular to the longitudinal axis of the central conductive pin.

7. The coaxial terminator of claim 1, wherein the first end of said central conductive pin extends beyond the first end of said housing.

8. The coaxial terminator of claim 1, wherein the housing further comprises a cylindrical cavity between the impedance match element and the second end of the housing, wherein the ratio of the diameter of the cylindrical cavity to the length of the cylindrical cavity ranges from 6:

1 to 1;

1.

9. The coaxial terminator of claim 1, wherein the resistor comprises a coated ceramic block.

10. The coaxial terminator of claim 1, wherein the supportive element comprises a printed circuit board.

11. The coaxial terminator of claim 1, wherein the total length of the terminator along its longitudinal axis is less than about 0.4 inches.

12. The coaxial terminator of claim 1, wherein central conductive pin has a diameter of 0.040 inches±

0.005 inches.

13. The coaxial terminator of claim 1, wherein the first end of the central conductive pin is radiused.

14. The coaxial terminator of claim 1, wherein the first end of central conductive pin is chamfered.

15. The coaxial terminator of claim 1, wherein the second end of the central conductive pin is press-fit through the supportive element.

16. The coaxial terminator of claim 1, wherein said first and second areas of conductive material comprise copper clad traces.

17. The coaxial terminator of claim 1, wherein the housing comprises an internal body and an outer body surrounding the internal body and rotatably secured thereover, the internal body having first and second opposing ends, the first end of the internal body including the internally threaded region to threadedly engage the outer conductor of the coaxial equipment, the outer body having first and second opposing ends, the second end of the outer body having a bore formed therein for allowing the insertion of a tool to rotate the internal body, wherein the impedance match element is mounted within the internal body.

18. The coaxial terminator of claim 15, wherein the total length of the terminator along its longitudinal axis is less than about 1 inch.

19. The coaxial terminator of claim 15, wherein the second end of the internal body further comprises a plurality of slots for engaging said tool.

20. The coaxial terminator of claim 1, wherein the terminator provides for a return loss having an absolute value of at least 25 dB.