Directional coupler

Patent metadata

Field	Value
Publication number	US-9964571-B2
Application number	US-201314889490-A
Country	US
Kind code	B2
Filing date	May 6, 2013
Priority date	May 6, 2013
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A directional coupler is configured to provide a forward and/or a backward signal derived from a high-frequency signal. The directional coupler comprises a coupling element coupled to a main line, wherein the main line is configured to transport the high frequency signal. The directional coupler further comprises a signal line connecting the coupling element to a measuring port. The signal line comprises a defected ground structure inserted between the coupling element and the measuring port.

First claim

The invention claimed is:

1. A directional coupler for providing a forward or a backward signal derived from a high-frequency signal, the directional coupler comprising:
a coupling element coupled to a main line, which transports the high-frequency signal; and
a signal line connecting the coupling element to a measuring port to provide the forward or backward signal;
wherein the signal line further comprises a defected ground structure; and
wherein the defected ground structure is inserted between the coupling element and the measuring port.

2. A directional coupler as recited in claim 1 , further comprising:
a substrate comprising a first surface and a second surface, wherein the signal line is arranged on the first surface, and wherein the defected ground structure is build in a metallic plane arranged on the second surface.

3. A directional coupler as recited in claim 2 ,
wherein the metallic plane is connected to a reference potential of the high-frequency signal;
wherein a resistor element is arranged in the defected ground structure, the resistor element comprising a first contact pin coupled to a first metallic extension of the defected ground structure and a second contact pin coupled to a second metallic extension of the defected ground structure; and
wherein the first metallic extension and the second metallic extension of the defected ground structure are separated via a non-metallic bar of the defected ground structure.

4. A directional coupler as recited in claim 2 ,
wherein the metallic plane is connected to a reference potential of the high-frequency signal; and
wherein a resistor element is arranged on the first surface of the substrate and the resistor element comprising a first contact pin coupled to the signal line and the resistor element comprising a second contact pin coupled to the reference potential of the high-frequency signal.

5. A directional coupler as recited in claim 4 , wherein a second resistor element is arranged on the first surface of the substrate and the second resistor element comprises a first contact pin coupled to the signal line and the second resistor element comprising a second contact pin coupled to the reference potential of the high-frequency signal.

6. A directional coupler as recited in claim 2 ,
wherein a capacitance element is arranged in the defected ground structure, the capacitance element comprising a first contact pin coupled to a first metallic extension of the defected ground structure and a second contact pin coupled to a second metallic extension of the defected ground structure; and
wherein the first metallic extension and the second metallic extension of the defected ground structure are separated via a non-metallic bar of the defected ground structure.

7. A directional coupler as recited in claim 2 , wherein a capacitance element is arranged on the first surface of the substrate, the capacitance element comprises a first contact pin coupled to the signal line and the capacitance element comprises a second contact pin coupled to a reference potential of the high-frequency signal.

8. A directional coupler as recited in claim 7 , wherein a second capacitance element is arranged on the first surface of the substrate, the second capacitance element comprises a first contact pin coupled to the signal line and the second capacitance element comprises a second contact pin coupled to the reference potential of the high-frequency signal.

9. A directional coupler as recited in claim 1 , wherein the signal line further comprises a second defected ground structure and wherein the second defected ground structure is inserted between the defected ground structure and the measuring port.

10. A directional coupler as recited in claim 1 , wherein the signal line further comprises an inductance element arranged in series between the coupling element and the measuring port.

11. A directional coupler as recited in claim 10 , wherein the signal line further comprises a second inductance element arranged in series to the inductance element.

12. A directional coupler as recited in claim 11 , wherein an inductance ratio of the inductance element and the second inductance element is in the range between about 1:2 and about 1:10.

13. A directional coupler as recited in claim 1 , wherein the signal line further comprises a frequency trimming element coupled in series between the coupling element and the measuring port.

14. A directional coupler as recited in claim 1 ,
further comprising a second signal line connecting the coupling element to a second measuring port to provide the forward or backward signal;
wherein the second signal line comprises a defected ground structure; and
wherein the defected ground structure is inserted between the coupling element and the second measuring port.

15. A directional coupler as recited in claim 1 ,
wherein the directional coupler comprises a second coupling element and a second signal line connects the second coupling element to a second measuring port to provide the forward or backward signal; and
wherein the second signal line comprises a defected ground structure, wherein the defected ground structure is inserted between the second coupling element and the second measuring port.

16. A directional coupler for providing a forward signal and a backward signal derived from a high-frequency signal, the directional coupler comprising:
a coupling element coupled to a main line, which transports the high-frequency signal; and
a signal line connecting the coupling element to a measuring port to provide the forward signal and the backward signal;
wherein the signal line further comprises a defected ground structure; and
wherein the defected ground structure is inserted between the coupling element and the measuring port.

17. A method for directionally coupling to a main line to provide a forward and/or a backward signal derived from a high-frequency signal, the method comprising:
coupling, via a coupling element, to the main line, which transports the high-frequency signal; and
connecting the coupling element to a measuring port, via a signal line, to provide the forward or backward signal, wherein the signal line further comprises a defected ground structure inserted between the coupling element and the measuring port.

18. A method as recited in claim 17 , further comprising:
connecting the coupling element to a second measuring port, via a second signal line, to provide the forward and/or backward signal, wherein the second signal line further comprises a defected ground structure inserted between the coupling element and second the measuring port.

19. A method as recited in claim 17 , further comprising:
connecting a second coupling element to a second measuring port, via a second signal line, to provide the forward and/or backward signal, wherein the second signal line comprises a defected ground structure inserted between the second coupling element and the second measuring port.

Assignees

• Rohde & Schwarz

Inventors

• Andrei Andreas
• Göritz Raimon

Classifications

• H01P5/183 Primary

  at least one of the guides being a coaxial line · CPC title

• H03H7/48

  Networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source (phase shifters providing two or more output signals H03H7/21) · CPC title

• H01P5/184

  the guides being strip lines or microstrips · CPC title

• G01R21/00 Primary

  Arrangements for measuring electric power or power factor (G01R7/12 takes precedence) · CPC title

• G01R15/14

  Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks · CPC title