Coplanar waveguide transmission line structure configured into non-linear paths to define inductors which inhibit unwanted signals and pass desired signals

Patent metadata

Field	Value
Publication number	US-9647310-B2
Application number	US-201414196678-A
Country	US
Kind code	B2
Filing date	Mar 4, 2014
Priority date	Mar 4, 2014
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A microwave structure having an input section for receiving both a common mode signal and a CPW differential mode signal; an output section; and a CPW transmission line, having a center conductor disposed between a pair of coplanar ground plane conductors, connected between the input section and the output section. The conductors of the CPW transmission line are configured to provide the common mode signal a different attenuation in passing to the output section than the CPW transmission line provides to the differential mode signal passing between the input section and the output section.

First claim

What is claimed is:

1. A transmission line structure having an input port and an output port, comprising:
a strip center conductor disposed between a pair of strip ground plane conductors;
wherein the strip center conductor and the pair of strip ground plane conductors is each configured as an inductor, the strip center conductor and the pair of strip ground plane conductors each having an input connected to the input port and each having an output connected to the output port;
wherein the strip center conductor and pair of strip ground plane conductors maintain a mutual parallel relationship as the strip center conductor and the pair of strip ground plane conductors each extend in side-by-side relationships along continuous, non-linear, parallel paths from the input port of the transmission line structure to the output port of the transmission line structure;
wherein each inductor is configured to inhibit an unwanted signal from passing therethrough; and
wherein the strip center conductor and the pair of strip ground plane conductors are configured to form a coplanar waveguide (CPW) transmission line to pass a desired signal at the input port to the output port.

2. The transmission line structure recited in claim 1 wherein the unwanted signal is a common mode signal and the desired signal is a differential mode signal.

3. The structure recited in claim 1 wherein the center strip conductor and the pair of strip ground plane conductors maintain a mutual parallel relationship as the center strip conductor and the pair of strip ground plane conductors each follow a respective one of the non-linear paths from the input port to the output port.

4. The transmission line structure recited in claim 1 wherein the unwanted signal is a common mode of propagation and the desired signal is a differential mode of propagation.

5. The transmission line structure recited in claim 1 wherein each inductor is configured as having a self-inductance and wherein the self-inductance inhibits the unwanted signal from passing through the configured inductor.

6. The transmission line structure recited in claim 1 wherein the pair of strip ground plane conductors and the strip center conductor is each spiral shaped.

7. The transmission line structure recited in claim 1 wherein the pair of strip ground plane conductors and the strip center conductor is each a meander line.

8. A coplanar waveguide (CPW) transmission line structure for coupling a differential mode microwave signal between an input port and an output port while suppressing common mode signals at the input port, comprising:
a strip center conductor disposed between a pair of strip ground plane conductors;
wherein the strip center conductor and the pair of strip ground plane conductors maintain a mutual parallel relationship as the strip center conductor and the pair of strip ground plane conductors each extend in side-by-side relationships along continuous, non-linear, parallel paths from the input port of the coplanar waveguide transmission line to the output port of the coplanar waveguide transmission line;
wherein the strip center conductor and the pair of strip ground plane conductors is each configured as an individual inductor, each said individual inductor being configured to suppress the common mode signals from passing through each said individual inductor to provide the suppression of the common mode signals at the input port while the strip center conductor and the pair of strip ground plane conductors are configured to provide the CPW transmission line structure and pass the differential mode microwave signals between the input port and the output port through the CPW transmission line structure.

9. A transmission line structure, comprising:
a coplanar waveguide (CPW) transmission line for coupling a microwave signal between an input port and an output port, comprising: a center conductor; and a pair of ground plane conductors; wherein the center conductor and the pair of outer conductors maintain a mutual parallel relationship as the center conductor and the pair of outer conductors each follow a non-linear path from an input of the coplanar waveguide transmission line to an output of the coplanar waveguide transmission line, and;
wherein the center conductor and the pair of ground plane conductors are each configured to provide a different attenuation to an unwanted signal propagation between the input port and the output port from an attenuation provided to a desired signal propagation from the input port to the output port; and
wherein each one of the center conductor and pair of ground plane conductors provides an inductor between the input port and the output port to suppress the unwanted signal propagation in the center conductor or in either one, or both, of the pair of ground plane conductors while the center conductor and the pair of ground plane conductors pass the desired signal propagation between the input port and the output port through the CPW transmission line comprised of the strip center conductor and the pair of strip ground plane conductors.

10. A transmission line structure, comprising:
an input section for receiving both a common mode signal and a differential mode signal;
an output section;
a coplanar waveguide transmission line, having a center conductor disposed between a pair of coplanar ground plane conductors, connected between the input section and the output section;
wherein each one of the center conductor and the pair of ground plane conductors is configured into an inductor between the input section and the output section, each inductor having a self-inductance, the self-inductance inhibiting the common mode signal from passing through said each inductor between the input section and the output section while the center conductor and the pair of coplanar ground plane conductors pass the differential mode signal between the input section and the output section through the coplanar waveguide transmission line;
wherein each one of the center conductor and the pair of ground plane conductors maintains a mutual parallel relationship as the center conductor and the pair of ground plane conductors each follow a non-linear path from the input section of the coplanar waveguide transmission line to the output section of the coplanar waveguide transmission line.

11. The transmission line structure recited in claim 10 wherein the pair of ground plane conductors and the center conductor is each spiral shaped.

12. The transmission line structure recited in claim 10 wherein the pair of ground plane conductors and the center conductor is each a meander line.

13. A microwave structure, comprising:
an input section for receiving both a common mode signal and a CPW differential mode signal;
an output section;
a CPW transmission line, having a center conductor disposed between a pair of coplanar ground plane conductors, connected between the input section and the output section, the center conductor and the pair of ground plane conductors each being configured as an inductor, the center conductor and the pair of coplanar ground plane conductors of the CPW transmission line being configured to provide the common mode signal with a different attenuation in passing to the output section than the CPW transmission line provides to the differential mode signal passing between the input section and the output section;
and
including a capacitor connected between the input section and the output section.

14. The microwave structure recited in claim 13 wherein the capacitor, the center conductor and the pair of coplanar ground plane conductors are disposed on a commo

Assignees

• Raytheon Co

Inventors

• Reza Shahed
• Kessler Keith R
• Laighton Christopher M
• Parkes Michael F

Classifications

• H01P5/04

  with variable factor of coupling · CPC title

• H01P3/003 Primary

  Coplanar lines · CPC title

• H01P1/162

  absorbing spurious or unwanted modes of propagation · CPC title