High efficiency four port circuit

• US 20040000966A1
• Filed: 06/27/2002
• Published: 01/01/2004
• Est. Priority Date: 06/27/2002
• Status: Active Grant

• Current Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Pike, Randy T., Killen, William D.
• Granted Patent: US 6,753,745 B2
• Time in Patent Office: Days
• US Class Current: 333/117
• CPC Class Codes: H01P 5/227 90° branch line couplers
• CPC Class Codes: H05K 1/024 Dielectric details, e.g. changing the dielectric material around a transmission line
• CPC Class Codes: H05K 1/165 incorporating printed inductors

Abstract

A circuit for processing radio frequency signals. The circuit includes a substrate where the circuit can be placed. The substrate can be a meta-material and can incorporate at least one dielectric layer. A four port circuit and at least one ground can be coupled to the substrate. The dielectric layer can include a first region with a first set of substrate properties and a second region with a second set of substrate properties. Substrate properties can include permittivity and permeability. A substantial portion of the four port circuit can be coupled to the second region. The permittivity and/or permeability of the second region can be higher than the permittivity and/or permeability of the first region. The increased permittivities and/or permeabilities can reduce a size of the four port circuit and effect a change in a variety of electrical characteristics associated with the four port circuit.

Claims

1. A circuit for processing radio frequency signals, comprising:

a substrate including at least one dielectric layer, said substrate layer having a first region and at least a second region, said first region having a first set of substrate properties and said second region having a second set of substrate properties, said second set of substrate properties providing different substrate characteristics than said first set of substrate properties;

at least one ground coupled to said substrate; and

,

a four port circuit having sections connected in series and parallel and coupled to said substrate;

wherein at least a portion of said four port circuit is coupled to said second region.

2. The circuit of claim 1 wherein said substrate comprises meta-material.

3. The circuit of claim 1 wherein at least one of said first set of substrate properties and said second set of substrate properties is differentially modified to vary at least one of a permittivity and/or a permeability over a selected region.

4. The circuit of claim 1 wherein said first set of substrate properties comprises a first permittivity and said second set of substrate properties comprises a second permittivity, said second permittivity being higher than said first permittivity.

5. The circuit of claim 4 wherein a propagation velocity of a signal on a quarter-wave transformer section of said four port circuit coupled to said second region is lower than a propagation velocity of a signal on a portion of line coupled to said first region.

6. The circuit of claim 1, wherein the four port circuit comprises four port branch line coupler.

7. The circuit of claim 4 wherein said second permittivity is higher than said first permittivity to effect a change in at least one electrical characteristic of a quarter-wave transformer section of the four port circuit.

8. The circuit of claim 7 wherein said electrical characteristic is selected from the group comprising an impedance, an inductance, a capacitance, quality factor Q and a voltage.

9. The circuit of claim 1 wherein said first set of substrate properties comprises a first permeability and said second set of substrate properties comprises a second permeability, said second permeability being higher than said first permeability.

10. The circuit of claim 9 wherein a propagation velocity of a signal on a quarter-wave transformer section of said four port circuit coupled to said second region is lower than a propagation velocity of a signal on a transmission line coupled to said first region.

11. The circuit of claim 1 wherein said first set of substrate properties comprises a first permittivity and permeability and said second set of substrate properties comprises a second permittivity and permeability, said permittivity and or permeability being higher or lower than said first permittivity and/or permeability.

12. The circuit of claim 11 wherein a propagation velocity of a signal on a quarter-wave transformer section of said four port circuit coupled to said second region is lower than a propagation velocity of a signal on a portion of line coupled to said first region.

13. The circuit of claim 11, wherein the four port circuit comprises four port branch line coupler.

14. The circuit of claim 11 wherein at least one of said second permittivity and second permeability is higher than at least one of said first permittivity and first permeability to effect a change in at least one electrical characteristic of a quarter-wave transformer section of the four port circuit.

15. The circuit of claim 14 wherein said electrical characteristic is selected from the group comprising an impedance, an inductance, a capacitance, quality factor Q and a voltage.

16. A printed circuit for processing radio frequency signals, comprising:

a substrate upon which said circuit can be placed, said substrate including at least one substrate layer, said substrate layer having a first set of substrate properties over a first region, and at least a second set of substrate properties over a second region, said second set of substrate properties providing a different dielectric permittivity and magnetic permeability as compared to said first set of substrate properties;

at least one ground coupled to said substrate; and

,

a four port circuit having parallel and series connections including a plurality quarter-wave transformer line sections with at least a portion of said plurality of quarter-wave transformer line sections coupled to at least a portion of said second region.

17. The circuit of claim 16 wherein at least one of said first set of substrate properties and said second set of substrate properties is controlled to reduce a size of said four port circuit.

18. The circuit of claim 16 wherein at least one of said first set of substrate properties and said second set of substrate properties is controlled to adjust a capacitance between said coupled four port circuit and another metallic structure.

19. The circuit of claim 16 wherein at least one of said first set of substrate properties and said second set of dielectric properties is controlled to adjust the quality factor Q of said four port circuit.

20. A printed circuit for processing radio frequency signals, comprising:

a substrate including substrate regions upon which said circuit can be placed, wherein said circuit is four port branch line coupler, said four port branch line coupler including a plurality of quarter-wave transformer sections and transmission lines; and

at least one ground coupled to said substrate, wherein the plurality of quarter-wave transformer sections and transmission lines are at least partially coupled to respective substrate regions that have substrate characteristics that are each independently customizable.

21. The printed circuit of claim 20, wherein the substrate characteristics that are each independently customizable are selected from the group comprising dielectric permittivity and magnetic permeability.