NEGATIVE PEMEABILITY OR NEGATIVE PERMITTIVITY META MATERIAL AND SURFACE WAVE WAVEGUIDE

• US 20090033586A1
• Filed: 02/27/2006
• Published: 02/05/2009
• Est. Priority Date: 03/02/2005
• Status: Active Grant

• Current Assignee: Nagaoka University of Technology
• Original Assignee: Nagaoka University of Technology
• Inventors: Sanada, Atsushi
• Granted Patent: US 7,864,114 B2
• Time in Patent Office: Days
• US Class Current: 343/911.R
• CPC Class Codes: H01P 3/00 Waveguides; Transmission lines of the waveguide type
• CPC Class Codes: H01P 3/08 Microstrips; Strip lines

Abstract

Each of unit cells constituting a negative permeability medium includes a metal patch formed on a surface of a dielectric substrate. The dielectric substrate has a rear surface having a ground conductor formed on its entire surface. A positive permeability medium is an existing micro strip line and each of unit cells has a two-dimensional structure having a metal strip connected in four directions. The dielectric substrate has a rear surface having a ground conductor formed on its entire surface. The negative permeability medium is arranged at the left side adjacent to the positive permeability medium formed by unit cells arranged at the right side so that the media oppose to each other. A waveguide formed by the positive/negative permittivity medium or the positive/negative permeability medium of the meta material for propagation of a surface wave is formed at the boundary of the two media.

Claims

1-9. -9. (canceled)

10. A negative permeability metamaterial including:

a dielectric substrate having a front surface and an opposing, rear surface;

a grounding conductor formed over the entire rear surface of the dielectric substrate; and

a plurality of conductor patterns periodically arrayed over the front surface of the dielectric substrate and formed in a square shape, wherein

the conductor patterns are disposed under D.C. insulation from other conductor patterns and the grounding conductor,

the metamaterial manifesting negative permeability to propagating electromagnetic waves.

11. The negative permeability metamaterial according to claim 10, wherein

the vertical and lateral lengths of the conductor patterns are differentiated to provide anisotropy regarding permeability.

19. A surface wave waveguide wherein:

the negative permeability metamaterial according to claim 10 and a positive permeability medium having a positive permeability are positioned adjacent to each other, and

surface waves are enabled to propagate on the boundary between the negative permeability metamaterial and the positive permeability medium.

20. A surface wave waveguide wherein:

the negative permeability metamaterial according to claim 11 and a positive permeability medium having a positive permeability are positioned adjacent to each other, and

surface waves are enabled to propagate on the boundary between the negative permeability metamaterial and the positive permeability medium.

12. A negative permeability metamaterial including:

a dielectric substrate having a front surface and an opposing, rear surface;

a grounding conductor formed all over the rear surface of the dielectric substrate; and

a plurality of conductor patterns periodically arrayed over the front surface of the dielectric substrate and formed in a hexagonal shape, wherein

the conductor patterns are disposed under D.C. insulation from other conductor patterns and the grounding conductor,

the metamaterial manifesting negative permeability to propagating electromagnetic waves.

21. A surface wave waveguide wherein:

the negative permeability metamaterial according to claim 12 and a positive permeability medium having a positive permeability are positioned adjacent to each other, and

surface waves are enabled to propagate on the boundary between the negative permeability metamaterial and the positive permeability medium.

13. A negative permittivity metamaterial including:

a dielectric substrate having a front surface and an opposing, rear surface;

a grounding conductor formed over the entire rear surface of the dielectric substrate;

a first conductor strip formed in a first direction over the front surface of the dielectric substrate and arrayed periodically;

a second conductor strip formed in a second direction crossing the first direction over the front surface of the dielectric substrate and arrayed periodically; and

a conductor via arranged to match each crossing position of the first conductor strip and the second conductor strip, and connecting at least one of the first conductor strip and the second conductor strip to the grounding conductor,

the metamaterial manifesting negative permittivity to propagating electromagnetic waves.

15. The negative permittivity metamaterial according to claim 13, wherein:

anisotropy regarding permeability is provided by decomposing the directional symmetry of the conductor strips.

17. The negative permittivity metamaterial according to claim 13, wherein:

anisotropy regarding permeability is provided by altering the position of the conductor via.

22. A surface wave waveguide wherein:

the negative permittivity metamaterial according to claim 13 and a positive permittivity medium having a positive permittivity are positioned adjacent to each other, and

surface waves are enabled to propagate on the boundary between the negative permittivity metamaterial and the positive permittivity medium.

14. A negative permittivity metamaterial including:

a dielectric substrate having a front surface and an opposing, rear surface;

a grounding conductor formed over the entire rear surface of the dielectric substrate;

a first conductor strip formed in a first direction over the front surface of the dielectric substrate and arrayed periodically;

a second conductor strip formed in a second direction crossing the first direction over the front surface of the dielectric substrate and arrayed periodically;

a third conductor strip formed in a third direction over the front surface of the dielectric substrate and to cross the first conductor strip and the second conductor strip in the crossing position between the first conductor strip and the second conductor strip, and arrayed periodically; and

a conductor via arranged to match each crossing position of the first through third conductor strips, and connecting at least one of the first through third conductor strips to the grounding conductor,

the metamaterial manifesting negative permittivity to propagating electromagnetic waves.

16. The negative permittivity metamaterial according to claim 14, wherein:

anisotropy regarding permeability is provided by decomposing the directional symmetry of the conductor strips.

18. The negative permittivity metamaterial according to claim 14, wherein:

anisotropy regarding permeability is provided by altering the position of the conductor via.

23. A surface wave waveguide wherein:

the negative permittivity metamaterial according to claim 14 and a positive permittivity medium having a positive permittivity are positioned adjacent to each other, and

surface waves are enabled to propagate on the boundary between the negative permittivity metamaterial and the positive permittivity medium.