Antennas, devices and systems based on metamaterial structures
Techniques, apparatus and systems that use one or more composite left and right handed (CRLH) metamaterial structures in processing and handling electromagnetic wave signals. Antenna, antenna arrays and other RF devices can be formed based on CRLH metamaterial structures. The described CRLH metamaterial structures can be used in wireless communication RF front-end and antenna sub-systems.
1. A device, comprising:
a ground electrode located on a first surface of a substrate;
a conductive patch located on a second surface of the substrate;
a feed structure electromagnetically coupled to the conductive patch;
an inductive tuned element connected to the conductive patch; and
a second inductive element located on the first surface of the substrate, the second inductive element connecting the inductive tuned element to the ground electrode;
wherein the conductive patch, the inductive tuned element, the second inductive element, and at least a portion of the ground electrode are structured to form a composite right and left handed (CRLH) structure; and
wherein the ground electrode is located entirely outside a projection of a footprint of the conductive patch projected from the second surface onto the first surface.
2. The device as in claim 1 , wherein:
the feed structure is capacitively coupled to the conductive patch.
3. The device as in claim 1 , wherein:
the ground electrode is structured to exclude conductive portions which are proximate the inductive tuned element.
4. The device as in claim 1 , wherein:
the inductive tuned element is smaller in area than a footprint of the conductive patch.
5. The device as in claim 1 , wherein:
the CRLH structure forms a radiating structure.
6. The device as in claim 5 , wherein:
the radiating structure is structured to form a two-dimensional array.
7. The device as in claim 6 , wherein:
the radiating structure supports two modes at two different frequencies.
8. The device as in claim 7 , wherein:
the two modes are comprised of a left-handed (LH) mode and a right-handed (RH) mode.
9. The device as in claim 5 , wherein:
the device is structured to support spatial multiplexing (SM).
10. The device as in claim 5 , wherein:
the device is structured to support space-time block coding (STBC).
11. The device as in claim 5 , wherein:
the device is structured to support beamforming.
12. The device as in claim 5 , wherein:
the device is structured to provide beamforming and nulling.
13. The device as in claim 5 , wherein:
the CRLH radiating structure comprises a bandpass filter with a pass band centered at the wavelength corresponding to a resonance of the CRLH radiating structure.
14. The device as in claim 5 , wherein:
the CRLH radiating structure is structured to resonate at least two different wavelengths.
15. The device as in claim 5 , wherein:
the CRLH radiating structure comprises a signal phase shifter to produce a phase shift in a signal.
16. The device as in claim 5 , wherein:
the CRLH radiating structure is structured to match an impedance at an edge of the CRLH radiating structure.
17. The device as in claim 1 , wherein:
the inductive tuned element is structured to penetrate through the substrate to couple the second inductive element to the conductive patch.
18. The device as in claim 1 , wherein:
the device is part of a wireless communication card to transmit and receive a signal.
19. The device as in claim 1 , wherein:
the device is part of a hand-held wireless communication device to transmit and receive a signal.
20. The device as in claim 1 , wherein:
the device is part of a laptop computer to transmit and receive a signal.
21. A wireless system, comprising:
a radiating structure comprising:
a ground electrode located on a first surface of a substrate;
a conductive patch located on a second surface of the substrate;
a feed structure electromagnetically coupled to the conductive patch;
an inductive tuned element connected to the conductive patch; and
a second inductive element located on the first surface of the substrate, the second inductive element connecting the inductive tuned element to the ground electrode; and
an RF circuit element coupled to the radiating structure;
wherein the conductive patch, the inductive tuned element, the second inductive element, and at least a portion of the ground electrode are structured to form a composite right and left handed (CRLH) structure; and
wherein the ground electrode is located entirely outside a projection of a footprint of the conductive patch projected from the second surface onto the first surface.
22. The wireless system as in 21 , wherein:
at least part of the RF circuit element is structured to form the composite right and left handed (CRLH) structure.
23. The wireless system as in claim 22 , wherein:
the RF circuit element comprises a filter.
24. The wireless system as in claim 22 , wherein:
the RF circuit element comprises a power splitter.
25. The wireless system as in claim 22 , wherein:
the RF circuit element comprises a power combiner.
26. The wireless system as in claim 22 , wherein:
the RF circuit element comprises a directional coupler.
27. The wireless system as in claim 22 , wherein:
the RF circuit element comprises a matching network.
28. The wireless system as in claim 22 , wherein:
the radiating structure comprises a Multiple-Input-Multiple-Output antenna array.
29. A method for forming a device, comprising:
forming a ground electrode located on a first surface of a substrate;
forming a conductive patch located on a second surface of the substrate;
forming a feed structure electromagnetically coupled to the conductive patch;
forming an inductive tuned element connected to the conductive patch; and
forming a second inductive element located on the first surface of the device, the second inductive element connecting the inductive tuned element to the ground electrode;
wherein at least part of the device is structured to form a composite right and left handed (CRLH) structure; and
wherein the ground electrode is formed entirely outside a projection of a footprint of the conductive patch projected from the second surface onto the first surface.