Multiple-Input Multiple-Output Wireless Antennas

• US 20080139136A1
• Filed: 11/09/2007
• Published: 06/12/2008
• Est. Priority Date: 06/24/2005
• Status: Active Grant

• Current Assignee: Ruckus IP Holdings LLC
• Original Assignee: Ruckus Wireless, Inc. (CommScope Holding Company, Inc.)
• Inventors: Shtrom, Victor, Baron, Bernard
• Granted Patent: US 7,646,343 B2
• Time in Patent Office: Days
• US Class Current: 455/101
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 21/205 providing an omnidirectional coverage turnstile aerials H01Q21/26
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 21/245 provided with means for varying the polarisation polarising devices H01Q15/24; tracking by comparing linear polarisation compounds G01S3/146; reducing depolarisation effects H04B7/00; polarisation diversity H04B7/10
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them
• CPC Class Codes: H01Q 3/242 Circumferential scanning
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence

Abstract

High gain, multi-pattern multiple-input multiple-output (MIMO) antenna systems are disclosed. These systems provide for multiple-polarization and omnidirectional coverage using multiple radios, which may be tuned to the same frequency. The MIMO antenna systems may include multiple high-gain beams arranged (or capable of being arranged) to provide for omnidirectional coverage. These systems provide for increased data throughput and reduced interference without sacrificing the benefits related to size and manageability of an associated access point.

Claims

1. A multiple-input multiple-output (MIMO) antenna system, comprising:

a data encoder configured to encode data into a format appropriate for transmission by a radio;

a plurality of parallel radios coupled to the data encoder, the plurality of parallel radios configured to up-convert the data from the encoders into RF signals; and

a MIMO antenna apparatus coupled to the plurality of parallel radios, the MIMO antenna apparatus forming directional radiation patterns for transmission of the RF signals to a remote receiving node, the MIMO antenna apparatus occupying a cubic space.

2. The MIMO antenna system of claim 1, wherein the MIMO antenna apparatus includes a first substrate and a second substrate, each of the substrates including at least two antenna elements and a mechanical slit.

3. The MIMO antenna system of claim 2, wherein the directional radiation patterns are formed by the antenna elements on the first and second substrate, the directional radiation patterns of the first and second substrate being in different polarizations.

4. The MIMO antenna system of claim 2, wherein the cubic space of the MIMO antenna apparatus is defined by the mechanical slit of the second substrate being aligned with and slid over the mechanical slit of the first substrate such that the first substrate and the second substrate are perpendicular to one another.

5. A multiple-input multiple-output (MIMO) antenna apparatus, comprising:

a first substrate having a plurality of antenna elements and a mechanical slit, the plurality of antenna elements configured for selective coupling to a first radio and generating a directional radiation pattern via a radio frequency feed port; and

a second substrate having an antenna element, a mechanical slit, and one or more parasitic antenna elements, the antenna element coupled to a second radio and generating a directional radiation pattern via the radio frequency feed port, the mechanical slit of the second substrate being aligned with and slid over the mechanical slit of the first substrate such that the first substrate and the second substrate are perpendicular to one another, the first and second substrates collectively defining a cubic space.

6. The MIMO antenna apparatus of claim 5, further comprising a coupling network, the coupling network including a control bus configured to receive a control signal for biasing one or more antenna selector elements, the antenna selector elements selectively coupling the plurality of antenna elements of the first substrate to the radio frequency feed port.

7. The MIMO antenna apparatus of claim 6, wherein the coupling network includes a series of p-type, intrinsic, n-type (PIN) diodes for selectively coupling the antenna elements of the first substrate to the radio frequency feed port.

8. The MIMO antenna apparatus of claim 5, wherein the coupling network includes a series of gallium arsenide field-effect transistors (GaAs FETs) for selectively coupling the antenna elements of the first substrate to the radio frequency feed port.

9. The MIMO antenna apparatus of claim 7, wherein the coupling network further includes one or more light emitting diodes (LEDs) placed in circuit with an antenna element of the first substrate such that the selection of an associated antenna element on the first substrate illuminates the LED thereby providing a visual indication of antenna element selection.

10. The MIMO antenna apparatus of claim 5, wherein a solder pad on the first substrate is mechanically bonded to a solder pad on the second substrate.

11. The MIMO antenna apparatus of claim 5, wherein the directional radiation pattern of the first substrate and the directional radiation pattern of the second substrate are in different polarizations.

12. The MIMO antenna apparatus of claim 5, wherein the directional radiation pattern of the first substrate and the directional radiation pattern of the second substrate are orthogonal to one another.

13. The MIMO antenna apparatus of claim 5, wherein the radiation pattern of the first substrate and the radiation pattern of the second substrate form a substantially omnidirectional multi-polarized radiation pattern.

14. The MIMO antenna apparatus of claim 5, wherein the one or more parasitic antenna elements are configured to operate as a reflector.

15. The MIMO antenna apparatus of claim 5, wherein the one or more parasitic antenna elements are configured to operate as a director.

16. The MIMO antenna apparatus of claim 5, wherein the one or more parasitic elements are selectively coupled to one another via a switching network, the switching network configured to receive a control signal for coupling one or more of the parasitic elements to each other thereby changing the length of the one or more parasitic elements influencing the directional radiation pattern emitted by the first substrate or the second substrate.

17. The MIMO antenna apparatus of claim 5, wherein the antenna apparatus is situated in a housing at a 45 degree angle.