Wireless communication antennae for concurrent communication in an access point

Abstract

One or more access points in a wireless communication system, wherein at least one of those access points includes a set of more than one antennae capable of concurrent communication, and at least one of those more than one antennae is isolated from a remainder of that set of antennae during concurrent communication. Isolation includes one or more of disposed a first antenna in a null region of a second antenna, disposing a first antenna to communicate polarized and substantially orthogonal to a second antenna, disposing a set of antennae to communicate at two or more carrier frequencies, wherein each first antenna adjacent to a second antenna operate at distinct such carrier frequencies, or disposing a set of antennae to communicate using two or more substantially distinct protocols, wherein substantially each first antenna adjacent to a second antenna operate at substantially distinct such protocols.

Claims

1. An access point with multiple antennae for concurrent communication in a wireless network, comprising: a first enclosure having inside a first set of antennae and a second set of antennae located in a null region of the first set; and a second enclosure having inside at least two scanning antennae to locate stations in the wireless network and operating concurrently with the first and second sets of antennae at distinct frequencies and located in the second enclosure, wherein the second enclosure is independently rotatable from the first enclosure on at least two axes to reduce interference between the at least two scanning antennae and the first and second set of antennae.

2. The access point of claim 1, wherein the first enclosure is rotated parallel relative to the second enclosure to mate the first enclosure and second enclosure.

3. The access point of claim 1, wherein the first enclosure is rotated perpendicular relative to the first enclosure to a position that the first enclosure and second enclosure are perpendicular in two directions.

4. The access point of claim 1, comprising a hinge to enable independent rotation between the first and second enclosures.

5. The access point of claim 1, wherein the multiple antennae comprise multiple MIMO (multiple input/multiple output) antennae.

6. The access point of claim 1, wherein the access point operates according to IEEE 802.11n.

7. The access point of claim 1, wherein the access point is attachable to a wall.

8. An access point with multiple antennae for concurrent communication in a wireless network, comprising: a first set of antennae; a second set of antennae located adjacent to the first set of antennae and in a null region of the first set of antennae and concurrently communicates relative to the first set of antennae; and a third set of antennae located adjacent to the second set of antennae, apart from the first set of antennae, and in a null region of the second set of antennae, communicating using a protocol and frequency in common with the first set of antennae, the first, second and third sets of antennae located in a first enclosure; and at least two scanning antennae to locate stations operating concurrently with the first, second and third sets of antennae located in a second enclosure, wherein the second enclosure is independently rotatable from the first enclosure on at least two axes to reduce interference between the at least two scanning antennae and the first, second and third sets of antennae.

Description

DETAILED DESCRIPTION

(1) FIG. 1 shows a conceptual diagram of an example wireless communication system.

(2) FIG. 2 shows a 1.sup.st conceptual view of a structure housing a possible access point.

(3) FIG. 3 shows a 2.sup.nd conceptual view of a structure housing a possible access point.

(4) FIG. 4 shows a 3.sup.rd conceptual view of a structure housing a possible access point.

(5) FIG. 5 shows a conceptual view of a possible enclosure in one of the structures shown in the FIG. 2, the FIG. 3, or the FIG. 4.

(6) FIG. 6 shows a conceptual view of a possible rotational position between the 1.sup.st enclosure and the 2.sup.nd enclosure.

(7) FIG. 7 shows a conceptual view of a possible rotational position between the 1.sup.st enclosure and the 2.sup.nd enclosure.

(8) FIG. 8 shows an arrangement of antenna parts with selected polarization orientations.

(9) FIG. 9 shows a conceptual view of a possible radiation pattern, including possible active regions and possible null regions.

(10) FIG. 10 shows a conceptual view of a signal filter element.

(11) FIG. 11 shows a conceptual view of a signal modulation element.

(12) FIG. 12 shows a conceptual diagram of an example process flow used in an example wireless communication system.

FIGURES AND TEXT

(13) FIG. 1

(14) FIG. 1 shows a conceptual diagram of an example wireless communication system.

(15) The FIG. 1 shows elements of an example wireless communication system, including at least an antenna array system 10, operating in an environment 12, operating in a wireless communication system 14.

(16) For example and without limitation, the wireless communication system 14 might include a wireless communication network, in which wireless devices 16 can communicate. For example and without limitation, the wireless communication system 14 might use one of, or a variant of, IEEE standard 802.11, possibly including variants thereof, such as for example 802.11a, 802.11b, 802.11g, 802.11n, or any other similar protocol, or variant thereof.

(17) Although this description is primarily directed to networks or systems using IEEE standards 802.11, and variants thereof, in the context of the invention, there is no particular reason for any such limitation.

(18) The environment 12 might include any location where wireless device users might gather, such as for example, an airport, a cafe, a house, a lecture hall, a library, or the like. Alternatively, the environment 12 might include outdoor settings, such as for example, a college campus, a park, a town square, or the like. Accordingly, distinct environments 12 and the number of users might differ significantly. Each such environment 12 might have substantially distinct physical characteristics affecting communication, such as for example, signal attenuation regions, signal reflecting surfaces, and the like.

(19) The wireless devices 16 might include any electronic device capable of wirelessly sending or receiving information signals, as for example described above. Although this description is primarily directed to EMF signals, and in particular to RF (radio frequency) operation, in the context of the invention, there is no particular reason for any such limitation.

(20) The wireless devices 16 might be mobile, such as for example, a laptop computer. However, other devices that are stationary in normal operation, such as a desktop computer with a wireless network interface card might also be considered wireless devices 16. Hand-held devices, such as cell phones, personal digital assistants (PDAs), palmtop computers, and the like, that include RF transmitters and receivers might also be considered wireless devices 16.

(21) The system 10 might allow more than one wireless device user to concurrently use the network 14.

(22) The system 10 might act to couple wireless devices and a wire-line network 18. The wire-line network 18 might include one or more architectures, protocols, topologies, and the like, such as for example, a local area network, a metro area network, a wide area network, an extranet, an intranet, an internet. The system 10 might couple data from wireless devices to the wired network 18.

(23) FIG. 2

(24) FIG. 2 shows a 1.sup.st conceptual view of a structure housing a possible access point.

(25) As shown in the FIG. 2, the FIG. 3, and the FIG. 4, a possible access point might be housed at least partly within a structure 46, having parts as shown in the figures and including at least a 1.sup.st enclosure 48, a 2.sup.nd enclosure 50, and an hinge component 52.

(26) One example of such a structure 46 is shown, at least in part, in U.S. Provisional Application No. 61/052,981, filed May 13, 2008, in the name of inventors Sid Gilbrech, Rajendran Venugopalachary, and Srinivas Sivaprakasam, and assigned to the same assignee, titled “Omni-Directional Flexible Antenna Support Panel”, hereby incorporated by reference as if fully set forth herein. The Examiner is requested to take notice that this earlier provisional patent application is incorporated by reference into this regular patent application, by virtue of the claim to priority and incorporation by reference of U.S. application Ser. No. 12/465,537, filed May 13, 2009, now issued U.S. Pat. No. 8,344,953, in the name of the same inventors, co-pending with this regular patent application. This instant application claims priority of this latter regular patent application, and incorporates it by reference as if fully set forth herein.

(27) For example and without limitation, an access point, as housed at least partly within the structure 46, might include four or more radios, including one or more scanning radios (with the effect that the access point can determine whether a particular channel is in use) and three or more communication radios.

(28) One or more of the scanning radios, such as for example, each of them, might include two or more scanning antennae, disposed, such as for example, in a base portion of the structure 46, i.e., within the 1.sup.st enclosure of the structure 46.

(29) One or more of the communication radios, such as for example, each of them, might include a plurality of antennae, such as for example (and as shown in the figures), three or more patch antenna parts for each such communication radio. The communication radios might be disposed in a movable portion, i.e., within a 2.sup.nd enclosure of the structure 46, such as for example (and as shown in the figures) in a 3×3 arrangement. The 2.sup.nd enclosure might be coupled to the 1.sup.st enclosure using, at least in part, a universal hinge part. As shown in the figures, in such cases in which the communication radios are disposed in a 3×3 arrangement, each set of antenna parts might be disposed in a selected row, with the effect that each row of the 3×3 arrangement is collectively included in a corresponding one of the communication radios.

(30) The IEEE 802.11 family of standards differ sufficiently from each other that operation of one such standard, e.g., 802.11b, can interfere with operation of another such standard using a relatively nearby antenna. For example and without limitation, legacy systems, using standards such as 802.11a or 802.11b, can substantially affect operation of antennae using the relatively newer 802.11n standard.

(31) In such cases, each such communication antenna might be disposed with a middle-row communication antenna being selected for use with IEEE standard 802.11b or 802.11g, while the two outer rows being selected for use with IEEE standard 802.11a (e.g., on a 1.sup.st side) or for use with IEEE standard 802.11n (e.g., on a 2.sup.nd side).

(32) FIG. 3

(33) FIG. 3 shows a 2.sup.nd conceptual view of a structure housing a possible access point.

(34) As shown in the FIG. 3 and the FIG. 4, the 1.sup.st enclosure 48 might include a 1.sup.st circuit board 34, and the 2.sup.nd enclosure might include a 2.sup.nd circuit board 36. The 1.sup.st circuit board 34 and the 2.sup.nd circuit board 36 might collectively provide for mounting or otherwise affixing antennae, circuits, shielding, and possibly other components for the system 10.

(35) The system 10 might include one or more scanning antennae 20, one or more antenna patches 26, such as for example, antenna patches 28 and 30 (shown in the FIG. 3), and one or more shielding structures 32.

(36) The FIG. 10, also described below, shows some possible elements that might function with these antenna parts. These possible elements include elements as shown in the FIG. 10, including at least a signal filter element 38, a signal modulation element 40, a network interface element 42, and a processing element 44.

(37) The signal filter element 38, the signal modulation element 40, and the network interface element 42 might be mounted on the 1.sup.st circuit board 34, the combination of which might be housed in the 1.sup.st enclosure 48.

(38) Alternatively, the 1.sup.st enclosure might be disposed as shown in the FIG. 5. The antenna parts 26 (including antenna parts 28 and 30) and shielding structures 32 might be mounted on the 2.sup.nd circuit board 36, which might be collectively disposed at least partly within the 2.sup.nd enclosure 50.

(39) FIG. 4

(40) FIG. 4 shows a 3.sup.rd conceptual view of a structure housing a possible access point.

(41) As seen in the FIG. 4, the hinge component 52 might allow the 2.sup.nd enclosure 50 to rotate approximately 180° about a 1.sup.st axis 54 along an edge of the 1.sup.st enclosure 48. The 2.sup.nd enclosure 50 might also rotate approximately 360° about a 2.sup.nd axis 56 along an edge of the 2.sup.nd enclosure 50, with the effect that the 1.sup.st axis 54 can be disposed substantially orthogonal to the 2.sup.nd axis 56. This has the effect that the 2.sup.nd enclosure 50 can be oriented at a substantial range of angles with respect to the 1.sup.st enclosure 48. The 1.sup.st enclosure 48 might be placed or mounted on a stationary object, such as a tabletop, a ledge, a wall, or a ceiling.

(42) FIG. 5

(43) FIG. 5 shows a conceptual view of a possible enclosure in one of the structures shown in the FIG. 2, the FIG. 3, or the FIG. 4.

(44) The possible enclosure includes elements as shown in the FIG. 5, including at least one or more scanning antennae 20 (each of which might itself include a 1.sup.st scanning antenna 22 and a 2.sup.nd scanning antenna 24), a 1.sup.st circuit board 34 (as described herein), a 1.sup.st enclosure 48 (as described herein), and a hinge component 52.

(45) FIG. 6

(46) FIG. 6 shows a conceptual view of a possible rotational position between the 1.sup.st enclosure and the 2.sup.nd enclosure.

(47) With the 1.sup.st enclosure 48 properly positioned, the antenna patches 26 might be oriented by rotating the 2.sup.nd enclosure 50 about the 1.sup.st axis 54, the 2.sup.nd axis 56, or both. Rotational positions between the 2.sup.nd enclosure 50 and the 1.sup.st enclosure 48 are shown in the FIG. 6 and the FIG. 7. The antenna patches 26 might be disposed to maximize signal coverage and throughput of the wireless communication network 14.

(48) The scanning antennae 20 might scan for wireless signals associated with one or more carrier frequencies. In one embodiment, the scanning antennae 20 include a 1.sup.st scanning antenna and a 2.sup.nd scanning antenna 22, 24. The scanning antennae 20 search for wireless devices 16 that are transmitting but have not yet established a link with the access point antenna array system 10. In certain embodiments, the access point antenna array system 10 might be utilized in an IEEE 802.11 network. Thus, the carrier frequencies might include a 1.sup.st frequency of 2.4 GigaHertz (GHz) and a 2.sup.nd frequency of 5 GHz.

(49) The 1.sup.st scanning antenna 22 might operate at the 1.sup.st carrier frequency and might be located on one side of the 1.sup.st enclosure 48. The 2.sup.nd scanning antenna 24 might operate at the 2.sup.nd carrier frequency and might be located on the opposite side of the 1.sup.st enclosure 48 as shown in FIG. 5 with respect to antenna array system 20. This placement in the 1.sup.st enclosure 48 offers spatial separation and signal isolation between the 1.sup.st and 2.sup.nd scanning antennae 22, 24. This or another arrangement can be used to mount such scanning antennae on antenna array system 10.

(50) The antenna patches 26 might include one or more antennae 94 to transmit and receive wireless signals at one or more carrier frequencies. The individual antennae 94 might be square or rectangular-shaped and might be sized according the carrier frequency at which they radiate. Antennae 94 designed to operate at lower carrier frequencies might be larger in size than antennae 94 designed to operate at higher carrier frequencies. In certain embodiments, the access point antenna array system 10 might be utilized in an IEEE 802.11 network. Accordingly, some antennae 94 might be sized to operate at the 1.sup.st carrier frequency of 2.4 GHz and some might be sized to operate at the 2.sup.nd carrier frequency of 5 GHz. In various embodiments, the 5 GHz carrier frequency might include a plurality of subband carrier frequencies, with frequencies of 4.9 GHz, 5.185 GHz, 5.47 GHz, and 5.725 GHz. Each subband carrier frequency might include its own antenna 94. To conserve the space required for multiple antennae, the subband antennae might be stacked, one on top of another, according to size and carrier frequency, with the lowest frequency and largest sized antenna 94 on the bottom of the stack and the highest frequency and smallest sized antenna 94 on the top of the stack.

(51) FIG. 7

(52) FIG. 7 shows a conceptual view of a possible rotational position between the 1.sup.st enclosure and the 2.sup.nd enclosure.

(53) The antenna patches 26 might be divided into a plurality of groups based on the fundamental carrier frequency at which they operate. In certain embodiments, the antenna patches 26 might be divided into a 1.sup.st group associated with the 1.sup.st carrier frequency and a 2.sup.nd group associated with the 2.sup.nd carrier frequency. The antenna patches 26 of a given group might be placed on the 2.sup.nd circuit board 36 in close proximity of each other, between approximately 1 inch to approximately 3 inches, but separated from antenna patches 26 of another group. The antenna patches 26 within a group might be placed in a pattern, such as a horizontal, vertical, or diagonal line, as shown in the FIG. 3 and the FIG. 8. The 1.sup.st and 2.sup.nd groups might be arranged on the 2.sup.nd circuit board 36 in an alternating fashion, such that a 1.sup.st group of antenna patches 28 is positioned adjacent to a 2.sup.nd group of antenna patches 30 and not positioned next to another 1.sup.st group. Likewise, a 2.sup.nd group of antenna patches 30 is positioned next to a 1.sup.st group of antenna patches 28 only. In various embodiments, the antenna patches 26 might mounted to both sides of the 2.sup.nd circuit board 36, using the techniques as described above. Placement of the array of antenna patches 26 on the 2.sup.nd circuit board 36 in the 2.sup.nd enclosure 50 also establishes separation of the antenna patches 26 from the scanning antennae 20, located on opposite sides of the 1.sup.st enclosure 48.

(54) The shielding structures 32 provide signal isolation between the 1.sup.st and 2.sup.nd groups of antenna patches 28, 30. Each shielding structure 32 might be formed from an elongated strip of grounded electrically conductive material, such as copper or other metals. Once the 1.sup.st and 2.sup.nd groups of antenna patches 28, 30 are placed on the 2.sup.nd circuit board 36, as discussed above, the shielding structures 32 are placed on the circuit board 36 in between the 1.sup.st and 2.sup.nd groups 28, 30. In certain embodiments, such as the one shown in FIGS. 3 and 8, the shielding structure 32 might be formed from a thin strip of copper that is mounted to the 2.sup.nd circuit board 36. Mounting techniques might include soldering, as is known in the art. The length of the shielding structure 32 might match one of the planar dimensions of the circuit board 36, such as the width, and the height might be sufficient to provide signal isolation without causing interference with the 2.sup.nd enclosure 50. In various embodiments, the shielding structures 32 might be mounted on both sides of the 2.sup.nd circuit board 36 using the techniques as described above.

(55) FIG. 8

(56) FIG. 8 shows an arrangement of antenna parts with selected polarization orientations.

(57) Each antenna patch 26 might be polarized with a 1.sup.st polarization 58 or a 2.sup.nd polarization 60, that is generally orthogonal to the 1.sup.st polarization 58, as shown in FIG. 8. In certain embodiments, the 1.sup.st polarization 58 might be a vertical, or up/down, polarization, and the 2.sup.nd polarization 60 might be a horizontal, or left/right, polarization, or vice versa. Alternatively, the 1.sup.st polarization 58 might be along a diagonal 62, e.g. NE/SW or NW/SE, and the 2.sup.nd polarization 60 might be along an orthogonal diagonal 64, e.g. NW/SE or NE/SW, respective to the 1.sup.st polarization 58. In other embodiments, a circular polarization might also be utilized. When placing antenna patches 26 within a group on the 2.sup.nd circuit board 36, an antenna patch 26 of the 1.sup.st polarization 58 is placed adjacent to an antenna patch 26 of the 2.sup.nd polarization 60 in an alternating pattern.

(58) FIG. 8

(59) FIG. 8 shows an arrangement of antenna parts with selected polarization orientations.

(60) Each antenna patch 26 might be polarized with a 1.sup.st polarization 58 or a 2.sup.nd polarization 60, that is generally orthogonal to the 1.sup.st polarization 58, as shown in FIG. 8. In certain embodiments, the 1.sup.st polarization 58 might be a vertical, or up/down, polarization, and the 2.sup.nd polarization 60 might be a horizontal, or left/right, polarization, or vice versa. Alternatively, the 1.sup.st polarization 58 might be along a diagonal 62, e.g. NE/SW or NW/SE, and the 2.sup.nd polarization 60 might be along an orthogonal diagonal 64, e.g. NW/SE or NE/SW, respective to the 1.sup.st polarization 58. In other embodiments, a circular polarization might also be utilized. When placing antenna patches 26 within a group on the 2.sup.nd circuit board 36, an antenna patch 26 of the 1.sup.st polarization 58 is placed adjacent to an antenna patch 26 of the 2.sup.nd polarization 60 in an alternating pattern.

(61) FIG. 9

(62) FIG. 9 shows a conceptual view of a possible radiation pattern, including possible active regions and possible null regions.

(63) Each antenna patch 26 might have a radiation pattern with active radiating regions 66 and null radiating regions 68 in the space around the antenna patch 26, as seen in FIG. 9. The active region 66 is the space in which the antenna is radiating and the null region 68 is generally everywhere else. The antenna patches 26 might be oriented on the circuit board such that the active radiating region 66 of one antenna patch 26 is located in the null region 68 of an adjacent antenna patch 26 to reduce signal interference from one antenna patch 26 to another antenna patch 26.

(64) FIG. 10

(65) FIG. 10 shows a conceptual view of a signal filter element.

(66) The signal filter element 38 generally filters signals at the 1.sup.st carrier frequency. As seen in the FIG. 10, the signal filter element 38 might include a plurality of low-pass filter circuits 70 and a plurality of band-pass filter circuits 72. Both filter circuits 70, 72 might include analog or digital circuitry or combinations thereof. The filter circuits 70, 72 might be formed from discrete passive and active components, fully-custom or semi-custom application-specific integrated circuits (ASICs), digital signal processing circuits (DSPs), microprocessors, microcontrollers, field-programmable gate arrays (FPGAs), and the like, or combinations thereof.

(67) Wireless signals are received by the antenna patches 26 and forwarded to the signal filter element 38. Typically, the 1.sup.st carrier frequency is lower than the 2.sup.nd carrier frequency so that signals modulated at the 2.sup.nd carrier frequency can be filtered out by the low-pass filter 70 whose cutoff frequency is designed to be less than the 2.sup.nd frequency. In certain embodiments, the access point antenna array system 10 might be used with an IEEE 802.11 system, so that the 2.sup.nd frequency might be 5 GHz, thus the cutoff frequency of the low-pass filter 70 might be approximately 3 GHz. The low-pass filtered signal is forwarded to the band-pass filter 72, which might help to filter noise and other undesirable effects on the signal. In certain embodiments, the center frequency of the band-pass filter 72 might be the 1.sup.st carrier frequency, which for IEEE 802.11 might be approximately 2.4 GHz. The output of the band pass filter 72 is forwarded to the network interface element 42.

(68) FIG. 11

(69) FIG. 11 shows a conceptual view of a signal modulation element.

(70) The signal modulation element 40 generally modulates the signals at the 1.sup.st and 2.sup.nd carrier frequencies. The signal modulation element 40, shown in the FIG. 11, includes a plurality of power amplifiers 74, a plurality of modulators 80, and a plurality of switches 92. The power amplifier 74 might include analog or digital circuitry or combinations thereof, and might be formed from discrete passive and active components, fully-custom or semi-custom ASICs, or combinations thereof. The modulators 80 might include analog or digital circuitry or combinations thereof, and might be formed from discrete passive and active components, fully-custom or semi-custom ASICs, DSPs, microprocessors, microcontrollers, FPGAs, and the like, or combinations thereof. The switches 92 might include analog or digital circuitry or combinations thereof, and might be formed from discrete passive and active components.

(71) The signal modulation element 40 might be forwarded data from the network interface element 42 to be transmitted wirelessly at either the 1.sup.st or the 2.sup.nd carrier frequencies. In certain embodiments, the access point antenna array system 10 might be used in an IEEE 802.11 system. Thus, the 1.sup.st carrier frequency might be 2.4 GHz and the 2.sup.nd carrier frequency might be 5 GHz with subband carrier frequencies at 4.9 GHz, 5.185 GHz, 5.47 GHz, and 5.725 GHz.

(72) As seen in the FIG. 11, the signal might be amplified by a 1.sup.st amplifier 76 for a 2.4 GHz signal or a 2.sup.nd amplifier 78 for a 5 GHz signal. From the 1.sup.st amplifier 76, the signal is modulated by a 1.sup.st modulator 82 that is connected to a 2.4 GHz antenna. From the 2.sup.nd amplifier 78, the signal is modulated by 2.sup.nd, third, fourth, and fifth modulators 84, 86, 88, 90 to modulate at 4.9 GHz, 5.185 GHz, 5.47 GHz, and 5.725 GHz, respectively. Each of these modulators 84, 86, 88, 90 is connected through a single-pole, single-throw type switch 92 to an antenna patch stack 26, wherein the 2.sup.nd modulator 84 is connected to the lowest antenna 94 and the fifth modulator 90 is connected to the highest antenna 94. The output of the modulators 80 might pass to an antenna patch 26 if the switch 92 is closed, or might be blocked if the switch 92 is open.

(73) The network interface element 42 generally manages data flow between the signal filter 38 and signal modulation elements 40 and the wired network 18. The network interface element 42 might receive data from the wired network 18 and forward a corresponding signal to the signal modulation element 40. The network interface element 42 might also receive a signal from the signal filter element 38 and forward corresponding data to the wired network 18. The network interface element 42 might include one or more components to process data and generate and receive signals for one or more layers of the transmission control protocol/Internet protocol (TCP/IP) layering model, particularly the data link layer and the physical layer. The network interface element 42 might include analog or digital circuitry or combinations thereof, and might be formed from discrete passive and active components, fully-custom or semi-custom ASICs, DSPs, microprocessors, microcontrollers, FPGAs, and the like, or combinations thereof. The network interface element 42 might couple to wired networks 18 of varying protocols, topologies, and architectures, as well as physical media, such as coaxial cable and shielded or unshielded twisted pair cable. Furthermore, the network interface element 42 might include optical receiving and driving components in order to couple with optical fiber.

(74) The processing element 44 controls and monitors the operations of the signal filter element 38, the signal modulation element 40, and the network interface element 42. The processing element 44 might also establish the timing of various receiving and transmitting events. The processing element 44 might include analog or digital circuitry or combinations thereof. The processing element 44 might also be described in one or more code segments of a hardware description language, such as VHDL or Verilog, and might be implemented in fully-custom or semi-custom ASICs, DSPs, microprocessors, microcontrollers, FPGAs, other programmable logic devices, and the like, or combinations thereof.

(75) FIGS. 12A-12B

(76) FIGS. 12A-12B shows a conceptual diagram of an example process flow used in an example wireless communication system.

(77) Some steps 100 of a method of maximizing signal throughput in a multiple-input, multiple-output wireless communication network 14 utilizing various embodiments of the access point antenna array system 10 is shown in FIGS. 12A-12B. The steps 100 as shown in FIGS. 12A-12B do not imply an order of execution. Some steps might be performed concurrently with or before other steps as shown in the flow diagram.

(78) In step 102, a plurality of scanning antennae 20 is positioned, wherein the scanning antennae 20 scan for signals associated with a 1.sup.st carrier frequency and a 2.sup.nd carrier frequency.

(79) In step 104, a plurality of antenna patches 26 is divided into a 1.sup.st group 28 associated with a 1.sup.st carrier frequency and a 2.sup.nd group 30 associated with a 2.sup.nd carrier frequency. Typically, the 1.sup.st carrier frequency is less than the 2.sup.nd carrier frequency. In certain embodiments, the access point antenna array system 10 is utilized in an IEEE 802.11 system, wherein the 1.sup.st carrier frequency is 2.4 GHz and the 2.sup.nd carrier frequency is 5 GHz.

(80) In step 106, the scanning antennae 20 are positioned away from the antenna patches 26 to avoid interference between the antenna patches 26 and the scanning antennae 20.

(81) In step 108, the 1.sup.st and 2.sup.nd groups of antenna patches 28, 30 are mounted on a circuit board 36.

(82) In step 110, the antenna patches 26 within a group are positioned in close proximity of each other, typically in a pattern, such as a horizontal, vertical, or diagonal line.

(83) In step 112, the groups are arranged such that a 1.sup.st group is adjacent to a 2.sup.nd group only and a 2.sup.nd group is adjacent to a 1.sup.st group only in an alternating pattern. One or more shielding structures 32 is mounted on the circuit board 36 between the 1.sup.st and 2.sup.nd groups of antenna patches 28, 30 in step 114. The shielding structures 32 might be sized to match one of the planar dimensions of the circuit board 36, such as the length or width.

(84) In step 116, a portion of the antenna patches 26 might be polarized with a 1.sup.st polarization 58.

(85) In step 118, a portion of the antenna patches 26 might be polarized with a 2.sup.nd polarization 60. Generally, the 1.sup.st polarization 58 is orthogonal to the 2.sup.nd polarization 60. For example, the 1.sup.st polarization 58 might be a vertical, or up/down, polarization, and the 2.sup.nd polarization 60 might be a horizontal, or left/right, polarization, or vice versa.

(86) In step 120, the antenna patches 26 of the 1.sup.st polarization 58 are positioned next to antenna patches 26 of the 2.sup.nd polarization 60 in an alternating fashion.

(87) In step 122, the active radiating region 66 of one antenna patch 26 is oriented to occupy the null region 68 of an adjacent antenna patch 26. This step might be performed while mounting the antenna patches 26 to the circuit board.

(88) In step 124, the signals received by the access point antenna array system 10 might be filtered by a low-pass filter 70 followed by a band-pass filter 72. The low-pass filter 70 might have a cutoff frequency that is less than the 2.sup.nd carrier frequency, thereby filtering out signals of the 2.sup.nd carrier frequency. The band-pass filter 72 might have a center frequency of approximately the 1.sup.st carrier frequency. In certain embodiments, the 1.sup.st and 2.sup.nd carrier frequencies might be those used in an IEEE 802.11 system, which are 2.4 GHz and 5 GHz, respectively.

(89) In step 126, signals might be remodulated near the 2.sup.nd carrier frequency into a plurality of sub-band frequencies, utilizing a power amplifier 74, a plurality of modulators 80, and a plurality of switches 92. Signals are amplified by the power amplifier 74 and modulated by the plurality of modulators 80. Some modulators modulate below the 2.sup.nd carrier frequency, and others modulate above the 2.sup.nd carrier frequency. The signals from the modulators might be forwarded to a plurality of switches 92, which might block the signals from the antenna patches 26 or pass the signals to the antenna patches 26.

(90) Alternative Techniques

(91) After reading this application, those of ordinary skill in the art would recognize that the scope and spirit of the invention is not limited in any way by the specific examples described herein, and that further and other techniques would not require undue experimentation or new invention.