Abstract:
PROBLEM TO BE SOLVED: To utilize small, narrow-band and frequency adaptable antennas to provide coverage to a wide range of a wireless modem and frequency bands on a host wireless device.SOLUTION: Transmit and receive antennas 302, 303 have narrow pass-band characteristics, require minimal space on a host device, and allow smaller form factor. The frequency tunability further allows a fewer number of transmit and receive antennas 302, 303 to be used. The operation of the transmit and receive antennas 302, 303 may also be adaptably relocated from an unused modem to an in-use modem to maximize performance. These features of the antennas result in cost and size reductions. In another aspect, the antennas may be broadband antennas.
Abstract:
PROBLEM TO BE SOLVED: To provide antenna control techniques to reduce influence of interference.SOLUTION: A station is equipped with antenna elements selectable for use as an omni-directional antenna or one or more directional antennas to select the omni-directional antenna or a directional antenna for communication. The station selects the omni-directional antenna or a directional antenna for use for communication on the basis of various factors such as whether the location or direction of a target station for communication is known and whether control frames or data frames are being exchanged.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for adjusting one or more antenna parameters to optimize performance of a wireless device.SOLUTION: A variable antenna match unit 210 is provided with a control signal 210a for selecting a preferred antenna match setting. The preferred antenna match setting may correspond to a setting having a highest signal quality metric. In another embodiment, in order to accommodate multiple antennas, a variable antenna electrical length module 375 is provided with a control signal 375a for selecting a preferred antenna electrical length.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for adjusting one or more antenna parameters to optimize performance of a wireless device.SOLUTION: A variable antenna match unit 210 is provided with a control signal 210a for selecting a preferred antenna match setting. The preferred antenna match setting may correspond to a setting having a highest signal quality metric. In another embodiment, in order to accommodate multiple antennas, a variable antenna electrical length module 375 is provided with a control signal 375a for selecting a preferred antenna electrical length.
Abstract:
PROBLEM TO BE SOLVED: To provide a way to perform point-to-multipoint transmission using an adaptive or directional antenna while reducing an antenna array pattern distortion. SOLUTION: Generally, rather than transmitting a same waveform to two or more receivers, an information bearing signal is transformed into different decorrelated waveforms and each decorrelated waveform is transmitted to a different receiver. In one implementation, an information bearing signal is transformed into two decorrelated signals S 1 (t), S 2 (t), such that their cross-correlation or auto-correlation of the information bearing signal, is zero or very small. Such decorrelation may be achieved by sending a first signal to a first receiver 104, while sending a second signal with a radio frequency spectrum that is the spectrally inverted version of the first signal to a second receiver 106. In another implementation, a first signal is transmitted to the first receiver 104, and is also transmitted to the second receiver 106 with a time delay. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
An apparatus for wireless charging using radio frequency (RF) energy includes a first charger portion having first and second charging areas. The first and second charging areas are located in a common plane each having at least one coil for wirelessly charging a charge receiving device placed in proximity thereto. The coils include respective windings which are wound in opposing directions each coil being connected in series each coil configured to charge at least one charge receiving device.A second charger portion has a third charging area having at least one coil including a winding for wirelessly charging a charge receiving device placed in proximity to the third charging area the coil in the third charging area being connected in series with the coils in the first and second charging areas the third charging area located in a plane that is orthogonal to the plane of the first and second charging areas.
Abstract:
Techniques for adjusting one or more antenna parameters to optimize the performance of a wireless device are disclosed. In an embodiment, a variable antenna match is provided with a control signal for selecting a preferred antenna match setting. The preferred antenna match setting may correspond to the setting having a best signal quality metric. In a further embodiment, a variable antenna electrical length module is provided with a control signal for selecting a preferred antenna electrical length. Further techniques for accommodating multiple antennas are disclosed.
Abstract:
A dielectric resonator antenna (100) having a resonator (104) formed from a dielectric material mounted on a ground plane (108). The ground plane (108) is formed from a conductive material. First and second probes (112, 116) are electrically coupled to the resonator (104) for providing first and second signals, respectively, to or receiving from the resonator (104). The first and second probes (112, 166) are spaced apart from each other. The first and second probes (112, 116) are formed of conductive strips that are electrically connected to the perimeter of the resonator (104) and are substantially orthogonal with respect to the ground plane (108). The first and second signals have equal amplitude, but 90 degrees phase difference with respect to each other, to produce a circularly polarised radiation pattern. A dual band antenna (200, 220) can be constructed by positioning and connecting two dielectric resonator antennas (204, 208; 224, 228) together. Each resonator (204, 208; 224, 228) in the dual band configuration (200, 220) resonates at a particular frequency, thereby providing dual band operation. The resonators (204, 208; 224, 228) can be positioned either side by side or vertically relative to each other.