Abstract: The present invention provides a power transfer device for charging a wireless communication device having a communication bandwidth, and an associated method of transferring power. The device and method of the invention use a spread-spectrum technique to reduce or minimize interference signals within the communication bandwidth and within the power transfer device.

Abstract: The present invention provides a wideband frequency tunable ring resonator, wherein, comprises a closed ?g/2 transmission line and two variable capacitors with tunable capacitance, the ?g/2 transmission line is axisymmetric around a central line, first ends of the two variable capacitors are respectively connected to two intersection points of the ?g/2 transmission line and the central line, the second ends of the two variable capacitors are respectively grounded. By implementing the technical solution of present invention, following technical effects are obtained. The fundamental resonant frequency (ffund) can be shifted up and down by controlling the respective values of the two loading capacitors, resulting in a bi-directional tuning of ffund. As a result, the tuning range of this invention can be approximately doubled as compared with the conventional tunable ring resonator.

Abstract: A method and apparatus controlling the output phase of a VCO (Voltage Controlled Oscillator). The apparatus has a phase locked loop 20 having a first input 21 for receiving a reference signal and a second input 22 for receiving a feedback signal and the output for controlling of a VCO. A phase shifter 50 is provided on the feedback path between the VCO and the second input of the phase locked loop. The phase shifter is arranged for shifting the phase for feedback signal by controlled amount. The phase shifter may be a variable phase shifter for controlling and varying the amount by which the phase feedback signal is shifted.

Abstract: A patch antenna has a ground plane and a planar antenna plate that are parallel to and spaced from each other. A pair of planar feed plates have feed edges electrically contacting a surface of the antenna plate to couple electromagnetic energy into and/or out of the antenna plate.

Abstract: A source of radiation comprises a first low frequency oscillator 200 for providing a reference signal and a plurality of phase shifters 210a, 210b, 210c coupled to the first oscillator. In addition there are a plurality of phase locked loops 230a, 230b, 230c, each phase locked loop having a respective Voltage Controlled Oscillator (VCO) 240a, 240b, 240c for outputting a signal. Each phased locked loop is coupled to a respective one of the phase shifters, so that in use each VCO is phase locked to a reference signal which has been phase shifted by a respective one of the phase shifters. In this way the phase of the radiation output by each VCO may be controlled indirectly by controlling the phase shift of the reference signal. In a preferred embodiment the phase shifters are adjustable to shift the phase by an adjustable amount.

Abstract: The present invention provides a power transfer device for charging a wireless communication device having a communication bandwidth, and an associated method of transferring power. The device and method of the invention use a spread-spectrum technique to reduce or minimize interference signals within the communication bandwidth and within the power transfer device.

Abstract: A biasing circuit is used to provide low distortion and high efficiency operation of a microwave power amplifier. The biasing circuit utilizes the nonlinear rectified current of a microwave diode or transistor for biasing the amplifying transistor self-adaptively. The biasing current not only reduces the DC bias power during low-power operation and increases self-adaptively during high-power operation, but also manipulates the intermodulation distortion minimum dynamically. Meanwhile, the biasing circuit distorts the input signals with positive gain and negative phase deviations. Therefore, the average power efficiency of the operation is enhanced, the linearity of the input-output characteristic is improved and the radiated level of adjacent channel power is suppressed.

Abstract: The present invention provides a portable electronic device including an antenna having a major planar cross-section, and a power transfer coil having windings parallel to a coil plane, the coil plane extending to the perimeter of the power transfer coil. The antenna and the power transfer coil are arranged such that the major planar cross-section is substantially perpendicular to the coil plane if a line directed perpendicularly from the coil plane intersects the major planar cross-section. An associated method of assembling a portable electronic device is also provided.

Abstract: A reference signal is split and input to first and second variable phase shifters 10, 20. The first and second variable phase shifters output to first and second inputs 31, 32 respectively of a phase comparator 30. Initially, the first and second variable phase shifters 10, 20 are preferably set to the same phase. The first and second phase shifters are then aligned, e.g. by adjusting the calibration of one or both of the phase shifters so that the phase comparator 30 indicates that they output the same phase. The phase of the first phase shifter 10 is then adjusted by one step and a phase delay section 60 is placed between the output of the second phase shifter 20 and the second input 32 of the phase comparator 30. The first and second phase shifters 10, 20 are then aligned again.

Abstract: The present invention provides an antenna network for passively or actively enhancing signal transmission or reception of one or more portable transceiver devices. The antenna network includes one or more antennas, each having a coupling portion and a radiating portion, the coupling portion being distributed across a coupling area and the radiating portion being located away from the coupling area, whereby signal transmission or reception of the one or more portable transceiver devices can occur through the radiating portion when the one or more portable transceiver devices are located within the coupling area.

Abstract: A reference signal is split and input to first and second variable phase shifters 10, 20. The first and second variable phase shifters output to first and second inputs 31, 32 respectively of a phase comparator 30. Initially, the first and second variable phase shifters 10, 20 are preferably set to the same phase. The first and second phase shifters are then aligned, e.g. by adjusting the calibration of one or both of the phase shifters so that the phase comparator 30 indicates that they output the same phase. The phase of the first phase shifter 10 is then adjusted by one step and a phase delay section 60 is placed between the output of the second phase shifter 20 and the second input 32 of the phase comparator 30. The first and second phase shifters 10, 20 are then aligned again.

Abstract: A method and apparatus controlling the output phase of a VCO (Voltage Controlled Oscillator). The apparatus has a phase locked loop 20 having a first input 21 for receiving a reference signal and a second input 22 for receiving a feedback signal and the output for controlling of a VCO. A phase shifter 50 is provided on the feedback path between the VCO and the second input of the phase locked loop. The phase shifter is arranged for shifting the phase for feedback signal by controlled amount. The phase shifter may be a variable phase shifter for controlling and varying the amount by which the phase feedback signal is shifted.

Abstract: A power amplifier includes a bipolar transistor and a self-adaptive bias network situated between an RF input and the base of the bipolar transistor. The self-adaptive bias network suppresses the low frequency even-order intermodulation components. The self-adaptive bias network stabilizes a DC bias voltage to provide a substantially constant base-emitter voltage and provides an increased DC base current with increased input power when the power amplifier is operating within the nonlinear region.

Abstract: A patch antenna has a ground plane and a planar antenna plate that are parallel to and from each other. A pair of planar feed plates have feed edges electrically contacting a surface of the antenna plate to couple electromagnetic energy into and/or out of the antenna plate.

Abstract: A biasing circuit is used to provide low distortion and high efficiency operation of a microwave power amplifier. The biasing circuit utilizes the nonlinear rectified current of a microwave diode or transistor for biasing the amplifying transistor self-adaptively. The biasing current not only reduces the DC bias power during low-power operation and increases self-adaptively during high-power operation, but also manipulates the intermodulation distortion minimum dynamically. Meanwhile, the biasing circuit distorts the input signals with positive gain and negative phase deviations. Therefore, the average power efficiency of the operation is enhanced, the linearity of the input-output characteristic is improved and the radiated level of adjacent channel power is suppressed.

Abstract: A folded dipole antenna that transmits and receives radio frequency waves (RF) waves has two radiating strips that form a dipole. A metallic radiating element is located between the two radiating strips, facilitating an increase in the gain of the antenna. The folded dipole antenna may be used in a wireless communication device.

Abstract: A small transceiver device and antenna system has an insulating layer with first and second surfaces. A transmit loop element having transmit loop segments is formed on the first surface. The transmit loop segments are disposed in a transmit zigzag configuration. A receive loop element having receive loop segments is formed on the second surface. The receive loop segments are disposed in a receive zigzag configuration. Each receive loop segment in the receive zigzag configuration is skewed with respect to a closest transmit loop segment disposed in the transmit zigzag configuration. The transmit loop segments can be grouped in two or more transmit zigzag configurations, and the receive loop segments can be grouped in two or more receive zigzag configurations.

Abstract: A source of radiation comprises a first low frequency oscillator 200 for providing a reference signal and a plurality of phase shifters 210a, 210b, 210c coupled to the first oscillator. In addition there are a plurality of phase locked loops 230a, 230b, 230c, each phase locked loop having a respective Voltage Controlled Oscillator (VCO) 240a, 240b, 240c for outputting a signal. Each phased locked loop is coupled to a respective one of the phase shifters, so that in use each VCO is phase locked to a reference signal which has been phase shifted by a respective one of the phase shifters. In this way the phase of the radiation output by each VCO may be controlled indirectly by controlling the phase shift of the reference signal. In a preferred embodiment the phase shifters are adjustable to shift the phase by an adjustable amount.

Abstract: A power amplifier includes a bipolar transistor and a self-adaptive bias network situated between an RF input and the base of the bipolar transistor. The self-adaptive bias network suppresses the low frequency even-order intermodulation components. The self-adaptive bias network stabilizes a DC bias voltage to provide a substantially constant base-emitter voltage and provides an increased DC base current with increased input power when the power amplifier is operating within the nonlinear region.

Abstract: A small transceiver device and antenna system has an insulating layer with first and second surfaces. A transmit loop element having transmit loop segments is formed on the first surface. The transmit loop segments are disposed in a transmit zigzag configuration. A receive loop element having receive loop segments is formed on the second surface. The receive loop segments are disposed in a receive zigzag configuration. Each receive loop segment in the receive zigzag configuration is skewed with respect to a closest transmit loop segment disposed in the transmit zigzag configuration. The transmit loop segments can be grouped in two or more transmit zigzag configurations, and the receive loop segments can be grouped in two or more receive zigzag configurations.