246results about How to "Eliminate coupling" patented technology

An array antenna apparatus includes a first feeding element having a first feed point, a second feeding element having a second feed point, and a first parasitic element electrically connected to the respective first and second feeding elements. In a first frequency band, respective resonances in the feeding elements occur independent of each other, by eliminating electromagnetic mutual coupling between the feeding elements, and exciting the first feeding element through the first feed point as well as exciting the second feeding element through the second feed point. In a second frequency band lower than the first frequency band, a loop antenna having a certain electrical length is formed by the first and second feeding elements and the first parasitic element, and a resonance of the loop antenna substantially occurs by exciting the first feeding element through the first feed point.

Systems and methods which utilize a symmetrical partially coupled microstrip slot feed patch antenna element configuration to provide highly decoupled dual-polarized wideband patch antenna elements are shown. Embodiments provide a microstrip slot feed configuration in which a slot of a first signal feed is centered with respect to the patch and further provide a microstrip slot feed configuration in which slots of a second signal feed are symmetrically disposed with respect to the center of the patch and at positions near the edges of the patch. The microstrip feed utilized in communicating signals with respect to the slots of the second signal feed is adapted to provide signals of substantially equal amplitude and 180° out of phase with respect to each other according to embodiments. The second signal feed configuration utilized according to embodiments provides partial coupling between the patch and the second signal feed.

The present invention provides a two-cycle half-page read scheme by dividing whole NAND array bit lines (BLs) into an odd-BL group and an even-BL group. During the half-plane reading of NAND cells in the odd(even)-BL group, the half-plane even(odd)-BL group acts as the shielding BLs to protect over the odd(even)-BL string reading so that each half-page read operation is substantially reliable and free from BL coupling noise effect. Additionally, each half-page read operation is preferably divided into 3 periods: the first being a bias-condition setup period of the selected WL and remaining control signals; the second being a pre-charge period for all BLs; and the third being a half-page flash data sensing period.

A system and method of digitally modeling and significantly reducing the direct coupling between a telephone appliance loudspeaker and microphone employs a handset microphone in a phone appliance, such as, for example, a speakerphone, as a reference channel along with the speakerphone microphone to reduce the direct coupling between the speakerphone loudspeaker and the speakerphone microphone. Using an analog adaptive echo cancellation scheme, the sensitivity and dynamic range of a telephone device microphone to speech from talkers in an enclosure but not from signals emitted by a telephone loudspeaker are enhanced. Nonlinear distortions produced by a telephone appliance loudspeaker are measured by a telephone appliance handset microphone and used in a feedback subsystem, e.g., network, to reduce nonlinear distortions in the telephone appliance loudspeaker and loudspeaker driving circuit.

A high-frequency BGA device (500) with the chip (501) assembled by metal bumps (503) on an insulating substrate (502) with conductive vias (505) and metal traces (504). Chip bumps which serve the high frequency signal terminals are attached directly to the lands (510) on the vias in order to minimize parasitic electrical parameters such as inductance, resistance, and IR drops, thus achieving the required 0.1 nH inductance for each chip terminal. Chip bumps which serve the remaining chip terminals are attached to pads on certain substrate traces. In both cases, the bumps can be attached reliably because the lands on the vias and the pads on the traces are plated with additional metal layers (511, 512), which provide extra thickness as well as a metallurgically suitable surface.

The invention relates to a permanent magnet bias inner rotor radial magnetism bearing that is made up of out magnetizer, out magnetism separator, exciting winding, inner magnetizer, rotor iron core. Four stator iron cores form four magnetic poles and are connected with each other by out magnetism separator. Eight stator iron core forms eight magnetic poles and every stator magnetic pole has exciting winding. Outside the stator iron core is out magnetizer that is connected to stator iron core. The permanent magnet is located between the two out magnetizers. Inner the stator iron core is rotator iron core. And there is clearance between the inner surface of the stator iron core and the out surface of the rotator iron core. The second clearance exists between the out magnetizer and the permanent magnet to form electric excitation circuit. The invention has the advantage of reliability and easy to be controlled.

Methods and apparatus for sensing a physical substance, in which the physical substance is positioned in close proximity to a first surface of at least one surface plasmon enhanced illumination apparatus. The first surface is irradiated with electromagnetic radiation, and a change in a resonance condition of the at least one surface plasmon enhanced illumination apparatus due to the physical substance is detected.

An interposer for optically coupling an optical device (OD) to a fiber, the OD mounted on a substrate, the interposer comprising: (a) a lens component comprising at least one lens for optically coupling with the OD the lens having a first optical axis, a first surface for mating with the substrate, and a second surface for mating with a third surface of a fiber component; (b) the fiber component comprising the third surface and a cavity for receiving at least one fiber and holding the fiber along a second optical axis, the first and second optical axes being perpendicular; and (c) wherein at least one of the lens component or the fiber component comprises a reflective surface for optically coupling the lens to a point along the second optical axis and adjacent the cavity.

The invention discloses a spatial three-dimensional micro-displacement precise positioning device which comprises a fixed base and a moving table, wherein the moving table is connected with the fixed base through three connecting mechanisms having a displacement amplifying function and other two connecting mechanisms arranged oppositely respectively; the other two connecting mechanisms play the effect of displacement decoupling and enhance the rigidity of a platform; the connecting mechanisms having the displacement amplifying function amplify piezoelectric ceramic output displacement by a piezoelectric ceramic driver and a secondary cascaded lever amplification mechanism which is arranged symmetrically, so that the working stroke of the positioning device is enlarged and the displacement decoupling function can be realized.

The invention relates to a sensor and particularly relates to safe force-coupling-free six-dimensional force sensor, which solves the problem that the dynamic response characteristic and the measurement accuracy of a resistive strain gauge sensor six-dimensional force sensor are reduced because a force coupling phenomenon exists in the sensor. The safe force-coupling-free six-dimensional force sensor comprises an upper plate, a lower plate, two supporting blocks, two elastic bodies for measuring Fx, two elastic bodies for measuring Fy, two elastic bodies for measuring Fz and two force guide bars. One elastic body for measuring Fx, one elastic body for measuring Fy and one elastic body for measuring Fz are arranged on the external side of each supporting block. The two force guide bars areabreast arranged between the two supporting blocks and are arranged perpendicular to the two supporting blocks. Four first strain gauges are stuck on each of two external side surfaces of each elastic body for measuring Fx, four second strain gauges are stuck on each of two ends of each elastic body for measuring Fy and four third strain gauges are stuck on each of two ends of each elastic body for measuring Fz. The safe force-coupling-free six-dimensional force sensor is used for accurately detecting six-dimensional information in real time.

To provide a technique for sufficiently eliminating magnetic coupling between RF coils and improving image quality when a multi-element multi-tuned RF coil is used as a receive RF coil for an MRI device. In the invention, each of RF coils which constitute a multi-element multi-tuned RF coil which is used as a receive RF coil for an MRI device is provided with an inter-coil magnetic coupling prevention circuit which resonates at each frequency to which each RF coil is tuned and provides a high impedance. The inter-coil magnetic coupling prevention circuit adjusts an inductor and a capacitor so that both of a circuit on the side of a pre-amplifier viewed from both ends of a signal reception circuit and a circuit on the side of the signal reception circuit viewed from both ends of a serial resonance circuit connected to the pre-amplifier resonate at a plurality of frequencies to which the respective RF coils are tuned.

The invention discloses an adaptive inverse control system for a chemical-mechanical polishing machine, which comprises a target pressure input device used for inputting target pressure of a polishing head chamber to a compound control device, a neural network identification device used for identifying a control model of a system based on the input pressure of the polishing head chamber input by the compound control device and the pressure output by the polishing head chamber, and the compound control device used for outputting the input pressure of the polishing head chamber based on the target pressure, the pressure output by the polishing head chamber and the control model. Each compound control unit comprises a neural network controller used for calculating neural network controlled quantity, a proportional integral controller used for generating proportional integral controlled quantity and a weighting device used for generating the input pressure of the polishing head chamber for the neural network controlled quantity and the proportional integral controlled quantity with the subsection variable-parameter control strategy. The adaptive inverse control system for the chemical-mechanical polishing machine is capable of reducing coupling among areas of the polishing head chamber through dynamic on-line decoupling of neurons.

The invention discloses an antenna array with a novel decoupling structure. A metasurface coating layer is arranged above the antenna array, the metasurface coating layer is supported by a dielectricsupport column and covers the antenna array, the metasurface coating layer comprises a dielectric substrate and a unit structure arranged on the dielectric substrate, the unit structure is used for adjusting a dielectric constant, and an equivalent dielectric constant of the metasurface coating layer is 15-45. The dielectric constant of the metasurface coating layer is adjusted by adjusting a sizeand a spacing of the unit structure of the metasurface coating layer, and coupling between antenna units is eliminated by adjusting the size and the spacing of the unit structure of the metasurface coating layer and heights of the metasurface coating layer and the array antenna. Coupling among the units of the antenna array can be effectively reduced to 20 decibels or below 25 decibels, and radiation efficiency of the antenna units is improved by above 10%.

The invention provides a ship target ISAR imaging method based on fractional Fourier transform. The ship target ISAR imaging method comprises the steps of: acquiring a radar echo signal of a scattering point of a ship target in each distance unit; modeling the acquired radar echo signals in the distance units into multi-component secondary frequency modulation signals through pulse compression andmotion compensation; determining estimated parameters of scattering point echo signals in the distance units according to the secondary frequency modulation signals; updating radar echo signals in the distance units by adopting the estimated parameters of the scattering point echo signals in the distance units; and acquiring an ISAR image of a ship target by utilizing the updated radar echo signals. The ship target ISAR imaging method adopts a symmetrical correlation function, fractional Fourier transform and multi-product processing for the radar echo signals in sequence, avoids the couplingof time and time delay, estimates a quadratic term phase coefficient and a cubic term phase coefficient with high precision, adopts a range-instantaneous-Doppler imaging technology combining with parameter estimation, and obtains a high-quality and high-precision ISAR image of a moving target.

The invention provides an intelligent antenna calibration method, as well as the device and the system thereof, and estimates the frequency response of the corresponding sub carrier wave position of each transmitting antenna and the channel impact response length of each transmitting antenna according to the received pilot symbols; the maximum value of the channel impact response length and the frequency response of each transmitting antenna are used for the interpolation on the positions of the sub carrier wave without the estimation of frequency response; according to the interpolated frequency response, the compensation coefficient of each transmitting antenna is worked out, and each transmitting antenna gets compensated correspondingly according to the compensation coefficient so as to lead the frequency response of each transmitting channel to be identical. Through the above proposal, the invention can improve the accuracy of estimation, reduces arithmetic operation, reduces disturbance and realize more simply and flexibly.

A torque compensation control method of a DGMSCMG system for spacecraft maneuver, which includes the following steps: building the kinetic models of a magnetic suspension rotor, an inner gimbal and an outer gimbal of the DGMSCMG system for the spacecraft maneuver, and designing a torque compensation control method to eliminate coupled disturbing torque in each single kinetic model, guarantee the compensation of the coupled disturbing torque of the DGMSCMG system for the spacecraft maneuver and realize the stability control of the DGMSCMG system, so that the stability and precision of spacecraft attitude control can be increased. The torque compensation control method can effectively eliminate the coupled disturbing torque of the DGMSCMG system for the spacecraft maneuver, guarantee the stability control of the DGMSCMG system and thereby realize the stability and precision of spacecraft attitude control.

An embodiment of the invention discloses a suspension control method which includes the steps: receiving a first gap signal and a first acceleration signal of a first suspension control point and receiving a second gap signal and a second acceleration signal of a second suspension control point; acquiring a first control signal and a second control signal according to the received signals; and simultaneously transmitting the first control signal to the first suspension control point and transmitting the second control signal to the second suspension control point, wherein the first control signal is used for controlling the suspension force of the first suspension control point, and the second control signal is used for controlling the suspension force of the second suspension control point. Therefore, acquired data of the two suspension control points of an electromagnet module on the same side of a train are transmitted to the same signal processor, two sets of control signals are acquired by comprehensively calculating the data of the two suspension control points, and the corresponding suspension control points are synchronously controlled, so that coupling of the two suspension control points of the electromagnet module on the same side of the train is eliminated when the suspension force is controlled.

The invention discloses an internal-model-based sliding mode control method capable of inhibiting mismatching disturbance of a permanent magnet linear motor. The internal-model-based sliding mode control method includes the steps that a five-phase fault-tolerant permanent magnet cylindrical linear motor model with mismatching disturbance is set up; an internal model controller of an ideal system is designed by adopting an internal model control strategy; based on the motor second-order mathematic model, mismatching disturbance observers are designed to observe mismatching disturbance of a motor system; two kinds of mismatching-disturbance-based observers are designed, the sliding mode control rules (the symbol is shown in the description) of the system under the two methods are solved; the expression (the symbol is shown in the description) is equivalently transformed to contain system mismatching disturbance errors, the Lyapunov function is selected, and the obtained sliding mode control rules (the symbol is shown in the description), a d-axis voltage set value (the symbol is shown in the description), an x-axis voltage set value (the symbol is shown in the description) and a y-axis voltage set value (the symbol is shown in the description) are used for achieving high-performance operation of the internal-model-based sliding mode control system capable of inhibiting mismatching disturbance of the fault-tolerant permanent magnet cylindrical linear motor by means of a voltage source inverter through a CPWM modulation method, wherein the d-axis voltage set value, the x-axis voltage set value and the y-axis voltage set value are output by a PI current regulator.