151results about How to "Small phase difference" patented technology

The invention provides a feed source locating and focus offset device for compact range measurement. The device is used for precise location and focus offset motion of a feed horn in an electromagnetic measurement process of a compact range. The device mainly comprises left and right transverse movement along the X axis, front and back longitudinal movement along the Y axis, rotation and translation around the Z axis and pitching movement around the phase center of a feed source. Accurate locating and focus offset of the feed source are realized through movement of five freedom degrees, and focus offset measurement is completed. By means of servo control, polarization rotation and uniform rotation at a certain rotation speed of the feed horn can be realized, and RCS (radar cross-section) measurement or antenna measurement is completed. The device comprises an X-axial moving unit, a Y-axial compensation unit, a Z-axial rotating and height adjusting unit, an offset arm, a feed source pitching unit and a feed source polarization unit. Different from a fixed feed source locating device, the device can not only be used for precise location of the feed source during measurement of the compact range in a traditional manner, but also be used for measurement of new demand ways such as focus offset and the like; the device has the advantages of high measurement efficiency, high locating precision and simple and reliable control process.

The present invention provides systems and methods for implementing narrowly spaced correlators to mitigate multipath error, and systems and methods for adaptively changing the correlator spacing for varying multipath conditions. In an embodiment, two sets of correlators with the same code frequency but different code phases are used to implement an adjustable correlator spacing. The correlator spacing is determined by the code phase difference between the two sets of correlators, which can be adjusted, e.g., by adjusting the code phase values of Numerically Controlled Oscillators (NCOs). An advantage of embodiments of the present invention is that they can achieve much narrower correlator spacings than conventional techniques, e.g., by making the code phase difference between the two sets of correlators very small. Further, the correlator spacing can be adjusted for varying multipath conditions, whereas the correlator spacing in conventional techniques is fixed.

The invention discloses a high-accuracy complementary metal oxide semiconductor (CMOS) single-end-input to differential-output converter. As a figure (5) shows, the high-accuracy CMOS single-end-input to differential-output converter consists of a load resistor R1, a bias resistor RB1, metal oxide semiconductor (MOS) transistors M1 to M8, and a coupling resistor RF. The high-accuracy CMOS single-end-input to differential-output converter is characterized in that: a common mode output signal is compared with a reference common mode bias voltage; and if the common mode output signal is not equal to a reference value, a feedback loop can be generated for adjusting a bias current M3 of a differential amplifier to make the common mode output signal equal to the reference value, so that the common mode output signal can be effectively controlled.

The invention discloses a miniature LTCC 1.8-GHz power divider with a built-in resistor. The miniature LTCC 1.8-GHz power divider with the built-in resistor comprises a surface-mounted 50-ohm impedance input port, an input inductor, a first spiral inductor, a second spiral inductor, a ground capacitor, a shunt capacitor, two vertical ports, two first parallel ports, two second parallel ports, the built-in tantalum absorption resistor, a first output inductor, a second output inductor, a first surface-mounted 50-ohm impedance output port, a second surface-mounted 50-ohm impedance output port and a ground plate. The miniature LTCC 1.8-GHz power divider is made of LTCC materials in a three-dimensional integrated mode and has the advantages that use is easy and convenient, the size is small, the isolation degree is high, the insertion loss is low, the phase difference between the two output ports is small, the reliability is high, the electrical performance and the temperature stability are good, the cost is low, and mass production can be achieved.

The invention provides an iron cobalt nickel based anti-DC nanocrystalline alloy material and a preparation method thereof. Based on an existing traditional iron-based nanocrystalline soft magnetic alloy formula (Fe73.5Cu1Nb3Si13.5B9), a certain proportion of nickel and cobalt elements are added to overcome nonlinear characteristics caused by excessive initial permeability of amorphous nanocrystalline material, and the novel iron-based amorphous nanocrystalline material has stable magnetic properties and the initial permeability of 1800-6000, and the molecular formula of Fe96-x-y-zCoxNiyCu1Nb3Si0.55zB0.45z, wherein x+y is more than 9 and less than 30, and z is more than 18 and less than or equal to 20. The preparation method is based on a single-roll ultra-cold method, and comprises the steps of mother alloy ingot casting, re-melting, tape making, and strip winding. The iron cobalt nickel based anti-DC nanocrystalline alloy material can satisfy the requirements on various performance indexes including high saturation magnetic induction density, high linearity, low loss and low remanence of soft magnetic material of a current transformer.

The present invention discloses a dynamically tuning device and a tuning method for the sending terminal of a wireless electric energy transmission device, and relates to the technical field of wireless electric energy transmission. The primary side of the dynamically tuning device is provided with a phase detection device PD, a BUCK circuit, a control unit CU and a rectifier bridge. According to the detected phase difference state, the resonant state is judged. Meanwhile, the real-time tuning is realized through adjusting the equivalent output resistance of the BUCK circuit. As a result, the primary side can be maintained to run at a minimum voltage phase difference and a minimum current phase difference. That means, a primary side circuit is closer to the completely resonant state, so that the active power of the sending terminal is improved. Furthermore, the transmission power and the transmission efficiency of the wireless electric energy transmission device are improved.

The invention provides an optical film, a polarizer protective film, a polarizing plate and an image display device. The optical film in the invention comprises a (methyl) acrylic acid polymer (c) with an N- substitute maleimide unit (a) and a (methyl) acrylic acid ester unit (b) as the structural unit. The N- substitute maleimide unit (a) is a structural unit applying effect of positive fixing double refraction upon the (methyl) acrylic acid polymer (c). The (methyl) acrylic acid ester unit (b) is a structural unit applying effect of negative fixing double refraction upon the (methyl) acrylic acid polymer (c). The optical film in the invention displays an inplane phase difference Re in the range of 0nm to 10nm, and a thickness direction phase Rth in the range of -10nm to 10nm with respective to light with wavelength of 589nm. The optical film in the invention is a bidirectional stretching film. Although the optical film is a bidirectional stretching film, the displayed phase direction is small and high heat resistance is provided.

A power saving operation control method and device for a phase comparator unit are provided. The control device includes: a reference signal frequency dividing unit which divides the frequency of a reference signal to generate a reference frequency divided signal; a comparison signal frequency unit which divides an input signal to generate a comparison frequency divided signal; a phase comparator which compares the phases of the reference frequency divided signal and the comparison frequency divided signal; a canceling signal generator which generates a power saving state canceling signal in accordance with the reference frequency divided signal and the comparison frequency divided signal; a first initializing signal generator which generates a first initializing signal for initializing the reference signal frequency dividing unit in accordance with the power saving state canceling signal; and a second initializing signal generator which generates a second initializing signal for initializing the comparison signal frequency dividing unit in accordance with the power saving state canceling signal.

The invention discloses an optical fiber vibration sensing system based on a dual modulation Mach-Zehnder interferometer. The system comprises a Mach-Zehnder interferometer, a host computer and a slave computer arranged at both ends of the interferometer, two coupler, four optical circulators, two phase modulators and two sensing optical fibers. The optical fiber vibration sensing system based on the dual modulation Mach-Zehnder interferometer loads modulating signals sent by the host computer and the slave computer at both ends of the optical fiber interferometer to the phase modulator of the interferometer to realize dual modulation, after modulated signals are coherent, signal sampling and demodulation are realized at an opposite end of a light source, the modulating signals are delayed as demodulating signals in a process of realizing demodulation, so that time delay that the modulated signals reaches a demodulating module through transmission and circuit relay is counteracted, thereby solving the disadvantage that since phase difference between the modulating and demodulating signals is too large, a demodulating result is severely distorted, and further enabling the phase difference between the modulating signals and the demodulating signals of the host computer and the slave computer ends to be greatly reduced, thereby achieving relatively high positioning precision.

While it is necessary for a package for housing electronic components to be furnished with numerous wire conductors, phase differences of signals, caused by differences in the signal transmission distance among wire conductors, is a problem. This package for housing electronic components has: a substrate having a dielectric area and an electronic component mounting area; a frame furnished to enclose the dielectric area and the mounting area; and a plurality of wire conductors arranged in the dielectric area of the substrate. The plurality of wire conductors have first wire conductors arranged in the dielectric area from directly below the frame, and second wire conductors of longer signal transmission distance than the first wire conductors. The frame, which comprises a dielectric, is provided with a protruding part protruding from the inside peripheral surface, and covering the first wire conductors at least in part.

The invention discloses a visible light heat reflection temperature measuring device. The device comprises an illumination light path used for providing an illumination pulse signal for a to-be-measured sample, a sample excitation module used for applying excitation pulse signals to the to-be-measured sample, an imaging module used for capturing illumination pulse reflection signals reflected by the to-be-measured sample and acquiring a thermal process image of the to-be-measured sample under the excitation of the excitation pulse signals, wherein the imaging module captures the illumination pulse reflection signals corresponding to the same phases of the excitation pulse signals within the same exposure period; and the phases of the excitation pulse signals corresponding to the illumination pulse reflection signals captured by the imaging module in different exposure periods are different. The thermal process image of a semiconductor device can be realized through the visible light thermal reflection temperature measuring device; and the preset duration is shortened, and the preset phase difference between the illumination pulse signals and the excitation pulse signals is reduced, so that the time precision of the thermal imaging process is improved, and the time resolution is greatly improved.