47results about How to "Achieving Phase Compensation" patented technology

The invention discloses a miniaturized electric bridge device suitable for 10MHz-8GHz, which is characterized in that it includes an excitation signal input port P1, the excitation signal input port P1 is connected to one end of winding b, and winding b and winding a form a twisted pair Wound on the magnetic ring, winding c is also wound on the magnetic ring, the end of winding a and winding c close to the excitation signal input port P1 is connected and grounded, and the other ends of winding b and winding c are connected to resistor R2 and resistor R3 Between, the other end of the resistor R2 is connected to the resistor R1, an isolation port P2 is set between the resistors R1 and R2, the other end of the resistor R1 is connected to the test port P3, and the other end of the winding a is connected between the resistor R1 and the test port P3 between; the invention solves the problem that the application frequency of the existing twisted-pair transmission line magnetic ring directional bridge is difficult to increase.

The invention discloses a sensor phase compensation device, method and magnetic levitation system. In the device, a first sensor and a second sensor are located at a group of diagonal positions of a rotating shaft in the magnetic levitation system; the first sensor can output a first acquisition signal; a second sensor capable of outputting a second acquisition signal; a phase adjustment unit configured to determine the phase difference between the first acquisition signal and the second acquisition signal, and perform phase adjustment on the phase difference to Phase compensation is performed for the lead or lag of the phase difference, so that the phases of the first acquisition signal and the second acquisition signal are consistent. In this scheme, in the magnetic suspension bearing control, by compensating the phase difference of the sine wave signals of the two sensors, the accuracy of the detected position signal of the rotating shaft can be improved, thereby improving the suspension stability of the shaft.

The invention discloses a metasurface-based plane cassegrain vortex field antenna, and mainly solves the problem that an existing vortex field antenna is high in phase compensation error, low in radiation gain and complex in structure. The metasurface-based plane cassegrain vortex field antenna comprises a main reflecting mirror (1), an auxiliary reflecting mirror (2), a feed source (3) and a supporting structure (4); the main and auxiliary reflecting mirrors and the feed source adopt a positive forward mode; the virtual focal point of the auxiliary reflecting mirror coincides with the focal point of the main reflecting mirror, and the solid focal point coincides with the phase center of the feed source; the auxiliary reflecting mirror adopts a phase change metasurface structure; the mainreflecting mirror adopts a plane structure; and the main reflecting mirror comprises a main dielectric layer (11), a main reflecting layer (12) and main phase regulating and controlling layers (13), wherein the main phase regulating and controlling layers are uniformly arranged, formed by a main metal ring microstructure (131) integrally distributed in a spiral shape and are used for generating vortex electromagnetic waves. By virtue of the metasurface-based plane cassegrain vortex field antenna, the vortex electromagnetic wave is efficiently excited, the antenna phase compensation error is reduced, the gain is increased, the structure is simplified, and the antenna can be used for communication and radar.

The invention discloses a broadband Doherty power amplifier, comprising a power divider, a main power amplification network, an auxiliary power amplification network and a broadband compensation network. The broadband compensation network is the compensation network which is composed of a capacitor, an inductor, a resistor and a microstrip and has a special structure. According to the broadband compensation network, a phase compensation effect can be achieved in a relatively wide band, a signal can be amplified efficiently in a relatively wide frequency range, the relatively high backoff efficiency is achieved in the band, and in particular, the ultrahigh efficiency is achieved at a 6dB power backoff position. Through adjustment of parameters of the compensation network, the broadband Doherty power amplifier can be generalized to the Doherty power amplifiers of other bands, and the broadband Doherty power amplifier has wide application prospect and practical value.

The invention belongs to the field of microwave energy application devices, and provides a continuous transmission focused microwave reactor, including a reaction device, a transmission device, a feeding device and a supporting device; it is characterized in that the feeding device includes a metal reflecting surface, a radiation horn, a Axial transmission line, waveguide coaxial conversion and microwave source, the metal reflection surface is set on the inner wall of the top surface of the metal cavity, the microwave source is connected to the radiation horn through the coaxial transmission line and the coaxial conversion of the waveguide, the radiation horn is fixed on the side wall of the metal cavity, and passes through the The radiation passes through the metal cavity and is inclined at a certain angle with the cavity wall, so that the focus of the metal reflection surface is located in the direction of the main lobe of the radiation horn. The invention adopts the mode of feeding the side end of the waveguide into the reflection focusing of the metal wall to realize the point of maximum field strength to irradiate the detection object, so as to improve the reaction efficiency, speed up the reaction speed, improve the uniformity of the reaction and save energy, and combine it with the continuous transmission production line , used in large-scale industrial production.

The present application relates to a phase difference measurement method and system and a phase compensation method for an antenna array, wherein the antenna array includes at least two array elements, and the method includes measuring and obtaining a three-dimensional space far-field phase data set of each array element in the antenna array ; Determine the three-dimensional solid angle space, and obtain the three-dimensional space far-field phase data corresponding to the three-dimensional solid angle space of each array element in the antenna array from the three-dimensional space far-field phase data set of the array element; the corresponding three-dimensional space of the first array element in the antenna array The three-dimensional space far-field phase data in the solid angle space is used as a reference to obtain the phase difference of other array elements relative to the first array element. The system includes a near-field anechoic chamber, a near-field measurement device, an antenna array, an acquisition unit and a calculation unit. The phase compensation method also includes performing phase compensation on each array element in the antenna array according to the obtained phase difference. The above method and system can realize phase difference measurement and compensation of different elements of the antenna array in three-dimensional space.

The invention discloses a high-linearity Doherty power amplifier implemented by a double-negative ferroelectric material. The high-linearity Doherty power amplifier comprises a main power amplifier module and an auxiliary power amplifier module which are connected in parallel, wherein an input end of the main power amplifier module corresponds to an input end of the Doherty power amplifier; an output end of the auxiliary power amplifier module corresponds to an output end of the Doherty power amplifier; a phase-shifting module is connected in series between an input end of the auxiliary power amplifier module and a main input end of the Doherty power amplifier; a double-negative ferroelectric structure for compensating for AM-PM distortion of the auxiliary power amplifier module under a high power condition is connected in series between an output end of the main power amplifier module and a main output end of the Doherty power amplifier; and an adjustable direct-current bias is introduced into the double-negative ferroelectric structure. Through adoption of the high-linearity Doherty power amplifier, an electromagnetic bandgap property and a slow-wave effect of the double-negative ferroelectric material structure are utilized, so that a required phase can be obtained by adjustment of the double-negative ferroelectric structure.

The present application provides a pulse modulation device, transmitter, system and method for CV-QKD, wherein the pulse modulation device includes a first pulse laser, a second pulse laser, a third pulse laser, an optical beam splitter, a first light ring shaper, a second optical circulator, an optical modulation module, and a polarization beam combiner, wherein the optical beam splitter is used to divide the pulsed light output by the first pulsed laser into a first optical pulse and a second optical pulse, wherein the first The light pulse is injected into the second pulse laser, and the second light pulse is injected into the third pulse laser, so that the second pulse laser and the third pulse laser emit pulses of the same frequency and phase, and the produced reference light and signal light not only have good spectral quality, Moreover, it is not necessary to obtain a pulse with a high extinction ratio by cascading AMs, thus reducing the difficulty of obtaining pulse modulation. In addition, at least two high-performance AMs in the chopping scheme are saved, which greatly reduces the cost of pulse modulation.

The invention discloses a metasurface-based convex conformal cassegrain antenna, and mainly aims to solve the problems that the existing antenna is high in phase error, complex in structure, and hardto realize convex cassegrain beam calibration. The metasurface-based convex conformal cassegrain antenna comprises a carrier (1), a main reflecting mirror (2), an auxiliary reflecting mirror (3), a feed source (4) and a supporting structure (5); the carrier adopts a convex structure; the main reflecting mirror is conformal with the carrier; each of the main reflecting mirror and the auxiliary reflecting mirror adopts a phase change metasurface structure established based on generalized Snell law, wherein the auxiliary reflecting mirror is located below the focal point of the main reflecting mirror and has a hyperbolic characteristic phase, and is used for dispersing the electromagnetic waves emitted by the feed source into spherical waves, wherein the virtual focal point of the auxiliary reflecting mirror coincides with the focal point of the main reflecting mirror, and the solid focal point coincides with the phase center of the feed source; and the supporting structure is connected with the main reflecting mirror and the auxiliary reflecting mirror. By virtue of the metasurface-based convex conformal cassegrain antenna, wave beam calibration of the convex cassegrain antenna can be realized; and meanwhile, the antenna phase compensation error is lowered, the structure is simple, and the antenna can be used for communication and radar.