52results about How to "Improve tuning performance" patented technology

The invention belongs to the radio-frequency technical field of accelerators, and in particular to automatic exercising system of a radio frequency resonant cavity of a circular accelerator. In the system, a comprehensive control module is adopted to comprehensively process, analyze and convert collected signals and make a logic response, an amplitude adjusting module is adopted to track and compare the amplitude of the signals to provide data for the comprehensive control module and make the logic response, a tuning module is adopted to track and compare the signal frequency to provide data for the comprehensive control module and make the logic response, and a state control module switches and selects various working states. In the system, a motor module is adopted to make corresponding actual responses to logic responses made by the comprehensive control module, the amplitude adjusting module and the tuning module. According to the invention, different cavity exercising methods are adopted for different exercising modes, so that exercise of the radio frequency resonant cavity can be conveniently completed.

The invention provides an antenna tuner and an antenna tuning system. The antenna tuner comprises a sampling circuit, an automatic tuning control circuit, an impedance transformer, a motor, a variable Inductor and an inductor. The sampling circuit is connected between an external transmitter and the impedance transformer in series, and is used for obtaining a phase comparison signal of the current and voltage values of the input signals, and outputting the phase comparison signal to the automatic tuning control circuit for measuring the phase difference; the automatic tuning control circuit is used for setting the impedance transformer and the inductor according to the working frequency, and setting the variable inductor through the motor according to the phase difference; the input signals are transmitted to the impedance transformer through the sampling circuit, and are further transmitted to the variable inductor through the impedance transformer, and the signals are coupled to an external antenna after being processed by the variable inductor. For the antenna tuner and the antenna tuning system, the phase difference is taken as the reference for adjustment, so that the tuning efficiency can be higher.

The invention discloses an aiming and focusing mechanism. The aiming and focusing mechanism comprises a mirror tube body and a steering tube; an adjusting cavity is formed in the mirror tube body; two calibrating structures and two adjusting fixed holes are arranged on the mirror tube body; the steering tube is positioned in the adjusting cavity; the calibrating structures include fixed bases and adjusting screws; in the corresponding calibrating structures and the adjusting fixed holes, the lower ends of the fixed bases extends into the adjusting fixed holes and are fixedly connected with the hole walls of the adjusting fixed holes; the adjusting screws are in threaded matching with the fixed bases; the outer ends of the adjusting screws are positioned out of the fixed bases, and the inner ends of the adjusting screws extend into the adjusting cavity; the adjusting screws and the adjusting fixed holes are coaxial; and a positioning spring is arranged on the mirror tube body. The aiming and focusing mechanism has the beneficial effects of reasonable structure, stable positioning, excellent calibrating capacity, capability of realizing switching of different calibrating amplitudes, adaption to various demands, no need of observation during adjusting, capability of directly realizing judgment of the adjusting quantity, convenience for operation and high calibrating accuracy.

The invention discloses a preparation method for a BMNT film material with high tunability. The preparation method is as follows: firstly, preparing Bi1.5Mg0.5Nb0.5Ti1.5O7 (BMNT ceramic target for short) by adopting Bi2O3, MgO, Nb2O5 and TiO2 by virtue of a conventional solid-phase reaction method; preparing a BMNT film with thickness of 100-300nm by virtue of a magnetron sputtering method; annealing at 700 DEG C in an atmosphere furnace, and finally preparing a metal electrode on the BMNT film. By doping titanium ions into a bismuth-based material, the tunability of the bismuth-based film is optimized; under drive voltage of 1MV / cm, the tunability reaches 35% which is superior to tunability (25%) of the BMN film under the same condition, indicating that the dielectric tunability is obviously improved.

The invention relates to the field of electromagnetic field microwaves, and relates to an active reconfigurable frequency selective surface in X and S bands. It includes three layers of metal surfaces, and a layer of dielectric substrate is arranged between every two layers of metal surfaces; a plurality of periodic metal units are engraved on the first metal surface; Corresponding; the third metal surface is the bias circuit layer; the first dielectric substrate and the second dielectric substrate are provided with metallized through holes for connecting the conduction diode; the second metal surface is used as the floor and the isolation layer to isolate the metal effects between surfaces, and to isolate and match metallized vias. The invention independently regulates the working condition of each unit through an external bias circuit, so that each unit absorbs electromagnetic waves in the X-band when the diode is turned on, and absorbs the electromagnetic wave in the S-band when the diode is cut off. At the same time, the introduction of bias circuit makes the frequency selective surface have better tuning performance and wider practicability.

The invention discloses a resonant cavity tuning structure, which comprises at least one metal cavity, a metal column, a support body and a medium body, wherein the support body extends into the metal cavity from the outer side of the metal cavity; the medium body is arranged at the top end, which extends into the metal cavity, of the support body. The resonant cavity tuning structure disclosed by the invention has the advantages of simpleness in processing, flexible structure and convenience in use. The resonant cavity tuning structure is expected to be widely applied to various microwave devices, and is especially used for the military and civil fields, such as radars, missile guidance and communication.

The invention discloses a magnetic field modulation hybrid excitation motor and its multi-working wave design method. It is an open slot. A set of windings is distributed in the open slot of the stator core. It is wound on one stator tooth in a concentrated manner. A groove is opened on the outer surface of each stator tooth, and the other set of windings is placed in the groove of the stator tooth. Each The stator teeth are split into two modulating teeth through grooves, and a permanent magnet is placed on each modulating tooth, and the other set of windings is wound on two adjacent modulating teeth split by different stator teeth, and the The direction of magnetization is consistent with or opposite to the direction of the magnetic field formed by the field winding on the tooth. The permanent magnet magnetomotive force and the excitation magnetomotive force of the present invention are connected in parallel on the magnetic circuit and are independent of each other, so as to avoid the risk of irreversible demagnetization caused by the permanent magnet fed with the excitation current, and ensure the effective display of the magnetic adjustment ability.

The invention discloses a multi-working mode dual-stator magnetic field modulation motor, which comprises an inner stator, a rotor, an outer stator, a permanent magnet, a first set of windings, a second set of windings; a first layer of air gaps and a second layer of air gaps They are respectively arranged between the inner stator and the rotor, and between the outer stator and the rotor; several stator teeth are arranged on the circumference of the stator, and the ends of the stator teeth have one or more small slots to form modulating teeth. The tooth end is composed of permanent magnets and modulating poles; the rotor is composed of magnetic conductors and non-magnetic conductors arranged alternately; the inner stator slot is embedded with a centralized first set of windings, and the outer stator slot is embedded with a centralized second set of windings; The purpose of the two sets of windings is determined according to the specific working mode. The multi-working mode dual-stator magnetic field modulation motor of the present invention can be applied in the field of transportation to solve the problem that the working performance of the motor cannot meet the actual needs under multiple working conditions due to complex and changeable road conditions.

The invention discloses a three-dimensional high-temperature superconducting super-gain antenna based on a resonance ring, and belongs to the technical field of high-temperature superconducting super-gain antennas. The antenna of the present invention includes a radiation structure, a dielectric substrate and a metal floor; the dielectric substrate stands on the metal floor, and the shape of the metal floor is circular; the radiation structure is located on the vertical surface of the dielectric substrate and is an axisymmetric structure, including four arcs Monopole, single-slit circular resonant ring, two double-slit circular resonant rings, two rectangular-slit circular resonators, and double-slit circular resonant rings. The antenna of the present invention uses an arc-shaped monopole to couple and feed the resonant ring, the input impedance is adjustable, and has excellent tuning ability; the resonant ring structure is used to achieve high directivity, and each resonant ring is coupled to achieve miniaturization and improve The purpose of directivity, so that the antenna achieves super directivity, and then the super gain of the antenna is realized by using superconducting materials to make the antenna almost lossless.

The invention discloses a preparation method of a high tuning rate BMNT thin film material: firstly, Bi 2 o 3 ,MgO,Nb 2 o 5 and TiO 2 , using the traditional solid-state reaction method to prepare Bi 1.5 Mg 0.5 Nb 0.5 Ti 1.5 o 7 Abbreviated as BMNT ceramic target; then prepare a BMNT film with a thickness of 100-300nm by magnetron sputtering; then anneal in an atmosphere furnace at 700°C, and finally prepare a metal electrode on the BMNT film. The present invention optimizes the tunability of the bismuth-based film by doping titanium ions into the bismuth-based material. Under the driving voltage of 1MV / cm, its tuning rate reaches 35%, which is better than that of the BMN film under the same conditions (25 %), the dielectric tuning rate has been significantly improved.

The invention discloses a partitioned stator type hybrid excitation motor in the field of electricians and motors. The partitioned stator type hybrid excitation motor is characterized in that the external part of a rotating shaft is provided with an inner stator, a middle rotor and an outer stator which are coaxially arranged in sequence from the inside out, the outer stator is uniformly provided with 36 outer stator teeth along the circumferential direction, and the outer stator teeth are wound with armature windings; the inner stator is uniformly provided with 36 inner stator teeth along the circumferential direction, the inner stator teeth are wound with centralized excitation windings, the middle rotor is forming by uniformly placing 16 magnetic conduction blocks and 16 permanent magnets along the circumferential direction in an alternative manner, the magnetic conduction blocks and the permanent magnets are identical in inner diameter and outer diameter, side surfaces of the magnetic conduction blocks and the permanent magnets are closely fit together, magnetizing directions of adjacent two permanent magnets differ 90 degrees, and the N poles of 16 permanent magnets along the clockwise circumferential direction reversely rotate by 90 degrees anticlockwise in sequence, so that permanent magnet flux at the armature winding side when the permanent magnets carry out excitation independently is effectively increased, and influences imposed on the excitation winding side by a permanent magnetic field are reduced while improving the power density of the motor.