51results about How to "Improve tuning performance" patented technology

The invention provides a linear frequency-modulated signal microwave photon frequency multiplication method and device. Under a large signal modulation mode, two parallel Mach-Zehnder modulators which are connected in parallel are utilized to generate high-order nonlinear optical sidebands; direct current bias phase positions and modulation coefficients of the two modulators are adjusted, so that in the optical sidebands output by the two modulators, required optical sidebands are the same in phase and stray optical sidebands are opposite in phase; polarization of the optical sidebands output by the two modulators are orthogonally coupled, and a polarization detection angle of an analyzer is adjusted, so that the stray optical sidebands is equal are power and completely counteracted, thereby obtaining the required optical sidebands; and linear frequency-modulated signals of eightfold frequency and twelvefold frequency are generated through frequency beating by detector, in the scheme, suppression of stray sidebands does not need optical filtering processing or any electrical phase shift processing, tuning performance of a system is good, and the linear frequency-modulated signal microwave photon frequency multiplication method and device are suitable for frequency multiplication processing of arbitrary waveform signals such as single-frequency microwave millimeter wave signals, linear frequency-modulated signals and nonlinear chirp signals, and have very broad application prospects.

The invention discloses a magnetic field modulation hybrid excitation motor and a multi-working-wave design method thereof. The motor comprises a stator and a rotor, wherein the stator comprises a stator iron core, two sets of windings and permanent magnets, the two sets of windings comprise an armature winding and an exciting winding, the stator iron core is designed as an open slot, one set of windings is distributed in the open slot of the stator iron core, and is wound on one stator tooth in a centralized manner, the outer surface of each stator tooth is provided with a groove, the other set of windings is placed in the groove of the stator tooth, each stator tooth is split into two modulation teeth through the groove, one permanent magnet is placed on each modulation tooth, the otherwinding is wound on two adjacent modulation teeth formed by splitting different stator teeth in a centralized mode, and the magnetizing direction of the permanent magnets is consistent with or opposite to the direction of a magnetic field formed by the excitation winding on the modulation teeth. According to the invention, the permanent magnet magnetomotive force and the excitation magnetomotive force are connected in parallel on the magnetic circuit and are independent from each other, so that the risk of irreversible demagnetization caused by the introduction of an excitation current permanent magnet is avoided, and the effective exertion of the magnetic regulation capability is ensured.

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.

The invention discloses a double-stator hybrid excitation motor with a T-type core inner stator. A center rotor is coaxially arranged in the middle of an outer stator and an inner stator. 12 T-type teeth are uniformly distributed along the circumferential direction of the inner stator yoke of the inner stator. The T-type teeth are sleeved with excitation windings. The top of each T-type tooth is near the center rotor. An inner stator slot is formed between every two adjacent T-type teeth. An arc permanent magnet is embedded fixedly between the tops of every two T-type teeth. The permanent magnets are magnetized along the tangential direction, and every two adjacent permanent magnets are magnetized in opposite directions. The inner and outer diameters of the permanent magnets are equal to the inner and outer diameters of the tops of the T-type teeth. The excitation windings are wound on the vertical parts of the T-type teeth of the inner stator, and thus, an electric excitation magnetic field connected in parallel with a permanent magnetic field is formed. The electric excitation magnetic field does not demagnetize the permanent magnets. When direct currents in different directions are fed to the excitation winding, the electric excitation magnetic field and the permanent magnetic field interact with each other to strengthen or weaken the magnetism.

The invention discloses an optical bandpass filter based on a double microring-Mach Zehnder interference structure. The optical bandpass filter is composed of a first multi-mode interference coupler, a second multi-mode interference coupler, a third multi-mode interference coupler, a first coupling grating, a second coupling grating, a first heating electrode, a second heating electrode, a third heating electrode, a fourth heating electrode, a first upload-download type micro ring, and a second upload-download type micro ring. According to the invention, on the basis of the design of the coupling states of two upload-download type micro rings, fully destructive interference is introduced based on a cascaded adjustable Mach Zehnder interference (MZI) structure; amplitude regulation is realized by adjusting the bias voltage on the heating electrode of the MZI1, so that amplitudes of passband external light signals of an upper arm and a lower arm becomes identical; and phase regulation is realized by adjusting the bias voltage on the heating electrode of the MZI2, so that phases of passband external light signals of the upper arm and the lower arm are opposite. Therefore, the extinction ratio of the filter increases under the circumstance that the passband insertion loss is not increased. The provided optical bandpass filter has advantages of narrow bandwidth, high extinction ratio, and low insertion loss.

This invention discloses a kind of long-periodic optical fiber grating band filtering method , it adopts two long-periodic optical fiber grating LPFG-I and LPFG-II which mate and connect together, making mandrel absorber in the core place in the back face of LPFG-I; The light is divided into core mode and cladding mode after passing LPFG-I , the core mode is absorbed by mandrel absorber, And the cladding mode pass through the interface of two gratings, be transferred to LPFG-II and coupling reversely to the core mode in its grating area, finally returning to the core mode of LPFG-II, outputting from the back face of LPFG-II. This method has removed the routine core mode in LPFG but has made use of the cladding mode, only the light which according with the phase match conditional can pass trough the grating pair of the long-periodic optical fiber, forming a band filter. This invention keeps merit of the exist LPFG filter that no back reflecting , tuning capability is good , making up its deficiency, changing the 'band stop'type spectrum to 'bandpass' type spectrum , realizing the real long-periodic optical fiber grating band filter.

The invention discloses a ferroelectric-semiconductor pn junction type novel laminated solar cell. The purpose of the invention is to solve the problem that the open-circuit voltage of the traditional (pn) junction type solar cell is limited by the band gap of the material and reaches the limit, while the short-circuit current (photovoltaic current) of the ferroelectric photovoltaic cell is small. The laminated solar cell comprises a metal electrode, a substrate pn junction, an inorganic ferroelectric material layer, and a second electrode. The novel laminated solar cell of the invention can overcome the defects of the existing traditional (pn) junction type solar cell and the ferroelectric photovoltaic cell. By adopting the strong points while overcoming the weak points of the traditional (pn) junction type solar cell and the ferroelectric photovoltaic cell and organically combining the two cells, a ferroelectric-semiconductor pn junction novel laminated solar cell is provided. The photovoltaic voltage (open-circuit voltage) of the solar cell is improved, and the photovoltaic current (short-circuit current) of the solar cell is improved. The efficiency of the solar cell is improved greatly. The solar cell is of great progressive significance.

The invention relates to the field of electromagnetic field microwaves, in particular to an X-waveband and S-waveband active reconfigurable frequency selective surface. The antenna comprises three layers of metal surfaces, wherein a layer of dielectric substrate is arranged between every two layers of metal surfaces; a plurality of periodic metal units are carved on the first metal surface; the diode on the third metal surface corresponds to the position of each periodic metal unit; the third metal surface layer is a bias circuit layer; metalized through holes are formed in the first dielectric substrate and the second dielectric substrate and are used for connecting and conducting diodes; and the second metal surface serves as a floor and an isolation layer and is used for isolating the influence between the metal surfaces and isolating and matching the metallized through holes. According to the invention, the working condition of each unit is independently regulated and controlled through the additional bias circuit, so each unit absorbs electromagnetic waves of an X waveband when the diode is conducted and absorbs electromagnetic waves of an S waveband when the diode is cut off.Meanwhile, due to the introduction of the biasing circuit, the frequency selective surface has better tuning performance and wider practicability.

The invention discloses a dual-mode dielectric waveguide filter, and the filter comprises a dielectric body with a conductive coating on the surface, wherein the dielectric body is divided into a plurality of resonant cavities, the top of at least one resonant cavity is provided with a dual-mode structure, and the dual-mode structure comprises two tuning blind holes and a coupling through groove.The two tuning blind holes must be punched from the same side of the dielectric body, the coupling through groove is located on the perpendicular bisector of the connecting line of the circle centersof the two tuning blind holes, the two blind holes generate a pair of TM210 odd and even modes, the resonant frequency of the two blind holes is controlled by the depths of the tuning blind holes, andthe capacitance loading effect of the resonant cavity is enhanced through the two blind holes; the resonant frequency of the TM210 odd mode and the TM210 even mode is reduced, the TM210 odd mode andthe TM210 even mode become a main mode of a resonant cavity, the coupling through groove generates an inductance effect, magnetic coupling is introduced between the TM210 odd mode and the TM210 even mode, and electromagnetic coupling resonance is formed together with the two tuning blind holes. According to the invention, two modes are used in one cavity, so miniaturization of the resonant cavityand even the filter is realized.

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 an organic-inorganic hybrid halide luminescent material as well as a preparation method and application thereof, the luminescent material is an organic-inorganic hybrid copper-based halide based on quaternary ammonium salt, the structural formula is AmCun X(m+n), A is an organic chain part of the quaternary ammonium salt, X is any combination of one or more anions of halogen ions Cl<->, Cl<->, Br<-> and I<->, and m and n are each an integer of 1-3. The organic-inorganic hybrid halide prepared based on the quaternary ammonium salt and the copper base has the characteristics of high PLQY, tunable spectrum, good stability in atmosphere, environmental friendliness and the like.

A signal transmitting method for an electric annulet antenna system in a micro wireless sensor is provided. The method comprises the step of using the electric annulet antenna system in the micro wireless sensor to transmit and receive communication signals. The method is characterized in that the electric annulet antenna system comprises a substrate, a feeding end and a ground terminal, wherein the substrate is an FR4 dielectric substrate; the feeding end is loaded with a lumped inductor; a capacitor and the inductor are in the 0603 encapsulating mode; the FR4 dielectric substrate, by means of a lumped loading technique, is optimized for size; the relatively small volume of the antenna allows three-dimension encapsulating with an RF circuit. By the lump-loaded capacitor and inductor, impedance matching is adjusted, and the antenna has a -10 dB bandwidth greater than 7 MHz and the radiation gain greater than 0.5 dBi. The echo loss is about 4MHz, and the radiation efficiency is greater than 20%. The directivity is relatively good.

A rotor is used in a permanent magnet motor and comprises a rotating shaft (111) and a rotor iron core (112) sleeved on the rotating shaft (111). The motor further comprises a plurality of first permanent magnet structures (14), the first permanent magnet structures (14) are distributed on the rotor core (112) in the circumferential direction of the rotor core (112), each first permanent magnet structure (14) comprises a first permanent magnet (141) and a second permanent magnet (142) which are arranged in the radial direction of the rotor core (112), and the coercive force of the first permanent magnet (141) is smaller than that of the second permanent magnet (142). Therefore, the air gap main magnetic flux can be regulated and controlled through the magnetization and demagnetization degrees of the first permanent magnets with low coercive force, and part of the main magnetic flux is short-circuited through the first permanent magnets with low coercive force during magnetic weakening, so that the short circuit of magnetic lines in the rotor is realized during magnetic weakening of a permanent magnetic field, the saturation of a magnetic circuit is reduced, and the magnetic adjusting range is effectively expanded.

The invention relates to an electrical small loop antenna system in a micro wireless sensor. The electrical small loop antenna system in the micro wireless sensor comprises a substrate, a feed terminal and a ground terminal, wherein the substrate is an FR4 medium substrate; the feed terminal is loaded with lumped inductance; the ground terminal is loaded with lumped capacitance; the capacitance and the inductance adopt a 0603 encapsulation mode; the FR4 medium substrate has a relative dielectric constant Epsilon of 4.4, a loss tangent value tanDelta of 0.02, and the thickness of 0.5mm; the electrical small loop antenna works at a frequency band ranging from ISM433.05 to 434.79MHz. Through a lumped loading technology, the size is optimized, the antenna with smaller volume can be three-dimensionally encapsulated with a radio-frequency circuit. The impedance matching is adjusted through the lumped loading capacitance and inductance, so that -10dB bandwidth of the antenna is larger than 7MHz, and the radiation gain is larger than 0.5dBi. The return loss is about 4MHz, the radiation efficiency is larger than 20 percent, and the directionality is better. Compared with a traditional 433MHz antenna with an ISM frequency band, the electrical small loop antenna has the characteristics of smaller size, simple structure, easiness in tuning and the like.

The invention discloses a double-magnetic-circuit magnetism adjusting type axial permanent magnet motor. The motor comprises a first rotor, a first magnetism adjusting ring, a first stator, an inner rotor, a second stator, a second magnetism adjusting ring and a second rotor which are coaxially installed. The first rotor and the second rotor each comprise a rotor yoke and a Halbach permanent magnet array arranged on the inner side of the rotor yoke along the circumference. The double magnetic circuits are respectively a magnetic field loop formed among the outer rotor, the magnetism adjustingrings, the stators and the inner rotor and a magnetic field loop formed among the outer rotor, the magnetism adjusting rings and the stators, and the magnetism adjusting performance is enhanced. Magnetic adjusting teeth are additionally arranged, and the double magnetic circuits are adjusted through the magnetic adjusting teeth. Fixing supports of the magnetism adjusting teeth comprise an inner layer and an outer layer arranged along the circumference, and the structure is light and firmer. Because the fixing supports are additionally arranged, there is a larger heat dissipation area for the heat on the magnetism adjusting rings, and cooling is easier.

The embodiment of the invention provides a tuning switch processing method and device, a storage medium and electronic equipment. The method comprises the steps of acquiring a first output port, transmitting an antenna signal, of a turning switch according to a frequency of the transmitted antenna signal; acquiring a first frequency band corresponding to the first output port; dividing the first frequency segment into a first sub-frequency segment and a second sub-frequency segment, changing the frequency band corresponding to the first output port to the first sub-frequency segment, setting afrequency band corresponding to an idling second output port to be as the second sub-frequency band, arranging a first matching circuit connected with the first output port according to the first sub-frequency band, and arranging a second matching circuit matched with the second output port according to the second sub-frequency band; and selecting the first output port or the second output port to transmit the current antenna signal according to the frequency of the current antenna signal when the current antenna signal of the first frequency band is received or emitted. By dividing the firstfrequency band into the two sub-frequency bands, the antenna signals of the two sub-frequency bands are respectively tuned.

The invention discloses a high-temperature-resistant broadband wave-absorbing structure composite material which comprises a composite material dielectric layer and a periodic structure layer, the composite material dielectric layer is composed of a mixed fiber preform reinforced ceramic matrix composite material and comprises a wave-transparent layer and a loss layer from outside to inside, and the periodic structure layer is made of a metal composite material. The preparation method of the composite material comprises the following steps: preparation of a fiber preform, preparation of an interface, preparation of a matrix and preparation of the periodic structure layer. The obtained composite material effectively achieves broadband absorption of electromagnetic waves, the integrity is obviously improved, the structural strength is obviously improved, and meanwhile, the physical properties such as material characteristics and heat resistance are excellent. Due to the high-impedance surface, the high-temperature-resistant broadband wave-absorbing structure composite material can selectively absorb electromagnetic waves with different frequencies through different periodic structures, and has excellent tuning capability.

The invention discloses a preparation method of a bismuth-based thin film with high tunability. The preparation method comprises the following steps: first, cleaning a substrate chip; then, preparing a zinc bismuth niobate inductive layer on the substrate chip; then, annealing at 650-750 DEG C; then, depositing to prepare a magnesium bismuth niobate thin film layer on the substrate chip with the zinc bismuth niobate inductive layer; and finally annealing at 750 DEG C to prepare the zinc bismuth niobate thin film in a bismuth-based structure with high tenability. Compared with the prior art, the preparation method disclosed by the invention is better in crystallinity, both the orientation and tuning performance are remarkably improved, and the tunability is increased from 30% to 35%.