14results about How to "Wide operating frequency range" patented technology

The embodiment of the invention provides a directional coupler circuit, a circuit board and radio frequency measurement equipment, relates to the technical field of electronic circuits, and solves the problem that the radio frequency measurement equipment is difficult to adapt to low-frequency and high-frequency signals in the prior art. According to the directional coupler circuit, the working frequency range of the directional coupler circuit is expanded, a high and low frequency separation mode is adopted, high and low frequencies are separately amplified and converged at a third port, and each port is a port to the ground, so that signal extraction can be facilitated, and the directional coupler circuit can have better passband flatness and high-frequency characteristics.

The invention provides a front-end amplification circuit, a circuit board and data acquisition equipment, relates to the technical field of electronic circuits, and solves the problem that the working frequency of the data acquisition equipment is limited and an accurate signal measurement function is difficult to provide in the prior art. Therefore, different components in the to-be-measured signal are amplified, the working frequency range of the circuit is expanded, signal voltage can be amplified, a better signal-to-noise ratio and a better voltage standing wave ratio are achieved, the measurement accuracy of the signal is improved, and a more accurate signal measurement function is provided.

The invention relates to a nickel-zinc ferrite material and a preparation method and application thereof.The nickel-zinc ferrite material is prepared from main components and additives, the main components comprise Fe2O3, NiO, ZnO and CuO, and the additives comprise Bi2O3, Co2O3 and ZrO2; based on 100 mol% of the total substance amount of the main components, the content of Fe2O3 is 65 mol% to 66.7 mol%, the content of NiO is 10.6 mol% to 13 mol%, the content of ZnO is 17 mol% to 20 mol%, and the content of CuO is 2 mol% to 4.5 mol%. The nickel-zinc ferrite has the advantages of high wide-temperature magnetic conductivity, high broadband magnetic conductivity and the like by regulating and controlling the ratio of the main components of the raw materials, and can be better applied to the fields of transformers and wireless charging, so that the wireless charging efficiency is higher.

The invention relates to a multi-band filtering array antenna. Comprising a localized surface plasma and surface wave transmission gate of a single-layer structure, and an antenna patch assembly, the localized surface plasma is a polygon, and a first medium unit is arranged along the side length of the polygon; the number of the surface wave transmission grids corresponds to the number of the first medium units, second medium units are arranged along the single sides of the long edges of the surface wave transmission grids, and the positions of the second medium units are respectively opposite to the positions of the first medium units; the number of the antenna patch assemblies is one less than that of the surface wave transmission grids; the ports of the surface wave transmission gates are extended and then are connected with the antenna patch assemblies, and the ports of the surface wave transmission gates which are not connected with the antenna patch assemblies are used as output ends. The local surface plasma and the surface wave transmission gate are combined to serve as the multi-band filter, then the multi-band filter is connected with the antenna patch assembly to form the multi-band filtering array antenna, and needed multi-band signals can be obtained at the output end.

The invention discloses a tunable topological circuit resonator based on dark solitons in nonlinear SSH crystal lattices. The resonator comprises a first port, a second port and N circuit unit cells which are sequentially connected in series, N is a positive integer larger than 1, and each circuit unit cell is provided with two coupling nodes; two coupling nodes of the (N-1) non-isolated circuit unit cells are connected with the first port, and two coupling nodes of one isolated circuit unit cell are not connected with the first port; two coupling nodes of each circuit unit cell are connected with the second port through the nonlinear resonance unit; the two coupling nodes of the same circuit unit cell and the two adjacent coupling nodes of the adjacent circuit unit cells are connected through coupling capacitors or coupling inductors. According to the tunable topology circuit resonator based on the dark solitons, the working frequency range is widened, and a new solution is provided for a high-performance and reconfigurable microwave and radio frequency circuit system.

According to the temperature variable attenuator and the electronic equipment, the temperature variable attenuator is mainly composed of two resistors, compared with a device composed of three or more resistors, the working frequency range is wider, the size is smaller, and miniaturization of products is better facilitated; in addition, the first resistor can be accurately measured and debugged through the two signal electrodes, and the second resistor can be accurately measured and debugged through the signal electrodes and the ground electrode, so that the precision of the temperature variable attenuator can be improved.

A mixer circuit disclosed by the present invention comprises a diode mixer and a triode mixer, a first intermediate frequency signal pair output by the diode mixer is input to the triode mixer, and the triode mixer comprises a first triode mixer and a second triode mixer which are electrically connected. The triode mixer comprises a radio frequency input stage for amplifying an input signal, wherein a first intermediate frequency signal pair output by a first intermediate frequency port is input to the radio frequency input stage; the local oscillation frequency conversion stage is used for processing the first intermediate frequency signal pair input into the triode mixer into a second intermediate frequency signal pair by using a second local oscillation signal pair; the output load stage is used for converting the second intermediate frequency signal pair into a voltage signal and outputting the voltage signal, the linearity and noise performance of the whole mixer circuit can be improved, the mixer circuit is suitable for processing application scenes with high requirements for signal quality, the working frequency range of the whole mixing system is expanded, and the service life of the mixer circuit is prolonged. And the signal intensity and the dynamic range of the whole frequency mixing system are improved.

The application discloses a brain-computer interaction device with steady-state visual stimulation function and a brain-computer interaction method thereof, and comprises four parts of a control module (1), a partitioned backlight module (2), a liquid crystal module (3) and an electroencephalogram interaction module (4). Wherein, the output end of a partitioned backlight control circuit of the control module is connected with an LED driving circuit of the partitioned backlight module, the output end of a liquid crystal panel control circuit of the control module is connected with a liquid crystal driving circuit of the liquid crystal module, and the input end of the control module is connected with the output end of a signal processing module in the electroencephalogram interaction module. The application combines the steady-state visual stimulation brain-computer interaction and the partitioned backlight liquid crystal display technology, generates different frequency and phase coding space-time coding visual stimulation through the interaction interface based on the steady-state visual stimulation for different time and space, and improves the accuracy of the brain-computer interaction and the information transmission rate.

The invention relates to a piezoelectric-electret synergistically coupled low-frequency vibration energy taking device, which belongs to the technical field of vibration energy taking and comprises a coupling beam base, a cantilever beam fixed end, a piezoelectric cantilever beam, a movable end insulating mass block, an electret bracket, an electret film and a copper electrode plate, the cantilever beam fixing end is fixedly connected with the coupling beam base, one end of the piezoelectric cantilever beam is connected with the cantilever beam fixing end, and the other end of the piezoelectric cantilever beam is fixedly connected with the movable end insulation mass block and the copper electrode plate; the electret film is fixedly connected with the electret bracket; the copper electrode plate and the electret film are oppositely arranged in a non-contact manner; the piezoelectric cantilever beam comprises a metal pole plate in the center, an upper piezoelectric layer and a lower piezoelectric layer; and the piezoelectric component and the electret electrostatic component are respectively connected with an energy management circuit.

The invention discloses a power divider and electronic equipment, relates to the technical field of power dividers, and aims to solve the problem that a power divider in the prior art cannot give consideration to a wide working frequency range and high power. The power divider comprises a circuit board, and an input coaxial line, a transformer, a plurality of output microstrip lines and a grounding end which are arranged on the circuit board, and the transformer is used for realizing impedance conversion, the transformer is connected to the joint of the input coaxial line and the plurality of output microstrip lines, and the transformer is electrically connected with the grounding end to form a power dividing circuit of the power divider.

The invention discloses a unit frequency control method and device, a storage medium and heating and ventilation unit equipment. In a multi-unit parallel system, a host serves as a unique instruction center to uniformly schedule all units to start, it is ensured that the units synchronously enter a controlled state, and a foundation is laid for a follow-up unified frequency strategy. After the system is started, the host calculates and issues the optimal frequency range, so that the slave operates in the efficient interval, and the overall energy efficiency and the individual fine tuning space are both considered. During operation, the host continuously monitors multi-dimensional parameters of the system during operation, the adaptability of the current frequency range to actual requirements is evaluated, and accurate state diagnosis and data support are achieved. And when the original range cannot meet the requirement, the host dynamically calculates and synchronizes the updated frequency range to all the slaves. According to the mechanism, the overall energy efficiency of the system is maintained to be optimal, the units are ensured to be coordinated when the load is increased, the output capacity is smoothly improved, and the overall stability and reliability of the system are improved.

The application provides a non-synchronous measurement method of a cyclostationary sound source, a storage medium and computer equipment. The non-synchronous measurement method of the cyclostationary sound source comprises the following steps: using a microphone array with M channels to measure a to-be-measured sound source at different positions for P times; respectively calculating cross cyclic spectrum matrices of sound signals obtained by the microphone array at different positions; stacking the cross cyclic spectrum matrices according to diagonal lines to obtain a data-missing cross cyclic spectrum matrix with a dimension of MPxMP; constructing a constraint problem based on a completion target of the data-missing cross cyclic spectrum matrix, completing matrix completion of the data-missing cross cyclic spectrum matrix, and forming a completed cross cyclic spectrum matrix. The technical scheme of the application can be widely applied to the technical field of cyclostationary sound source measurement.

A microwave isolator of the present invention can solve the technical problems of conventional ferrite microwave isolators, such as complex structure, large size, low reliability, narrow operating frequency range, and failure to meet the needs. It includes a front-stage attenuation network, a non-reciprocal semiconductor device, and a rear-stage attenuation network; the front-stage attenuation network is connected to the front-stage link as the input stage of the isolator; the rear-stage attenuation network is connected to the rear-stage link as the output stage of the isolator; the radio frequency link formed from the input stage to the output stage is a transmission channel; an electromagnetic shielding structure is set between the input / output ends of the non-reciprocal semiconductor device and on both sides of the radio frequency link formed from the input stage to the output stage of the isolator. The present invention adopts semiconductor devices, and the product has a wide operating frequency range, a wide relative bandwidth, and a wider range of application; the operating frequency range of the present invention is almost unlimited, and can cover DC-terahertz. As long as such semiconductor chips support a high operating frequency, it can be applicable to a high frequency range.

The invention discloses a high-performance short-wave electric small antenna receiver device which comprises a cylindrical alkali metal atom air chamber, parallel plate waveguide electrodes, an optical fiber, a lens, a sleeve, a detection laser, a coupling laser and a radio frequency signal source. The two electrode plates are attached to the opposite sides of the cylindrical alkali metal atom gas chamber; the lens and the sleeve penetrate through the two ends of the cylindrical alkali metal atom gas chamber; the optical fiber is arranged in the lens and the sleeve; the detection laser and the coupling laser are respectively connected with an optical fiber and are arranged in the directions of two ends of the cylindrical alkali metal atom gas chamber; the radio frequency signal source generates a required local oscillation short wave field. The invention breaks through the theoretical limit of the current short-wave electric small antenna receiving. The method is suitable for an environment near room temperature, is simple and easy to operate, and is beneficial to practicability. The method has the advantages of high sensitivity, large working bandwidth, large instantaneous bandwidth, arbitrary frequency identification and the like.