74results about How to "Wide frequency coverage" patented technology

The invention provides a broadband signal generator. The broadband signal generator is characterized by comprising a communication control module, an intermediate frequency processing module, an up and down frequency conversion module and a local oscillator module. The intermediate frequency processing module modulates various modes of modulating signals into central frequency and sends the signals to the first frequency conversion branch and the second frequency conversion branch, and then the signals are output at two frequency bands of 30-560 MHz and 560-1000 MHz after being frequency-converted twice by the local oscillator module. The broadband signal generator overcomes the problems of poor frequency accuracy, narrow frequency range, low reaction speed, less function and the like in the prior art and meanwhile improves the production efficiency and facilitates batch production.

A multi-band remote oriented loud acoustic system is composed of a signal input device, a low pass filter 1, an A / D converter 1, an omnidirectional microphone, a low pass filter 2, an A / D converter 2, a digital signal processor and acoustic emission channels. The acoustic emission channel is composed of a power amplifier, a match circuit and a transducer unit. A plurality of acoustic emission channels simultaneously exist in the system and are respectively corresponding to different frequency bands. According to the system, automatic acoustic sample selection can be realized according to objects in the outside world, and oriented loud acoustic signals can be emitted simultaneously through the acoustic emission channels of different frequency bands. Thus, the system can have effects on a plurality of objects simultaneously.

The invention discloses a dual-circular-polarization phased-array antenna array, belonging to the technical field of antennas. The phased-array antenna array comprises a plurality of phased-array antenna array elements. Each phased-array antenna array element comprises a radiation unit with a microstrip patch, a dual-circular-polarization feed network, a capacitive loading unit and an AMC reflection floor, wherein the radiation unit comprises an upper dipole and a lower dipole, the two dipoles are distributed in a crisscross manner, the radiation arms of the dipoles are ellipses with gradual change structures, capacitive loading units are arranged at the tail ends of the radiation arms of the dipoles, the radiation unit is arranged right above the AMC reflection floor, the dual-circular-polarization feed network is a four-feed-point network, provides 90-degree or 270-degree phase difference feed for two adjacent radiation arms, and can realize left-hand circular polarization and right-hand circular polarization, the dual-circular polarization feed network comprises a bridge combination unit, and the bridge combination unit adopts a GaAs technology. According to the invention, the ultra-wideband low-profile dual-circular-polarization phased-array antenna array is realized.

The invention discloses a power distribution and combination machine based on an ultra wide band coaxial impedance transformer. The power combination machine comprises a one-to-four coaxial impedance transformer, outputs of the one-to-four coaxial impedance transformer are a first output circuit and a second output circuit, the first output circuit and the second output circuit are each connected with a one-to-one coaxial impedance transformer, the one-to-four coaxial impedance transformer is connected with the one-to-one coaxial impedance transformers in series, and power distribution of four circuits is achieved; after the power distribution is carried out on the four circuits, each circuit is connected to a coaxial line coaxial balun with an alpha characteristic impedance, each coaxial balun is connected with a push-pull amplifier, and combination of four stages of push-pull output power is achieved; or after the power distribution is carried out on the four circuits, the circuits are connected to coaxial line coaxial baluns Z1 which are matched with output impedance of the one-to-one coaxial impedance transformers and have the same characteristic impedance; each coaxial balun Z1 is distributed into two circuits of constant amplitude inversion signals by the power distribution; each circuit of each coaxial balun Z1 is distributed into two circuits, and finally combined output is carried out through coaxial baluns Z2 which has the same structure with the coaxial baluns Z1.

The invention provides a preparation method and application of a composite wave absorbing material of graphene and zeolite. The preparation method comprises the following steps: a, taking sodium hydroxide, dissolving to form a NaOH solution, dividing the NaOH solution into two parts, adding sodium metaaluminate in one part of the NaOH solution, stirring until the solution is clear, adding the graphene, and dispersing ultrasonically to obtain a solution A; b, adding sodium metasilicate in the other part of NaOH solution, stirring until the solution is clear, adding the graphene, and dispersing ultrasonically to obtain a solution B; c, adding the solution B in the solution A, stirring evenly, sealing and ageing, placing in a freezer dryer and carrying out freeze-drying to obtain the composite wave absorbing material of the graphene and the zeolite, wherein the molar ratio of the sodium metasilicate, the sodium metaaluminate and the sodium hydroxide is 1.24:1:3.66, and the mass ratio of the total graphene added in the step a and the step b to the sodium hydroxide is 0.05-2.0:10. The reflection loss of the material prepared by the invention can reach -53 dB, the frequency coverage area is wide, the wave absorbing property is good, the density is low, the content of the graphene is small, the cost of raw materials is low, and industrial production is convenient to realize.

The invention relates to a device for attaining the correct parameter of receiver, which comprises a receiver, a background computer and a noise resource. Wherein, one end of said noise source is connected to the input port of analogue channel of receiver, while another end is connected to the control unit of receiver to control the noise source; the background computer is connected to the control unit to send the correct request information of noise source while said information comprises the excess noise ratio information of noise source and the correct range of receiver. The invention also provides relative method which comprises: the background sends the correct request information of noise source to the receiver; the receiver controls the noise source and measures the correct parameter of receiver according to said correct request information. The invention uses the general noise source, to reduce the cost, improve the test accuracy and enlarge the test range.

The invention relates to a neuron coding circuit, belonging to the technical field of integrated circuits. In the neuron coding circuit, the analog voltage signal output by the traditional neural network is filtered and processed by a signal acquisition module to output a stable control voltage signal; The control voltage signal and the current signal outputted from the sensitivity adjusting unitare input to a frequency encoder, and after quantized and encoded by the frequency encoder, an analog signal with sigmoid function relationship between the frequency and the control voltage signal isoutputted. The pulse width regulator receives the analog signal and the pulse width control signal output from the frequency encoder, and outputs the pulse signal whose frequency is the same as the analog signal and whose pulse width is positively related to the pulse width control signal. The pulse emitting module receives the pulse signal from the pulse width regulator and transmits the pulse signal to the pulse neural network when the signal Ready emitted from the membrane potential detecting module is enabled. The neuron coding circuit of the invention has the advantages of simple circuitstructure, wide frequency coverage range, low power consumption and the like.

The invention discloses a broadband base station oscillator antenna and a base station antenna, the broadband base station oscillator antenna comprises a bottom plate, a substrate and two pairs of support plate groups arranged at an included angle, each support plate group comprises two vertical support plates arranged at an interval, the substrate is located above the bottom plate, and the vertical support plates are connected with the bottom plate and the substrate; two pairs of antenna units forming an included angle of 90 degrees are arranged on the top surface of the substrate, each pairof antenna units comprises two antenna subunits, each antenna subunit comprises an outer ring and an inner ring, and the inner ring is positioned in the outer ring and is connected with the outer ring; each support plate group is provided with an inverted-hook-shaped microstrip line feed balun, and the microstrip line feed balun is coupled with the corresponding antenna unit for feeding. The broadband base station oscillator antenna and the base station antenna are wide in coverage frequency band and excellent in performance, have the advantages of planarization, multimode resonance, stable gain and the like, and are simple in structure, convenient to manufacture and low in production cost.

The invention discloses a 5G millimeter wave antenna module and a mobile terminal. The antenna module comprises a support, wherein the support is provided with at least two antenna units, the antennaunit comprises a radiation main body, the radiation main body is provided with a main slot, the periphery of the main slot is provided with at least two branch slots, each branch slot comprises a first branch and a second branch, one end of the first branch is communicated with the middle part of the second branch, and the other end of the first branch is communicated with the main slot. The antenna unit can work in the frequency band ranges of n257 (26.5GHz to 29.5GHz), n258 (24.25GHz to 27.25GHz) and n261 (27.5GHz to 28.35GHz) by arranging the main slot and the branch slots on the radiationmain body, so that the coverage frequency band is wide; the antenna unit is simple in structure and low in test difficulty and beam management complexity; and the antenna unit occupies a small space and is suitable for mobile terminals such as mobile phones.

The invention discloses a 5G millimeter wave ultra-wideband dipole antenna unit and a packaged antenna module. The 5G millimeter wave ultra-wideband dipole antenna unit comprises a first dielectric layer, a balun which is arranged on the top surface of the first dielectric layer, and a first metal layer which is arranged on the bottom surface of the first dielectric layer; the first metal layer comprises a ground layer, a gap and a dipole, the gap is arranged on the ground layer and is coupled with the balun, the dipole is connected with a first side edge of the ground layer and is coupled with the gap, and the first dielectric layer is provided with a first plated-through hole used for feeding the balun. The n257 (26.5 GHz to 29.5 GHz), the n260 (37 GHz to 40 GHz) and the n261 (27.5 GHz to 28.35 GHz) can be effectively covered, and the coverage frequency band is wide; the antenna is small in overall size, can be based on a PCB, is more convenient for subsequent integration with a chip, and is especially suitable for hand-held equipment of a 5G millimeter wave communication system; and the design difficulty, the test difficulty and the beam management complexity are effectively simplified.

The invention belongs to the field of electromagnetic wave absorption, and discloses a heteroatom-doped woody plant-based electromagnetic wave absorption material and a preparation method thereof. Heterogeneous elements are doped into a natural pore channel structure of a woody plant-based material in situ by utilizing technical means such as high-temperature cracking and the like, and meanwhile,the high-performance electromagnetic wave absorption material with a three-dimensional straight-through hole structure is constructed by utilizing the natural structure; the woody plants are any one of bamboos, hardwoods and softwood; the heteroatoms are one or more of B, N, O, S, P and the like. The heteroatom-doped woody plant-based electromagnetic wave absorption material has the advantages oflow price, good electromagnetic wave absorption performance, wide coverage frequency, wide raw material sources, environmental friendliness, simple manufacturing process, controllable process and thelike.

The invention provides a nonlinear transmission wire breeze vibration protection device; the nonlinear transmission wire breeze vibration protection device is hung on a power transmission wire and ischaracterized in that the device comprises a sealing device and an electromagnetic damping device (2); the sealing device is of a hollow closed structure and is wrapped outside the electromagnetic damping device (2), so that the interference of the inner magnetic field and the outer magnetic field is prevented; the electromagnetic damping device (2) comprises a horizontal guide pipe (7) and a plurality of crossed guide pipes, and a certain included angle is formed among the crossed guide pipes, and the crossed guide pipes are fixed on the horizontal guide pipe (7) separately. According to thedevice, nonlinear electromagnetic damping can be generated in the vibration of the transmission wire, energy consumption is increased, meanwhile, the applicable vibration range is wider, and vibrationof the transmission wire can be better reduced.

The invention relates to a double-antenna network card which comprises a network card in the size of 82x81mm, a main antenna arranged on the shorter edge of the network card and an auxiliary antenna arranged on the longer edge of the network card, wherein the working frequency bands of the main antenna and the auxiliary antenna are respectively ranging from 746MHz to 960MHz and from 1710MHz to 2170MHz. Compared with the prior art, the two antennae are both high in efficiency and isolation, have wide covering frequency band and can be applied to multiple countries and regions.

The invention discloses a method for controlling a response peak value of the vibration by a memory alloy spring, which comprises the following steps: 1) the control over the response peak value of the vibration is determined according to the dynamic load capacity of vibration absorbing equipment; 2) according to the given vibration absorbing space, the weight of the vibration absorbing equipment and the requirement of the installation, the type of a memory alloy superelastic spring is determined; 3) the bearing capacity of the memory alloy superelastic spring is calculated by utilizing the memory alloy superelastic platform effect to obtain the parameters and the quantity of the memory alloy superelastic spring; and 4) the memory alloy superelastic spring is arranged to realize the control to the response peak value of the vibration. The method determines the control over the response peak value of the vibration according to materials, the shape and the given dynamic load capacity of the vibration absorbing equipment, then selects the type of the spring according to the vibration absorbing space, utilizes a memory alloy superelastic platform to control the response peak value of the vibration, can ensure that the response peak value is stabilized within the preset range, and effectively protect the safety of the equipment.