77results about How to "Wide frequency" patented technology

Disclosed herein are a speaker for mobile terminals which has a slim structure and has a wide frequency characteristic and an excellent high frequency distortion characteristic, thus accomplishing an excellent sound quality, and a method of manufacturing the speaker.

Filter for microwaves and millimetER waves, characterised in that it comprises a planar transmission medium (1) that it includes a conductor strip (3), metallic ground plane (4) and dielectric substrate (2) and in that it includes at least one split rings resonator (5a, 5b, 5c, 5d, 5e and 5f)

A plasma processing apparatus includes a processing gas supplying unit for supplying a desired processing gas to a processing space between an upper electrode and a lower electrode which are disposed facing each other in an evacuable processing chamber. The plasma processing apparatus further includes a radio frequency (RF) power supply unit for applying an RF power to one of the lower and the upper electrode to generate plasma of the processing gas by RF discharge and an electrically conductive RF ground member which covers a periphery portion of the electrode to which the RF power is applied to receive RF power emitted outwardly in radial directions from the periphery portion of the electrode to which the RF power is applied and send the received RF power to a ground line.

The present invention consists of the particular geometry of the reflectors or dispersers which constitute the anti-radar chaff cloud. Instead of using conventional rectilinear forms, in the present invention multilevel and space-filling forms are introduced. Due to this geometric design, the properties of the radar chaff clouds improve mainly in two aspects: radar cross-section (RCS) and mean time of suspension.

A thin-film coil assembly includes a flexible substrate, an oscillation starting antenna, a resonant antenna, a first protective layer and a second protective layer. The flexible substrate has a first surface and a second surface opposed to the first surface. The oscillation starting antenna is disposed on the first surface of the flexible substrate. The resonant antenna is disposed on the second surface of the flexible substrate. Moreover, at least one capacitor is connected between a first end and a second end of the resonant antenna. An electromagnetic wave with a specified resonant frequency is emitted or received by the thin-film coil assembly in response to a resonant coupling effect of the resonant antenna and the oscillation starting antenna. The first protective layer covers the oscillation starting antenna. The second protective layer covers the resonant antenna.

The invention discloses a novel radio frequency reconfigurable band-pass filter with a wide frequency and a wide adjustment range of broadband. The reconfigurable filter comprises an upper-layer microstrip structure, a middle-layer medium substrate and the lower-layer grounded metal. The upper-layer microstrip structure is composed of an input port, an input feed network, a cross adjustable multimode resonator, an output feed network and an output port which are connected in succession. The input feed network and the output feed network are both composed of a blocking condenser and a 50-ohm microstrip line. The cross adjustable multimode resonator is composed of two microstrip lines which are perpendicular to each other and six varactors with two ends of the varactors connected. The input feed network and the output feed network tap feed electricity respectively from the two varactors with two ends of the varactors in series connection of the left side and the right side of the multimode resonator. The reconfigurable filter has the advantages of being wide in central frequency and adjustment range of bandwidth and good in passband stability, and being capable of being reconfigured the broadbands with different central frequencies or a narrow-band band-pass filter and can be used for the front end of the reconfigurable radio frequency.

Signals of interest in magnetic resonance imaging (MRI) systems comprise narrowband, circularly polarized (CP) radio-frequency magnetic fields from rotating atomic nuclei. Background “body noise” may comprise broadband, linearly polarized (LP) magnetic fields from thermally-activated eddy currents, and may exceed the signal in a band of interest, limiting the imaging resolution and requiring excessive averaging times. Noise may be selectively detected and substantially suppressed, while enhancing the signal of interest, using appropriate digital time-domain algorithms. At least two quadrature receiving antennas may be employed to distinguish and separate the LP noise from the CP signal. At least one broadband receiver may be used to identify and localize fast noise sources and to digitally filter the representation of their radio-frequency magnetic fields in the signal. Selective body noise reduction may allow enhanced signal-to-noise ratio of the system, leading to improved imaging resolution and shorter scan time.

A golf club head of an iron type includes a face plate part for hitting a ball, which has a cavity part on the back side thereof; a sole part; a hosel part for connecting the head to a shaft; a viscoelastic body made to adhere to the back face of the face plate part, the viscoelastic body including a board-shaped part located on the back face of a central portion of the face plate part and extending parts extending from the board-shaped part to the toe side and the heel side of the head; and a cover plate lapping over the viscoelastic body, the cover plate including a concavity for accommodating the board-shaped part of the viscoelastic body and concave lines for accommodating the extending parts of the viscoelastic body. The cover plate has an opening, and a part of the viscoelastic body is exposed through the opening.

The invention discloses a triangular wave signal generator. The triangular wave signal generator comprises a clock circuit unit, a programmable logic controller unit, a DDS unit, an amplifier unit and an adder unit which are connected in sequence, the programmable logic controller unit is further connected with a JTAG interface unit, and the adder unit is further connected with a direct current reference voltage unit. The triangular wave signal generator uses the advanced high-speed digital signal processing technology and direct digital frequency synthesizer technology to overcome the disadvantages of narrow frequency range, complex circuit, various apparatuses, high cost, low independence, and low practicability and so on of an existing triangular wave signal generator.

The invention discloses a tester for testing a multifunctional vane, which comprises a test bed, a tester for testing static strength and a tester for testing fatigue, wherein the bed body of the test bed is cast by reinforced concrete; the part of the test bed below ground takes the shape of a ladder; and the front end of the part of the test bed above ground is provided with a vane connecting disc fixed by a fixing part. The vane connecting disc and the bed body corresponding to the vane connecting disc are internally provided with a plurality of blind holes which are internally provided with bolt sleeves embedded with the vane connecting disc. The bolt sleeves are fixed by extension reinforcing rods fixed in the bed body. In addition, a test pit is positioned on the ground on which the front end of the bed body of the test bed is arranged; and the test pit is a slope with one end away from the bed body extending below ground. The invention has the advantages of solid structure, strong holding power and long service life. The tester has firm structure, strong supporting force and long service life, and is suitable for installation test of various vanes with different sizes, available for tests of different indexes for vanes. The tester is accurate in test, very convenient in use and wide in application range. In addition, the tester has the advantages of reducing disassembly and assembly of the vane for testing the performance index thereof, saving the testing time and cost, and reducing the damage to the vane.

Provided is a self-adaptation threshold value circuit of a comparator. The threshold voltage of the circuit is suitable for the input signal property. In one instance, a steady state threshold voltage stored in a peak detection capacitor is generated through the base-emitter voltage ratio of two emitter followers. When an input signal is changed, the threshold voltage is changed along with the change of the input signal. A current source controlled by the voltage detects the amplitude of the input signal, and the amplitude of the threshold voltage is adjusted by the way of controlling the voltage drop on a resistor. A feedback signal indicates that the state of the comparator output end which is coupled to the self-adaptation threshold value circuit is used for providing lags. In another instance, the threshold voltage is determined by the voltage drop on a first resistor, a current controlled by the voltage detects the amplitude of the input signal, and the amplitude of the threshold voltage is adjusted by the way of controlling the voltage drop on a second resistor.

The invention discloses a segmented low-voltage control gain ring oscillator. The segmented low-voltage control gain ring oscillator comprises a delay cascade circuit, a tuning slope switching circuit and an oscillation frequency segmented control circuit. The segmented low-voltage control gain ring oscillator is characterized in that the tuning slope switching circuit is used for switching tuning voltage, and the switched tuning voltage is output to the tuning voltage end of the delay cascade circuit so as to adjust delay time of cascade delay units. The oscillation frequency segmented control circuit receives external control signals, current signals of different magnitudes are output according to the external control signals, and the voltage across the tuning voltage end of the delay cascade circuit is adjusted. The delay cascade circuit is composed of the four levels of delay units, the tuning voltage ends of the four levels of delay units are connected together, and the tuning voltage output by the tuning slope switching circuit is received. The tuning slope switching circuit and the oscillation frequency segmented control circuit are combined, and the ring oscillator simultaneously achieves wide frequency covering and low-voltage control gain characteristics, and can be widely applied to a radio frequency phase-locked loop system.

The invention relates to a s smoke dust gas sampling device integral detection system comprising an IPC (industrial personal computer); the input end of the IPC is respectively connected with a flow detection module, a temperature measuring module, a pressure detection module, an atmosphere pressure measuring module, a smoke gas detection module and a flow rate detection module. The smoke dust gassampling device integral detection system can calibrate all parameters on one platform, thus ensuring measuring data accuracy, greatly improving the calibration efficiency, providing more accurate and fast smoke dust sampling device integrated measurement, and filling the blanks in the national smoke dust sampling device calibration field. The detection system can detect various performance parameters of pollutant sampling devices like the smoke dust gas sampling device in all aspects on all performances, can integrally measure the indexes like a tested gauge atmosphere pressure, the flow, the environment temperature, the temperature before measurement, and the smoke gas temperature, thus realizing more accurate and fast smoke dust sampling device integrated measurements.

This invention relates to high precision, fluid-containing, transducer-based accelerometers that are capable of measuring acceleration, inclination, position and velocity by measuring the electronic response of a transducer to fluid flow caused by external acceleration or by free convection. The accelerometers of this invention are capable of varying the local density of the fluid, thereby creating a volume of fluid with a lower or higher density compared to the rest of the fluid in the accelerometer. The movement of this volume of lower or higher density fluid as a result of external acceleration is measured to determine the external acceleration.

The invention provides a power distribution network singlephase earth fault positioning method and system based on frequency sweep injection; the system comprises a plurality of to-be-positioned lines; input ends of the plurality of to-be-positioned lines are respectively connected with output ends of a three-phase bus; the output ends of the plurality of to-be-positioned lines are respectively electrically connected in order with a three-phase voltage transformer and three high voltage switches; the system also comprises a controllable power supply respectively electrically connected with thethree high voltage switches, and a plurality of fault indicators respectively scattered on the plurality of to-be-positioned lines and respectively located behind the three high voltage switches; thecontrollable power supply can inject the current with a wide frequency and an adjustable amplitude into the three-phase bus; the injection process employs a frequency sweep method; the injection current can be set according to different power grid framework parameters; the current with the optimal injection characteristics is selected; aiming at the current with the optimal injection characteristics, the real time characteristic current value in each phase of the three-phase bus can be returned by the fault indicators, thus determining a fault area. Compared with the existing positioning mode, the power distribution network singlephase earth fault positioning method and system are higher in accuracy.

A variable resonator has a dielectric substrate 2, an input / output line 3 formed on the dielectric substrate 2, a first resonator 4 that has one end connected to the input / output line 3 and the other end grounded, and a second resonator that has one end connected to the input / output line 3 at the point of connection of the one end of the first resonator 4 and the other end grounded via a terminal switch 7. When the terminal switch 7 is turned off, resonance occurs at a frequency at which the sum of the line lengths of the first resonator 4 and the second resonator 6 equals to a quarter of the wavelength. When the terminal switch 7 is turned on, resonance occurs at a frequency at which a half of the sum of the line lengths equals to a quarter of the wavelength.

A film-type audio-speaker is provided that uses a piezoelectric film as a vibration element to provide a reinforcement of the low to medium frequency band sound waves generated. The film-type audio-speaker uses a piezoelectric film as a vibration element and comprises a piezoelectric film with an electrically conductive polymer or metal layer coated on its surface, a terminal portion electrically connected to the piezoelectric film; and an audio-speaker driving unit connected to the terminal portion. The film-type audio-speaker has a cover member that is made of a porous material attached to the front surface and / or the rear surface of the piezoelectric film.

The invention relates to a novel nonlinear earthquake reduction device. The novel nonlinear earthquake reduction device can effectively dissipate energy introduced by a body and introduce the energy into the earthquake reduction device in a one-way mode, broadband earthquake resisting is achieved, resonance damage is avoided, and the novel nonlinear earthquake reduction device has suitable rigidity and damping capacity, and is stable in performance, compact in structure, variable in frequency, controllable in damage and easy to manufacture. A vibration absorber is mainly a horizontal earthquake absorbing device, the whole structure is in a long-strip shape, and the novel nonlinear earthquake reduction device comprises end fixing members (1), connecting pre-embedded pieces (2), silica-gel damping mats (3), nonlinear rigid springs (4), steel tube sliding ways (5) and a NES vibrator (6). The novel nonlinear earthquake reduction device can be used for interlayer earthquake isolation and basic earthquake isolation of an engineering structure, and can also be used for earthquake isolation of a mechanical device.

The invention discloses a nano-modified water-based weather-resistant sound isolation adhesive. The nano-modified water-based weather-resistant sound isolation adhesive consists of an acrylate polymer emulsion, an organic silicone modified acrylate copolymer emulsion, a tackifier emulsion, a filler, water, a dispersing agent, a wetting agent, nano-powder aqueous dispersion, a sterilizing agent, a PH value regulating agent, a de-foaming agent and a thickening agent. A preparation method of the nano-modified water-based weather-resistant sound isolation adhesive comprises the steps of emulsion polymerization, emulsion blending, filler slurry preparation, mixture nano-modification and finished product synthesis. The nano-modified water-based weather-resistant sound isolation adhesive has the advantages of wide temperature range, wide frequency, high damping platform, high peeling strength, energy conservation, environment friendliness and light weight; the cost is saved, the construction difficulty is lowered, and the effective space utilization rate is greatly improved. Due to modification of a nano material, the nano-modified water-based weather-resistant sound isolation adhesive is wide in temperature range, good in moisture protection, resistant to heat, light, salt spray and the like, good in ageing resistance, wide in using environment range, high in sound isolation efficiency and high in using value. The sound isolation adhesive is aqueous, has environment-friendly and pollution-free effects, and belongs to novel energy-saving and environment-friendly high molecular materials.

There is disclosed a silencer for attenuating sound waves produced in a fluid that circulates through a fluid conveyer. The silencer comprises an expansion chamber that is in fluid communication with the fluid conveyer, and which carries sound waves there through; a sound wave dissipater provided with the expansion chamber and arranged to absorb sound waves traveling there through; a resonator operatively associated with the sound wave dissipater and constructed and arranged to cause attenuation and reflection of the sound waves back and forth towards the sound wave dissipater; the expansion chamber having a chamber: conveyer cross-sectional area ratio and chamber length characteristics allowing maximum transmission loss for a given frequency. The expansion chamber has an exit to allow fluid containing attenuated sound waves to escape therefrom.

The invention discloses a vibration isolation suspension. The vibration isolation suspension comprises an outer shell, a rubber lining and a chip, wherein the chip and the rubber sleeve are formed integrally; the outer shell, the rubber lining and the chip are enclosed into a first damping liquid chamber, a second damping liquid chamber and at least one flow channel; the flue channels are used for communicating the first damping liquid chamber and the second damping liquid chamber; and the first damping liquid chamber and the second damping liquid chamber are formed on two sides of the chip. According to the vibration isolation suspension, the first damping liquid chamber and the second damping liquid chamber are formed on two sides of the chip and are communicated through the flow channels, a damping liquid is exchanged between the first damping liquid chamber and the second damping liquid chamber through the flow channels when an automobile generates vibration in a twisting direction, the flow channels can only be used for guiding the damping liquid on one side of the chip to the other side only by passing through or surrounding the chip, and the fluid flows in a reciprocating way, so that vibration in the twisting direction is reduced.

A multiplex signal system for use with a vehicle steering column assembly includes a steering wheel electronic module mounted to a steering wheel and a column electronic module mounted remotely from the steering wheel. The steering wheel electronic module includes a resistive switch network and a voltage controlled oscillator to transform activation by an operator of one or more steering wheel mounted controls, such as audio volume controls, into an oscillating signal having a frequency representative of the particular control that was activated. This oscillating signal is provided to the column electronic module, which utilizes an electronic processing device to determine which of the steering wheel mounted controls has been activated. Once this is determined, the electronic control module operates the electrical or electromechanical device, such as an audio system, that corresponds to the activated steering wheel mounted control.

A process for producing an acoustic device having a phononic crystal structure comprising inclusions produced in a first medium distributed in a matrix of a second medium, to block propagation of acoustic waves within a bandgap frequency band, includes: defining geometric parameters of said inclusions, which have walls contacting said matrix, making at least one non-zero first wall angle, to the normal of the plane of said structure, said geometric parameters including said first wall angle; determining a function relating to variation in frequency position of said bandgap with said wall angle or relating to variation in width of said bandgap with said wall angle; determining said at least first angle, for a selected frequency position and / or selected width of the bandgap, from the function or functions determined beforehand; and producing said inclusions having at least said first wall angle in said matrix formed by said second medium.