127results about How to "Fast tuning" patented technology

An electronically tuned, absorptive, low-loss notch filter with high RF power handling capability is obtained using a four-port quadrature hybrid coupler connected to a matched pair of band pass resonator devices and resistive terminations. The notch filter design uses series-only tuning elements for the band pass resonator devices to raise the RF power handling of the band pass resonators far above conventional techniques while also being tunable at high speeds. The notch filter architecture and method can be used for interference cancellation in a wide range of wireless technologies, such as cellular phone, wireless routers, hand-held radios, satellite communications, and any other environments where there are a number of wireless technologies in close signal proximity.

A fuzzy logic control arrangement is provided for an impedance match network of the type that is typically employed between a source of RF power at a given impedance, e.g., 50 ohms, and a non-linear load whose impedance can vary in magnitude and phase, e.g., an RF plasma. The fuzzy logic controller fuzzifies the phase and the magnitude error signals. The error signals are applied to a fuzzy logic interference function based on a number of fuzzy sets. The values of the error signals enjoy some degree of membership in one or more fuzzy sets. Fuzzy logic rules are applied to the phase and magnitude error signals. In a defuzzification stage, drive signal values are obtained for moving the tuning elements of the variable impedances. The drive signal values are weighted according to respective fuzzy inference functions for which the error signals enjoy membership. Then the weighted drive signal values are combined to produce output drive signals.

A wavelength tunable laser comprising a laser diode and a closed external cavity formed by one or more optical resonators either horizontally or vertically coupled to adjacent waveguides. The optical resonator primarily functions as a wavelength selector and may be in the form of disk, ring or other closed cavity geometries. The emission from one end of the laser diode is coupled into the first waveguide using optical lens or butt-joint method and transferred to the second waveguide through evanescent coupling between the waveguides and optical resonator. A mirror system or high reflection coating at the end of the second waveguide reflects the light backwards into the system resulting in a closed optical cavity. Lasing can be achieved when the optical gain overcomes the optical loss in this closed cavity for a certain resonance wavelength which is tunable by changing the resonance condition of the optical resonator through reversed biased voltage or current injection. Multiple optical resonators may be used to reduce the lasing threshold and provide higher power output. With monolithic integration, more optical devices can be integrated with the tunable laser into the same substrate to produce optical devices that are capable of more complex functions, such as tunable transmitters or waveguide buses.

The invention discloses a miniature F-P (Fabry-Perot) cavity tunable filter and a method for manufacturing the same. The miniature F-P cavity tunable filter comprises a substrate. An antireflection film is attached to one surface of the substrate, a first bragg reflector is attached to the other surface of the substrate, and a first electrode and a second electrode are attached onto the first bragg reflector; four metal piers are attached onto the first electrode, and a bridge surface is attached onto the four metal piers; the bridge surface comprises four cantilever beams and a movable diaphragm, each cantilever beam is L-shaped, one end of each cantilever beam is perpendicularly fixedly connected with the corresponding metal pier, and the other end of each cantilever beam is connected with the movable diaphragm; the movable diaphragm is square, and a second bragg reflector is inlaid in the center of the movable diaphragm; the first bragg reflector and the second bragg reflector form a resonant cavity of an F-P cavity; after the miniature F-P cavity tunable filter is powered on, the four cantilever beams elastically deform and can drive the movable diaphragm and the second bragg reflector to move in the direction perpendicular to the first bragg reflector, so that the length of the resonant cavity is changed, and a tunable function of the filter is realized. The miniature F-P cavity tunable filter and the method have the advantage that the filter is wide in tunable range and high in response speed.

This invention is a compound tunable semiconductor laser, including a substrate with locating groove etched on it; a laser in the location groove; a spinal wave-guide etched on the substrate, and there is circle rectangle groove on the spinal wave-guide; a Prague grating forms through the cycle rectangle groove on the spinal wave-guide, the Prague grating and the laser use automatic collimation method to couple each other; an electrode forms on the Prague grating, this electrode is a heating electrode and utilizes heat luminous effect to change the reflecting wave length of the Prague grating; a thermistor with minus temperature coefficient on the substrate; a V-shaped groove is on one end of the substrate to fix the fiber.

The invention discloses an adaptive adjustment and optimization method of link quality. For the link of a high-speed serial interface SerDes (Serialzer-Deserializer), the method adds PRBS (Pseudo Random Binary Sequence)-31 pseudo-random code generation/checkout into a de-emphasis balancing process of the high-speed serial interface, an error rate and temperature change are taken as the end judgment signs of DFE (Decision Feedback Equalization), and a fixed flow of high-speed SerDes link quality adjustment and optimization is formed. The method can effectively improve the transmission quality of the SerDes link, obviously lowers the transmission error rate so as to improve the transmission performance of a chip bus, is high in automation degree, and has the characteristics of high link adjustment and optimization speed, good effect and the like.

The invention discloses an inductance coupling plasma processing chamber of an automatic frequency tuning source and a bias radio frequency power source. The inductance coupling plasma processing chamber comprises a processing chamber body, a source radio frequency power source and a bias radio frequency power source, a cathode is arranged at the bottom of an inner cavity of the processing chamber body, a plurality of source coils are arranged at the top of the inner cavity of the processing chamber body, a circuit of the source radio frequency power source is connected with the source coils, a circuit of the bias radio frequency power source is connected with the cathode, the source radio frequency power source and the bias radio frequency power source can realize automatic frequency tuning and can respond to and match with changes of load resistance, the circuit between the source radio frequency power source and the source coils is connected with a matching circuit, the circuit between the bias radio frequency power source and the cathode is connected with a matching circuit, the matching circuit are fixed, the processing chamber body comprises a detection circuit for detecting the load resistance and a control circuit in circuit connection with the detection circuit, and the source radio frequency power source and the bias radio frequency power source are correspondingly in circuit connection with control circuits respectively. The source radio frequency power source and the bias radio frequency power source have functions of automatic frequency tuning, and the source radio frequency power source and the bias radio frequency power source input into the processing chamber body through frequency sweeping and electric tuning are high in tuning speed and wide in tuning range.

The invention relates to a novel high-performance conformal array antenna, and solves the technical problems of low gain, narrow bandwidth and poor anti-interference capability. The antenna comprisesconformal array antenna units arranged in an array, wherein the conformal array antenna units use a traveling wave antenna feeding structure with two-port feeding, and the size is reduced through thefractal technology, so that the radiation influence of a curved surface on the antenna units is reduced; a slot coupling feed structure is adopted to improve the bandwidth of the antenna units, reducethe surface wave loss of the antenna unit and enable the radiation element to be better isolated from the feed network. A liquid crystal tuning circuit is adopted to apply a liquid crystal material to an antenna unit; the liquid crystal equivalent dielectric constant is changed through electric tuning, so that the resonant frequency of the antenna unit is changed, the radiation characteristic ofthe conformal array antenna unit in a required frequency band is controlled, the contribution of different antenna units to a main wave beam is controlled, the anti-interference capability is enhanced, the problem is better solved, and the conformal array antenna can be used in an antenna.

The invention belongs to the technical field of microwaves and millimeter waves and provides a dual-mode reconfigurable filter based on a half-mode substrate integrated waveguide and a CSR structure,mainly to solve the problems that an ordinary tunable filter has large insertion loss and bias voltage of a PIN diode can not be directly added to the substrate integrated waveguide. The half-mode substrate integrated waveguide technology is adopted, an upper metal pattern layer comprises a half-mode substrate integrated waveguide copper clad layer, a DC bias circuit, an epsilon-type microstrip line and other structures. Two complementary circular spiral resonators (CSR) are arranged at two sides of the copper clad layer, through applying forward/reverse bias voltage, the PIN diode is conducted or cut off, the upper metal copper and the epsilon-type microstrip line are conducted or cut off, and finally, single dual passband switching is realized. The reconfigurable filter under the features is particularly suitable for a wireless communication system, and has the advantages of small size, low insertion loss, multiple transmission zero points, high out-of-band suppression, convenient DCfeed loading, quick tuning speed, convenient tuning and the like.

The invention provides a broad-stopband electrically-tunable dual-frequency band-pass filter comprising a metal microstrip line in the front, a dielectric board layer, a first input/output port, a second input/output port, ground metal vias and a metal coating arranged on the back of the dielectric board layer. The metal microstrip line in the front is composed of a uniform impedance resonator, a short-circuited stub and an input/output coupling line; a variable capacitance diode is loaded between the uniform impedance resonator and the short-circuit stub, forming a tunable structure; the tail end of the short-circuited stub is grounded through the ground metal vias. The broad-stopband electrically-tunable dual-frequency band-pass filter is compact in structure, allows dual-frequency tunable, is low in band-pass internal insertion loss and good in out-of-band rejection and has broad stopband.

The invention provides a tunable phase shift fiber grating based on a fiber bragg grating and a reflecting mirror, and relates to a phase shift fiber grating. The invention provides a tunable phase shift fiber grating based on a fiber bragg grating and a reflecting mirror, which has the advantages of narrow transmission peak line breadth, quick tuning, simple structure, high stability, low cost and the like, and can realize bandpass filtering in a transmission mode and effectively inhibit the out-of-band wavelength transmission power of the FBG. The tunable phase shift fiber grating comprises a single mode fiber provided with the fiber bragg grating, a single mode fiber of which one end is plated with the reflecting mirror, a sleeve and piezoelectric ceramics, wherein the single mode fiber provided with the fiber bragg grating and the single mode fiber of which one end is plated with the reflecting mirror are inserted in the sleeve, and a gap is reserved between the single mode fiber provided with the fiber bragg grating and the single mode fiber of which one end is plated with the reflecting mirror; one end of the single mode fiber of which one end is plated with the reflecting mirror and one end of the sleeve are fixed on the piezoelectric ceramics; and the piezoelectric ceramics can be controlled by current to tune the length of the gap, so that the aim of tuning the position of the transmission peak can be achieved by tuning the phase shift.

The invention discloses a multi-band tunable microstrip band-pass filter which comprises a three-layer structure: a front metal microstrip line, a middle dielectric plate layer, input and output ports and an earthing metal through hole, and a metal coating at the back of a dielectric plate, wherein the metal microstrip line is a symmetric resonator consisting of a half-wavelength uniform impedance line resonator and an open-loop dual-mode resonator; the two resonators share input and output coupling lines; and a variable capacitance diode is loaded between the tail end of the open-loop dual-mode resonator and the earthing metal through hole to form a tunable structure. The filter is compact in structure, low in passband insertion loss, steep in passband edge and high in selectivity, and meets a development trend of filter miniaturization.

The invention relates to the technical field of laser, and discloses a tunable laser. The tunable laser comprises a resonant cavity and a gain medium, wherein the resonant cavity internally comprises the components of: the gain medium, a collimator, an electro-optical deflector and a raster; wherein the gain medium, the collimator, the electro-optical deflector and the raster are arranged in an optical path. The electro-optical deflector turns resonant light to an angle of entering the raster, thereby realizing frequency selection. The tunable laser utilizes the electro-optical deflector and a shining raster for realizing wavelength tuning of a single-frequency laser, and has advantages of: simple and feasible structure, high reliability, low cost, high tuning speed, wide tuning range, etc.

Provided is a multi-wavelength tunable narrow-band filter based on a lithium niobate crystal. A multi-wavelength tunable narrow-band filter structure is formed by taking the lithium niobate crystal as substrate, Bragg waveguide gratings and no-raster waveguiding structures are prepared in a crossed mode in the x or y or z diction of the lithium niobate crystal, electrode structures are prepared on the two sides of no-raster waveguiding, and the filter structure is as shown in figure 1. The filter achieves the multi-wavelength tunable filtering function by means of the electro-optic effect of the lithium niobate crystal. The multi-wavelength tunable narrow-band filter has the advantages that multi-wavelength tunable filtering can be achieved by changing voltage applied to the electrode; the filter can achieve selection of the number of wave lengths obtained through filtration of the filter by selecting the number of voltage applied electrodes; by means of the electro-optic characteristic of the lithium niobate crystal, tuning speed is high, and the multi-wavelength tunable narrow-band filter has a wide application prospect.