276 results about "Matched load" patented technology

A load lock is provided for a semiconductor substrate processing system having a transport robot mounted therein. The load lock transport supplies substrates directly to a processing chamber without the need for a central transport robot. The load lock transport is a dual element robot designed for minimum clearance and space and operates within a matching load lock chamber of minimum volume.

Operational data is utilized to determine the FEXT interference induced by one line into the other DSL line. FEXT interference can be calculated using the NEXT interference measured between the two lines at the upstream ends of the loops and the downstream channel transfer function of one of the loops. Because the NEXT and transfer function constitute a linear time-invariant system, as does the FEXT interference between the lines, the NEXT interference and line transfer function can be multiplied (if in linear format) or added (if in logarithmic format) to approximate the FEXT interference between the lines. The collection of data, calculations and other functions performed in these techniques may be performed by a system controller, such as a DSL optimizer. An Xlog(u,n) quantity is a decibel-magnitude representation of the insertion-loss equivalent of FEXT transfer functions and is defined as the ratio of (1) a line u's source power into a matched load of 100 Ohms when no binder is present to (2) the power at the output of the subject line when line u is excited with the same source and the binder is present. Xlin(u,n) is the linear equivalent of Xlog(u,n). The Xlog(u,n) and Xlin(u,n) quantities may be represented in specific formats that assist in their use in DSL and other systems. When defined as a line's insertion loss, Xlin (or equivalently Xlog) does not include the effect of any transmit filter.

The invention discloses a cluster load balancing method and system. The method comprises steps as follows: classifying requests of clients; matching each classified request with a load balancing algorithm; acquiring data required by each load balancing algorithm from each server; calculating matched servers according to acquired data; allocating the requests to the servers. The matching flexibility of the load balancing method is improved, and the control on service unavailability is improved.

The invention relates to a testing device for dielectric coefficient of liquid or solid powder matter and testing and calculating methods, characterized in that in the device microwave signal source (1) is connected to the inputting end of slotting coaxial measurement segment (4) by circulator (2) and double directional coupler (3); after it passes through tested matter reflecting wave Pr and transmitting wave Pt are generated; reflecting wave Pr is transferred to matched load (6) by the double directional coupler (3) and the circulator (2); transmitting wave Pt is sent to the matched load (6) by directional coupler (5); incident wave Pi and reflecting wave Pr coupled by the double directional coupler (3) and transmitting wave Pt coupled by directional coupler (5) sent to double-channel power meter (7) respectively at two ends of slotting coaxial measurement segment (4) are sent to computer (8) finally so as to form an integration. It is tested and calculated by the following method. Tested matter is set in the measuring container (12) and amplitudes of reflection coefficient S11 and transmission coefficient S21 are read in computer (8) as testing value for use. Based on testing result dielectric coefficient of tested matter is searched by finite value algorithm combined with genetic algorithm.

Operational data is utilized to determine the FEXT interference induced by one line into the other DSL line. FEXT interference can be calculated using the NEXT interference measured between the two lines at the upstream ends of the loops and the downstream channel transfer function of one of the loops. Because the NEXT and transfer function constitute a linear time-invariant system, as does the FEXT interference between the lines, the NEXT interference and line transfer function can be multiplied (if in linear format) or added (if in logarithmic format) to approximate the FEXT interference between the lines. The collection of data, calculations and other functions performed in these techniques may be performed by a system controller, such as a DSL optimizer. An Xlog(u,n) quantity is a decibel-magnitude representation of the insertion-loss equivalent of FEXT transfer functions and is defined as the ratio of (1) a line u's source power into a matched load of 100 Ohms when no binder is present to (2) the power at the output of the subject line when line u is excited with the same source and the binder is present. Xlin(u,n) is the linear equivalent of Xlog(u,n). The Xlog(u,n) and Xlin(u,n) quantities may be represented in specific formats that assist in their use in DSL and other systems. When defined as a line's insertion loss, Xlin (or equivalently Xlog) does not include the effect of any transmit filter.

A method and system for matching a load tendered by a participating freight transportation company with an available truck of another freight transportation company for transporting that load, and then providing for monitoring of the matched load throughout transport, is implemented through a computer network. Each participating freight transportation company employs a similar computer system for managing its freight transportation operations, with each such computer system being operably connected to a central server through the network so as to allow for a seamless exchange of information and data between the computer systems.

The invention discloses low radio frequency impedance measuring equipment used for assisting radio frequency power amplifier development. The measuring equipment comprises a 50ohm coaxial matched load (1), a coaxial micro-strip transition connector (2), a low radio frequency impedance circuit (3) which is to be measured and additionally provided with two impedance-changing micro strips and a micro strip OSL correction printed circuit board (4); wherein the two impedance-changing micro strips (b and c) improve impedance level of a low radio frequency impedance micro strip circuit (a) to the level which can be accurately measured by a vector network analyzer, thus eliminating big error caused by measuring low radio frequency impedance directly; and a micro strip OSL correcting element eliminates testing error induced by coaxial test port and micro strip circuit transition part, thus measuring accuracy is further improved. The invention has the advantages of simple structure, good measuring accuracy and low cost.

The invention discloses a material complex permittivity testing system and method with a perforated short circuit plate, and belongs to the technical field of testing of the electromagnetic parameters of microwave or millimeter wave materials. The testing system comprises a coaxial cable-rectangular waveguide adapter, an isolator, a bidirectional coupler, a rectangular waveguide and the perforated short circuit plate, wherein the coaxial cable-rectangular waveguide adapter, the isolator, the bidirectional coupler, the rectangular waveguide and the perforated short circuit plate are connected in sequence. Testing signals output by a vector network analyzer are connected with the coaxial cable-rectangular waveguide adapter through a signal input coaxial cable. Testing signals output by the coupling end, away from the short circuit plate, of the bidirectional coupler are input to the vector network analyzer through a signal output coaxial cable. The coupling end, close to the short circuit plate, of the bidirectional coupler is connected with a matched load. According to the complex permittivity testing system, testing samples can be conveniently taken or put, system errors of a testing system adopting the rectangular waveguide terminal short circuit method are reduced, the testing efficiency is improved, and the service life of the testing system is prolonged.

The embodiment of the invention provides a data replicating method and a data storing system. The data replicating method comprises the following steps of: responding to a file reading request from a client; obtaining each file block number of a file to be read as well as the distribution information of each file block on a corresponding storage node; based on the distribution information and combined with the load degree information of the corresponding storage node, transmitting a whole set of file blocks to the client from multiple of storage nodes with matched load degree being lower than a first load degree threshold; and synchronizing all matched file blocks on the multiple storage nodes or transmitting the file blocks in queue to the client. As the embodiment of the invention is combined with the load degree information of the corresponding storage node and all the file blocks of the file to be read are distributed on corresponding nodes, the stability during high concurrency of the storage system is enhanced. Since the popularity of the file to be read is obtained dynamically and is stored in a dynamic distribution way, the capacities of the storage nodes are expanded on line and the user experience is further improved.

A method of and an arrangement for characterizing non-linear behavior of RF and microwave devices under test in a near matched environment. The method comprises the steps of exciting the device by an RF signal under different load conditions, measuring signal data at input and output ports of the device, verifying whether the measurement data meet predetermined quality criteria; calculating, from the measurement data, model parameters of a predetermined model for characterizing the non-linear behavior of the device, and verifying assumptions made in the characterization model by collecting additional measurement data and comparing same with data calculated from the model using the model parameters calculated. The load conditions are obtained by connecting to the output port of the device a matched load, an open, a short and a plurality of attenuators and delays.

A bipolar pulse generator includes two, two-conductor transmission lines coupled together with a load positioned between the two transmission lines. Each conductor of a transmission line we define as a segment. Two segments of one transmission line are charged and switchably coupled to two segments of the other transmission line to produce a bipolar pulse on the matched load. This bipolar pulse generator may be implemented in a flat or a folded design. The generator may include two transmission line structures coupled together with a load positioned between each transmission line structures. The first transmission line structure may include a stepped transmission line and an embedded transmission line segment. A switch may be coupled between the embedded transmission line segment and another segment of the transmission line structure. During operation, the first transmission line structure may be charged to a potential with the switch in the open position and, when the switch is closed, the charge on the first transmission line structure together with the second transmission line structure generates a bipolar pulse on the matched load.

Disclosed are a detecting clamp and device of microwave ceramic component and a method for detecting. The clamp comprises a microwave coplane waveguide, a sample position chip, detecting probe mount and a SMA adaptor. The microwave ceramic component detecting device comprises a microwave network analyzer, a microwave coplane waveguide testing clamp, input coaxial cables and output coaxial cables. The detecting method comprises steps of: taking open circuit and short circuit calibrating detection and match load calibration, then measuring data, and taking parallel and serial detection on the components for detecting, finally entering testing software for data analysis, calculation, process and storage.

The invention discloses a large-wide-angle low-standing-wave microstrip frequency sweep antenna based on a suspended strip slow-wave line. One end of a suspended strip meander line is used for feeding; the middle of the suspended strip meander line is connected with a plurality of narrow-edge directional couplers, wide-edge directional couplers and broadband circular branch line couplers; the coupling port of each coupler is connected with a section of compensation line; a separating port is connected with a matched load; each compensation line is also connected to an ultra-wideband small-size microstrip dipole antenna; and the tail end of the suspended strip meander line is directly fed into one ultra-wideband small-size microstrip dipole antenna through one section of compensated line. According to the invention, the standing wave is increased; the performance of the frequency sweep antenna is enhanced; the scanning airspace of the frequency sweep antenna is greatly widened; and the structure is simple.

The invention discloses a one-dimensional waveguide narrow slot antenna capable of scanning in order to solve the problems that an existing waveguide narrow slot array antenna unit is not even in radiation, difficult to achieve beam scanning in the single frequency condition, not high in power capacity and the like. The one-dimensional waveguide narrow slot antenna capable of scanning is composed of a rectangular slot waveguide, a sliding panel and a stepping motor. The rectangular slot waveguide is composed of a first narrow wall, a second narrow wall and two wide walls, one end of the rectangular slot waveguide is provided with a microwave feed-in port, the other end of the rectangular slot waveguide is connected with a matched load, n slots are formed in the first narrow wall of the rectangular slot waveguide, and the stepping motor is fixedly arranged on the second narrow wall. The sliding panel is embedded between the first narrow wall and the second narrow wall, and the sliding panel can slide in the direction perpendicular to the second narrow wall of the waveguide. According to the one-dimensional waveguide narrow slot antenna cable of scanning, each slot unit basically achieves even radiation, the purpose that the microwave beams scan in the one-dimensional direction under the single frequency working condition is achieved, large-scale array arranging capacity and high-power microwave field application potential are achieved, the structure is simple, and operating is convenient.

The present invention relates to a time-domain calibration method for an electromagnetic pulse magnetic-field probe. The method is used for calibrating an electromagnetic pulse magnetic-field probe in the time domain. The method comprises the steps of conducting the calibration test in a transmission line parallel-plate working space, connecting the tapered transition section of a parallel-plate transmission line and a pulse signal source with an adapter via coaxial cables, connecting the terminal of the parallel-plate transmission line with a matched load, connecting a digital oscilloscope with a standard antenna or a to-be-calibrated probe via a shielding radio frequency signal line, feeding a pulse voltage signal of the pulse signal source in the parallel-plate transmission line, forming a pulsed magnet field in the transmission line parallel-plate working space, recording a voltage signal waveform measured by the standard receiving antenna or the to-be-calibrated magnetic-field probe by the digital oscilloscope, and processing measured voltage signals according to a certain algorithm to obtain the time-domain transfer function of the to-be-calibrated magnetic-field probe. In this way, the time-domain calibration on the to-be-calibrated magnetic-field probe that is the same with the standard receiving antenna in frequency band can be realized.

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.

This invention relates to a microwave and millimeter wave broad band 3db orthogonal digital phase shifter including a 3db orthogonal directional coupler, in which, an isolation end corresponding to the input of the coupler is connected with a broad band standard 50 ohm matched load, the through end corresponding to the input of the coupler is connected with a port of a branch of a broad band matched single-pole double throw switch, K1 and K2 are two control ends of the switch, the control signal controls the input / output of the microwave and millimeter wave signals from a port of the switch or the other to let it input / output from the public end of the switch.

A bipolar pulse generator includes two, two-conductor transmission lines coupled together with a load positioned between the two transmission lines. Each conductor of a transmission line we define as a segment. Two segments of one transmission line are charged and switchably coupled to two segments of the other transmission line to produce a bipolar pulse on the matched load. This bipolar pulse generator may be implemented in a flat or a folded design. The generator may include two transmission line structures coupled together with a load positioned between each transmission line structures. The first transmission line structure may include a stepped transmission line and an embedded transmission line segment. A switch may be coupled between the embedded transmission line segment and another segment of the transmission line structure. During operation, the first transmission line structure may be charged to a potential with the switch in the open position and, when the switch is closed, the charge on the first transmission line structure together with the second transmission line structure generates a bipolar pulse on the matched load.

The invention discloses an all-digital compensation microwave radiometer, which comprises an antenna, a matched load, a microwave switch, a full-power radiometer, a digital control unit, a communication unit and a display unit. According to the cycle detection of the input voltage of the matched antenna and the antenna and the practical temperature of the matched load, the influence on the performance of the radiometer caused by the gain uncertainty of a radiometer system and local noise fluctuation is balanced out through the digital compensation operator of the digital control unit. The all-digital compensation microwave radiometer not only greatly increases sensitivity and long-term stability, but also has simple structure and small volume; moreover, the radiometer can work for a long time after initial calibration, thereby avoiding the inconvenience of cycle calibration on ground basis, vacuous basis and satellite basis and greatly increasing target observation time and scope.

The invention discloses a predistortion linearization device of a millimeter wave power amplifier and aims at providing the predistortion linearization device which is simple in structure, wide in bandwidth, good in stability and suitable for the millimeter wave high-power amplifier, wherein gain and phase are respectively adjustable. According to the technical scheme, a radio frequency signal is input to the input end of an orthocoupler through a radio frequency input port (1), and two paths of orthogonal signals are produced. The signal of one path enters a path I (6) through the straight end (2) of the orthocoupler, bias voltage is adjusted through a DC feed power supply (12), a component with the phase of non-linear conditions not distorted and amplitude distorted is obtained through a high-resistance wire (17) connected with a diode (16), and a signal with the characteristic of gain expansion is output. The signal of the other path enters a path Q (7) by being connected with the isolation end (4) of the orthocoupler and the coupling end of the orthocoupler of a matched load, and a signal with controllable amplitude is output. The two signals finally pass through a power synthesizer (8), then a signal with amplitude and phase both distorted is output, and the amplitude and the phase are respectively adjustable.

The invention discloses a micro-strip line absorption band-pass filter. The micro-strip line absorption band-pass filter is used for solving the problems that an existing LC absorption filter is not prone to being integrated with an active device and poor in compatibility. The micro-strip line absorption band-pass filter comprises two identical parallel coupled line directional couplers, two identical micro-strip pectinate line band-pass filters and a matched load. The micro-strip line absorption band-pass filter has the advantages of being compact in structure, high in working frequency band, wide in bandwidth, low in cost, prone to being integrated with the active device, good in compatibility and simple to design.

An adaptive impedance matching module having an adjustable impedance matching network with an input for receiving an RF power source and an output to be connected to an antenna, and first and second voltage measurement device configured to sense a voltage at respective first and second nodes on the impedance matching network. A network adjuster circuit is provided to switch the impedance matching network between a first state where first and second voltages are sensed on the respective first and second nodes and a second state where third and fourth voltages are sensed on the respective first and second nodes. Processing circuitry is provided which determines the matched load impedance based upon the first, second, third and fourth sensed voltages and including matching adjustment circuitry configured to adjust the matching impedance in the event the matched load impedance differs from a target load impedance by more that a predetermined amount.

The invention discloses a radio-frequency power detection circuit. According to the invention, a radio-frequency input signal is connected to a matching load and processed via a peak detection circuit based on a wave detecting diode; the output of the peak detection circuit is connected to a peak compensation circuit so that the compensated direct-current level is basically consistent with the radio-frequency signal peak; the output of a compensation circuit is connected to two input ends of a multiplying unit; and after filtering, amplification and zero compensation are performed on the output of the multiplying unit, a direct current signal in direct proportion to the power of a to-be-detected signal is obtained on the output end of the detection circuit. The power detection circuit is characterized in that all functional circuits are mutually independent and convenient to debug; the compensation circuit can be precisely adjusted and measurement precision degree is quite high in a certain frequency and power range; by setting circuit parameters, responding speed is flexible and adjustable; and over hundreds of milliwatt of radio-frequency signal power can be measured, and the power detection circuit has quite high practical value and attractive application prospect.

The invention discloses a miniature dual microwave and millimeter wave self-load I / Q quadrature filter which comprises a directional coupler and two microwave and millimeter wave filters. Wherein the directional coupler is in self connection with a matched load and the two microwave and millimeter wave filters are each of a strip line structure. The directional coupler in self connection with the matched load comprises a surface-mounted input / output interface, a broadside coupling strip line of a dual spiral structure and the matched load in self connection with an isolation port. The two microwave and millimeter wave filters each comprise a surface-mounted output interface and a six-level parallel resonance unit achieved through the strip line structure, and the structures are achieved through the multi-layer low temperature co-fired ceramic process technology. The miniature dual microwave and millimeter wave self-load I / Q quadrature filter has the advantages of being free of any external load, capable of generating a quadrature phase, easy to debug, small in insertion loss, light, small in size, high in reliability, good in electrical performance, good in temperature stability, good in electrical performance batch consistency, low in cost and the like, and is suitable for communication of corresponding millimeter wave frequency bands, satellite communications, and other occasions and corresponding systems having strict requirements for sizes, electrical performance, temperature stability and reliability.

The invention relates to fast switch and Blumlein line integrated high-pressure subnanosecond impulse source belonging to the technical field of impulse power. The impulse source comprises a main impulse switch, a Blumlein line, a fast switch, a transmission line and a matching load, wherein the fast switch 5 is positioned in the Blumlein line part; the other end of the transmission line is connected with the matching load 6; and radial sealing structures are adopted in the directions of the inner diameter and the outer diameter of an insulating separator 4 of an internal barrel of the Blumlein line so as to generate air-liquid separation. According to the subnanosecond impulse source disclosed by the invention, the fast switch 5 is moved to be arranged at the output end of the Blumlein line part from the inside of the impulse source transmission line, so that the number of insulated parts in the impulse source is reduced, and the structure is relatively compact; simultaneously, the air pressure in the fast switch 5 is equal to that in the main impulse switch 1, when the pressure in the impulse source is balanced, the stress on an insulating separator 2 and the insulating separator 4 of the main impulse switch can be reduced, and the reliability of the impulse source is improved; and finally the shape of output impulses of the impulse source is changed, and the similarly square high-pressure subnanosecond impulse output can be obtained from the matching load.

In a T network tuner, a variable shunt capacitor is provided between the signal input and ground that is ganged to the variable input matching capacitor. The operation is mechanically arranged such that, as one decreases the capacitance of the variable input matching capacitor, one increases the capacitance of the shunt capacitor to assist in high frequency matching, both to increase the maximum matchable load resistance and to decrease the minimum matchable load resistance. The variable shunt capacitor therefore assists at the high frequency ranges to bring the antenna impedances down to the transmitter output impedance, thus to establish an extended matching range tuner capable working between 160 and 10 meters.

The invention discloses a low-consumption low-minor lobe high-gain planar frequency scan antenna, which comprises three layers of planar dielectric substrates that are overlapped, wherein gaps are formed among the three layers of planar dielectric substrates; the three layers of planar dielectric substrates are fixed by plastic screws; the first layer of planar dielectric substrate comprises an antenna radiating element and a floor; the upper surface and the lower surface of the second layer of planar dielectric substrate are symmetrically arranged; the second layer of planar dielectric substrate comprises a slow-wave serpentine curve structure, a power divider, a transmission line feed structure and a matched load; the terminal of the slow-wave serpentine curve structure is connected to the matched load; the slow-wave serpentine curve structure is connected with the power divider; the transmission line feed structure is connected with the power divider; and the third layer of planar dielectric substrate is a floor. The antenna is low in consumption, and minor lobe, high in gain, simple in structure and convenient to implement.

The invention discloses a miniature photovoltaic array maximum power tracking device and a miniature photovoltaic array maximum power tracking method in the technical field of photovoltaic power generation. The tracking device comprises a sampling circuit, a master control unit, a switching tube driving circuit and a DC-DC converter, wherein the sampling circuit samples output current and output voltage of a photovoltaic array in real time and feeds the result into the master control unit; and the master control unit samples the output current and output voltage of the photovoltaic array and adjusts a duty ratio of a switching tube in the DC-DC converter so as to adjust the matched load of the photovoltaic array in real time; therefore, the photovoltaic array outputs the maximum power. Due to the adoption of a digital circuit, the device is not influenced by an external environment, and is high in tracking accuracy and high in stability.