1005 results about "Microwave transmission" patented technology

A microwave applicator for insertion into living body tissue for use in microwave coagulation and ablation treatments includes a microwave transmission line extending between an attachment end of the applicator and an antenna toward an insertion end of the applicator with an outer conductive sleeve forming an enclosed cooling fluid space around the transmission line. Circulation of cooling fluid is guided in the cooling fluid space by a guide sleeve. A fluid circulation system provides a plurality of fluid supply connectors and fluid return connectors which can be connected and used with any number of applicators between one and the number of the fluid supply connectors provided by the system. A portion of the applicator inserted into the tissue can stick to the tissue to stabilize the applicator during treatment. A warning marking on the applicator can be used during track ablation to prevent ablation of the patient skin tissue.

Apparatus and method for plasma deposition of thin film photovoltaic materials at microwave frequencies. The apparatus avoids unintended deposition on windows or other microwave transmission elements that couple microwave energy to deposition species. The apparatus includes a microwave applicator with conduits passing therethrough that carry deposition species. The applicator transfers microwave energy to the deposition species to activate or energize them to a reactive state conducive to formation of a thin film material. The conduits physically isolate deposition species that would react or otherwise combine to form a thin film material at the point of microwave power transfer. The deposition species are separately energized and swept away from the point of power transfer to prevent thin film deposition. Suitable deposition species include precursors that contain silicon, germanium, fluorine, and/or hydrogen. The invention allows for the ultrafast formation of silicon-containing amorphous semiconductors that exhibit high mobility, low porosity, little or no Staebler-Wronski degradation, and low defect concentration.

Methods, simulations, and apparatus are provided that may be utilized for medical treatments which are especially suitable for treatment of benign prostatic hyperplasia (BPH). In a preferred embodiment, a plurality of separate microwave antennas are utilized to heat prostatic tissue to promote necrosing of the prostatic tissue that relieves the pressure of the prostatic tissue against the urethra as the body reabsorbs the necrosed or dead tissue. By utilizing constructive and destructive interference of the microwave transmission, the energy can be deposited on the tissues to be necrosed while protecting other tissues such as the urethra. Saline injections to alter the conductivity of the tissues may also be used to further focus the energy deposits. A computer simulation is provided that can be used to predict the resulting temperature profile produced in the prostatic tissue. By changing the various control features of one or more catheters and the methods of applying microwave energy, a temperature profile can be predicted and produced that is similar to the temperature profile desired for the particular patient.

The invention relates to a BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and a calibrating method thereof. The calibrating method comprises the following steps of: acquiring an electric signal of local reference light from a heterodyne photoreceiver on a basis of a traditional BOTDR for heterodyne coherent detection; transmitting the electric signal subjected to analog-to-digital conversion in a computer to be used as the optical power calibrating feedback quantity of the reference light; sending out an instruction by the computer to adjust the output power of a microwave source and change the optical power of the local reference light so that the difference between the optical power of the local reference light and the preset reference light power is smaller than a set value; calibrating the power; and detecting a BOTD signal. In the invention, the BOTDR in a working process can not be influenced by the working environment temperature, a microwave transmission line connecting the microwave source with an electro-optic modulator and different power responses of the electro-optic modulator on microwave signals of different frequencies, the error between the reference light power at different frequency points and the preset power is smaller than a set value, and the accurate measurement of the stress and the temperature is ensured.

The embodiment of the invention discloses a magnetic-field measurement device and a manufacturing method thereof as well as a magnetic-field measurement method. The magnetic-field measurement device comprises a combined optical fiber, monocrystal diamond particles, a microwave transmission line, a microwave generator, a laser device and a spectrometer, wherein the combined optical fiber is prepared by connecting two optical fibers; the monocrystal diamond particles are packaged between the end faces of the two optical fibers and provided with single NV colour centers; the microwave transmission line is arranged at the external wall of the combined optical fiber; the microwave generator is connected with the microwave transmission line; the laser device is connected with one end of the combined optical fiber; and the spectrometer is connected with the other end of the combined optical fiber; and exciting lights are input from one end of the combined optical fiber, and fluorescent lights of single NV colour centers are received from the other end of the combined optical fiber. In the invention, through carrying out measurement on magnetic fields by using the single NV colour centerspackaged in the optical fiber, the application of a confocal microscope system is avoided, the cost for finding the single NV colour centers is reduced, and the time and manpower are saved; and meanwhile, the magnetic-field measurement can be conveniently performed by using the single NV colour centers in any magnetic-field environment without being limited by the confocal microscope system.

Methods and apparatuses for directly charging capacitors in a down-hole pulsed power system used for electrocrushing drilling. An above ground power supply is directly connected to the capacitors. The power supply can be a switching power supply, a DC supply, or an AC supply. Capacitor voltage is monitored and controlled. The system reduces noise caused by coupling control signal cables and the power cable, and does not have the ground swing control problems of other charging schemes. The power may alternatively be provided by microwave transmission.

A transmission line microwave apparatus includes at least one nonreciprocal transmission line part, which includes a series branch circuit equivalently including a capacitive element and a shunt branch circuit equivalently including an inductive element. The nonreciprocal transmission line part has gyrotropic characteristic by being magnetized in a magnetization direction different from the propagation direction of a microwave, and has an asymmetric structure to a plane formed by the propagation direction and the magnetization direction. The nonreciprocal transmission line part has a propagation constant and an operating frequency set in a dispersion curve that represents a relation between the propagation constant and the operating frequency so that the propagation constant in the forward direction and the propagation constant in the backward direction have nonreciprocal phase characteristics different from each other. A microwave transmission line is constituted by cascade-connecting at least one non-reciprocal transmission line part between first and second ports.

A microwave applicator for insertion into living body tissue for use in microwave coagulation and ablation treatments includes a microwave transmission line extending between an attachment end of the applicator and an antenna toward an insertion end of the applicator with an outer conductive sleeve forming an enclosed cooling fluid space around the transmission line. Circulation of cooling fluid is guided in the cooling fluid space by a guide sleeve. A temperature sensor senses the approximate temperature of cooling fluid to indicate cooling fluid is circulating. A multiplexing and power splitting circuit provides outputs tuned for one or for more than one applicator to be attached and detects the number of applicators and correct connection. A cadence sound generator can be used in conjunction with depth markings on the applicator to provide substantially constant withdrawal of the applicator from the treated tissue after treatment to provide track ablation.

The invention discloses an impedance matching method for a gold bonding wire. The method comprises the following steps: establishing a gold bonding wire model; extracting model parameters in a circuit application frequency band; causing the gold bonding wire model to be equivalent to a TT-shaped low-pass filter network; fitting equivalent network parameters by using the extracted model parameters; and introducing the extracted model parameters into a to-be-matched schematic diagram and adding a Smith chart matching control. In the Smith chart, 2-4 sections of micro-strip wires are serially connected so as to establish a matching network; a load impedance is converted into an actual impedance by first to second sections; the actual impedance is converted into a source impedance by a third section which is a Lambda/4 converting wire, thereby achieving impedance matching; and a fourth section is a gradual changing wire used for transition. The impedance matching method has the advantagesof simple design concept, easiness in application, capability of saving a circuit board space, small frequency limitation, wide frequency band width and excellent compensation effect. The impedance matching method is used for interconnecting monolithic microwave integrated circuits, coplanar waveguides, microwave transmission lines or RF (Radio Frequency) grounding sides.

A patch antenna for operation within a high temperature environment. The patent antenna typically includes an antenna radiating element, a housing and a microwave transmission medium, such as a high temperature microwave cable. The antenna radiating element typically comprises a metallization (or solid metal) element in contact with a dielectric element. The antenna radiating element can include a dielectric window comprising a flame spray coating or a solid dielectric material placed in front of the radiating element. The antenna element is typically inserted into a housing that mechanically captures the antenna and provides a ground plane for the antenna. Orifices or passages can be added to the housing to improve high temperature performance and may direct cooling air for cooling the antenna. The high temperature microwave cable is typically inserted into the housing and attached to the antenna radiator to support the communication of electromagnetic signals between the radiator element and a receiver or transmitter device.

The invention discloses a frequency conversion compensating microwave frequency transmission system and method. A phase pre-compensated microwave transmission signal is loaded into a laser signal, thelaser signal is transmitted to a remote end through utilization of an optical fiber, and the remote end restores the laser signal into a frequency signal synchronous with a microwave reference frequency signal of a local end through detection. According to a specific process, after a local signal is transmitted to the remote end, frequency conversion is carried out on a detection signal of the remote end, the detection signal is returned to the local end, a return signal comprises phase noise imported into an optical fiber link; the return signal and the local transmission signal are respectively mixed with the local reference signal, comparison is carried out to acquire pre-compensation quantity and a crystal oscillator generating the transmission signal is controlled according to the compensation quantity, so phase compensation of high precision frequency transmission is finished. Compared with existing frequency transmission, the method mainly has the advantages that frequencies ofthe signals transmitted by the local end and returned by the remote end are different, the phase interference of strong signals of stations at the two ends for detected and received weak signals is avoided, and the frequency transmission stability is further improved.

High speed optical modulators can be made of k modulators connected in series disposed on one of a variety of semiconductor substrates. An electrical signal propagating in a microwave transmission line is tapped off of the transmission line at regular intervals and is amplified by k distributed amplifiers. Each of the outputs of the k distributed amplifiers is connected to a respective one of the k modulators. Distributed amplifier modulators can have much higher modulating speeds than a comparable lumped element modulator, due to the lower capacitance of each of the k modulators. Distributed amplifier modulators can have much higher modulating speeds than a comparable traveling wave modulator, due to the impedance matching provided by the distributed amplifiers.

The invention provides a piezoelectric polymer material comprising a helical chiral polymer having a weight average molecular weight of from 50,000 to 1,000,000 and optical activity, the piezoelectric polymer material having: crystallinity as obtained by a DSC method of from 20% to 80%; a transmission haze with respect to visible light of 50% or less; and a product of the crystallinity and a standardized molecular orientation MORc, which is measured with a microwave transmission-type molecular orientation meter at a reference thickness of 50 μm, of from 40 to 700.

The invention discloses a method and a device for forming a high-performance composite material structural member through a microwave-pressure tank. The device mainly comprises a cooling system (2), a gas storage tank (6), microwave transmission lines (9), microwave radiation antennas (10), a pressure safety valve (11), a polygonal multi-mode resonant cavity (14), a microwave generation and measurement module (17), a temperature measurement and control module (18), a vacuumizing and control module (19), a pressure measurement and control module (20), a power supply module (21), a material platform (23), a forming mold (24), a temperature sensor (26) and a tank body (28). The equipment is microwave forming equipment for the high-performance composite material structural member; a non-solidified composite material structural member is put into the equipment, and the high-performance composite material structural member can be quickly formed by technologies of vacuum bag vacuumizing, gas pressurization and microwave heating; the quality and the performance of the composite material structural member can be improved.

Plasma processing equipment capable of increasing the heat resistance of a wave guide by using a high dielectric material, comprising a processing container 44 formed to allow vacuuming, a loading table 46 installed in the processing container for placing a processed body W thereon, a microwave transmission plate 72 installed in an opening part at the ceiling of the processing container, a flat antenna member 76 for feeding microwave into the processing container through the microwave transmission plate, a shield cover body 80 earthed so as to cover the upper part of the flat antenna member, and a waveguide 90 for feeding the microwave from a microwave generating source to the flat antenna member, characterized in that the waveguide is formed of a high dielectric waveguide 94 using the high dielectric material, whereby the heat resistance of the waveguide can be increased.

A microwave ablation system incorporates a microwave thermometer that couples to a microwave transmission network connecting a microwave generator to a microwave applicator to measure noise temperature. The noise temperature is processed to separate out components the noise temperature including the noise temperature of the tissue being treated and the noise temperature of the microwave transmission network. The noise temperature may be measured by a radiometer while the microwave generator is generating the microwave signal or during a period when the microwave signal is turned off. The microwave ablation system may be configured as a modular system having one or more thermometry network modules that are connectable between a microwave applicator and a microwave generator. Alternatively, the modular system includes a microwave generator, a microwave applicator, and a microwave cable that incorporate a microwave thermometry network module.

The invention discloses a method, a device and a system for realizing time synchronization and relates to the field of communication for realizing high-precision time synchronization between a wireless base station and a network controller. The invention comprises the following steps of: receiving a first microwave frame including the sending time T1 of bytes in specific positions in the first microwave frame at a master unit side and acquiring the sending time T1; recording a time T2 on arriving at a slave unit by the bytes in the specific positions in the first microwave frame; sending a second microwave frame to the master unit and recording the sending time T3 of bytes in specific positions in the second microwave frame at the slave unit side; receiving a third microwave frame including a second time stamp which is used as a time T4 on arriving at the master unit by the bytes in the specific positions in the second microwave and acquiring the time T4; and calculating the time difference between a slave unit self clock and a master unit self clock according to T1, T2, T3 and T4, and adjusting self time according to the time difference. The embodiment of the invention is mainly applied to the process of microwave transmission.