134 results about "Microwave range" patented technology

A system, method, and apparatus for detecting at least one condition of interest relating to a tube, e.g. the presence of an air bubble. In some embodiments, the sensor includes antennas, a split-ring resonator, a frequency generator capable of generating frequencies in the microwave range, and a detection component. The detection component may estimate at least one parameter of received microwave energy in order to determine if a condition of interest exists.

A miniaturized antenna is described with at least a ceramic substrate (10) and a metallization, particularly designed for use in the high-frequency and microwave ranges. The antenna is characterized in that the metallization is a surface metallization which is formed by a feed terminal (12) for electromagnetic energy to be radiated, by at least a first metallization structure (30), and by a conductor track (20) extending along at least part of the circumference of the substrate (10), which track connects the feed terminal to the at least one first metallization structure (30), which first metallization structure (30) comprises a first conductor track portion (31) extending from a side of the substrate lying opposite the feed terminal (12) towards the feed terminal and a first metallization pad (32). The antenna can be provided on a printed circuit board by surface mounting and has a great impedance and radiation bandwidth, so that it is particularly suitable for use in mobile telephones operating in the GSM and UMTS bands.

An end effector structure (e.g. jaws structure or similar), configured with an internal antenna for delivery of electromagnetic energy in microwave range to a straight, curved or circular end effector structure in which the portion of end effector structure includes a microwave absorbing material that absorbs microwave energy emitted by the antenna and transfers microwave energy into the heat. Such end-effector also includes surgical fasteners or staples for strengthening tissue, providing a hemostasis, tissue joint and/or welding. The microwave antenna is connected by a coaxial cable with a microwave generator. The heat generated in the microwave absorbing material is applied to the treated material (e.g. tissue) by means of capturing material in the end effector (jaw structure) and heating the tissue to the desired temperature either before, during or after a stapling procedure.

This process occurs in the presence of activated carbon or its equivalent by decomposing adsorbed hazardous materials, such as hydrazine and microorganisms, on the carbon surface by radiofrequency energy in the microwave range at near ambient conditions of temperature and pressure. Further microwave oxidation to nonhazardous gases occurs in the presence of a microwaves enhanced oxidation catalyst.

The invention belongs to the field of microwave photonics, and discloses a system and method for frequency tunable microwave phase shifting. The method comprises the following steps that after a continuous light carrier is splitted, one beam of the continuous light carrier is processed by a MZ Mach-zehnder, and double-sideband optical signals restrained by the carrier are produced; the other beam of the continuous light carrier is processed by a phase modulator, and phase-shifted light carrier signals are produced; two beams of light signals are combined in a wave mode, one one-step sideband is removed through a tunable micro-ring filter in a filtering mode, a frequency-moved carrier signal and a phase-shifted carrier signal are obtained, photovoltaic conversion is carried out through a photoelectric detector, and a phase shift microwave electrical signal is produced; the resonant frequency of the tunable micro-ring filter is equal to any one-step sideband of the two one-step sidebands output by the MZ Mach-zehnder by changing the frequency of an input voltage drive signal and the resonant wavelength of the tunable micro-ring filter, and the frequency of the phase shift microwave signal is changed. The system and method for the frequency tunable microwave phase shifting is stable in output performance, fast in phase shift adjusting response, small in output microwave range fluctuation and continuously adjustable in wide frequency range.

A system and method for operating an amplifier system is provided. The amplifier system includes an input providing a direct coupling configured to receive a high-frequency input signal having a frequency in at least one of a radiofrequency (RF) and microwave range. The amplifier system also includes an amplifier including a dielectric material separating at least two superconducting layers forming an amplifier loop configured to receive the high-frequency input signal and deliver an amplified signal. The amplifier system includes an output providing a direct coupling configured to deliver the amplified signal.

A method for detecting an intruder in a protected space that uses a microwave frequency sensor to determine an accurate distance measurement to the intruder. The accurate distance measurement reduces the false alarms typically associated with microwave frequency sensors due to motion outside the protected space and vibration within the protected space. The motion detector transmits three microwave frequency signals of different frequencies in order to eliminate an ambiguity problem when determining the accurate distance measurement. The accuracy of the intruder distance measurement may be determined with greater resolution by reiteratively transmitting and evaluating microwave frequency signals of different frequencies. The motion detector of the present invention may include a PIR sensor. The accurate distance measurement allows the motion detector to precisely set signal threshold levels for the microwave frequency detector and the passive infrared detector to reliably detect an intruder while discriminating against an animal or other moving object.

The invention discloses a repeater antenna for use in point-to-point applications in telecommunications systems in the microwave range, intended for connecting transmissions from a first radio unit at a first site to a second radio unit at a second site. The repeater antenna is essentially plane, and is designed as a traveling wave antenna with at least a first and a second antenna beam, so that the first beam can be used for transmissions to and from said first radio unit, and the second beam can be used for transmissions to and from said second radio unit.

A system for measuring the range to an RFID tag including situations containing high clutter and multi-path signals is disclosed. The system includes an RFID reader; an RFID tag; and a coordinated pulse compression radar system. In the system the RFID reader causes the tag to respond to received signals in a first backscatter state at a first time and a second backscatter state at a second time. The pulse compression radar system transmits short pulses coordinated by the backscatter state of the RFID tag and the system creates a differential signal comprised of the differences between radar signals obtained during the first and second states of the tag to obtain an uncorrupted measure of a round trip time of flight of said radar pulses between the pulse radar system and the RFID tag.

The present invention provides an adaptive microwave oven capable of entering an operation mode which avoids interference with a communication device either upon detection of a communication from a communication device (e.g., a cordless telephone) operating in a microwave frequency range, or upon receipt of a command indicating the operation of a microwave device such as a cordless telephone through a suitable network (e.g., a piconet using BLUETOOTH Technology). In one embodiment, a cooking mode of a microwave oven is paused (or significantly reduced) to best avoid interference with microwave signals between a remote handset and a matching base unit of a cordless telephone. The activity of microwave communications within the vicinity of the adaptive microwave oven can be determined, e.g., using a passive cordless telephone receiver which detects communication activity in the microwave range, or using direct communications from the cordless telephone using a suitable wireless network, e.g., a piconet using BLUETOOTH technology. In another embodiment, the frequency of an adaptive microwave oven capable of generating microwave energy at any of a plurality of microwave frequency ranges is controlled in accordance with the microwave frequency used by an electronic device (e.g., a cordless telephone) in the vicinity of the adaptive microwave oven. In this embodiment, a cordless telephone receiver can provide a controller for the adaptive microwave oven with passively detected information regarding the frequency of communication traffic in the vicinity of the microwave oven, or a wireless network can be used to provide frequency information directly between the relevant electronic device (e.g., cordless telephone) and the adaptive microwave oven.

The invention relates to phase-shifting cells constituting the passive reflectarrays of antennas with a reconfigurable transmission direction, transmitting in the microwave range. More particularly, the invention describes, within the context of phase-shifting cells of the type having dipole strands angularly distributed in a star configuration, a novel type of switch consisting of a microelectromechanical device essentially comprising a suspended micromembrane which, under the action of an electrostatic force caused by a control voltage, deforms sufficiently to ensure electrical connection between the strands, making it possible to form a dipole in the desired orientation. In one particular embodiment, the micromembrane can be likened to one of the plates of a capacitor and its deformation corresponds to a substantial increase in the capacitance of this capacitor, thus providing the electrical connection. This switch technology has the advantages of greater fabrication simplicity and of enhanced performance compared with the known technologies. The invention provides the main geometrical and technological characteristics for obtaining optimized performance.

A system for measuring range to an RFID tag including situations containing high clutter and multi-path signals is disclosed. The system includes an RFID reader; an RFID tag; and a coordinated signal compression radar system. The reader causes the tag to respond to received signals in a first backscatter state at a first time and a second backscatter state at a second time. The signal compression radar system transmits signals coordinated by the backscatter state of the tag and creates a differential signal comprised of the differences between radar signals obtained during the first and second states of the tag to obtain an uncorrupted measure of a round trip time of flight of said radar signals between the radar system and the RFID tag. The radar may use signals typical of pulse compression radar systems such as chirp modulation or Orthogonal Frequency Domain Modulation (OFDM), either pulsed or semi-continuous.

Pillow with automatic height adjustment comprises: sensor, pillow, lifting mechanism. The wire is installed on one side of the pillow. The sensor is installed on one side of bed or the bed head. The sensor is human body infrared spectrum sensor or active infrared launching and accepting sensor or ultrasonic ranging sensor or microwave ranging sensor. The wire is the sensitive element of the resistive sensor or capacitive sensor. The input terminal of the relay connects to the output terminal of the sensor. The output terminal of the relay is series or parallel with the control switch of the lift mechanism of the pillow. The pillow automatically changes the height of the pillow following the change of the sleep gesture so as to accord with the physiological curve of the human cervical vertebra.

The invention discloses a method for quickly detecting the fat content of bovine milk based on a dielectric spectrum technique. According to the method for quickly detecting the fat content of the bovine milk based on the dielectric spectrum technique, dielectric spectrums (relative dielectric constant spectrums and dielectric loss factor spectrums), in certain one radio-frequency/microwave range of one batch of bovine milk samples are obtained by utilizing a network analyzer (or an impedance analyzer) and a coaxial probe; characteristic dielectric variables which express the fat content of the bovine mink are extracted from the dielectric spectrums; linear or nonlinear detection models for detecting the fat content of the bovine milk are established based on the dielectric spectrums in the whole radio-frequency/microwave range or the extracted characteristic dielectric variables; the models are inspected; the model of which the prediction-set root-mean-square error is minimal is used as an optimal model for detecting the fat content of the bovine milk. The dielectric spectrum of a bovine milk sample of which the fat content is unknown is measured; the numerical values of the characteristic dielectric variables are substituted into the optimal model, so that the fat content of the sample can be calculated. The method for quickly detecting the fat content of the bovine milk based on the dielectric spectrum technique has the advantages that the detection is convenient and quick, the operation is simple, the precision is high, and the on-line and real-time detection can be realized.

A system and method for treating biological tissues with EM energy in the millimeter or microwave range utilizes a needle to position a source of EM radiation proximate the tissue to be treated. An absorption aid such as sterile water or saline may be used in an embodiment of the invention to aid in absorption of the incident EM energy in the area of interest. In an embodiment of the invention, the EM energy is tuned in wavelength and power to effect optimum treatment with minimal damage to surrounding tissues.

A feed window for a low noise block converter feedhorn incorporated into a microwave-range antenna assembly is formed from a thermoplastic polymer composition containing a hydroscopic-effective amount of a high molecular weight siloxane.

The invention discloses a rapid detection method of the milk protein content based on a dielectric spectrum technique. According to the rapid detection method, dielectric spectra (a relative dielectric constant spectrum and a dielectric loss factor spectrum) of a batch of milk samples within a radio frequency/microwave range are obtained by utilizing a network analyzer (or an impedance analyzer) and a coaxial probe, characteristic dielectric variables which express the milk protein content are extracted from the dielectric spectra, linear or nonlinear prediction models which are used for predicting the milk protein content are established on the basis of the dielectric spectra or the extracted characteristic dielectric variables within the whole frequency range, the models are inspected, and the model of which the root-mean-square error is the minimum is used as the optimum model for predicting the milk protein content. Data of the dielectric spectra under unknown characteristic frequency of the milk samples are substituted into the optimum model, so that the protein content of the samples can be calculated. The rapid detection method has the advantages of rapidity in detection, convenience, high precision, simplicity in operation and capability of real-time online detection.

Wet oxidation is enhanced in the presence of carbonaceous material by oxidizing adsorbed organic materials, such as hydrazine and various solvents which may contain, or have dissolved or mixed compounds containing, chlorine molecules, on the carbon surface by radiofrequency energy in the microwave range at near ambient conditions of temperature and pressure. The discharged water is substantially environmentally clean.

The invention relates to the field of microwave absorbing materials. A 3-band switchable metamaterial microwave absorb/reflector is composed of metamaterial unit crystal cladding continuously and periodically arranged, and each metamaterial unit crystal cladding comprise a metal base plate layer, a dielectric substrate layer and a metal pattern layer, wherein that metal pattern layer is composed of an open straight cross structure, an open windmill structure and an open square ring structure. Seven absorption effect and one total reflection effect can be realized in a certain microwave range by meticulously design that structure of the resonant unit and the feeding network and controlling the state of the diode at different positions.

The invention relates to a microwave oven taking the microwave energy as the heating source, which realizes the functions of implementing the really significant fry, stir-fry, etc. with the microwave through the form of increasing a sub-chamber on the basis of the existing microwave oven and through the adoption of heat energy conversion principle of the microwave. The invention comprises a magnetron for producing the microwave, a waveguide, a resonant chamber and a wave absorbing boiler, and the microwave energy is converted into the heat energy through the wave absorbing boiler; the wave absorbing boiler is independent and open, and one of components of the resonant chamber.

The invention provides a method for curing artificial stone through microwave heating. The method comprises the steps that A, raw materials of the artificial stone are injected into a mold (or inner mold) after being burdened, and artificial stone which is not cured is formed; B, the artificial stone and the mold (or inner mold) are put in a microwave curing cavity together; C, the artificial stone in the microwave curing cavity is heated through microwaves and made to be completely cured, and the frequency of the microwaves ranges from 300 MHz to 1,120 MHz; D, the microwave curing cavity is opened, and artificial marble and the mold (or inner mold) in the microwave curing cavity are taken out; E, demolding is carried out, and the cured artificial marble is released out of the mold (or inner mold). The individual microwave curing cavity is designed, and the large-size artificial stone can be cured fast through the characteristic that the microwaves with the specific frequency of 300 MHz to 1,120 MHz are large in penetration depth.