101 results about "Microwave frequency range" patented technology

A method and apparatus (10) is provided which employs phase or amplitude modulated electromagnetic probing waves (20) (in optical or microwave frequency ranges or both) emitted toward a vibrating object (8). The optical and / or microwave probing signals (20) remotely irradiate an object (8) of interest. The object (8) reflects and / or scatters the probing wave (20) toward a receiver (22). The reflected / scattered modulated signal (24) is received with a remote sensor (receiver) (22). Vibration causes additional phase modulation to the probing wave (20). At the receiving end, the signal is demodulated to extract and analyze the vibration waveform (26,28). The present invention can be utilized for nondestructive testing, monitoring of technological processes, structural integrity, noise and vibration control, mine detection, etc.

A transistor bias circuit is provided that is capable of biasing an amplifier transistor having a control terminal, a current-sink terminal, and a current-source terminal in order to control inter-modulation and linearize the output corresponding to radio frequency and microwave frequency ranges. Additionally, an embodiment of the present circuit is capable of dynamic power control. The transistor bias circuit according to the present invention utilizes a leakage current to alter the electrical characteristics of the amplifier transistor. The bias circuit comprises a bias transistor having a control terminal, a current-sink terminal, and a current-source terminal. Additionally, at least one DC input port, at least one resonator element, a diode element, and a resistive element is provided.

A coaxial connection is electromagnetically shielded at an interface between a surface mountable coaxial connector and a planar circuit operating in the radio frequency (RF) and microwave frequency ranges. In addition or alternatively, the coaxial connection reduces a potential impedance mismatch associated with attaching a coaxial transmission line of the coaxial connector to a planar transmission line of the planar circuit.

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 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.

This invention describes a method by which Broadband Spectrum Analysis can be performed in the Rh and Microwave frequency range with significantly higher speed, accuracy, and flexibility than existing RF and Microwave Spectrum Analyzers. This is done by eliminating the need for the filtering of the incoming signal, a process called preselection that needs to track in frequency with the scanning local oscillator in the instrument. By eliminating this requirement, this invention makes possible the identification and analysis of very broadband signals in a single sweep using an Adaptive Sweep Methodology and a Simultaneous Sweep capability that the present invention makes possible.

A method is provided for using magnetic nanoparticles to enhance microwave therapies for treating cells and tissues. The nanoparticles are designed to transduce microwave radiation into heat and furthermore, the nanoparticles may include specific tissue targeting and other functionality for enhancing in situ effects. In one embodiment, nanoparticles are introduced into a tissue system and a microwave field is applied. The nanoparticles react to the microwave energy by releasing heat thus heating the tissue and inducing hyperthermia (below 50° C.) or thermotherapy (above 50° C.). The nanoparticles can be designed for optimal heat production response at specific microwave frequencies and / or ranges of microwave frequencies where these frequencies may span the entire microwave spectrum, namely 300 MHz (3108 Hz) to 300 GHz (31011 Hz).

Various methods of metering a multi-phase composition in a pipe using patch antenna(s), that operate in a radio or microwave frequency range, are disclosed including locating and then exciting the patch antenna(s) over a range of frequencies; measuring transmitted and reflected signals over time; estimating a shift in a resonant frequency from a baseline resonant frequency; then calculating a permittivity of the composition, based on the shift; and calculating a phase composition of the multi-phase composition. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.

The invention discloses a high-speed railway microwave communication network, which is used for realizing signal relay between a movement carrier internal communication network and a carrier external communication network on high-speed railways. The network comprises a plurality of rail base relay devices and at least one vehicle-mounted relay device, wherein the plurality of rail base relay devices are laid along the high-speed railway rails, are arranged within a rail construction limit and are used for realizing signal relay between the external communication network and the vehicle-mounted relay device; each rail base relay device has a coverage space; the at least one vehicle-mounted relay device is fixed on the carrier and realizes signal relay between a rail base relay device corresponding to the current coverage space and the carrier internal communication network; and the frequency range of the signal is limited in one or more sub-frequency ranges from 4 to 42 GHz. Because microwave frequency ranges are adopted for signal relay of internal and external networks, the microwave communication network has the advantages of stable channel and high communication capacity; and because the system is enclosed in the construction limit of the high-speed railway, the network has the advantages of high reliability, high universality, low cost and the like.

A method for preparing a onion carbon / MXene layered wave absorbing composite material comprises steps of: taking titanium silicon carbon as a raw material, corroding the titanium silicon carbon by using hydrofluoric acid with different concentrations, and then washing the corroded titanium silicon carbon with deionized water and drying the washed titanium silicon carbon to obtain an MXene material; uniformly dispersing the prepared MXene material in the deionized water by using a ultrasonic dispersion method to obtain a suspension of the Mxene material; uniformly dispersing the onion carbon nanomaterial in the deionized water by using the ultrasonic dispersion method to obtain a suspension of the onion carbon nanomaterial; alternately filtering the suspension of the Mxene material and thesuspension of the onion carbon nanomaterial to obtain the onion carbon / MXene layered wave absorbing composite material. The prepared onion carbon / MXene layered wave absorbing composite material has the advantages of light weight and low thickness, and has a good reflectivity in a microwave frequency range.

A method and apparatus is provided which employs phase or amplitude modulated electromagnetic probing waves (in optical or microwave frequency ranges or both) emitted toward a vibrating object. The optical and / or microwave probing signals remotely irradiate an object of interest. The object reflects and / or scatters the probing wave toward to a receiver. The reflected / scattered modulated signal is received with a remote sensor (receiver). Vibration causes additional phase modulation to the probing wave. At the receiving end, the signal is demodulated to extract and analyze the vibration waveform. The present invention can be utilized for nondestructive testing, monitoring of technological processes, structural integrity, noise and vibration control, mine detection, etc.

The invention relates to a high stop-band inhibiting multi-zero 2.4 GHz mini filter, comprising an input / output interface arranged on the surface, two parallel-resonance units, an interstage couplingelectric capacity and an inductance and two sets of zero set circuits; and all the parts are produced by low temperature co-fired ceramic technology. The mini filter has the advantages of small volume, light weight, high reliability, excellent electric property, linear change of phase frequency character, good temperature stability, excellent consistency of electric property indicator batch, low cost for multitudinous production and the like, especially applicable to Bluetooth transmission, industry, science and medication (ISM) frequency range transmission, corresponding microwave frequency range communication, digital radar, single soldier satellite movement, communication terminals, military and civil multimode and multipath communication system terminals, wireless communication hand-hold terminals and other corresponding systems with strict requirements on volume, weight, property and reliability.

The disclosed stripline resonator comprises two parallel metal ground plates 4, an inner conductor 5 between two plates 4, a metal short-circuit board 6 connected to with two ends of plate 4, and two coupling loops 7 on proper position of connected part of plate 4 and conductor 5 for input / output of microwave signal. The electromagnet parameter testing device for microwave film material comprises: a microwave signal source 1, a stripline resonator 2 with broad work frequency and small volume and testing error, and a SNA 3. This device can test the parameters in different microwave frequency range.

The invention relates to the field of nano materials, in particular to a nano-silver aqueous solution and an application method for applying the nano-silver aqueous solution to technical wood. According to the aqueous solution, deionized water is used as a solvent, nano-silver is used as a solute and dissolves in the deionized water, acrylic resin is used as a complexing agent and a stabilizing agent and dissolves in the deionized water, meanwhile a dispersing agent and a first reducing agent are added to the deionized water, and then the solution is formed, wherein the dispersing agent is triethanolamine, the first reducing agent is a hydrous ammonia aqueous solution, the concentration of nano-silver ranges from 50 ppm to 150 ppm, and the mass content of acrylic resin in the solution ranges from 1% to 10%. The application method includes the steps that the technical wood is fed to a vacuum tank filled with the nano-silver aqueous solution, and the vacuum tank is pumped until the vacuum degree ranges from -0.05 MPa to -0.01 MPa for 15 min to 20 min; pressure application is conducted, and pressure is applied to 0.2 MPa to 0.5 MPa for 18 min to 28 min; eventually, microwave processing is conducted for 1 min to 3 min, the microwave frequency ranges from 300 MHz to 950 MHz, and then the technical wood is taken out for drying. The nano-silver aqueous solution is good in stability and dispersibility, nano-silver can be more effectively permeated into the technical wood, and mold is fully defended.

Graphene / ferric ferrous oxide composite powder modified wave-absorbing cement is disclosed. The wave-absorbing cement includes graphene / ferric ferrous oxide composite powder, expanded polystyrene and Portland cement. In the wave-absorbing cement, the filling rate of the expanded polystyrene is 40-70 vol%, the particle size of the expanded polystyrene is 2-6 mm, and the volume content of the graphene / ferric ferrous oxide composite powder is 2-5%. The graphene / ferric ferrous oxide composite powder and the expanded polystyrene are doped in the cement, and absorption in the whole frequency range in a microwave frequency range of 8-18 GHz reaches -14.2 dB or above, and therefore the wave-absorbing property of the cement is enhanced.

A method for test of human exhaled breath by using laser spectrums of optical frequency combs is characterized by: employing two groups of optical frequency combs with different pulse repetition frequencies to beat each other so that frequency spectrum signals are reduced to a microwave frequency range; employing a simple conventional microwave detection method to obtain frequency spectrum absorption and phase information of the exhaled breath in the entire optical frequencies, thereby to obtain gas components and traces; and determining a patient's possible condition by the analysis of components and corresponding absorption coefficients of each gas spectrum curve. The method for test of human exhaled breath by using laser spectrums of optical frequency combs of the invention can quickly measure the spectrum of human exhaled breath in a wide range once and for all, achieving a short measurement time and accurate measurement to real-time changing samples. The method has advantages of being non-invasive, quantitative, safe, simple, convenient, quick, repeatable, etc., with sensitivity and specificity better than conventional bronchoscopy.

The invention discloses a band-stop filter based on artificial surface plasmons. The structure works in a microwave frequency range, and a metal structure is only adhered to the upper layer of a medium. The band-stop filter is fed by conventional coplanar waveguides, and transition structures between the coplanar waveguides and artificial surface plasmon waveguides are utilized to realize impedance matching and wave number matching between the two kinds of waveguides. According to the invention, two unit structures of double-edge wrinkling strip line artificial surface plasmon waveguides are used to form a new unit structure, a certain distance interval of periodic arrangement is formed between every two new unit structures, and a new artificial surface plasmon transmission line is formed. The transmission line is characterized in that, capacitance structures are introduced into the conventional double-edge wrinkling strip line transmission line, and a stop band can be introduced into the frequency band of the artificial surface plasmons, so that the function of the band-stop filter is realized.

The invention provides an electronic tag antenna suitable for ISO18000-6 / B / C and EPC GEN2 electronic tag standards and with high length-width ratio dimension property. Based on the conventional dipole antenna, branches of three types are loaded in the antenna, namely 1) an L-shaped bent branch is loaded at two ends respectively, 2) a loop branch is loaded on two sides of a middle feed point respectively, and 3) a vertical branch (22) is loaded between the middle feed point and the two ends respectively. By loading the three branches, high length-width ratio of the antenna can be achieved under the condition of meeting high antenna gain; and meanwhile, the real part and the virtual part of antenna impedance can be independently adjusted by changing the dimension of individual branches so that the impedance of different RFID chips can be adapted. The electronic tag antenna has a simple structure, flexible and adjustable characteristic impedance and high length-width ratio, and is suitable to be used in an environment with special limitation on the dimension of a tag; after dimension adjustment, the antenna structure can be used for UHF frequency range or microwave frequency range, and achieves good match with chips of numerous ASIC manufacturers at home and abroad.

Various methods of metering a multi-phase composition in a pipe using patch antenna(s), that operate in a radio or microwave frequency range, are disclosed including locating and then exciting the patch antenna(s) over a range of frequencies; measuring transmitted and reflected signals over time; estimating a shift in a resonant frequency from a baseline resonant frequency; then calculating a permittivity of the composition, based on the shift; and calculating a phase composition of the multi-phase composition. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.

The invention provides a microwave curing formation method for a laminated plate made of carbon fiber / epoxy resin composite materials. The microwave curing formation method for the laminated plate made of the carbon fiber / epoxy resin composite materials comprises the steps that a laid carbon fiber / epoxy resin prepreg laminated plate is placed in a vacuum bag, the upper / lower surface of the laminated plate is isolated from the inner wall of the vacuum bag through a plate mold, and the interior of the vacuum bag is vacuumized, so that the laminated plate is compacted by means of external atmospheric pressure; and then under the condition that the vacuum degree in the vacuum bag is maintained, microwave curing formation is conducted under at least one stepwise-increasing power, wherein the microwave frequency range is 2.25-2.65 GHz, the microwave power range is 40-400 W, and the total microwave radiation time is 50-100 min. In this way, the obtained microwave curing-formed carbon fiber / epoxy resin laminated plate has the characteristics of being smooth in surface and good in forming quality; and meanwhile, compared with a traditional thermocuring method, the cycle of the curing process is obviously shortened while uniform and complete curing is guaranteed, and approximate or higher glass-transition temperature and compression strength are achieved.

An apparatus having a bonding pad and a conductor is disclosed. The bonding pad may be formed in a conductive layer of an integrated circuit. The bonding pad generally has (i) a bond region, (ii) an interface edge sized to match a transmission line and (iii) a tapered region between the bond region and the interface edge. The interface edge may be narrower than the bond region. The tapered region generally has a non-rectangular shape that spans from the bond region to the interface edge. The conductor may be bonded to the bond region. The conductor is generally configured to exchange a signal with the bond region. The signal may be in a microwave frequency range.

A method and apparatus for producing a radio frequency absorbing (RFA) or perfect microwave absorbing (PMA) printed circuit board (PCB) is described herein. A metamaterial layer may be applied to a low dielectric substrate. Resistive and capacitive components may then be added to the metamaterial layer. The metamaterial layer may then be formed into an RFA or PMA PCB, which may comprise a multi-layered assembly for absorption of electromagnetic radiation in a targeted frequency range such as the microwave frequency range in the PCB.

Microwaveable container that provides for accelerated microwave cooking times and more uniform internal temperature distribution. The container is manufactured from a laminate structure, the laminate structure including a first layer of microwave-transparent material and a second layer of microwave-reflective material. The second layer has at least one aperture defined therein, the at least one aperture having a width dimension W, a length dimension L, and a perimeter dimension P. The aperture is sized such that at least one of the width dimension W or length dimension L is sized about an energy maximum. Accordingly, the width and / or the length dimension is defined as within ⅛λ of a predetermined dimension D. The predetermined dimension is equal to ¼λ+n(½)λ, wherein n is an integer and λ is a microwave wavelength associated with a predetermined range of microwave frequencies. Preferably, the predetermined range of microwave frequencies is between about 2.0-3.0 GHz.

The invention relates to an ultra-wideband micro band rejection filter, comprising an input / output interface suitable for pasting on a surface, five parallel resonance units and four series resonance units, the structure is implemented by multi-layer low-temperature co-fired ceramic technology. According to the invention, the ultra-wideband micro band rejection filter has the advantages of wide frequency coverage, small insertion loss, light weight, small volume, high reliability, good electrical property, good phase frequency characteristic linearity, good temperature stability, good batch consistency of electrical property, low cost and mass production; therefore, the ultra-wideband micro band rejection filter is particularly suitable for fields such as communication for corresponding microwave frequency range, a digital radar and a wireless communication hand-held terminal which have excessive demands on volume, electrical proper, temperature stability and reliability, and corresponding systems.

The invention relates to an intelligent counterfeiting bottle stopper which comprises a bottle stopper body and a radio frequency identification chip, wherein the chip is selected from chips with different working frequencies including low frequency, high frequency, ultrahigh frequency or microwave frequency range; and the radio frequency identification chip is encapsulated inside the bottle stopper body. The intelligent counterfeiting bottle stopper leads the information of wine to be stored in the bottle stopper, and utilizes radio frequency identification (RFID) technology to read the related information of the wine in the bottle stopper, thus leading the bottle stopper to become an identification carrier of the wine and having the intelligent counterfeiting function.

The invention discloses a no-reflection bandpass low-pass filter based on a transmission wire structure. The no-reflection bandpass low-pass filter comprises two absorbing resistors, a quarter wavelength terminal open end transmission line segment, a quarter wavelength terminal short-circuit transmission line segment and two input / output ports. The two absorbing resistors are placed in a close manner, The absorbing resistor is provided with one common end point and two independent end points. The quarter wavelength terminal open end transmission line segment is connected between the common endpoints of the two absorbing resistors. Two end points of the quarter wavelength terminal open end transmission line segment are respectively connected with the two independent end points of the two absorbing resistors. The two input / output ports are respectively connected with the independent end points of the two absorbing resistors. Through reasonably setting the resistance of each element, theno-reflection transmission wire type filter can be obtained, a bandpass and low-pass filtering function can be realized. The no-reflection bandpass low-pass filter is suitable for filter circuit realization in a microwave frequency range, and furthermore has advantages of low cost, easy machining property, stable performance, etc.

The invention provides a microwave phase shifter. The microwave phase shifter comprises a first medium sheet, a second medium sheet, a metal sheet, ferrites and a waveguide. The first medium sheet, the second medium sheet and the metal sheet are successively limited and are bonded and fixed through a conductive adhesive. A groove is formed in the surface of the second medium sheet in a dug manner. A microstrip line is pasted to the surface of the first medium sheet. Nematic liquid crystals are injected into a cavity formed by the groove and the first medium sheet. The outer surface of the first medium sheet and the outer surface of the second medium sheet are respectively provided with at least two layers of ferrites, and the ferrites are internally provided with excitation leads. The first medium sheet, the second medium sheet, the metal sheet and the ferrites are respectively arranged in an inner cavity of the waveguide. Two ends of the waveguide are respectively provided with first matching mediums and second matching mediums. Two ends of each of the first medium sheet and the second medium sheet are in contact with the first matching mediums, and two ends of each ferrite are in contact with the second matching medium, wherein the dielectric constant of the first matching medium is larger than that of the second matching medium. The microwave phase shifter is capable of realizing phase shifting in an ultra-wideband microwave frequency range.

The invention discloses a real time locating method for supporting TDOA (Time Difference Of Arrival), TOA (Time Of Arrival) and RSSI (Receive Strength Signal Indicator) modes. The method comprises the following steps of: (1) providing a locating label and a locating access point utilizing a microwave frequency range; (2) realizing real time locating and tracking of a target through real time locating embedded software and a signal processing algorithm; and (3) completing virtual door control, linear and planar locating algorithms and locating simulation software. In order to meet complex locating requirements on physical distribution processes, the invention realizes the real time locating method for supporting three main locating modes of the TDOA, the TOA and the RSSI and has the advantages of low power consumption, and suitability for door control, linear and planar locating application.

The invention discloses a sensor and device for detecting an analyte in a liquid. The invention relates to a sensor (1) for detecting an analyte in a liquid. The sensor consists of an antenna (13), covered with a layer of a molecularly imprinted polymer (12) capable of interacting with an analyte and inducing a variation in the characteristics of the antenna (13) within the microwave frequency range.