800 results about "Microwave technology" patented technology

A tar sand volatilizer system thermally removes petroleum crude oil from tar sands or shale oil. A series of heated augers or thermal screws are used to elevate material temperature gradually using conductive heat transfer. The thermal screws blades and auger case receive a heated fluid. The screws are driven by variable speed drive systems. The unit is sized for any throughput rate desired. Hot clean material discharges into a rotary cooler and re-hydrator unit. The exhaust gases are pulled through a high temperature filter collector for particulate removal. The particulate free petroleum vapor laden hot gas exits the filter house into a multi stage condenser system with water chillers where the vapor temperature is gradually cooled. A microwave upgrader system processes crude oil using catalyst injected microwave technology to produce a diesel like fuel oil in a continuous process stream.

The present invention relates to environment protecting technology, and is especially one kind of sludge drying treatment process. The present invention is one low-cost combined sludge drying and utilizing process integrating microwave technology, aerobic fermentation technology and heat pump drying technology. The present invention is suitable for treatment of different kinds of sludge, and the sludge product has wide applications, including use as organic fertilizer, use as the material for composite organic fertilizer and building material, use as fuel for incinerating garbage and heating boiler, etc.

The invention discloses an apparatus of generating microwave phase coding signals in an optical manner, and relates to the microwave technology field and the optical communication technology field. The apparatus is mainly applied to generating pulse compression signals in pulse compression radar. By means of the frequency shift characteristics of two parallel Mach-Zehnder modulators, the optical wavelength modulated by coding signals and the optical wavelength after a frequency shift are coupled to each other and then are detected through a photoelectric detector, in this way, phase coding microwave signals can be generated. The apparatus can produce binary, quaternary or multi-nary phase coding microwave signals. The generated phase coding microwave signals are wide in frequency adjustable scope, and have a great time-bandwidth product. A conventional phase coding microwave signal generation mode in the electric field is restricted by the bottleneck of the rate and the bandwidth of an electronic device, and the cost of generation of high frequency signals is extremely high or high frequency signals cannot be produced, the time-bandwidth product is limited, the reconstructiblity and the frequency adjustability of a system are poor, etc. The apparatus of the invention helps to overcome the above problems.

The invention discloses a solid-phase synthesis method of Sermaglutide. The method comprises steps of taking 2-Cl-Resin as an initial resin carrier; through a solid-phase synthesis method, orderly connecting the corresponding amino acids in a Sermaglutide sequence, wherein the lysine takes Dde-Lys (Fmoc)-OH as raw material; after linking the side chain raw material, removing Dde protection base of lysine, and performing continuous condensation reaction of a peptide chain; applying specific microwave technology treatment in a reaction process, and obtaining Sermaglutide-2-Cl-Resin; after cutting and settling Sermaglutide-2-Cl-Resin, freezing and drying, and obtaining crude peptide of Sermaglutide peptide. The method applies Fmoc solid-phase synthesis method, 2-Cl-Resin as solid phase carrier, and DIC / HOBt as the condensating agent, thus the lysine raw material is improved, the technical flow is largely simplified; the specific microwave synthetic technique is applied to the condensation reaction, thus the condensation efficiency is improved; the invention largely shortens the reaction time, improves the product yield, and has considerable economic application value and wide application prospect.

A microwave technology for treating tobacco leaves includes uniformly and orderly spreading tobacco leaves on conveying belt, heating to 50-70 deg.C while moistening it, separating out stems, microwave drying, and packing.

The invention discloses a quick roasting method of a fresh grosvenor momordica, which comprises the following steps: (1) classifying the ripe grosvenor momordica according to large, middle and small specifications and respectively placing into a special roasting tray used for a microwave oven; (2) placing the roasting tray filled with the grosvenor momordica into an intelligent microwave vacuum drying oven; and (3) determining the roasting time according to the weight of the grosvenor momordica and the power of the microwave oven and roasting, wherein the roasting temperature range is 20-40 DEG C, and the roasting time range is 30-150 minutes under the condition of vacuum degree less than -0.08MPa. In the method, the microwave technology for roasting is utilized, the roasting process is carried out at low temperature and constant temperature, the time consumption is short, the cost is low, and the fresh grosvenor momordica well keeps the bright yellow color and nutrition constituents and has good taste.

A method for applying microwave techniques to embroidered surgical implants including using microwave technology in the process of acetate removal and using microwave technology in the process of drying implants.

The invention belongs to the field of deep processing of starch, and particularly relates to a method for preparing resistant starch employing a microwave technology. The method is characterized by comprising the following steps: (1) preparing a starch emulsion from raw starch, and pregelatinizing the starch by virtue of microwave; (2) carrying out autoclaving treatment on the pregelatinized material at proper temperature and pressure, cooling materials, and hydrolyzing the starch with heat-resistant alpha-amylase and pullulanase until the chain length is 20-120DP; (3) paving the material on a flat plate, storing at 4 DEG C for 3-5 hours, heating the material to 30-50 DEG C by virtue of the microwave, cooling to a room temperature, repeating the temperature circulating process for 2-4 times until the moisture content of the starch is smaller than 14%, crushing and sieving to obtain resistant starch A; and (4) adding water to the resistant starch A, carrying out thermal treatment, adjusting the pH to be 1.5-2, carrying out oscillating reaction, adjusting the pH to be 7-8, adding pancreatin for enzymolysis, filtering and drying a filter cake by airflow until the moisture content is smaller than 14%, and crushing and sieving through a 100-mesh sieve, so as to obtain high-purity resistant starch B.

The invention discloses a method and a device for preparing a low-tar combustible gas through biomass gasification. The method comprises the followings steps of: pulverizing and gasifying biomass, and rapidly separating obtained gasification gas products and biomass char; heating and activating the biomass char in a microwave field; catalytically cracking tar in the gasification gas products by introducing the gasification gas products to pass through a treated biomass char layer, and carrying out secondary reaction on the gasification gas and the biomass char to produce the combustible gas. The device comprises a spiral-flow gasifier 1, a fixed bed reactor 2 and a microwave generator 3 which are connected through ducts, and the middle part of the fixed bed reactor is connected with the microwave generator 3 through a microwave duct 11. The microwave technology is applied to tar cracking, so that the problem of low heat transfer speed due to porous and loose biomass char is solved. Meanwhile, the cracking rate of tar and the secondary reaction activity between the char and the gasification gas are increased by using the 'hot spot effect' of microwaves. The device has the advantages of strong adaptability, simple and compact structure and easy enlargement.

The present invention relates to refractory material technology. By means of the fast homogeneous heating of microwave to material and reaction promoting effect of microwave field on nitriding reaction, homogeneously mixed silicon nitride, silicon powder and small amount of organic adhesive pressed into blank, stoved and defatted are heated with microwave of industrial microwave source of 900-3000 MHz frequency to 1100-1500 deg.c under the nitrogen atmosphere for nitriding reaction and sintering to densify. After cooling naturally to room temperature, combined refractory silicon nitride-silicon carbide material in specific shape and with bulk weight 2.65-2.80 g / cu cm, compression strength higher than 250 MPa, bending strength higher than 60 MPa, porosity lower than 15 % and excellent heat shock resistance is prepared.

The invention relates to a method for preparing an antioxidant peptide through ultrasonic-microwave synergetic enzymatic hydrolysis. The method comprises the following steps: (1), preparing an enzymatic hydrolysis substrate; (2), adding an alkali protease for enzymatic hydrolysis; (3), carrying out ultrasonic-microwave assistant enzymatic hydrolysis; and (4), after enzyme inactivation, centrifuging and separating a reaction solution, taking supernatant, freezing and drying to obtain antioxidant peptide powder. The method has the advantages that the ultrasonic technology, the microwave technology and the enzymology biology technology are combined. Compared with the peptide prepared by the conventional method, no chemical reaction is carried out, the change rate of bioactive substances is reduced, the utilization rate of organic solvents is reduced, the enzymatic hydrolysis time is shortened after the ultrasonic-microwave assistant enzymatic hydrolysis is carried out, and a test proves that the antioxidant capacity of the salmon peptide is remarkably enhanced. The method is simple in process, can be used for industrial production and has higher economic and social benefits.

The microwave hemorrhagic stroke detector includes a low power pulsed microwave transmitter with a broad-band antenna for producing a directional beam of microwaves, an index of refraction matching cap placed over the patients head, and an array of broad-band microwave receivers with collection antennae. The system of microwave transmitter and receivers are scanned around, and can also be positioned up and down the axis of the patients head. The microwave hemorrhagic stroke detector is a completely non-invasive device designed to detect and localize blood pooling and clots or to measure blood flow within the head or body. The device is based on low power pulsed microwave technology combined with specialized antennas and tomographic methods. The system can be used for rapid, non-invasive detection of blood pooling such as occurs with hemorrhagic stoke in human or animal patients as well as for the detection of hemorrhage within a patient's body.

The invention discloses a microwave photonic zero-intermediate-frequency receiving device and method. The method relates to the technical field of microwave and the technical field of optical communication. The method is as shown in the drawings. The device comprises a laser (LD), a polarization multiplexing Mach-Zehnder modulator (PDM-MZM), an erbium-doped optical fibre amplifier (EDFA), a wavelength division multiplexer (WDM), polarization controllers (PCs), a polarization beam splitter (PBS) and balance photoelectric detectors (BPDs). Modulation and polarization multiplexing of radio-frequency (RF) and local oscillator (LO) signals are carried out by utilization of the PDM-MZM; the WDM separates upper and lower optical sidebands; the PCs are respectively utilized for adjusting the polarization states of optical signals; and finally, the two BPDs respectively output I-channel and Q-channel baseband signals. By means of the microwave photonic zero-intermediate-frequency receiving device and method disclosed by the invention, zero-intermediate-frequency receiving is realized through a photonic method; the electronic bottleneck in the traditional electric field technology can be overcome; and the microwave photonic zero-intermediate-frequency receiving device has the advantages of being wide in working band, high in IQ balance degree, inhibited in direct-current offset and even-order distortion, electromagnetic-interference-resistant and the like.

The invention discloses a process method for quickly preparing a soybean antioxidant peptide, belonging to the technical fields of deep processing of agricultural and sideline products and comprehensive utilization of byproducts thereof, and relating to the process method for quickly preparing the soybean antioxidant peptide by using a microwave technology. According to the process method, soybean protein concentrate powder with protein content of 70 percent is used as a raw material, the material passes through a microwave extractor through processes of preparing the soybean protein concentrate powder, pretreating soybean protein concentrate powder emulsion, performing microwave auxiliary enzymatic treatment on the soybean protein concentrate powder emulsion, deactivating enzymatic hydrolysate, centrifuging, performing ultrafiltration treatment and performing vacuum freeze drying treatment by using the microwave auxiliary enzymatic hydrolysis technology; the enzymatic hydrolysis time is shortened to 35-38 minutes; and compared with the conventional enzymatic hydrolysis, the efficiency is increased by 3-4 times, and the ABTS (2, 2'-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid)) free radical clear rate is over 72 percent and is equivalent to that of the conventional enzyme. According to the process method, a new idea is provided for technical research for quickly preparing the soybean antioxidant peptide, and a new approach is provided for development and application of soybean series products of high antioxidant activity.

The invention belongs to the technical field of a microwave technology and an aircraft stealth technology, and discloses a dual-band wave absorption frequency selective surface system, a design methodand an aircraft. The dual-band wave absorption frequency selective surface system is provided with a dielectric support plate, resistant thin film square rings and a circular-groove frequency selective surface, wherein the resistant thin film square rings are periodically arranged on an upper surface of the dielectric support plate, the circular-groove frequency selective surface is arranged on alower surface of the dielectric support plate and comprises a dielectric plate and a metal layer, the metal layer is arranged on an upper surface of the dielectric plate, the thickness of the metal layer is not considered, and circular grooves are periodically formed in the metal layer. By the dual-band wave absorption frequency selective surface system, k-band wave transparent / dual-band wave absorption can be achieved, an array pattern is compact, and good stability is achieved under an oblique incidence condition; the dual-band wave absorption frequency selective surface system is simple instructure; compared with a multi-layer structure, the dual-band wave absorption frequency selective surface system is only provided with the upper-layer resistant film, the intermediate-layer dielectric support plate and the lower-layer frequency selective surface, and is lighter and is lower in profile; and a transition band between the wave transparent band and the wave absorption band is small, and the wave absorption effect is good.

The invention discloses a method for realizing photonic frequency conversion and multi-channel phase shift of a microwave signal by using a dual-polarization quadrature phase shift keying (DP-QPSK) modulator, relates to the technical field of microwaves and the technical field of optical communication, and can be mainly applied to beam forming, IQ demodulation and the like of the signal. As shownin an attached drawing, the scheme comprises a light source, a local oscillation source, an erbium-doped optical fiber amplifier, an optical splitter, a polarization controller, a polarizer and a photoelectric detector. According to the invention, the DP-QPSK modulator is used for carrying out modulation and polarization multiplexing on a radio frequency signal and a microwave local oscillator, after light amplification, power is divided into multiple paths, each path controls the amplitude and phase of an output signal through the polarization controller and the polarizer, and finally a phase-changed intermediate frequency signal is obtained through the photoelectric detector. According to the invention, the up-down frequency conversion and phase shift functions of signals can be realizedat the same time, the influence caused by periodic power fading is avoided, the system gain is large, and the system has the characteristics of simple structure, flexible tuning, large bandwidth, multiple functions and the like.

The present invention relates to a microwave source of the high-power microwave technology field, and provides a relativistic backward-wave oscillator with a collector shaped as a Chinese character chang. The relativistic backward-wave oscillator comprises a cathode base, a cathode, an anode outer cylinder, a cut-off neck, a slow wave structure, a tapered waveguide, a reflector, an output waveguide and a solenoidal magnetic field. The collector shaped as the Chinese character chang is arranged behind the tapered waveguide, a stepped reflection cavity is arranged between the cut-off neck and the slow wave structure, and double extraction cavities are also arranged between the tail end of the slow wave structure and the tapered waveguide. The relativistic backward-wave oscillator of the present invention overcomes the disadvantage that the conventional relativistic backward-wave oscillator is difficult to consider the long output microwave pulse width and the high power conversion efficiency simultaneously, solves the problem that a coaxial extraction structure is easy to generate the plasmas to thereby influence the working efficiency, and realizes the microwave output that the pulse width is greater than 100 ns, the efficiency is greater than 40%, and the power is 6 GW, on the condition of using less slow wave blades. Moreover, a high-power microwave source is compact in structure, and is easy for the repeated frequency operation.

The invention discloses a method for self-coherence detection of an optical carrier radio frequency link based on polarization multiplexing. The invention relates to the technical field of optical communication and microwaves. The method is shown in the attached drawing, and comprises a laser source, a vector signal source, a polarization controller, a polarization beam splitter, a polarization multiplexing Mach-Zehnder modulator, a single-mode fiber, an erbium-doped fiber amplifier, a 90-degree optical coupler and a balance photoelectric detector. According to the method, two paths of different radio frequency electric signals are used for respectively carrying out intensity modulation and phase modulation on two optical carriers with orthogonal polarization states in a polarization multiplexing Mach-Zehnder modulator; frequency mixing is carried out through a 90-degree optical coupler; signal processing is performed on the electric signal output by the balance photoelectric detectorto recover an original electric signal; the polarization multiplexing mode is used for improving the utilization rate of spectrum and light source power; self-coherent detection is used at the receiving end; and a local oscillation light source and a complex phase noise elimination algorithm are avoided, so that the system cost is reduced, and the requirement for the line width of the laser is lowered.

The invention discloses a Ga2O3 Schottky diode device structure and a manufacturing method thereof, and mainly aims at solving the problems that a present Schottky diode device is low in reverse breakdown voltage and the parasitic capacitance in a field plate structure is high. The Ga2O3 Schottky diode device structure comprises a cathode electrode, a heavily-doped n type Ga2O3 substrate, a low-doped n type Ga2O3 epitaxial layer and an anode electrode from bottom to top; Schottky contact is formed in the part where the anode makes contact with the epitaxial layer, the cathode and the substrate make ohmic contact, grooves are distributed separately in the low-doped n type Ga2O3 epitaxial layer, intervals of grooves are increased progressively within the range of 0.3 to 0.5 micron, the first groove is positioned below the edge of the anode, the distance between the last groove and the first groove ranges from 10 to 15 micron, and AlGaO layers in which the Al component is greater than 20% are grown in an epitaxial manner in the grooves respectively. Thus, the reverse breakdown voltage is improved, the parasitic capacitance is reduced, positive characteristic is kept unchanged, and the structure and manufacturing method thereof can be used for high-speed integration circuits and microwave technologies.

The invention discloses a desorption and regeneration method for an organic matter adsorbent. The method is characterized in that an organic matter adsorbent desorption and regeneration device of a microwave generator is arranged in a desorption tower; the to-be-desorbed adsorbent with organic matters is put in the desorption tower; steam is aerated from the top of the desorption tower; the microwave generator is started, wherein the microwave power is 500-10000W; desorption is carried out for 2-30 minutes; the desorbed organic matters and steam flow out from a steam outlet at the bottom of the desorption tower and enter a condenser for condensation; then the steam is cut off, nitrogen is aerated from the top of the desorption tower, and the nitrogen flows out from the bottom, wherein the microwave power is 200-2000W; drying treatment is carried out for 2-20 minutes; the microwave generator is turned off, and the nitrogen is cut off; the desorbed adsorbent is obtained. According to the method, the desorption rate is improved by a large margin by combining steam and the microwave technology, and less desorption residue is left.

The invention relates to an application of a microwave technology in processing oil-tea camellia seeds. The microwave technology comprises the following technological steps: firstly, crushing oil-tea camellia seeds by a wet method, afterwards adopting microwaves to extract tea saponin, then adopting microwave puffing to process the residues of the oil-tea camellia seeds, and finally, carrying outsubsequent processing on the residues of the oil-tea camellia seeds. The invention directly takes the oil-tea camellia seeds as raw materials, can obtain the tea saponin with high quality, removes the tea saponin from the tea seeds firstly, is beneficial to the subsequent extraction of tea seed oil, can obtain tea oil which is nearly colorless, and can omit a decoloration procedure for refining the tea oil; the microwave extraction of the tea saponin has the advantages of high selectivity, short time consumption, little solvent consumption and high extraction rate in one time; and the microwave puffing preprocessing of the raw materials of oil-tea camellia seed kernels is beneficial to enhancing the oil yield of the subsequent preparation of the tea seed oil.

A tar sand volatilizer system thermally removes petroleum crude oil from tar sands or shale oil. A series of heated augers or thermal screws are used to elevate material temperature gradually using conductive heat transfer. The thermal screws blades and auger case receive a heated fluid. The screws are driven by variable speed drive systems. The unit is sized for any throughput rate desired. Hot clean material discharges into a rotary cooler and re-hydrator unit. The exhaust gases are pulled through a high temperature filter collector for particulate removal. The particulate free petroleum vapor laden hot gas exits the filter house into a multi stage condenser system with water chillers where the vapor temperature is gradually cooled. A microwave upgrader system processes crude oil using catalyst injected microwave technology to produce a diesel like fuel oil in a continuous process stream.

The invention provides a production technology of a blood lipid reducing lotus leaf tea, pertaining to the tea processing technical field. Fresh lotus leaves are cut into squares with a side length of 4cm, laid open on a conveyer belt of a 6CW-10E type tea microwave de-enzyming and drying device for being treated with de-enzyming of the lotus leaves, laid for cooling for 20min, put into a 6CR-30 type tea roller for rolling for 20-40min based on a principle of 'light-heavy-light', then the lotus leaves are laid open on the conveyer belt evenly for drying and cooling, crushed through 40 meshes and packaged into tea bags. The production process of the lotus tea provided by the invention adopts microwave technology for de-enzyming and drying the lotus leaves, which greatly shortens the production time of the lotus leaf tea, improves the production efficiency and enhances preservation of flavone substances in the lotus leaves. Water soluble lotus leaf flavone contained in the tea soup of the lotus leaf tea is not less than 0.23mg / g, thereby being capable of reducing serum triglyceride and total cholesterol remarkably and having auxiliary function for reducing blood lipid.

The present invention describes extremely rapid and efficient methods for the attachment of chemical moieties to matrices by the use of microwave technology. The methods of the invention can be applied in a variety of ways for the preparation of different types of matrices for a variety of applications including but not limited to the functionalization of various solid supports, and matrices in the form of powder, beads, sheets, and other suitable surfaces for use in applications including but not limited to oligonucleotide synthesis, peptide synthesis, environmental clean up (removal of toxic materials), immunoassays, affinity chromatography, combinatorial chemistry, microarrays, proteomics and medical diagnostics.

The invention relates to a high-gain planar wide-frequency antenna which relates to a microwave technology and comprises an Archimedean spiral antenna radiation sheet, a tapered balun and a shell, wherein a reflection cavity is arranged in the shell, and the Archimedean spiral antenna radiation sheet is connected with a signal source accessing end through the tapered balun. The invention has the advantages that the gain of a wide-frequency spiral antenna is improved to a great degree, the circular polarization characteristic of far-field radiation is good, and meanwhile, the standing wave of the whole antenna system also has better performance. The invention has high gain, stable gain, lower axial ratio and wide application potential in the aspects of military affairs and civil use.

The present invention discloses a system and method for free-space method dielectric constant measurement through addition of a polarization grid, belonging to the electromagnetic field and microwave technology field. On the basis of the current free-space method measurement system, a polarization grid mesh is added next to one side of a sample to be measured, a changing curve of reflection parameters and transmission parameters of the network with the angle of the polarization grid mesh is measured to distinguish the electromagnetic wave penetrating into the electromagnetic wave of the grid mesh from the invariable electromagnetic waves of other paths; and the changing signals carry the dielectric information of the sample to be measured, and the coefficients such as the amplitude in the changing curve are employed to perform evolution of the dielectric constant of the sample to be measured. In a stable environment, the changing of the network parameters with the polarization grid angle is not sensitive to the electromagnetic environment, and therefore the influences of the electromagnetic wave diffraction and diffraction in the experiment environment is effectively reduced. Besides, focusing lens antennas employ lossy material polylactic acid (PLA) to effectively reduce the multiple reflection of electromagnetic wave between the antennas to allow an experiment result to be more accurate.

The invention provides a low permeability coal seam electricity explosion vibration and microwave assisting liquid nitrogen freeze-thawing permeability increasing device. The low permeability coal seam electricity explosion vibration and microwave assisting liquid nitrogen freeze-thawing permeability increasing device comprises a pulse discharging reactor, a cable, a high voltage pulse generator,a fracturing pipe, a mining pipe, a high pressure rubber pipe, a microwave transmitter, a coaxial waveguide, a microwave converter, a microwave generator, a first hole packer, a second hole packer, anitrogen inflating pipe, a water box, a high pressure water pump, a liquid nitrogen pump and a liquid nitrogen tank. The invention further discloses a low permeability coal seam electricity explosionvibration and microwave assisting liquid nitrogen freeze-thawing permeability increasing method. A hydraulic fracturing technology, an electricity explosion vibration technology, a liquid nitrogen freeze-thawing technology and a microwave technology are harmoniously integrated, the permeability and the porosity of a coal seam are increased to a great extent, coal seam fractures can be increased, the liquid nitrogen freeze-thawing efficiency is improved, circular work is conducted, ice in the fractures is easily molten, the permeability of a low-permeability coal seam is greatly improved, the effect of mining and exhausting methane gas is improved, expected time needed for mining the methane gas is shortened by a large margin, and a superior premise is provided for mining the methane gas ofa mine.

The invention belongs to the technical field of food and provides a fresh-keeping technology of cleaning, crispy-keeping, alkaline solution and microwave enzyme inactivation, and vacuum packing of leafy vegetables. The technology has the characteristics that the microwave technology is adopted; the enzyme inactivation effect is good; the inactivation rate of peroxydase can reach 96.8%; the physical appearances of vegetables are better preserved; and the loss of nutrient substances like vitamin c is less. The technology has the advantages that the detect is overcome that when the leafy vegetables are blanched by conventional hot water for a short time, the enzyme inhibition rate is low; the defect is overcome that when the leafy vegetables are blanched by hot water for a long time, the vegetables soften and turn yellow, and the loss of the nutrient elements of vegetables is great; and the alkaline solution and microwave blanching is adopted, so that the thorough inactivation of chlorophyllase is realized, green preserving process can be simplified, and the problem that heavy mental is left over in green preserving liquid is solved.

The invention discloses a device and a method for realizing instantaneous frequency measurement using a lithium niobate phase modulator. The device and the method relate to the technical field of microwave and the technical field of optical communication, and are mainly applied to the field of electronic reconnaissance. The device comprises a laser, a polarization controller, a phase modulator, a standard single-mode optical fiber, an optical divider, a polarizer and an optical receiver, as shown in the appended drawings. By using the polarization sensitive property of the lithium niobate phase modulator and reasonably adjusting the polarization controller, phase modulation and intensity modulation can be realized at the same time. Based on the dispersion characteristic of the optical fiber, two frequency response functions opposite in change trend can be constructed. Thus, an amplitude comparison function obtained changes more quickly in a large band. By calculating the power ratio of upper and lower branches, the frequency of a to-be-measured microwave signal can be estimated. The measurement error of the device within the range from 1.6GHz to 24.6GHz is less than + / -0.3GHz.