60 results about "Microwave phase shifter" patented technology

The invention discloses a stable photoelectric oscillator. The stable photoelectric oscillator comprises a laser device, an electro-optical modulator, a long optical fiber, a photoelectric detector, an amplifier, an electric band-pass filter, an electrically-controlled microwave phase shifter, a high-stability microwave source, a 2*1 wave combiner or directional coupler, a first 1*2 power divider or directional coupler, a second 1*2 power divider or directional coupler, a third 1*2 power divider or directional coupler and a phase locking control module, wherein the phase locking control module comprises a frequency mixer, an electric low pass filter and a servo control module, the output end of the frequency mixer is connected to the input end of the electric low pass filter, and the output end of the electric low pass filter is connected to the input end of the servo control module. According to the stable photoelectric oscillator, an electric injection of the external high-stability microwave source and a phase locking control mechanism are added based on a traditional single-loop OEO structure. Compared with the prior art, the stable photoelectric oscillator has the advantages that insertion loss of an optical link in a resonant cavity is not increased, the high signal to noise ratio of the photoelectric resonant cavity is maintained, and the structural complexity of the stable photoelectric oscillator is lower than that of an existing scheme. The stable photoelectric oscillator is easy to obtain.

The invention discloses a microwave signal optical fiber stationary phase transmission system based on a microwave phase shifter. The system comprises a central station, a far end and a single-mode optical fiber. The central station is connected with the far end through the single-mode optical fiber. The central station is composed of a semiconductor laser device, a dual-drive Mach-Zehnder modulator, a microwave signal source, a first power divider, a first optical filter, an erbium-doped optical fiber amplifier, an optical coupler, a first array waveguide grating, a first photoelectric detector, a frequency eliminator, a second power divider, an optical source, a strength modulator, a second optical filter, an optical circulator, a second photoelectric detector, a first electric mixer, a band-pass filter, a second electric mixer, a low-pass filter and a linear voltage amplification circuit. The far end is composed of a second array waveguide grating, a third photoelectric detector and a Faraday polariscope. According to the invention, the advantage of low building and maintenance cost can be realized; and the phase jitter of microwave signals can be extracted and fed back on a real-time basis.

The invention discloses a microwave source phase noise test method and device based on a microwave photon mixing technology. The device comprises a microwave source, a microwave power divider, a microwave phase shifter, a laser source, a first electro-optical modulator, an optical fiber, a second electro-optical modulator, an optical band pass filter, a photoelectric detector, an electric low pass filter and an FFT analyzer, wherein the laser source, the first electro-optical modulator, the optical fiber, the second electro-optical modulator, the optical band pass filter, the photoelectric detector, the electric low pass filter and the FFT analyzer are sequentially connected in the optical path direction. According to the method, a microwave signal to be tested generated by the microwave source is divided into two paths through the microwave power divider, one path of the signal is modulated through the first electro-optical modulator to generate an initial modulated optical signal, the other path of the signal enters the second electro-optical modulator after passing through the microwave phase shifter and conducts modulation on the initial modulated optical signal generated after the optical fiber is delayed, and the finally obtained modulated optical signal passes through the optical band pass filter, the photoelectric detector and the electric low pass filter sequentially; the signals output by the electric low pass filter are collected by the FFT analyzer, and the phase noise of the microwave signal to be tested is obtained through computing. The method and device have the advantages of being wide in operation bandwidth, high in test sensitivity, free of changing along with the frequency and the like.

The invention discloses a laser wavelength adjustment-based opto-electronic oscillator with a tunable frequency and a tunable broadband. The opto-electronic oscillator is characterized in that: a wavelength tunable laser, a polarization controller, a double-arm Mach-Zehnder modulator, a narrowband phase-shifted fiber grating and a high speed photoelectric detector are connected in order by fibers; and radio frequency input ports of the high speed photoelectric detector, a microwave high pass filter, a microwave amplifier, a microwave phase shifter, a microwave coupler, a microwave 3dB quadrature coupler and the double-arm Mach-Zehnder modulator are connected in order by microwave coaxial lines. Besides, a closed opto-electronic oscillation loop is formed by the double-arm Mach-Zehnder modulator, the narrowband phase-shifted fiber grating, the high speed photoelectric detector, the microwave high pass filter, the microwave amplifier, the microwave phase shifter, the microwave coupler, and the microwave 3dB quadrature coupler; and a high quality microwave signal with a tunable frequency and a tunable broadband is generated at another output port of the microwave coupler by adjustinga wavelength of the wavelength tunable laser. According to the invention, the opto-electronic oscillator has advantages of compact structure, fast frequency adjusting speed, and wide tunable frequency domain and the like.

The invention relates to the technical field of communication devices, in particular to a high-power microwave phase shifter which comprises a rectangular waveguide, a circular waveguide placed on an E face of the rectangular waveguide, and mode-converting and circular polarization units placed on other faces of the rectangular waveguide. A short-circuiting piston which can move in the direction of the axis of the circular waveguide is arranged in the circular waveguide. The mode-converting and circular polarization units are used for converting TE10 mode microwaves into two orthogonal-polarization TE11 mode microwaves which are the same in amplitude and have 90-degree phase difference, and the mode microwaves are input to the circular waveguide. Due to the fact that the high-power microwave phase shifter can achieve phase shifting without ferrite materials, the size and loss of the phase shifter can be lowered, and meanwhile the whole high-power microwave phase shifter can be made of metal materials, and accordingly high-power capacity can be achieved.

Disclosed is an adjustable-energy electron accelerator. Its electron accelerating pipe comprises the traveling wave accelerating section [6], the second travelling wave or standing wave accelerating section [5] and the microwave binding-flow hole [7]. The traveling wave accelerating section [6] is ahead, which follow the Standing wave accelerating section [5], the microwave power first feed in the traveling wave accelerating section [6], and is connected with the entry of the standing wave accelerating section [5]. The electron beam firstly enter the micro binding-flow hole via the traveling wave accelerating section, then enter the second traveling wave or standing wave accelerating section [5]. The present invention can decelerate the electron beam in the accelerating structure.

The invention discloses an active passive hybrid microwave phase shifter, relates to a phase shifting chip, and belongs to the technical field of basic electronic circuits. The active passive hybrid microwave phase shifter comprises a passive phase shifting part, an active phase shifting part and a digital control part; the active phase shifting part and the passive phase shifting part perform large displacement phase and small displacement phase under the control of the digital control part, which can avoid the defects of an existing passive structure and an active structure, and can flexiblyallocate phase shifts according to the demand; and in addition, the layout is flexible, the control signal is simple, the chip integration level is high, and the active passive hybrid microwave phaseshifter can be widely applied to a microwave millimeter wave phased array chip and has a good application prospect.

A phase shifter according to this invention includes a circuit board having a semi-insulating layer. An active layer is formed in a transmission line forming portion on one surface side of the semi-insulating layer, a first ground conductive layer is formed on the other surface side, a transmission line is formed on the upper side of the active layer, and a second ground conductive layer is formed on the transmission line forming surface of the semi-insulating layer in close proximity to one side of the transmission line. If a bias voltage of negative polarity is applied to the transmission line, reverse bias is applied to the active layer to form a depletion layer and capacitance is equivalently connected to the transmission line having inductance. A phase shift amount can be freely controlled by changing the value of the capacitance according to the bias voltage.

The invention relates to plane left-hand microstrip transmission line structure based microwave phrase shifter, solving the problems of big volume, large consumption, small power capacity, etc. of the prior microwave phrase shifter. The microwave phrase shifter of the invention is formed by arranging PIN switches on a left-hand microstrip transmission line unit. The details of the proposal are that: a pair of PIN switches is arranged on a selected pair of side strips or of interdigital strips arranged on corresponding positions; a signal input port and a signal output port are respectively positioned on the pair of side strips. As a result, only a small part of the current passing through the whole phrase shifter passes through the PIN switches arranged on a single interdigital strip or on the side strips, thereby power capacity of the phase shifter is improved greatly; in addition to the high power capacity, the phrase shifter has various advantages such as small consumption, small volume, fast shifting speed, convenient manufacture, capacity for easy integration with an MMIC circuit. The invention has great advantage in terms of application in radar and phrased antenna array.

The invention discloses a composite powder body by utilizing alumina for coating barium strontium titanate and a peparation method thereof. The preparation method comprises the following steps: utilizing Ba[1-x]Sr[x]TiO3 and AlCl3 as precursor materials; utilizing de-ionized water as a solvent; utilizing ammonia water for adjusting the pH value of a solution; utilizing PMAA-NH4 as a dispersant; adopting a liquid-coating method for preparing a Ba[1-x]Sr[x]TiO3 composite powder body coated by the Al2O3; and coating the Al2O3 on the surface of the Ba[1-x]Sr[x]TiO3 particles. Compared with traditional mixed method, the method can prevent the growth of the Ba[1-x]Sr[x]TiO3 particles when sintering, control the granularity of Ba[1-x]Sr[x]TiO3 crystal grains in a sintering body in a smaller range, thereby optimizing the dielectric property of the sintering body. The invention can be widely used for manufacturing electronic devices and components of phased-array antennas, microwave transmission lines, microwave phasers, adjustable capacitors, and the like.

The invention discloses a phase shifter. The phase shifter is a novel circuit structure which realizes a phase shifting function by adopting a composite right and left handed transmission line unit structure. The phase shifter comprises an input stage amplifier, one or multiple composite right and left handed transmission line unit structures, and an output stage amplifier. The input stage amplifier matches an impedance at an input end with an impedance of each composite right and left handed transmission line unit structure and amplifies an signal; each right and left handed transmission line unit structure plays a role of signal phase shifting; and the output stage amplifier matches the impedance at the output end with the impedance of each composite right and left handed transmission line unit structure and amplifies the signal.

The invention discloses a spatial directional angle measuring system based on all-optical cross polarization modulation. The spatial directional angle measuring system comprises a first mach-zehnder intensity modulator, a polarization controller, a second mach-zehnder intensity modulator, a polarization controller I, an electric coupler, a microwave phase shifter, a polarization controller II, an optical fiber online polarizer, an optical band pass filter, a photoelectric detector, an offset T and a voltmeter, wherein the first mach-zehnder intensity modulator and the polarization controller are connected with a first laser light source; the second mach-zehnder intensity modulator and the polarization controller I are connected with a second laser light source; the electric coupler and the microwave phase shifter are connected with a microwave signal source; the polarization controller III, the optical fiber online polarizer, the optical band pass filter, the photoelectric detector, the offset T and the voltmeter are sequentially connected with the optical coupler. The spatial directional angle measuring system based on all-optical cross polarization modulation can be used for solving the problem of difficulty in quickly identifying antenna signal directional position information in an optically controlled phased array radar, and can be used for realizing primary measurement of an antenna spatial directional angle based on an all-optical cross polarization modulation method.

The invention relates to a microwave phase shifter, in particular to a substrate integrated waveguide (SIW) phase shifter based on different filled dielectric constant materials, which comprises a branch circuit 1 and a branch circuit 2, wherein the branch circuit 1 is corresponding to a reference zero phase, the branch circuit 2 is corresponding to degrees needed to shift phases, the air is used as a propagation medium in the branch circuit 1, a SIW body medium material in the branch circuit 2 is used as a propagation medium, the phase positions of substrate integrated waveguides can be changed through the lengths of microstrip lines and the length and the width of SIW, phase shifting amounts produced by the measures can be compensated with each other, and a fixed phase difference is formed in a wideband frequency range by adjusting physical size parameters and filling materials. The SIW phase shifter based on the different filled dielectric constant materials respectively achieves 71.8% (7.55-16GHz, 45 degrees+_3 degrees) and 77.2% (7.35-16.6GHz, 90 degrees+_5.1degrees) of practical bandwidths of 45 degrees and 90 degrees phase shifts, has excellent amplitude consistency, is better than 2dB in insertion loss, and can be conveniently integrated with other plane-type passive and active circuits.

A phased array antenna including at least one configurable phase shifter. The configurable phase shifter includes a U-shaped primary waveguide section and multiple switchable waveguide U-shaped sections disposed within the primary section. The switchable waveguide sections include a plunger in the U-shaped waveguide section and one or more solenoids attached to the plunger, driving the plunger in and out such that the switches can be actuated in less than 100 milliseconds. The plunger and the switchable waveguide section are shaped such that the waveguide height is constant in the U-shaped waveguide section when the switch is closed and constant in the primary waveguide section when the switch is open, thereby minimizing return loss. The U-shaped primary waveguide section includes an input port and an output port at opposite sides. A radiating slot is located at the bottom face of the U-shaped primary waveguide section. The radiating slot may be formed in a detachable plate attached to the bottom the U-shaped primary waveguide section. Further, multiple one configurable phase shifters may be cascaded to form a traveling wave phased array antenna.

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 relates to a photoelectric oscillator with a microwave amplitude limiter. The photoelectric oscillator comprises a light source and a photoelectric loop, and the photoelectric loop comprises a light modulator, a long fiber, a light detector, a microwave amplifier, the microwave amplitude limiter, a microwave coupler, a microwave bandpass filter and a microwave phase shifter. Compared with a routine photoelectric oscillator, the microwave amplitude limiter is used in the photoelectric loop for the first time. The photoelectric loop is a nonlinear device, and limits the amplitude of output microwave signals, so that the microwave amplifier works in a linear area, and phase-noise deterioration of output signals of the oscillator caused by that the microwave amplifier works in a saturation area can be avoided. Compared with the routine photoelectric oscillator which does not include the microwave amplitude limiter and whose microwave amplifier works in the saturation area, the photoelectric oscillator with the microwave amplitude limiter can solve the problem of phase-noise deterioration caused by saturation of the microwave amplifier, outputs oscillation signals of lower phase noise, and is simple in structure and easy to realize.

The invention provides an optical generation method and system for a radio frequency arbitrary waveform based on a digital logic operation, belonging to the field of arbitrary waveform generation. Thesystem comprises n optical power modulation units, a wavelength division multiplexer or an optical coupler, a photodetector and a filter, wherein each optical power modulation unit comprises a laser,a modulator, two microwave phase shifters and a digital signal generator. The method comprises the following steps: generating n pairs of digital signals according to an expression of a target radiofrequency analog signal waveform and a logic operation relationship realized by the modulator, correspondingly generating non-return-to-zero code microwave digital signals by using the digital signalgenerator, inputting each pair of non-return-to-zero code microwave digital signals to the modulator to perform intensity modulation on a path of laser, obtaining n paths of optical signals, and thencoupling the n paths of optical signals into one path of optical signal, converting the optical signal into an electric signal, and finally obtaining the target radio frequency analog signal waveformthrough the filter. According to the scheme of the invention, the range resolution of radars, satellite detection systems and other systems can be effectively improved, and high-precision imaging canbe realized.

The invention discloses a high-dielectric tunability ceramic/high polymer functional composite and a preparation method.Barium strontium titanate ceramic particles are dispersed into a polyvinylidene fluoride matrix, and the barium strontium titanate ceramic particles and polyvinylidene fluoride are bonded with gamma-aminopropyltriethoxysilane.According to the composition of the dielectric functional composite and the preparation method, the dielectric constant ranges from 40 to 56, high dielectric tunability and workability are achieved, and the requirement of devices in the field of communication equipment including microwave phase shifters, phased-array antennas, tunable capacitors and the like for high dielectric tunability can be met.The dielectric functional composite has the advantages of dielectric constant serialization, high dielectric tunability, low dielectric loss and high energy storage density and is good in processability, components of complex structures can be easily manufactured, and the cost of practical application is reduced.

The invention discloses a difluoroethylene benzene liquid crystal compound, a liquid crystal composition and application thereof. The structure of the liquid crystal compound is as shown in a formulaI which is shown in the description, wherein n is an integer ranging from 1 to 8, and X1 and X2 are respectively and independently selected from H atoms, F atoms or Cl atoms. The liquid crystal composition is a nematic-phase liquid crystal material which meets the requirements of a microwave device and which is high in dielectric, low in loss and stable in low temperature performance, and the liquid crystal composition is capable of reducing dielectric loss of the microwave device, can be used as a liquid crystal material for a microwave phase shifter assembly and is suitable for the microwavephase shifter assembly.

The invention discloses a microwave phase shifter based on a micro-mechano-electronic technology. The microwave phase shifter comprises a distribution parameter transmission line (1), capacitor drivers (3) and a dielectric substrate (2). The capacitor drivers (3) are arranged on the dielectric substrate (2). One end of each capacitor driver (3) is connected with a corresponding grounding wire of the distribution parameter transmission line (1) through a U-shaped beam (9), the other end of each capacitor driver (3) is connected with a driving power supply, interdigital capacitors (8) are evenly loaded between a signal wire (7) and the grounding wires, and therefore the distribution parameter transmission line (1) is formed. The microwave phase shifter has the advantages that electrostatic force is generated through the interdigital capacitors, the grounding wires of the distribution parameter transmission line shift, the capacitance of the interdigital capacitors changes correspondingly, the phase of a signal also changes, the phase is changed continuously and an infinite number of phase states are realized when driving voltage continuously changes, and the microwave phase shifter is simple in structure and convenient to control.

The invention discloses a phased-array antenna intra-pulse multi-beam implementation method, and the method comprises the following steps that a computer sends a control instruction according to a preset time sequence, and the sending is completed during a pulse cut-off period; after the T/R module receives the control instruction, control data of the control instruction is found out by using a table look-up method during a pulse cut-off period, all the control data are assigned to ten data latches of each channel of the beam control circuit in advance, and after assignment is completed, the assignment circuit is in a high-resistance state; pulse signals are added to the control ends of the ten data latches, and when a pulse arrives, data in the ten data latches are sequentially output under the control of the pulse, and the phase of the microwave phase shifter is controlled. Therefore, according to the method for realizing the multiple beams in the pulse of the phased-array antenna, the data transmission quantity of beam control is reduced, the data is written in by looking up the table, the speed is improved, and the control of the multiple beams in the pulse is realized.

The invention discloses a regeneratively mode-locked fiber laser based on a two-dimensional material photoelectric device. The laser comprises an erbium-doped optical fiber amplifier (1), a polarization controller (2), an electro-optical modulator (3), an optical fiber circulator (4), the two-dimensional material photoelectric device (5), a narrowband microwave filter (6), a narrowband microwave amplifier (7), a microwave phase shifter (8), a tunable optical fiber delay line (9) and a 20: 80 optical fiber coupler (10), wherein the two-dimensional material photoelectric device (5) is formed by a source electrode (51), a drain electrode (52), a two-dimensional tungsten disulfide nanosheet (53), a two-dimensional black phosphorus nanosheet (54), a reflector (55) and a silicon oxide substrate (56); the two-dimensional material photoelectric device (5) has two functions in order to be both taken as a photoelectric detector and a saturable absorber.

The invention discloses a measuring device and method of modal birefringence for high-birefringence polarization-maintaining fibers. The measuring device comprises a wide-spectrum light source, a polarizer, an electrooptical modulator, a high-birefringence polarization-maintaining fiber under measurement, a polarization analyzer, a photoelectric detector, a frequency mixer, a data acquisition circuit and a computer, as well as a frequency sweep signal source, a microwave power divider, and a microwave phase shifter. The electrooptical modulator modulates a first microwave signal to light to form a light-carried microwave signal; the light-carried microwave signal passes through the high-birefringence polarization-maintaining fiber under measurement to form two light-carried microwave signals having different optical path differences; the two light-carried microwave signals having different optical path differences pass through a photoelectric detector and are input to the radio frequency input end of the frequency mixer; the frequency mixer performs frequency mixing on the two light-carried microwave signals having different optical path differences and the second microwave signal,a medium-frequency signal passes through a low-pass filter, and a direct-current signal is input to the data acquisition circuit; the data acquisition circuit inputs frequencies at the different amplitude parts of the direct-current signal to the computer for computing. The measuring device and method herein provide precise measurement for the modal birefringence of high-birefringence polarization-maintaining fibers.

An optic-microwave frequency discriminator includes: a fiber coupler receives and combines a first laser and a second laser, than the fiber coupler respectively generates and outputs a first light signal and a second light signal; a photodiode module respectively receives the first light signal and the second light signal, and converts the first light signal into a first microwave signal and converts the second light signal into a second microwave signal; a microwave phase shifter generates a shifted microwave signal by introducing a phase shift to the second microwave signal; a 90° microwave bridge combines the first microwave signal and the shifted microwave signal for generating a first bridge signal and a second bridge signal; a normalized balanced detection module generates an error signal; and a control module generates a controlling voltage signal according to the error signal for tuning a frequency of the second laser.

The invention relates to a microwave phase shifter which is mainly used to solve the technical problem of low phase shift precision and small phase shift in the prior art. The microwave phase shifter comprises a narrow-linewidth distributed feedback laser which is used for outputting polarized light; a polarization-maintaining fiber coupler, an intensity optical modulator, a single-mode fiber coupler and a magneto-optical switch which are connected with the narrow-linewidth distributed feedback laser in sequence; an electric fiber delay line and an electric control piezoelectric ceramic fiber delay line which are connected in parallel with the magneto-optical switch; a single-mode fiber coupler which is connected with the electric fiber delay line and the electric control piezoelectric ceramic fiber delay line; a high-speed photoelectric detector which is connected with the single-mode fiber coupler; and an intensity optical modulator control unit and a radio-frequency signal input port which are connected with the intensity optical modulator. Through the technical scheme, the technical problem is well solved. The technical scheme can be used in industrial production of the microwave phase shifter.

The invention relates to a method of making a microwave phase shifter, which is provided mainly to solve the technical problem of low phase shift precision and small phase shift in the prior art. A microwave phase shifter based on an optical-electrical mutual conversion device comprises a narrow-linewidth distributed feedback laser which is used for outputting polarized light; a polarization-maintaining fiber coupler, an intensity optical modulator, a single-mode fiber coupler and a magneto-optical switch which are connected with the narrow-linewidth distributed feedback laser in sequence; an electric fiber delay line and an electric control piezoelectric ceramic fiber delay line which are connected in parallel with the magneto-optical switch; a single-mode fiber coupler which is connected with the electric fiber delay line and the electric control piezoelectric ceramic fiber delay line; a high-speed photoelectric detector which is connected with the single-mode fiber coupler; and an intensity optical modulator control unit and a radio-frequency signal input port which are connected with the intensity optical modulator. Through the technical scheme, the technical problem is well solved. The technical scheme can be used in industrial production of the microwave phase shifter.