124results about How to "Improve working bandwidth" patented technology

The broadband dual-polarization magnetoelectric dipole antenna comprises a first dielectric layer and a second dielectric layer arranged below the first dielectric layer, and the first dielectric layer and the second dielectric layer are connected through a bonding layer to serve as an antenna substrate for supporting a magnetoelectric dipole unit. The magnetoelectric dipole unit comprises metal patches and magnetic dipoles, the metal patches and the magnetic dipoles are used as electric dipoles and magnetic dipoles, the magnetic dipoles penetrate through the first dielectric layer and are arranged on the lower side of the second dielectric layer, and the four metal patches are annularly and uniformly arranged on the upper side face of the first dielectric layer; the shape of the metal patch is a rectangle with semi-elliptical chamfers on two side edges of the outer edge; any metal patch is coupled with two gain patches arranged on the first dielectric layer, and the gain patches are circular. The problem that in the prior art, a magnetoelectric dipole antenna is poor in impedance bandwidth capacity, and therefore the requirement of people for the network information transmission speed cannot be met is solved.

The invention relates to the technical field of sensors, and discloses an inductive displacement sensor, which comprises a substrate, two pairs of rectangular receiving coils fixedly arranged on the surface of the substrate and a vortex linear exciting coil, an initial plane coordinate system is created by taking the center of the substrate as an original point, and the two receiving coils in each pair are arranged in parallel; the excitation coil is located on the side, away from the substrate, of the receiving coil and is parallel to the surface of the substrate. In the initial state, when the projection of the center point of the exciting coil on the substrate coincides with the original point of the initial plane coordinate system and the receiving coil has displacement in the xy plane relative to the exciting coil, the two pairs of coils output relative displacement in the x direction and the y direction respectively, and decoupling of the relative displacement in the two directions is achieved at the same time. Displacement measurement in two directions can be carried out at the same time, high-precision and high-stability measurement of displacement signals is achieved, the good dynamic response characteristic is achieved, and errors caused by movement of mechanical parts are reduced.

The present invention provides an ultra-wideband amplitude-phase independent reconfigurable metasurface based on single PIN tube regulation, which is composed of metasurface units (hereinafter referred to as "units") using only one PIN diode. A PIN diode is integrated into the microstrip transmission circuit on the back of the unit, so that the unit has the ultra-wideband amplitude-phase independent adjustable characteristics. Continuous control of the reflection amplitude and 1-bit control of the reflection phase can be achieved by continuously changing the voltage across the PIN diode. Different amplitude and phase controls are performed on the units in the reflection array to achieve functions such as low scattering, beam deflection, beam focusing, and target simulation. The present invention has the advantages of ultra-large bandwidth, independent and adjustable electromagnetic reflection amplitude and phase, low profile, low manufacturing cost, and easy system integration, and has important application prospects in the field of radar electromagnetic target characteristic simulation.

The invention relates to an analog active EMI filter with a double-ring structure and a noise suppression verification method. The EMI filter comprises a direct-current power supply, an LISN circuit, a voltage detection circuit, an injection circuit, an amplification circuit and a switching power supply, the direct-current power supply, the LISN circuit, the voltage detection circuit, the injection circuit and the switching power supply are sequentially connected in parallel, the injection circuit comprises a voltage injection branch and a current injection branch connected with the voltage injection branch in parallel, the voltage injection branch and the current injection branch are used for voltage injection and current injection respectively, and the amplification circuit comprises a first anti-phase amplification branch and a second anti-phase amplification branch connected with the first anti-phase amplification branch in parallel. The first anti-phase amplification branch circuit is respectively connected with the voltage detection circuit and the current injection branch circuit to form a first annular structure, and the second anti-phase amplification branch circuit is respectively connected with the voltage detection circuit and the voltage injection branch circuit to form a second annular structure. Compared with the prior art, the method has the advantages of realizing an effective noise interference suppression effect and the like.

The invention relates to the technical field of radio frequency microwaves, and provides a broadband hybrid ring coupler which comprises a substrate, and the substrate is provided with a first radio frequency component, a second radio frequency component, a fourth radio frequency component, a first inverting transformer and a third radio frequency component. The first radio frequency component, the second radio frequency component, the fourth radio frequency component, the first inverting transformer and the third radio frequency component are sequentially connected to form a ring; the first anti-phase transformer comprises a first inductor and a second inductor, one end of the first inductor is connected with one end of the fourth radio frequency component, one end of the second inductor is connected with one end of the third radio frequency component, and the other end of the first inductor is connected with the other end of the second inductor and then is grounded. Compared with a traditional hybrid ring coupler, the hybrid ring coupler has the advantages that the size of a circuit is reduced, the design difficulty is simplified, and the working bandwidth of the circuit is effectively widened.

The invention provides a cross coupling microstrip filtering oscillator antenna and an array thereof, and belongs to the field of large phased array radar systems.The cross coupling microstrip filtering oscillator antenna comprises an antenna feed port, a reflecting plate, a suspended cross coupling microstrip circuit board, a filter cover plate and metal oscillator arms, the filter cover plate is located on the upper surface of the reflecting plate, and a suspended air cavity is defined by the filter cover plate and the reflecting plate; the suspended cross-coupled microstrip circuit board is located in the suspended air cavity, an inner conductor of the antenna feed port extends into the suspended air cavity to be connected with the suspended cross-coupled microstrip circuit board, an outer conductor of the antenna feed port is connected with the reflecting plate, and the metal oscillator arm is located on the filter cover plate. One radiation arm in the metal oscillator arms is connected with the suspended cross-coupled microstrip circuit board, and the other radiation arm is grounded; the radiation characteristic is directly realized on the filter cover plate, and a wider working bandwidth is realized under the conditions that the lower sideband of the suspended broadband high-pass filter is high in suppression, the original filtering performance of the filter is not changed and the profile height is basically kept, so that the problem of interference of an auxiliary radar on a main radar is solved.

The invention provides a polarization insensitive 2 * 2 Mach-Zehnder optical switch based on a silicon nitride waveguide device. The silicon nitride waveguide layer comprises two optical input waveguides, two 2 * 2 bent waveguide type 3dB directional couplers, two symmetric Mach-Zehnder interference (MZI) arms and two optical output waveguides; two light input waveguides are respectively coupled with two input ports of a first 2 * 2 3dB directional coupler, through two paths of symmetrical MZI arms, a straight waveguide of one MZI arm is attached with a thermode to carry out optical signal phase modulation, output light of the two paths of MZI arms is input to a second 2 * 2 3dB directional coupler, so that the output light of the two paths of MZI arms is combined and interfered, and the output light of the two paths of MZI arms is output to the second 2 * 2 3dB directional coupler. And two paths of output waveguides are respectively led out. Based on the silicon nitride square waveguide and the 2 * 2 bent waveguide type 3dB directional coupler, the directional coupler has the advantages of being insensitive to polarization, large in bandwidth, low in insertion loss, high in extinction ratio and the like.

The invention discloses a broadband 1-bit reconfigurable circularly-polarized reflective array antenna based on a multi-resonant structure. The broadband 1-bit reconfigurable circularly-polarized reflective array antenna comprises a reconfigurable circularly-polarized reflective functional layer, a circularly-polarized horn antenna and an acrylic support. The reconfigurable circular polarization reflection function layer is formed by periodically arranging M * N circular polarization reflection array antenna units with the same structure according to the interval of 0.4125 lambda 0. The circularly polarized reflective array antenna unit is composed of a radiation layer and a direct current bias layer, the radiation layer comprises a circuit pattern designed based on a multi-resonant structure, a PIN diode, a radiation dielectric layer and a reflection bottom plate, and the direct current bias structure comprises a direct current bias dielectric layer and a direct current bias circuit. 1-bit regulation and control of unit reflection phases can be realized by controlling the on-off states of the four PIN diodes, a + / -60-degree beam scanning function can be realized by adjusting the state of each circularly polarized reflective array antenna unit, and the circularly polarized reflective array antenna can be applied to wireless communication and satellite communication systems.

The invention provides an ultra-wideband amplitude-phase independent reconfigurable metasurface based on single PIN tube regulation and control. The ultra-wideband amplitude-phase independent reconfigurable metasurface is formed by arranging metasurface units (hereinafter referred to as "units") with only one PIN diode. A PIN diode is integrated on a micro-strip transmission circuit on the back surface of the unit, so that the unit has the characteristic that the amplitude and phase of the ultra-wideband are independently adjustable. The continuous control of the reflection amplitude and the 1-bit (1-bit) control of the reflection phase can be realized by continuously changing the voltage at the two ends of the PIN diode. Different amplitude regulation and control and phase regulation and control are carried out on units in the reflection array, and the functions of low scattering, beam deflection, beam focusing, target simulation and the like can be achieved. The invention has the advantages of ultra-large bandwidth, independent and controllable electromagnetic reflection amplitude and phase, low profile, low manufacturing cost, easy system integration and the like, and has important application prospects in the field of radar electromagnetic target characteristic simulation.

The invention relates to the technical field of wireless communication, and discloses a low-orbit satellite communication Ku frequency band antenna, which is characterized by comprising a primary radiation patch, a secondary coupling radiation patch, a radiation aperture surface, a first broadband feed network layer, a coupling matching cavity layer, a second broadband feed network layer and a standard waveguide assembly, the working bandwidth of the antenna is improved based on a new form of combining the broadband feed network and the coupling metal cavity; the antenna can work normally in a Ku frequency band range; through the design of loading, stacking and the like, the antenna radiation layer, the coupling layer and the feed layer are located on the same plane, and the profile of the antenna is reduced; when the design is connected and integrated with other circuit systems, the overall profile of the antenna can be reduced; the antenna is compact in structure, convenient to assemble, excellent in electrical performance, high in antenna gain, wide in bandwidth, high in polarization purity, simple in structure and light in weight.

The invention discloses a terahertz Airy beam generation method based on an electric control liquid crystal cubic phase plate, and belongs to the technical field of terahertz signal modulation, and the method comprises the following steps: S1, calculating a structural electrode pattern required for manufacturing the cubic phase plate; s2, carrying out photoetching on the DMSO doped PEDOT: PSS organic thin film by using a stripping process, and manufacturing a structural electrode with a cubic phase pattern; s3, manufacturing a liquid crystal cubic phase plate required for generating Airy beams by using a method of loading a vertical electric field to drive liquid crystal through a structural electrode; and S4, generating Airy beams by using the terahertz liquid crystal cubic phase plate. According to the terahertz Airy beam generation method based on the electrically-controlled liquid crystal cubic phase plate, a manufactured terahertz Airy beam generation device is short in finished product period and low in cost, has good broadband optical anisotropy and electro-optical and magneto-optical modulation characteristics, can meet the requirements for large working bandwidth and tunable performance, and has wide application prospects. And the practical application process of the terahertz imaging technology can be accelerated.

The invention discloses a terahertz broadband on-off keying modulator with stable input impedance. According to the invention, a parallel common-base common-emitter bottom differential pair is adopted, and when the parallel common-base common-emitter bottom differential pair works in a differential mode state, a signal path formed by transistors Q6, Q5, Q7 and Q8 forms an amplification path, so that high current gain is ensured; when working in a common-mode state, signals from the common emitter transistor pairs Q5 and Q8 and signals from the common base transistor pairs Q6 and Q7 are offset, so that common-mode leakage signals are inhibited, and the'on-off 'isolation degree is further improved. The working frequency band is regulated and controlled by regulating and controlling the direct-current bias and the size of the common-base transistor to the Q6 and the Q7. According to the invention, a parallel common-base common-emitter differential pair is adopted as a double-balance differential structure OOK modulator of a bottom tail tube, so that low on / off input impedance change is realized while ultra-wideband input matching and high switch isolation are realized.

The utility model discloses a wide frequency band omnidirectional glass fiber reinforced plastic antenna for an unmanned aerial vehicle, which comprises a glass fiber tube, an end cover, a coaxial line assembly and an N-head connector, the end cover is arranged at one end of the glass fiber tube, the N-head connector is arranged at the other end of the glass fiber tube, and the coaxial line assembly is positioned in the glass fiber tube; the coaxial line assembly comprises a radio frequency coaxial cable, a copper pipe and a PCB, one end of the radio frequency coaxial cable is welded to the PCB, the other end of the radio frequency coaxial cable is installed on the N-head connector, a copper cap is arranged on the inner side wall of the copper pipe, and the copper cap is connected to the radio frequency coaxial cable in a sleeving mode; the length of the radio frequency coaxial cable is 110mm + / -1.0 mm, the length of the copper tube is 33mm, the material of the glass fiber tube is a glass fiber reinforced plastic material, and the length of the glass fiber tube is 150mm + / -1.0 mm; the wide-frequency-band omnidirectional glass fiber reinforced plastic antenna for the unmanned aerial vehicle provided by the utility model can meet the requirement of long-distance image transmission under the frequency band of 1800 MHz to 2000 MHz.

The invention discloses a multistage modulation microwave signal phase noise measurement system and method, and the system comprises a laser light source module which is used for generating an optical carrier signal; the microwave signal module is used for generating a first path of microwave signal and a second path of microwave signal which are the same; the first input end of the first-stage modulation module is connected with the output end of the laser light source module, the second input end of the first-stage modulation module is connected with the output end of the microwave signal module, and the first-stage modulation module is used for loading the first microwave signal to the optical carrier signal to generate a first-stage modulation signal; the input end of the second-stage modulation module is connected with the output end of the first-stage modulation module, and the second-stage modulation module is used for carrying out time delay, phase orthogonality and polarization state modulation on the first-stage modulation signal and loading the second-path microwave signal to the modulated first-stage modulation signal; and the input end of the signal processing module is connected with the output end of the secondary modulation module, and the signal processing module is used for processing the secondary modulation signal to obtain the phase noise of the microwave signal.

The invention provides a multi-section arc coupled high-power deep-sea giant magnetostrictive ultrasonic transducer and a design method thereof. The multi-section arc coupled high-power deep-sea giant magnetostrictive ultrasonic transducer comprises a multi-arc radiation shell, the two ends of the multi-arc radiation shell in the length direction are arc shells, and the side faces of the two ends of the multi-arc radiation shell in the width direction are multi-section arc shells. The multi-arc radiation shell is symmetrically arranged along the middle axis in the length direction and the middle axis in the width direction; the middle of the multi-section arc shell is a protruding arc-shaped part protruding outwards, and the two sides of the middle arc-shaped part are inwards-concave arc-shaped parts which are tangent to the middle arc-shaped part and concave inwards. An upper cover plate covers the upper portion of the multi-arc type radiation shell, a lower cover plate covers the lower portion of the multi-arc type radiation shell, and a driving module is installed in the multi-arc type radiation shell. According to the invention, by adopting the multi-arc shell, more effective modes can be created, so that the working bandwidth of the transducer is increased; in addition, the arc of the concave-convex structure can reduce the sensitivity of the surface stress of the transducer along with the change of water depth, so that the transducer can work in a deeper sea area.

The present invention discloses a waveguide coupling transmission structure of D band, including two coupler chips, which are connected by dielectric waveguides; each of the coupler chips includes a coupler body, a coupler feeder and a GSG pad; the coupler body includes a coupler bottom plate, a wedge-shaped waveguide top plate and a mode converter top plate; the mode converter top plate is rectangular, and the wedge-shaped waveguide top plate is a wedge-shaped plate with a gradually narrowing width from near to far; a first metal via array is arranged between the two side edges of the mode converter top plate and the coupler bottom plate, thereby forming a mode converter of the coupler body; a second metal via array is arranged between the two side edges of the wedge-shaped waveguide top plate and the coupler bottom plate, thereby forming a wedge-shaped waveguide of the coupler body. The present invention uses two couplers and dielectric waveguides to complete the design of the signal transmission structure, which increases the working bandwidth and reduces the in-band ripple within the working bandwidth.

The application belongs to the technical field of wireless communication, and specifically provides a wideband analog adaptive cancellation circuit based on digital accumulation loop iteration, which is used to solve the problem of reduced iteration depth and decreased cancellation ratio of the existing analog adaptive cancellation circuit due to the incomplete digital integral function. The application comprises an analog adaptive cancellation module and a digital enhancement module, taking the analog adaptive interference cancellation module as the main body, using the digital enhancement module (digital circuit) to process the direct current component, and realizing the accumulation function when updating the weight, i.e. completely realizing the digital integral function, which significantly increases the iteration depth of the system and improves the cancellation ratio of the system. Meanwhile, the algorithm of the digital enhancement module can be adjusted to determine the convergence condition of the system, and the convergence time is reduced under the condition of meeting the demand cancellation ratio. Furthermore, the analog phase shifter is used to change the optimal cancellation frequency of the system, increase the working bandwidth of the system, and relax the convergence condition of the system.

The embodiment of the present disclosure discloses a flexible combined multifunctional broadband metasurface antenna for synthetic aperture radar, which comprises, from inside to outside, a core metasurface antenna located at the center and a peripheral metasurface located at the periphery, and the core metasurface antenna and the peripheral metasurface are connected through a U-shaped slot plug structure, wherein the core metasurface antenna and the peripheral metasurface can be replaced according to different application scenarios. The present disclosure has the characteristics of simple and reliable modular structure and flexible configuration according to task requirements; it meets the requirements of high-precision multiple transmission modes and corresponding amplitude-phase consistent multiple polarization reception of synthetic aperture radar, effectively increases the working bandwidth of the core antenna under low profile, reduces the radar scattering area of the antenna, optimizes the antenna radiation pattern and reduces the mutual coupling characteristics, further improves the imaging performance of the synthetic aperture radar, and reduces the signal-to-interference ratio of the synthetic aperture radar system.

The present disclosure provides a laser measurement system and method, which is applied to the field of microwave photon technology. The system comprises an antenna, a microwave source, a laser, a polarization controller, a double parallel Mach-Zehnder modulator, an electrical coupler, a photoelectric detector and a signal processing module. The antenna is used to receive a return signal, the microwave source is used to emit a reference signal, the polarization controller controls the polarization direction of the optical carrier emitted by the laser, the return signal and the reference signal are modulated onto the optical carrier with the controlled polarization direction through the double parallel Mach-Zehnder modulator, and a modulated optical signal is output, the modulated optical signal enters the signal processing module after frequency mixing processing by the photoelectric detector, and the signal processing module outputs a final result to obtain the measurement results of Doppler shift and angle of arrival at the same time. The present disclosure can realize the simultaneous measurement of Doppler shift and angle of arrival, determine the direction of Doppler shift, and is not limited by electromagnetic interference and working bandwidth, and has a very large working bandwidth.

The application provides a differential quadrature signal coupler and a radio frequency transceiver system on chip, which combines two first metal wire structures, two second metal wire structures and two dielectric structures to design the differential quadrature signal coupler, one first metal wire structure, one second metal wire structure and one dielectric structure form one coaxial line structure, the differential quadrature signal coupler is designed as two symmetrical coaxial line structures, based on the capacitive coupling effect between the coaxially arranged second metal wire structure and the first metal wire structure, the coupling transmission of the radio frequency signal is realized, on the basis of ensuring signal coupling, the planar area of the differential quadrature signal coupler can be reduced, the size of the corresponding coupling line is reduced, and the loss on the coupler is reduced; when designing and manufacturing, the size parameters of the second metal wire structure and the first metal wire structure can be adjusted according to actual needs, and then the characteristic impedance of the coupler can be adjusted, and the working bandwidth of the coupler is increased.

The present invention discloses a millimeter wave broadband distributed matching circuit and a power amplifier circuit thereof, wherein the millimeter wave broadband distributed matching circuit comprises a distributed transmission network, a lossy network, a first bias network and a second bias network; the distributed transmission network is composed of a plurality of first microstrip lines connected in series with a first capacitor, the lossy network is connected between the distributed transmission network and a reference potential ground for setting the millimeter wave circuit, the first bias network is connected between an output terminal of the distributed transmission network and a terminal of an external power supply, and the second bias network is connected between a terminal where the first section of the first microstrip line and the second section of the first microstrip line in the distributed transmission network are connected and an external power supply. The circuit structure of the present invention is simple, easy to be integrated on a single chip, and is less affected by process fluctuations. It can achieve good impedance matching within a wider frequency range of millimeter waves, and can be applied to millimeter wave power amplifier circuits to greatly improve the working bandwidth of the amplifier and improve the production yield rate.

The invention provides a miniaturized to-be-measured microwave signal phase noise measurement system, and the system comprises a laser which is used for generating an optical carrier signal and outputting the optical carrier signal to an on-chip circulation phase modulator; the on-chip cyclic phase modulator is used for cyclically modulating a microwave signal to be measured onto an optical carrier and outputting the microwave signal to the adjustable optical filter; the delay modulation device is used for modulating the optical carrier signal which is output by the on-chip circulating phase modulator and is modulated for the first time, and outputting the modulated optical carrier signal to the on-chip circulating phase modulator; the adjustable optical filter extracts the optical carrier signal which is output by the on-chip cyclic phase modulator and is modulated for the second time, and outputs the optical carrier signal to the signal processing module; and the signal processing module is used for processing the to-be-processed optical signal output by the adjustable optical filter to obtain the phase noise of the to-be-detected microwave signal. The miniaturized phase noise measurement system for the microwave signal to be measured is simple in structure, easy to integrate and not limited by the working bandwidth of any electrical device.

The present invention discloses a structural multiplexing type low-frequency oscillator, including a base, a bowl-shaped oscillating arm and a plurality of feeding coaxial lines, wherein the bowl-shaped oscillating arm is arranged above the base and is surrounded by a plurality of oscillating arm units, each oscillating arm unit includes an oscillating arm main body and an oscillating arm bending part, the oscillating arm main body includes a bottom and a side wall, the oscillating arm bending part is arranged above the side wall, the bottoms of the plurality of oscillating arm main bodies form a high-frequency reflection plate when high and low frequencies are coaxially nested in the same plane, and the feeding coaxial line is connected to the feeding port on the bottom of the oscillating arm main body. The present invention widens the oscillator arm into a full metal surface structure, increases the metal area of ​​the oscillating arm and the coupling degree between the oscillating arms, thereby effectively increasing the working bandwidth of the antenna while reducing the size of the antenna; the bottom of the oscillating arm after two bends is a planar structure, which can be reused as the reflection ground structure required by the high-frequency antenna when the high-frequency antenna is coaxially embedded, thereby effectively eliminating the high-frequency reflection plate that was originally required extra, and simplifying the overall structure of the antenna.

The invention relates to a novel reconfigurable intelligent metasurface unit structure based on liquid crystal. The novel reconfigurable intelligent metasurface unit structure sequentially comprises a first dielectric layer, a grounding layer, a liquid crystal layer, a reflection patch structure layer and a second dielectric layer from bottom to top. A multi-resonant structure is arranged on the reflection patch structure layer to increase the phase shift amount of the intelligent metasurface unit structure, and a double-layer annular pipeline is arranged on the liquid crystal layer to adjust the reflection phase of the intelligent metasurface unit structure. The reconfigurable metasurface antenna achieves dynamic phase modulation and has the advantages of being high in regulation and control precision, wide in phase shift range, large in working bandwidth, high in integration degree and the like, and the design scheme and the application mode of the reconfigurable metasurface antenna are further expanded.

A wireless energy harvesting system, a spin diode and a preparation method thereof, comprising a microwave antenna, an impedance matching circuit, a microwave rectifier and an energy storage unit connected in sequence; the microwave rectifier adopts a spin diode based on a nano-magnetic tunnel junction. The system of the present invention adopts a spin diode, has the characteristics of high working bandwidth and wide dynamic range, and has high conversion efficiency at low input power.

The invention discloses a large-range, close-range and millimeter-level stepping target delay method and equipment, which are mainly different from the prior art in that a complete delay line is formed by adopting a combination mode that three analog delay line technologies are connected in series and in parallel, and small stepping and short delay are realized by adopting a PCB delay module. Large-distance-range simulation is achieved through the optical fiber delay module, meanwhile, the optical fiber delay module can be short-circuited by a parallel branch, and the coaxial cable delay module is mainly used for achieving distance connection between the maximum delay of the PCB delay module and the minimum delay of the optical fiber delay module.

The invention provides a compact broadband frequency insensitive rectifier for collecting electromagnetic energy in an environment, and aims to face the field of wireless power supply Internet of Things equipment. The invention finds that the double-branch LC series-parallel structure has a key characteristic that the impedance is insensitive to frequency change. By fully utilizing the characteristic, a simple matching network is designed to realize broadband performance. Through a simulation and measurement combined method, the operation effectiveness of the proposed topological structure is verified, and the design of the broadband rectification circuit is successfully realized. The rectification circuits of three different matching networks are compared, and the optimal circuit is determined. Under the input of 8 dBm and the load of 1.2 k omega, the peak power conversion efficiency of the rectifier reaches 74.75%. And the efficiency is kept above 60% at the relative bandwidth of 81.1%. Under the load condition of 0.9 k omega, the relative bandwidth with the efficiency of more than 60% is kept at 81.1%, and the bandwidth with the efficiency of more than 50% is expanded to 100%.

The invention provides intelligent glasses and a communication method thereof, and relates to the technical field of wearable equipment. The smart glasses include a frame, legs extending from the frame, a first antenna, a second antenna, a multiple-input multiple-output antenna, and a processor. The first antenna is arranged on the mirror frame, and the first antenna carries out communication on the L1 frequency band of the GPS frequency. The second antenna is arranged on the mirror frame and is separated from the first antenna, and the second antenna carries out communication on the L5 frequency band of the GPS frequency. The multiple-input-multiple-output antennas are arranged at the ends of the glasses legs, and the processors are arranged at the positions, close to the glasses frame, of the glasses legs and are connected with the first antennas, the second antennas and the multiple-input-multiple-output antennas respectively. According to the intelligent glasses disclosed by the invention, a high-precision positioning and navigation system which can be applied to a global satellite navigation system is realized, and the accuracy and the safety of the positioning system are improved.

The invention discloses an overload self-tuning magnetic field energy collector which comprises a packaging shell, a frame, bias magnets, an energy taking coil, a rotating device and a mechanical tuning device, the frame is installed in the packaging shell and serves as a framework to wind the energy taking coil, the bias magnets are arranged in grooves in the two sides of the packaging shell, the rotating device is arranged in the grooves, and the mechanical tuning device is arranged in the packaging shell. A rotating device is mounted in the frame; the mechanical tuning device is arranged on the outer side of the packaging shell, and a tuning magnet is arranged above the mechanical tuning device. According to the overload self-tuning magnetic field energy collector, a permanent magnet material is utilized, a magnetism gathering ring in a traditional current transformer is not needed, space magnetic field energy taking can be achieved, and installation and maintenance are more convenient; and due to the overload self-tuning design, the function of automatically adjusting the resonant frequency in the working process of the system can be realized, the damage to the bearing is reduced, the damage to the system caused by high-current impact can be avoided, and the working bandwidth of the system is effectively increased.

The invention provides a time-frequency matching distributed weak feedback line width compression structure adaptive to an FDML (frequency division multiplexing laser), which comprises a distributed feedback device and a reflecting device, and is characterized in that an input / output port of a resonant cavity in the FDML is respectively connected with the distributed feedback device and the reflecting device through a beam splitter; the resonant cavity transmits the current sweep frequency band laser signal to the distributed feedback device and the reflection device, and the distributed feedback device filters the current sweep frequency band laser signal and reversely transmits a scattered signal with a reduced line width back to the resonant cavity; and the reflection device reflects the current sweep frequency band laser signal back to the resonant cavity, so that the scattering signal and the reflected laser signal synchronously reach the resonant cavity, synchronous oscillation is performed in the resonant cavity, and the line width of the current sweep frequency band laser signal is compressed into the line width of the scattering signal. According to the invention, large-wavelength-range stable line width compression of the FDML frequency sweeping laser can be realized.