14results about How to "Improve working bandwidth" patented technology

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 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 application discloses a PIN diode with an arc-shaped gradually-changing tube core, which comprises a substrate and a diode packaging structure, wherein the diode packaging structure is arranged on the substrate; the diode packaging structure comprises a first anode metal plate, an anode air bridge, a tube core, a cathode metal plate and an N-type high-doped layer; the first anode metal plate is connected with a second anode metal through the anode air bridge; the tube core comprises the second anode metal, a P-type high-doped layer and a semiconductor I layer; the second anode metal plate is in contact with the P-type high-doped layer to form an anode ohmic contact electrode; the cathode metal plate is in contact with the N-type high-doped layer to form a cathode ohmic contact electrode; the P-type high-doped layer is arranged directly below the second anode metal plate; and the semiconductor I layer is arranged between the P-type high-doped layer and the N-type high-doped layer. The application can eliminate the electric field concentration effect and improve the maximum withstand power of the diode by adjusting the gradually-changing shape.

The invention relates to a large-stroke piezoelectric driving micro clamp. The large-stroke piezoelectric driving micro clamp is characterized by comprising a fixed seat, a driver and a bridge type amplification mechanism, the fixing seat is arranged at the bottom of the bridge type amplifying mechanism, and the driver is arranged in the bridge type amplifying mechanism and used for driving the bridge type amplifying mechanism; the device comprises a base, two longitudinal connecting rods, a secondary amplification mechanism and a clamp, the secondary amplification mechanism comprises a first cross beam, a second cross beam, a first longitudinal beam, a second longitudinal beam, a first rotating hinge, a second rotating hinge, a first clamping jaw and a second clamping jaw; the first cross beam and the second cross beam are symmetrically arranged, the first longitudinal beam and the second longitudinal beam are symmetrically arranged, the first rotating hinge and the second rotating hinge are symmetrically arranged, the first clamping jaw and the second clamping jaw are symmetrically arranged, and the clamps are symmetrically arranged. The large-stroke clamping mechanism has the advantages that large-stroke clamping operation is achieved on the occasion that the installation space is limited, displacement amplification is achieved, and meanwhile it is guaranteed that the higher working bandwidth is achieved.

The embodiment of the utility model discloses an antenna assembly and electronic equipment, and a waveguide device is arranged in a protective shell, so that the waveguide device is protected and fixed by using the protective shell. Therefore, the connector is connected with the grounding part through the protective shell, so that the waveguide structure and the protective shell form a first electrical path. The first radiator and the protective shell form a first radiation unit, the second radiator and the protective shell form a second radiation unit, and the protective shell is used for receiving and transmitting electromagnetic signals. Therefore, metal breakpoints are prevented from being formed on the protective shell, and the mechanical strength of the protective shell and the signal gain of the antenna assembly are improved. And meanwhile, the manufacturing cost of the protective shell is reduced. And on the other hand, the impedance of the second radiation unit is improved by utilizing the coupling gap between the grounding part and the second radiation body, so that when the antenna assembly is in different working frequency bands, the waveguide device and the radio frequency circuit still have better impedance characteristics, and the working bandwidth of the antenna assembly is improved.

The application provides a Beidou navigation antenna, and relates to the technical field of antennas, and comprises an antenna plate, a first metal plate and a second metal plate.The antenna plate comprises a first dielectric substrate, a first radiator and a second radiator formed on two side surfaces of the first dielectric substrate respectively, and the first radiator and the second radiator constitute a dipole radiator; the first metal plate comprises a second dielectric substrate and a first metal patch formed on one side surface of the second dielectric substrate, and the first metal patch is provided with a first through hole which is consistent with the shape and size of the dipole radiator; and the second metal plate comprises a third dielectric substrate and a second metal patch formed on one side surface of the third dielectric substrate, and the second metal patch is provided with a second through hole which is consistent with the shape and size of the dipole radiator.The technical scheme provided by the application can greatly expand the working bandwidth of the antenna by loading the first metal patch and the second metal patch which are consistent with the shape and size of the dipole radiator on both sides of the dipole radiator.

This invention discloses a mode-division multiplexer (MDD) based on a five-core photonic crystal fiber. The MMDD includes a substrate and an air-hole layer region disposed on the substrate. The air-hole layer region is composed of a plurality of air holes arranged in a pattern, and is divided into a core region and a cladding region, with the cladding region enclosing the core region. The core includes a main core region, a first side core region, a second side core region, a third side core region, and a fourth side core region. The main core region is located at the center of the substrate, and the first, second, third, and fourth side core regions surround the main core region. The cladding region surrounds the main core region. This invention modulates the incident light in the side core regions into coupled light in the main core region, thereby increasing the operating bandwidth of the MMDD and reducing insertion loss, while effectively shortening the device length. This makes the MMDD suitable for miniaturized and integrated optical fiber communication systems and MMDD systems.

The application discloses a TM mode polarizer based on a cascaded antisymmetric multimode Bragg grating structure, which comprises an input waveguide group, a first grating, a connecting waveguide group, a second grating and an output waveguide group which are sequentially connected along a transmission direction, a plurality of columns of period units are arranged in the first grating and the second grating respectively, a displacement difference is arranged between two adjacent columns of period units in a horizontal direction, and the periods of the first grating and the second grating are not equal. The application has the advantages of compact structure, large working bandwidth, low insertion loss in an effective working bandwidth and high extinction ratio. Two antisymmetric multimode Bragg gratings with different periods are cascaded to convert input TE0 mode signal light into reversely transmitted TE1 mode, the reversely transmitted TE1 mode is leaked into a cladding through a tapered waveguide, input TM0 mode signal light is directly transmitted through the waveguide without being affected, and finally, low-insertion-loss, high-extinction-ratio and large-bandwidth TM0 mode light signals are obtained at an output end of a single-mode output waveguide.

The utility model provides a radio frequency energy bidirectional digital tuning circuit and a radio frequency energy acquisition system, and relates to the technical field of integrated circuits, and the radio frequency energy bidirectional digital tuning circuit comprises a capacitance increasing circuit, a capacitance reducing circuit and a finite-state machine. Wherein a first port of the capacitance increasing circuit and a third port of the capacitance reducing circuit are connected in parallel; a second port of the capacitance increasing circuit and a fourth port of the capacitance reducing circuit are connected in parallel; the finite-state machine is respectively connected with a bias voltage end of the capacitance increasing circuit and a bias voltage end of the capacitance reducing circuit, and is used for providing bias voltage for the capacitance increasing circuit and the capacitance reducing circuit; the capacitance increasing circuit is used for increasing the capacitance of the radio frequency energy bidirectional digital tuning circuit; and the capacitance reduction circuit is used for reducing the capacitance of the radio frequency energy bidirectional digital tuning circuit. According to the technical scheme of the embodiment of the utility model, bidirectional tuning can be realized, and the working bandwidth of the tuning circuit is expanded.