607results about How to "Improve working bandwidth" patented technology

The invention relates to the technical field of optical communication and discloses an optical grating coupler and an optical signal coupling method. The optical grating coupler comprises a top silicon layer, a base silicon layer and a silicon dioxide layer, wherein the silicon dioxide layer is arranged on the upper surface of the base silicon layer, the top silicon layer is disposed on the upper surface of the silicon dioxide layer, the top silicon layer is of a structure formed by ranking at least two right triangles in the direction perpendicular to the light transmission direction, and received optical fibers face toward the rank structure of the right triangles. According to the optical grating coupler and the optical signal coupling method, through application of triangular optical gratings, work bandwidth of the optical grating coupler is increased, and applicability of the optical grating coupler is improved; besides, simulating calculation is performed through a three-dimensional time domain finite difference method so that TE and TM light coupling efficiencies are the same, optical grating structural parameters are determined, polarization insensitivity is achieved; the optical grating coupler has the advantages of being simple in structure, wide in work bandwidth, low in polarization loss and high in coupling efficiency.

The invention provides an inter-board perpendicular interconnection circuit structure for a substrate integrated ridge waveguide (SIRW), and aims to provide a millimeter wave inter-board perpendicular interconnection circuit structure with small volume, easy integration, high interconnection property and long-term reliability. The inter-board perpendicular interconnection circuit structure is implemented by the following technical scheme: the SIRW (3) perpendicular to the surface of a base board is integrated on an LTCC multilayered circuit board (1); a substrate integrated ridge waveguide opening is etched in a corresponding outlet in the metal ground on the surface of the LTCC multilayered circuit board (1); Z-direction metalized filling holes (2) are arranged to form a metal hole gate array to equivalently form the waveguide wall and single-side ridges in the waveguide; metallic shield holes and probe restraining cavities (7) on the two sides of a 50-ohm strip line (8) are arranged at the equal spacing; and the alignment pressing and connection of the SIRW interfaces on the opposite sides between two boards is realized through pin hole alignment, so that the perpendicular interconnection transition of the millimeter wave signal between two boards in a way of 50-ohm strip line-SIRW-SIRW-50-ohm strip line is realized consequently.

The invention provides a polarization beam splitter rotator and a design method thereof. The polarization beam splitter includes a double-layer trapezoidal mode converter and a reverse tapered coupler which are connected in series; the double-layer trapezoidal mode converter converts a transverse magnetic wave zero-order mode into a transverse electric wave first-order mode, and the reverse tapered coupler converts the transverse electric wave first-order mode into a transverse electric wave zero-order mode. The width of a first trapezoidal waveguide and a second trapezoidal waveguide is selected, and according to a relation between waveguide length and mode conversion efficiency, the length of the first trapezoidal waveguide and the second trapezoidal waveguide is determined; and the width of a third trapezoidal waveguide and a fourth trapezoidal waveguide is selected, and according to a relation between the waveguide length and mode conversion loss, the length of the reverse tapered coupler is determined. Characteristics of large working bandwidth, high conversion efficiency and high manufacturing tolerance and the like are realized through parameter optimization, the polarization beam splitter rotator can be used for improving practicability of a single-fiber three-way multiplexer, in addition, a manufacturing method is simple, is compatible with a standard silicon photon processing technological process, and the polarization beam splitter rotator and the design method thereof have relatively high practical value and good application prospects.

The invention provides a waveguide flat array antenna, which has the characteristics of broadband and high-efficiency feed. Rectangular open waveguides 11 are used as radiation units; four rectangular open waveguides in one group form a sub array, and are arranged in a 2*2 rectangle and supplied with broadband equal-amplitude in-phase feed by a rectangular cavity 21; and in order to ensure efficient transmission of electromagnetic wave, the joint of each rectangular open waveguide 11 and the rectangular cavity 21 is provided with matched steps 13 and 23. The center of the rectangular cavity 21 is provided with a rectangular window 22 which is connected with a feed network of the next layer. In order to ensure smooth signals, a rectangular matching block 42 is arranged at the feed network corner connected with each rectangular window 22. The feed network consists of multistage parallel E-T so as to ensure that the antenna has enough bandwidth. The transceiving capacity of circularly polarized wave is realized by arranging a circularly polarized cover. Compared with the conventional flat antenna, the waveguide flat array antenna has broader bandwidth and higher feed efficiency.

The invention discloses a silicon-based metamaterial optical beam splitter and a manufacturing method thereof and belongs to the field of integrated photoenic devices. A 50:50 optical power beam splitter in the prior art is narrow in working broadband, poor in port consistency and high in loss. The optical beam splitter comprises a substrate. The substrate comprises an input waveguide and two output waveguides. A coupling area composed of N*N pixel blocks of the same size are positioned between the input waveguide and the output waveguides. By punching the pixel blocks, a special punching array is formed through an optimization algorithm. Due to the fact that configuration of an air hole array of sub-wavelength sizes can be equivalent to an evenly tempolabile refractive index distribution area, different wavelengths can be guided simultaneously, so that the goal of effectively outputting the different wavelengths at an output port can be achieved, and the goal of large working bandwidth is achieved.

The invention discloses a graphene electrode-based reflecting liquid crystal phase shift unit, which comprises two upper and lower layers of dielectric substrates, wherein a liquid crystal layer is injected into a gap between the two upper and lower layers of dielectric substrates; a plurality of metal patches which are sequentially connected in series through a connection line are arranged on the lower surface of the upper layer of dielectric substrate to form a layer of metal microstrip structure; a graphene layer completely covers the upper surface of the lower layer of dielectric substrate to form a graphene electrode; and a metal layer completely covers the lower surface of the lower layer of dielectric substrate to form a metal grounding electrode. The continuous phase shift characteristic is obtained within a broadband in an electric control manner; and the graphene electrode-based reflecting liquid crystal phase shift unit has the characteristics of being small and easy to process.

This invention relates to a broadband single ridge waveguide slot array, resolving that the size, weight, loss, scanning angle and other aspects of existing waveguide slot array can not meet the special requirements. Its features are: the radiation waveguide has symmetric metal-single ridge on the center line of hemline and rectangular cross section, which connects with the feeding waveguide just below the bottom. The feeding waveguide has symmetric metal-single ridge on the hemline centerline. Coupling gap is set between radiation and feeding waveguide horizontally. The invention uses a single-ridge radiation waveguide to reduce the width of antenna, divides array into a number of sub-ones and feeds by power divider to improve the working bandwidth, uses ridge waveguide antenna to improve efficiency and reduce processing difficulties, uses coaxial connectors to easily realize impedance matching.

The invention discloses a millimetre wave planar antenna and an array thereof, wherein the millimetre wave planar antenna includes a metal patch, a medium substrate, a metal floor board and ground poles, the metal patch is placed on an upper surface of the medium substrate, and a lower surface of the medium substrate is fixed with an upper surface of the metal floor board; the metal patch is parallel to the upper surface of the metal floor board; the metal patch is provided with at least one pair of same first bar-shaped channels, each pair of first bar-shaped channels are distributed in bilateral symmetry form, symmetrical centre lines of each pair of bar-shaped channels are superposed, a centre line in a length direction of each first bar-shaped channel is parallel to each other, and length of each first bar-shaped channel is 1/2 of an operating wavelength; the ground poles vertically penetrate through the medium substrate, the ground poles are circularly distributed at intervals at the periphery of a region where the first bar-shaped channels are distributed, and two ends of each ground pole are respectively contacted with the metal patch and the metal floor board. The invention can reduce loss of a millimetre wave antenna, improve radiation efficiency of the millimetre wave antenna, simultaneously, guarantee work bandwidth of the antenna, and improve antenna gain.

The invention relates to an SIC technology-based four-element dual-polarization microstrip antenna array, which comprises six layers of printed circuit boards and metal supports (6), wherein the lowersurface of a top layer of printed circuit board (17) is printed with rectangular parasitic patches (1); the upper surface of a third layer of printed circuit board (16) is printed with rectangular main patches (2) and a main patch layer reflection plate (11); the upper surface of a fourth layer of printed circuit board (15) is printed with a vertical-polarization feeder line (3) and a ring (8); the upper surface of a fifth layer of printed circuit board (14) is printed with a grounding plate (4); cross gaps (9), circular openings (19) and circular openings (20) are etched on the grounding plate (4); a horizontal-polarization feeder line (5) and a strip line (10) are printed on the lower surface of the fifth layer of printed circuit board (14); and the lower surface of the bottom layer ofprinted circuit board (12) is provided with an antenna bottom reflection plate (13). The SIC technology-based four-element dual-polarization microstrip antenna array has the advantages of wider bandwidth, higher port isolation and lower cross polarization level.

The invention discloses a silicon-based nanowire polarization beam splitter based on the mode evolution principle, and can be used for the fields of integrated optics and silicon-based photonics. A vertical hybrid plasma waveguide (3) and a horizontal hybrid plasma waveguide (4) are respectively arranged at the two sides of a tapered transitional waveguide (2), and distance to the tapered transitional waveguide (2) is maintained to be consistent. An input waveguide (1) is connected at the lower end of the tapered transitional waveguide (2). A first S-shaped waveguide (5) is connected at the upper end of the vertical hybrid plasma waveguide (3). A first output waveguide (7) is connected at the upper end of the first S-shaped waveguide (5). A second S-shaped waveguide (6) is connected at the upper end of the horizontal hybrid plasma waveguide (4). A second output waveguide (8) is connected at the upper end of the second S-shaped waveguide (6). The device has advantages of being high in polarization beam splitting efficiency, low in loss, high in manufacturing tolerance and high in work bandwidth, and can also be used for constructing an on-chip polarization diversity scheme so as to realize polarization independent transmission.

A dual band and broadband flat dipole antenna comprises a first radiating body, a second radiating body, and a conductivity element. The first radiating body has two first frequency-radiating parts, two second frequency-radiating parts, and a first electrically connecting part. The first and second frequency-radiating parts are extended from a side of the first electrically connecting part. The second frequency-radiating parts are disposed between the first frequency-radiating parts. The second radiating body similar to the first radiating body has two first frequency-radiating parts, two second frequency-radiating parts, and a second electrically connecting part. The first and second frequency-radiating parts are extended from a side of the second electrically connecting part with the direction reversing to the extending direction of the first radiating body. The conductivity element has a conductivity body and a grounding conductor electrically connected with the first electrically connecting part and the second electrically connecting part, respectively.

The invention discloses a broadband circularly-polarized waveguide antenna and an antenna array thereof. The antenna comprises a radiation layer, a cavity layer, a feed network layer and a circularly-polarized network layer, wherein the radiation layer, the cavity layer, the feed network layer and the circularly-polarized network layer are sequentially stacked to form a multilayer stacked structure. One side, backing on to the cavity layer, of the radiation layer is provided with 8*8 radiation units which are arranged in an array. Each radiation unit comprises a circular ridge opening waveguide with two symmetric ridges, and a first coupling feed straight gap which is disposed on a bottom wall of the circular ridge opening waveguide, wherein the two ridges are located at two opposite sides of the first coupling feed straight gap, and the vertical connection line of the two ridges and the first coupling feed straight gap form a 45-degree inclined angle. The 8*8 radiation units are divided into four radiation unit groups, and each radiation unit group comprises 4*4 radiation units which are arranged in an array. One radiation unit group is taken as a fixed point reference, and other three radiation unit groups sequentially rotate 90 degrees, 180 degrees and 270 degrees anticlockwise or clockwise.

The invention relates to a high gain broadband dielectric lens Vivaldi antenna. The array antenna comprises a substrate, a radiation slot, a dielectric lens and a Chebychev tapered strip line feeder. According to the high gain broadband dielectric lens Vivaldi antenna, through changing the structural size of the dielectric lens, the fluctuation of antenna radiation impedance can be effectively improved so as to obtain better impedance matching, the transmission speed of an electromagnetic wave in the slot can be reduced according to the high dielectric constant of the lens, the current distribution on an antenna aperture is improved, thus a spherical wave is a nearly a plane wave, the antenna radiation efficiency is raised, and a higher antenna gain is obtained. According to a Chebychev tapered strip line, the impedance matching of the antenna can be improved further, and the working band is broadened. The array antenna in the invention has the characteristics of high gain and broad band and is suitable for a radiation unit of wideband array antennas of the field of mobile communication and a military radar.

The invention discloses a multi-micropacket parallel processing structure, which aims to solve the problem that in a single-micropacket processing structure, the bandwidth of a physical layer and a link layer is not matched, so that the speed of the processing of the chip of a node controller to the communication among processors is reduced. The multi-micropacket parallel processing structure comprises an interface conversion module, a receiving module, a receiving buffer area, a message distribution module, a first protocol layer message FIFO (First In First Out), a second protocol layer message FIFO, a link state machine, a message assembly module, a send buffer area, a retransmission buffer area and a sending module, wherein the interface conversion module works under a physical layer clock domain, other modules work under a link layer clock domain, the interface conversion module comprises asynchronous receiving FIFO and asynchronous transmission FIFO, and data paths in the receiving module and the sending module are multi-path parallel data paths aiming at multi micropackets, and can process the multi micropackets in parallel. According to the invention, the bandwidth of the physical layer/the link layer is matched, so that the speed of the processing of the chip of the node controller to the communication among the processors is improved.

The invention discloses a broadband directional microstrip patch antenna which is sequentially provided with a first medium layer, a microstrip feeder network arranged on the first medium layer, a second medium layer, a slit grounding surface arranged on the second medium layer, a third medium layer and a radiation patch array arranged on the third medium layer from bottom to top. The broadband directional microstrip patch antenna is simple to process and easy to assemble.

The present invention provides a multi-beam integrated waveguide antenna, belongs to the field of radar antennas, and aims to solve the problems that an anti-collision radar in an existing phased array system is expensive, has high difficulty in extracting a target algorithm in a complex environment, is complex in system hardware and the like. The multi-beam integrated waveguide antenna has the technical key points that the antenna is formed by integrating a substrate integrated waveguide antenna array at a first layer, (2n-2) layers of strip-shaped lines and a microwave circuit at a bottom layer; and the microwave circuit mainly comprises X one-in-(2n-1) unequal power dividers, and (2n-1) one-in-X unequal power dividers, wherein n+1 is the number of formed beams, n is greater than or equal to 2, and X is the number of units of an array antenna. The multi-beam integrated waveguide antenna has the effects that array amplitude and phase distribution are implemented by means of the power dividers and the shift-phase micro-strip lines so as to implement multiple beams, and on the basis, the number of the beams can be extended.

The invention discloses a piezoelectric energy collector based on a linear resonator and a nonlinear vibration exciter. The piezoelectric energy collector comprises an energy collecting structure and an energy collecting circuit, wherein the energy collecting structure comprises a piezoelectric cantilever beam, the linear resonator and the nonlinear vibration exciter. According to the piezoelectric energy collector, the linear resonator is further arranged on the piezoelectric cantilever beam, so that two resonance peaks which are close to each other are obtained, and a reverse resonance peak of the energy collector can be further moved outside of the two resonance peaks through designing parameters such as the mass ratio, the frequency ratio and the position ratio of the linear resonator and the piezoelectric cantilever beam, so that a wider working band can be obtained; the arrangement of the nonlinear vibration exciter can increase the number of the resonance peaks of a system, and the working band of the system can be further expanded through designing system parameters, or the performance at a valley between the two resonance peaks can be improved.

The invention discloses a low-power-consumption broadband radio frequency mixer adopting multichannel feedback transconductance enhancement and common mode feedback active load, in order to solve the problems of relatively narrow working band and relatively high noise coefficient of the existing mixer, and further improve the linearity and the power consumption performance. The mixer comprises a signal input stage (1) composed of resistors and capacitors, a transconductance stage (2) composed of a multichannel feedback dual transconductance enhancement structure, a switch stage (3) composed of symmetrical switch tubes and a load stage (4) composed of the common mode feedback active load. According to the low-power-consumption broadband radio frequency mixer disclosed by the invention, multichannel feedback is imported to the transconductance stage of the mixer to improve the conversion gain of the mixer, realize the compromise of the mixer gain and the input match, and expand the working band of the mixer. The multichannel feedback used in the low-power-consumption broadband radio frequency mixer disclosed by the invention also realizes noise cancelation and optimizes the noise performance of the mixer. According to the low-power-consumption broadband radio frequency mixer disclosed by the invention, the common mode feedback active load is used in the load stage to optimize the linearity performance of the mixer. The low-power-consumption broadband radio frequency mixer disclosed by the invention has the advantages of simple structure, easy realization and small occupation area.