145results about How to "Easy to conform" patented technology

A remote control flexible instrument system, employing a shaft which supports a tool, is described in which the has proximal and distal ends with at least a portion thereof extending through a lumen of the human body so as to locate the shaft at an internal target site. A master station including an input device provides control of the instrument situated at a slave station. The master station can control at least one degree-of-freedom of the flexible instrument. A controller intercouples the master and slave stations and is operated in accordance with a computer algorithm that receives a command from the input device for controlling at least one degree-of-freedom of the catheter so as to respond in accordance with action at the input device. The flexible instrument further comprises a controlled flexible segment along the shaft, for controlled bending at the flexible segment to guide the shaft and to dispose the tool at an operative site.

A remote control flexible instrument system, employing a shaft which supports a tool, is described in which the has proximal and distal ends with at least a portion thereof extending through a lumen of the human body so as to locate the shaft at an internal target site. A master station including an input device provides control of the instrument situated at a slave station. The master station can control at least one degree-of-freedom of the flexible instrument. A controller intercouples the master and slave stations and is operated in accordance with a computer algorithm that receives a command from the input device for controlling at least one degree-of-freedom of the catheter so as to respond in accordance with action at the input device. The flexible instrument further comprises a controlled flexible segment along the shaft, for controlled bending at the flexible segment to guide the shaft and to dispose the tool at an operative site.

A nonwoven fabric sheet comprising a multiplicity of generally parallel elongate strands of inelastic thermoplastic material extending in a first direction in spaced relationship, each of said strands having opposite elongate side surface portions that are spaced from and are adjacent elongate side surface portions of adjacent strands, and each of said strands also having corresponding opposite first and second elongate surface portions extending between said opposite elongate side surface portions, and a first sheet of flexible nonwoven material having spaced anchor portions bonded at first bond sites of the strands along said first elongate surface portions wherein the elongate strands thermoplastic material is oriented at least between adjacent bond sites along the length of the strands.

Described herein is a mitral valve and systems and methods for implanting the same. The mitral valve device is designed to easily orient to and conform to the mitral orifice natural morphology. This mitral valve system may be implanted using a system of 2 guide wires that facilitate orientation of the flat portion of the stent properly with the flat portion of the mitral valve that is adjacent to the aortic valve. Additionally, the disclosed valve may have multiple mounds distributed across the outer surface of the valve / stent complex so as to prevent or reduce paravalvular leak after implantation.

The invention discloses a high-isolation double-unit MIMO (multiple input multiple output) antenna array which is characterized in that: two independent resonant modes are produced through two C-like radiating units and two inverted-L-shaped radiating units printed on the front and back surfaces of a dielectric substrate, and used for controlling the double frequency characteristics of an antenna; and on the premise of realizing double-frequency coverage, a decoupling structure is formed on an additional floor unit printed on the front surface of the dielectric substrate and an isolation groove formed on a floor, so that the isolation between antenna units in a multi-frequency range is improved, and the bandwidth performance of dual-frequency operation is ensured.

The invention relates to a low-profile lens antenna capable of realizing wide-angle scanning. The lens antenna comprises a lens and a feed source positioned on the focal plane of the lens; beam scanning and tracking can be realized by mechanical control on the feed source; the lens has an electromagnetic wave focusing function, and the appearance of the lens can be flat-plate-shaped or curved-surface-shaped, and conformal design with a carrier platform can be realized; the effective dielectric constant distribution characteristic of the lens is that the effective dielectric constants are decreased from the center to the edges along the horizontal and longitudinal directions; the regulation and control on the effective dielectric constants can be realized by changing the structure or dimensions of the metamaterial units; and the assembling and preparation of the lens at a low cost is realized by multiple metamaterial panels in a stacked manner. The low-profile lens antenna has the characteristics of broadband, high gain, low profile, easy conformal property and the like, and is particularly suitable for high-gain conformal vehicle-mounted or missile-borne platforms in the fields of communication measurement and control, and the like.

The invention discloses a waveguide structure based on an artificial surface plasmon device. The waveguide structure comprises a dielectric layer, a first metal sheet and a second metal sheet, the first metal sheet and the second metal sheet are oppositely and fixedly connected on two sides of the dielectric layer, periodically arranged grooves are formed in the first metal sheet and the second metal sheet respectively, the depths of the grooves positioned in the middles of the metal sheets are equal, and the depths of the grooves positioned in two ends of each metal sheet are gradually increased from the end to the middle respectively until the depths are equal to the depths of the grooves positioned in the middles of the metal sheets. Novel artificial surface plasmon units are specifically arranged to form the waveguide structure, a curved surface arch circuit is conveniently manufactured, and the waveguide structure has a high practical value. The invention further provides an amplifier of the waveguide structure based on the artificial surface plasmon device, and the amplifier can amplify an artificial surface plasmon wave in a wide frequency band.

Single-walled carbon nanotubes (SWNTs) are decorated with metal nanoparticles to form high-performance flexible hydrogen sensors. The special process to form the high-performance flexible hydrogen sensors can combine a dry transfer printing technique and modification of SWNTs with palladium (Pd) nanoparticles to provide high-performance hydrogen sensors with excellent mechanical flexibility on plastic substrates. Two approaches can be used to decorate the SWNTs. One is physical deposition, such as electron beam evaporation (EBE) and the other is electrochemical deposition which can selectively grow palladium nanoparticles on the surface of the SWNTs, resulting in significantly decreasing the use of palladium. Preferably, the Pd nanoparticles are deposed on the SWNTs in a discontinuous arrangement so that the Pd nanoparticles are spaced away from each other to form individual discontinuous Pd nanoparticles rather a continuous Pd film. Advantageously, the SWNTs are arranged with substantial semiconducting pathways. Desirably, the high-performance flexible hydrogen sensors have an excellent response and recovery time, provide superior sensitivity for detecting hydrogen, and are bendable to conform to the contours of other structures.

The invention provides a dual-mode vortex wave beam dual-circular polarization four-element array antenna having a concise structure. By adopting a circular polarization unit continuous rotating technology, a phase difference required by generating of vortex wave beams is acquired, and by adopting array element equiamplitude in-phase feeding, a feeding network structure is simplified to a great extent. The array antenna comprises four parasitic units, an upper layer dielectric substrate, four excitation units, a middle layer dielectric substrate, a metal layer floor, a lower layer dielectric substrate, and a feeding network. The parasitic units and the excitation units are disposed on the upper surface of the upper layer dielectric substrate and the upper surface of the middle layer dielectric substrate. An air layer is used to separate the upper layer dielectric substrate and the middle layer dielectric substrate. The feeding network is disposed on the lower surface of the lower layer dielectric substrate, and the feeding network is connected with the excitation units by adopting a metal probe penetrating the floor. A left circular polarization wave having a vortex mode of 1=+1 and a right circular polarization wave having the vortex mode of 1=-1 are generated, and at the same time, a good circular polarization radiation characteristic is provided, and in addition, the antenna has advantages of concise structure, small size, low profile, light weight, and easy conformality.

Treatment articles capable of conforming to an underlying shape and methods for their use are provided. The articles comprise a water insoluble substrate having at least one elongation zone where at least a portion of the elongation zone has been incrementally stretched. The article also includes a treatment composition which preferably delivers a skin care active. Preferred articles of the present invention comprise facial treatment masks.

The invention discloses a single frequency band microwave absorber and a multiple frequency band microwave absorber, wherein the multiple frequency band microwave absorber comprises a plurality of annular artificial electromagnetic materials (1), a metallic back board (3) and a medium substrate (2) arranged between the metallic back board (3) and the annular artificial electromagnetic materials (1); the annular artificial electromagnetic materials (1) are mutually embedded and sleeved and are concentrically arranged; and the single frequency band microwave absorber comprises an annular artificial electromagnetic material (1), a metallic back board (3) and a thickness-adjustable medium substrate (2) arranged between the metallic back board (3) and the annular artificial electromagnetic material (1). The multiple frequency band microwave absorber disclosed by the invention has a perfect absorbing effect for large-angle oblique-incidence microwaves. In practical application, the electromagnetic environment is complicated and oblique-incidence waves are commoner than normal-incidence waves, thus the single frequency band microwave absorber and the multiple frequency band microwave absorber can excellently suit the complicated electromagnetic environment. The annular artificial electromagnetic materials (1) adopted by the single frequency band microwave absorber and the multiple frequency band microwave absorber are single-layer, so that the single frequency band microwave absorber and the multiple frequency band microwave absorber have thin thickness and light weight and are easy to conform.

The invention discloses a K / Ka dual-band common-aperture antenna array, aiming to provide an antenna array surface capable of reducing the antenna profile, covering K and Ka bands and sharing a dual-band aperture. The invention is implemented by the following technical schemes: K-band patches are distributed on a dielectric substrate in the form of a uniform rectangular array, Ka-band patches areinterspersed in the center of the interval of adjacent K-band patches in an interpolation manner, the K-band patches are in orthogonal connection with a bonding pad located on the bottom surface of the dielectric substrate through a feeder pillar that penetrates through the dielectric substrate, the bonding pad is connected with a coaxial feeder, and the coaxial feeder penetrates through a metal base plate to connect with the bonding pad and feeds in a touch-type connection manner, wherein the K-band patches are combined with the metal base plate through the feeder pillar to form a K-band antenna array surface, the feeder pillar is connected with the coaxial feeder through the bonding pad to form a K-band channel; and the Ka-band patches are combined with the metal base plate through the feeder pillar to form a Ka-band antenna array surface, and the feeder pillar and the bonding pad conduct the coaxial feeder to form a Ka-band channel.

A half-wave transmission decoupling small-pitch microstrip array antenna in the field of wireless communication technology, comprising: a dielectric plate, two radiation array units, a half-wave transmission microstrip decoupling unit, a ground plate and two feed elements, wherein: The two radiation array units and the half-wave transmission microstrip decoupling unit are attached to one side of the dielectric board, and the ground plane is arranged on the other side of the dielectric board. The first radiation array unit and the second radiation array unit are respectively connected to the first The feed element is connected to the second feed element, the half-wave transmission microstrip decoupling unit is respectively connected to two radiation array units, both the feed elements are connected to the ground plate, and the two radiation array units form a dual antenna array structure. The invention uses a traditional microstrip line as a decoupling unit, which is easy to conform, has a simple structure, can better improve coupling, and has high isolation.

The invention provides a planar high-gain microstrip reflectarray antenna comprising a feed source, a polarized grid and a reflecting surface. The feed source is composed of a 2*2 microstrip patch array. The polarized grid is composed of a printed dipole array. The reflecting surface is in an array unit design composed of 96 reflecting units; a microstrip metal patch layer of each reflecting unit is a square microstrip patch. The polarized grid and the reflecting surface are hinged and fixed through a support of metal posts, so that polarization direction of printed dipoles of the polarized grid is consistent to that of the feed source. In this way, a foldable reflectarray antenna is made. The planar high-gain microstrip reflectarray antenna has the advantages of simplicity in structure and feed, high gain, low profile, high polarization purity and the like; processing is easy, manufacturing cost is low, and the antenna is easily acceptable and producible to processing enterprises.

The invention discloses metamaterial-based small dual-frequency MIMO (multiple input and multiple output) antennas. The antennas are symmetric bilaterally and comprise an FR4 substrate; two rectangular grounding plates, a micro-strip line and a circular monopole antenna are arranged at two sides of the upper surface of the rectangular FR4 substrate; two rectangular grounding plates are symmetrically distributed at two sides of the micro-strip line; the micro-strip line is connected with the circular monopole antenna; a rectangular groove along the direction of the micro-strip line and an arch-shaped groove concentric to the circular monopole antenna are formed on the circular monopole antenna; one end of the rectangular groove is communicated with the arch-shaped groove and the other end is connected with an interdigital capacitor; and a split resonant ring is arranged at the middle of the upper surface of the rectangular FR4 substrate. The metamaterial-based small dual-frequency MIMO antennas have low cost, smaller size, dual-frequency features and wider impedance bandwidth in the frequency bands of WLAN 2.4GHz and 5GHz; and the antennas have the advantages of low coupling, high isolation, low profile, easy conformation and convenience in processing and manufacturing and the like.

The invention discloses a novel phased-array antenna based on a digital phase control electromagnetic surface. The novel phased-array antenna comprises a feed source and the digital phase control electromagnetic surface, the feed source is used for providing a space irradiation source for the digital phase control electromagnetic surface or receiving scattering electromagnetic waves of the digital phase control electromagnetic surface, and the feed source feeding mode is a reflecting type that the feed source is arranged in front of the digital phase control electromagnetic surface or a transmission type that the feed source is arranged behind the digital phase control electromagnetic surface. The digital phase control electromagnetic surface comprises a plurality of digital phase control radiation units, and each digital phase control radiation unit comprises a radiation module, a direct-current bias circuit and a digital control device integrated with the radiation module. The direct-current bias circuits are used for providing bias current for the radiation module. The radiation modules have different radiation phases under regulation and control of the digital control device. The novel phased-array antenna has the following advantages of being small in feeding loss, high in radiation efficiency, high in wave beam scanning speed, high in array scale extensibility, simple in structure, low in section, low in weight, easy to conform and low in cost.

The invention discloses a double-fed dual-frequency dual-circular-polarization microstrip patch antenna and aims at providing a circularly polarized microstrip patch antenna with the random frequencyratio and antenna polarization mode. The antenna is characterized in that an upper patch feed point is arranged at a patch axis and a lower patch feed point is arranged at a lower square patch diagonal line to form a double-feed mode with two feed points in independent feeding. A perturbation element is formed at the corner cut of the diagonal line of an upper square microstrip patch and two degeneracy dies that are arranged orthogonally in a phase difference of 90 degrees are excited, so that currents at the patch flow circularly along center areas of the tops of four groups of groove lines of the patch to realize high-frequency-point circular polarization. Unequal-length T branches are loaded at the opposite angles around a lower microstrip antenna patch covered by the upper microstrip antenna patch and two degeneracy dies that are arranged orthogonally in a phase difference of 90 degrees are excited, so that the currents on the patch flow circularly along the T-shaped branches at the edge of the patch to realize low-frequency-point circular polarization. The upper antenna and the lower antenna are laminated concentrically to form a dual-frequency dual-circle polarization workingstate.

The invention discloses a circular polarized antenna with omnidirectional broad axial ratio beam width. The circular polarized antenna comprises a parasitic element, an upper-layer medium baseplate, an exciting element, a middle-layer medium baseplate, an earthing unit, a lower-layer medium baseplate and a 3dB mixed electric bridge electric feeding network, wherein the parasitic element and the exciting element are respectively arranged on the upper surfaces of the upper-layer medium baseplate and the middle-layer medium baseplate; the upper-layer medium baseplate and the middle-layer medium baseplate are separated by an air layer; the 3dB mixed electric bridge electric feeding network is placed on the lower surface of the lower-layer medium baseplate; an internal conductor of a coaxial electric feeding unit is connected with an input port of the 3dB electric bridge electric feeding network; and an external conductor of the coaxial electric feeding unit penetrates through the lower-layer medium baseplate and is connected with the earthing unit. According to the invention, not only is the circular polarized radiation realized very well, at the same time, the circular polarized antenna has broader axial ratio beam width within the omnidirectional range, is small in volume, is low in section plane, is light in weight, is simple in structure, and is easy to be conformal.

The invention discloses a single-layered broadband random surface. The random surface comprises a dielectric substrate (2), a windmill metal patch 1 basic unit (1) and a metal floor (3), wherein the windmill metal patch 1 basic unit (1) and the metal floor (3) are respectively coated on the upper surface and lower surface of the dielectric substrate (2); the metal floor (3) is used for preventing electromagnetic wave transmission; the basic unit (1) is formed by using a single-layered double-resonance unit with a randomly distributed size, and composed of a regular square ring located in the center of the unit and a branch-containing square ring located at the periphery of the regular square ring. The random surface disclosed by the invention can be used for effectively reducing the RCS (radar cross-section) of a two-dimensional metal target body in an X waveband; the random surface is simple in manufacturing and easy to operate; the random surface has absolute advantages in comparison with previous multilayer modes, so that the random surface has extremely high application prospect in practice.

This invention relates to double fold tank structure direction pattern to re-form antenna and its array, wherein, the antenna comprises medium base 36, back conductive board 37 an common board 35 with double fold tank and two irradiation arms through co waveguide transmission line with relative switch and detector to realize three status antenna direction scanning through changing detector or switch work status, wherein, the said antenna array uses array unit to distribute onto load curved surface and to keep unit adjacent irradiation direction.

The invention provides a broadband reduction RCS composite material based on crossed bow-tie-shaped AMC (artificial magnetic conductors). The material is characterized in that the composite material is in a three-layer structure, and comprises an AMC patch array, a medium substrate, and a metal floor in sequence from top to bottom, wherein the AMC patch array is arrays respectively formed by two kinds of crossed bow-tie-shaped AMC patches. The shapes of the two kinds of crossed bow-tie-shaped AMC patches are that the center is square, four edges of the square are respectively connected with four trapezoids, the short bottom edges of the trapezoids are connected with the square, the long bottom edges of the four trapezoids are connected with rectangles in sequence, and each patch is a whole integrated structure. The composite material is good in broadband performance. Compared with a metal sheet in the same size, the composite material has RCS reduction of more than -10 dB in the frequency range of 16.2-27.2 GHz, covering the whole K-band. The composite material is small in thickness, and can be conformal easily. The composite material is suitable to manufacture ultralight and ultrathin wave absorbers or radar absorbing materials. The composite material is simple in structure and materials, and is low in processing and manufacturing difficulty.

The invention discloses a three-frequency polarization insensitive electromagnetic energy collection structure unit and a collection surface. The collection structure unit comprises four identical-structure rectangular resonance rings having openings at bottom edges, centers of top edges of the rectangular resonance rings are provided with circular through holes, one side edge of each rectangular resonance ring is connected with a bottom edge of the adjacent rectangular resonance ring, and an end-to-end rectangular resonance ring structure is formed. The collection surface comprises a metal structure layer, a medium substrate, a ground metal layer and a matching resistance array, wherein the metal structure layer comprises more than one collection structure unit, the medium substrate is provided with through holes in matching with the circular through holes respectively, the matching resistance array comprises more than one resistor, each resistor is respectively arranged in one through hole, one end of the resistor is connected with an edge of the circular through hole, and the other end is connected with the metal layer. According to the collection structure unit and the collection surface, a purpose that resonance absorption is generated at three frequency bands is realized, polarization insensitive characteristic is realized, the collection structure unit is applicable to application under the complex electromagnetic environment, the structure is stable and solid, cost is low, and the collection structure unit is suitable for large-scale production.

The invention provides a reconfigurable array antenna based on a transmissive phased electromagnetic surface, comprises a feed source and an array antenna assembly, wherein the feed source is used forproviding a space illumination source for the array antenna assembly and receiving scattered electromagnetic waves of the array antenna assembly, and has the advantages of small feeding loss, fast beam scanning speed, strong array scale expansion, simple structure, low profile, light weight, easy conformal and low cost.

The invention discloses a multi-mode antenna for satellite navigation. The integral multi-mode antenna is divided into a first layer, a second layer, a third layer, a fourth layer and a fifth layer which are sequentially arranged from top to bottom. The first layer is a radiating layer and is of a double-layer short-circuit patch structure, an upper-layer patch of the radiating layer is positioned on the top of a first layer of dielectrics, and a lower-layer patch is positioned at the bottom of the first layer of dielectrics and is connected with the upper-layer patch by a short-circuit arm; the second layer is a dielectric layer for supporting the radiating layer and is positioned between a feed probe and the lower-layer patch; the third layer is an L-shaped probe feed layer and comprises four L-shaped probes, a horizontal portion of the third layer is printed on a dielectric layer, and a perpendicular portion of the third layer penetrates through the dielectric layer to be connected with a secondary feed network; the fourth layer is a secondary dielectric strip-line feed network layer and comprises two broadband 90-degree phase shifters; the fifth layer is a primary dielectric strip-line feed network layer and comprises a broadband 180-degree phase shifter; and the fourth layer is connected with the fifth layer by a metal probe. The antenna has the advantages of good low-elevation axial ratio characteristic and high multi-path interference resistance.

A double-feed-point circular polarization microstrip antenna is characterized by sequentially comprising a metal patch, a dielectric substrate, a grounding plate, a pcb substrate and a mixed electric bridge feed unit from top to bottom, and all the components are integrated in a laminated and stickup mode; the metal patch and the grounding plate are arranged on the upper surface and the lower surface of the dielectric substrate respectively; the mixed electric bridge feed unit comprises a mixed electric bridge feed chip, feed probes, a grounding circuit and an isolated port circuit, and the mixed electric bridge feed chip, the feed probes, the grounding circuit and the isolated port circuit are all arranged on the lower surface of the pcb substrate; two output ports of the mixed electric bridge feed chip are connected with the two feed probes respectively, penetrate through the pcb substrate and the dielectric substrate and are connected with the metal patch on the upper surface of the dielectric substrate. Due to the positions where the two feed probes are located, while retaining phi=0 degree, a radiation waveform generates phase deviation of phi=90 degrees. Circular polarization radiation is achieved well, the bandwidth is large in the omnidirectional range, the antenna is small in size, low in section, light in weight and simple in structure, and the conformal effect is easy to achieve.

The invention discloses a tightly-coupled ultra-wideband low-profile conformal phased array based on resistance ring loading and a development method thereof. A method for enhancing capacitive coupling is provided, a traditional cross-shaped dipole is improved, a resistive frequency selection surface composed of a micro-strip line and a lumped resistor is loaded between an antenna radiation patch and a floor, and the working bandwidth of the antenna is expanded. A feed structure of a power divider and double-balun is applied, so that better matching can be realized, and the profile height of the antenna is reduced. The whole antenna array is subjected to conformal processing, a light and thin dielectric substrate is applied, a thick and heavy wide-angle impedance matching layer is omitted, the antenna array is lighter, and the metal floor is bent at a certain radian so that the antenna array can be conveniently installed on a working platform. In the fL-8fL frequency band, 45-degree scanning active standing waves can be smaller than 3, and the overall height of the antenna is smaller than 0.53 high-frequency wavelengths.

The invention discloses a high performance wide angle domain frequency scanning antenna based on microwave surface plasmon and is different form traditional frequency scanning antennas. According to the frequency scanning antenna, different metal unit structures are etched on a medium surface, electromagnetic waves are coupled to be microwave surface plasmons, and the microwave surface plasmons are radiated in a conduction process. The frequency scanning antenna is advantaged in that the frequency scanning antenna is manufactured through employing the printed circuit board technology, sub-wavelength thickness and a plane structure have properties of wide scanning angle domain, linear scanning angle distribution and strong designability, and the frequency scanning antenna can be applied to engineering practices.

The invention discloses a planar bipolar ultra-broadband phased array antenna based on tight-coupling dipole subunits, and belongs to the technical field of electrocommunication, particularly ultra-broadband phased array antennas. Existing tight-coupling antenna array structures and feeder networks are improved, a grounding hole to the ground is introduced to each monopole of a dipole sub-antenna-unit, therefore, common-mode signal interference which influences the broadband antenna performance is eliminated, a necessary broadband Balun device in the existing tight-coupling antenna feeder networks is removed, and the defects are overcome that existing broadband phased array antennas are high in cost, not easily conformal and complex in manufacturing and cannot achieve the modularized function. The achieved novel planar tight-coupling bipolar ultra-broadband phased array antenna has the advantages of being high in index, broad in frequency band, miniaturized, easily conformal, simple instructure, capable of being assembled in a modularized mode, and can meet the requirements on a new generation of phased array antennas of the development of modern civil mobile communication systemsand military detection radar systems.

The invention discloses a wideband omnidirectional circularly-polarized printed antenna of an L-shaped load improved floor, and belongs to the technical field of omnidirectional circularly-polarized printed antennas. The wideband omnidirectional circularly-polarized printed antenna solves the problems of too narrow impedance bandwidth and axial ratio bandwidth existing in an existing wideband omnidirectional circularly-polarized printed antenna. A dielectric substrate and an upper radiation patch of the printed antenna are circular respectively; a lower floor is a circular metal floor with L-shaped branches on the outer circumference; the upper radiation patch is printed on the upper surface of the dielectric substrate, the lower floor is printed on the lower surface of the dielectric substrate, the centers of circles of the dielectric substrate, the upper radiation patch and the lower floor are coaxial, and coaxial probe feed is adopted; a plurality of drill holes are uniformly formed in the dielectric substrate, the upper radiation patch and the lower floor at corresponding positions along the circumferential direction, and the corresponding drill holes in the dielectric substrate, the upper radiation patch and the lower floor are connected through metal via holes; and five to ten L-shaped branches are uniformly distributed on the outer circumference of the lower floor. The printed antenna is a wideband omnidirectional circularly-polarized printed antenna.