458 results about "Dielectric slab" patented technology

The present invention provides a dielectric leaky-wave antenna having a single-layer structure which is effective for realizing a highly efficient low-cost antenna in a quasi-millimeter wave zone in particular. This dielectric leaky-wave antenna includes a ground plane, a dielectric slab which is laid on one surface of the ground plane and forms a transmission guide for transmitting an electromagnetic wave from one end side to the other end side between itself and the ground plane along the surface, perturbations which are loaded on the surface of the dielectric slab along the electromagnetic wave transmission direction of the transmission guide at predetermined intervals and leak the electromagnetic wave from the surface of the dielectric slab, and a feed which supplies the electromagnetic wave to one end side of the transmission guide.

The invention discloses a broadband low cross-polarization printed dipole antenna with a parasitic element. The antenna has the advantages of broad frequency band, low cross-polarization, stable directional diagram, small size and simple structure. The antenna adopts a double-layer printed dipole way, and meanwhile, rectangular patches are uploaded on the upper end and at two sides of a dipole arm. The broadband low cross-polarization printed dipole antenna has the basic structure as follows: a metal earth plate, two layers of dielectric slabs, strip line feeding balun, a double-layer printed dipole arm, a rectangular patch arranged on the upper end of the dipole arm, rectangular patches arranged at two sides of the dipole arm and an SMA (Small A Type) joint. The greatest innovation of the broadband low cross-polarization printed dipole antenna is that the ultra broadband character and stable directional diagram character are obtained through uploading the parasitic elements in the manner of the rectangular patches on the upper end and at two sides of the double-layer printed dipole arm, 75% of bandwidth can be achieved under the condition that the standing-wave ratio is smaller than 1.5, and meanwhile, the broadband low cross-polarization printed dipole antenna has a stable directional diagram in the bandwidth, low cross-polarization and grain up to 6.1-9.3dBi. The size of the antenna is reasonably changed, i.e., other concrete embodiments of the invention can be formed.

The invention provides a phased-array antenna based on dynamic-regulating artificial electromagnetic structural materials. The phased-array antenna comprises a horn feed source and multiple layers of the dynamic-regulating artificial electromagnetic structural materials covering the upper portion of the horn feed source. Each layer of the materials is formed in the modes that metal patches with annular gaps distributed periodically are printed on the front of a dielectric slab, variable capacitance diodes are embedded in vertical centers of the annular gaps, gap lines used for isolating direct currents are etched between the annular gaps in different columns, and metal leads are printed on the back of the dielectric slab and via holes are metallized so that direct-current voltage can be provided for the metal patches in the annular gaps in different rows. Capacitance of the variable capacitance diodes between different rows or different columns is adjusted through controlling of a direct-current voltage source, so that radiation phases of regions in adjacent rows or adjacent columns gradually increase or decrease, the phase different value is dynamically adjusted, and dynamic scanning of antenna beams can be achieved. The phased-array antenna has the advantages of being simple in structure, convenient to power up, low in insertion loss, low in cost and the like and can achieve two-dimensional dynamic scanning of an E face and an H face.

The invention discloses a broadband wide beam dual-polarization dipole antenna, belonging to a dipole antenna. The broadband wide beam dual-polarization dipole antenna comprises an antenna cover plate, a reflection plate and a first antenna dielectric slab and a second antenna dielectric slab in cross fixing, wherein the first antenna dielectric slab and the second antenna dielectric slab are mounted on the reflection plate; the antenna cover plate is supported by at least three support columns and placed above the reflection plate, the first antenna dielectric slab and the second antenna dielectric slab; and toothed rails are arranged at the outer parts of the first antenna dielectric plate and the second antenna dielectric plate and also mounted on the reflection plate. By adding the toothed rails around the dipole antenna dielectric slabs, the antenna operation is effectively expanded, and the width of the wide beam is increased; the antenna unit covers the frequency range of 1,710-2,690MHz when the standing wave is less than 1.4, and is directly fed through a microstrip feeder and a through hole with a metalized edge in the reflection plate; and moreover, the processing is easy, the integration of an antenna and a feed network after array formation is facilitated, and the application range is broad.

A slab laser includes two elongated electrodes arranged spaced apart and face-to-face. Either one or two slabs of a solid dielectric material extend along the length of the electrodes between the electrodes. A discharge gap is formed either between one of the electrodes and one dielectric slab, or between two dielectric slabs. The discharge gap is filled with lasing gas. A pair of mirrors is configured and arranged to define a laser resonator extending through the gap. An RF potential is applied across the electrodes creating a gas discharge in the gap, and causing laser radiation to circulate in the resonator. Inserting dielectric material between the electrodes increases the resistance-capacitance (RC) time constant of the discharge structure compared with the RC time constant in the absence of dielectric material. This hinders the formation of arcs in the discharge, which enables the laser to operate with higher excitation power, higher lasing gas pressure, and higher output power than would be possible without the dielectric inserts.

The invention relates to a microstrip dual-mode filter of nesting ring-structured parallel feeder lines, comprising a front part metal microstrip line, a back part metal coating, an interlayer dielectric slab and an input / output port. Structure of the metal microstrip line consists of a multiplex nesting ring-structured dual-mode resonator, an input feeder line and an output feeder line of which are arranged on the same horizontal line; the input feeder line and the output feeder line are gap-coupled with an internal resonator by a pair of U-shaped coupling arms; and a perturbation which is formed by the linewidth difference Delta m between an inter loop line and an outer loop line and the small patch on a perpendicular symmetric line controls degenerate mode and adjusts two output zero positions. Compared with the traditional microstrip dual-mode filter of parallel feeder lines, the invention has the advantages of less size and better frequency selectivity, and can flexibly adjust the output performance curve zero position of the filter. The invention can be used for designing a narrowband band-pass filter of a wireless communication system and be applicable for filter miniaturization requirement of the wireless communication system.

The invention discloses a printed Yagi antenna of vibrator loading type balance microstrip line feed, relating to a printed Yagi antenna, in particular to a printed Yagi antenna of vibrator loading type balance microstrip line feed. The invention aims to solve the problem that the existing printed Yagi antenna feed structure has a very large size. In the invention, a first symmetric vibrator and a second symmetric vibrator are printed between a director and a reflector in a straight manner; the reflector is connected with a feed part in the middle of the lower edge of a dielectric slab; one side of the first symmetric vibrator close to the second symmetric vibrator is connected with the reflector through a feeder; a dead-end feeder load is printed on the back of the dielectric slab and connected with the feed part printed in the middle of the lower edge of the dielectric slab through a feeder; the second symmetric vibrator is connected with the feed through a metalized feed via hole by a balance microstrip line on the back of the dielectric slab; and the diameter of the metalized feed via hole is 1mm. The printed Yagi antenna disclosed by the invention is applied to the field of radio technology.

The invention relates to a wide band one-layer microstrip patch antenna, which solves the problem of narrow impedance width in the currently common microstrip antenna. The microstrip patch of the antenna is a one-layer microstrip patch; one end of a stair-stepping coplane microstrip line with two widths is inserted in the patch antenna by the open slot on a convex microstrip patch, and the other end of a feeding microstrip line is positioned at the edge of a microstrip dielectric-slab; a concave metal carinal cavity is arranged at the back surface of the microstrip dielectric-slab excluding the position corresponding to the microstrip patch and in the middle of structural mounting plate. The wide band one-layer microstrip patch antenna can form a large microstrip patch antenna array easily, which is in favor of impedance matching of the antenna, the subnetwork design for microstrip work, the weight reduction of the antenna and the bandwidth widening of the antenna; the wide band one-layer microstrip patch antenna of the invention has the advantages of simple and compact structure and small cross section, which improves the telecommunication performance and reduces the whole weightof the antenna array.

The invention discloses a single-fed dual-bandwidth wave beam circular polarization antenna which comprises a metal floor (1), two layers of dielectric slabs (2), a radiation paster (3), a coaxial feed unit (4) and a metal bracket (5), wherein the radiation paster (3) comprises a coupling radiation paster (3a), from which a triangular corner is cut, and a main radiation paster (3b); complementary opening resonance rings (6) are etched on the main radiation paster (3b) and embedded with one another; the central points of the complementary opening resonance rings (6) are overlapped, and the opening directions are opposite; the main radiation paster (3b) is printed on the upper surfaces of the dielectric slabs (2); the coupling radiation paster (3a) is printed on the middle plane of the two layers of dielectric slabs (2); the coaxial feed unit (4) is arranged in the two layers of dielectric slabs (2) in a deviation manner; and the metal bracket (5) is symmetrically arranged on the four corners of the two layers of dielectric slabs (2). The dual-bandwidth circular polarization antenna with the characteristics of wide wave beam, high gain and low coupling is realized and can be applied to satellite communication.

The invention discloses a novel broadband printed dipole antenna with a branch wire integrated with a feed balun. The novel broadband printed dipole antenna comprises an SMA (Shape Memory Alloy) joint, a dielectric-slab, a radiating element and a microstrip line feed integrated balun, wherein the radiating element is provided with a slotting seam; dual radiation arms are formed on both sides of the slotting seam; the microstrip line feed integrated balun is provided with a branch wire; the branch wire is equivalent to a series resistor, and is used for improving the matched impedance. According to the novel broadband printed dipole antenna, the VSWR (Voltage Standing Wave Ratio) is less than or equal to 1.5, and the relative bandwidth is up to 58.7 percent (1.65-3.0GHz); compared with other bandwidth extension technologies (such as a parasitic patch increasing technology), the novel broadband printed dipole antenna has the advantages that design is made on the basis of not changing the original size of the antenna, so that the bandwidth of the antenna is improved, other performance of the antenna (such as gain and cross polarization level) is not influenced, and the occupied space is reduced; the novel broadband printed dipole antenna has the advantages of simple structure, convenience, practicability, wide adaptability and the like.

The invention discloses a method of room air purification with low temperature plasma generated by dielectric resistance discharging. The harmful gas of air can be wiped off by dielectric resistance discharging plasma which is in magnetic field: the needle plate electrode is the reaction electrode, the dielectric resistance discharging can be realized by inserting a dielectric-slab which is 1mm-5mm in thickness at the side of the plate electrode, the distance of the needle electrode is 6mm-30mm, the nanosecond frontal high-voltage narrow pulse power supply is applied to the two ends of the needle plate electrode, the voltage is 10kv-60kv, the permanent magnet is mounted on the two ends of the electrode; The harmful gas of air can be wiped off by pulse discharging plasma which is in magnetic field. At the base of parallel magnetic field, the harmful gas can be wiped off by the low temperature plasma generated by the nanosecond frontal pulse dielectric resistance discharging in the invention, so the purification efficiency is improved greatly.

The invention discloses an antenna for reducing a radar scattering cross section, aiming to solve the problem of large radar scattering cross section of the traditional microstrip antenna. The antenna comprises a dielectric slab (1), a microstrip radiating unit (2) and an earth plate (3), wherein the microstrip radiating unit is arranged at the upper surface of the dielectric slab, and the earth plate is arranged at the lower surface of the dielectric slab; both sides of the microstrip radiating unit are provided with a high impedance surface array (4) respectively; each high impedance surface array is formed by arranging a plurality of metal chips into a rectangle, a gap is arranged between the adjacent metal chips to form a capacitor C; the center of each metal chip is provided with a metal via hole which penetrates through the dielectric slab; a current path connected by the via holes can form an inductor L, and the capacitor and the inductor form an LC resonant circuit; the frequency of the resonant circuit can be adjusted to be coincident with the working frequency of the antenna, thus realizing scattered field compensation of the high impedance surface array and the antenna. The invention has stable performance of reducing radar scattering cross section within and outside the frequency band of the antenna, and also has no effect on the size, weight and cost of the antenna.

The invention relates to a broadband dual-polarized mobile base station antenna unit equipped with metallic pillars and belongs to the technical field of mobile communication base station design and manufacture. The antenna unit successively comprises, from top to bottom, a feed structure, a dielectric slab, a butterfly-shaped radiation structure, short metallic pillars, a coaxial line, plastic support column, and a metallic reflecting plate. The feed structure and the butterfly-shaped radiation structure are arranged on the upper surface and the lower surface of the dielectric slab in the same placed direction, respectively. The short metallic pillars cling to the butterfly-shaped radiation structure. The butterfly-shaped radiation structure is fixed to the metallic reflecting plate through the four plastic support columns. The coaxial line passes through the metallic reflecting plate. The inner core of the coaxial line is connected with the feed structure and the outer core of the coaxial line is connected with the butterfly-shaped radiation structure. The antenna unit has characteristics of a broad band, high isolation, low cross polarization, compact structure, and low cost, complies with the development tendency of current base station antennas, and has good practical value.

An omnidirectional photonic crystal includes a substrate and a periodic dielectric structure that is formed on the substrate and that includes a stack of dielectric units. Each of the dielectric units includes upper and lower dielectric slabs and at least one intermediate dielectric slab sandwiched between the upper and lower dielectric slabs. The periodic dielectric structure introduces an omnidirectional photonic band gap in a given frequency range. The periodic dielectric structure defines a lattice constant a that is equal to the total thickness of each of the dielectric units. The intermediate dielectric slab has a thickness d, the upper dielectric slab has a thickness equal to x(a−d), and the lower dielectric slab has a thickness equal to (1−x) (a−d), where x is a positive number ranging from 0.2 to 0.8.

A substrate structure, and method of forming the structure, are provided. The structure, which may be used for a CMOS imager device, is provided with a buried dielectric structure. Recesses are formed on a semiconductor substrate, e.g., silicon, and a dielectric material is used to fill the recesses. A layer of semiconductor material, e.g., silicon, is then formed over the surface of the substrate material and dielectric-filled trenches.

The invention discloses an ultra-wideband (UWB) filter with band-notched characteristics. The UWB filter comprises a metal microstrip line at a front face part, a metal coating at a rear face part and a dielectric slab at a middle layer, wherein, the metal microstrip line is of a linear cascaded microstrip line structure which is formed by alternately connecting comb coupled microstrip lines with a quarter of wavelength and a microstrip line with half wavelength; the microstrip line with half wavelength is provided with microstrip slits; uniform transmission parts on the outer ends of the two comb coupled microstrip lines are respectively and electrically connected with input and output interfaces and two short-circuit stubs with a quarter of wavelength; and free ends of the short-circuit stubs with a quarter of wavelength are electrically connected with the metal coating at the rear face part. The UWB filter disclosed by the invention has the advantages of good band-notched characteristics, high coupling coefficient, small volume, easy machining process, steep sideband characteristics and good frequency selectivity, and a passband is internally provided with a steep trap with the relative width of more than 125%, thus meeting the requirement for miniaturization.

An antenna element and balun are described. The antenna includes a plurality of droopy bowtie antenna elements disposed on dielectric block and a feed point. The balun includes a central member having dielectric slabs symmetrically disposed on external surfaces thereof. At least one end of the balun is provided having a shape such that conductors on the dielectric slabs of the balun can be coupled to the the droopy bowtie antenna elements.

An array of electrically conductive waveguides is made by a method including defining slots in broad surfaces of planar dielectric slabs. The surfaces of the slabs, including slots, are metallized. The broad sides of the slabs are juxtaposed, with the slots registered with the planar surfaces of another slab, to form one or more closed waveguides. Heat pipes are made by defining apertures within the dielectric slabs, and introducing wick material into the apertures.

The invention discloses a beam controllable Vivaldi antenna. The antenna comprises a dielectric substrate and a copper foil which covers the dielectric substrate and comprises a horn-shaped opening. A cylindrical lens is arranged at the horn-shaped opening. The lens comprises two parts along a longitudinal direction. The refractive index of the first part of the lens is 1-1.1. The refractive index of the second part of the lens is shown as an equation in the specification, wherein x represents the position of a horizontal ordinate by taking the circle centre of the lens as the origin of a coordinate axis; and y represents the position of a vertical ordinate by taking the circle centre of the lens as the origin of the coordinate axis. After translating for 14 mm along the horizontal ordinate direction of the coordinate axis, the circle centre of the lens and a space in which the original lens is located form an interface which is a separating surface of the first part and the second part. The antenna disclosed by the invention has the advantages of simplicity for manufacture and convenience for processing. The traditional beam control is generally realized by using a plurality of antennas to form a phase array, thus, the complexity of a system is increased and the manufacture process is fussy, but, the refractive index of an equivalent medium can be adjusted and controlled conveniently by utilizing a perforated dielectric slab, therefore, the requirements of the lens can be satisfied.

A plane wave antenna including: a horn antenna; a waveguide at least partially inside the horn antenna, wherein the waveguide includes: a central dielectric slab increasing in width toward the horn antenna and with a first dielectric constant, an upper slab above the central dielectric slab with a second dielectric constant, and a lower slab below the central dielectric slab with the second dielectric constant; wherein the central dielectric slab has a substantially constant thickness less than a quarter of a wavelength at a highest frequency of operation of the plane wave antenna.

The invention discloses a high-isolation dual-polarization E-type microstrip antenna with a spurious wafer. The antenna has the advantages of high isolation, low cross polarization, small size and simple structure. The antenna adopts a double-layer E-type patch form; E-type patches are respectively printed on both upper and lower surfaces of an upper dielectric slab; slotting directions of the E-type patches are orthogonal; and two linear polarizations in the direction of plus and minus 45 degrees are respectively generated by coaxial probe feed. The high-isolation dual-polarization E-type microstrip antenna has the biggest innovations that two E-type patches are respectively printed on both the surfaces of the same dielectric slab; a conventional single-polarization E-type patch antenna is expanded to a dual-polarization E-type patch antenne; and the high isolation and the low cross polarization characteristic are obtained. Under the condition that the return loss is lower than minus 15dB, the bandwidth of 7.7 percent can be reached, the isolation is lower than minus 30dB, a directional diagram is stable, the cross polarization is good, and the gain is in the range of 6.8dBi-7.4dBi. The high-isolation dual-polarization E-type microstrip antenna can be applied to a micro mobile base station.

The invention provides a high output voltage micro-strip difference rectification antenna based on a WIFI frequency band. The micro-strip difference rectification antenna based on the WIFI frequency band comprises a micro-strip receiving antenna and a micro-strip difference rectification circuit, wherein the micro-strip receiving antenna and the micro-strip difference rectification circuit are manufactured on a metal layer on the upper layer of a two-sided copper-coated dielectric substrate and connected through an SMA hermaphrodite connector. The micro-strip difference rectification antenna based on the WIFI frequency band adopts a disc-shaped slotting technology, so that the antenna has high direction gains, a wide work frequency band and low loss. A micro-strip line feed method is adopted, a multi-unit array can be formed easily, and the micro-strip difference rectification antenna based on the WIFI frequency band can be applied to large-power occasions. The positive and negative electrodes of a rectification diode are arranged on one side of a dielectric slab and are connected in the rectification circuit in series, and platemaking is easy; the rectification circuit is of a symmetrical structure, the size of the circuit is reduced, the complexity and machining difficulty of the system are reduced, and the integration degree is improved; the rectification circuit adopts a differential voltage output mode, the whole design is not provided with via holes, the parasitic parameter is small, the system performance is good, and output voltage is high.

The invention discloses a broadband broad-angle circular polarization overlapping microstrip antenna which is low in profile, wide in axial ratio and impedance bandwidth, and good in wide-angle axial ratio performance. According to the technical scheme, an upper-layer rectangular microstrip metal patch (9) serving as a parasitic radiator is attached under a covering layer dielectric slab (1), a lower-layer rectangular microstrip metal microstrip patch (8) serving as a driving radiator is attached to the upper portion of a bottom-layer dielectric slab (5), the upper-layer rectangular microstrip metal patch works at a high-frequency end in a resonance mode, and the lower-layer rectangular microstrip metal microstrip patch works at a low-frequency end in a resonance mode; a cavity with the dielectric slabs as walls is formed in the central area of a rectangular box body, the cavity area is filled with a dielectric body of which the dielectric constant is similar to that of the air, a feed probe (10) is fixedly connected with the lower-layer rectangular microstrip metal microstrip patch through a metallized via hole, the metallized via hole penetrates through the bottom-layer dielectric slab, and the diameter of the metallized via hole is larger than the feed probe. By means of the broadband broad-angle circular polarization overlapping microstrip antenna, a wider work bandwidth can be achieved.

The invention discloses a horizontal polarization omnidirectional antenna which comprises a dielectric slab, a feed network, a floor slab and a plurality of printed dipoles. The feed network is positioned above the dielectric slab and comprises a plurality of feed lines, the floor slab and the printed dipoles are positioned below the dielectric slab, each printed dipole is connected with the floor slab and provided with gaps, and the feed lines are connected with the gaps in a coupled and one-to-one corresponding manner and short-circuited with the printed dipoles in a one-to-one corresponding manner. The horizontal polarization omnidirectional antenna has the advantages that the horizontal polarization omnidirectional antenna is fine in machining consistency and high in stability, the polarization isolation degree between the horizontal polarization omnidirectional antenna and a vertical polarization omnidirectional antenna is high and the like.

The invention discloses super-thin broadband wave-absorbing metamaterial. The super-thin broadband wave-absorbing metamaterial comprises at least two layers of dielectric slabs which are laminated together. In the laminated dielectric slabs, a matching layer covers the upper surface of the dielectric slab at the top layer, a metal floor layer covers the lower surface of the dielectric slab at the bottom layer, and a non-closed annular metal layer further covers the upper surface of the dielectric slab at each layer. The non-closed annular metal layers located on the different dielectric slabs are same in shapes and mutually different in terms of sizes. The non-closed annular metal layers are distributed according to the pyramid structure, wherein the non-closed annular metal layer with the largest size is located on the dielectric slab at the bottom layer. According to the wave-absorbing metamaterial, due to the fact that electromagnetic parameters of each layer of structure are changed, phase positions of a reflected wave and a refracted wave are changed. Therefore, a final reflected wave and an incident wave are counteracted, so that the same effect that electromagnetic waves are absorbed by the metamaterial is achieved. Due to the fact that a metamaterial structure composed of the three dielectric slabs, three metal rings and the metal floor is adopted, the broadband wave-absorbing metamaterial is super-thin.

The invention relates to a broadband high-efficiency and high-directionality electrically small antenna, and belongs to the technical field of antennae. The antenna comprises an exciting unit, an upper parasitic unit, a lower parasitic unit, two thin cylindrical dielectric slabs and a coaxial feeder. The radii of the two thin cylindrical dielectric slabs are the same, the centers of the two thin cylindrical dielectric slabs are aligned, and the two thin cylindrical dielectric slabs are parallel in the vertical direction. The exciting unit and the upper parasitic unit are arranged on the bottom surface and the top surface of the upper thin cylindrical dielectric slab respectively, and the lower parasitic unit is arranged on the top surface of the lower thin cylindrical dielectric slab. An inner conductor and an outer conductor of the coaxial feeder are connected with two metal sheets of the existing unit respectively, and the feed end of the coaxial feeder penetrates through the lower thin cylindrical dielectric slab, extends to the lower side of the lower thin cylindrical dielectric slab by a certain distance and is connected with a 50 omega signal source. The antenna is simple in design, compact in structure and easy to manufacture and can be applied to broadband wireless communication systems with the operating frequency being 1 GHz or so.

The invention discloses a composite wave-absorbing material with wide frequency bands. The wave-absorbing material comprises a floor slab, dielectric slab, a frequency selection surface and a matrix wave-absorbing material layer, wherein the floor slab is arranged at the lower surface of the dielectric slab; the frequency selection surface is arranged on the upper surface of the dielectric slab; the matrix wave-absorbing material layer is applied onto the frequency selection surface; the frequency selection surface is provided with a plurality of passive resonance units; each passive resonance unit is in a Jerusalem cross hole-shaped structure; the plurality of passive resonance units are cyclically arranged to form the frequency selection surface with holes, and an RLC (Radio Link Control) parallel circuit is formed. The composite wave-absorbing material can achieve the reduction of radar cross sections within a wide frequency band range, and has the advantages of being simple in structure, excellent in stability and easy to realize.

The present invention provides a dielectric leaky-wave antenna having a single-layer structure which is effective for realizing a highly efficient low-cost antenna in a quasi-millimeter wave zone in particular. This dielectric leaky-wave antenna includes a ground plane, a dielectric slab which is laid on one surface of the ground plane and forms a transmission guide for transmitting an electromagnetic wave from one end side to the other end side between itself and the ground plane along the surface, perturbations which are loaded on the surface of the dielectric slab along the electromagnetic wave transmission direction of the transmission guide at predetermined intervals and leak the electromagnetic wave from the surface of the dielectric slab, and a feed which supplies the electromagnetic wave to one end side of the transmission guide.