458 results about "Dielectric slab" patented technology

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.

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.

The invention relates to a broadband circular polarization patch antenna which comprises a metal micro-strip patch (1), a metal grounding plate (3) and a dielectric-slab between the metal micro-strip patch (1) and the metal grounding plate (3). The broadband circular polarization patch antenna is characterized in that the metal micro-strip patch (1) comprises a first metal micro-strip patch (101) and a second micro-strip patch (102) substantially mirrored with the first metal micro-strip patch (101). The first metal micro-strip patch (101) is a quarter-wave grounding short circuit patch with resonant frequency which is f1 and the second metal micro-strip patch (102) is a quarter-wave patch with resonant frequency which is f2, wherein f1 is adjacent to f2 and f1 is smaller than f2. According to the antenna provided by the invention, the working broadband can be enhanced greatly, the performance of the antenna is improved and the debugging difficulty is reduced in practical use.

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 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 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.