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141 results about "Zigzag line" patented technology

Zigzag slow-wave line of double ridged waveguide

A zigzag slow-wave line of double ridged waveguide belongs to the technical field of microwave vacuum electron and relates to a traveling-wave tube amplifier. A slow-wave structure is formed by periodically bending the double ridged waveguide (4) along the electric field to form a right-angled zigzag line or a U-shaped zigzag line; circular through holes are arranged at the positions along the mean axis symmetric line (2) of the slow-wave structure on the waveguide wall; and the slow-wave lines are connected by the metal tubes (3) with the aperture the same with that of the circular through holes between two circular through holes of the right-angled groove or U-shaped groove in each zigzag periodic structure of the slow-wave structure to form an electron stream channel. Compared with conventional zigzag slow-wave line of waveguide, the slow-wave line has lower cut-off frequency, wider pass band range and flatter dispersion characteristics. In addition, in the event that the dispersion characteristics are approximate, the zigzag slow-wave line of double ridged waveguide has smaller cross-sectional dimension to well ensure the transfer characteristics of electron stream in traveling wave tube under the action of the same focusing magnetic field, so as to improve the integral output power and grain of the traveling wave tube.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Combined ultra wideband Vivaldi notch/meander line loaded antenna

The combination of a Vivaldi slot and a meander line loaded antenna is provided which exhibits an ultra wideband characteristic with the Vivaldi notch expanding the high end and with the meander line loaded antenna portion reducing the low frequency cut-off. When these antennas are arrayed, this array exhibits a single lobe and an ultra wide 100:1 bandwidth. The Vivaldi notch portion of the antenna accommodates the higher frequencies, whereas the meander line loaded antenna portion of the antenna accommodates the lower frequencies, there being a smooth transition region between the Vivaldi and meander line portions of the antenna and no discontinuity. In one embodiment, the antenna is made to work between 50 MHz and 1500 MHz with a VSWR less than 3:1. The Vivaldi notch meander line combination assures that for an array one does not have a separation of the elements more than a 0.5 wavelength at the highest frequency, thus to eliminate the possibility of creating grating lobes. As one goes down in frequency to {fraction (1 / 50)} of the highest frequency, the 0.5 wavelength is divided by 50. This means that antenna element spacing is 0.01 wavelength at the low frequency end, clearly below that separation which would cause grating lobes. In short, the generation of grating lobes at the high end is prevented because the antenna element spacing is less than a 0.5 wavelength, with the situation improving as one goes down in frequency.
Owner:BAE SYST INFORMATION ELECTRONICS INTEGRATION

Meander line antenna coupler and shielded meander line

InactiveUS20050225496A1Less ohmic lossEliminates down firingResonant long antennasRadiating elements structural formsResonanceEngineering
A switched meander line structure is substituted for a lumped element coupler (10) for an order of magnitude increase in gain due to the use of the switched meander line architecture. The use of the meander line (20) with relatively wide and thick folded legs markedly decreases I2R losses over wire inductors whose wire diameters at one-tenth of an inch contribute significantly to I2R losses. Additionally, placing solid state switches to short out various sections of a multi-leg meander line at high impedance nodes reduces I2R losses across the switching elements in the coupler. It has been found that, regardless of the impedance of the antenna, this impedance may be matched by switching in and out various sections of a folded multileg meander line due to the fact that the square of the sum of the capacitive reactances of the meander line decreases with frequency in synchronism with the unloaded Q of the meander line, thus to provide the ability to maintain a good match over frequency as the meander line is tuned to achieve resonance by shorting out combinations of sections of the meander line. The result of the substitution of the meander line architecture for the lumped element coupler is the reduction of losses associated with the use of wire inductors and losses due to the interposition of solid state switches at high-current nodes.
Owner:BAE SYST INFORMATION & ELECTRONICS SYST INTERGRATION INC

Low temperature cofired ceramic antenna and very high frequency RF identification tag antenna formed of the same

The invention relates to a low temperature co-firing ceramic antenna and a VHF(very high frequency) radio frequency identifying label antenna formed by the low temperature co-firing ceramic antenna. The antenna adopts the low temperature co-firing ceramic as a base plate and adopts metal wire to be printed on the low temperature co-firing ceramic base plate so as to from a needed shape. The VHF radio frequency identifying label antenna formed by the low temperature co-firing ceramic antenna comprises an L-shaped grounding metal wire which is printed on the low temperature co-firing ceramic base plate, a spiral micro strip eradiating unit which is connected with the L-shaped grounding metal wire, and a zigzag line shape feed-in metal wire which is connected at the connecting point of the L shape grounding metal wire and the spiral micro strip eradiating unit. The other end of the zigzag line shape feed in metal wire is the feeding line inputting end; the under layer of the L-shaped grounding metal wire, the spiral micro strip eradiating unit and the zigzag line shape feed in metal wire is provided with an under layer grounding metal plate which adopts the low temperature co-firing ceramic as a base plate; the other end of the L shape grounding metal wire is connected with the under layer grounding metal plate through a through hole between two layers. The present invention reduces the area of the antenna and reduces the wastage, which can realize the whole integration of the RFID label.
Owner:TIANJIN UNIV

Multi-layer broadband metamaterial wave absorber based on multimode resistor and design method of multi-layer broadband metamaterial wave absorber

ActiveCN112615165AExcellent broadband absorbing performanceAngle-insensitiveAntennasDielectric plateBroadband
The invention belongs to the technical field of metamaterial wave absorption, and particularly relates to a multi-layer broadband metamaterial wave absorber based on a multimode resistor and a design method of the multi-layer broadband metamaterial wave absorber. The metamaterial wave absorber is an array formed by periodically extending wave absorber units along x and y directions, and the period is p; each wave absorber unit is formed by stacking a bottom metal floor and three layers of wave absorbing layer-dielectric plates; the wave absorbing layer is an ITO resistive film printed on the PET film; the top layer of each wave absorber unit is of an annular zigzag line ITO structure, the middle layer of each wave absorber unit is of a square patch structure, and the bottom layer of each wave absorber unit is of a symmetrical four-trapezoid combined patch structure; two adjacent layers of PET films are separated by a dielectric plate; the bottoms of the units are metal floors; and the unit structures are in central symmetry; The structural parameters of the wave absorber unit are determined through optimization design, so that the metamaterial wave absorber shows excellent broadband wave absorbing performance under excitation of TE and TM polarized waves, and has angle insensitivity under TM polarization; the thickness is small, the structure is simple, and machining is convenient.
Owner:AIR FORCE UNIV PLA

Complex three-dimensional multi-layer structure and manufacturing method thereof

The present invention relates to a 3-dimensional complex multilayer structure. The 3-dimensional complex multilayer structure includes a first pattern and a second pattern having different thicknesses formed on one or both surfaces of a plate. The first pattern is selected from the group consisting of parallel lines, parallel curves, parallel zigzag lines, and combinations thereof which do not meet each other. The second pattern is not parallel to the first pattern and is selected from the group consisting of parallel lines, parallel curves, parallel zigzag lines, and combinations thereof which do not meet each other. The interfaces between the first pattern and the second pattern form figures selected from the group consisting of polygons, circles, ellipses, and combinations thereof. The figures are repetitively formed on one or both surfaces of the plate. The 3-dimensional complex multilayer structure includes different complex patterns, whereas a conventional device has a kind of simple pattern. The 3-dimensional complex multilayer structure of the present invention can be manufactured by a simple process. Therefore, the 3-dimensional complex multilayer structure of the present invention can find application in various fields, including optical components for displays (e.g., light guide plates, diffusion plates, prisms, and color filters), next generation displays and display devices (e.g., TFTs, OTFTs, oxide TFTs, flexible displays, and transparent displays), next generation 3-dimensional semiconductors, dry adhesion based on the use of fine ciliary structures, micro/nano piezoelectric devices, lighting optical components, and biocell/virus research using micropatterns.
Owner:MINUTA TECH CO LTD

Radio frequency identification antenna

The invention relates to an antenna commonly used in a microwave communication system, in particular to an antenna suitable for applying in radio frequency identification. The radio frequency identification antenna comprises a radio frequency tag chip, a basal body and a metal pattern coated on the basal body, wherein the basal body adopts a ceramic chip of which the dielectric constant is 5-150;the metal pattern is composed of a radiation part, a feeder line matching part, a resonance matching part, a side surface connection part and an anti-metal part, wherein the feeder line matching partis a zigzag line, one end is connected with the radiation part, and the other end is connected with the radio frequency tag chip; the resonance matching part is positioned on one end part of the basal body facade, one end is connected with the radio frequency tag chip, and the other end is connected with the side surface connection part; the side surface connection part is positioned on the side surface of the basal body, and the side surface connection part is connected with the anti-metal part. In the invention, the tag antenna matched with the tag chip can achieve 3dBi linear polarization gain and has further identification space if compared with the anti-metal tag with the same size. The antenna of the invention is suitable for frequency range of 800MHz-1GHz.
Owner:JIAXING GLEAD ELECTRONICS CO LTD
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