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86 results about "Free space wavelength" patented technology
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Multiple-element antenna array for communication network
ActiveUS20070205955A1Mitigating signal pattern asymmetryReduce in quantitySimultaneous aerial operationsRadiating elements structural formsRadio frequencyLinearity
An antenna array includes four closely spaced, linearly arranged antenna columns. At least two of the columns, e.g., the center two columns, are dual-polarized. Spacing between neighboring columns is about ½λ, where λ is the free space wavelength at the network carrier frequency. Each column includes a first vertical linear array of radiating elements or groups of elements (sub-arrays) connected to a port. The dual-polarized columns each further include a second linear array of radiating elements oriented at a different polarization than the first array. (For example, horizontal / vertical or slant 45°.) Array ports are connected with four RF feed cables using duplexers in such a way so as to provide two different antenna configurations for forward link and reverse link frequencies, namely, a four-column closely spaced beam-forming array at the forward link and a two-column dual-polarized array at the reverse link for 4-branch diversity reception.
Owner:ALCATEL-LUCENT USA INC
Low frequency enhanced frequency selective surface technology and applications
ActiveUS7071889B2Reduce physical sizeHigh surfaceSimultaneous aerial operationsRadiating elements structural formsWave structureCapacitance
DC inductive FSS technology is a printed slow wave structure usable for reduced size resonators in antenna and filter applications of wireless applications. It is a dispersive surface defined in terms of its parallel LC equivalent circuit that enhances the inductance and capacitance of the equivalent circuit to obtain a pole frequency as low as 300 MHz. The effective sheet impedance model has a resonant pole whose free-space wavelength can be greater than 10 times the FSS period. A conductor-backed DCL FSS can create a DC inductive artificial magnetic conductor (DCL AMC), high-impedance surface with resonant frequencies as low as 2 GHz. Lorentz poles introduced into the DCL FSS create multi-resonant DCL AMCs. Antennas fabricated from DCL FSS materials include single-band elements such as a bent-wire monopole on the DCL AMC and multi-band (dual and triple) shorted patches, similar to PIFAs with the patch / lid being a DCL FSS.
Owner:OAE TECH INC
Sea surface antenna
InactiveUS7123200B1Antenna adaptation in movable bodiesSubaqueous/subterranean adaptionCapacitanceMetallic materials
A sea surface antenna comprises a cylindrical tube of metallic material 13 on a dielectric former. The tube has a longitudinal slot shorted at each end and coupled at its midpoint to a coaxial feed. The slot is bridged by two groups of capacitances each group being distributed along a respective half of the slot. The length of the antenna is less than 0.25 λ and the diameter of the antenna is less than 0.02 λ, where λ is the free space wavelength at the operating frequency. The antenna is dimensioned so as to operate in an evanescent mode at a resonant frequency less than the cut-off frequency.
Owner:NORTEL NETWORKS LTD
Compact waveguide antenna array and feed
A compact waveguide antenna array feed system provides antenna element ports spaced along an array face by less than one free-space wavelength in at least one dimension, while retaining a thickness in a direction perpendicular to the array face of less than one and one-half free-space wavelength.
Owner:L3 TECH INC
Novel wavelength division multiplexing demultiplexing optical assembly applied to high-speed parallel long-distance transmission
InactiveCN102684794AHighlight substantive featuresSignificant progressWavelength-division multiplex systemsCoupling light guidesOptical isolatorPrism
Owner:INNOLIGHT TECHNOLOGY (SUZHOU) LTD
Interrogator and goods management system adopting the same
InactiveUS7164380B2Wide range of fieldsIncrease electromagnetic energyAntenna supports/mountingsCo-operative working arrangementsElectrical conductorBody identification
An interrogator with an antenna that allows information exchanges with multiple transponders in a shorter distance of communication, by securing an intensified and uniform electromagnetic energy concentrated on areas near antenna elements. The interrogator is furnished with a sleeve antenna that includes a monopole conductor of ¼ wavelength (free space wavelength) continuously connected to a core wire of a coaxial cable on one end thereof, and a feed point on the other end, in which the sleeve antenna is grounded at the feed point. The interrogator has a plurality of the transponders arrayed near the antenna, and a plurality of the antennas selected by RF signal selectors. The interrogator antenna allows movable body identification such as in a goods management system for identifying multiply arrayed goods.
Owner:HITACHI LTD
Antenna device
ActiveUS20130033404A1Prevent leakageLower performance requirementsWaveguide hornsLinear waveguide fed arraysAntenna elementOperating frequency
An antenna device includes antennas, each of which includes antenna elements arranged in a longitudinal direction, arranged side by side in a transverse direction intersecting the longitudinal direction, wherein an interval between the antennas arranged side by side in the transverse direction is approximately 2λ. where λ is a free space wavelength corresponding to an operating frequency, and each of the antenna elements includes a horn formed therein.
Owner:HONDA ELESYS CO LTD
Narrow reactive edge treatments and method for fabrication
InactiveUS6933895B2Improve isolationNone is suitable for purposeSimultaneous aerial operationsAntenna supports/mountingsUltrasound attenuationManufacturing technology
An electromagnetic bandgap material is electrically attached to an edge, and enables high isolation between antennas due to the attenuation of surface waves. The disclosed embodiments further provide narrow reactive edge treatments in the form of artificial magnetic conductors (AMCs) whose physical width is less than 1 / 10 of a free space wavelength for the frequency of surface currents intended to be suppressed. These embodiments still further provide several AMCs suitable for this purpose, along with several exemplary manufacturing techniques for the AMCs.
Owner:E TENNA CORP
Folded cavity-backed slot antenna
InactiveUS6304226B1Antenna adaptation in movable bodiesRadiating element housingsCoaxial cableAntenna element
An antenna that includes a housing having a plurality of walls forming an enclosure, a slot formed in a first wall of the housing, and, a folded cavity formed in a second wall of the housing opposite the first wall. The folded cavity is preferably a compound cavity that includes a first cavity portion and a second cavity portion joined around their entire respective peripheries by a fold or shelf. Any convenient RF transmission line, e.g., a waveguide or coaxial cables, can be used to inject RF energy into the folded cavity. In certain embodiments, both the width and length of the housing are each less than ½ of a free-space wavelength, and the antenna is capable of producing very accurate circular polarization and is capable of handling very high power levels, e.g., 10 kW, thereby making it suitable for high power applications which require extremely compact antenna elements, e.g., wide-scan phased array antennas.
Owner:RAYTHEON CO
High-frequency waveguide and phase shifter using same, radiator, electronic device which uses this phase shifter and radiator, antenna device, and electronic device equipped with same
InactiveCN102160236AReduce distancePrevent escapeParticular array feeding systemsProtective material radiating elementsElectrical conductorWaveguide
The invention refers to a high-frequency waveguide and a phase shifter using the same, a radiator, an electronic device which uses this phase shifter and a radiator antenna device, and an electronic device equipped with the same. This high-frequency waveguide is formed by first / second conductors (22, 23) which are arranged facing each other with an interval of less than lambda 0 / 2 when the free space wavelength of the operating frequency of the high-frequency signal is lambda0. In a waveguide-forming part between these first / second conductors (22, 23), a ridge (25) which protrudes from one toward the other of the first / second conductors (22, 23) and which is formed by extending along the waveguide-forming part is provided. Multiple columnar protrusions (24) with a height of lambda0 / 4 are arranged with an interval of less than lambda0 / 2 on at least one of the first / second conductors (22, 23) outside of the aforementioned waveguide-forming part and lateral to the ridge (25).
Owner:PANASONIC CORP
Compact dual-band resonator using anisotropic metamaterial
ActiveUS7952526B2The implementation process is simpleImproving Impedance MatchingSimultaneous aerial operationsRadiating elements structural formsAnisotropic metamaterialDual band antenna
Owner:RGT UNIV OF CALIFORNIA
Multiple-element antenna array for communication network
ActiveUS7538740B2Reduce in quantityReduce signalingIndividually energised antenna arraysPolarised antenna unit combinationsRadiating elementDuplexer
Owner:ALCATEL-LUCENT USA INC
Low-profile low-cross-polarization dual-polarized broadband antenna
InactiveCN106816694ALow profileSuitable for processingAntenna arraysRadiating elements structural formsCopper foilCross polarization
The invention relates to a low-profile low-cross-polarization dual-polarized broadband antenna comprising a resonant cavity, an upper microstrip board, a lower microstrip board, four feed probes and a coaxial medium. A rectangular upper-layer copper foil paster is arranged at the middle of the top surface of the upper microstrip board; and a rectangular lower-layer copper foil paster is arranged at the middle of the bottom surface of the lower microstrip board. The four feed probes distributed in the resonant cavity uniformly enable the upper-layer copper foil paster to be transited to the bottom of the resonant cavity vertically in a feed mode and, together with the coaxial medium, form a coaxial radio-frequency connection port. And a 45-degree angle is formed between each side of the upper-layer copper foil paster and each side of the resonant cavity. The profile height of the dual-polarized broadband antenna is 0.1-0.15 lambda0, wherein the lambda0 expresses a free space wavelength of a central frequency point. Therefore, the antenna unit performance can be improved obviously and thus the work bandwidh reaches 60%. More than two low-profile low-cross-polarization dual-polarized broadband antennas are connected in parallel to form a low-profile low-cross-polarization dual-polarized broadband antenna array.
Owner:CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
Wavelength Division Multiplexing/De-Multiplexing Optical Assembly for High Speed Parallel Long Distance Transmission
InactiveUS20130330080A1Reduce couplingShort transmission distanceWavelength-division multiplex systemsOptical light guidesMultiplexingOptical isolator
A wavelength division multiplexing / de-multiplexing optical assembly for high speed parallel long distance transmission, wherein, the output terminal of the laser group is provided with the silicon lens group, the optical adjusting plate group, the lower layer silicon lens array, the lower layer filter group, and the lower layer free space wavelength division multiplexer, the optical isolator, and the focusing lens arranged in turn; the output terminal of the focusing lens is coupled with an input optical fiber; an output optical fiber is coupled with the collimating lens; the output terminal of the collimating lens is coupled with a prism; the output terminal of the prism is provided with the upper layer free space wavelength division multiplexer, the upper layer filter group, the upper layer silicon lens array and the detector group arranged in turn. Thereby, multiplexing / de-multiplexing of optical signals is realized by use of filter groups.
Owner:INNOLIGHT TECHNOLOGY (SUZHOU) LTD
Antenna device
InactiveUS9136605B2Prevent leakageLower performance requirementsWaveguide hornsIndividually energised antenna arraysEngineeringAntenna element
Owner:HONDA ELESYS CO LTD
Antenna device and radar apparatus
An antenna device includes subarray antennas including antenna elements, feeding lines and feeding interfaces. At least one of the feeding lines includes a phase shifter which shifts phases of the signals feeding to corresponding antenna elements. The feeding lines feed signals to the antenna elements. Each feeding interface is connected to each of subarray antennas. The subarray antennas are arranged parallel to each other with an interval on a plane to be symmetrical about a central axis. The interval is less or equal than a free-space wavelength. The central axis is along with the center of two adjacent subarray antennas arranged at middle of the subarray antennas when the number of the subarray antennas is even. Moreover, the central axis is along with one subarray antenna arranged at the middle of the subarray antennas when the number of the subarray antennas is odd.
Owner:KK TOSHIBA
Waveguide slot array antenna apparatus
InactiveCN101965664AAppropriate vibration distributionLinear waveguide fed arraysSlot antennasClassical mechanicsLength wave
A waveguide slot array antenna apparatus having a polarized wave plane in an oblique direction of a tube axis of a waveguide with proper excitation distribution of an aperture part for electromagnetic wave radiation or incidence. The waveguide slot array antenna apparatus is characterized by having a waveguide slot array antenna composed of a rectangular antenna waveguide whose cross section orthogonal to a tube axis is rectangular, wherein the antenna waveguide has a power feeding port at one end side in the tube axis direction, while the other end side is short-circuited. At a first wide plane of a pair of wide planes in parallel with the tube axis on the antenna waveguide, a plurality of elongated and rectangular (excluding square) apertures for electromagnetic wave radiation or incidence are arranged at intervals of about lambda g / 2 (lambdag is intra-tube wavelength) along the tube axis. Each of the apertures has the same specified angle relative to a center line in parallel with the tube axis of the first wide plane, and adjacent apertures are arranged alternately at opposite positions relative to the center line. Each of the apertures at one side relative to the center line of the first wide plane is longer in length than about lambda f / 2 (lambda f is free-space wavelength), while each of the apertures at the other side is shorter than about lambda f / 2.
Owner:MITSUBISHI ELECTRIC CORP
Tunable microwave resonator for static dynamic nuclear polarization (DNP)
InactiveUS20160334476A1Measurements using magnetic resonanceMagnetic variable regulationSelective reflectionProton resonance frequency
A tunable millimeter-wave (mmw) DNP probe head is disclosed that is compatible with efficient H / X / Y / e− DNP in samples that may have volume large compared to λ03, where λ0 is the free-space wavelength at the frequency fe of the electron paramagnetic resonance (EPR) when placed in an external polarizing field B0, where B0 is typically in the range of 6.5 T to 35 T, corresponding to fe in the range of 180-1000 GHz, and corresponding to proton resonance frequency fH in the range of 280 MHz to 1500 MHz. The probe head comprises a tune cavity of adjustable volume, a sample cavity that is large compared to the sample wavelength, a tapered conical feed transition filled with a high dielectric material at the small end, and a selectively reflective wall that is substantially reflective of electromagnetic radiation at fe but substantially transparent to electromagnetic radiation at fH.
Owner:DOTY SCI
Small all-metal slow wave device
ActiveCN104064422AIncrease output powerImprove output efficiencyTransit-tube circuit elementsElectrical conductorVacuum electronics
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Four-port multi-input-multi-output (MIMO) antenna with high isolation degree
InactiveCN105789888AImprove work efficiencyIncrease channel capacityRadiating elements structural formsAntennas earthing switches associationMulti inputDielectric substrate
The invention relates to a four-port multi-input-multi-output (MIMO) antenna with high isolation degree. The four-port MIMO antenna comprises a grounding metal plate (1), a dielectric substrate (2), four antenna radiation units (3), four 1 / 4 wavelength impedance converters (4), four 50-ohm microstrip lines (5) and four metal patches (6). The MIMO antenna is provided with four antenna units, the resonant frequency is 5.2GHz, and the nearest distance between adjacent two antenna units is only 4.75 millimeters and is about 0.082 times of wavelength of a free space corresponding to the resonant frequency; the MIMO antenna is compact in structure and small in size; and the coupling degree among the antenna units is below -19.5dB by a vertical polarization technology and a method of additionally arranging a coupling path on the premise of no increase on the antenna size, and the MIMO antenna is high in isolation degree and is expected to be widely applied to the technical field of wireless communication.
Owner:HARBIN FEIYU TECH
Waveguide connection structure
ActiveUS20090309680A1Reduce leakageImprove connection characteristicsWaveguidesSignal waveElectrical conductor
A rectangular conductor pattern is formed around a first waveguide on a multilayer dielectric substrate facing a metal substrate, with an end at about λ / 4 away from a long side edge of the first waveguide, where λ is a free-space wavelength of a signal wave. A conductor opening is formed between the end of the conduction pattern and the long side edge of the first waveguide, with a length longer than a long side of the first waveguide and shorter than about λ. A closed-ended dielectric transmission path is formed in the multilayer dielectric substrate in the layer direction, with a length of about λg / 4, where λg is an in-substrate effective wavelength of the signal wave.
Owner:MITSUBISHI ELECTRIC CORP
Antenna device
InactiveCN102931497AImprove efficiencyWaveguide hornsIndividually energised antenna arraysAntenna elementOperating frequency
An antenna device includes antennas, each of which includes antenna elements arranged in a longitudinal direction, arranged side by side in a transverse direction intersecting the longitudinal direction, wherein an interval between the antennas arranged side by side in the transverse direction is approximately 2[lambda]. where [lambda] is a free space wavelength corresponding to an operating frequency, and each of the antenna elements includes a horn formed therein.
Owner:HONDA ELESYS CO LTD
Antenna device and radar apparatus
An antenna device includes subarray antennas including antenna elements and feeding interfaces. Each feeding interface is connected to each of subarray antennas. The subarray antennas are arranged parallel to each other with an interval on a plane to be symmetrical about a central axis. The interval is less or equal than a free-space wavelength. The central axis is along with the center of two adjacent subarray antennas arranged at middle of the subarray antennas when the number of the subarray antennas is even. Moreover, the central axis is along with one subarray antenna arranged at the middle of the subarray antennas when the number of the subarray antennas is odd.
Owner:KK TOSHIBA
Extraordinary light transmission apparatus and method
ActiveUS20110158575A1High light transmittanceAdd depthRecord information storageNanoopticsMaximum dimensionSub wavelength
An optical apparatus that provides extraordinary light transmission through a sub-wavelength-sized light transmitting region of the apparatus includes a core region of dielectric material having a complex dielectric constant, ε1, surrounded by a metallic cladding material having a complex dielectric constant, ε2, wherein the core region has a maximum dimension, 2a, further wherein 2a is less than λ, where λ is the free-space wavelength of light incident on an input side of the apparatus, and further wherein |ε1| is greater than 0.5|ε2|, ε1 has a positive real part, and ε2 has a negative real part, whereby the incident light will be transmitted by and exit the apparatus from an output side with extraordinary transmission.
Owner:CORNELL UNIVERSITY
Surface plasmon lens integrated with metal nano-cavity
The invention discloses a surface plasmon lens integrated with a metal nano-cavity. The surface plasmon lens comprises a substrate, a gold film, a nano-seam circular ring and a metal nano-cavity, wherein the gold film is plated on the upper surface of the substrate; the nano-seam circular ring is positioned on the gold film, and passes through the gold film; the metal nano-cavity is a rectangular hollow groove, is positioned in the center of the nano-seam circular ring, and is etched in the gold film to a certain depth from the upper surface of the gold film without being etched completely. In the surface plasmon lens, a light field can be localized into a light spot which is 6.0*10<-3>lambda0<2> (lambda0 is the free space wavelength of incident light) under the condition of resonance of the metal nano-cavity, and the light intensity of a lens center is increased by 5,500 times than a cavity-free situation simultaneously. The use of radial polarized light in a light source is avoided, accurate alignment of a light beam center and the lens center is not required, the application range is larger, and the greater convenience is brought to use. Moreover, the surface plasmon lens is convenient to process, and is easy for high-quality preparation.
Owner:PEKING UNIV
Imaging Radar Sensor with Horizontal Digital Beam Forming and Vertical Object Measurement by Phase Comparison in Mutually Offset Transmitters
ActiveUS20170293028A1Avoid calibrationAntenna adaptation in movable bodiesIndividually energised antenna arraysThree-dimensional spaceRadar imaging
According to the invention, a device and a method are provided for determining the position of an object, in particular a moving object, in the three-dimensional space. The device comprises at least two switchable transmitting antennas having a different vertical position of the phase center as well as a plurality of receiving antennas which are arranged in series. The transmitting antennas are arranged in the horizontal direction and at a distance that corresponds to the distance of the receiving antennas. The transmitting antennas are vertically offset with respect to each other by a value that is less than or equal to half the free-space wavelength of the transmitted signal. The transmitting antennas can otherwise be arranged at any position around the receiving antenna. Horizontal beam sweep across a wide angular range is carried out according to the method of “digital beamforming”. The measurement of the vertical object position is carried out by phase measurement between the antenna beams when the transmitting antennas are sequentially switched.
Owner:CRUISE MUNICH GMBH
Emitter for vertically polarized wireless signals
ActiveUS20140028512A1Reduce manufacturing costResonant long antennasLoop antennasElectrical conductorCoupling
An electric emitter for vertically polarised wireless signals for a communication service with a narrow frequency bandwidth around a frequency fo with free-space wavelength λo in the gigahertz range, comprising at least one substantially horizontally oriented conductor loop arranged above a conductive base area, with an emitter infeed point for electromagnetic excitation of the loop relative to the base area. The loop is formed by a circularly closed ring conductor running in a substantially horizontal plane with a height h of less than λo / 6 over the base area. Distributed over the periphery of the ring conductor are at least three vertical emitters electromagnetically coupled to the ring conductor coupling points and running to the base area, wherein at least two of the emitters are electromagnetically coupled to the base area at earth terminal points, and a vertical emitter is excited via the emitter infeed point at the lower end thereof.
Owner:DELPHI DEUTLAND
Waveguide antenna for a radar antenna array
ActiveUS9184506B2Reduce lossCost efficient to manufactureAntenna adaptation in movable bodiesRadio wave reradiation/reflectionRadarMode transformation
A waveguide antenna for a radar antenna array, particularly for use in motor vehicles, includes a metal waveguide extending in an x direction and having a longitudinal axis, which, for the propagation of a radar wave of a first mode in the x direction, delimits an inner space, wherein in order to specifically convert the first mode to a second mode of the radar wave which is different from the first mode and to couple the second mode out of the waveguide, a plurality of structural elements arranged in the x direction are provided which extend into the inner space and wherein adjacent structural elements have a distance which is larger than half a waveguide wavelength of the radar wave of the first mode or larger than half a free-space wavelength, depending on which of the two wavelengths is smaller.
Owner:CONTI TEMIC MICROELECTRONIC GMBH
Broadband patch antenna with stable high gain
ActiveCN111541041ARadiation suppressionHigh gainAntenna supports/mountingsRadiating elements structural formsEngineeringBroadbanding
The invention provides a broadband patch antenna with a stable high gain. The broadband patch antenna is composed of a metal floor, a circular radiation patch, a differential feed port, a first shortcircuit assembly, a second short circuit assembly, a first metal sheet and a second metal sheet. The diameter of the radiation patch is greater than the half free space wavelength at the central working frequency, and a first gap, a second gap and a third gap are arranged at the first diameter position of the radiation patch, and the second gap and the third gap are respectively arranged at two sides of the first gap; the first metal sheet and the second metal sheet are positioned between the metal floor and the radiation patch; the differential feed port is provided with a first feed body used for feeding to the first metal sheet and a second feed body used for feeding to the second metal sheet; the metal floor is connected with the radiation patch through the first short-circuit assemblyand the second short-circuit assembly; and the first metal sheet and the second metal sheet, the first feed body and the second feed body, and the first short circuit assembly and the second short circuit assembly are respectively distributed in a mirror image manner about a plane which passes through the first diameter and is vertical to the radiation patch.
Owner:SHENZHEN UNIV
Imaging radar sensor with horizontal digital beam forming and vertical object measurement by phase comparison in mutually offset transmitters
ActiveUS10871562B2Avoid calibrationAntenna adaptation in movable bodiesIndividually energised antenna arraysRadar imagingThree-dimensional space
Owner:CRUISE MUNICH GMBH
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