216 results about "Split ring resonators" patented technology

A magnetic field focusing assembly includes a magnetic field generating device configured to generate a magnetic field, and a split ring resonator assembly configured to be magnetically coupled to the magnetic field generating device and configured to focus the magnetic field produced by the magnetic field generating device.

A system, method, and apparatus for detecting at least one condition of interest relating to a tube, e.g. the presence of an air bubble. In some embodiments, the sensor includes antennas, a split-ring resonator, a frequency generator capable of generating frequencies in the microwave range, and a detection component. The detection component may estimate at least one parameter of received microwave energy in order to determine if a condition of interest exists.

The invention provides simplified negative index materials (NIMs) using wire-pair structures, 4-gap single ring split-ring resonator (SRR), fishnet structures and overleaf capacitor SRR. In the wire-pair arrangement, a pair of short parallel wires and continuous wires are used. In the 4-gap single-ring SRR, the SRRs are centered on the faces of a cubic unit cell combined with a continuous wire type resonator. Combining both elements creates a frequency band where the metamaterial is transparent with simultaneously negative ε and μ. In the fishnet structure, a metallic mesh on both sides of the dielectric spacer is used. The overleaf capacitor SRR changes the gap capacities to small plate capacitors by making the sections of the SRR ring overlap at the gaps separated by a thin dielectric film. This technique is applicable to conventional SRR gaps but it best deploys for the 4-gap single-ring structures.

Antennas developed for electromagnetic field energy harvesting, typically referred to as rectennas, provide an alternative electromagnetic field energy harvesting means to photovoltaic cells if designed for operation in the visible frequency spectrum. Rectennas also provide energy harvesting ability or power transfer mechanism at microwave, millimeter and terahertz frequencies. However, the power harvesting efficiency of available rectennas is low because rectennas employ traditional antennas whose dimensions is typically proportional or close to the wavelength of operation. This invention provides a device for electromagnetic field energy harvesting that employs a plurality of electrically-small resonators such as split-ring resonators that provide significantly enhanced energy harvesting or energy collection efficiency while occupying smaller footprint. The invention is applicable to electromagnetic energy harvesting and to wireless power transfer.

Filter for microwaves and millimetER waves, characterised in that it comprises a planar transmission medium (1) that it includes a conductor strip (3), metallic ground plane (4) and dielectric substrate (2) and in that it includes at least one split rings resonator (5a, 5b, 5c, 5d, 5e and 5f)

The invention provides a terahertz metamaterial biosensing chip and a testing method of the terahertz metamaterial biosensing chip. The terahertz metamaterial biosensing chip comprises a substrate and a sub-wavelength metallic split-ring resonator array attached on the substrate, wherein the substrate is made of a material having the absorption coefficient less than 0.5-1cm under the terahertz waveband; the sub-wavelength metallic split-ring resonator array comprises multiple split-ring resonator units, each split-ring resonator unit is a square metal frame; and the middle parts of the edges of the square metal frame are provided with same openings respectively. Compared with the existing biosensor, the terahertz metamaterial biosensing chip is made of the terahertz metamaterial, so that the uniformity of the terahertz metamaterial biosensor structure is improved, and the sensing sensitivity is improved due to the uniformity and simple structure design.

The invention relates to the field of metamaterial devices and provides a switching-controllable THz wave metamaterial perfect absorber (MPA) and a control method thereof. The switching-controllable THz wave metamaterial perfect absorber comprises a substrate, an MIT (metal-insulator transition) layer positioned on the substrate, a dielectric layer positioned on the MIT phase change layer and metal opening resonance units positioned on the dielectric layer and being in cyclic arrangement, and the on/off of the absorber at the resonance frequencies of the metal opening resonance units is realized through changing the conductivity of the MIT phase change layer. According to the invention, the variation of the conductivities of the MIT phase-change material before and after phase change is utilized to change the absorptivity of the absorber, so that the THz MPA can be turned on/off near the resonance frequency of the metal opening resonance units, initiative control of the electromagnetic transfer characteristics of THz wave bands at the specific frequency, and accordingly, a larger on-off ratio or modulation depth can be obtained; and the switching-controllable MPA adopting the substrate-vanadium dioxide-dielectric layer-SRRs (Split Ring Resonators) four-layer structure can control the conductivity of vanadium dioxide through an external field so as to control the absorptivity of the MPA.

A magnetic field focusing assembly includes a magnetic field generating device configured to generate a magnetic field, and a split ring resonator assembly configured to be magnetically coupled to the magnetic field generating device and configured to focus the magnetic field produced by the magnetic field generating device.

The invention discloses a substrate integrated waveguide split ring resonator-based microwave band pass filter. The microwave band pass filter comprises a substrate integrated waveguide which is formed by fixing two rows of metal members on a dielectric substrate, wherein the two ends of the substrate integrated waveguide are connected with a micro-strip feed line respectively; the surfaces of both the micro-strip feed line and the substrate integrated waveguide are made of metal dielectric; the upper surface of the substrate integrated waveguide is positioned between the two rows of metal members to corrode an m*n split ring resonator array; and a row of dumbbell-shaped area bodies or dumbbell-shaped deformation areas are corroded corresponding to each line of split ring resonators on the lower surface of the substrate integrated waveguide between the two rows of metal members. The band pass filter has the advantages of out-of-band steep attenuation, small volume, light weight and high power capacity and is easy to be integrated with other planar microwave and millimeter-wave circuits, so that the band pass filter is expected to be applied to the microwave and millimeter-wave integrated circuit or a millimeter wave integrated circuit.

Magnetic resonance imaging (MRI) devices detect a magnetic field having a particular frequency induced by hydrogen nuclei included in a human body and convert the detected magnetic field into two- or three-dimensional images, thereby visualizing the internal structure of the human body without causing any harm to the human body. The higher the resolution of an MRI technique, the more accurate a diagnosis can be obtained. Thus, various methods are introduced to improve resolutions. For example, a wearable magnetic resonator and an application device including the wearable magnetic resonator are provided. The wearable magnetic resonator is flexible and used to improve MRI resolution by amplifying MR signals while being attached to a human body to amplify MR signals when MRI is performed. The wearable magnetic resonator includes the following: a dielectric thin film that is flexible; and a conductor thin film that is disposed to have a split ring resonator (SRR) structure on the dielectric thin film and is flexible, wherein the wearable magnetic resonator includes an inductance component and a capacitance component, and the wearable magnetic resonator amplifies a magnetic field by resonating at a predetermined frequency, thereby improving a MRI resolution.

An apparatus and method are disclosed for detecting terahertz radiation at room temperature. A detecting pixel includes a sub-wavelength split-ring resonator, and is mechanically coupled to (but thermally decoupled from) a substrate via a cantilever formed from two materials that have a significant mismatch in their thermal expansion coefficients. Incident radiation causes the split-ring resonator to resonate, thereby generating heat that is transferred to the cantilever, causing the cantilever to flex. An optical readout system includes a secondary light source, such as a laser, that shines on a reflective surface on the pixel, whereby a photodiode detects the reflected light and permits calculation of a relative deflection of the pixel in the nanometer range. An exemplary detector has a noise equivalent power rating of approximately 60 pW/√Hz.

A multi-input multi-output (MIMO) antenna for improving isolation is provided. Split ring resonators (SRRs) are structurally arranged on the lower end of a ground surface between a plurality of antenna patterns spaced apart from each other. Accordingly, permeability of the SRRs has a negative value, which prevents current from flowing between antennas. Consequently, the isolation characteristic of the antennas is improved.

The invention relates to a dual-frequency terahertz band-pass filter, in particular to the design and production of the dual-frequency terahertz band-pass filter with a semi-insulating gallium arsenide based hollow surface and a complementary split ring resonator, and relates to the terahertz technology and the technical field of semiconductor micromachining. The dual-frequency terahertz band-pass filter utilizing the working principle of the complementary split ring resonator achieves surface plasma polariton resonance through the adjustment on the inner diameter, outer diameter, opening width and periodic structure of the C-SRR (split ring resonator) and obtains low-frequency and high-frequency resonance in two abnormal transmission enhancement modes of inductance-capacitance (LC) resonance. The energy conversion between two resonance frequencies is achieved through the electromagnetic interaction of the two resonances, so that the terahertz reaching the same transmission strength at two bands can be output. The dual-frequency terahertz band-pass filter takes advantage of an existing semiconductor micromachining process and is simple in production process, easy to operate and capable of accurately controlling a micro-structure machining area of the complementary split ring resonator and greatly reducing production costs.

A split ring-resonator includes a substrate, an inner-trench or cavity formed into the substrate, the inner trench or cavity including a split, and an outer trench or cavity formed into the substrate around the inner trench or cavity, the outer trench or cavity including another split disposed at an opposite end of the split in the inner trench or cavity, wherein the inner trench or cavity and the outer trench or cavity are configured to receive an electrically conductive gas and/or plasma to form a split-ring resonator,

An infusion pump assembly is disclosed. The infusion pump assembly includes a reservoir for receiving an infusible fluid, a pump assembly for pumping a quantity of infusible fluid from the reservoir to an exit, a first valve assembly configured to selectively isolate the pump assembly from the reservoir, a second valve assembly configured to selectively isolate the exit from the pumping assembly, and a split ring resonator antenna having a resonant frequency comprising a plurality of planar metallic layers.

Provided are systems and methods to generate single-cycle THz pulses from a few tens of nanometers thin layer of split ring resonators (SRRs) via optical rectification of femtosecond laser pulses. The emitted THz radiation, with a spectrum ranging from about 0.1 to 4 THz, arises exclusively from pumping the magnetic-dipole resonance of SRRs around 200 THz. This resonant enhancement, together with pump polarization dependence and power scaling of the THz emission, underpins the nonlinearity from optically induced circulating currents in SRRs, with a huge effective nonlinear susceptibility of 0.8×10⁻¹⁶ m²/V that far exceeds surface nonlinearities of both thin films and bulk organic/inorganic crystals and sheet nonlinearities of non-centrosymmetric materials such as ZnTe.

The invention provides an ultra broadband antenna of an integrated filter, which comprises a medium substrate, a microstrip feeder structure of a radiating unit arranged on one side of the medium substrate, the other side of the medium substrate is partially grounded, the radiating unit is provided with a split-ring resonator (SRR), and a microstrip line is directly connected to the radiating unit. The antenna relates to the invention has excellent broadband property and good omnidirectional radiation property, and the antenna is integrated with a filter with a complementary split-ring resonator (CSRR), so that the influence between the communication of local area network and ultra broadband communication system of the antenna can be prevented. The antenna provided by the invention has the advantages that the design is simple and compact, the volume is small, the process is convenient and the cost is low. The antenna can be applied to electronic reconnaissance device and electronic countermeasure device and the like.

The bandpass filter comprises transmission line comprising a conductor strip (2), and, in said transmission line, at least one bandpass filter cell, comprising at least one split-rings resonator (6, 7), inductive element (4, 41) and capacitive element (3). The bandpass filter has a frequency response in which at least one passband can be identified. The conductor strip, split-rings resonator(s), inductive element(s) and capacitive element(s) are dimensioned and arranged so that the bandpass filter, for frequencies within said passband, behaves as a left-handed transmission line for at least one range of frequencies within said passband, and as a right-handed transmission line for at least another range of frequencies within said passband, thus providing for a large bandwidth. The invention also relates to an electronic device including the filter, and to a method of producing it.

The invention discloses a dual-band adjustable band-pass filter. The filter comprises an upper layer microstrip line structure, a middle layer dielectric substrate, a lower layer grounding metal plate and a metal through hole, wherein the microstrip line structure comprises a multi-mode resonator and a pair of input/output feeder lines; the multi-mode resonator comprises two split ring resonators that are arranged symmetrically left and right; the opening position of each split ring resonator is connected through a group of series-wound variable capacitance diodes; the centers of the two split ring resonators are connected through a group of series-wound variable capacitance diodes; a section of short open-circuit branch microstrip line, which is loaded by the variable capacitance diode at the tail end, is loaded in the middle of the group of the series-wound variable capacitance diodes; extra branch coupling is introduced to the space between the split ring resonators; and the input/output feeder lines are microstrip lines with one short-circuit ends and the other open-circuit ends. The two passbands of the filter are adjustable, and the bandwidth is controllable as well; and meanwhile, only one multi-mode resonator is adopted, so that the dual-band adjustable band-pass filter has relatively high advantage in miniaturization.

The present invention relates to a biosensor (1) which enables the concentration of a desired molecule inside a liquid in the medium, and essentially comprises at least one metallic plate (2) which functions as a ground plate, and which is preferably manufactured from aluminum, at least one dielectric substrate (3) which is located on top of the metallic plate (2), at least one split-ring resonator (4) which is realized on top of the dielectric substrate (3), and which is coated with a dielectric layer, at least two symmetrical antennas (5) which are realized on the same plane with the split-ring resonator (4) on the substrate (3), at least two ports (6) where a network analyzer is connected with the antennas (5) via SMA (SubMiniature Version A) connectors.

The invention belongs to the technical field of antennas in communication systems, and in particular relates to a notch controllable ultra-wideband antenna. Including microstrip feeder, radiation unit, dielectric substrate, and grounding plate; the microstrip feeder and radiation unit are the upper layer, the dielectric substrate is the middle layer located below the microstrip feeder and radiation unit, and the grounding plate is the lower layer located below the dielectric substrate; the radiation An open circuit slot and an split resonator ring are provided on the unit, and the open circuit slot extends from the right edge of the radiation unit to the inside of the radiation unit; a first split resonator ring and a second split resonator ring are provided on the ground plate; A first PIN diode and a second PIN diode are respectively loaded on the gap and the split resonant ring; a third PIN diode and a fourth PIN diode are respectively loaded on the first split resonant ring and the second split resonant ring. The invention can realize ultra-wideband, single-band notch, double-band notch and triple-band notch, has a simple structure and is suitable for ultra-wideband wireless communication systems.