36 results about "Tunable metamaterials" patented technology

The present invention relates to a compound of formula (A) in which the occurring groups and parameters have the meanings defined in claim 1, to a liquid crystal medium comprising a compound of formula (A) and to high-frequency components comprising these media, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures, and electronic beam steering antennas, e.g. phased array antennas.

The present disclosure provides energy absorbing materials and methods of fabricating the same. The energy absorbing materials of the present disclosure comprise a plurality of repeating cells, wherein each of the plurality of cells comprises a three-dimensional plate lattice, wherein a least a portion of plate lattice is prebuckled.

The present invention relates to an indene derivative of formula D as specified in claim 1, to a liquid crystal medium comprising a compound of formula D and to high- frequency components comprising these media, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures, and electronic beam steering antennas, e.g. phased array antennas.

The invention provides a tunable metamaterial wave absorber, which comprises a flexible dielectric layer, a metal reflecting layer and a plurality of periodically arranged metal resonant structures, the metal resonant structures are arranged on the first surface of the flexible dielectric layer, the metal reflecting layer is arranged on the second surface of the flexible dielectric layer, and the flexible dielectric layer deforms when being stressed, so that the shape of each metal resonant structure is changed, and the area of each metal resonant structure is not changed. The shape of each metal resonance structure is changed in real time, so that the electromagnetic resonance frequency of the metamaterial wave absorber can be adjusted, wave absorbing requirements of different frequencies are met, a plurality of frequency points with the absorption rate higher than 90% exist in the frequency band of 2-18 GHz, and the metamaterial wave absorber has wide application prospects in the fields of radar stealth, wearable equipment, intelligent radio frequency tags and the like.

The invention discloses a stealth coating material for aviation aircrafts. According to the invention, a three-layer composite structure design is adopted; the intelligent sensing layer is composed of graphene quantum dots and a piezoelectric nanofiber composite network, so that real-time sensing of electromagnetic wave signals is realized; the tunable metamaterial layer comprises a liquid crystal elastomer matrix and nickel-titanium alloy nanowires dispersed in the liquid crystal elastomer matrix, and electromagnetic parameters of the material are dynamically adjusted by applying an electric field or a temperature field; vanadium dioxide nanoparticles, a photonic crystal structure and carbon nanotube aerogel are integrated in the multispectral stealth layer, and radar, infrared and visible light multispectral synergistic stealth is achieved. The coating is further integrated with a microencapsulation repairing agent and an intelligent control system, and has the self-repairing and self-adaptive adjusting functions. Compared with the prior art, 0.1-40 GHz ultra-wide frequency band radar wave absorption is achieved, the radar cross section is reduced by 25-30 dB, the infrared radiation characteristic is reduced by 80% or above, the surface density is only 1.2-1.5 kg / m, the weight is reduced by 65% compared with a traditional coating, and a key material technical support is provided for a new generation of stealth aircrafts.

The present invention discloses a dual-frequency / broadband switchable dynamically tuned metamaterial terahertz absorber, comprising M*N multilayer terahertz absorption units, each of which is distributed in an M*N two-dimensional pattern, where M and N are both positive integers. Each multilayer terahertz absorption unit comprises a metal substrate, a dielectric layer, and a resonant layer, arranged sequentially from bottom to top. The dielectric layer and the metal substrate are both square in shape with equal sides. The resonant layer comprises a single-layer graphene layer with a hollow cross, wherein a solid cross-shaped vanadium dioxide layer is embedded in the hollow portion of the single-layer graphene layer with the hollow cross. The single-layer graphene layer with the hollow cross has a cross-shaped shape. The absorber is dynamically tuned, has polarization insensitivity, and can maintain stable absorption within an incident angle range of 0-60°. A preparation method for the dual-frequency / broadband switchable dynamically tuned metamaterial terahertz absorber is also disclosed.

The present invention relates to heteroaromatic isothiocyanates of formula (N) as defined in claim 1, to liquid crystalline media comprising one or more compounds of formula (N), and to high-frequency components comprising these media, in particular to microwave components for high-frequency devices, such as devices for changing the phase of microwaves, tunable filters, tunable metamaterial structures and electron beam steering antennas, such as phased array antennas.

A compound of formula UIand a liquid crystal medium containing the compound of formula UI and high-frequency components containing such media, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures, and electronic beam steering antennas, for example, phased array antennas.

The present disclosure provides a protective enclosure for electronic systems integrating two key components: a preconfigurable polymer matrix and a tunable metamaterial. The polymer matrix forms a lightweight, structurally robust foundation with excellent mechanical properties and design flexibility, configurable for specific application requirements. Integrated within this matrix is a highly adaptable metamaterial system, precisely tunable to interact with electromagnetic energy in customized ways. By adjusting its permittivity and permeability, the metamaterial can selectively repel or absorb specific frequencies of electromagnetic radiation, allowing targeted shielding against harmful interference while permitting desired communication signals to pass through. This integration overcomes limitations of traditional electromagnetic shielding approaches, offering enhanced design flexibility and customization for various electronic applications. The use of carbon nanoparticles enables fine-grained control over the metamaterial's electromagnetic properties, creating protective enclosures that effectively manage electromagnetic energy while remaining lightweight and mechanically robust.

Heteroaromatic isothiocyanates of formula Nwherein RN, AN1, AN2, ZN1, ZN2, W, X1, X2, and n are as defined herein can be used in liquid crystalline media. Liquid-crystalline media comprising one or more compounds of formula N are suitable for use in high-frequency components, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures, and electronic beam steering antennas, e.g., phased array antennas.

The present disclosure provides a protective enclosure for electronic systems integrating two key components: a preconfigurable polymer matrix and a tunable metamaterial. The polymer matrix forms a lightweight, structurally robust foundation with excellent mechanical properties and design flexibility, configurable for specific application requirements. Integrated within this matrix is a highly adaptable metamaterial system, precisely tunable to interact with electromagnetic energy in customized ways. By adjusting its permittivity and permeability, the metamaterial can selectively repel or absorb specific frequencies of electromagnetic radiation, allowing targeted shielding against harmful interference while permitting desired communication signals to pass through. This integration overcomes limitations of traditional electromagnetic shielding approaches, offering enhanced design flexibility and customization for various electronic applications. The use of carbon nanoparticles enables fine-grained control over the metamaterial's electromagnetic properties, creating protective enclosures that effectively manage electromagnetic energy while remaining lightweight and mechanically robust.

The invention relates to the technical field of gas concentration detection, and particularly provides a gas detection device and a gas detection method.The gas detection device comprises a tunable metamaterial detector and a differentiator, the tunable metamaterial detector is configured to be capable of being switched among a plurality of target wavebands and detecting target light of the target wavebands, and the differentiator is configured to be switched among the target wavebands; the corresponding detection light intensity is obtained; wherein the target light is absorbed by mixed gas, and the mixed gas comprises a plurality of gas components; the detection light intensity comprises a first type of light intensity after being absorbed by various gas components and a second type of light intensity after being absorbed by a single gas component; and the differentiator is configured to perform dual-wavelength differential calculation on the first-class light intensity and the second-class light intensity to obtain the concentration of the gas components. According to the invention, the requirements of anti-interference performance, low cost and small size in a complex gaseous environment can be met.

The invention discloses an adjustable metamaterial composite structure based on a microstrip line. The adjustable metamaterial composite structure comprises the microstrip line, a chip inductor, a variable capacitance diode, a magnetic bead and a resistor, the left side part and the right side part of the central conduction band of the microstrip line are respectively and periodically provided with mechanical through holes which are through up and down; the chip inductors are inserted into the mechanical through holes and are communicated with the central conduction band of the microstrip line and the grounding plate; the middle part of a central conduction band of the microstrip line is periodically engraved with double slits, the variable capacitance diodes cross each slit of the double slits and are communicated with the central conduction band of the microstrip line, the cathodes of the two variable capacitance diodes cross the double slits are opposite to each other, and a circuit for applying direct current voltage to the variable capacitance diodes is arranged between the cathodes of the two variable capacitance diodes; the middle part of the central conduction band of the microstrip line is arranged between the two slits and is also provided with a mechanical through hole penetrating up and down, and the magnetic bead is inserted into the mechanical through hole and is communicated with the central conduction band of the microstrip line and the grounding plate; the two tunneling peak frequencies of the adjustable metamaterial composite structure based on the microstrip line can be regulated and controlled through external voltage.

The present invention discloses a frequency-sweeping liquid metal tunable metamaterial absorber, comprising a base layer, a microfluidic layer, and an absorbing layer, which are sequentially arranged from bottom to top. The absorbing layer comprises a plurality of absorbing units distributed in an array, each absorbing unit having an inverted truncated cone-shaped cavity provided therein, and each cavity is filled with liquid metal. The microfluidic layer comprises a plurality of support columns, each of which is positioned between the absorbing unit and the base layer. A panel is provided on the outer edge of the microfluidic layer. Compared with the prior art, the frequency-sweeping liquid metal tunable metamaterial absorber of the present invention has the characteristics of real-time response, frequency-sweeping continuous tunability, polarization insensitivity, and stability over a wide incident angle.

The present invention relates to dihydronaphthalene derivatives of formula D specified in claim 1; to a liquid crystalline medium comprising a compound of formula D; and to high-frequency components containing these media, in particular microwave components for high-frequency devices such as devices for phase shifting microwaves, tunable filters, tunable metamaterial structures, and electron beam controlled antennas such as phased array antennas.

The invention belongs to the technical field of metamaterial wave absorption, and particularly relates to an adjustable metamaterial wave absorber based on microfluidics, which is formed by splicing a plurality of wave-absorbing units, each wave-absorbing unit comprises at least two layers of parallel microfluidic channel structures, and the parallel microfluidic channel structures are used for flowing of a wave-absorbing medium; two adjacent parallel microfluidic channel structures in the same horizontal direction are communicated; two adjacent parallel microfluidic channel structures are arranged in the middle of the resistive film resonance structure at intervals; and the metal grounding layer is connected to the bottom end of the resistive film resonance structure, and a spacing layer is arranged between the metal grounding layer and the end part of the resistive film resonance structure. Different wave-absorbing media are introduced into the at least two layers of parallel microfluidic channel structures, and switching of wave-absorbing states of the wave absorber can be realized by controlling injection and discharge of the wave-absorbing media.

The invention relates to the technical field of liquid crystal materials, and particularly discloses an isothiocyanate liquid crystal compound, a liquid crystal composition containing the isothiocyanate liquid crystal compound and a high-frequency assembly. The liquid crystal compound is a compound as shown in the following formula I, and Q1 represents O, S or Se. The main ring of the molecular structure of the liquid crystal compound provided by the invention contains a benzofuran, benzothiophene or benzoselenophene structure, and the liquid crystal compound with the specific structure has the advantages of higher clearing point, lower dielectric loss, higher dielectric tuning rate tau and higher quality factor eta. The liquid crystal composition containing the organic compound also has a higher clearing point, lower dielectric loss, higher dielectric tuning rate tau and a higher quality factor eta, and can be used for developing components and devices which are applied in a microwave range and have a high-frequency technology; the invention particularly relates to a microwave phase shifter, a tunable filter, a tunable metamaterial structure and an electronic beam control antenna. I.

The broadband electromagnetic wave adjustable metamaterial scatterer of the double-layer three-dimensional structure comprises a lower layer assembly arranged on the lower portion and used for absorbing low frequency and an upper layer assembly positively used for absorbing high frequency, and the lower layer assembly comprises a horizontally-laid substrate and a plurality of lower layer plates arranged on the vertical substrate. The plurality of lower layer plates are laid in parallel, first PIN diodes are arranged in the lower layer plates, first inductors are further arranged on the side surfaces of the lower layer plates, and the upper layer assembly is arranged above the lower layer assembly; by arranging the broadband adjustable absorber with the double-layer three-dimensional structure, the upper layer structure is mainly responsible for low-frequency electromagnetic absorption, and the lower layer structure is mainly responsible for high-frequency electromagnetic absorption; on one hand, the energy loss of the electromagnetic absorber is enhanced by the PIN diodes loaded in the upper and lower layer structures, so that broadband absorption is realized; and on the other hand, the input impedance of the absorber is regulated and controlled by virtue of the resistance effect of the PIN diode, so that the absorption is dynamically adjustable.

The application relates to a graphene 2-bit metasurface coding structure and a coding method, and belongs to the technical field of tunable metamaterials. The metasurface coding structure is composed of a substrate layer and a graphene layer unit structure array arranged in sequence, wherein the graphene layer is arranged on the upper surface of the substrate layer; the application is suitable for the field of terahertz communication and has important application value in the direction of encoders, multi-frequency switches and slow light devices.

The present invention relates to a compound of formula AN in which the occurring groups and parameters have the meanings defined in claim 1, to a liquid crystal material comprising a compound of formula AN and to high-frequency components comprising these media, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures, and electronic beam steering antennas, e.g., phased array antennas.