20 results about "Tunable metamaterials" patented technology

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.

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 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 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 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 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 metamaterial honeycomb comprises a plurality of honeycomb matrixes, the honeycomb matrixes are periodically filled with wave-absorbing foam, reinforcing rib units are formed by the adjacent honeycomb matrixes filled with the wave-absorbing foam, and metamaterial units are embedded into the side walls of the honeycomb matrixes; the metamaterial honeycomb further comprises an electric control module connected with the metamaterial units and a temperature control module connected with the honeycomb base body. According to the metamaterial honeycomb, the metamaterial units capable of being dynamically tuned are embedded in the honeycomb base body, geometric parameters of the units are controlled through an external electric field or temperature, real-time regulation and control of wave absorbing frequency bands are achieved, the requirements of complex electromagnetic environments are met, and the defects that a current metamaterial wave absorbing structure is fixed, and the structure is complex are overcome. And multiple electromagnetic responses of one structure cannot be realized.

Electroactive tunable metamaterial structures, devices, and methods are disclosed. In some aspects, an acoustic metamaterial structure for acoustic imaging includes a plurality of piezoactive membrane cells, each including a first passivation layer; an electrode layer in contact with the first passivation layer; a piezoelectric layer in contact with the electrode layer; a bulk membrane layer in contact with the piezoelectric layer; and a second passivation layer in contact with the bulk membrane layer, wherein the acoustic metamaterial structure is configured to steer and / or focus propagation of an acoustic signal based on electrical control signals to the piezoactive membrane cells to affect an acoustic propagation property.

Isothiocyanatoethynylbenzene derivatives of formula Iliquid crystal media comprising the isothiocyanatoethynylbenzene derivatives, and 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), and devices comprising said components. Further, an optical component comprising said liquid-crystalline media, operable in the infrared region of the electromagnetic spectrum, the use of said LC medium in the infrared (IR) region, and devices comprising said optical component.

The present invention relates to a liquid crystal material comprising a thiophene derivative of formula S as specified in claim 1, to a thiophene compound and to high- frequency components comprising said 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 discloses a hinge deformation adjustable metamaterial wave-absorbing unit of a composite magnetic patch and a regulation and control method. The wave absorbing unit is formed by connecting a dielectric loss framework and a magnetic material patch through a hinge structure; according to the hinge structure, the clamping hole and the inserting piece which are in special geometric fit are adopted, and stable and continuous rotation from 0 degree to 90 degrees is achieved; by adjusting the rotation angle t, the unit period, thickness and density can be synchronously and continuously changed, so that dynamic and continuous tuning of the electromagnetic wave absorption performance is realized; in order to realize large-scale application, the middle section of the framework is provided with a clamping hole structure, and array expansion of units can be realized through double-end splicing plug-ins. By utilizing a dielectric / magnetic composite loss mechanism, high-efficiency, continuous and adjustable electromagnetic wave absorption performance can be provided within an extremely wide band of 1.2 GHz to 40.0 GHz, and the technical problems that an existing wave absorption structure is low in tuning freedom degree and inconvenient in array expansion are solved.

The invention relates to the technical field of wireless communication, and discloses a communication antenna test system based on wireless communication, comprising an environment simulation layer which is composed of a programmable electromagnetic shielding array and independently controls each unit to work in a physical shielding or electromagnetic interference mode; the signal control layer integrates a multi-channel signal generator and a power division switch matrix and dynamically generates communication and interference signals; the digital mapping layer is used for constructing an antenna digital twin model based on an LSTM network and predicting performance attenuation under shielding / interference; and the analysis optimization layer synchronously optimizes the communication strength, the amplitude-phase consistency and the bit error rate through a multi-objective optimization engine. According to the invention, through the programmable electromagnetic shielding array and the tunable metamaterial waveguide unit, the system can dynamically simulate physical shielding and electromagnetic interference scenes, and through combination with the biological electromagnetic simulation unit, real environments such as handheld terminal holding force distribution and vehicle-mounted multipath effect can be accurately reproduced.

The present invention relates to compounds of formula (A) wherein the groups and parameters occurring have the meanings defined in claim 1, to liquid-crystalline media comprising compounds of formula (A) and to high-frequency components comprising these media, in particular for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures and electron beam controlled antennas, such as phased array antennas.

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