10 results about "Tunable metamaterials" patented technology

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 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.

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 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.