10 results about "Metamaterial antenna" patented technology

The invention relates to the field of metamaterial antennas, and provides a directional radiation antenna structure with adjustable power, which aims at solving the problem that the existing beam control or directional diagram reconstruction method generally depends on a mechanical system, a phased array or a reconfigurable metasurface and lacks the capability of dynamically and continuously adjusting the radiation power of a directional antenna on the premise of not changing the beam shape. One end of the metal waveguide A fixes the SMA connector, and the other end is connected with the metal waveguide B; the metal waveguide B is of a cavity structure, an electric regulation and control structure is arranged in an inner cavity of the metal waveguide B. A plurality of openings distributed at equal intervals are formed in the outer side of the emergent face of the metal waveguide C. The resonance characteristic of the electric opening resonance ring is changed by changing capacitance of the variable capacitance diode. The metamaterial antenna with the near-zero dielectric constant can keep high directionality and a stable radiation pattern, and the radiation power of the metamaterial antenna with the near-zero dielectric constant can be remarkably enhanced.

This invention relates to the field of radar-communication integration, specifically to a radar-communication integrated system with a metamaterial antenna architecture and a waveform optimization method. It utilizes a dynamic metamaterial antenna pre-encoder to fit an optimal pre-encoder for the dynamic metamaterial antenna, ultimately obtaining the optimal pre-encoder. This system optimizes radar transmission beamforming performance while satisfying communication user quality and constant power mode constraints. This invention considers dynamic metamaterial antennas, which saves costs and occupies a small area. The radar beam performance is similar to that of a phase-shifter-based hybrid antenna structure. Under reasonable communication quality constraints, the radar beam of the radar-communication integrated system with the dynamic metasurface antenna architecture approaches the performance of a radar beam without spectrum sharing.

The invention discloses a ceramic-based metamaterial antenna housing based on topological optimization and a design method of the ceramic-based metamaterial antenna housing. The invention discloses a ceramic-based metamaterial antenna housing based on topological optimization. The ceramic-based metamaterial antenna housing comprises a plurality of ceramic unit cell units which are periodically arranged above a corresponding antenna area of the antenna housing; each ceramic unit cell unit is composed of M * N ceramic cuboid columns, and the size of each ceramic unit cell unit on the plane of the radome is smaller than the wavelength corresponding to the highest frequency of the stop band of the radome; the height of each ceramic cuboid column in each ceramic unit cell unit is obtained through optimization based on a topological optimization model, and the optimization target of the topological optimization model is that the passband wave transmission rate of the antenna housing is maximized and the stopband wave transmission rate is minimum. According to the technical scheme of the embodiment of the invention, the antenna housing which can work in a severe environment and meets the electromagnetic performance requirement of an antenna is provided.

The utility model discloses an antenna housing, a plurality of metamaterial units are arranged in the antenna housing, each metamaterial unit comprises at least one microstructure, each microstructure is a regular polygon metal sheet, and a notch is formed in the edge of each metal sheet towards the center point. The antenna housing provided by the utility model has the characteristics of transmitting P-C wave bands and reflecting Ku-Ka wave band electromagnetic waves, and has low insertion loss and good angle stability and polarization stability; the wave-transparent performance in a passband is good, the signal loss is small, the stopband performance is good, and almost total reflection is realized; the octagonal arrangement mode of the frequency selective surface is utilized, so that the unit is more compact, the frequency generated by grating lobes and surface wave singularity is improved, and the frequency selective surface has a wider working frequency band; the single-layer frequency selective surface is simple in structure and low in cost, and errors can be caused by processing different from a multi-layer structure.

The embodiment of the invention provides a large-angle low-pass high-resistance metamaterial antenna housing. The antenna housing structurally comprises a first base material layer, a first prepreg layer, a first core material layer, a second prepreg layer, a second base material layer, a third prepreg layer, a second core material layer, a fourth prepreg layer and a third base material layer which are sequentially stacked from outside to inside. A first microstructure is arranged on the first base material layer, a second microstructure is arranged on the second base material layer, and a third microstructure and a fourth microstructure are respectively arranged on the upper surface and the lower surface of the third base material layer. The first microstructure, the third microstructure and the fourth microstructure are all band-stop microstructures, and the second microstructure is a band-pass microstructure. According to the antenna housing, in-band broadband wave transmission under the large incident angle is achieved, meanwhile, out-of-band rapid cut-off is achieved so as to reduce the overall radar cross section (RCS), and therefore the requirements of a high-performance communication detection system and stealth are met.

A radio-frequency (RF) antenna and method for using the same are disclosed. In some embodiments, an antenna includes an array of RF radiating antenna elements, a plurality of RF antenna element driving circuits coupled to the array of RF radiating antenna elements to supply tuning voltages to the RF radiating antenna elements, and one or more metal power planes, each of the one or more metal power planes coupled to supply a common voltage to two or more of the plurality of RF antenna driving circuits.

The invention discloses an unmanned aerial vehicle data security encryption and remote transmission management system and method and a medium, and relates to the field of unmanned aerial vehicle data security protection and remote transmission. The intelligent sensing and edge computing module integrates multiple sensors, and adopts a heterogeneous architecture and a YOLOv8 model; the dynamic encryption processing module adopts SM4, chaos and SM9 cryptographic encryption, and supports three sensitive levels; the self-organizing destroy-resistant communication network module constructs a LORAMesh network and is matched with a phased-array antenna to switch an unmanned aerial vehicle cluster relay; the physical unclonable key management module uses PUF features and a block chain smart contract; the anti-interference receiving and intelligent reconstruction module is provided with a metamaterial antenna and 3D-CNN reconstruction; the active defense and situation awareness module deploys a GAN honeypot and CNN monitoring. The method is high in encryption speed, safe in key management, high in interference resistance, low in delay rate and capable of intelligently processing data, reinforcing hardware safety and reducing power consumption, and provides efficient and safe support for related fields.

An antenna array utilizing a ground protection ring and a metamaterial structure is disclosed. In certain embodiments, the antenna array includes a plurality of antenna elements, where each antenna element is identical. The antenna element includes an upper surface that includes a patch antenna and a ground protection ring. A reactive impedance surface (RIS) layer is disposed below the upper surface and includes a metamaterial structure. The metamaterial structure is configured to provide inductance to the patch antenna, thereby allowing the patch antenna to be smaller than otherwise possible. In some embodiments, the metamaterial structure includes a hollow square frame. An antenna array constructed using such antenna elements has less coupling than a conventional antenna array, thereby resulting in better performance. Furthermore, such a new antenna array also requires less space than a conventional antenna array.

This invention relates to a microstrip slot-fed broadband metadielectric resonator antenna, belonging to the field of metamaterial antenna technology. It addresses the problem of designing a microstrip slot-fed broadband metadielectric resonator antenna with wide impedance bandwidth, flat gain curve, and simple structure. The antenna receives an RF signal from the excitation port, which is then conducted through a rectangular microstrip line to a rectangular slot. The rectangular slot then conducts the RF signal to a rectangular metadielectric resonator radiator array. Multimode resonance is generated by the coupling between the rectangular metadielectric resonator radiator elements, thereby increasing the impedance bandwidth. The signal radiates from the top of the rectangular metadielectric resonator radiator array. The antenna exhibits a flat gain curve, superior performance, and advantages such as simple structure and easy fabrication.

The embodiment of the invention provides a large-angle wave-transparent metamaterial antenna housing, which comprises a first prepreg layer, a second prepreg layer, a core material layer, a first microstructure layer and a second microstructure layer, the structures of the antenna housing are sequentially provided with a first microstructure layer, a first prepreg layer, a core material layer, a second prepreg layer and a second microstructure layer from outside to inside in a lamination sequence; the first microstructure layer and the second microstructure layer are both band-stop microstructure layers. According to the antenna housing, in-band broadband wave transmission under the large incident angle is achieved, meanwhile, out-of-band rapid cut-off is achieved so as to reduce the overall radar cross section (RCS), and therefore the requirements of a high-performance communication detection system and stealth are met.