10 results about "Transmission amplitude" patented technology

The application discloses a kind of diffractive microstructure library management system, method, storage medium and optical element applied to the field of diffractive optical element design, the transmission amplitude and phase of unit structure under different polarization states are simulated / measured, and polarization sensitivity index is calculated, the structure library index with "exclusive area / turning rule" is established, so that the unit structure that meets can be preferentially selected when generating prescription phase height field, to reduce the phase error and ghost risk caused by polarization, and output the data packet with version number, hash signature and audit field for cross-site replication, by introducing quantitative polarization sensitivity index, and actively screening unit structure that meets polarization sensitivity index meets set threshold in design stage, fundamentally reduce the dependence of diffractive optical element on incident light polarization state, so as to effectively reduce phase error, ghost and image quality degradation.

This invention discloses a terahertz biosensing metasurface based on the Jones singularity, belonging to the field of terahertz metasurface technology. The metasurface comprises two orthogonally oriented metal open-loop resonator arrays and a dielectric spacer layer between the two layers. By making the upper layer's opening width L1 different from the lower layer's characteristic dimension L3, the two orthogonal polarization modes have different ohmic loss rates. Simultaneously, the interlayer near-field coupling strength is controlled by an in-plane displacement L2. When the combination of these two factors causes a cross-polarized transmission component of the Jones transmission matrix under circularly polarized basis vectors to drop to zero at the target frequency, the system is locked at the Jones singularity. This invention utilizes the square root topological enhancement of the second-order branch point, and the device exhibits highly sensitive intrinsic transmission amplitude splitting at the singularity to weak dielectric perturbations, making it suitable for label-free, ultrasensitive biosensing.

The invention relates to the field of automatic detection of tea processing, and provides a tea withering detection method and system based on ultrasonic attenuation, and the method comprises the steps: synchronously collecting echo signals, position parameters and environment temperature, generating a stacking thickness field matrix through thermodynamic sound velocity compensation and cubic spline interpolation, and outputting porosity correction according to a rheological power law function; a transmission acoustic signal is collected by a time division multiplexing mechanism, a transmission amplitude field and a propagation time field are constructed through Hilbert transform and cross-correlation time delay estimation, average sound velocity distribution is constructed, and a physiological attenuation coefficient and a damage index are generated in combination with porosity correction; a composite feature vector is constructed, and the local water content and the cell wall breakage rate are solved through a space-time gradient coupling network; and generating a global regulation and control instruction in combination with the spatial weighted average moisture content and the accumulation thickness field matrix, and generating a fixed-point targeted raking instruction in combination with the abnormal displacement coordinates. According to the method, acoustic inversion and multi-dimensional closed-loop correction are fused, and digital perception and intelligent targeted regulation and control of the tea leaf withering process are constructed.

The invention discloses a multiband tunable electromagnetic induction-like transparent metamaterial and application, and belongs to the technical field of electromagnetic induction transparent metamaterials. The multiband tunable electromagnetic induction-like transparent metamaterial comprises a plurality of periodically arranged structural units, each structural unit comprises a substrate, a graphene metasurface is arranged on the upper surface of each substrate, and each graphene metasurface comprises a rectangular resonator, a first split-ring resonator and a second split-ring resonator. The second split-ring resonator is located between the first split-ring resonator and the rectangular resonator, and the bottom of the second split-ring resonator is nested in the first split-ring resonator; the rectangular resonator, the first opening resonance ring and the second opening resonance ring generate three similar electromagnetic induction transparent windows in the terahertz wave band through the near-field coupling effect. According to the multiband tunable electromagnetic induction-like transparent metamaterial and the application, three high-transmittance transparent windows are generated in a terahertz wave band, a remarkable slow light effect is achieved, and the transmission amplitude, the center frequency and the slow light effect of the transparent windows are adjusted by adjusting the Fermi level of graphene.

The application discloses an antenna and a wireless communication device. The antenna comprises a first metal body, the first metal body comprises N slots, and the N slots are determined according to a first parameter set. The first parameter set comprises at least one of the following parameters: a working frequency band of the antenna, a lowest-order waveguide mode corresponding to the N slots, a height H of the N slots, a side length P of the N slots, a filling medium, a desired transmission amplitude and a phase. The N slots correspond to N antenna units. According to the scheme, the antenna has a simple structure, is easy to process and install, and has good transmission performance.

A method of adapting charging of an accessory device, comprising: transmitting a first transmission signal at a first transmission amplitude; measuring a received load of the first transmission signal; and if the charging device does not receive a response signal to the first transmission signal, transmitting a second transmission signal at a second transmission amplitude different from the first transmission amplitude.

This invention discloses a circularly polarized decoupled metasurface based on a two-layer C4 structure and its design method. The metasurface consists of a substrate, a bottom subwavelength structural unit, an intermediate dielectric layer, and a top structural unit, with both the top and bottom layers using high-refractive-index materials. Based on the principle of symmetry breaking, this invention constructs a two-layer physical system with rotational symmetry while simultaneously breaking mirror symmetry, inducing the system's circularly polarized eigenresponse, thus overcoming the physical limitations of traditional single-layer structures on spin-state manipulation. During the design process, this invention combines optical simulation tools and multi-objective optimization algorithms to collaboratively optimize the spatial distribution and geometric parameters of the two-layer structure, achieving precise control over the transmission amplitude and phase of the circularly polarized component. This metasurface can achieve continuous linear polarization angle rotation of incident linearly polarized light over a wide angle range, while maintaining efficient transmission and extremely low exit ellipticity within the target wavelength band.

The invention discloses a multi-beam digital transmission metasurface design method adaptive to direct communication of the Internet of Vehicles. The metasurface works in a 5.9 GHz frequency band and is composed of 40 * 40 double-C-shaped slot loading units, 2-bit transmission phase coding is achieved by adjusting inner-layer slot parameters of the units, and the transmission amplitude is superior to-2dB. According to the design, a quadrant partition beam forming method is adopted, an array is divided into four sub-regions, superposition codes of a focusing phase and a specific deflection phase are loaded respectively, and therefore four symmetrically-distributed high-gain beams are synchronously generated. Simulation results show that main beams of the array respectively point to azimuth angles of 45 degrees, 135 degrees, 225 degrees and 315 degrees, pitch angles are all 30 degrees, the maximum gain reaches 14.2 dBi, the narrow-beam and low-sidelobe characteristics are achieved, and the problem of efficient coverage of one source and multiple directions in an Internet of Vehicles scene is effectively solved.

This invention discloses a terahertz amplitude and phase modulator unit based on vanadium dioxide, mainly solving the problem of mutual interference between modulation modes in amplitude and phase modulation in existing technologies. It includes a substrate (1) and a bright-mode dicing line (2), a dark-mode opening ring (3), and two rectangular switches (4, 5) located on the substrate. The first rectangular switch (4) is located on the opening of the dark-mode opening ring, either closing the opening or filling the internal space of the opening ring. The second rectangular switch (5) is located between the bright-mode dicing line and the dark-mode opening ring, and is connected to the long side of the bright-mode dicing line. Its top is flush with the top of the first rectangular switch. The distance between the bright-mode dicing line and the dark-mode opening ring is adjustable within a range less than three times the linewidth of the bright-mode dicing line. This invention can achieve amplitude and phase modulation without interference at the same operating frequency, and has minimal interference to the transmission amplitude and phase characteristics of adjacent frequency bands. It can be used for terahertz communication and 6G communication.

The invention provides a joint transmission optimization method and device combining coupling phase shift and hardware damage, and the method comprises the steps: obtaining the communication data of a reflection intelligent metasurface, the communication data comprises first channel data between the reflection intelligent metasurface and a base station and second channel data between the reflection intelligent metasurface and a user; adopting a reinforcement learning algorithm, wherein the reinforcement learning algorithm comprises a hardware damage constraint and a coupling phase movement constraint; the reinforcement learning algorithm comprises a plurality of update rounds, in each update round, a transmission matrix and a reflection matrix are calculated based on a transmission phase shift, a reflection phase shift, a transmission amplitude and a reflection amplitude in a current action, a reward function is calculated based on the transmission matrix, the reflection matrix, a hardware damage value and a current state, and the state is updated based on the reward function; and configuring a reflection intelligent metasurface for the action in the last update round in the reinforcement learning algorithm.