Abstract: The present application relates to error retransmission mechanism-included methods, apparatuses, and systems for transmitting and receiving a visible light signal. The transmitting method includes the following steps: during transmission of a visible light signal, when an emitter executes signal transmission on an error sensitive level each time, reading an execution duration of the emitter; comparing the execution duration with a signal duration range; when the execution duration does not fall within the signal duration range, performing signal retransmission; and when the execution duration falls within the signal duration range, continuing signal transmission.

Abstract: The present application discloses an authentication system, and a transmit terminal, a receive terminal, and a right authentication method of same. The receiver externally propagates, by using the information transmit module, an identification code information set corresponding to the receiver. After receiving the identification code information set, the transmitter firstly performs a first right authentication on rights of the transmitter. The transmitter allows itself to transmit a light signal of an identification code of the transmitter only after the authentication is passed, thereby reducing a security risk caused by uncontrolled transmission of the light signal of the identification code of the transmitter by the transmitter. After the transmitter transmits the light signal of the identification code of the transmitter, the receiver performs a second right authentication on the received light signal. In this way, security of the authentication system is further improved.

Abstract: The present invention provides a signal transmission method and device. The device includes: a transmitting device, configured to transmit a first signal to an opposite terminal; and a receiving device, configured to receive a second signal transmitted by the opposite terminal, where a frequency of the first signal is different from a frequency of the second signal, and the frequency of the first signal and/or the frequency of the second signal are/is in a frequency band of visible light. The present invention resolves a problem in a related technology that poor reliability of uplink and downlink signal transmission is caused when signals of a same frequency are used for uplink and downlink transmission, and provides a beneficial effect of improving reliability of uplink and downlink signal transmission.

Abstract: A front feed satellite television antenna includes a metamaterial panel. The metamaterial panel includes a core layer and a reflective panel. The core layer includes a core layer lamella which further includes a circular area and multiple annular areas distributed around the circular area. Within the circular area and the annular areas, refractive indexes are identical at a same radius, and within the respective areas, the refractive indexes decrease gradually as radius increases. The minimum refractive index of the circular area is less than the maximum the refractive index of the annular area adjacent thereto. For two adjacent annular areas, the minimum refractive index of the annular area at the inner side is less than the maximum refractive indexes of the annular area at the outer side. The metamaterial panel can replace conventional parabolic antenna, thus facilitating manufacturing and processing, and further reducing costs.

Abstract: An artificial electromagnetic material is provided. The artificial electromagnetic material includes at least one material sheet. Each material sheet includes a laminary substrate and a plurality of artificial microstructures attached to the substrate. The substrate is made from transparent material. Because the substrate is made from transparent material, therefore the artificial electromagnetic material is capable of generating responses to visible light wave and convergence, divergence, deflection of visible light wave and so on can be achieved.

Abstract: The present disclosure discloses an antenna device, which comprises an array antenna and a power divider. The array antenna comprises a plurality of antenna units, and each of the antenna units comprises a conductive sheet engraved with a groove topology pattern, conductive feeding points and a feeder line. The power divider is adapted to divide a baseband signal into a plurality of weighted signals and then transmit the weighted signals to the antenna units arranged in an array via the conductive feeding points respectively. By arraying the antenna units and using the beam forming method, the directionality of the antenna can be designed as needed through phase superposition between the antenna units; and then, a reflective metal plate is provided on the back side of the antenna so that a back lobe of the antenna is compressed. In this way, the miniaturized antenna array can obtain a high directionality.

Abstract: The present invention provides an artificial microstructure. The artificial microstructure includes at least three split rings. The at least three split rings surround and embed in turn. Each split ring is formed by a wire which is made of conductive material, with two terminals of the wire towards each other to form an opening of the corresponding split ring. The present invention also provides an artificial electromagnetic material using the artificial microstructure. The artificial electromagnetic material with the artificial microstructure can achieve the function of broadband wave-absorbing.

Abstract: An artificial electromagnetic material includes at least one material sheet. Each material sheet includes a substrate and a plurality of artificial microstructures attached to the substrate. Each substrate is virtually divided into multiple of substrate units arranged into an array. A pair of artificial microstructures is attached to each substrate. The pair of artificial microstructures includes a first artificial microstructure and a second artificial microstructure with different shapes. The dielectric constant of artificial electromagnetic materials gradually increases from zero in a certain frequency range, therefore the material has a low dielectric constant in the certain frequency range and can meet some needs of special situation.

Abstract: Disclosed is a Cassegrain microwave antenna, which comprises a radiation source, a first metamaterial panel used for radiating an electromagnetic wave emitted by the radiation source, and a second metamaterial panel having an electromagnetic wave convergence feature and used for converting into plane wave the electromagnetic wave radiated by the first metamaterial panel. Employment of the principle of metamaterial for manufacturing the antenna allows the antenna to break away from restrictions of conventional concave lens shape, convex lens shape, and parabolic shape, thereby allowing the shape of the Cassegrain microwave antenna to be panel-shaped or any shape as desired, while allowing for reduced thickness, reduced size, and facilitated processing and manufacturing, thus providing beneficial effects of reduced costs and improved gain effect.

Abstract: An impedance matching component is disclosed. The impedance matching component is disposed on and closely attached to a first side surface of a function dielectric sheet.

Abstract: The present invention relates to a wave-absorbing metamaterial, comprising a substrate which is provided with two opposite lateral surfaces, wherein a plurality of periodically arranged artificial metal microstructures are attached on at least one of the two opposite lateral surfaces; when an electromagnetic wave having an incident direction vertical to the two opposite lateral surfaces of the substrate is transmitted to the wave-absorbing metamaterial, a relative permittivity of the metamaterial is substantially equal to a relative magnetic conductivity of the metamaterial.

Abstract: A handshake synchronization restoration method and system based on visible light communication are provided. The method includes: after a transmitting end in which a state machine varies with unit time is powered on again, transmitting in the form of a visible light signal, to a receive and control system, a status reset signal which varies with unit time, wherein the receive and control system comprises one or multiple receiving ends; and receiving, by the receive and control system, the visible light signal, and when it is determined that the received visible light signal is a status reset signal, adjusting status of a state machine of a receiving end to a state indicated by the status reset signal. Status synchronization with the transmitting end is restored, avoiding a case in which the transmitting end is asynchronous with the receiving end after encountering power outage and being powered on again.

Abstract: A metamaterial for deflecting an electromagnetic wave is disclosed, which comprises a functional layer. The functional layer comprises a plurality of sheet layers parallel to each other, and each of the sheet layers comprises a sheet-like substrate and a plurality of man-made microstructures arranged in an array on the sheet-like substrate. The sheet-like substrate comprises a plurality of unit blocks, and each of the man-made microstructures and a corresponding one of the unit blocks occupied thereby form a unit cell. Refractive indices of the unit cells arranged in a first direction in each of the sheet layers decrease gradually. Each of the unit cells has an anisotropic electromagnetic parameter. Through use of the metamaterial of the present disclosure, deflection of the electromagnetic wave can be achieved.

Abstract: The present disclosure relates to an electromagnetically transparent metamaterial, which comprises a substrate and a plurality of man-made metal microstructures arranged periodically inside the substrate. When an electromagnetic wave propagates through the metamaterial, each of the man-made metal microstructures is equivalent to two identical two-dimensional (2D) circuits, which are placed respectively in a direction perpendicular to an incident direction of the electromagnetic wave and in a direction parallel to the incident direction of the electromagnetic wave, and each of which comprises an inductor branch and two identical capacitor branches that are symmetrically connected in parallel with the inductor branch. The 2D circuits are associated with a waveband of the electromagnetic wave so that both a dielectric constant and a magnetic permeability of the metamaterial are substantially 1 when the electromagnetic wave propagates through the metamaterial.

Abstract: A handshake synchronization method and system based on visible light communication are provided. The method includes: connecting, by a transmitting end, in which a state machine varies with unit time, to a receiving end, the status of a state machine of the receiving end being synchronized with the status of the state machine of the transmitting end; using, by the transmitting end, a pseudocode signal which varies with unit time, to scramble an original signal and a pilot optical signal, and sending, in the form of a visible light signal, the scrambled signal obtained by scrambling; and receiving, by the receiving end, the visible light signal, identifying the scrambled signal of the current period of time by using a pilot optical signal, and decrypting the original signal according to the scrambled signal. Since a visible light signal which is transmitted between a transmitting end and a receiving end is not an original signal, the security of a photonic Internet of Things is improved.

Abstract: The present invention discloses a Cassegrain satellite television antenna comprising a metamaterial plate. The metamaterial plate comprises a core layer. The core layer comprises core sublayers. Each core sublayer comprises a circular area and a plurality of annuli distributed around the circular area. According to the Cassegrain satellite television antenna of the present invention, the traditional parabolic antenna is replaced with a sheet-like metamaterial plate which is easier to process and has a lower cost. In addition, the present invention also provides a satellite television receiving system equipped with the above-mentioned Cassegrain satellite television antenna.

Abstract: The present invention provides an artificial microstructure including a first metal wire, a second metal wire parallel to the first metal wire, at least one first metal wire branch and at least one second metal wire branch. The at least one first metal wire branch and the at least one second metal wire branch are distributed in an interlacement arrangement. One end of the at least one first metal wire branch is connected to the first metal wire; the other end is a free end facing towards the second metal wire. One end of the at least one second metal wire branch is connected to the second metal wire, and the other end of the at least one second metal wire is a free end facing towards the first metal wire. The present invention also discloses a metamaterial with the artificial microstructures.

Abstract: The present invention relates to an antenna based on a metamaterial and a method for generating an operating wavelength of a metamaterial panel. The antenna comprises a radiation source, and a metamaterial panel capable of converging an electromagnetic wave and operating at a first wavelength. The metamaterial panel is adapted to convert the electromagnetic wave radiated from the radiation source into a plane wave and to enable the antenna to simultaneously operate at a second wavelength and a third wavelength which are smaller than the first wavelength and are different multiples of the first wavelength. The present invention further provides a method for generating an operating wavelength of a metamaterial panel for use in the aforesaid antenna. These improve the convergence performance and reduce the volume and size of the antenna.

Abstract: The present disclosure discloses a unipolar antenna, a wireless access apparatus and a wireless router. The unipolar antenna of the present disclosure comprises a medium substrate, as well as a power feeding point, a feeder line and a metal structure that are disposed on a surface of the medium substrate. The feeder line is connected to the power feeding point, and the feeder line and the metal structure are coupled with each other. The unipolar antenna, the wireless access apparatus and the wireless router of the present disclosure can transmit or receive electromagnetic signals of two or more different wavebands simultaneously so that they can operate within multiple operation wavebands in a single-frequency mode and operate within different operation wavebands simultaneously in a multi-frequency mode. Thereby, the antenna can be miniaturized on the premise of satisfying the performance requirements of the communication devices.

Abstract: Disclosed is a front feed satellite television antenna comprising a metamaterial panel. The metamaterial panel comprises a core layer and a reflective panel. The core layer comprises a core layer lamella. The core layer lamella comprises a circular area and multiple annular areas distributed around the circular area. Within the circular area and the annular areas, refractive indexes are identical at a same radius, and within the respective areas of the circular area and of the annular areas, the refractive indexes decrease gradually as the radius increases. The minimum value of the refractive indexes of the circular area is less than the maximum value of the refractive indexes of the annular area adjacent thereto. For two adjacent annular areas, the minimum value of the refractive indexes of the annular area at the inner side is less than the maximum value of the refractive indexes of the annular area at the outer side.