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.

Abstract: The present invention relates to a metamaterial and a metamaterial antenna. The metamaterial is disposed in a propagation direction of the electromagnetic waves emitted from a radiation source. A line connecting the radiation source to a point on a first surface of the metamaterial and a line perpendicular to the metamaterial form an angle ? therebetween, which uniquely corresponds to a curved surface in the metamaterial. Each point on the curved surface to which the angle ? uniquely corresponds has a same refractive index. Refractive indices of the metamaterial decrease gradually as the angle ? increases. The electromagnetic waves propagating through the metamaterial exits in parallel from a second surface of the metamaterial. The refraction, diffraction and reflection at the abrupt transition points can be significantly reduced in the present disclosure and the problems caused by interferences are eased, which further improves performances of the metamaterial and the metamaterial antenna.

Abstract: The present invention relates to a man-made composite material and a man-made composite material antenna. The man-made composite material is disposed in a propagation direction of a plane electromagnetic wave and convert it into a spherical wave. Reverse extensions of the spherical wave intersect at a virtual focus. A line connecting the virtual focus to a point on the second surface of the man-made composite material and a line perpendicular to the man-made composite material form an angle ? therebetween, which uniquely corresponds to a curved surface in the man-made composite material. A set formed by points having the same angle ? forms a boundary of the curved surface to which the angle ? uniquely corresponds. Each point on the curved surface to which the angle ? uniquely corresponds has a same refractive index. Refractive indices of the man-made composite material increase gradually as the angle ? increases.

Abstract: The present application relates to a harmonic oscillator. The harmonic oscillator includes a dielectric body and at least one responding unit attached onto a surface of the dielectric body, where the responding unit is a conductive structure having a geometrical pattern. The application further relates to a cavity filter having the harmonic oscillator and an electromagnetic wave device. By using the harmonic oscillator in the application, a permittivity can be effectively increased and a resonance frequency of a cavity filter can be decreased, thereby implementing miniaturization. Moreover, for an electromagnetic wave in a TM mode, a frequency can be decreased and an electromagnetic loss is not affected.

Abstract: The present invention discloses a metamaterial, a metamaterial preparation method, and a metamaterial design method. The metamaterial includes: at least one layer of substrate and multiple artificial microstructures, where the metamaterial includes an electromagnetic area, and an artificial microstructure in the electromagnetic area generates a preset electromagnetic response to an electromagnetic wave that is incident into the electromagnetic area. Due to a simple making process, a low processing cost, and simple craft precision control, the metamaterial according to the present invention may replace various mechanical parts that have complicated curved surfaces and need to have a specific electromagnetic modulation function, and may also be attached onto various mechanical parts that have complicated curved surfaces to implement a desired electromagnetic modulation function.

Abstract: The present invention provides a reflective array surface. The reflective array surface includes a functional board that is configured to perform beam modulation on an incident electromagnetic wave and a reflection layer that is disposed on one side of the functional board and is configured to reflect an electromagnetic wave, where the functional board includes two or more functional board units and the reflection layer includes reflection units, where the number of reflection units corresponds to the number of functional board units, where the functional board unit and a reflection unit corresponding to the functional board constitute a phase-shifting unit that is used for phase shifting.

Abstract: The present invention relates to a man-made composite material. The man-made composite material is divided into a plurality of regions. A plane electromagnetic wave is incident on a first surface and exits in the form of a spherical wave from a second surface of the man-made composite material opposite to the first surface. Reverse extensions of the exiting electromagnetic wave intersect with each other at a virtual focus of the man-made composite material. A line connecting the virtual focus to a point on the top surface of the ith region and a line perpendicular to the man-made composite material form an angle ? therebetween, which uniquely corresponds to a curved surface in the ith region. A set formed by points on the top surface of the ith region that have the same angle ? forms a boundary of the curved surface to which the angle ? uniquely corresponds.

Abstract: The present invention discloses a light signal-based information processing method and device. The method includes: receiving trigger information; extracting corresponding information according to the trigger information; sending the extracted information in a form of a visible light signal, or receiving a visible light signal; obtaining modification of user information and user information according to the visible light signal; and modifying stored user list information according to the modification of user information and the user information, so that an authorization information list of a light signal receiving device can be modified conveniently no matter whether the light signal receiving device is fixed in a specific system.

Abstract: The present invention relates to an antenna unit, including a dielectric substrate and an antenna conductor attached to the dielectric substrate, where a maximum gain direction of the antenna unit is consistent with an extension direction of a surface of the dielectric substrate. The present invention also relates to an antenna assembly with the antenna unit, a multi-antenna assembly, and a wireless connection device with the antenna unit, the antenna assembly or the multi-antenna assembly. The antenna unit of the present invention has high directivity, and has advantages of broad bands, high gains, and easy commissioning, so that both the multi-antenna assembly and the wireless connection device have high performance.

Abstract: The present invention provides an optical signal processing device and a decoding method for an optical signal reception control device. The optical signal processing device includes one of the following: a power control apparatus, where the power control apparatus is configured to control power-on and power-off of a power supply according to an optical signal, or, a clock apparatus, where the clock apparatus is configured to store time of opening and closing a door; or, a charging apparatus, where the charging apparatus is configured to charge an optical signal transmitting apparatus. The present invention can control power-on and power-off of a power supply automatically and save electric energy effectively.

Abstract: A manufacturing method of a metamaterial having a spatial geometric structure includes: step 1, making a first dielectric enclosure having a spatial geometric shape; step 2, making a dielectric patch having at least one conductive geometric structure; step 3, attaching at least one dielectric patch to a part or all of a surface of the first dielectric enclosure, so that the dielectric patches are spliced together to form at least one dielectric patch layer having the spatial geometric shape; and step 4, combining the first dielectric enclosure and the dielectric patch layer together.

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 disclosure relates to an antenna reflector phase correction film and a reflector antenna. The antenna reflector phase correction film includes a first substrate, a second substrate, and multiple artificial microstructures disposed between the first substrate and the second substrate, the artificial microstructures are wires made of electrically conductive materials, and an electromagnetic wave, emergent after being reflected by an antenna reflector attached with the antenna reflector phase correction film, has an equiphase surface. According to the disclosure, the antenna reflector phase correction film has specific refractive index distribution internally, so that a surface emergent phase of a reflector can be corrected after attaching onto a surface of a conventional reflector, a phase error caused due to installation or processing is improved, a complete flat emergent equiphase is obtained, and then a far-field performance (such as a higher gain) is improved.

Abstract: The present invention discloses a visible light encryption method, a decryption method, a communication device and a communication system. The method includes: receiving a visible light signal from a transmit end, where the visible light signal is encrypted at the transmit end by using a key; and obtaining the key, and decrypting the visible light signal according to the key, where the obtaining the key includes: obtaining a key corresponding to a state of a state machine of a receive end; or, obtaining indication information according to the visible light signal and obtaining the key according to the indication information, where the indication information is used to obtain the key. The present invention solves a problem of decryption failure in visible light encryption and decryption, and improves accuracy of decryption.

Abstract: The present invention provides an artificial microstructure employed in an artificial electromagnetic material. The artificial microstructure includes a first segment, a second segment, and a third segment. The first segment is parallel to the second segment, and the third segment is connected between the first segment and the second segment. The artificial electromagnetic material has a special electromagnetic effect. The artificial electromagnetic material can be applied to various electromagnetic application systems instead of the typical electromagnetic material.

Abstract: The disclosure discloses a wide-frequency wave-absorbing metamaterial, which comprises a plurality of layers of substrates and microstructures respectively arranged on the substrates at different layers. The wave-absorbing frequency band of the wide-frequency wave-absorbing metamaterial is relatively wide. The disclosure further discloses an electronic device and a method for obtaining a wide-frequency wave-absorbing metamaterial. By using the foregoing manner, the disclosure can enable a wave-absorbing metamaterial to significantly increase a wave-absorbing bandwidth based on a relatively good electromagnetic wave absorbing effect.

Abstract: A Cassegrain-type metamaterial antenna, includes: a metamaterial main reflector having a central through-hole, a feed source disposed in the central through-hole, and a sub-reflector disposed in front of the feed source, where an electromagnetic wave radiated by the feed source is emerged in a form of a plane wave after being reflected by the sub-reflector and the metamaterial main reflector in sequence; the metamaterial main reflector includes: a first core layer and a first reflection layer disposed on a rear surface of the first core layer, where the first core layer includes at least one first core layer lamella, and the first core layer lamella includes: a first base material and multiple first conductive geometric structures disposed on the first base material; and a far focus of the sub-reflector coincides with a phase center of the feed source. A paraboloid is replaced with a lamellar metamaterial main reflector.

Abstract: The present disclosure relates to a metamaterial for diverging an electromagnetic wave, which comprises at least one metamaterial sheet layer. Refractive indices of the metamaterial sheet layer are distributed in a circular form with a center of the metamaterial sheet layer, and the refractive indices remain unchanged at a same radius and increase gradually with the radius. The present disclosure changes electromagnetic parameters at each point of the metamaterial through punching or by attaching man-made microstructures so that the electromagnetic wave can be diverged after passing through the metamaterial. The metamaterial of the present disclosure features a simple manufacturing process and a low cost, and is easy to be implemented. Moreover, the metamaterial of the present disclosure has small dimensions and does not occupy a large space, so it is easy to miniaturize apparatuses made of the metamaterial of the present disclosure.

Abstract: The disclosure relates to a harmonic oscillator and a preparation method thereof, a filtering device and an electromagnetic wave device. The harmonic oscillator includes at least one dielectric slab and response units attached on one surface of the at least one dielectric slab, where the response units are structures manufactured by conductive material and provided with geometric patterns. According to the technical solution of the disclosure, the filtering device and the electromagnetic wave device with the harmonic oscillator are good in structure stability. Swinging of a harmonic oscillator sheet layer is low in loss. The Q value of the harmonic oscillator prepared by the disclosure is high; and loss of a resonant cavity, the filtering device and a microwave device with the harmonic oscillator is obviously reduced.

Abstract: Embodiments of the present invention provide a method and system of encryption, decryption, and encryption and decryption based on visible light communication. A transmit end performs a logical operation on an original data signal and a pseudocode signal varying with a unit interval to obtain a scrambling code signal, and sends the scrambling code signal in a form of a visible light signal. A receive end receives the visible light signal sent by the transmit end, and converts the visible light signal into a digital signal; and decodes the digital signal and a pseudocode signal varying with a unit interval, so as to obtain the original data signal. The visible light signal transmitted between the transmit end and the receive end is not original data, but a scrambling code signal varying with a unit interval, thereby improving security of the photonic Internet of Things.