478 results about "Electromagnetic wave transmission" patented technology

The present invention relates to an electromagnetic wave transmission/reception source for a multireflector antenna of the Cassegrain type comprising longitudinal-radiation means operating in a first frequency band and an array of n radiating elements of the travelling-wave type operating in a second frequency band with the n radiating elements arranged symmetrically around the longitudinal-radiation means, the array and the longitudinal-radiation means having an approximately common phase centre, the array of n radiating elements being excited by a waveguide of polygonal cross section. The invention applies especially in satellite communication systems operating in the C-, Ku- or Ka-bands.

A system for detecting a radio frequency identification tag on an object is provided. The system includes a tunnel having a characteristic linear dimension of a characteristic cross-section and/or having a straight portion and at least one curved portion. The characteristic linear dimension is particularly designed so that the operating frequency of antennas is lower than the cutoff frequency of the tunnel. The leakage of the electromagnetic waves transmitted by the antenna array hence will be reduced. The at least one curved portion is in connection with one end of the straight portion to prevent electromagnetic waves from transmitting out of the tunnel.

The invention relates to an electromagnetic wave transmission system crossing seawater-air interface and a method thereof; the system comprises one or more underwater sound-electromagnetic wave subsurface buoys and a monitor platform; the underwater sound-electromagnetic wave subsurface buoys convert underwater sound signals of underwater device received by underwater sound sensors into electromagnetic signals at first; the electromagnetic signals are mainly received by being transmitted to the monitor platform via a lateral wave propagation path of the electromagnetic wave in a medium having a smaller conductivity; in return, the electromagnetic wave control signals transmitted by the monitor platform are transmitted to the underwater sound-electromagnetic wave subsurface buoys via similar links.

The invention discloses a photonic crystal waveguide based superefficient compact T-shaped circulator. The photonic crystal waveguide based superefficient compact T-shaped circulator comprises a T-shaped photonic crystal waveguide with three end openings; a square magneto-optical dielectric rod is arranged in the center of the T-shaped photonic crystal waveguide; four square dielectric rods are arranged at four corners in the center of the crisscrossing waveguide; angles of the four square dielectric rods are cut to form into isosceles right triangles with the length of right angle sides to be identical to that of sides of background square dielectric rods to form into corner dielectric rods; the corner dielectric rods and left parts at corresponding lattice point positions of the corner dielectric rods are coincided or not; the insertion loss of the circulator is from 0.02db to 1db and the isolation of the two end openings is larger than 14db. The photonic crystal waveguide based superefficient compact T-shaped circulator has the advantages of being small in size, high in integration level, high in electromagnetic wave transmission efficiency, beneficial to integration and efficient and allowing circuiting and being widely applied to microwave, terahertz and light communication wave bands.

The present invention discloses an absorbing and transparent integrated frequency selection surface structure. The structure comprises two absorbing frequency bands, and the structure is formed by a bending strip metal patch, a square dielectric substrate with a first type, a patch resistor, an air layer, a square dielectric substrate with a second type, a square metal patch and a square ring metal patch. The structure allows the upper and lower portions of a transparent frequency band to have the absorbing frequency bands while ensuring the low-insertion loss transparent wave of a broadband in a C wave band to take a tiny dimension to achieve electromagnetic wave transmission control of the broadband, so that the absorbing and transparent integrated frequency selection surface structure is very suitable for combination with structures such as skin, housings and protective covers with most of thicknesses to develop the electrical performances of the absorbing and transparent integratedfrequency selection surface structure; and moreover, when an incident angle is 0-30 degrees, the electromagnetic wave transmission feature is stable.

A system includes a charger and a smartphone. The charger includes a plurality of coils that transmit power through electromagnetic waves. The smartphone includes a power receiving unit, a communication unit, and a storage. The power receiving unit receives power transmitted from the coils. The communication unit communicates with a base station. The storage stores information of communication quality of the communication unit with the base station, when the power receiving unit is receiving power. The smartphone selects, from among the plurality of coils, a combination of the coils for transmitting power, based on information of the communication quality stored in the storage. The charger transmits power by the coils, based on the selection by the smartphone.

The invention provides an operation period underground pipeline pipe diameter measuring method based on a ground penetrating radar. The principle is that a ground penetrating radar electromagnetic wave reflection mechanism and a pipeline special circular shape are used for achieving underground pipeline pipe diameter detecting and interpreting under the non-excavation and non-disturbance situation when an operation period pipeline of an underground pipeline is filled with lossy dielectric. The implementation steps are that (1) on the basis that underground pipeline trend, burial depth, corresponding earth surface positions and proper radar frequency spectrum parameters are determined, ground penetrating radar detecting is carried out, and radar images of three measuring points in a radar measuring line direction above the pipeline are obtained by measuring; (2) on the basis of radar image denoising processing, electromagnetic wave single-track oscillographs corresponding to the coordinates of the three measuring points are extracted; (3) electromagnetic wave transmission time from the three measuring points to a pipe wall is determined through a single-track wave curve peak-valley value; (4) on the basis that field electromagnetic wave speed is determined, the transmission distance between the three measuring points and the pipe wall is obtained; and (5) the coordinates of the three measuring points and the electromagnetic wave transmission distance between the three measuring points and the pipe wall are used for computing the pipeline pipe diameter.

The invention relates to an electromagnetic lens, and discloses a cylindrical layered luneberg lens. The cylindrical layered luneberg lens comprises a cylinder core and n layers of drums, wherein the cylinder core comprises m nested cylinders, and the heights and the diameters of the cylinders from the cylinder at the innermost side to the cylinder at the outermost side are progressively increased; the n layers of drums surround the middle part of the cylinder at the outermost side, the height of the drum at the innermost layer is smaller than that of the cylinder at the outermost side, and the heights of the drums from the drum at the innermost layer to the drum at the outermost layer are progressively decreased and the diameters are progressively increased; the dielectric constants from the cylinder at the innermost side of the cylinder core to the drum at the outermost layer are progressively decreased; and m and n are natural numbers. The cylindrical layered luneberg lens is a rotating body and a straight line through the circle centers of the top surface and the bottom surface of the cylinder core is a rotating shaft of the rotating body. The luneberg lens with the structure is divided into multiple layers in the axial direction and the radial direction. Each cylinder and each layer of drum are prepared from materials with different dielectric constants, so that progressive decreasing changes of the dielectric constants can be achieved along the axial direction and the radial direction of the rotating shaft; and the electromagnetic wave transmission characteristics are closer to those of an ideal luneberg lens.

Provided is a plasma apparatus using a valve, which comprises a discharge device with an electrode exposed to the combustion chamber installed in a cylinder head, an antenna installed on the valve face of a valve head, an electromagnetic wave transmission line installed in a valve stem with one end connected to the antenna and the other end covered with an insulator or dielectric and extending to a power-receiving portion positioned at a location fitting into the guide hole in the valve stem, and an electromagnetic wave generator for feeding an electromagnetic waves to the power-receiving portion. At the compression stroke when the combustion chamber side opening of an intake port or an exhaust port is closed with the valve head, discharge is generated with the electrode of the discharge device and the electromagnetic waves fed from the electromagnetic wave generator through the electromagnetic wave transmission line are radiated from the antenna.

Disclosed is an electromagnetic wave transmission device with regulative and controllable magnetic field based on sub-monolayer wavelength metal grating; the device comprises a sub-monolayer wavelength metal grating and magnetoactive medium filled in the slit of the sub-monolayer metal grating; the metal part of the device and the magnetoactive medium have the same thickness, the thickness at least meets and supports the lowest-level Fabry-Perot cavity resonance demand of the designed work wavelength in the grating slit; the period and slit of the grating are shorter than the wavelength of the electromagnetic wave. By changing the size of the additional magnetic field, the propagation constant of the waveguide mode in the metal grating slit can be regulated to change the electromagnetic transmission characteristic of the device and realize the purpose of initial regulation of polarization-independent electromagnetic wave transmission spectrum and the electromagnetic wave transmission spectrum magnetic field.

The invention discloses a carbon nitride/tungsten oxide composite hollow microsphere and a preparation method thereof. The microsphere is a hollow spherical shell layer jointly formed by carbon nitride and tungsten oxide. The microsphere is prepared by adopting tungstate and a carbon nitride precursor as raw materials and glucose sintered carbon spheres as structural templates and adopting a hydrothermal method and high-temperature calcination. The carbon nitride/tungsten oxide composite hollow microsphere has the beneficial effects that the microsphere has a hollow inner cavity; the shell is simultaneously formed by carbon nitride and tungsten oxide uniformly in a certain proportion, thus showing good uniformity; the hollow microsphere has larger specific surface area; the hollow inner cavity can provide more electromagnetic wave reflection paths, thus improving the external radiation energy absorption and utilization capabilities of the material.

The invention relates to a light-emitting diode (LED) light source which produces light through a semiconductor band gap structure, in particular to an electromagnetic wave transmission structure, namely an active polarized light emission optical device with a composite micro-nano surface grating structure. The LED comprises a substrate (1), an n-type layer (2), a quantum well (3), a p-type layer (4) and a metal grating (6) and is characterized in that: a composite structure of a medium transition layer (5) and the metal grating (6) is plated or etched on the upper surface of the p-type layer (4); the refraction index of the medium transition layer meets the conditions that: n is greater than 1.0 and less than the refraction index of the p-type layer medium (4); and the transition layer is one of a thin film structure, a grating structure and an embedded structure. Due to the adoption of the structure, the transmission and extinction characteristics of the LED can be enhanced effectively; and in a period, the flatness of the side face of the grating, the duty ratio of the grating, and the range of working wavelengths are obviously improved compared with those of a conventional single-layer metal grating.

The present invention provides a dielectric leaky-wave antenna having a single-layer structure which is effective for realizing a highly efficient low-cost antenna in a quasi-millimeter wave zone in particular. This dielectric leaky-wave antenna includes a ground plane, a dielectric slab which is laid on one surface of the ground plane and forms a transmission guide for transmitting an electromagnetic wave from one end side to the other end side between itself and the ground plane along the surface, perturbations which are loaded on the surface of the dielectric slab along the electromagnetic wave transmission direction of the transmission guide at predetermined intervals and leak the electromagnetic wave from the surface of the dielectric slab, and a feed which supplies the electromagnetic wave to one end side of the transmission guide.

The invention relates to a deformable aerofoil, which solves the problems of complex structure, and large mass of the aerofoil of the existing deformable aircraft and the problems of low flying efficiency and poor air-tightness of the aircraft. The invention consists of a honeycomb sandwich matrix (1) and a cover (2); the honeycomb sandwich matrix (1) is an integral honeycomb structure of a prefabricated aerofoil shape; the cover (2) is coated on the outer surface of the honeycomb sandwich matrix (1). The aerofoil of the invention employs the honeycomb sandwich structure which has higher specific strength and specific rigidity, corrosion and fatigue resistance, excellent electric insulating performance and electromagnetic wave transmission characteristic. The honeycomb sandwich structure greatly reduces the mass of the aerofoil, and improves the flying efficiency of the aircraft. The integral honeycomb structure of a prefabricated aerofoil shape of the honeycomb sandwich matrix leads the aircraft to have better air-tightness and is a simple. The design of the honeycomb sandwich structure leads the aerofoil to be suitable for various shape changes.

Provided is a plasma apparatus using a cylinder head, which comprises a discharge device installed with an electrode exposed to the combustion chamber and installed in the cylinder head, an antenna installed to protrude from the cylinder head into the combustion chamber, a bulging portion bulging from the cylinder head to the combustion chamber so as to cover the antenna, made from insulator or dielectric, an electromagnetic wave transmission line installed in the cylinder head and with one end connected to the antenna and the other end, covered with insulator or dielectric, penetrating the cylinder head to extend to an outer wall of the cylinder head, and an electromagnetic wave generator for feeding electromagnetic waves to the electromagnetic wave transmission line. At compression stroke, discharge is generated with the electrode of the discharge device and the electromagnetic waves, fed from the electromagnetic wave generator through the electromagnetic wave transmission line, are radiated from the antenna.

The invention provides a multi-layer complementary structure terahertz band-pass filter based on a frequency selective surface, and belongs to the technical field of electromagnetic wave transmission function devices. The filter comprises an underlay dielectric substrate and two frequency selective surface layers which are arranged on upper and lower surfaces of the underlay dielectric substrate; the two frequency selective surface layers are arranged oppositely with the same structure; each frequency selective surface layer comprises N*N resonance units arranged in a matrix, and N is more than or equal to 30. The filter is high in Q value, small in insert loss, flat in passband ripple, remarkable in out-of-band rejection, simple in structure and small in size, and is convenient to adjust and control and easy to process.

The invention relates to a wireless charge receiving device, a wireless charge transmitting device and a wireless charge system. The wireless charge receiving device comprises a receiving antenna, a first meta-material convergence module and a first conversion module, wherein the first meta-material convergence module is used for converging electromagnetic wave to the receiving antenna; the firstconversion module is used for converting the electromagnetic wave received by the receiving antenna into electric energy so as to charge equipment to be charged. The wireless charge transmitting device comprises a second conversion module and a second meta-material convergence module, wherein the second conversion module is connected with a power supply for converting the electric energy into electromagnetic wave; and the second meta-material convergence module is used for converging the electromagnetic wave output by the second conversion module into planar wave and then transmitting the planar wave so as to be received by the wireless charge receiving device. In the invention, the electromagnetic wave is transmitted in a more centralized way by a transmitting end, so that the loss in anelectromagnetic wave transmission process is reduced, more electromagnetic wave energy can be received by the receiving end, the electromagnetic wave energy can be converted into electric energy as much as possible to increase charging efficiency, and the charging requirements at longer distance can be met.

A plasma processing apparatus capable of reducing the use amount of a dielectric member is provided. The plasma processing apparatus 1 includes a metal processing chamber 4 configured to accommodate therein a substrate G to be plasma-processed; an electromagnetic wave source 34 that supplies an electromagnetic wave necessary to excite plasma in the processing chamber 4; one or more dielectric members 25 provided on a bottom surface of a cover 3 of the processing chamber 4 and configured to transmit the electromagnetic wave supplied from the electromagnetic wave source 34 into the inside of the processing chamber 4, a portion of each dielectric member 25 being exposed to the inside of the processing chamber 4; and a surface wave propagating section 51 installed adjacent to the dielectric member 25 and configured to propagate the electromagnetic wave along a metal surface exposed to the inside of the processing chamber 4.