144 results about "Dielectric rods" patented technology

The invention provides a Ku/Ka frequency band circularly polarization integrated receiving and transmitting feed source antenna applied to antenna systems, such as a paraboloid antenna and the like, in satellite communication. The antenna adopts a coaxial nested compact structure, and is applied to Ku frequency band and Ka frequency band at the same time. The basic structure of a feed source comprises a circular waveguide, on which a pointed cone shaped dielectric rod is loaded, a flange, a coaxial waveguide, a symmetrical SMA connector pair, a circular polarizer and an orthogonal mode coupler, wherein the feed source in the Ka frequency band is applied to dual circular polarization, has rotary symmetrical radiation directional diagrams, the circularly polarization axial ratio in Ka double band is smaller than minus 2dB, and the transmitter-receiver isolation is smaller than minus 70dB; and the feed source in the Ku frequency band is applied to dual circular polarization, has rotary symmetrical radiation directional diagrams, a cross polarization level smaller than minus 40dB, and good transmitter-receiver isolation and reflection loss.

The invention discloses a lightweight dielectric-filled multi-beam cylindrical Luneberg lens antenna applied to multi-beam directional communication and beam scanning. The basic structure of the lightweight dielectric-filled multi-beam cylindrical Luneberg lens antenna comprises a cylindrical Luneberg dielectric lens and a curved array (3), wherein the curved array (3) comprises a plurality of E-shaped microstrip antenna feed sources; the cylindrical Luneberg dielectric lens between two parallel metal plates (4) is divided into three layers, namely an outer layer lens (11), a middle layer lens (12) and an inner layer lens (13); the three layers all adopt lightweight foam with a low dielectric constant as a substrate material; holes are formed in the substrate material and are filled with dielectric rods with high dielectric constants; the holes in the three lenses sequentially become dense from the outside to the inside; and the curved array (3) is fixed between the two parallel metal plates (4). The holes are formed in the substrate material with the low dielectric constant and are filled with a dielectric material with a high dielectric constant, so that required gradient dielectric constant is achieved; and lightweight of the antenna is achieved when the electrical property of the antenna is met.

A level sensing device with a high frequency radar system is provided. The radar system includes a radar high frequency module, a carrier board and a controller. The radar high frequency module is mounted on the carrier board using surface mount techniques. The controller includes a processor and the radar high frequency module has a plurality of components including one or more microwave integrated circuits, a radiating patch antenna, and coupling means for channeling a radiated signal from the patch antenna out of the module. The components are encapsulated to form the module and the coupling means includes a dielectric rod.

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.

This invention relates to radiofrequency (rf) cavities and couplers that comprise metallic or dielectric rods to provide specified concentration of field patterns for the operating modes in the interaction region, for applications in particle accelerators, pulsed rf power sources, amplifiers, mode converters and power couplers.

A clamping assembly for use in conjunction with high voltage solid state devices. The clamping assembly includes a clamp frame having upper and lower clamping plates substantially composed of aluminum and joined together by four dielectric rods composed of glass laminate material. The clamping assembly further includes a compression assembly mounted in the upper clamping plate and including several spring washers disposed in a recess defined by the upper clamping plate. The position of a compression cap attached to the upper clamping plate by eight cap screws can by adjusted by way of the cap screws so as to compress, or deflect, the spring washers. The spring washers in turn exert a compressive force that is a function of the spring constant k of the spring washers as well as of the distance over which the spring washers are compressed by the compression cap. The compressive force thus generated is transmitted to a pivot ball seated in a recess collectively defined by the spring washers. A force distribution member defines a socket in which the pivot ball is partially received and transmits the compressive force to a stack which is disposed between the upper and lower clamping plates and includes semiconductor devices and heat sinks. The socket in the force distribution member permits the force distribution member to rotate with respect to the pivot ball so that the compression surface of the force distribution member automatically moves to a position wherein the compression surface is in substantial contact with the upper surface of the stack, notwithstanding any horizontal misalignment of the stack. As a result of the substantial contact between the compression surface and the upper surface of the stack, the compressive force is distributed substantially uniformly across the upper surface of the stack.

The invention relates to a two-dimensional photonic crystal controllable ''AND/OR'' logic gate which comprises four input waveguides and an output waveguide, wherein one input waveguide is used for inputting a control signal; one input waveguide is an idle waveguide; and the other two input waveguides are signal input waveguides. The logic gate is distributed in a mirror symmetry way with a network center axial line of a linear defect waveguide; the symmetrical center position of the intersection of every two input waveguides of the logic gate is provided with a nonlinear dielectric rods as a coupling modulating zone for modulating signal power leading to the next stage of output waveguide; and a nonlinear dielectric rod is arranged on the output waveguide of the logic gate away from the third dielectric rod of the coupling modulating zone. The controllable AND/OR logic gate can be used for logic control of an optical signal by using an all-optical signal, and has the characteristics of small volume, simple structure and high response speed. In addition, all-optical modules of different functions can be manufactured on the same chip so as to be suitable for large-scale optoelectronic integration.

An object of the present invention is to provide an improved and simplified filter assembly. The object is achieved by a dielectric rod (120, 610, 620) for a filter chassis (110). The dielectric rod (120, 610, 620) extends between a first end (121) and a second end (122). The dielectric rod (120, 610, 620) comprises a conductive element (150) placed at the first (end 121). The conductive element (150) is adapted to be in conductive contact with a first contact means (141) of the filter chassis (110). The dielectric rod further comprises a second fastening element (160) placed at the second end (122). The second fastening element (160) is adapted to be attached and detached to a first fastening element (131) comprised in the filter chassis (110), such that the dielectric rod (120, 610, 620) is replaceable in the filter chassis (110).

A device and method is disclosed for manufacturing optical fiber preforms utilizing microwave plasma assisted chemical vapor deposition. Precursor gas is introduced to the face of a vertically mounted dielectric rod, and a plasma is struck by means of simultaneous excitation of an E01 type wave and an H type wave with rotating linear polarization. The silica rod is positioned so that its face is at the bottom of the tube. Precursor gas is delivered from a position below the face of the silica rod, and microwave energy, which travels through the rod to the rod face, is delivered from a source positioned above the rod. With this configuration, a uniformly dense plasma localized on the face of the rod can simultaneously deposit both a pure or doped core and a doped cladding. It is also useful for creating waveguides, preform cores for use as substrates in creating optical fiber preforms, capillaries and ceramic rods.

Described and shown is a dielectric antenna (1) having a dielectric feeding section (2), a first transition section (3) comprising a dielectric rod, a dielectric emitting section (5) and, a further, second transition section (4) forming a dielectric horn, wherein the feeding section (2) can be struck with electromagnetic radiation (6), electromagnetic radiation (6) can be guided with the first transition section (3) and the second transition section (4) and the electromagnetic radiation can be emitted from the emitting section (5) as airborne waves.

The object of the present invention is to provide a dielectric antenna, which is adaptable as low-loss as possible to different mounting situations, which additionally is as low-reflection as possible and, at the same time is highly bundling.

The object of the above-mentioned dielectric antenna is met in that the emitting section (5) is designed as dielectric tube connecting to the second transition section (4).

The invention discloses a dual-frequency antenna feeding system. The feed system includes a dual-frequency combiner and a dual-frequency feed; the dual-frequency combiner includes a common waveguide, a balanced orthogonal mode coupler, and a high-frequency band input circular waveguide; the common waveguide is a circular waveguide adapted to the low-frequency band , one end of which is connected to the high-frequency input circular waveguide through a conical transition waveguide; the balanced orthogonal mode coupler is used to divide the low-frequency signals in the horizontal and vertical polarization directions into two equal paths, and pass through the common waveguide on the side wall The four orthogonal ports facing each other are respectively fed into the common waveguide; the dual-frequency feed includes a corrugated horn; an insulating dielectric rod with both ends in the shape of a cone is arranged in the cavity of the common waveguide, and one end is inserted with an interference fit. The high-frequency band enters the circular waveguide, and the other end extends outward along the axis of the corrugated horn to the outside of the horn mouth. The invention also discloses a dual-frequency antenna. The invention can make the E frequency band share the antenna with the common low frequency band, increase the communication capacity and reduce the system cost.

The invention discloses a plasma resonance microstructure fiber sensor which comprises a light source, two ordinary single mode fibers, a microstructure fiber and a photoelectric detector, wherein, the light source, the first ordinary single mode fiber, the microstructure fiber, the second ordinary single mode fiber and the photoelectric detector are connected sequentially; the microstructure fiber is formed by photonic crystal fiber taper which has paralleled hexagon cross section and two-dimensional periodic structure; a metal membrane and a protein polymer membrane are coated on the surface of the tapered section from inside to outside sequentially; and the periodic structure consists of a background medium and dielectric rods which are distributed and arranged in the background medium periodically. As the usage of a microstructure fiber cladding light guiding mechanism, the fiber sensor can not only educe a guided mode without peeling cladding, but also realize high coupling efficiency of optical power of incident wave entering surface plasma resonance wave without a buffer layer. The invention has the advantages of simple process, compact structure, high measuring accuracy, strong anti-interference ability, being capable of being operated in harsh environment, and the like.

The invention relates to an ultra-wide-band dielectric-loaded four-ridge horn feed source. The feed source is a dielectric-loaded wide-band dual-polarized circular-opening four-ridge horn, with a working frequency band of 0.6-4GHz, and applied to a radio telescope ultra-wide-band receiver system. The feed source consists of a four-ridge horn, a four-ridge circular waveguide, ridge film sheets, a dielectric rod, a metal outer edge, a first coaxial probe, a second coaxial probe and a dielectric ring. By adding the ridge film sheets to the circular waveguide, the working bandwidth of the four-ridge circular waveguide is far higher than that of the circular waveguide; then the four-ridge waveguide is made into the four-ridge horn so as to realize the ultra-wide-band and dual-polarized functions and the like; by loading the dielectric rod, the high-frequency gain can be lowered, and by loading the metal outer edge, the low-frequency gain can be improved, so that gain consistency in the working frequency band can be realized; by loading the dielectric ring and changing the cross section of the ridges, the equalization radiation property of a directional diagram can be adjusted; the feed source directional diagram is relatively high in equalization; and an actually measured result is basically identical to a simulation result, so that radio astro observation requirement can be satisfied.

The invention provides a dielectric-filled circular waveguide circularly polarized antenna, and includes a waveguide cavity (1) with a circular truncated cone and a dielectric rod (2) filled in the waveguide cavity. The waveguide cavity is formed by connecting a dielectric circular waveguide and a conical horn, a circular truncated cone and a rectangular end face tapered gradation waveguide (11) at the center of the circular truncated cone are manufactured on a rear end of the waveguide cavity, after transition to a circular waveguide (12) extending section, the rectangular end face taper gradation waveguide is connected with the conical horn (13) to form an antenna feed section which is filled in a feed end of a rear section of the tail of the dielectric rod in the waveguide cavity, a conical gradation feed matching section (21) and a front part front section radiation end are manufactured, a radiation matching section (23) formed by a circular truncated cone gradation transition section is manufactured, and a pair of radially symmetric air grooves (24) are manufactured on a cylinder of a circular polarizer (22) located in the middle of the dielectric rod (2), so as to realize a linear polarization-to-circular polarization function. The dielectric-filled circular waveguide circularly polarized antenna provided by the invention is particularly suitable for serving as an aperture-downsized circularly polarized waveguide antenna.

The invention provides a transmit-receive dual-polarized and dual-band feed source for a parabolic antenna system, a luneberg lens antenna system and the like in satellite communication. The feed source works at Ku band, has a rotational symmetric directional diagram with adjustable lobe width, a cross polarization level which is less than -35dB, high radiation performance such as return loss and transmit-receive isolation, has a simple, small and exquisite structure and high practicality, and can flexibly meet different requirements of different antenna systems.

A discharge lamp (20) for providing visible and/or infrared radiation comprising a stationary light transmitting bulb (21) filled with a composition that emits light when in plasma state, a radiofrequency source (41) having an output terminal (44) radiating a radiofrequency field for ionizing and heating the composition in the bulb to bring it in a plasma state (35), and a dielectric rod (22) aligned with the output terminal and positioned between the output terminal (44) and the bulb (21) acting as dielectric waveguide for the radiofrequency field.

The invention discloses a curved-surface feed source transmitting and receiving integrated double ellipsoid lens antenna. The antenna includes a double ellipsoid lens antenna, a lens extension layer, a lens support, a pedestal, receiving feed source antenna arrays and transmitting feed source antenna arrays. The double ellipsoid lens antenna, the lens extension layer and the lens support are all made of medium. The upper surface of the lens extension layer coincides with the lower surface of the lens. The lens support is a hollow cylindroid and the pedestal is a cylindroid. An arc-shaped concave face of the upper surface of the pedestal is provided with the receiving feed source antenna arrays and the transmitting feed source antenna arrays. A one-dimensional scanning or a two-dimensional scanning array is formed according to the distribution way of the receiving feed source antenna arrays and the transmitting feed source antenna arrays. Each of the receiving feed source antenna arrays and the transmitting feed source antenna arrays includes a plurality of waveguide dielectric rod antennas. According to the invention, integration of a transmitting antenna and a receiving antenna is achieved; the design freedom is high; the wave beam consistence is good; the aperture efficiency is high; the side beam is comparatively low; the directionality is good; and the weight is low.

The invention discloses a photonic crystal fiber polarization beam splitter provided with a two-dimensional periodical structure of photonic crystal fiber. The periodical structure is constituted by a background medium and periodically distributed dielectric rods arranged in the medium; the cross section is a parallelepiped; a periodically arranged defect area without single dielectric rod in the background medium is a waveguide core. The advantages of the photonic crystal fiber polarization beam splitter are: easy to achieve stable isophotal power or a certain percentage of splitting ratio, small structural size, not vulnerable to the impact of environmental conditions, small light loss, good polarization of polarized coupling and easy to design. The invention can select different coupling length through structural adjustment to achieve splitting ratio regulation and splitting function.