71 results about "Slotted waveguide" patented technology

A slotted waveguide antenna stiffened structure for an aircraft having an aircraft skin. The slotted waveguide antenna stiffening structure including a structural stiffening element reinforcing the aircraft skin; the structural element connected to a radio frequency feed source, the source providing energy with electromagnetic bandwidth to a slotted waveguide antenna having a plurality of slots. The antenna conformal to the aircraft skin and the structural stiffening element, the structural stiffening elements functioning as waveguides for the electromagnetic bandwidth. The slots may include a slot sealant enclosing the plurality of slots.

A radial slot antenna (1; 60) comprising a radial waveguide, which includes an upper plate (5), having a centroid (O) and an edge region (14) and provided with a plurality of radiating apertures (4), formed as slots in the upper plate (5), which develop according to an ideal annular pattern (16) around the centroid (O). The radiating apertures (4) are arranged in such a way as to form at least one first radiating region (31a) and one second radiating region (31b), which are distinct and radially separated by a dwell region (33a) without radiating apertures and wherein, in the first and second radiating regions (31a, 31b), radially adjacent radiating apertures (4) are separated from one another by a respective mutual radial distance, the dwell region (33a) having a radial width (δ) greater than the mutual radial distances of the radiating apertures (4) in the first and second radiating regions (31a, 31b). The slot antenna further comprises a signal feeder (10) operable for supplying am electromagnetic field (Ψ₀, Ψ₁) so as to assume, in the first and second radiating regions, opposite phases, in such a way that the electromagnetic field emitted by the slot antenna can be expressed via Bessel functions.

A low-loss, low-profile dual-polarization slotted waveguide antenna includes one or more waveguides having a characteristic wavelength. Radiation apertures comprised of a waveguide slot pairs are formed in each or the waveguides of the antenna. Each waveguide slot pair includes a first waveguide slot and a second waveguide slot which are configured for inducing a circularly polarized (CP) radiated field in the waveguide. The waveguide slots of each waveguide slot pair may be generally crescent-shaped and spaced a distance of at least approximately one-fourth of the characteristic wavelength from each other. The waveguide slots may further be positioned for allowing the antenna to receive and/or radiate both left-hand and right-hand circularly polarized fields (LHCP and RHCP) and for providing control of the sense of a circularly polarized (CP) field radiated by the antenna by changing the direction of incidence of an electromagnetic source wave propagated in the waveguide.

A flat scanning antenna comprises at least one slotted waveguide array comprising two dielectric substrates, one superposed above the other. The two substrates comprise the same number of waveguides, which are in mutual correspondence and communicate between them, pairwise, via corresponding coupling slots. Each waveguide of the upper substrate further includes a plurality of radiating slots, all the radiating slots being mutually parallel and oriented in the same direction and each waveguide of the lower substrate includes an individual internal supply circuit comprising an individual phase-shift/amplification electronic circuit.

A slotted waveguide antenna for receiving circularly polarized waves capable of improving impedance matching, an axial ratio and an axial ratio bandwidth by additionally forming a dielectric plate between a conductive plate having waveguides and a polarizer of an uppermost layer is disclosed. The slotted waveguide antenna for reception of circularly polarized waves, which includes a lower conductive plate and an intermediate conductive plate which are coupled to each other to have a feeding line and a waveguide to which satellite frequency signals are transmitted and an upper conductive plate which is coupled to an upper portion of the intermediate conductive plate and has a plurality of cavities and slots to communicate with the waveguide so as to transmit and receive satellite frequency signals, includes a polarizer with strip conductors for converting linearly polarized waves into circularly polarized waves and matching stubs which are formed at an upper portion of the upper conductive plate, and a dielectric plate which is disposed between the upper conductive plate and the polarizer (100) to perform impedance matching with space impedance.

The invention discloses a slotted branch type terahertz wave polarization beam splitter. The beam splitter comprises a signal input end, a first signal output end, a second signal output end, a substrate, an inverse z-shaped slotted silicon waveguide and a z-shaped branch silicon waveguide, wherein the inverse z-shaped slotted silicon waveguide and the z-shaped branch silicon waveguide, which are not adjacent to each other, are arranged on the substrate; the inverse z-shaped slotted silicon waveguide is formed by connecting a rectangular slotted silicon waveguide, a first straight corner connecting silicon waveguide and a first output silicon waveguide in order; a first rectangular coupling slot is arranged on the rectangular slotted silicon waveguide; the z-shaped branch silicon waveguide is formed by connecting an octangular slotted waveguide, a rectangular waveguide, a second straight corner connecting silicon waveguide and a second output silicon waveguide in order; a second rectangular coupling slot is arranged on the octangular slotted waveguide; and signals are subjected to vertical incidence from the signal input end, pass through the inverse z-shaped slotted silicon waveguide and the z-shaped branch silicon waveguide and are output from the signal output ends. The beam splitter has the advantages of simple structure, high beam splitting rate, small dimension, low cost, convenience in preparation and the like.

The mode transforming structure includes a first waveguide structure. A slot waveguide region is coupled to the first waveguide structure. The slot waveguide region includes one or more complementary tapered pairs so near lossless transforming between the first waveguide structure and the slot waveguide region occurs so as to allow optical modes to be transferred between the first waveguide and the slot waveguide region.

The invention discloses a dual-frequency common-caliber waveguide slot waveguide antenna and a design method thereof, and an antenna array. The dual-frequency common-caliber waveguide slot waveguide antenna comprises a radiation port, a radiation sidewall, a first waveguide cavity, a second waveguide cavity, a Ku-band input port and a Ka-band input port; the radiation port, the radiation sidewall,the first waveguide cavity, the second waveguide cavity and the Ka-band input port are sequentially disposed from top to bottom, and the Ku-band input port is disposed on the first waveguide cavity.The dual-frequency common-caliber waveguide slot waveguide antenna and a design method thereof, and the antenna array are high in efficiency, high in gain, easy to process, dual-band and large in distance.

A slotted waveguide antenna element s provided, which includes at least one conductive surface provided with at least one annular slot, which defines at the central portion thereof a conductive zone and which electrically insulates the zone from the rest of the surface.

The invention provides a slotted waveguide antenna that can be laid in an existing space, effectively isolates signals which cannot reach isolation requirements and separately transmits the signals, and also provides a signal transmission device and a signal continuous transmission system that both comprise the slotted waveguide antenna. The slotted waveguide antenna is characterized by comprising at least one slotted waveguide tube for transmitting electromagnetic wave signals, wherein the slotted waveguide tube at least comprises a first pipeline and a second pipeline parallel to each other, the surface of each of the first pipeline and the second pipeline is equipped with multiple slots that enable the electromagnetic wave signals to be transmitted between the inside of each pipeline and the outside of each pipeline, and the first pipeline and the second pipeline are respectively used for transmitting two types of electromagnetic wave signals, wherein the frequency interval between the two types of electromagnetic wave signals cannot reach preset isolation requirements.

An electronically scanned antenna working in a wide frequency band comprises at least: one reflector panel comprising an array of phase-shifters cells; one slotted waveguide illuminating the reflector panel by a microwave having a variable frequency f. The deviation Δθ_f of the direction of the wave emitted by the slotted waveguide, as a function of the frequency variations, countering the variation Δθ_p of the aiming direction of the wave reflected by the reflector panel. The disclosed antenna can be used especially in applications requiring compact or low-cost antennas.

The invention relates to a large phased array radar antenna frame structure and a manufacturing method thereof. The large phased array radar antenna frame structure is formed by riveting a casting frame, multiple I-shaped aluminum beams, connecting angle members, a left longitudinal beam, a right longitudinal beam, an upper cross beam, a lower cross beam, four-corner joints, waveguide supporting strips, a skin, a supporting plate and the like. 128 slotted waveguides about 3 meters in length and other radar subsystems are mounted on a frame. By the frame, a bottleneck of difficulty in guaranteeing accuracy of a large phased array radar antenna is broken through, rigidity is improved by about 20-30% under the circumstance of same weight, the frame is low in cost and attractive in appearance, and environmental adaptability of the whole antenna is greatly improved after high-temperature pressure-sensitive adhesive tapes are pasted on the surfaces of the slotted waveguides. Designing and manufacturing technology of the large phased array radar antenna is already successfully applied in certain key military radar, is about to be applied in certain foreign-trade radar, is expected to bring about bigger economic benefit, military benefit and social benefit in the future and has wider application prospect.

The present disclosure relates to a slotted waveguide antenna system. The slotted waveguide antenna system includes a waveguide that includes a first surface and a plurality of slots defined in the first surface and a metamaterial structure positioned external to the waveguide. The metamaterial structure is configured to exhibit a negative effective permittivity and a negative effective permeability for an operating frequency range. The metamaterial structure includes a split ring resonator, a substrate and a wire structure. The wire structure includes a first portion, a second portion and a third portion, the second portion coupled between the first portion and the second portion, the first portion oriented parallel to the third portion, the second portion oriented perpendicular to the first portion and the third portion. A dimension of at least one of the first portion and the third portion is related to the operating frequency range.

A surface wave plasma generate device comprises a high-frequency power supply (1) connected in turn, an impedance adjusting unit (2), an energy transmission waveguide (3), a waveguide converter (4) and a cylindrical slotted waveguide (5), a dielectric tube (6) is nested on the outer wall of the cylindrical slotted waveguide (5), the cylindrical slotted waveguide (5) is provided with a plurality ofslots, the microwave forms a conductive current on the inner wall surface of the cylindrical slotted waveguide (5), which is cut off at the slit and passes through the slit in the form of a displacement current which radiates an electric field formed at the slit into the direction of the dielectric tube (6) to ionize the working gas near the dielectric tube and generate plasma around the outer wall of the dielectric tube (6). Compared with the prior art, the high-density plasma generated by the invention has the advantages of more homogeneity, stability, more activated groups and the like.

An asymmetric slotted waveguide and method for fabricating the same. The slotted waveguide is constructed in silicon-on-insulator using a Complementary metal-oxide-semiconductor (CMOS) process. One or more wafers can be coated with a photo resist material using a photolithographic process in order to thereby bake the wafers via a post apply bake (PAB) process. An anti-reflective coating (TARC) can be further applied on the wafers and the wafers can be exposed on a scanner for the illumination conditions. After a post exposure bake (PEB), the wafers can be developed in a developer using a puddle develop process. Finally, the printed wafers can be processed using a shrink process to reduce the critical dimension (CD) of the slot and thereby achieve an enhanced asymmetric slotted waveguide that is capable of guiding the optical radiation in a wide range of optical modulation applications using an electro-optic polymer cladding.

The invention discloses a triangular slotted waveguide array antenna, which is used in the fields such as radar communication, microwave communication, television broadcasting system communication and the like. The triangular slotted waveguide array antenna comprises a section of waveguide; the cross section of the waveguide is an isosceles right triangle; the wall surfaces of the sloping sides of the isosceles right triangle are provided with radiation slots; and feeder equipment is an N-type coaxial connector and positioned at one end of the waveguide. The triangular slotted waveguide array antenna has the characteristics of high gain, low side lobe, compact structure, easy control of aperture distribution and the like.

The invention discloses a passive inter-modulation test method based on near field coupling of a slot waveguide. The method realizes a near-field coupling PIM (Passive Inter-Modulation) test function by adding a slot waveguide structure in a test system on the basis of a conventional PIM test methods. The passive inter-modulation test method comprises the optimization method of a low-PIM slotted waveguide, a dielectric plate for regulating the coupling strength, and the slot size and distribution. The passive inter-modulation test method based on the near field coupling of the slot waveguide provided by the invention can be used for evaluating the size of nonlinearity and contact nonlinearity of microwave component materials, provide guidance for low PIM design and process control of the microwave component, provide a detection method for PIM sources in the production link, and improve the product yield.

The invention discloses a crossed-shaped slot crossed waveguide structure. The crossed-shaped slot crossed waveguide structure comprises an input/output area, a transition area and a crossing area; the input/output area is used for inputting and outputting signals and composed of common cross-shaped slot straight waveguides; the transition area is used for connecting the orthogonal straight waveguides and composed of cross-shaped slot bent waveguides, and perpendicular slots of the cross-shaped slot bent waveguides are filled with high refractive silica; the crossing area is used for achieving crossing of two cross-shaped slot crossed waveguide structures and composed of two parallel high refractive silica waveguides. According to the crossed waveguide structure, crossing consumption and crosstalk are low, the high refractive silica waveguide structures of which the width gradually changes are adopted, no resonant structure is related, large working bandwidth is needed, and the allowance of the preparation technology is high.

The invention relates to a dual-polarized slotted waveguide antenna array which comprises a horizontally-polarized slotted waveguide antenna array and a vertically-polarized slotted waveguide antenna array. The horizontally-polarized slotted waveguide antenna array comprises a horizontally-polarized radiation waveguide and a horizontally-polarized feed waveguide which are in up-down parallel connection through a common horizontally-polarized common wall. The vertically-polarized slotted waveguide antenna array comprises a vertically-polarized radiation waveguide and a vertically-polarized feed waveguide which are in up-down parallel connection through a common vertically-polarized common wall. The horizontally-polarized feed waveguide and the vertically-polarized radiation waveguide are connected through a common lateral wall, so that the horizontally-polarized slotted waveguide antenna array is horizontally parallelly connected with the vertically-polarized slotted waveguide antenna array. The horizontal plane waveguide walls of the horizontally-polarized slotted waveguide antenna array and the vertically-polarized slotted waveguide antenna array are parallel. The dual-polarized slotted waveguide antenna array has the advantages machining is facilitated due to the integral design of the dual-polarized slotted waveguide antenna array, antenna array mounting workload is reduced, and antenna array weight is reduced by 1/7-1/5 at the same time.