121 results about "Square waveguide" patented technology

The invention belongs to the field of design and manufacturing of millimeter wave antennas and provides a broadband dual circularly polarized planar waveguide array antenna. The antenna comprises a radiation aperture, a resonant cavity, a feed square waveguide, a circular polarizer, a dual polarization feed network and a standard waveguide interface which are sequentially stacked from top to bottom, wherein the radiation aperture consists of multiple 2*2 atomic arrays arranged in an array; the resonant cavity consists of a square ridge waveguide resonant cavity, a first square waveguide resonant cavity and a second square waveguide resonant cavity which are sequentially stacked from top to bottom; the circular polarizer is formed by inserting a stepped metal membrane into the square waveguide in a center loading manner; the dual polarization feed network consists of a left-hand circular polarization feed network and a right-hand circular polarization feed network; the standard waveguide interface comprises two output ports, namely, a left-hand circular polarization interface and a right-hand circular polarization interface. The broadband dual circularly polarized planar waveguide array antenna with high gain and efficiency is realized.

The invention discloses a high-power low-PIM (passive intermodulation) broadband polarized frequency duplexing feed assembly in a Ku frequency band, comprising a symmetrical two-arm orthogonal modal coupler and two frequency duplexers, wherein the symmetrical two-arm orthogonal modal coupler comprises an inner structure and a shell; the inner structure comprises a public square waveguide, a symmetrical two-arm coupling access and a longitudinal straight access, thus forming a public port, a symmetrical two-arm synthetic port and a longitudinal straight port; two side faces of the public square waveguide are provided with two rectangle coupling windows with the same size symmetrically; an inductive column which is parallel to and has the same length with a long edge of the rectangle coupling window is inserted into the middle point of a short edge of each rectangle coupling window; and a shaping diaphragm which is vertically connected with the rectangle coupling windows at two sides is inserted into the center in the public square waveguide. According to the assembly, the symmetrical two-arm orthogonal modal coupler is connected to the two frequency duplexers to finish the polar duplex and the frequency duplex of signals, thus solving the two traditional technical problems of the polar duplex and the frequency duplex of an antenna system at the Ku frequency band. The special shaping curve diaphragms and the inductive columns are utilized in the symmetrical two-arm orthogonal modal coupler, thus realizing the broadband matching and avoiding the asymmetrical higher order modes. The assembly has the advantage of compact structure.

The invention relates to the technical field of communication and in particular discloses a compact type ultra wide band polarizer. The compact type ultra wide band polarizer comprises a circular waveguide port, a transition chamfer square waveguide and an ultra wide band phase shifter, wherein the circular waveguide port is connected with the ultra wide band phase shifter by virtue of the transition chamfer square waveguide, the circular waveguide port is arranged at the two ends, one end is an input circular waveguide port, and the other end is an output circular waveguide port; the transition chamfer square waveguide is a square waveguide with four ridges chamfers; and the ultra wide band phase shifter is a square waveguide the side wall of which is provided with a horizontal ridge and a vertical ridge, and the horizontal ridge is symmetrically distributed on the two opposite side walls of the square waveguide along the axial direction of the square waveguide. In the invention, a simple and compact structure is adopted, linear circular polarization on two direction field vectors are smartly realized, technical indexes of amplitude and phase for a circular polarizer to be orthogonal with two field components are met, and the compact type ultra wide band polarizer disclosed by the invention has the advantages of compact structure, small volume, light weight, low cost, easiness in processing, easiness in tuning, high efficiency, high power capacity and the like.

An advanced reverse orthomode junction feed assembly with associated filters for use in an antenna feed system for transmitting a first low frequency (LF) electromagnetic signal and receiving a second high frequency (HF) electromagnetic signal. The assembly includes, in a preferred square waveguide topology, an orthomode junction with an antenna port for connecting to a choking iris matching section and an antenna feed, an opposed generally coaxial first signal port to transmit the LF signal, and a generally perpendicular second signal port, located there between, to receive the HF signal. A first signal channel having fully asymmetric on-axis second signal reject filters connects to the first port; and a second signal channel having cross-axis first signal reject filters with multi-cavity HF path matching assembly connects to the second port. The use of a magic-tee as a combiner for the receive signal provides tracking capability to the antenna feed system.

The invention relates to a satellite-borne K-band phased array antenna circularly-polarized waveguide radiation array, which can radiate microwave signals to the space, and can receive microwave signals from the space. The satellite-borne K-band phased array antenna circularly-polarized waveguide radiation array is composed of a plurality of antenna units, wherein each antenna unit comprises a matching diaphragm, an SMP coaxial feed socket, a square waveguide radiator, a waveguide-to-coaxial adapter, an SMP feed socket feed end, an impedance matching device and a circular polarizer, and adopts an integral design; and the matching diaphragms are adopted among the antenna units for deploying coupling characteristics among radiating units, so as to achieve more ideal standing wave performance and radiation characteristics. The satellite-borne K-band phased array antenna circularly-polarized waveguide radiation array is simple and reliable in structure, has the advantages of two-directional plus/minus 40-degree wide angle scanning, low sweep gain drop and excellent circular polarization characteristics, and satisfies the requirements for an phased-array antenna of satellite-borne intersatellite and satellite-to-ground communication. The antenna adopts an aluminum structure, and performances of the antenna are not affected by factors such as elemental oxygen corrosion and ultraviolet radiation of the on-orbit space environment.

A method for detecting an anomaly in a composite material comprising directing two transmitted electromagnetic wave signals orthogonally polarized with respect to each other from a probe to the composite material, wherein the probe and composite material are positioned for near-field evaluation of the probe. A related apparatus comprising an open-ended square waveguide probe.

The invention relates to an orthogonal-mode coupler, and belongs to the technical field of couplers. The orthogonal-mode coupler comprises a square waveguide, a side arm waveguide, an impedance adjusting block and a straight arm waveguide, wherein the side arm waveguide and the square waveguide perform electromagnetic coupling through a side arm coupling slit, and the straight arm waveguide and the square waveguide perform electromagnetic coupling through a straight arm coupling slit. According to the invention, a wide-seam structure is adopted to realize impedance matching, complex structures such as an inductance rod, a diaphragm, a gradient impedance transformation segment, which are used for matching, in a traditional orthogonal-mode coupler are omitted, so that the structure of the orthogonal-mode coupler provided by the invention is more compact.

The invention discloses a directional coupler used for measuring microwave power of a gyrotron traveling wave tube. The directional coupler is a three-port device, which comprises a primary waveguide, a secondary waveguide which is correspondingly arranged on the side wall of the primary waveguide in a matched manner, wherein the primary waveguide is a circular waveguide comprising an input port Pin and an output port P1out; the secondary waveguide comprises a square waveguide, a transition waveguide and a rectangular waveguide which are sequentially connected, and the rectangular waveguide comprises an output port P2out; and a plurality of coupling holes, which realize power distribution between the primary waveguide and the secondary waveguide by utilizing a hole coupling method, are formed between an inner cavity of the circular waveguide and an inner cavity of the square waveguide in a penetrated manner. The directional coupler provided by the invention can realize the effect of reflecting variation situations of the microwave power of an electric vacuum amplification device in the millimeter-wave band immediately and accurately, and since the directional coupler is the three-port device, the output port P2out of the rectangular waveguide achieves the coupling from a circular waveguide TE01 Mode to a rectangular waveguide TE10 Mode.

The invention discloses an 18-40GHz low sidelobe dual-polarized horn antenna. A diagonal horn shell, a four-ridge waveguide section and an end cover are connected in sequence; the four-ridge waveguidesection comprises a square waveguide, four ridge sheets are fastened at four corners in the square waveguide through screws, and the four ridge sheets are in a cross shape; a feed probe of a radio frequency connector is inserted into the ridge sheets from the outer side of the square waveguide. An end cover is provided with a boss, the boss is provided with a reflection cavity, and the square waveguide is sleeved on the boss. The antenna also comprises an adjusting screw, and the adjusting screw extends into the reflection cavity from the bottom of the end cover. According to the invention, the antenna has a good application prospect in the field of electronic measurement, adopts a dual-port structure, can transmit or receive two orthogonal polarization waves, has a working bandwidth of more than 9: 1 octave and a sidelobe level of-25dB, and can be applied to detection systems such as high-resolution radars and the like.

The invention relates to a horn radiator for a Ka-band plate array antenna. The horn radiator for the Ka-band plate array antenna comprises a horn radiator port, a horn radiator side wall, a horn radiator feed port, a waveguide orthogonal mode coupler, a first tuning block, a square waveguide side wall feed port, a side wall waveguide, a second tuning block, a square waveguide bottom surface feed port, a bent waveguide and a bent waveguide tuning block. According to the horn radiator for the Ka-band plate array antenna, the distribution of coupled electromagnetic fields can be uniform through a horn radiator structure formed by the horn radiator port and the horn radiator side wall, so that a horn radiator of high aperture efficiency is obtained.

The invention discloses a broadband quadruple-ridged waveguide circular polarizer and belongs to the technical field of satellite communication. The broadband quadruple-ridged waveguide circular polarizer comprises a square waveguide cavity, two vertical ridges and two horizontal ridges, wherein the two vertical ridges are respectively arranged the opposite waveguide walls, and the two horizontalridges are respectively arranged on the other two waveguide walls. The broadband quadruple-ridged waveguide circular polarizer disclosed by the invention utilizes the quadruple-ridged waveguide broadband characteristic, so that the heights and the widths of two pairs of orthogonal ridges are different, and propagation constants of two orthogonal polarization waves can be changed; according to theprinciple of the circular polarizer, when two polarization waves with the same amplitude and the same phase pass through the circular polarizer, the amplitudes of the two polarization waves are equal,phase difference is 90 degrees, and circular polarization is formed; meanwhile, no loading and phase shifting unit and no toothed groove structure are arranged on the ridges, so that the defect thatan existing circular polarizer cannot be applied to 1mm waveband is overcome; the broadband quadruple-ridged waveguide circular polarizer has the characteristics of application to L waveband to W waveband, wide work frequency band, excellent electric performance, simple structure, no debugging, high reliability and suitability for volume production.

The invention provides an integrated device for seamed butt joint of an AWG (arrayed waveguide grating) output waveguide and a waveguide photodetector and a preparation method of the integrated device. The integrated device comprises a substrate, the AWG output waveguide and the waveguide photodetector, wherein the left area and the right area of the substrate are taken as an AWG area and a PD (photodetector) area respectively; the AWG output waveguide is located on the AWG area on the substrate, and an AWG lower coating layer and an AWG core layer extend to the PD area; the waveguide photodetector is formed above the AWG core layer in the PD area on the substrate, and a PD lower contact layer of the waveguide photodetector extends into an AWG upper coating layer of the AWG output waveguide and is located above the AWG core layer; a PD absorbing layer and a PD upper contact layer of the waveguide photodetector are spaced with the AWG upper coating layer of the AWG output waveguide by a narrow seam. According to the integrated device and the preparation method, excessive coupling loss generated during interconnection of discrete devices is avoided, and the energy efficiency of an optical link is improved through evanescent field coupling; meanwhile, by means of the seam between the AWG output waveguide and the waveguide photodetector, the capacitance of PD devices is reduced, and the device bandwidth is increased.

A plasma processing apparatus includes a stage, processing vessel, and microwave supply device. A target object is placed on the stage. The processing vessel accommodates the stage. The microwave supply device supplies microwaves into the processing vessel, and includes a parallel-plate waveguide, a plurality of slots, a square waveguide array, and a distributor. The parallel-plate waveguide includes a first conductive plate which is rectangular when seen from the top and arranged to oppose the stage, and a second conductive plate which is arranged substantially parallel to the first conductive plate and has the same shape as that of the first conductive plate when seen from the top. The plurality of slots are formed in the first conductive plate. The square waveguide array includes a plurality of square waveguides aligned in their widthwise directions (X) perpendicular to there axial directions (Y). One end of each of the square waveguides is connected to the parallel-plate waveguide. The distributor is connected to the other end of each of the square waveguides and distributes and supplies the microwaves to the square waveguides with the same phase. A plasma processing method and a flat panel display manufacturing method are also disclosed.

The module comprises an input/output access point 10 at a first end of a waveguide with a square cross section, called a square waveguide, two access points 11A, 11B made of waveguides with a rectangular cross section, called rectangular waveguides, placed side by side at a second end of the square waveguide and a septum 9 positioned in the square waveguide at the end of a separation region 12 common to the two rectangular waveguides in order to allow the production of two circular polarizations of opposite handedness each associated with a rectangular waveguide.The module is arranged so as to form a diplexer in which the septum is included and where the access points by rectangular waveguide 11A, 11B are extended by filters 13A, 14B, each access point being endowed with a filter provided in order to transmit a frequency band which is different. The steps of the septum are dimensioned so as to compensate for the reflections.

The invention relates to a cross-shaped slot antenna, and belongs to the technical field of antennas. The antenna is composed of a dielectric radome, a radiating square cavity, cross-shaped slots, a multi-mode waveguide square cavity and a feed square waveguide. All the parts are arranged from top to bottom in sequence in a laminating mode. The topmost layer is a first layer which is a medium flat plate, namely, the medium dielectric radome; the second layer is formed by four metal square frames, namely, the radiating square cavity; the third layer is formed by four cross-shaped slot bodies, namely, the cross-shaped slots; the fourth layer is a metal square cavity, namely, the multi-mode waveguide square cavity; the fifth layer is a waveguide with the square cross section, namely, the feed square waveguide. The cross-shaped slot antenna is of a layered structure and can be machined in a layered mode, screws are used for connecting all the layers, and the welding technology of a traditional antenna is eliminated. The cross-shaped slot antenna is simple in structure and easier to machine.

A dual polarized reflector antenna assembly, provided with a reflector dish coupled to a feed hub with a feed port there through; a transceiver support bracket coupled to a backside of the feed hub; a circular to square waveguide transition coupled to the feed port; a square waveguide coupled to the circular to square waveguide transition; an OMT coupled to the square waveguide; the OMT provided with an OMT intersection between a square waveguide and a pair of rectangular waveguides oriented at ninety degrees to one another, an output port of each rectangular waveguide arranged normal to a longitudinal axis of the dual polarized reflector antenna assembly. Alternatively, a circular waveguide may be applied between the feed port and the circular to square waveguide transition, eliminating the square waveguide, or the rectangular waveguides may be extended longitudinally, also eliminating the square waveguide.

The invention relates to an X-band low-grating-lobe circularly polarized antenna, which is composed of a long horn antenna and a separator plate polarizer. The long horn antenna adopts a multi-inner-cavity design of metal separator plates. The aperture field distribution is improved by filling a radiation aperture surface with a dielectric material, so that the antenna gain and aperture efficiencyare improved, narrower directional diagram zero-point width is ensured, and grating lobe suppression capability is improved. The long horn antenna is connected with the separator plate polarizer through a flange in a waveguide cascade mode. The separator plate polarizer is a square waveguide with a metal separator plate in the middle, and the square waveguide is divided into two rectangular waveguides through the metal separator plate, so that a transmitting channel and a receiving channel are formed; and coaxial waveguide conversion of guide openings of the two rectangular waveguides is achieved through a stepped impedance converter. The X-band low-grating-lobe circularly polarized antenna adopts the waveguide as a main body structure, so that the complexity of structural design is simplified, the link loss is reduced, the utilization efficiency of the aperture of an array surface is improved, and the later-period assembly production and equipment debugging efficiency is improved.

The invention provides a dual-frequency dual-circular polarization navigation measurement and control antenna feed, which comprises a coaxial multi-ring waveguide horn antenna, a diaphragm-type circular polarizer and a coaxial waveguide converter, wherein the coaxial multi-ring waveguide horn antenna comprises a circular waveguide and a coaxial multi-ring outer wall; the diaphragm-type circular polarizer comprises a square waveguide and a stepped diaphragm in sequence along an axial direction, the square waveguide is connected with the circular waveguide, and the stepped diaphragm is located on the central axis of the square waveguide; and the coaxial waveguide converter is connected with the diaphragm-type circular polarizer and comprises a rectangular waveguide and a coaxial probe, and the coaxial probe is used for converting electromagnetic waves in the rectangular waveguide to coaxial signals.

The invention belongs to the technical field of antenna feed sources in a satellite communication device, and particularly relates to a Ku-waveband wideband OMT. The OMT comprises a square waveguide, a branch waveguide and a square matrix transformation section; a head end surface of the square waveguide is provided with a common port; a waveguide step is arranged at one side of the square waveguide, and the branch waveguide is transduced at step surface places of the waveguide step; an output port of the branch waveguide is formed into a horizontal polarization port; a tail end surface of the square waveguide is provided with the square matrix transformation section; an output port at a tail end place of the square matrix transformation section is formed into a vertical polarization port; at the side where the waveguide step of the square waveguide is located, gradual changing values for heights of continuous step surfaces formed by the waveguide step and the square matrix transformation section fit for a chebyshev function; and gradual changing values for heights of step surfaces formed at the square matrix transformation section of the square waveguide also fit for the chebyshev function. The Ku-waveband wideband OMT has the advantages of compact structure, high bandwidth and small size, and can meet the use requirement of a satellite array antenna.

The optical interconnection coupled structure based on soft photoetch includes two reflecting surfaces and two intermediate coupled matching sections, they are successively connected on two sides of square waveguide tube, and formed into a symmetrically-connected connection body and mounted on the printed circuit board, on the printed circuit board the through holes are opened, its light source and light receiver are placed on another side of printed circuit board, the light source is aligned with one reflecting surface by means of first through hole, and the light receiver is aligned with another reflecting surface by means of second through hole. The square waveguide tube can be one-step formed by utilizing soft photoetching process. Said structure is applicable to internal short-distance high-speed data transmission in the computer.

The invention discloses a high-power truncated microwave output window. The high-power truncated microwave output window comprises an input square waveguide, an input matching transition waveguide, an H-shaped dielectric window slice, an output matching transition waveguide and an output circular waveguide, which are sequentially connected, wherein the longitudinal section of the H-shaped dielectric window slice is H-shaped; one H-shaped side is connected with the input matching transition waveguide and the other side is connected with the output matching transition waveguide; and a field suppression ring is arranged on the inner wall, close to the H-shaped dielectric window slice, of the input matching transition waveguide. The field suppression ring structure is adopted by the input surface of the H-shaped dielectric window slice, so that the power capacity can be effectively improved. High-efficiency microwave transmission from the input square waveguide to the output circular waveguide can be achieved by adjusting the dimension parameters of the input matching transition waveguide, the field suppression ring, the H-shaped dielectric window slice and the output matching transition waveguide; and the high-power truncated microwave output window has the characteristics of compactness and high peak power capacity, and is suitable for partitioning and sealing in a microwave feeder system under a high-power condition.

The invention discloses a dual-band high-isolation orthogonal mode coupler. A vertical polarization transmitting channel is vertically connected with a horizontal polarization receiving channel. The vertical polarization transmitting channel comprises a common circular waveguide port, a circular-rectangular transition matching network, a square waveguide, a second-order stepped impedance matchingnetwork and a vertical polarization port which are connected successively. Three metal cylinders are arranged in the square waveguide. The horizontal polarization receiving channel comprises an open coupling window and a horizontal polarization port which are connected successively. The open coupling window is connected with the square waveguide and located in front of the metal cylinders. In theinvention, a transmitting frequency band ranges from 13.75 GHz to 14.5 GHz, and a receiving frequency band ranges from 10.7 GHz to 12.75 GHz. A polarization isolation degree in a working frequency band is superior to 55dB, a return loss of each port is less than -20dB, and a passband insertion loss is less than 0.5 dB. The structure is simple, compact and stable and processing is convenient, and the coupler can be widely applied to a radar system of a corresponding frequency band.

The invention discloses a K and Ka dual-band orthogonal mode coupler, which is applied to the technical field of communication and aims to solve the problem of frequency reuse in a communication system and increase the number of communication channels and the system capacity. Through vertical connection of the vertical polarization channel and the horizontal polarization channel, vertical polarization waves are used for transmitting transmitted signals, horizontal polarization waves are used for transmitting received signals, and orthogonal decoupling of the two polarization waves is used forachieving isolation between the signals. The vertical polarization channel comprises a common circular waveguide port, a rectangular circular step transition, a square waveguide, a step impedance matching section and a transmitting port which are communicated in sequence, and the horizontal polarization channel comprises a receiving port and a coupling resonance window which are communicated in sequence. The invention has the advantages of simple structure, small volume, convenience in processing, high polarization isolation, small standing wave and insertion loss and other excellent electrical properties.