214 results about "Circular waveguide" patented technology

The invention aims at providing a microwave-spalling agent in-situ fracturing device and method for mining rock through drilling, and belongs to the technical field of drilling mining. A rectangular waveguide and a circular waveguide are matched with a coaxial inner core to achieve focused radiation, directional initial fractures are generated in a drilled hole according to a preset angle, and the directional initial fractures are fractured; and then a static spalling agent is injected into the initial fracture in a segmented and partial pressure mode, in-situ secondary fracturing is conducted on the basis of the microwave fracturing range by means of the fracture expansion effect brought by expansion pressure, and secondary expansion of the fracture is promoted. And by superposing the fracturing ranges of the microwaves and the spalling agent, a large-area communicated fracture network mainly comprising microwave directional fractures is formed. Finally, on the premise that the fracturing range and effect are guaranteed, the purposes of reducing mining drill holes, increasing the distance between the drill holes and improving the mining efficiency are achieved.

The present invention improves circumferential uniformity of plasma processing by minimizing circumferential variation of microwave electric field intensity in a wafer outer peripheral part. In a plasma processing device in which a TE11 mode microwave is introduced coaxially into a processing chamber via a circular waveguide, a 90° phase difference plate of a microwave is installed from above in the circular waveguide, and a 180° phase difference plate is installed below the 90° phase difference plate. The plasma processing device further has a rotation drive mechanism connected to the 180° phase difference plate. The plasma processing device further has a detector for detecting variations in the electric field intensity in the circumferential direction connected below the 180° phase difference plate, and has a control means for adjusting the rotation angle of the 180° phase difference plate so as to minimize the deterioration of the axial symmetry of the electric field intensity detected by the detector.

The invention discloses a metasurface-based rectangular-circular waveguide mode conversion device and a metasurface-based rectangular-circular waveguide mode conversion method, which are used for realizing TE10-TE20-TE01 metal waveguide mode conversion, and comprise a first section of waveguide, a second section of waveguide, a third section of waveguide, a fourth section of waveguide, a fifth section of waveguide, a first metasurface structure and a second metasurface structure, wherein the first, third and fifth sections of waveguides are respectively used for transmitting a rectangular waveguide TE10 mode, a rectangular waveguide TE20 mode and a circular waveguide TE01 mode, and the second and fourth sections of waveguides are used for generating multimode interference; the first metasurface structure is used for realizing conversion from a TE10 mode to a TE20 mode, and the second metasurface structure is used for realizing conversion from the TE20 mode to a TE01 mode; the second section of waveguide, the first metasurface structure and the third section of waveguide form a TE10-TE20 mode converter; and the fourth section of waveguide and the second metasurface structure form a TE20-TE01 mode converter. By utilizing the regulation and control capability of the metasurface on the electromagnetic field, the rectangular waveguide TE10 mode can be converted into the circular waveguide TE01 mode in a relatively small space.

The present application relates to a ring resonator comprising: a straight waveguide; and the runway type micro ring comprises an arc-shaped coupling section and a first straight arm connected with the arc-shaped coupling section, and the arc-shaped coupling section is coupled with the straight waveguide. Through the arrangement of the runway type micro-ring coupled with the straight waveguide, the perimeter of the annular waveguide can be increased while the communication performance index of the micro-ring is not affected, namely, the loop loss of the micro-ring is reduced, and the technical problem that the insertion loss is increased due to the increase of a transmission path due to the too large radius of the micro-ring in the related technology is solved.

The invention belongs to the field of particle accelerator microwaves, and particularly relates to a C-band compact spherical microwave pulse compression device which comprises a shell, a dual-polarization mode coupler and a circular waveguide, a spherical energy storage cavity is formed in the shell, and the circular waveguide and the spherical energy storage cavity are communicated through a coupling hole; the dual-polarization mode coupler comprises a rectangular waveguide, a butterfly-shaped matching section and a cylindrical matching section. According to the klystron radio frequency pulse compression circuit, the radio frequency pulse with the pulse width of 2.5 microseconds of the klystron can be compressed to 300ns, the average power gain in a single pulse is more than 4 times, the peak power gain is 6.3 times, and the compression efficiency is about 54%. According to the dual-polarization mode coupler, the functions of power distribution, mode conversion and polarization mode generation are synchronously realized, a TE10 mode in a rectangular waveguide is converted into two polarization TE11 modes which are equal in amplitude and orthogonal in phase, and then the two orthogonal TE114 modes are excited in a spherical energy storage cavity.

The invention provides a desensitization easy-to-process high-power millimeter wave waveguide matching load and application, the desensitization easy-to-process high-power millimeter wave waveguide matching load comprises a circular waveguide horn antenna and a high-loss dielectric block used for absorbing electromagnetic waves, and the circular waveguide horn antenna comprises a standard rectangular waveguide section, a rectangular waveguide-circular waveguide transition structure, a circular waveguide section, a conical horn and a circular waveguide section; the high-loss dielectric block comprises a bottom circular truncated cone, a middle circular truncated cone and a top circular truncated cone structure which are connected in sequence; the top circular truncated cone structure is a gradually-changing solid structure or a core-removing structure with a wedge-shaped block removed, and electromagnetic waves are fed into the circular waveguide horn antenna from the rectangular waveguide and are converted into dielectric loss by the high-loss dielectric block when reaching the tail of the horn antenna, so that incident electromagnetic energy is absorbed, and the dielectric loss of the horn antenna is reduced. The top circular truncated cone structure of the dielectric block is used for impedance matching and reflection reduction; the core circular truncated cone structure of the core-removing structure further reduces the sensitivity of the matching load performance to the precision error of the dielectric block due to the fact that the matching structure is located at the position with a weak electric field.

The invention discloses a compact type broadband circular waveguide TM01-TE01 mode converter, and relates to a TM01-TE01 mode converter. The antenna is composed of a circular waveguide TM01 mode power divider, N rectangular waveguide polarization bending structures and a circular waveguide TE01 mode synthesizer, and the circular waveguide TM01 mode power divider, the N rectangular waveguide polarization bending structures and the circular waveguide TE01 mode synthesizer are symmetrically arranged in a central rotation mode along a central axis. The circular waveguide TM01 power divider is composed of an input circular waveguide, an arc chamfer structure, a disc waveguide, an H-surface disc-shaped output structure and a circular-truncated-cone-shaped matching structure. The rectangular waveguide polarization bending structure is composed of two E-plane rectangular bent waveguides and a rectangular waveguide. And the circular waveguide TM01 mode power divider and the circular waveguide TE01 mode synthesizer are rotationally staggered by Psi along the central axis. The circular waveguide TE01 synthesizer is composed of an output circular waveguide, a second arc chamfer structure, a second disc waveguide, an E-surface disc-shaped input structure and a conical matching structure. The power capacity and the transmission efficiency are high, the axial size is small, and the relative working bandwidth with the transmission efficiency larger than 95% is wide.

A waveguide apparatus, associated components and methods. The waveguide device may include a rectangular waveguide having a first rectangular port and a second rectangular port at one end, and a first circular waveguide and a second circular waveguide extending from a broad side opposite the waveguide to provide full isolation or full transmission between the first port and the second port. The waveguides may include a fixed short circuit at one circular waveguide and a short circuit with an adjustable bias structure at the other circular waveguide to accommodate a wider range of high power capabilities. The waveguide devices may be stacked by connecting circular waveguides of adjacent structures to provide an isolator with additional ports or adjustable directional couplers. The adjustable shorting structure may include a plunger or a helical thread. The waveguide may include a rectangular waveguide in a four-port network in which the circular waveguide extends to a fifth port supporting two modes of operation and may be shorted by a contoured disk of non-reciprocal material.

The invention discloses a gradient refractive index efficient microwave heater and an analogue simulation method, and relates to the technical field of microwave heating devices.The heater comprises an asymmetric transmission circular waveguide, a transition part, a cylindrical medium and a heating load which are sequentially communicated, and the outer diameter of the cylindrical medium is smaller than that of the asymmetric transmission circular waveguide; the transition part is a connecting piece for connecting the asymmetric transmission circular waveguide and the cylindrical medium, the tail end part of the cylindrical medium extends into the heating load, and a metasurface structure with a gradient refractive index is arranged in the asymmetric transmission circular waveguide. One-way transmission of electromagnetic waves is achieved through the metasurface structure with the gradient refractive index, and then electromagnetic energy is concentrated into a medium used for plug-in heating. According to the heater, the cylindrical medium is inserted into the load to efficiently heat materials with different shapes, the dielectric constant range of the materials changes from 8 to 80, and a simulation result shows that the heating efficiency is always higher than 90% when the dielectric constant of the load is in the dynamic range of 8-80.

The invention discloses a relativistic magnetron with an energy feedback structure, and belongs to the technical field of microwaves. The relativistic magnetron is of a full-cavity extraction structure and comprises an anode, a cathode, an energy extraction structure and a guide magnetic field coil. According to the energy extraction structure, an annular microwave reflecting plate is adopted in an output circular waveguide part, part of energy is reflected back to a gap between a cathode and an anode, the interaction between electron cloud and space electromagnetic waves is enhanced, and the output power of a relativistic magnetron is improved. According to the relativistic magnetron, the output power of the relativistic magnetron is effectively improved while the compactness of the device is ensured; meanwhile, the energy feedback structure is simple and easy to process.

The invention discloses a directional coupler suitable for gradient circular waveguide microwave power measurement and a power measurement method.The directional coupler comprises a circular waveguide gradient transition section of a cone structure, the two ends of the gradient transition section are connected with circular straight waveguide sections of different diameters respectively, and a rectangular coupling cavity is formed in the upper portion of the outer wall of the circular waveguide gradient transition section; coaxial interfaces with different coupling degrees are respectively arranged at the two ends of the rectangular coupling cavity, and the rectangular coupling cavity is used for coupling microwave signals transmitted by the circular waveguide and coupling TE11 or TM01 mode microwaves transmitted by the circular waveguide to a coaxial TEM mode. The directional coupler has the advantages of being high in coupling degree, high in power capacity, good in directionality and the like, overcomes the defects that an existing directional coupler is complex in structure, low in coupling degree, low in power capacity, poor in directionality and the like, and can directly convert a TE11 mode or a TM01 mode transmitted by the circular waveguide into a coaxial TEM mode on the circular waveguide transition section to be coupled to a coaxial interface. And directional coupling and measurement of high-power microwaves are realized.

The present disclosure provides a dual-band dual-polarization splitter connecting a cross-shaped waveguide power divider to with an E-plane waveguide magic T and an ortho-mode transition through an E / H-plane 90° curved waveguide to form a new type of coaxial waveguide ortho-mode transition, thereby implementing the structure of coaxial circular waveguide feeding in high and low frequencies at the same time, reducing the length of the high-frequency transmission line, and reducing the transmission loss. Meanwhile, the present disclosure implements dual-polarization transmission in each frequency band, and can flexibly switch between vertical polarization and horizontal polarization when the dual-polarization has been converted to the single-polarization.

According to one embodiment, an introduction-side rectangular waveguide tube and a lead-out-side rectangular waveguide tube are each connected to a circular connection plate connected to an end surface of the circular waveguide tube, and at least one connection plate includes, in an outer circumference thereof, the other welding collar welded to the one welding collar, and both the one welding collar and the other welding collar include grooves or holes for a rotation regulation jig to regulate rotation in a circumferential direction, and an entire portion along the circumferential direction including the grooves or holes is welded and fixed thereto.

The invention provides a Faraday isolator which is characterized in that a circular waveguide is integrally X-shaped, four corners adjacent to the circular waveguide are respectively provided with a threaded hole, two sides of the circular waveguide are respectively provided with an X-shaped cavity, a steel sheet is X-shaped, a pair of step waveguides are respectively arranged on two sides of the circular waveguide, and a pair of step waveguides are respectively arranged on two sides of the steel sheet. The pair of steel sheets, the ferrite, the absorber and the plurality of magnetic steels are all installed in the circular waveguide, the plurality of magnetic steels are arranged around the ferrite, the pair of ceramic cones with membranes are respectively installed at two ends of the ferrite, the pair of support rings are respectively installed at two sides of the absorber, and the pair of support rings are respectively installed at two ends of the absorber. The middle parts of the pair of stepped waveguides are provided with stepped waveguide inner cavities, the middle part of the circular waveguide is provided with a circular waveguide inner cavity, and one ends, far away from the ferrite, of the pair of ceramic cones with films respectively penetrate through the pair of supporting rings and respectively extend into the stepped waveguide inner cavities of the pair of stepped waveguides. The inner cavity of the stepped waveguide and the inner cavity of the circular waveguide are both provided with gold-plated surfaces.

The invention discloses a microwave antenna with a low side lobe. The microwave antenna comprises a main reflecting surface, a feed source and a surrounding edge, wherein the main reflecting surface is of a rotating paraboloid structure, and a feed source is arranged at the focus of the main reflecting surface; the feed source comprises a radiation source, an auxiliary reflecting surface, a circular waveguide and a dielectric ring arranged on the splashing plate; the surrounding edge is arranged around the edge of the main reflecting surface and is used for absorbing signals exceeding the receiving range of the main reflecting surface; geometric parameters of the dielectric ring are configured to enable a feed source directional diagram to conform to improved generalized Taylor displacement distribution, an expression of the improved generalized Taylor displacement distribution is # imgabs0 #, rb is a center shielding radius, B1 is a constant larger than 0.45, J0 is a value of a first zero point of a zeroth-order Bessel function, and the feed source directional diagram is adjusted by adjusting the geometric parameters of the dielectric ring on the basis of the expression. And the microwave antenna can achieve the effect of low side lobe.

The present invention discloses a rapid switching device for a Ku and Ka dual-frequency transceiver assembly, which includes a base, an azimuth electrical compartment arranged on the base, an external battery and an elevation electrical compartment arranged on the azimuth electrical compartment, and an antenna surface and a polarization rotation assembly arranged on the elevation electrical compartment. One end of a Ku circular waveguide extension passing through the antenna surface is provided with a Ku feed rod, and the other end is provided with a Ku transceiver. This rapid switching device for the Ku and Ka dual-frequency transceiver assembly facilitates the rapid replacement of the Ku / Ka frequency bands, while retaining the automatic polarization satellite alignment rotation, ensuring that the overall weight of the device is relatively light and it is convenient to use. If the polarization of the Ku frequency band needs to be manually adjusted, then each time it is necessary to log in to the device wirelessly or wired to view the current polarization angle; or manually switch after finding the polarization angle through the screen, and the device is very inconvenient to use.

The application discloses a ternary computing method and system based on a double-chain difference coupling principle. A difference value (XnYn) is directly generated by a forward component Xn and a reverse component Yn in a difference coupling area, forming a three-value logic {‑1, 0, +1}, and a threshold comparison circuit is omitted, and operation follows BH=Σ(XnYn)×3^n. A hierarchical logic system composed of basic operators, minimum complete operators and global operators is constructed, and arbitrary three-value logic operation is realized; a circular waveguide structure is adopted to configure an optical path difference, so that coherent light directly forms three interference states at an output end, and optical three-value logic gates and optical full adders are realized; a double-chain six-bit structure is adopted for symbol coding, a two-dimensional geometric framework is driven to generate a symbol form, and logical and geometric expression unification is realized.

The invention discloses a ridge loading multipath synthesis TE02 mode input coupler with a high electron beam flow rate, and belongs to the technical field of microwave and millimeter wave electric vacuum devices. The input coupler comprises a power distribution network part, a ridge loading multipath synthesis part and a three-stage cascade circular reflection waveguide part. The waveguide ridge is arranged on the side wall of the main circular waveguide, and the length, the width and the depth of the waveguide ridge are adjusted to suppress main competition modes (TE01 and TE41) of a TE02 mode in the main circular waveguide, so that the effects of suppressing a miscellaneous mode, reducing a reflection coefficient, improving conversion efficiency and expanding input bandwidth are achieved. Meanwhile, the cascade circular reflecting waveguide can totally reflect a TE02 mode, and the inner radius of the cascade circular reflecting waveguide is larger than that of a cut-off waveguide of a traditional input coupler, so that the probability of electron interception is reduced, and the flow rate of electron beams is improved.

The present invention discloses a broadband, high-efficiency circular waveguide TE31 mode exciter, belonging to the field of microwave and millimeter wave technology. The exciter comprises a standard TE10 mode rectangular waveguide section, a TE10 mode-TE30 mode conversion section, a standard TE30 mode rectangular waveguide section, a TE30 mode-TE31 mode conversion section, and a TE31 mode circular waveguide section, all connected in sequence. The excitation process of the TE31 mode exciter is divided into two steps: first, converting the TE10 mode to the TE30 mode, and then converting it to the TE31 mode. With the cooperation of a power divider, a torsion waveguide, and a gradient waveguide, the conversion from the rectangular waveguide TE10 mode to the circular waveguide TE31 mode is achieved, reducing losses during the conversion process and ensuring conversion efficiency.

The invention discloses a millimeter wave communication antenna broadband feed source network four-port device and an application method thereof, and relates to the technical field of microwave communication, the millimeter wave communication antenna broadband feed source network four-port device comprises a circular rectangular transition structure, a circular polarizer and an orthogonal mode coupling duplexer assembly which are integrated in sequence; the circular rectangular transition structure is used for corresponding conversion transition between the standard rectangular waveguide and the circular waveguide; the circular polarizer is provided with an orthogonal stepped ridge, so as to convert the circularly polarized wave into an orthogonal linearly polarized wave or convert the orthogonal linearly polarized wave into the circularly polarized wave corresponding to the signal receiving and transmitting direction; the orthogonal mode coupling diplexer assembly is used for separating the two paths of orthogonal linear polarized waves in the synthetic state or synthesizing the two paths of orthogonal linear polarized waves in the separated state corresponding to the signal receiving and transmitting direction, and can screen signals passing through a specific receiving and transmitting frequency band. The technical problems that in the prior art, a dual-polarized antenna technology for dual-channel communication is large in size, complex in structure and high in cost, and the overall performance is difficult to meet expected requirements are solved.

The invention discloses a spiral structure waveguide for vortex light topological charge conversion and an implementation method thereof, and belongs to the field of optical waveguides. The circular waveguide and the spiral structure are combined, the spiral structure is used for regulating and controlling the vortex light mode according to the mode conversion matching condition, and vortex light conversion between any topological charge orders is achieved; according to the invention, complete conversion between different vortex lights is realized, two vortex light mixed beams with different proportions can be generated, and the requirements of generation and utilization of vortex lights with different orders in an integrated photonics on-chip structure are met. According to the method, the problem that topological charges cannot be freely converted among different vortex light modes in a waveguide structure is solved, the application value of the waveguide structure in the aspect of vortex light regulation and control is expanded, and the possibility is provided for an integrated photon platform to utilize vortex light topological charge degree-of-freedom coding information and process calculation tasks. According to the invention, information coding, optical communication, calculation and other applications are carried out by changing the topological charge of the vortex light.

A cap feed source structure disclosed by the present invention comprises a protective cap, a medium support member and a circular waveguide, the circular waveguide and the medium support member are fastened through a triangular step, and the medium support member and the protective cap are fastened through a thread. The medium supporting piece is made of cross-linked polystyrene, so that the stable wave-transparent performance of the whole material is ensured; the upper end surface of the dielectric support member is metalized to ensure the microwave reflection efficiency of the end surface; metallization treatment is carried out on the upper end surface of the medium supporting piece, a mature vacuum plating process is adopted, copper plating and nickel plating are carried out on the material, and a plating layer is firm and reliable; the circular waveguide and the dielectric support member are assembled by a process of first partial assembly and then welding forming, so that the connection quality of the two devices is effectively ensured; the protective cap is made of a cross-linked polystyrene material and protects the metalized surface of the upper end of the supporting medium piece.

The invention discloses a quasi-single-mode circular waveguide conical horn antenna, a radar and a communication device. The quasi-single-mode circular waveguide conical horn antenna comprises a circular waveguide section and a conical horn section. Conductor loss is reduced by remarkably increasing the diameter of the circular waveguide, and axial periodic annular grooves are formed in the inner wall of the circular waveguide to form a spatial mode filter and a selective attenuation high-order mode, so that high radiation efficiency and high mode purity are realized at the same time in a millimeter wave frequency band. And the conical horn section adopts an index profile to realize high-directionality radiation. The antenna structure effectively solves the technical problems of large loss and impure mode in a millimeter wave high-frequency band in the traditional design.

The present invention discloses a microwave-assisted high-temperature cracking device, including a microwave reactor and a feeding system. The microwave reactor includes a metal head, a metal cavity, a resonant cavity, a circular waveguide, a rectangular waveguide and a magnetron arranged from top to bottom; an absorbing material plate is fixed between the metal cavity and the resonant cavity, and a droplet micronizing feeder and a discharge port with adjustable spray height are provided on the metal head. The droplet micronizing feeder is used to spray fine droplets onto the upper surface of the absorbing material plate to perform a high-temperature cracking reaction. The present invention uses the metal head, the metal cavity and the absorbing material plate as a reaction site after being sealed by a flange, which not only realizes the flash heating process of the absorbing material plate but also effectively avoids the leakage of the reactant caused by the rupture of the reactor at high temperature. Through the circulation process of the material to be cracked in the outer jacket of the waveguide at the bottom of the device, it can not only preheat the material to be cracked but also reduce the heat transfer from the high-temperature metal reactor to the microwave generator, thereby realizing the effective circulation of energy.

A triple-mode monopulse tracking antenna and antenna system with risley prism beam steering. In particular, a monopulse tracking antenna, comprising: a triple-mode circular waveguide horn, configured to generate three monopulse patterns; at least two Risley prisms, each positioned a fixed distance from the triple-mode circular waveguide horn, configured to receive and steer the three monopulse patterns, wherein each Risley prism is coated with an anti-reflective layer; a means for axially rotating each of the at least two Risley prisms; and a parabolic phase correcting surface, positioned intermediately between the triple-mode circular waveguide horn and at least two Risley prisms.

The invention discloses a broadband circular waveguide TE01 mode exciter based on a crossed ridge waveguide, and relates to the technical field of microwaves. The exciter comprises a rectangular waveguide four-path power division feed structure for dividing the power of a TE10 mode into four paths, a crossed ridge waveguide TE22 mode forming structure for synthesizing the four paths of TE10 modes into a crossed ridge waveguide TE22 mode, and a circular waveguide TE01 mode forming structure for converting the crossed ridge waveguide TE22 mode into a circular waveguide TE01 mode. By introducing the crossed ridge waveguide structure, the directional regulation and control of waveguide dispersion are realized, and the cut-off frequency interval between a working mode and a parasitic mode is remarkably improved, so that the bandwidth is expanded. A crossed fan-shaped structure is introduced to serve as a middle structure of the crossed ridge waveguide and the circular waveguide, the cut-off phenomenon caused by sudden change of the waveguide shape is avoided, and the working bandwidth is further expanded. The high-purity and high-efficiency broadband filter has the advantages of being high in purity, high in efficiency, wide in frequency band and high in compactness, meanwhile, the structure is simple, machining and assembling are easy, and good engineering practicability is achieved.

In one embodiment, the present disclosure is directed to a system for providing improved electric field uniformity to a plasma chamber receiving multiple signal inputs. The system includes one or more dielectrics distributing received energy to one or more antennas. The one or more dielectrics have N receiving areas. N circular waveguides are positioned over the N receiving areas. Each of waveguides has a mode converter converting a received first transverse mode signal to a second transverse mode signal to be output by the circular waveguide to the corresponding receiving area. At least one phase adjuster circuit adjusts the phase of at least one of the first transverse mode signals such that adjacent circular waveguides have their received first transverse mode signals differ in phase by approximately 360 / N.

The present invention relates to the field of semiconductor laser technology, and specifically to a vertical cavity surface emitting laser and a preparation method thereof, wherein the laser comprises a substrate, an epitaxial layer is arranged on the substrate, and is characterized in that a first electrode, a second electrode, a first etched area and a second etched area are arranged on the epitaxial layer, the first etched area and the second etched area are arranged in the epitaxial layer, and the first etched area surrounds to form a truncated cone waveguide, and the first electrode is arranged on the top of the truncated cone waveguide; the two etched areas are connected to the first etched area, and an organic polymer is arranged inside the first etched area and the second etched area to form an organic polymer layer, and the second electrode is drawn out from the first electrode and extends above the second etched area. The present invention can reduce the equivalent dielectric constant of the epitaxial layer between the electrodes, reduce the parasitic capacitance of the chip, and improve the modulation bandwidth and transmission rate of the vertical cavity surface emitting laser.

The present invention discloses a compact high-power waveguide radial power distributor / synthesizer, the purpose of which is to solve the problems of narrow bandwidth, large lateral size, low power capacity, etc. of the existing power distributor / synthesizer. The present invention is composed of three parts, namely, a conical circular waveguide-coaxial waveguide transition structure, a coaxial waveguide-circumferential rectangular waveguide array transition structure, and a circular curved waveguide array, which are sequentially coaxially connected and arranged in a central rotational symmetric manner along the central axis. The conical circular waveguide-coaxial waveguide transition structure is composed of a circular waveguide, a conical circular waveguide-coaxial transition waveguide, and a coaxial waveguide; the coaxial waveguide-circumferential rectangular waveguide array transition structure is composed of N fan-shaped-rectangular waveguide transition sections arranged circumferentially around the central axis; the upper end of the coaxial waveguide-circumferential rectangular waveguide array transition structure is a section surrounded by N fans, and the lower end is a section surrounded by N rectangles. The circular curved waveguide array is composed of N curved waveguides. The present invention has a wide working frequency band, a small lateral size, and a power capacity of the order of GW.

The application discloses a gynecological millimeter wave therapeutic instrument, which comprises a host computer, an antenna mechanism connected with the host computer, the antenna mechanism comprising sequentially connected circular waveguide, millimeter wave antenna and antenna protective cover, the host computer and the antenna mechanism being connected along the same axial direction. The host computer comprises a millimeter wave source and a wave form conversion and attenuation device, the wave form conversion and attenuation device comprising an attenuation unit and a wave form conversion unit integrated into one mechanism, the attenuation unit being connected with the millimeter wave source through a flange, the wave form conversion unit being connected with the circular waveguide, the attenuation unit being adapted to attenuate the millimeter wave power emitted by the millimeter wave source to a target value, and the wave form conversion unit being adapted to convert the field type of the millimeter wave after power attenuation from TE10 wave in the rectangular waveguide into circular polarization wave in the circular waveguide, so as to provide the required millimeter wave output power for the millimeter wave antenna. The gynecological therapeutic instrument can perform accurate irradiation treatment in the gynecological cavity, and can ensure a larger millimeter wave adjustment range without changing the millimeter wave source.