CN103647128B

CN103647128B - A kind of high power RADIAL hermetyic window

Info

Publication number: CN103647128B
Application number: CN201310715752.1A
Authority: CN
Inventors: 张健穹; 刘庆想; 李相强; 王邦继; 张政权; 王庆峰; 杨志军
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2013-12-23
Filing date: 2013-12-23
Publication date: 2016-05-11
Anticipated expiration: 2033-12-23
Also published as: CN103647128A

Abstract

The invention discloses a kind of high power RADIAL hermetyic window, mainly solved the hermetyic window for RADIAL that lacks a kind of maturation existing in prior art, can not meet the problem of technical development demand. This high power RADIAL hermetyic window comprises RADIAL upper plate and RADIAL lower plate, be installed on the RADIAL between RADIAL upper plate and RADIAL lower plate, with RADIAL lower plate coaxial waveguide connected vertically, the conversion cone on RADIAL upper plate is fixed in upper end, between RADIAL upper plate and RADIAL lower plate, conversion cone outside and the ceramic ring coaxial with coaxial waveguide, described coaxial waveguide center position is provided with inner wire, and this inner wire is connected with conversion cone lower end. By such scheme, the present invention reached reflect little, efficiency of transmission is high, power capacity is high and be applicable to the object of RADIAL, has very high practical value and promotional value.

Description

A kind of high power RADIAL hermetyic window

Technical field

The present invention relates to a kind of hermetyic window of High-Power Microwave technical field, specifically, relate to a kind of high power RADIAL hermetyic window.

Background technology

Along with the development of High-Power Microwave technology, people have proposed more and more higher requirement to the use of High Power Microwave System. Because high power RADIAL array antenna is easy to realize high-gain, high efficiency, high power and the circular polarization radiation etc. of antenna, aspect high power applications, obtain research widely. The high power RADIAL array antenna before studied does not have hermetyic window, needs pair array antenna inside to vacuumize processing, and ensure that its vacuum meets the demands to prevent that air breakdown from affecting performance in order to realize high power capacity. But because array antenna inner space is larger, sealing part and position are more, difficulty that entirety vacuumizes is large and reliability is low. In order further to improve and optimize the topological structure of high power RADIAL array antenna, a kind of mode is proposed now: in RADIAL, add hermetyic window, and carry out vacuum seal in hermetyic window position, so just can only need vacuumize processing to region between hermetyic window to coaxial waveguide, in RADIAL, other regions can meet by being filled with inert gas the power capacity demand of array antenna. Therefore, RADIAL hermetyic window performance quality will directly affect the performance of antenna.

Hermetyic window is widely used in microwave device, and its form has a variety of. as far back as nineteen fifty-five American H.KJENNY and F.E.VACCAPO, notch cuttype output window chip architecture [HKJenny.AStep-Type is proposed, Broadband, X-BandCeramicWaveguideWindow[J] .IEEETransactionsonelectrondevices, 1956], extend two ladders on medium both sides, the length of ladder and the thickness of middle window are all 1/4th of its place waveguide partial waveguide wavelength, realize impedance matching with the rectangular waveguide on window both sides, and this kind of output window is directly embedded in rectangular waveguide. the Lipton window of Li Dun company exploitation has solved the contradiction of bandwidth and gain, but be only applicable to the situation that dielectric constant is less, and Bruce window to have solved output waveguide be generally circular waveguide or the coupling application of elliptical waveguide in broadband, window thickness generally gets the integral multiple of half-wavelength. calendar year 2001 doctor GeorgeStephensonHaldeman delivers MIT paper, adopt output window structure [GeorgeStephensonHaldeman.ANovelvacuumWindowforMegawattGy rotrons[D] .US:MIT of double-layer circular arcuation, 2001], centre passes to cooling agent, greatly improved its mechanical ability to bear and heat-sinking capability, power output can reach 2.1 megawatts, and these forms can be used in rectangular waveguide. the people such as X.Yang in 2003 adopt CVD Buddha's warrior attendant masonry window material, obtain in the 500MHz bandwidth of centre frequency left and right, reflection is lower than the output window [XYang of-20dB, etal.AnalysisofTransmissionCharacteristicsforSingleandDo ubleDiskWindow.200227thInternationalConferenceonInfrared andMillimeterWaves, 2002], but because the process of window material is easily brought defect to forms, as the extra free charge that likely can bring in diamond machined and encapsulation process, the forms added losses that bring thus account for the 20%-30% of total losses, therefore in process, must ensure High-Power Microwave output forms quality of materials. U.S. CliftonC.Courtney in 2010 has invented and has a kind ofly been suitable for rectangular waveguide and is operated in output window [CliftonC.Courtney.Highpeakandaveragepower-capablemicrowa vewindowforrectangularwaveguide[P] .USPatent2010 under basic mode state], this structure is divided into multilayer by window material with sheet metal, sheet metal is perpendicular to direction of an electric field, and terminate in the narrow limit of waveguide, because such structural design can effectively suppress secondary electron multiplication, improve the power output of High-Power Microwave output window, simultaneously because sheet metal has good conductive capability, can eliminate in time the additional charge on medium, reduce added losses. Beijing vacuum electronic technical research institute carries out feasibility analysis [Zhao Changjiang with simulation calculation aspect to a kind of novel waveguide output window-elliptical waveguide output window from theoretical, Wang Yanmei. the simulation study of elliptical waveguide output window. vacuum electronic technology, 2010], result is presented at 18-40GHz frequency range standing internal wave coefficient below 1.4, and checking elliptical waveguide window is as the feasibility of helix TWT output window.

Above-mentioned result of study shows, the hermetyic window that at present extensive use is used mainly contains box type window, rectangular window, ladder window and meets the window etc. of other shapes of special requirement, be mainly used in the sealing of rectangular waveguide, coaxial waveguide, circular waveguide etc., and have not been reported for the microwave seal window that is applied to RADIAL.

Under this background, the present invention proposes a kind of high power RADIAL hermetyic window, in order to adapt to industry development demand.

Summary of the invention

The object of the present invention is to provide a kind of high power RADIAL hermetyic window, mainly solve the hermetyic window for RADIAL that lacks a kind of maturation existing in prior art, can not meet the problem of technical development demand.

To achieve these goals, the technical solution used in the present invention is as follows:

A kind of high power RADIAL hermetyic window, comprise RADIAL upper plate and RADIAL lower plate, be installed on the RADIAL between RADIAL upper plate and RADIAL lower plate, with RADIAL lower plate coaxial waveguide connected vertically, the conversion cone on RADIAL upper plate is fixed in upper end, between RADIAL upper plate and RADIAL lower plate, conversion cone outside and the ceramic ring coaxial with coaxial waveguide, described coaxial waveguide center position is provided with inner wire, this inner wire is connected with conversion cone lower end.

Specifically described conversion cone is reverse frustoconic structure.

Further, described RADIAL upper plate and RADIAL lower plate are ledge structure, fixing conversion cone and ceramic ring position indent on RADIAL upper plate, in RADIAL lower plate with RADIAL upper plate in recessed position corresponding position indent.

As preferably, between described ceramic ring and RADIAL upper plate, all adopt metallization sealing-in mode to be connected between ceramic ring and RADIAL lower plate.

Compared with prior art, the present invention has following beneficial effect:

(1) the invention discloses a kind of microwave seal window that meets RADIAL demand, and further improve and optimized the topological structure of high power RADIAL array antenna, greatly improve its reliability, meet the vacuum seal demand of feed, there is feature simple in structure, power capacity is high, meet technical development demand, there is outstanding substantive distinguishing features and marked improvement, be applicable to large-scale promotion application.

(2) in the present invention, being connected between ceramic ring and RADIAL upper plate and RADIAL lower plate adopts metallization sealing-in, thereby can guarantee inner vacuum seal completely, and upper plate and lower plate all adopt ledge structure, thereby can reduce the electric-field intensity at three phase point place, realize the high power capacity of whole hermetyic window, fully guaranteed the service behaviour of RADIAL.

(3), in when application, the size that converts cone, ceramic ring and the outstanding structure corresponding with interior recessed position by adjusting just can realize the matched well by coaxial waveguide place input power, implement very convenient, realistic demand.

Brief description of the drawings

Fig. 1 is cutaway view of the present invention.

Fig. 2 is top view of the present invention.

In above-mentioned accompanying drawing, the component names that Reference numeral is corresponding is as follows:

1-coaxial waveguide, 2-converts cone, 3-RADIAL, 4-ceramic ring, 5-gives prominence to structure;

3a-RADIAL upper plate, 3b-RADIAL lower plate.

Detailed description of the invention

Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.

Embodiment

In order to solve the hermetyic window for RADIAL that lacks a kind of maturation existing in prior art, can not meet the problem of technical development demand, as shown in Figure 1 and 2, the invention discloses a kind of high power RADIAL hermetyic window, comprise that coaxial waveguide 1, conversion cone 2, RADIAL 3, ceramic ring 4, outstanding structure 5, RADIAL upper plate 3a and RADIAL lower plate 3b(are called for short lower plate and upper plate in the present embodiment), its concrete mounting means is as follows:

RADIAL 3 is installed between RADIAL upper plate 3a and RADIAL lower plate 3b; Coaxial waveguide 1 and vertical connection of RADIAL lower plate 3b; Conversion cone 2 is reverse frustoconic structure, and RADIAL upper plate 3a upper and lower end is fixed in its upper end and RADIAL 3 inner wires join (inner wire is arranged at coaxial waveguide 1 center position); Ceramic ring 4 between RADIAL upper plate 3a and RADIAL lower plate 3b, conversion cone 2 outsides and coaxial with coaxial waveguide 1, preferably will be between ceramic ring 4 and RADIAL 3 adopt the sealing-in of metallizing be connected.

In order to reduce the electric-field intensity at three phase point place, realize the high power capacity of whole hermetyic window, RADIAL upper plate 3a and RADIAL lower plate 3b are all set to ledge structure, wherein, RADIAL upper plate 3a is inner concave shape, and conversion cone 2 and ceramic ring 4 are located thereon interior recess, on RADIAL lower plate 3b and the interior recessed position of RADIAL upper plate 3a corresponding position indent, according to the actual requirements, adjustable for height outstanding structure 5 can be set, i.e. outer male structure.

When enforcement, only need regulate the size of conversion cone, ceramic ring and outstanding structure just can in order to realize by the matched well of coaxial waveguide place input power.

Empirical tests shows, when microwave operational frequencies is 2.856GHz; Coaxial waveguide internal and external conductor radius is respectively 14.5mm and 6.5mm; Outstanding structure is with respect to upper and lower plates outstanding 4mm and the 8mm respectively of RADIAL; Conversion cone radius is 33mm, high 58.5mm; When ceramic ring internal diameter 36mm, thick 3mm, numerical simulation result is:

In 2.7 ~ 3GHz frequency band range, high power RADIAL hermetyic window reflectance factor is less than 0.1, ceramic ring surface maximum field intensity is 179V/m and is positioned at intermediate position, and three phase point maximum field strength is 133V/m, calculates the about 150MW of design power capacity of sealing window according to threshold of air breakdown. The above results shows, it is little that this high power RADIAL hermetyic window has reflection, the characteristic that power capacity is high.

According to above-described embodiment, just can realize well the present invention.

Claims

1. a high power RADIAL hermetyic window, it is characterized in that, comprise RADIAL upper plate (3a) and RADIAL lower plate (3b), be installed on the RADIAL (3) between RADIAL upper plate (3a) and RADIAL lower plate (3b), with RADIAL lower plate (3b) coaxial waveguide connected vertically (1), the conversion cone (2) on RADIAL upper plate (3a) is fixed in upper end, be positioned between RADIAL upper plate (3a) and RADIAL lower plate (3b), conversion cone (2) outside and the ceramic ring (4) coaxial with coaxial waveguide (1), described coaxial waveguide (1) center position is provided with inner wire, this inner wire is connected with conversion cone (2) lower end, described RADIAL upper plate (3a) and RADIAL lower plate (3b) are ledge structure, fixing conversion cone (2) and ceramic ring (4) position indent on RADIAL upper plate (3a), RADIAL lower plate (3b) goes up and the interior recessed position of RADIAL upper plate (3a) corresponding position indent.

2. a kind of high power RADIAL hermetyic window according to claim 1, is characterized in that, described conversion cone (2) is reverse frustoconic structure.

3. a kind of high power RADIAL hermetyic window according to claim 2, is characterized in that, all adopts metallization sealing-in mode to be connected between described ceramic ring (4) and RADIAL upper plate (3a), between ceramic ring (4) and RADIAL lower plate (3b).