CN207165721U - A kind of millimeter wave multi-frequency multi-mode mode excitation device - Google Patents
A kind of millimeter wave multi-frequency multi-mode mode excitation device Download PDFInfo
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- CN207165721U CN207165721U CN201621232425.6U CN201621232425U CN207165721U CN 207165721 U CN207165721 U CN 207165721U CN 201621232425 U CN201621232425 U CN 201621232425U CN 207165721 U CN207165721 U CN 207165721U
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- mode
- frequency
- excitation device
- millimeter wave
- circular waveguide
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Abstract
The utility model belongs to vacuum electronics technical field, is related to a kind of wave-guide mode excitation device.A kind of millimeter wave multi-frequency multi-mode mode excitation device, including：One circular waveguide corrugated horn, for producing HE11Pattern；One plan-convex di-lens, for by HE11Mode conversion is TEM00Pattern；One quasi- parabolic reflector, for by incidence TEM00Focus of the electromagnetic wave convergence of pattern to quasi- parabolic cylinder；The coaxial resonant cavity of one side-wall hole, for producing the higher order mode of circular polarisation, and suppress other parasitic modes；Circular waveguide corrugated horn is conllinear with plan-convex di-lens, and the focus of quasi- parabolic reflector is located on the caustic surface of coaxial resonant cavity, and coaxial resonant cavity is horizontal positioned, and its axis is vertical with the axis antarafacial of circular waveguide corrugated horn.Millimeter wave multi-frequency multi-mode mode excitation device of the present utility model, it is compact-sized, working band is wide, flexible adjustment, extension is convenient, the mode purity of excitation is higher.
Description
Technical field
The utility model belongs to vacuum electronics technical field, is related to a kind of wave-guide mode excitation device.
Background technology
Gyrotron millimere-wave band have the advantages that high power, long pulse, continuous wave output, millimetre-wave radar,
The fields such as plasma heating, material process and the biomedicine of controlled thermonuclear fusion are with a wide range of applications.In recent years,
With the progress of cryogenic magnetic field technology, gyrotron can realize that frequency step tunes.The breakthrough of this technology can improve
The controllability of gas ions heating progress, significantly reduce development and the production cost of heater.The height that gyrotron uses
Rank mode of operation needs to convert the low step mode for ease of transmitting or directly utilizing by aiming light mode converting means.Frequency step
Tuning gyrotron requires that quasi-Optical Mode Converter therein can operate at multiple frequencies, and ensures corresponding with frequency more
Individual pattern realizes that high efficiency is changed.Aiming light mode converting means needs to carry out cold survey experiment in a pre-installation, and cold survey in experiment needs
Encourage the circular polarisation higher order mode TE of high-puritymnInput signal as device under test.
Encourage circular polarisation high-order TEmnThe method of pattern mainly has wave-guide cavity wave advocate approach and quasi-optics advocate approach.Waveguide cavity
Body advocate approach refers to use wave-guide cavity wave or probe directly excitation, is deformed with waveguide and cause mode conversion, by the low order of input
Mode conversion is higher order mode.But the difficulty of processing of irregular wave-guide cavity wave is big, mode purity is relatively low, and frequency band range is narrow, especially
It is by TE11It is transformed to TE22,6、TE28,8、TE34,17, it is necessary to which multiple mode conversion sequences, cause device during Deng pole higher order mode
Axial dimension sharply increase.Quasi-optics advocate approach is that input pattern first is converted into directrix plane high bass wave by antenna system
Beam, Gaussian beam is coupled to resonator using the focus characteristics of speculum, so as to encourage high-order to rotate TEmnPattern.But
Wave beam is coupled to resonator by traditional quasi-optics advocate approach using multiple mirror surfaces, and not only system complex, assembly alignment are stranded
Difficulty, capacity loss is big, and is only applicable to single-frequency, and system, which is formed, lacks flexibility, does not give full play to quasi-optics method
Broadband advantage.
Utility model content
In view of the shortcomings of the prior art and problem, the utility model provide a kind of millimeter wave multi-frequency multi-mode pattern and swashed
Device is encouraged, is the target that can be achieved to motivate multiple mode of operations under multiple working frequencies in working band using a set of device,
Can be as the cold signal source for surveying experiment of aiming light mode converting means in frequency-tunable gyrotron.
The utility model solves the technical scheme that its technical problem uses：A kind of millimeter wave multi-frequency multi-mode mode excitation dress
Put, including：
One circular waveguide corrugated horn, for producing HE11Pattern；
One plano-convex face di-lens, for by HE11Mode conversion is TEM00Pattern；
One quasi- parabolic reflector, for by incidence TEM00Jiao of the electromagnetic wave convergence of pattern to quasi- parabolic cylinder
Point；
The coaxial resonant cavity of one side-wall hole, for producing the higher order mode of circular polarisation, and suppress other parasitic modes；
Circular waveguide corrugated horn is conllinear with plano-convex face di-lens, and the focus of quasi- parabolic reflector is positioned at same
On the caustic surface of axle resonator, coaxial resonant cavity is horizontal positioned, and the axis antarafacial of its axis and circular waveguide corrugated horn hangs down
Directly.
Described circular waveguide corrugated horn includes circular waveguide input section, mode conversion section and conical gradual change ripple spoke
Section is penetrated, the input of corrugated horn is circular waveguide TE11Pattern, TE is produced by mode conversion section11And TM11Mixed mode HE11,
Conical gradual change section is used to suppress parasitic mode, and produces wide band electromagnetic radiation；Circular waveguide corrugated horn is by I-shaped bracket
It is fixed on platform.
Plano-convex face di-lens material is polytetrafluoroethylene (PTFE), and medium refraction index 1.35, the illuminated area of lens is convex surface,
Dark side is plane.The focus of lens overlaps with the phase center of corrugated horn, is fixed on by lens carrier on platform.
Quasi- parabolic reflector is defined parabola in vertical direction, is in the horizontal direction smooth cylinder, its profile equation
Determined by aplanatism principle.The fixing device of speculum is an adjustable support in direction, for adjusting the focus of speculum
Position.
The coaxial resonant cavity of side-wall hole uses three stage structure：End section, uniform segment and deferent segment；End section using half
The waveguide that footpath reduces ends mode of operation, and deferent segment forms radiant output, middle uniform segment using the waveguide of radius increase
For the main part of coaxial resonant cavity.
Described coaxial resonant cavity is made up of inner wire and outer conductor, the pattern of inner and outer conductor radius excitation needed for
Determined jointly with working frequency, coaxial resonant cavity passes on left blind flange closing, and outer conductor is fixed on platform by Troffer
On.
Couple electromagnetic energy structure in coaxial resonant cavity outer conductor sidewall is made up of m × n circular port, and wherein m is circle
The line number of circumferential direction hole array, n are the line number of waveguide axial direction hole array, and the radius in hole is 0.5mm, 15 ° of the angular spacing in hole, hole
Axial spacing 1.2mm.
Described circular waveguide corrugated horn, quasi- parabolic reflector, coaxial resonant cavity are made by one of following material
It is standby to form：Oxygen-free copper, aluminium or brass.
The operating frequency range of described millimeter wave multi-frequency multi-mode mode excitation device is 90 ~ 180GHz, using single frequency
Rate works, the corresponding incentive mode of each frequency.The operating frequency range of mode excitation device is divided into following frequency
Section：90-105GHz, 105-120GHz, 120-135GHz, 135-150GHz, 150-165GHz, 165-180GHz.Each work
The circular waveguide corrugated horn of the corresponding respective bandwidth of frequency range, using only needing to change corrugated horn during different band operations
Antenna, without changing miscellaneous part.
Millimeter wave multi-frequency multi-mode mode excitation device of the present utility model, compared with prior art, beneficial effect is：Knot
Structure is compact, working band is wide, flexible adjustment, extension is convenient, the mode purity of excitation is higher, is shaken available for frequency-tunable convolution
Swing cold survey experiment or other devices for using circular polarisation higher order mode to work of aiming light mode converting means in pipe.
Brief description of the drawings
Fig. 1 is the millimeter wave multi-frequency multi-mode mode excitation schematic device in the utility model embodiment；
Fig. 2 is the circular waveguide corrugated horn cut-away view in the utility model embodiment；
Fig. 3 is the circular waveguide corrugated horn illustraton of model in the utility model embodiment；
Fig. 4 is the circular waveguide corrugated horn E faces directional diagram in the utility model embodiment；
Fig. 5 is the di-lens structure chart in the utility model embodiment；
Fig. 6 is the quasi- parabolic reflector structure chart in the utility model embodiment；
Fig. 7 is the coaxial resonant cavity structural representation in the utility model embodiment；
Fig. 8 is the coaxial resonant cavity sidewall coupling hole array structure chart in the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme in the embodiment of the utility model is clearly and completely described.
The working frequency range of millimeter wave multi-frequency multi-mode mode excitation device is 90-105GHz in the present embodiment, target excitation mould
Formula is TE5,2、TE5,3、TE6,2、TE6,3,.Circular waveguide corrugated horn 1 of the mode excitation device including a millimere-wave band,
The coaxial resonant cavity 4 of the quasi- 3, side-wall holes of parabolic reflector of one plano-convex face di-lens 2, one, such as Fig. 1 institutes
Show.Circular waveguide corrugated horn 1 is fixed on platform by I-shaped bracket.
Mode excitation device provided by the utility model, by circular waveguide corrugated horn 1 by the standard TE of input11Mould
Formula is transformed to HE11Pattern, plano-convex face di-lens 2 is by HE11Mode conversion is the TEM that wave surface is plane00Pattern, quasi- parabolic
Cylindrical mirror 3 utilizes its distinctive focus characteristics by the TEM of incidence00The electromagnetic beam of pattern is same by coupling hole array feed-in
Axle resonant chamber 4, the focus of quasi- parabolic reflector 3 is located on the caustic surface 14 of coaxial resonant cavity 4, so as to motivate
The high-order cavity modes of rotation.
The working band scope of circular waveguide corrugated horn is 90-105GHz, by circular waveguide input section 7, mode conversion
Section 8 and conical gradual change corrugated radiation section 9 are formed, as shown in Figure 2.The signal of the corrugated horn inputted through circular waveguide input section 7
For circular waveguide TE11Pattern, the TE with identical cut-off frequency and phase velocity is produced by mode conversion section 811And TM11Pattern, form
Mixed mode HE11.For the conical corrugated speaker antenna of Narrow Flare Angle, the near field of its Aperture Radiation can use the field in round speaker
Come approximate：
Solve corrugated waveguide collision matrix and substituted into the radiation side that above formula integration can obtain accurate corrugated horn
Xiang Tu.The surface reactance of corrugated waveguide wall is represented by following form：
WhereinFor waveguide radius,For the groove depth of corrugated horn,To end wave number,WithRespectively
The first kind and Bessel function of the second kind,WithFor its derivative.
Work as surface reactanceWhen, TE11And TM11The boundary condition of pattern is equivalent.Now, meet that corrugated waveguide transmits
Mixed mode HE11Condition, i.e.,：
Waveguide transmission HE can be obtained by solving above formula equation11The groove depth of pattern, Equation Approximate are.Ripple loudspeaker
In input and TE11Pattern match, groove depth are, in spoke side and HE11Pattern match, groove depth are, changeover portion
Groove depth fromIt is gradually transitions。
The structural parameters of circular waveguide corrugated horn are as follows：Centre frequency 97.5GHz, input radius 1.62mm, delivery outlet face
Radius 7.46mm, total length 45.8mm, change segment length 9.35mm, ripple groove width 0.24mm, corrugated periodic 0.435mm, groove depth
0.65~1.45mm.Circular waveguide corrugated horn structural model is as shown in Figure 3.The circular waveguide corrugated horn being calculated exists
Gain in working band reaches 19.8dB, and the first minor level is less than -8.5dB, corrugated horn antenna pattern and delivery outlet
Fig. 4 is shown in field distribution on face.
The focus of plano-convex face di-lens 2 overlaps with the phase center of circular waveguide corrugated horn 1, by lens carrier
It is fixed on platform.The illuminated area of plano-convex face di-lens is convex surface, and dark side is plane.Plano-convex face di-lens 2 will be sent out
Plane wave front is transformed into through illuminated area from the spheric wave front of circular waveguide corrugated horn, i.e. the shape of lens will cause outgoing
Field same phase, that is, all of each point penetrate footpath with equal from source point to the plane everywhere in the plane perpendicular to axle
Light path.The design principle of plano-convex face di-lens is as shown in Figure 5.It is required that penetrating footpath OPP ＇ and penetrating footpath OQQ ＇ Q ＂ has identical
Light path, due to PP ＇=Q ＇ Q ＂, that is, require OP=OQQ ＇.OQ=L is made, OP=R, is then had
WhereinFor free space wavelength,For lens medium wavelength,, n is medium refraction index, the present embodiment
Middle plano-convex face di-lens material is polytetrafluoroethylene (PTFE), medium refraction index 1.35.
Quasi- parabolic reflector 3 is smooth cylinder in the horizontal direction, is defined parabola in vertical direction, as shown in fig. 6,
Its profile equation is determined that rectangular coordinate system lower contour parametric equation is by aplanatism principle：
In formulaFor the caustic radius of incentive mode in coaxial resonant cavity,For coaxial resonant cavity axis to speculum summit
Distance.The focus of quasi- parabolic reflector is located on the caustic surface of coaxial resonant cavity.
The fixing device of quasi- parabolic reflector 3 is an adjustable support in direction, for adjusting Jiao of speculum
Point position.Because the caustic radius of different mode is different, therefore the position of caustic surface is also different.Needs pair when encouraging different mode
The support travel direction regulation of fixed quasi- parabolic reflector so that the focus of quasi- parabolic reflector is located at caustic surface
On.
Coaxial resonant cavity is made up of inner wire 5 and outer conductor 6.Coaxial resonant cavity is divided into three sections：End section 10, uniform segment 11
With transition 12.In uniform segment, coaxial resonant cavity passes on left blind flange closing.The structure of coaxial resonant cavity such as Fig. 7 and 8
It is shown.Couple electromagnetic energy array hole 13 in the side wall of outer conductor 6 is made up of 7 × 9 circular ports, wherein 7 be circumferencial direction hole
The line number of array, 9 be the line number of waveguide axial direction hole array, and the edge in hole uses rounded corners PROCESS FOR TREATMENT, and the radius in hole is
0.5mm, 15 ° of the angular spacing in hole, the axial spacing 1.2mm in hole.
In the present embodiment, the processing of quasi- parabolic reflector, coaxial resonant cavity and circular waveguide corrugated horn is equal
Using oxygenless copper material, the surfaces externally and internally of wherein circular waveguide corrugated horn uses craft of gilding processing to reduce loss.
Obviously, embodiments described above is only part of the embodiment of the present utility model, rather than whole implementation
Example.The scope of protection of the utility model should not be only limited to above-mentioned concrete structure or part or design parameter.
Although the utility model is described in detail with reference to the foregoing embodiments, one of ordinary skill in the art should
Work as understanding：It can still modify to the technical scheme described in foregoing embodiments, either to which part or complete
Portion's technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality
New claim limited range.
Claims (10)
- A kind of 1. millimeter wave multi-frequency multi-mode mode excitation device, it is characterised in that：Including：One circular waveguide corrugated horn, for producing HE11Pattern；One plano-convex face di-lens, for by HE11Mode conversion is TEM00Pattern；One quasi- parabolic reflector, for by incidence TEM00Focus of the electromagnetic wave convergence of pattern to quasi- parabolic cylinder；The coaxial resonant cavity of one side-wall hole, for producing the higher order mode of circular polarisation, and suppress other parasitic modes；Circular waveguide corrugated horn is conllinear with plano-convex face di-lens, and the focus of quasi- parabolic reflector is positioned at coaxial humorous Shake on the caustic surface of chamber, coaxial resonant cavity is horizontal positioned, and its axis is vertical with the axis antarafacial of circular waveguide corrugated horn.
- 2. millimeter wave multi-frequency multi-mode mode excitation device according to claim 1, it is characterised in that：Described circular waveguide ripple Line electromagnetic horn includes circular waveguide input section, mode conversion section and conical gradual change corrugated radiation section, the input of corrugated horn Circular waveguide TE11Pattern, TE is produced by mode conversion section11And TM11Mixed mode HE11, conical gradual change section is for suppressing miscellaneous Mould, and produce wide band electromagnetic radiation.
- 3. millimeter wave multi-frequency multi-mode mode excitation device according to claim 1, it is characterised in that：Plano-convex face medium is saturating Mirror material is polytetrafluoroethylene (PTFE), and medium refraction index 1.35, the illuminated area of lens is convex surface, and dark side is plane；Jiao of lens Point overlaps with the phase center of corrugated horn.
- 4. millimeter wave multi-frequency multi-mode mode excitation device according to claim 1, it is characterised in that：Quasi- parabolic dish Mirror is defined parabola in vertical direction, is in the horizontal direction smooth cylinder, its profile equation is determined by aplanatism principle.
- 5. millimeter wave multi-frequency multi-mode mode excitation device according to claim 1, it is characterised in that：Side-wall hole it is coaxial Resonator uses three stage structure：End section, uniform segment and deferent segment；The waveguide that cut-off section is reduced using radius makes mode of operation Cut-off, deferent segment form radiant output using the waveguide of radius increase, and middle uniform segment is the main part of coaxial resonant cavity.
- 6. millimeter wave multi-frequency multi-mode mode excitation device according to claim 5, it is characterised in that：Described coaxial resonance Chamber is made up of inner wire and outer conductor, and inner and outer conductor the radius pattern of excitation and working frequency needed for determine jointly, coaxially Resonator passes on left blind flange closing, and outer conductor is fixed on platform by Troffer.
- 7. millimeter wave multi-frequency multi-mode mode excitation device according to claim 6, it is characterised in that：Coaxial resonant cavity is led outside Couple electromagnetic energy structure on body sidewall is made up of m × n circular port, and wherein m is the line number of circumferencial direction hole array, and n is The line number of waveguide axial direction hole array, the radius in hole are 0.5mm, 15 ° of the angular spacing in hole, the axial spacing 1.2mm in hole.
- 8. the millimeter wave multi-frequency multi-mode mode excitation device according to claim any one of 1-7, it is characterised in that：Pattern swashs The operating frequency range for encouraging device is 90 ~ 180GHz, is worked using single-frequency, the corresponding incentive mode of each frequency.
- 9. millimeter wave multi-frequency multi-mode mode excitation device according to claim 8, it is characterised in that：Mode excitation device Operating frequency range is divided into following frequency range：90-105GHz, 105-120GHz, 120-135GHz, 135-150GHz, 150-165GHz, 165-180GHz；The circular waveguide corrugated horn of each corresponding respective bandwidth of working frequency range.
- 10. the millimeter wave multi-frequency multi-mode mode excitation device according to claim any one of 1-7, it is characterised in that：It is described Circular waveguide corrugated horn, quasi- parabolic reflector, coaxial resonant cavity be prepared by one of following material：Anaerobic Copper, aluminium or brass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621232425.6U CN207165721U (en) | 2016-11-17 | 2016-11-17 | A kind of millimeter wave multi-frequency multi-mode mode excitation device |
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|---|---|---|---|
| CN201621232425.6U CN207165721U (en) | 2016-11-17 | 2016-11-17 | A kind of millimeter wave multi-frequency multi-mode mode excitation device |
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| CN207165721U true CN207165721U (en) | 2018-03-30 |
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| CN201621232425.6U Expired - Fee Related CN207165721U (en) | 2016-11-17 | 2016-11-17 | A kind of millimeter wave multi-frequency multi-mode mode excitation device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505280A (en) * | 2016-11-17 | 2017-03-15 | 山东省科学院海洋仪器仪表研究所 | A kind of millimeter wave multi-frequency multi-mode mode excitation device |
| CN109004321A (en) * | 2018-06-27 | 2018-12-14 | 安徽华东光电技术研究所有限公司 | A kind of quasi-optics submillimeter wave isolator based on Medium Wave Guide |
-
2016
- 2016-11-17 CN CN201621232425.6U patent/CN207165721U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505280A (en) * | 2016-11-17 | 2017-03-15 | 山东省科学院海洋仪器仪表研究所 | A kind of millimeter wave multi-frequency multi-mode mode excitation device |
| CN109004321A (en) * | 2018-06-27 | 2018-12-14 | 安徽华东光电技术研究所有限公司 | A kind of quasi-optics submillimeter wave isolator based on Medium Wave Guide |
| CN109004321B (en) * | 2018-06-27 | 2021-07-09 | 安徽华东光电技术研究所有限公司 | Quasi-optical submillimeter wave isolator based on dielectric waveguide |
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Granted publication date: 20180330 Termination date: 20191117 |