CN103996893A - Low-order whispering gallery mode waveguide radiator - Google Patents

Abstract

The invention discloses a low-order whispering gallery mode waveguide radiator. The low-order whispering gallery mode waveguide radiator is sequentially composed of three parts of an input cylinder, a micro-disturbance structure and a spiral notch structure from the input end to the output end, the three parts are cylinders with the same outer wall radius, the inner walls of the three parts are continuous, and the three parts are coaxial. Efficient energy conversion from low-order whispering gallery mode microwaves to fundamental mode Gaussian wave beams can be achieved, harmful energy disturbance of reflection, diffraction and the like is reduced, and then a low-order whispering gallery mode quasi-optical mode converter is made to be more compact in structure, higher in energy conversion efficiency and working power, and longer in working time.

Description

A kind of low order side corner mould waveguide radiator

Technical field

The present invention relates to millimeter wave antenna technical field, especially a kind ofly specifically refer to a kind of waveguide radiator that low order side corner mould is converted to gaussian model.

Background technology

In ITER, HIGH RESOLUTION MMW and communicate by letter, under the application such as material processed promotes, utilize the cyclotron maser class device of electron cyclotron resonance master unsteadiness (ECRM) work to high power, high-frequency future development, its mode of operation starts to adopt low-loss high-order cavity modes gradually, and the mode of operation that typical case adopts conventionally has angle symmetric mode (TE _{0, m}, TM _{0, m}) and side corner mould (Whispering Gallery Mode) (TE (m>1) _m,n, TM _m,n(m>1, n>=1).But there is serious diffraction and polarization loss in multikilowatt, MW class high-order cavity modes that these cyclotron oscillation device resonant cavitys or amplifier interaction chamber produce in output region transmitting procedure, have a strong impact on stability, power capacity and the energy conversion efficiency of device work, these higher order modes must be carried out to depression of order processing.

Depression of order device conventional in circular waveguide has waveguide mode transducer and waveguide radiator.Adopt traditional waveguide mode transducer not only in restriction spurious mode, to design very difficult, and generally bulky, processing difficulties, to such an extent as to can not in the engineering practice of cyclotron maser device, use completely.As the waveguide radiator compact conformation of quasi-optical mode converter core component, can directly high-order cavity modes be efficiently converted to basic mode Gaussian beam, can effectively solve this technical barrier.Adopt the waveguide radiator can also be by electron beam and microwave separation simultaneously, facilitate cyclotron maser device step-down collector design, further to improve high-power millimeter-wave systems efficiency (Thumm, M. " State-of-the-Art of High Power Gyro-devices and Free Electron Masers; 1994. " Forschungszentrum Karlsruhe FZKA 5564, Germany, 1995; See also updated versions, FZKA 5728,1996 and FZKA6060,1998).

The waveguide radiator of having developed both at home and abroad is at present mainly (as TE for angle symmetric pattern _0,3) Vlasov radiator and high-order side corner mould (TE _m,n, TM _m,n(m>>1, n>>1) (the do 1MW 170GHz gyrotron of ITER development of typical case as Russian Applied Physics is operated in TE _25,10pattern) Denisov radiator.These two kinds of waveguide radiators are operated in low order side corner pattern (as TE _6,2) time, the fringing field field intensity of radiation wall is high, easily punctures, and incision diffraction and reflection is simultaneously large, causes power conversion efficiency low (being less than 90%) (Niu Xinjian etc., 94GhzTE _6,2the built-in quasi-Optical Mode Converter of mould, infrared and millimeter wave journal, the 30th the 5th phase of volume, in November, 211, p429).

Therefore need to design a kind of compact waveguide radiator that works in low order side corner mould, realize the high efficiency conversion of low order side corner pattern to basic mode Gaussian beam, to promote the development of low order side corner mould device.

Summary of the invention

The object of the invention is on the basis of above-mentioned prior art, a kind of low order side corner mould waveguide radiator is provided, this waveguide radiator can be realized low order side corner mould (as TE _6,2) change to the high efficiency of basic mode Gaussian beam, and compact conformation.

A kind of low order side corner mould waveguide radiator is made up of input cylinder, perturbed structure, helical cuts structure three parts successively from input to output; Described three parts are the cylinder that exterior radius is identical, and the inwall of three parts is continuous, and three part concentrics.

Further preferential, the radius of described perturbed structure is:

$R(\mathrm{\φ},z)=R\left(z\right)+\mathrm{\αz}+\underset{h=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{\δ}}_h\cos (l_h\mathrm{\φ}+\mathrm{\Δ}{\mathrm{\β}}_{h}z)$

Wherein:

△β ₁＝k _zm,n-k _zm±1,n,l ₁＝±1

△β ₂＝k _zm,n-k _{zm±△m,nm△n},l ₂＝±△m

Z be perturbed structure along axial length z>0, R (z) is perturbed structure input cylinder inside radius, K _{zm, n}tE _m,n, TM _m,nthe longitudinal wave number of pattern, α is waveguide subtended angle α>=0 °;

L ₁get just corresponding to input TE _m,n, TM _m,npattern is right-hand polarization, gets negative corresponding to input TE _m,n, TM _m,npattern is left-handed polarization;

△m＝π/θ,θ＝arcos(m/x _m,n)；

δ _hfor the amplitude of perturbation, x _m,nfor n zero point of m rank bessel functional derivative.

Further preferential, described perturbed structure inside radius is along the axial-periodic formation of arranging.

Further preferential, the inwall of described helical cuts structure is the continuity of perturbed structure inwall, and the helical cuts structure cycle helical cuts that is standard.

Further preferential, described input cylinder, perturbed structure, helical cuts structure are conductive metallic material and make.

The present invention also provides a kind of low order side corner mould waveguide radiator, from input to output, is made up of successively input cylinder, perturbed structure, helical cuts structure three parts; Described three ratio of components parts play helical cuts structure exterior radius from input cylinder and become continuously large, are trapezoidal conical structure, and the inwall of three parts is continuous, all round symmetrical structure and concentric.

In the present invention, in the radiator export structure of higher modes, the geometric optics wave beam that is used in back reflective on waveguide inwall replaces all wave surfaces in waveguide.As shown in Figure 2, parallel, equally distributed ray in input waveguide radiator, it distributes and meets (TE _m,n, TM _m,nmode profile) repeatedly after small sample perturbations, there is clustering through radiator perturbed structure, then according to the shortizationest and the minimized principle of incision electric current of radiator length, obtain the helical cuts of radiator.

Waveguide radiator structure of the present invention and operation principle are: by perturbed structure, the low order side corner pattern of inputting in waveguide radiator is converted to the mixed mode with different mode composition.In equal transmission range, because the axial wave number of these patterns is unequal, these patterns can produce certain phase shift; Select appropriate transmission range, after these patterns are superposeed mutually, be accurate Gaussian Profile state at the wall electric current of radiator inwall regional area, then according to radiator length the shortizationest (compact conformation) and the minimized principle of incision electric current, by this place's wall galvanic areas excision, obtain the helical cuts structure of radiator with helix.

In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows:

The present invention can realize low order side corner modes microwave and change to basic mode Gaussian beam energy efficient rate, reduce reflection and harmful energy perturbation such as diffraction, with promote the quasi-optical mode converter of low order side corner mould to more compact structure, more high-energy conversion efficiency, more high workload power, more farm labourer makes Time evolution; And then promote low order side corner mould cyclotron maser device to more compact structure, more high-energy conversion efficiency, more high workload power, more farm labourer makes Time evolution; Promote China in ITER, HIGH RESOLUTION MMW and communicate by letter, the progress in the high-power Millimeter Wave Applications field such as material processed.

Brief description of the drawings

Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:

Fig. 1 is the structure cross-sectional schematic of low order side corner mould waveguide radiator;

Fig. 2 is low order side corner mould waveguide radiator longitudinal sectional drawing schematic diagram;

Fig. 3 is TE _6,2radiator perturbed structure schematic diagram;

Fig. 4 is that radiator launches wave guide wall CURRENT DISTRIBUTION;

Wherein: the 1st, input cylinder, the 2nd, perturbed structure, the 3rd, helical cuts structure.

Embodiment

Disclosed all features in this specification, or step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.

As shown in Figure 1, a kind of low order side corner mould waveguide radiator of the present invention, is made up of input cylinder, perturbed structure, three parts of helical cuts structure, and three parts are the good metallic conductor structure of conductivity, generally adopt the metal that the conductivity such as oxygen-free copper are strong.Three construction packages that part is continuous one, the outer wall of three parts is the cylinder that radius is identical; Or become continuously large trapezoidal conical structure to the exterior radius of helical cuts structure again to perturbed structure from input cylinder, and the round symmetrical structure concentric of three parts.

According to above-mentioned operation principle, this facility example has designed an operating frequency 96GHz, the TE of input circular waveguide radius 6.4mm _6,2mode waveguide radiator.Radiator perturbed structure parameter δ _hwith the relation of perturbation section axis z as shown in Figure 3.Consider that coupling between 525 TE patterns and 525 TM patterns obtains perturbation section wave guide wall electric current with the distribution of angle phase place and Propagation distance as shown in Figure 4, according to radiator length the shortizationest and the minimized principle of incision electric current, obtain the helical cuts position of radiator, as shown in the black broken line in Fig. 4.Helical cuts place current amplitude with respect to electric current convergence center low-16.3dB.Perturbed structure section 34mm, helical cuts segment length 18mm.The radiation field waist radius obtaining is 4.05mm, and Gauss's content exceedes 93%, and energy conversion efficiency is 96.51%.

By the present invention, can develop low order side corner mould waveguide radiator, while being operated in low order side corner pattern to solve the Vlasov radiator of angle symmetric pattern and high-order side corner mould Denisov radiator, notching edge field field intensity is large, and diffraction loss is high, the difficult problem that conversion efficiency is not high.

The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.

Claims (10)

1. a low order side corner mould waveguide radiator, is characterized by from input to output and is made up of input cylinder, perturbed structure, helical cuts structure three parts successively; Described three parts are the cylinder that exterior radius is identical, and the inwall of three parts is continuous, and three part concentrics.

2. a kind of low order side corner mould waveguide radiator according to claim 1, the inside radius that it is characterized by described perturbed structure is:

$R(\mathrm{\φ},z)=R\left(z\right)+\mathrm{\αz}+\underset{h=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{\δ}}_h\cos (l_h\mathrm{\φ}+\mathrm{\Δ}{\mathrm{\β}}_{h}z)$

Wherein:

△β ₁＝k _zm,n-k _zm±1,n,l ₁＝±1

△β ₂＝k _zm,n-k _{zm±△m,nm△n},l ₂＝±△m

Z be perturbed structure along axial length z>0, R (z) is perturbed structure input cylinder inside radius, K _{zm, n}tE _m,n, TM _m,nthe longitudinal wave number of pattern, α is waveguide subtended angle α>=0 °;

L ₁get just corresponding to input TE _m,n, TM _m,npattern is right-hand polarization, gets negative corresponding to input TE _m,n, TM _m,npattern is left-handed polarization;

△m＝π/θ,θ＝arcos(m/x _m,n)；

δ _hfor the amplitude of perturbation, x _m,nfor n zero point of m rank bessel functional derivative.

3. a kind of low order side corner mould waveguide radiator according to claim 2, is characterized by described perturbed structure inside radius along the axial-periodic formation of arranging.

4. according to a kind of low order side corner mould waveguide radiator described in claim 1 or 3, the inwall that it is characterized by described helical cuts structure is the continuity of perturbed structure inwall, and the helical cuts structure cycle helical cuts that is standard.

5. a kind of low order side corner mould waveguide radiator according to claim 1, is characterized by described input cylinder, perturbed structure, helical cuts structure and is conductive metallic material and makes.

6. a low order side corner mould waveguide radiator, is characterized by from input to output and is made up of input cylinder, perturbed structure, helical cuts structure three parts successively; Described three ratio of components parts play helical cuts structure exterior radius from input cylinder and become continuously large, are trapezoidal conical structure, and the inwall of three parts is continuous, all round symmetrical structure and concentric.

7. a kind of low order side corner mould waveguide radiator according to claim 6, the inside radius that it is characterized by described perturbed structure is:

$R(\mathrm{\φ},z)=R\left(z\right)+\mathrm{\αz}+\underset{h=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{\δ}}_h\cos (l_h\mathrm{\φ}+\mathrm{\Δ}{\mathrm{\β}}_{h}z)$

Wherein:

△β ₁＝k _zm,n-k _zm±1,n,l ₁＝±1

△β ₂＝k _zm,n-k _{zm±△m,nm△n},l ₂＝±△m

Z be perturbed structure along axial length z>0, R (z) is perturbed structure input cylinder inside radius, K _{zm, n}tE _m,n, TM _m,nthe longitudinal wave number of pattern, α is waveguide subtended angle α>=0 °;

L ₁get just corresponding to input TE _m,n, TM _m,npattern is right-hand polarization, gets negative corresponding to input TE _m,n, TM _m,npattern is left-handed polarization;

△m＝π/θ,θ＝arcos(m/x _m,n)；

δ _hfor the amplitude of perturbation, x _m,nfor n zero point of m rank bessel functional derivative.

8. a kind of low order side corner mould waveguide radiator according to claim 7, is characterized by described perturbed structure inside radius along the axial-periodic formation of arranging.

9. according to a kind of low order side corner mould waveguide radiator described in claim 6 or 8, the inwall that it is characterized by described helical cuts structure is the continuity of perturbed structure inwall, and the helical cuts structure cycle helical cuts that is standard.

10. a kind of low order side corner mould waveguide radiator according to claim 6, is characterized by described input cylinder, perturbed structure, helical cuts structure and is conductive metallic material and makes.