CN102055047A - Ka frequency range high-power waveguide rotary joint - Google Patents
Ka frequency range high-power waveguide rotary joint Download PDFInfo
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- CN102055047A CN102055047A CN 200910210147 CN200910210147A CN102055047A CN 102055047 A CN102055047 A CN 102055047A CN 200910210147 CN200910210147 CN 200910210147 CN 200910210147 A CN200910210147 A CN 200910210147A CN 102055047 A CN102055047 A CN 102055047A
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- rotary joint
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- wave guide
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Abstract
The invention discloses a Ka frequency range high-power waveguide rotary joint consisting of an upper half and a lower half which are mutually connected and respectively connected by a T-shaped branch with an H surface and a TM01 mode conversion part; the TM01 mode conversion part comprises a rectangular straight waveguide and a round waveguide; the round waveguide is arranged at the center of the rectangular straight waveguide and is butted with the wide side of the rectangular straight waveguide which is in a symmetric form relative to the centre of the circle of the round waveguide; and two branches of the T-shaped branch with an H surface are connected with two ports of the rectangular straight waveguide. With a bilateral symmetric exciting TM01 mode method, a path of signals is decomposed into two paths of signals with equal width and same phase by the T-shaped branch with an H surface so that the correlation to a frequency is greatly lowered when a TE11 mode is inhibited, the high inhibition on the TE11 mode is realized within larger bandwidth, and the stability of the electrical property of the rotary joint in rotating is realized.
Description
Technical field
The invention belongs to the microwave communication field, relate to a kind of high-power rotary joint, particularly a kind of Ka frequency range large power waveguide rotary joint of bilateral symmetry excitation.
Background technology
In microwave communication, rotary joint is in order to the transmission in realization microwave signal between dynamic antenna system and static emission system and the receiving system, so its structural design will satisfy the structural requirement of antenna dynamic motion again when the As soon as possible Promising Policy electric property requires.
Rotary joint commonly used at present has the coaxial rotary joint of loaded medium and adopts the all-wave of monolateral excitation to lead TM01 mould rotary joint.Adopt the coaxial rotary joint of loaded medium,, therefore can cause bigger hear rate to produce, be unfavorable for high-power use on the star because the loss of medium is bigger.Adopt the all-wave of monolateral excitation to lead TM01 mould rotary joint, because monolateral excitation TM01 weighted-voltage D/A converter is to the inhibition right and wrong broadband of basic mode (TE11), it is big influenced by processing, particularly evident to the Ka frequency range, therefore can cause standing-wave ratio and the bigger cyclic fluctuation of insertion loss in bigger insertion loss and the rotation process.
In order to realize the stationarity of electrical property in low-loss and the rotation process, rotary joint is necessary for the all-wave guide structure and the TE11 mould is realized inhibition more than the 40dB in bandwidth of operation.The unit that has at present adopts the TM01 weighted-voltage D/A converter of symmetrical drive, as shown in Figure 1, can realize the inhibition to the TE11 mould in the bandwidth of broad.But this TM01 weighted-voltage D/A converter adopts the double slit symmetrical drive, because double slit is narrower, therefore the micro discharge surplus is little, be unfavorable for high-power use, and the influence of short circuit face during owing to the double slit excitation, make near the electric field the double slit local inhomogeneities occur, cause its Y direction that is suppressed to the TE11 mould to strengthen with frequency dependence, the inhibition bandwidth narrows down.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the prior art deficiency, a kind of high-power use, electrical property is steady, loss is little Ka frequency range large power waveguide rotary joint of helping is provided.
Technical solution of the present invention is: Ka frequency range large power waveguide rotary joint, be divided into interconnective the first half and the latter half, and its first half and the latter half are connected to form by a H face T-branch and a TM01 mould conversion portion respectively; TM01 mould conversion portion comprises a rectangle straight wave guide and a circular waveguide; Circular waveguide is positioned at the center of rectangle straight wave guide, docks with the broadside of rectangle straight wave guide, and the rectangle straight wave guide is symmetric form with respect to the center of circle of circular waveguide; Two branches of H face T-branch are connected with two ports of rectangle straight wave guide.
Two parts up and down of described rotary joint link to each other with bearing by choke groove.
Described choke groove is that the double flute of degree of depth λ/4 is formed, and wherein λ is the centre wavelength of rotary joint.
On the common port broadside of described H face T-branch a tuning screw is arranged, two forms that branch into the step transition that turns round, H face T-branch realizes coupling by the tuning screw and the step transition that turns round.
The width a=0.72 λ of described rectangle straight wave guide, wherein λ is the centre wavelength of rotary joint, thickness b=0.2a;
The selection of the radius r of described circular waveguide need be satisfied 2.61r＞λ＞2.06r, and wherein λ is the centre wavelength of rotary joint.
Described whole rotary joint is an all-metal construction.
Principle of the present invention is: the similar characteristics of longitudinal field electric field field pattern of TM01 mould in the transverse field that utilizes TE10 mould in the rectangular waveguide and the circular waveguide, TE10 mould in the rectangular waveguide is changed into TM01 mould in the circular waveguide, by suitable coupling, can obtain of the close coupling of rectangular waveguide TE10 mould to circular waveguide TM01 mould.The present invention is on the basis that has utilized this basic principle, in order further to obtain high TE11 mould inhibition degree, adopted the mode of bilateral symmetry excitation, make that the TE10 mould of two-way constant amplitude homophase encourages the TE11 mould constant amplitude of getting up anti-phase in the rectangular waveguide in circular waveguide, thereby realized the height of TE11 mould is suppressed, because the TM01 mould is a differential mode, so the TM01 mould that the TE10 mould of two-way constant amplitude homophase encourages in circular waveguide the rectangular waveguide is the constant amplitude homophase.The excitation of this bilateral symmetry has the inhibitory action identical with the TE11 mould to all in the circular waveguide with mould, but it is not inhibited to all differential modes, therefore, except that crossing rotary joint mode of operation TM01 mould, higher patterns such as all the other differential modes such as TE21 mould suppress by selecting suitable circular waveguide radius.
The present invention's advantage compared with prior art is:
(1) the present invention uses the method for bilateral symmetry excitation TM01 mould, adopt H face T-branch one tunnel signal decomposition to be become the signal of two-way constant amplitude homophase in this method, when suppressing the TE11 mould and frequency dependence reduce greatly, therefore in the bandwidth of broad, realized the height of TE11 mould is suppressed, realized the stationarity of rotary joint electrical property when rotating.
(2) the present invention has adopted the all-wave guide structure, does not have any medium and loads, and micro discharge has been done comprehensive consideration, therefore effectively reduces the insertion loss of rotary joint, helps high-power use.
(3) to suppress the method and the frequency dependence of TE11 mould low, only relevant with the symmetry of structure in the present invention, and the small asymmetry that mismachining tolerance causes is less to the inhibition influence of TE 11 moulds, can realize the inhibition higher to the TE11 mould in the bandwidth of broad.This specific character is to highly beneficial in the use of Ka frequency range.
(4) rotary joint overall dimensions size has been considered in the design of H face T-branch among the present invention, in the design transition is placed on two bifurcation rather than the common port of H face T-branch, effective like this saved rotary joint laterally and radial dimension, satisfied on the star harsh requirement to space and weight.If be not subjected to spatial limitation, transition also can be placed on the common port place of H face T-branch.
Description of drawings
Fig. 1 is the TM01 weighted-voltage D/A converter schematic diagram of the double slit symmetrical drive of background technology;
Fig. 2 is the side-looking schematic diagram of Ka frequency range large power waveguide rotary joint of the present invention;
Fig. 3 is the vertical view of the H face T-branch of Ka frequency range large power waveguide rotary joint of the present invention;
Fig. 4 is the TM01 mould conversion portion schematic diagram of Ka frequency range large power waveguide rotary joint of the present invention;
Fig. 5 is the choke groove cutaway view of Ka frequency range large power waveguide rotary joint of the present invention;
Fig. 6 is that the TE10 of Ka frequency range large power waveguide rotary joint of the present invention changes schematic diagram to the TM01 mould;
Fig. 7 is the TM01 mould conversion portion symmetry schematic diagram of Ka frequency range large power waveguide rotary joint of the present invention;
Fig. 8 be among the embodiment when the different anglecs of rotation standing-wave ratio curve;
Fig. 9 be among the embodiment when the different anglecs of rotation Insertion Loss curve;
Figure 10 for the TM01 mould conversion portion among the embodiment to the inhibition of basic mode TE11 and the TE21 mould line of writing music.
Embodiment
As shown in Figure 2, rotary joint of the present invention is divided into interconnective the first half and the latter half, and its first half and the latter half are connected to form by a H face T-branch 1 and a TM01 mould conversion portion 2 respectively; TM01 mould conversion portion 2 comprises a rectangle straight wave guide 20 and a circular waveguide 21, and as shown in Figure 4, circular waveguide 21 docks with the broadside of rectangle straight wave guide 20; As shown in Figure 7, in the vertical view of TM01 mould conversion portion 2, rectangle straight wave guide 20 is with respect to circular waveguide about 21, and is symmetrical up and down; Two branch port of H face T-branch 1 link to each other with two ports of rectangle straight wave guide 20 respectively.
Two parts up and down of rotary joint link to each other with bearing 4 by choke groove 3.
As shown in Figure 3, H face T-branch 1 also comprises a tuning screw 10 and two step transitions 11 that turn round.Have 10, two of tuning screws to branch into the form of the step transition 11 that turns round on the common port broadside of H face T-branch 1, H face T-branch 1 realizes coupling by the tuning screw 10 and the step transition 11 that turns round.
TM01 mould conversion portion 2 is as Fig. 4, in the present embodiment, and the width a=0.72 λ of rectangle straight wave guide 20, thickness b=0.2a.
It is silver-plated that the material of the H face T-branch of present embodiment, TM01 mould conversion portion 2, choke groove 3 and bearing 4 is aluminium.
Ka frequency range large power waveguide rotary joint adopts the mode of bilateral symmetry excitation to encourage the TM01 mould, realizes the effective inhibition to the TE11 mould simultaneously; H face T-branch 1 is divided into one road signal signal of two-way constant amplitude homophase, the signal of this two-way constant amplitude homophase is fed into the two ends of the rectangle straight wave guide 20 of TM01 mould conversion portion 2 respectively then, because the transverse field of the TE10 mould that the rectangle straight wave guide is 20 li and the TM01 mould longitudinal field electric field field pattern of 21 li of circular waveguides are similar, therefore use TM01 mould conversion portion 2 can convert the TE10 mould of 20 li of rectangle straight wave guides to the TM01 mould of 21 li of circular waveguides, after selecting suitable dimensions, can realize of the close coupling of the TE10 mould of rectangular waveguide 20, as Fig. 6 to the TM01 mould of circular waveguide 21.
Because TE 11 moulds that circular waveguide is 21 li belong to and mould, the TM01 mould belongs to differential mode, these two kinds of patterns have the difference of essence, the TE10 mould that the left and right both sides of TM01 mould rectangle straight wave guide shown in Figure 6 is 20 li all can be at 21 li excitations of circular waveguide get up TE11 mould and TM01 mould, but for the TE11 mould, the TE11 mold component amplitude that encourage on left and right both sides equates that direction is opposite, thereby balances out; For the TM01 mould, the TM01 mold component amplitude that encourage on left and right both sides equates, direction is identical, thereby coherent superposition, this specific character is needed just, by this bilateral symmetry excitation, can very effectively curb the TE11 mould, realize the close coupling of the TE10 of rectangle straight wave guide 20 to the TM01 mould of circular waveguide 21.
In the present embodiment, circular waveguide 21 in the TM01 mould conversion portion 2 is positioned at the center of rectangle straight wave guide 20 broadsides, rectangle straight wave guide 20 is symmetric form with respect to the center of circle of circular waveguide 21, as shown in Figure 7 (otherwise the TM01 conversion portion can decrease to the inhibition of TE11 mould).
The radius of circular waveguide 21 is selected to transmit the TM01 mould; again the TE21 mould is ended; and the selection of the radius of circular waveguide 21 can not make TM01 mould or TE21 mould be near near the cut-off state, otherwise TM01 mould loss is strengthened or makes the TE21 mould can not effective attenuation.
In the present embodiment, the radius r range of choice of circular waveguide 21 is: 2.61r＞λ＞2.06r, and this moment TE21 mould and other mode cutoff of high-order more, and can transmit the TM01 mould.When the TE21 mould is in cut-off state, can effective attenuation TE21 mould and other higher order modes by the length that increases circular waveguide.
Owing to effectively suppressed TE11 mould and TE21 mould and other higher order modes, 21 li transmission of circular waveguide be very pure TM01 mould because the field structure of TM01 mould is symmetrical for circle, this specific character can guarantee rotary joint electrical property height unanimity when rotated.
The effect of choke groove 3 is that two identical TM01 mould conversion portions are coupled together, and this connection has structural discontinuity, but is continuous on electric, as shown in Figure 5.Exactly because this structural discontinuity, the continuity on electric, rotary joint just can freely be rotated by bearing 4, but electrical property can not change.By above principle, can design the good rotary joint of electrical property.
By optimal design, the electrical property of present embodiment can reach:
Standing-wave ratio: in 8% bandwidth, reach below 1.15, as shown in Figure 8, be the standing-wave ratio curve of present embodiment 0 °, 45 °, 90 °, 135 ° and 180 ° five anglecs of rotation.
Insert loss: in 8% bandwidth, reach below the 0.15dB, as shown in Figure 9.
Inhibition degree to basic mode TE11 mould: reach more than the 40dB in 8% bandwidth.Reaching more to the TE21 mould, the higher mode of high-order suppresses: reach more than the 40dB in 8% bandwidth.As shown in figure 10.
The micro discharge surplus: during 1600W greater than 6dB.
Rotation rises and falls: standing-wave ratio rises and falls less than 0.03; Inserting loss rises and falls less than 0.02dB.
Overall dimension: 44.34 * 43.60 * 43.32mm
3
Under the situation that does not change its function, the equivalent transformation that carries out or alternative also falls into protection scope of the present invention to each building block of the present invention, position relation and connected mode.The undocumented technology of the present invention belongs to techniques well known.
Claims (7)
1.Ka frequency range large power waveguide rotary joint, it is characterized in that: described rotary joint is divided into interconnective the first half and the latter half, and its first half and the latter half are connected to form by a H face T-branch (1) and a TM01 mould conversion portion (2) respectively; TM01 mould conversion portion (2) comprises a rectangle straight wave guide (20) and a circular waveguide (21), circular waveguide (21) is positioned at the center of rectangle straight wave guide (20), dock with the broadside of rectangle straight wave guide (20), rectangle straight wave guide (20) is symmetric form with respect to the center of circle of circular waveguide (21); Two branches of H face T-branch (1) are connected with two ports of rectangle straight wave guide (20).
2. according to the Ka frequency range large power waveguide rotary joint of claim 1, it is characterized in that: the first half of described rotary joint links to each other with bearing (4) by choke groove (3) with the latter half.
3. according to the Ka frequency range large power waveguide rotary joint of claim 2, it is characterized in that: described choke groove (3) is formed for the double flute of degree of depth λ/4, and wherein λ is the centre wavelength of rotary joint.
4. according to the Ka frequency range large power waveguide rotary joint of claim 1 or 2, it is characterized in that: a tuning screw (10) is arranged on the common port broadside of described H face T-branch (1), two forms that branch into the step transition that turns round (11), H face T-branch (1) realizes coupling by tuning screw (10) and the step transition that turns round (11).
5. according to the Ka frequency range large power waveguide rotary joint of claim 1, it is characterized in that: the width a=0.72 λ of described rectangle straight wave guide (20), wherein λ is the centre wavelength of rotary joint, the thickness b=0.2a of rectangle straight wave guide (20).
6. according to the Ka frequency range large power waveguide rotary joint of claim 1, it is characterized in that: the range of choice of described circular waveguide (21) radius r is: 2.61r＞λ＞2.06r, wherein λ is the centre wavelength of rotary joint.
7. according to the Ka frequency range large power waveguide rotary joint of claim 1, it is characterized in that: described rotary joint is a metal structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910210147 CN102055047A (en) | 2009-10-29 | 2009-10-29 | Ka frequency range high-power waveguide rotary joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910210147 CN102055047A (en) | 2009-10-29 | 2009-10-29 | Ka frequency range high-power waveguide rotary joint |
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| CN102055047A true CN102055047A (en) | 2011-05-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326089A (en) * | 2013-07-02 | 2013-09-25 | 北京维创时通科技有限公司 | Ultra small waveguide rotary joint |
| CN104466306A (en) * | 2014-11-06 | 2015-03-25 | 北京遥测技术研究所 | Three-channel microwave rotary joint |
| CN112490607A (en) * | 2020-10-27 | 2021-03-12 | 西安空间无线电技术研究所 | Terahertz torsional waveguide based on diaphragm polarization converter and implementation method thereof |
| CN113948833A (en) * | 2021-09-30 | 2022-01-18 | 中国船舶重工集团公司第七二四研究所 | Non-contact broadband microwave rotary joint |
-
2009
- 2009-10-29 CN CN 200910210147 patent/CN102055047A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326089A (en) * | 2013-07-02 | 2013-09-25 | 北京维创时通科技有限公司 | Ultra small waveguide rotary joint |
| CN104466306A (en) * | 2014-11-06 | 2015-03-25 | 北京遥测技术研究所 | Three-channel microwave rotary joint |
| CN104466306B (en) * | 2014-11-06 | 2017-04-19 | 北京遥测技术研究所 | Three-channel microwave rotary joint |
| CN112490607A (en) * | 2020-10-27 | 2021-03-12 | 西安空间无线电技术研究所 | Terahertz torsional waveguide based on diaphragm polarization converter and implementation method thereof |
| CN113948833A (en) * | 2021-09-30 | 2022-01-18 | 中国船舶重工集团公司第七二四研究所 | Non-contact broadband microwave rotary joint |
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Application publication date: 20110511 |