CN101414699A - Novel microwave rotary joint - Google Patents
Novel microwave rotary joint Download PDFInfo
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- CN101414699A CN101414699A CNA2008102324993A CN200810232499A CN101414699A CN 101414699 A CN101414699 A CN 101414699A CN A2008102324993 A CNA2008102324993 A CN A2008102324993A CN 200810232499 A CN200810232499 A CN 200810232499A CN 101414699 A CN101414699 A CN 101414699A
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Abstract
The invention relates to a novel microwave rotary joint which comprises two wave guide coaxial converters, and both of the wave guide coaxial converters comprise a rectangular wave guide and coaxial structure, and the coaxial structure is arranged on a broad side axis line of the rectangular wave guide; the coaxial structure of the two wave guide coaxial converters has the same coaxial line and both of the wave guide coaxial converters are rotated around the coaxial line; the coaxial line is matched with impedances of the two rectangular wave guides; the coaxial line comprises a coaxial inner conductor and two coaxial outer conductors; a support medium is arranged between the coaxial outer conductors and the coaxial inner conductor; a ridge wave guide is arranged in the rectangular wave guide of the wave guide coaxial converter one; one end of the coaxial inner conductor is extended into a rectangular wave guide cavity one and is fixed on the ridge wave guide; the ridge wave guide and the rectangular wave guide one are transformed and transmitted through a multi-stage ladder; the other end of the coaxial inner conductor is extended into a rectangular wave guide cavity two and is not contacted with the wave guide wall; the other end of the coaxial inner conductor is provided with a matched end head; and a buckling position of the two coaxial outer conductors is provided with a choke groove. The novel microwave rotary joint has broad bandwidth and good and stable performance, and is suitable for every frequency band from L to Ka.
Description
Technical field
The present invention relates to the microwave component technical field, especially relate to a kind of novel microwave rotary joint.
Background technology
Along with developing rapidly of microwave technology, application band is progressively extended to high band more by L, S, C frequency range, and at present, the application of Ka frequency range more and more widely.Ka frequency range parts have the advantages that size is little, required precision is high, and existing rotary joint scheme and version thereof can not meet the demands.Specifically, existing rotary joint can be divided into two kinds: a kind of is to make rotating part with coaxial line, and the coaxial inner conductor two ends all link to each other with wave guide wall, on the coaxial inner and outer conductor all design choke groove arranged, the two is divided into two parts at the choke groove place to realize rotation; Another kind be with circular waveguide as rotating part, two ends are mapped structures of circular waveguide and rectangular waveguide, on the circular waveguide wall design choke groove is arranged, at the choke groove place divided into two parts realize the rotation.The weak point of above-mentioned two kinds of rotary joints is: preceding a kind of scheme is owing to all there is choke groove on coaxial inner and outer conductor, therefore, only be applicable to the low-frequency range parts, for the Ka frequency range is inapplicable, this is because in Ka frequency range rotary joint, the coaxial inner conductor diameter is little, and processing choke groove in the conductor is to be difficult to realize.A kind of scheme in back adopts circular waveguide as rotating part, then must utilize higher mode TM01 mould in the circular waveguide as transmission mode, and the shortcoming of this scheme is that frequency band is narrow.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned deficiency of the prior art, a kind of novel microwave rotary joint is provided, its bandwidth, performance is good and stable work in work, is fit to each frequency range of L～Ka, can be widely used in the antenna system that needs to follow the tracks of, aim at.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of novel microwave rotary joint, comprise 2 two waveguide coaxial converters of waveguide coaxial converter one and waveguide coaxial converter, described two waveguide coaxial converters include rectangular waveguide and are installed in coaxial configuration on the described rectangular waveguide broadside axis, the coaxial configuration of described two waveguide coaxial converters is that same coaxial line and the two are rotated around coaxial line, and the impedance of the rectangular waveguide of coaxial line and described two waveguide coaxial converters is all mated; Coaxial line comprise coaxial inner conductor and be sleeved on the coaxial inner conductor outside and be interlocked two coaxial outer conductors, be provided with Supporting Media between described two coaxial outer conductors and the coaxial inner conductor, the rectangular waveguide cavity of described two coaxial outer conductors and described two waveguide coaxial converters connects as one, it is characterized in that: be provided with ridge waveguide in the rectangular waveguide one of described waveguide coaxial converter one, coaxial inner conductor one end stretches in the square wave guide cavity one of described rectangular waveguide one and is fixed on the ridge waveguide, carries out transition by multistage step conversion between ridge waveguide and the described rectangular waveguide one; The other end of described coaxial inner conductor stretches in the square wave guide cavity two of waveguide coaxial converter two and with the wave guide wall of square wave guide cavity two and does not contact, and the other end of coaxial inner conductor is provided with the coupling termination of the rectangular waveguide two that is used for matched waveguide coaxial converter two and the impedance of coaxial line; The fastening place of described two coaxial outer conductors is provided with choke groove.
Described waveguide coaxial converter one is realized the impedance matching of coaxial line and described rectangular waveguide one by the size of adjusting ridge waveguide and multistage step conversion, wherein, the characteristic impedance value of coaxial line and described rectangular waveguide one is approaching more, realizes that the frequency band range of coaxial line and one impedance matching of described rectangular waveguide is wide more; Size and the waveguide short wall position of described rectangular waveguide two impedance matching that realize coaxial line and described rectangular waveguide two of described waveguide coaxial converter two by changing the coupling termination.
Described ridge waveguide is identical or close with the characteristic impedance value of coaxial line, and described waveguide coaxial converter one is realized the impedance matching of coaxial line and described rectangular waveguide one by the size of adjusting multistage step conversion.
Described multistage step conversion adopts the form of Chebyshev's 1/4 wavelength impedance transformer to carry out step conversion.
Described coaxial inner conductor is that tin bronze rod and its diameter are greater than 1.5mm.
Described choke groove is arranged on the side near waveguide coaxial converter two.
Distance between the waveguide short wall of described coaxial line and described rectangular waveguide one and described rectangular waveguide two is
Described choke groove is rotational symmetry structure and its by being arranged on a tooth on the coaxial outer conductor and the corresponding groove that is arranged on another coaxial outer conductor is formed, and the length of described tooth is identical with the degree of depth of groove and be
The thickness of tooth less than
The width of groove is 3 times of transverse tooth thickness degree, and the gap between tooth and the groove is
Wherein λ is the wavelength of the operation wavelength of waveguide coaxial converter one and waveguide coaxial converter two and this operation wavelength center frequency point correspondence when being work.
Described Supporting Media is the cylinder ring set of being made up of the semicircle band of column of two polytetrafluoroethylene systems, the external diameter of described cylinder ring set is identical with the internal diameter of described coaxial outer conductor, the diameter b of the coaxial inner conductor at described Supporting Media suit place ' less than the diameter b of coaxial inner conductor other parts and
Wherein, ε
rBe the dielectric constant of polytetrafluoroethylmaterial material, the internal diameter of described cylinder ring set is b '.
The length of described Supporting Media is 3～5mm.
Be provided with between the rectangular waveguide cavity outside of described two waveguide coaxial converters and realize the two bearing around the coaxial line rotation, described bearing is coaxial with coaxial line.
The present invention compared with prior art has the following advantages: 1, bandwidth can be applicable to each frequency range of L～Ka; 2, novel structure and reasonable, constitute by two multi-form waveguide coaxial converters, one of them waveguide coaxial converter adopts is that coaxial inner conductor directly is fixed on form on the rectangular waveguide wall, the transition of coaxial configuration elder generation is the ridge waveguide form, be rectangular waveguide by multistage step conversion transition again, realize impedance matching by the size of adjusting ridge waveguide size and multistage step conversion; What another waveguide coaxial converter adopted is the form that coaxial inner conductor is separated with the rectangular waveguide wall, coaxial inner conductor is directly stretched in the square wave guide cavity, but do not connect with wave guide wall, realize impedance matching by the size of change coaxial inner conductor and the position of waveguide short wall, coaxial inner conductor one end of finally having realized two waveguide coaxial converters is fixed, the unfixed version of an end, both guaranteed the stability in the rotation process, save the choke groove on the coaxial inner conductor again, guaranteed the realizability of the rotary joint of operating frequency more than 20GHz; 3, functional and stable work in work: the relative bandwidth standing internal wave 11% is less than 1.2; Insertion Loss is less than 0.2dB in 11% relative bandwidth; Rotate arbitrarily angled after, its standing wave change less than 0.1 and Insertion Loss change less than 0.1dB; Have good consistency, adopt the microwave rotary joint that processing scheme processed of product among the present invention to need not just can obtain top described performance through any debugging; 4, the transition of the coaxial configuration of one of them waveguide coaxial converter and rectangular waveguide realizes by ridge waveguide and multistage step conversion, ridge waveguide is identical or close with the characteristic impedance value of coaxial configuration, multistage step conversion adopts the form of Chebyshev's 1/4 wavelength impedance transformer, makes this waveguide coaxial converter have the advantage of bandwidth; 5, the rapidoprint of coaxial inner conductor is selected the tin bronze rod for use, and it has the intensity height, on-deformable advantage.In a word, the present invention has bandwidth, advantage that performance is good and stable, is fit to each frequency range of L～Ka, can be widely used in the antenna system that needs to follow the tracks of, aim at, and has market application foreground widely.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Description of reference numerals:
1-waveguide coaxial converter one; 2-waveguide coaxial converter two; 3-coaxial line;
4-ridge waveguide; 5-square wave guide cavity one; 6-multistage step conversion;
7-coupling termination; 8-coaxial inner conductor; 9-Supporting Media;
10-choke groove; 11-tooth; 12-groove;
13-bearing; 14-coaxial outer conductor one; 15-coaxial outer conductor two;
16-gland; 17-end ring; 18-nut;
19-screw; 23-square wave guide cavity two.
Embodiment
As shown in Figure 1, the present invention includes 22 two waveguide coaxial converters of waveguide coaxial converter 1 and waveguide coaxial converter, described two waveguide coaxial converters include rectangular waveguide and are installed in coaxial configuration on the described rectangular waveguide broadside axis, the coaxial configuration of described two waveguide coaxial converters is that same coaxial line 3 and the two are rotated around coaxial line 3, and coaxial line 3 all mates with the impedance of the rectangular waveguide of described two waveguide coaxial converters.That is to say that the central axis of described coaxial line 3 is positioned on the central axis of described rectangular waveguide one broadside and described rectangular waveguide two broadsides.Wherein, coaxial line 3 comprise coaxial inner conductor 8 and be sleeved on coaxial inner conductor 8 outsides and be interlocked two coaxial outer conductors, be provided with Supporting Media 9 between described two coaxial outer conductors and the coaxial inner conductor 8, promptly being positioned at the coaxial outer conductor 1 in coaxial inner conductor 8 outsides and the rectangular waveguide cavity of coaxial outer conductor 2 15 described two coaxial outer conductors and described two waveguide coaxial converters connects as one, in the present embodiment, the rectangular waveguide cavity of described two coaxial outer conductors and described two waveguide coaxial converters is made as one.Realize the two bearing 13 around coaxial line 3 rotations and be provided with between the rectangular waveguide cavity outside of described two waveguide coaxial converters, described bearing 13 is coaxial with coaxial line 3.In the present embodiment, the quantity of described bearing 13 is two, and two bearings 13 are sleeved between the outside of the outside of described rectangular waveguide cavity one and rectangular waveguide cavity two side by side, and is provided with end ring 17 in each bearing 13 1 side.In the present embodiment, the distance between the waveguide short wall of described coaxial line 3 and described rectangular waveguide one and described rectangular waveguide two is
Wherein, λ is the wavelength of the operation wavelength of waveguide coaxial converter 1 and waveguide coaxial converter 22 and this operation wavelength center frequency point correspondence when being work.In addition, bearing 13 arranged outside have the gland 16 and the gland 16 of encapsulation usefulness to be fixed on the described rectangular waveguide cavity one by screw 19.
Be provided with ridge waveguide 4 in the rectangular waveguide one of described waveguide coaxial converter 1, coaxial inner conductor 8 one ends stretch in the square wave guide cavity 1 of described rectangular waveguide one and are fixed on the ridge waveguide 4, carry out transition by multistage step conversion 6 between ridge waveguide 4 and the described rectangular waveguide one.Coaxial line 3 is positioned on the central axis of described rectangular waveguide one broadside, and waveguide short wall one side of the described rectangular waveguide one of coaxial line 3 distances
Wherein, described rectangular waveguide one common selection standard waveguide, for example: BJ120, BJ220, BJ260 etc., it is fixed that concrete model will be come by working band.In the present embodiment, coaxial inner conductor 8 one ends are fixed on the ridge waveguide 4 by nut 18, that is to say, coaxial inner conductor 8 one ends are fixed on the wave guide wall of square wave guide cavity 1.In addition, described waveguide coaxial converter 1 is realized the impedance matching of coaxial line 3 and described rectangular waveguide one by the size of adjusting ridge waveguide 4 and multistage step conversion 6, wherein, coaxial line 3 is approaching more with the characteristic impedance value of described rectangular waveguide one, realizes that coaxial line 3 is wide more with the frequency band range of described rectangular waveguide one impedance matching.In the present embodiment, described ridge waveguide 4 is identical or close with the characteristic impedance value of coaxial line 3, and described waveguide coaxial converter 1 is realized the impedance matching of coaxial line 3 and described rectangular waveguide one by the size of adjusting multistage step conversion 6.
In summary it can be seen that the size of coaxial line 3 will be considered two aspect factors: the one, the size of bearing 13, the 2nd, the intensity of coaxial inner conductor 8.In the practice, the specification of bearing is divided into several, in case but specification is selected, and its size is certain, therefore, will guarantee when the size of coaxial line 3 is selected for use that this structure can pass bearing 13; On the other hand, for the consideration of coaxial inner conductor Final 8 degree, because the diameter of coaxial inner conductor 8 is unsuitable too small, in the present embodiment, described coaxial inner conductor 8 be that excellent and its diameter of tin bronze is greater than 1.5mm.So, under the prerequisite that satisfies above-mentioned two restrictions, guarantee as far as possible that coaxial line 3 is approaching with the characteristic impedance value of described rectangular waveguide one, be convenient in the frequency band of broad, realize impedance matching.That is to say that in the practice, coaxial line 3 is approaching more with the characteristic impedance value of described rectangular waveguide one, realize that coaxial line 3 is wide more with the frequency band range of described rectangular waveguide one impedance matching.
In the actual processing and making process, to being calculated as follows of the characteristic impedance value of coaxial line 3 and described rectangular waveguide one:
Wherein, the characteristic impedance value computing formula of coaxial line 3 is as follows:
Wherein, μ
r, ε
rBe respectively the relative permeability and the relative dielectric constant of filling between coaxial inner conductor 8 and described coaxial outer conductor, for air dielectric, the two is 1; B is the diameter of coaxial inner conductor 8, and a is the internal diameter of described coaxial outer conductor.
And the characteristic impedance value computing formula of described rectangular waveguide one is as follows:
Wherein, n is the Narrow Wall of Waveguide limit, and m is the waveguide broadside, and λ is the wavelength of the operation wavelength of waveguide coaxial converter 1 and this operation wavelength center frequency point correspondence when being work.
Described rectangular waveguide one links to each other with coaxial line 3 after being transited into ridge waveguide 4 by multistage step conversion 6 again, and the central axis of coaxial line 3 is positioned on the central axis of described rectangular waveguide one broadside, and waveguide short wall one side of the described rectangular waveguide one of distance
λ is the wavelength of the operation wavelength of waveguide coaxial converter 1 and this operation wavelength center frequency point correspondence when being work.
In the present embodiment, the characteristic impedance value of ridge waveguide 4 equals or near the characteristic impedance value of coaxial line 3.Wherein, the computing formula of the characteristic impedance value of ridge waveguide 4 is complicated, it is organized into form in some books about the microwave transmission line theory, can directly consult.
And realize the multistage step conversion 6 of described rectangular waveguide one and ridge waveguide 4 impedance matchings, what adopt is that the form of Chebyshev's 1/4 wavelength impedance transformer is carried out step conversion, the size of the sum of series ladders at different levels of its ladder is mainly designed by following 4 steps by the characteristic impedance value and the voltage standing wave ratio decision of bandwidth of operation, ridge waveguide 4 and described rectangular waveguide one:
The first step, obtain following parameter according to designing requirement:
W
q: the expression relative bandwidth, computing formula is
Wherein, λ
1And λ
2The operation wavelength of representing working band lower side frequency and upper side frequency respectively;
R: the ratio of the characteristic impedance value of expression ridge waveguide 4 and described rectangular waveguide one;
ρ: the expression standing wave ratio of input voltage, get 1.01～1.05 usually;
Second goes on foot, determines the progression n of multistage step conversion 6, and computing formula is as follows:
Calculate after above each parameter, with reference to " structure of modern microwave filter and design " volume two, the science version, the Table I 1.2-5 in the 10th page has listed in this table
W
qWith the relation of n, then can obtain the value of n easily.
The characteristic impedance value of ladders at different levels in the 3rd step, the multistage step conversion 6 of calculating:
Consult " structure of modern microwave filter and design " volume two, the science version can be tried to achieve the characteristic impedance value of ladders at different levels in the multistage step conversion 6 easily, has listed step-characteristic impedances at different levels and n, W in this book
q, R relation.
The 4th step, the length of calculating ladders at different levels in the multistage step conversion 6 and height:
According to the theory of Chebyshev's 1/4 wavelength impedance transformer, the length of every grade of ladder is in the multistage step conversion 6
That is:
Wherein, λ
0The wavelength of expression center frequency point correspondence,
λ
1And λ
2The operation wavelength of representing working band lower side frequency and upper side frequency respectively;
Wherein, every grade of ladder all can be regarded one section rectangular waveguide as in the multistage step conversion 6, by front rectangular-waveguide property impedance computation formula as can be known, and promptly
Under the certain situation of waveguide broadside m, the characteristic impedance value of rectangular waveguide is directly proportional with duct height L, therefore, according to the characteristic impedance value of the ladders at different levels of trying to achieve above, can try to achieve the height of ladders at different levels in the multistage step conversion 6 easily.
More than provided the computational methods of the original dimension of waveguide coaxial converter 1, can set up the model of waveguide coaxial converter 1 according to this size, in its substitution Electromagnetic Simulation software (as HFSS), just can obtain its performance.Generally, this performance meets the demands substantially, in order further to improve performance, can carry out small adjustment on the basis of above-mentioned size; In addition, also increased a debugging method among the present invention, i.e. the size of the coaxial outer conductor 1 of coaxial line 3 ends, this place's size can suitably be adjusted according to simulation performance.
The other end of described coaxial inner conductor 8 stretches in the square wave guide cavity 2 23 of waveguide coaxial converter 22 and with the wave guide wall of square wave guide cavity 2 23 and does not contact, and the other end of coaxial inner conductor 8 is provided with the coupling termination 7 of the rectangular waveguide two that is used for matched waveguide coaxial converter 22 and the impedance of coaxial line 3.In addition, size and the waveguide short wall position of described rectangular waveguide two impedance matching that realize coaxial line 3 and described rectangular waveguide two of described waveguide coaxial converter 22 by changing coupling termination 7.Described rectangular waveguide two in the waveguide coaxial converter 22 is identical with waveguide coaxial converter 1 with the method for designing of coaxial line 3, repeats no more.Equally, the central axis of coaxial line 3 is positioned on the central axis of described rectangular waveguide two broadsides, waveguide short wall one side of the described rectangular waveguide two of distance
And coupling termination 7 is made up of a frustum of a cone and the cylinder that is arranged on the described frustum of a cone, omits inching by Electromagnetic Simulation software (as HFSS) and just can determine its size.
The fastening place of described two coaxial outer conductors is provided with choke groove 10, and described choke groove 10 is arranged on the side near waveguide coaxial converter 22, and in the actual processing and making process, choke groove 10 should be tried one's best near waveguide coaxial converter 221 sides.Described choke groove 10 is formed by being arranged on a tooth 11 and a corresponding groove 12 that is arranged on another coaxial outer conductor on the coaxial outer conductor for rotational symmetry structure and its.The degree of depth of the length of described tooth 11 and groove 12 is identical and be
The thickness of tooth 11 less than
To consider intensity and working ability simultaneously; The width of groove 12 is 3 times of tooth 11 thickness, and the gap between tooth 11 and the groove 12 is
Wherein λ is the wavelength of the operation wavelength of waveguide coaxial converter 1 and waveguide coaxial converter 22 and this operation wavelength center frequency point correspondence when being work.
In addition, described Supporting Media 9 is the cylinder ring set of being made up of the semicircle band of column of two polytetrafluoroethylene systems, the external diameter of described cylinder ring set is identical with the internal diameter of described coaxial outer conductor, the diameter b of the coaxial inner conductor 8 at described Supporting Media 9 suit places ' less than the diameter b of coaxial inner conductor 8 other parts and
Wherein, ε
rDielectric constant and ε for polytetrafluoroethylmaterial material
r=2.1, the internal diameter of described cylinder ring set is b '.Because dielectric support 9 can be introduced loss, therefore, the length of described Supporting Media 9 is 3～5mm.
At last, when the microwave rotary joint that processes through above-mentioned designing institute is tested, then correspondingly the switching waveguide is installed on described rectangular waveguide one and described rectangular waveguide two gets final product, and be connected by screw between described switching waveguide and rectangular waveguide one and the rectangular waveguide.
By above design, the main performance of designed microwave rotation link can reach:
(1) standing wave: the relative bandwidth standing internal wave 11% is less than 1.2;
(2) Insertion Loss: Insertion Loss is less than 0.2dB in 11% relative bandwidth;
(3) stability: this microwave rotary joint rotates arbitrarily angled, and standing wave changes less than 0.1, and Insertion Loss changes less than 0.1dB.
(4) consistency: the microwave rotary joint that is processed need not to debug, and just can obtain top described performance.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection range of technical solution of the present invention according to the technology of the present invention essence.
Claims (10)
1. novel microwave rotary joint, comprise two (2) two waveguide coaxial converters of waveguide coaxial converter one (1) and waveguide coaxial converter, described two waveguide coaxial converters include rectangular waveguide and are installed in coaxial configuration on the described rectangular waveguide broadside axis, the coaxial configuration of described two waveguide coaxial converters is that same coaxial line (3) and the two are rotated around coaxial line (3), and coaxial line (3) all mates with the impedance of the rectangular waveguide of described two waveguide coaxial converters; Coaxial line (3) comprise coaxial inner conductor (8) and be sleeved on coaxial inner conductor (8) outside and be interlocked two coaxial outer conductors, be provided with Supporting Media (9) between described two coaxial outer conductors and the coaxial inner conductor (8), the rectangular waveguide cavity of described two coaxial outer conductors and described two waveguide coaxial converters connects as one, it is characterized in that: be provided with ridge waveguide (4) in the rectangular waveguide one of described waveguide coaxial converter one (1), coaxial inner conductor (8) one ends stretch in the square wave guide cavity one (5) of described rectangular waveguide one and are fixed on the ridge waveguide (4), carry out transition by multistage step conversion (6) between ridge waveguide (4) and the described rectangular waveguide one; The other end of described coaxial inner conductor (8) stretches in the square wave guide cavity two (23) of waveguide coaxial converter two (2) and with the wave guide wall of square wave guide cavity two (23) and does not contact, and the other end of coaxial inner conductor (8) is provided with the coupling termination (7) of the rectangular waveguide two that is used for matched waveguide coaxial converter two (2) and the impedance of coaxial line (3); The fastening place of described two coaxial outer conductors is provided with choke groove (10).
2. according to the described a kind of novel microwave rotary joint of claim 1, it is characterized in that: described waveguide coaxial converter one (1) is realized the impedance matching of coaxial line (3) and described rectangular waveguide one by the size of adjusting ridge waveguide (4) and multistage step conversion (6), wherein, coaxial line (3) is approaching more with the characteristic impedance value of described rectangular waveguide one, realizes that coaxial line (3) is wide more with the frequency band range of described rectangular waveguide one impedance matching; Size and the waveguide short wall position of described rectangular waveguide two impedance matching that realize coaxial line (3) and described rectangular waveguide two of described waveguide coaxial converter two (2) by changing coupling termination (7).
3. according to the described a kind of novel microwave rotary joint of claim 2, it is characterized in that: described ridge waveguide (4) is identical or close with the characteristic impedance value of coaxial line (3), and described waveguide coaxial converter one (1) is realized the impedance matching of coaxial line (3) and described rectangular waveguide one by the size of adjusting multistage step conversion (6).
4. according to the described a kind of novel microwave rotary joint of claim 3, it is characterized in that: described multistage step conversion (6) adopts the form of Chebyshev's 1/4 wavelength impedance transformer to carry out step conversion.
5. according to the described a kind of novel microwave rotary joint of each claim in the claim 1 to 4, it is characterized in that: described coaxial inner conductor (8) for tin bronze rod and its diameter greater than 1.5mm.
6. according to the described a kind of novel microwave rotary joint of each claim in the claim 1 to 4, it is characterized in that: described choke groove (10) is arranged on the side near waveguide coaxial converter two (2).
7. according to the described a kind of novel microwave rotary joint of claim 4, it is characterized in that: the distance between the waveguide short wall of described coaxial line (3) and described rectangular waveguide one and described rectangular waveguide two is
Described choke groove (10) is formed by being arranged on a tooth (11) and the groove (12) that is arranged on another coaxial outer conductor of correspondence on the coaxial outer conductor for rotational symmetry structure and its, and the degree of depth of the length of described tooth (11) and groove (12) is identical and be
The thickness of tooth (11) less than
The width of groove (12) is 3 times of tooth (11) thickness, and the gap between tooth (11) and the groove (12) is
Wherein λ is the wavelength of the operation wavelength of waveguide coaxial converter one (1) and waveguide coaxial converter two (2) and this operation wavelength center frequency point correspondence when being work.
8. according to the described a kind of novel microwave rotary joint of each claim in the claim 1 to 4, it is characterized in that: the cylinder ring set of described Supporting Media (9) for forming by the semicircle band of column of two polytetrafluoroethylene systems, the external diameter of described cylinder ring set is identical with the internal diameter of described coaxial outer conductor, the diameter b of the coaxial inner conductor (8) at described Supporting Media (9) suit place ' less than the diameter b of coaxial inner conductor (8) other parts and
Wherein, ε
rBe the dielectric constant of polytetrafluoroethylmaterial material, the internal diameter of described cylinder ring set is b '.
9. according to the described a kind of novel microwave rotary joint of each claim in the claim 1 to 4, it is characterized in that: the length of described Supporting Media (9) is 3～5mm.
10. according to the described a kind of novel microwave rotary joint of each claim in the claim 1 to 4, it is characterized in that: be provided with between the rectangular waveguide cavity outside of described two waveguide coaxial converters and realize the two bearing (13) around coaxial line (3) rotation, described bearing (13) is coaxial with coaxial line (3).
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| US2812503A (en) * | 1953-11-25 | 1957-11-05 | Microwave Dev Lab | Waveguide rotary joint |
| US4020431A (en) * | 1976-01-15 | 1977-04-26 | Rockwell International Corporation | Multiaxis rotary joint for guided em waves |
| US4298850A (en) * | 1980-04-21 | 1981-11-03 | Microwave Antenna Systems And Technology Inc. | Double ridge waveguide rotary joint |
| RU2260229C1 (en) * | 2004-05-12 | 2005-09-10 | Федеральное государственное унитарное предприятие "Государственный московский завод "Салют" | Revolving joint |
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