CN102780060B - Porous rectangular waveguide directional coupler with different size - Google Patents
Porous rectangular waveguide directional coupler with different size Download PDFInfo
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- CN102780060B CN102780060B CN201210282741.4A CN201210282741A CN102780060B CN 102780060 B CN102780060 B CN 102780060B CN 201210282741 A CN201210282741 A CN 201210282741A CN 102780060 B CN102780060 B CN 102780060B
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Abstract
The invention discloses a porous rectangular waveguide directional coupler with a different size, which comprises a main rectangular waveguide, an auxiliary rectangular waveguide and coupling holes. The main rectangular waveguide is isolated from the auxiliary rectangular waveguide; the main rectangular waveguide is communicated with the auxiliary rectangular waveguide by at least three coupling holes; each coupling hole comprises a hollow coupling tube attached to the side wall of the main rectangular waveguide or/and the side of the auxiliary rectangular waveguide; the side wall of each hollow coupling tube, which is close to the main rectangular waveguide, is connected with a coupling cavity with three open ends; the coupling cavity is conducted with the hollow coupling tubes; the coupling cavity is positioned between the main rectangular waveguide and the auxiliary rectangular waveguide and is conducted with the main rectangular waveguide and the auxiliary rectangular waveguide; and the adjacent coupling holes are sequentially distributed at the left side and the right side of the axis of the main rectangular waveguide along the axis direction of the main rectangular waveguide. The porous rectangular waveguide directional coupler has the advantages of compact structure, is simple to process, has high power capacity and low insertion loss; and compared with a common porous directional coupler, the porous rectangular waveguide directional coupler has the outstanding advantage on the aspect of low insertion loss particularly in the millimeter wave and Terahertz wave bands.
Description
Technical field
The present invention relates to multi-hole directional coupler, specifically, relate to the porous rectangular waveguide directional coupler that a kind of size of utilizing multiple holes to be coupled is different.
Background technology
Directional coupler is widely used a kind of microwave device in microwave system, and its Main Function is that microwave signal is carried out to power division according to a certain percentage; Directional coupler is made up of two transmission lines, and coaxial line, rectangular waveguide, circular waveguide, strip line and microstrip line etc. all can form directional coupler; So of a great variety from structure directional coupler, widely different, but be mainly divided into four kinds from their coupling mechanism, i.e. aperture coupling, parallel coupling, branch's coupling and coupling double T.
Before early 1950s, nearly all microwave equipment all adopts metal waveguide and waveguide circuit, and directional coupler at that time mostly also is Waveguide Hole coupling directional coupler; Its theoretical foundation is Bethe slot-coupling theory, and the people such as Cohn and Levy have also done a lot of contributions.
Along with the development of aerospace technology, require microwave circuit and system to accomplish miniaturization, lightweight and dependable performance, so there is strip line and microstrip line, because the microwave integrated transmission-lines such as fin line, the line of rabbet joint, co-planar waveguide and coplanar stripline have appearred again in the needs of microwave circuit and system in succession, various transmission line directional couplers are so just there are subsequently.
Tradition single-hole directional coupler has some advantage: as simple in structure, parameter is few, design is got up more convenient; But it also exists some shortcomings: as poor in narrow bandwidth, directivity, only suitable in the work of design frequency place, drift out this frequency, and directivity will reduce.
Although tradition multi-hole directional coupler can accomplish that very wide bandwidth, directivity also have very and improve, but also exist some shortcomings, as large in volume, requirement on machining accuracy is high, insertion loss is high, particularly at millimeter wave terahertz wave band, too high Insertion Loss makes this device lose use value.This just encourages us to remove to design a kind of novel porous directional coupler that can overcome these shortcomings.
Summary of the invention
The object of the invention is to overcome some shortcomings of traditional directional coupler, a kind of compact, porous rectangular waveguide directional coupler that insertion loss size low, broadband is different are provided.
To achieve these goals, the technical solution used in the present invention is as follows: the porous rectangular waveguide directional coupler that size is different, is characterized in that: comprise as the main rectangular waveguide of microwave main channel with as the secondary rectangular waveguide of sampled signal passage and as the coupling aperture of coupling channel; The main mould H face of the main mould H face of main rectangular waveguide and secondary rectangular waveguide is parallel to each other, and main rectangular waveguide and secondary rectangular waveguide are isolated mutually; Main rectangular waveguide is communicated with secondary rectangular waveguide by least 3 coupling apertures, coupling aperture comprise be attached to main rectangular waveguide sidewall or and the hollow tube coupling of secondary rectangular waveguide sidewall, hollow tube coupling is connected with the coupling cavity of three end openings near the sidewall of main rectangular waveguide, coupling cavity and the conducting of hollow tube coupling, coupling cavity between main rectangular waveguide and secondary rectangular waveguide and with main rectangular waveguide and secondary rectangular waveguide conducting; Coupling aperture is arranged along the axis of main rectangular waveguide, is interspersed successively in left side and the right side of main rectangular waveguide axis along the adjacent coupling aperture of main rectangular waveguide axis direction; Along on main rectangular waveguide axis direction, the hole of adjacent two coupling apertures in the heart apart from the guide wavelength in the central task frequency of main rectangular waveguide 15% ~ 35% between;
The size Expressing of main rectangular waveguide is: a1*h1, and the size Expressing of secondary rectangular waveguide is: a2*h2, a1, a2 are expressed as the width of main rectangular waveguide and secondary rectangular waveguide, and h1, h2 are expressed as the height of main rectangular waveguide and secondary rectangular waveguide;
The size situation of the size of main rectangular waveguide and secondary rectangular waveguide is as follows:
Situation A: in the time that the size of main rectangular waveguide is less than the size of secondary rectangular waveguide,
H2*10% < h1 < h2*80% or and a2*10% < a1 < a2*80%;
Situation B: in the time that the size of main rectangular waveguide is greater than the size of secondary rectangular waveguide,
H1*10% < h2 < h1*80% or and a1*10% < a2 < a1*80%;
Situation C: when the size of main rectangular waveguide equals the size of secondary rectangular waveguide,
A1=a2 and h1=h2.
When the above-mentioned three kinds of different situations of selection of dimension of main rectangular waveguide and secondary rectangular waveguide, can obtain three kinds of different results.In the past people be all the rectangular waveguide of preferential choice criteria as the transmission channel of guide directional coupler, but in the time selecting situation A or situation B, at millimere-wave band and terahertz wave band, we can obtain filter with low insertion loss, the better directional coupler of directivity.Namely this extra degree of freedom can help us to design the better multi-hole directional coupler of directivity.
The projection of shape that coupling aperture is overlooked in direction at it is circle or polygon.
In described coupling aperture, added another axis cylindrical metal body vertical with the main mould H face of main rectangular waveguide, the only inwall connection with corresponding coupling aperture in a direction of this cylindrical metal body, the cross section of this cylindrical metal body be shaped as rectangle.
Described cylindrical metal body can all or part ofly be positioned at the inside of main rectangular waveguide.
The one or both ends of described main rectangular waveguide or secondary rectangular waveguide are also connected with curved waveguide.
Described main rectangular waveguide Huo and secondary rectangular waveguide are connected with the matching structure with extraneous device matching in its one or both ends.
The part of coupling aperture is beyond main rectangular waveguide or secondary rectangular waveguide, or the while is outside main rectangular waveguide and secondary rectangular waveguide.
The axis of described main rectangular waveguide and secondary rectangular waveguide is parallel to each other.
Single-hole directional coupler has relatively narrow bandwidth in directivity, so people have expected a series of coupling apertures of design, and an array of this series of coupling aperture composition, several arrays can also stack up, and come thus the comprehensive degree of coupling and directional responses.Utilize the directivity of aperture and the directivity of array to superpose in coupled end, just can obtain better directivity, and this extra degree of freedom can also improve bandwidth.Therefore, in order to increase the coupling performance of coupling aperture, we arrange coupling aperture along the axis of main rectangular waveguide, simultaneously in order to increase the bore of coupling aperture, and the left side that is distributed in main rectangular waveguide axis and right side that we interlock adjacent coupling aperture successively.
After coupling aperture is staggered, meeting under the condition of coupling reinforcement, be adjacent two coupling apertures hole in the heart apart from should be arranged on main rectangular waveguide central task frequency guide wavelength 15% ~ 35% between, we can increase the bore of coupling aperture, so can further add again close coupling, thereby further improve the directivity of this rectangular waveguide directional coupler.
Meanwhile, preferentially selecting cross section is that rectangle column metallic object is arranged in coupling aperture, and the position of cylindrical metal body in coupling aperture is unrestricted, can arrange according to the actual requirements.
Angle between the general axis of main rectangular waveguide and the axis of secondary rectangular waveguide is between 5 ° to 175 °.For the volume that makes its whole coupler reduces, we pay the utmost attention to the axis of main rectangular waveguide and the axis of secondary rectangular waveguide be arranged in parallel.
The projection of shape that coupling aperture is overlooked direction at it is unrestricted, and in the time considering cost of manufacture, we pay the utmost attention to circle or triangle or the quadrangle of the simple and easy batch production of energy.
While increasing cylindrical metal body, described coupling aperture is in-line or Y-shaped or cross and other starlike more than 4 branches in the projection of shape of overlooking direction.
Wherein above-mentioned H face is magnetic field face.
Based on said structure, the present invention compared to its improvement of multi-hole directional coupler is in the past: traditional coupling aperture is improved to the coupling channel being made up of coupling cavity and hollow tube coupling, wherein coupling cavity is arranged between main rectangular waveguide and secondary rectangular waveguide, hollow tube coupling be attached to main rectangular waveguide sidewall or and secondary rectangular waveguide sidewall.Can increase like this its directivity.
Owing to there being multiple coupling apertures, its multiple coupling apertures can make to reach between waveguide the effect of coupling reinforcement, simultaneously for the aperture that makes coupling aperture is strengthened, therefore the further improvement of the present invention is: coupling aperture is arranged along the axis of main rectangular waveguide, is interspersed successively in left side and the right side of main rectangular waveguide axis along the adjacent coupling aperture of main rectangular waveguide axis direction; Along on main rectangular waveguide axis direction, the hole of adjacent two coupling apertures in the heart apart from the guide wavelength in the central task frequency of main rectangular waveguide 15% ~ 35% between.The left side that is distributed in main rectangular waveguide axis and the right side that, adjacent coupling aperture are interlocked successively.After adjacent coupling aperture is interspersed, in unit are, because we adopt the both sides of the staggered main rectangular waveguide that coupling aperture is arranged, so certainly will be under the condition of identical hole count, we just can increase the bore of coupling aperture, so the reinforcement that can further be coupled again, thus the directivity of this porous rectangular waveguide directional coupler further improved.Because experiment is found, in the time that we adopt the main rectangular waveguide of ordinary construction and secondary rectangular waveguide to design, the directivity of common waveguiding structure is than the good directionality of standard waveguide structure, therefore, the main rectangular waveguide adopting in the present invention and secondary rectangular waveguide all do not adopt standard size or one to adopt standard size, one not adopt standard size aspect size, aspect size, adjust the directivity of increase coupler that can be extra.Therefore while design, preferentially arrange hollow tube coupling in coupling aperture be attached to main rectangular waveguide sidewall or and secondary rectangular waveguide sidewall.Further preferentially be set to: the size of main rectangular waveguide and secondary rectangular waveguide all adopts common size.
The operation principle of multi-hole directional coupler can be described below:
Because can being similar to, waveguide inwall regards ideal conducting plane as.According to the boundary condition of alternating electromagnetic field, ideal conducting plane E only has the component perpendicular with surface, there is no tangential component; Magnetic field H only has the component tangent with surface, there is no normal component.The public broadside of the vertical major-minor rectangular waveguide of main waveguide internal electric field, reaches that a part of electric field that complementary wave leads still perpendicular to the public broadside of major-minor waveguide by aperture, and its power line forms an elbow.The closed curve that magnetic field (magnetic line of force) is parallel main Guide of Wide Wall, pierces into therefore the magnetic field of main waveguide (magnetic line of force) forms one group at aperture place the full curve that passes secondary rectangular waveguide.
Entering by aperture that a part of electric field that complementary wave leads leads coupling aperture both sides at complementary wave and is coupled out electric field E vertically downward
'.The electric field E of alternation
'inspire Induced magnetic field H
'(direction is determined by S=E*H).Electricity, magnetic field alternately excite, and form the electromagnetic wave to coupled end and isolation end output respectively.
Entering by aperture that a part of magnetic field that complementary wave leads leads coupling aperture both sides at complementary wave and is coupled out level magnetic field H to the right
'.The magnetic field H of alternation
'inspire the electric field E inducting
'.Electricity, magnetic field alternately excite, and form the electromagnetic wave to coupled end and isolation end output respectively.
Aperture coupling is above-mentioned electric coupling and magnetic-coupled stack.The electromagnetic wave that two kinds of couplings are formed merges, and we can find out that the electromagnetic wave transmitting toward coupled end direction superposes in the same way, form coupling output; Electromagnetic wave toward the transmission of isolation end direction oppositely superposes, and the formation of cancelling out each other isolation end, so be to export without coupling in principle.But due to aperture electricity, magnetic-coupled asymmetry, both superpose and have produced directivity.
Multi-hole directional coupler utilizes an array of a series of coupling aperture composition exactly, and several arrays can also stack up, and come thus the comprehensive degree of coupling and directional responses.Utilize the directivity of aperture and the directivity of array to superpose in coupled end, just can obtain better directivity, and this extra degree of freedom can also improve bandwidth.
The invention has the advantages that compact conformation, processing is simple, power capacity is large, insertion loss is low, particularly at millimeter wave and terahertz wave band, compared with common multi-hole directional coupler, aspect filter with low insertion loss, has outstanding advantage.Compact multi-hole directional coupler of the present invention is expected to be widely used in the electronic system of each microwave band and terahertz wave band, particularly military affairs and the civil area such as radar, missile guidance, communication.
Brief description of the drawings
Fig. 1 is the axis of main rectangular waveguide and the stereogram of the axis of secondary rectangular waveguide when parallel in the present invention.
Fig. 2 is the structural perspective of coupling aperture.
Fig. 3 is the vertical view of the embodiment of the present invention one.
Fig. 4 be the hollow tube coupling that obtains according to embodiment one be attached to main rectangular waveguide sidewall or and the transmission curve of coupled end and isolation end when secondary rectangular waveguide sidewall.
Fig. 5 is the vertical view of the embodiment of the present invention two.
Fig. 6 is the A-A profile of the embodiment of the present invention two.
Fig. 7 is the vertical view of the embodiment of the present invention three.
Fig. 8 is the vertical view of the embodiment of the present invention four.
Fig. 9 is the vertical view of the embodiment of the present invention five.
Figure 10 is the vertical view of the embodiment of the present invention six.
Label in figure is expressed as: 1, main rectangular waveguide; 2, secondary rectangular waveguide; 3, coupling aperture; 31, coupling cavity; 32, hollow tube coupling; 4, cylindrical metal body; 5, curved waveguide.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiment of the present invention is not limited to this.
As shown in Figure 1, 2, the porous rectangular waveguide directional coupler that size is different, comprises as the main rectangular waveguide 1 of microwave main channel with as the secondary rectangular waveguide 2 of sampled signal passage and as the coupling aperture 3 of coupling channel; Main rectangular waveguide 1 and secondary rectangular waveguide 2 are isolated mutually; Coupling aperture 3 comprise be attached to main rectangular waveguide 1 sidewall or and the hollow tube coupling 32 of secondary rectangular waveguide sidewall, hollow tube coupling 32 is connected with the coupling cavity 31 of three end openings near the sidewall of rectangular waveguide 1, coupling cavity 31 and 32 conductings of hollow tube coupling, coupling cavity 31 between main rectangular waveguide 1 and secondary rectangular waveguide 2 and with main rectangular waveguide 1 and 2 conductings of secondary rectangular waveguide
.wherein, the number of coupling aperture 3 is 3; The projection of shape that coupling aperture 3 is overlooked direction at it is for circular, and the axis of the axis of main rectangular waveguide 1 and secondary rectangular waveguide 2 is parallel to each other.Coupling aperture 3 is arranged along the axis of main rectangular waveguide 1, is interspersed successively in left side and the right side of main rectangular waveguide 1 axis along the adjacent coupling aperture of main rectangular waveguide 1 axis direction; Along on main rectangular waveguide 1 axis direction, the hole of adjacent two coupling apertures 3 in the heart apart from the guide wavelength in the central task frequency of main rectangular waveguide 1 22% ~ 28% between.
Embodiment mono-
As shown in Figure 3, the porous rectangular waveguide directional coupler that size is different, comprises as the main rectangular waveguide 1 of microwave main channel with as the secondary rectangular waveguide 2 of sampled signal passage and as the coupling aperture 3 of coupling channel; Main rectangular waveguide 1 and secondary rectangular waveguide 2 are isolated mutually; Coupling aperture 3 comprise be attached to main rectangular waveguide 1 sidewall or and the hollow tube coupling 32 of secondary rectangular waveguide sidewall, hollow tube coupling 32 is connected with the coupling cavity 31 of three end openings near the sidewall of rectangular waveguide 1, coupling cavity 31 and 32 conductings of hollow tube coupling, coupling cavity 31 between main rectangular waveguide 1 and secondary rectangular waveguide 2 and with main rectangular waveguide 1 and 2 conductings of secondary rectangular waveguide
.wherein, there are the both sides of 6 coupling aperture 3 symmetric arrays at main rectangular waveguide 1; The projection of shape that coupling aperture 3 is overlooked direction at it is square, and the axis of the axis of main rectangular waveguide 1 and secondary rectangular waveguide 2 is parallel to each other.
As shown in Figure 4, the experimental data of gained Fig. 4 is the experimental data that in the present invention, the design according to Fig. 3 generates to specific experiment data, compares with existing multi-hole directional coupler, and except the position difference of coupling aperture, all the other conditions are all consistent; Fig. 4 be after improving hollow tube coupling be attached to main rectangular waveguide sidewall or and the transmission curve of coupled end and isolation end when secondary rectangular waveguide sidewall, the port S3.1 in Fig. 4 is coupled end, port S4.1 is isolation end.According to formula
, wherein I is isolation, C is the degree of coupling, D is directivity index, we can calculate in frequency is that the porous rectangular waveguide directional coupler that within the scope of the GHz of 6.5GHz ~ 10, this size is different is close coupling directional coupler, and its degree of coupling is 3+/-0.5dB, and good directionality is in-22dB.And there is no hollow tube coupling before improvement time, if realize the close coupling of 3dB left and right, need 10 pairs of above coupling apertures, and the length of coupler increases greatly, and its insertion loss also increases greatly simultaneously.
Before improving and after improving, compare, be from the difference of experiment condition: the hollow tube coupling improving in the present invention is attached to main rectangular waveguide sidewall and secondary rectangular waveguide sidewall, and only there is coupling aperture before improving, its coupling aperture coupling aperture is positioned at main rectangular waveguide and secondary rectangular waveguide along within the projection of coupling aperture axis direction along the projection of its axis direction.
As can be seen from above, the present invention design coupler on directional performance, be obviously better than improve before design.
Compared to its improvement of multi-hole directional coupler be in the past: 1, traditional coupling aperture is improved to the coupling channel being formed by coupling cavity and hollow tube coupling, wherein coupling cavity is arranged between main rectangular waveguide and secondary rectangular waveguide, hollow tube coupling be attached to main rectangular waveguide sidewall or and secondary rectangular waveguide sidewall; 2, the left side that is distributed in main rectangular waveguide axis and the right side that adjacent coupling aperture are interlocked successively.After adjacent coupling aperture is interspersed, we just can increase the bore of coupling aperture.Can increase like this its directivity.
Coupling aperture is arranged along the axis of main rectangular waveguide, is interspersed successively in left side and the right side of main rectangular waveguide axis along the adjacent coupling aperture of main rectangular waveguide axis direction; Along on main rectangular waveguide axis direction, the hole of adjacent two coupling apertures in the heart apart from the guide wavelength in the central task frequency of main rectangular waveguide 15% ~ 35% between.The left side that is distributed in main rectangular waveguide axis and the right side that, adjacent coupling aperture are interlocked successively.Because we adopt the both sides of the staggered main rectangular waveguide that coupling aperture is arranged, so certainly will be under the condition of identical hole count, we just can increase the bore of coupling aperture, so the reinforcement that can further be coupled again, thus the directivity of this square porous guide directional coupler further improved.
Wherein the size Expressing of main rectangular waveguide is: a1*h1, and the size Expressing of secondary rectangular waveguide is: a2*h2, a1, a2 are expressed as the width of main rectangular waveguide and secondary rectangular waveguide, and h1, h2 are expressed as the height of main rectangular waveguide and secondary rectangular waveguide; Meanwhile, compared to its improvement of multi-hole directional coupler be in the past: adopt standard rectangular waveguiding structure to be improved to tradition and adopt normal rectangular waveguide structure, the size situation of the size of main rectangular waveguide and secondary rectangular waveguide is as follows:
Situation A: in the time that the size of main rectangular waveguide is less than the size of secondary rectangular waveguide,
H2*10% < h1 < h2*80% or and a2*10% < a1 < a2*80%;
Situation B: in the time that the size of main rectangular waveguide is greater than the size of secondary rectangular waveguide,
H1*10% < h2 < h1*80% or and a1*10% < a2 < a1*80%;
Can further increase like this its directivity.
Embodiment bis-
As Fig. 5, shown in 6, the places different from embodiment mono-are that main rectangular waveguide 1 and secondary rectangular waveguide 2 are communicated with by 5 coupling apertures 3; The part of 5 coupling apertures 3 is beyond main rectangular waveguide 1 and secondary rectangular waveguide 2.The axis of described coupling aperture 3 is vertical with the axis of main rectangular waveguide 1, its cross section be shaped as irregular polygon, coupling aperture 3 is positioned at the both sides of main rectangular waveguide, along on main rectangular waveguide 1 axis direction, the hole of adjacent two coupling apertures in the heart apart from the guide wavelength in the central task frequency of main rectangular waveguide 1 22% ~ 28% between, be any one coupling aperture in adjacent two coupling apertures along the guide wavelength of main rectangular waveguide 1 axis direction Mobility Center operating frequency 22% ~ 28% after, can make the hole heart line of these two adjacent coupling apertures vertical with the axis of main rectangular waveguide, in each coupling aperture 3, add another axis cylindrical metal body 4 vertical with the axis of main rectangular waveguide 1, the cross section of this cylindrical metal body 4 be shaped as rectangle.
Embodiment tri-
As shown in Figure 7, the places different from embodiment bis-are, the two ends of secondary rectangular waveguide 2 are also connected with curved waveguide 5, can facilitate being like this connected of directional coupler and extraneous device, thereby it are better to obtain directivity, the guide directional coupler that bandwidth is wider.
Embodiment tetra-
As shown in Figure 8, the place different from embodiment two is that 5 coupling apertures 3 are interspersed in the both sides of main rectangular waveguide 1, and the cross section of coupling aperture 3 is oval, and in coupling aperture 3, does not all add column metallic object 4.
Embodiment five
As shown in Figure 9, the place different from embodiment four is that the cross section of coupling aperture 3 is rectangle, and in coupling aperture 3, is provided with the cylindrical metal body 4 that shape of cross section is rectangle.
Embodiment six
As shown in figure 10, different from embodiment four is that the cross section of coupling aperture 3 is triangle.
Just can realize preferably as mentioned above the present invention.
Claims (7)
1. the porous rectangular waveguide directional coupler that size is different, is characterized in that: comprise as the main rectangular waveguide (1) of microwave main channel with as the secondary rectangular waveguide (2) of sampled signal passage and as the coupling aperture (3) of coupling channel; The main mould H face of the main mould H face of main rectangular waveguide (1) and secondary rectangular waveguide (2) is parallel to each other, and main rectangular waveguide (1) and secondary rectangular waveguide (2) are isolated mutually; Main rectangular waveguide (1) is communicated with secondary rectangular waveguide (2) by least 3 coupling apertures (3), coupling aperture (3) comprise be attached to main rectangular waveguide (1) sidewall or and the hollow tube coupling (32) of secondary rectangular waveguide (2) sidewall, hollow tube coupling (32) is connected with the coupling cavity (31) of three end openings near the sidewall of main rectangular waveguide (1), coupling cavity (31) and hollow tube coupling (32) conducting, coupling cavity (31) be positioned between main rectangular waveguide (1) and secondary rectangular waveguide (2) and with main rectangular waveguide (1) and secondary rectangular waveguide (2) conducting; Coupling aperture (3) is arranged along the axis of main rectangular waveguide (1), is interspersed successively in left side and the right side of main rectangular waveguide (1) axis along the adjacent coupling aperture (3) of main rectangular waveguide (1) axis direction; Along on main rectangular waveguide (1) axis direction, the hole of adjacent two coupling apertures (3) in the heart apart from the guide wavelength in the central task frequency of main rectangular waveguide (1) 15% ~ 35% between
;
The size Expressing of main rectangular waveguide (1) is: a1*h1, the size Expressing of secondary rectangular waveguide (2) is: a2*h2, a1, a2 are expressed as the width of main rectangular waveguide (1) and secondary rectangular waveguide (2), and h1, h2 are expressed as the height of main rectangular waveguide (1) and secondary rectangular waveguide (2);
The size situation of the size of main rectangular waveguide (1) and secondary rectangular waveguide (2) is as follows:
Situation A: in the time that the size of main rectangular waveguide (1) is less than the size of secondary rectangular waveguide (2),
H2*10% < h1 < h2*80% or and a2*10% < a1 < a2*80%;
Situation B: in the time that the size of main rectangular waveguide (1) is greater than the size of secondary rectangular waveguide (2),
H1*10% < h2 < h1*80% or and a1*10% < a2 < a1*80%;
Situation C: when the size of main rectangular waveguide (1) equals the size of secondary rectangular waveguide (2),
A1=a2 and h1=h2.
2. the porous rectangular waveguide directional coupler that size according to claim 1 is different, is characterized in that: the projection of shape that coupling aperture (3) is overlooked in direction at it is circle or polygon.
3. the porous rectangular waveguide directional coupler that size according to claim 1 is different, it is characterized in that: in described coupling aperture (3), added another axis cylindrical metal body (4) vertical with the main mould H of main rectangular waveguide (1) face, the only inwall connection with corresponding coupling aperture (3) in a direction of this cylindrical metal body (4), the cross section of this cylindrical metal body (4) be shaped as polygon.
4. the porous rectangular waveguide directional coupler that size according to claim 3 is different, is characterized in that: all or part of inside that is positioned at main rectangular waveguide (1) of described cylindrical metal body (4).
5. the porous rectangular waveguide directional coupler that size according to claim 1 is different, is characterized in that: the axis of described main rectangular waveguide (1) and secondary rectangular waveguide (2) is parallel to each other.
6. the porous rectangular waveguide directional coupler different according to the size described in any one in claim 1-5, is characterized in that: described main rectangular waveguide (1) or and the one or both ends of secondary rectangular waveguide (2) be also connected with curved waveguide (5).
7. the porous rectangular waveguide directional coupler different according to the size described in any one in claim 1-5, is characterized in that: described main rectangular waveguide (1) Huo and secondary rectangular waveguide (2) are connected with the matching structure with extraneous device matching in its one or both ends.
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| CN202678493U (en) * | 2012-08-10 | 2013-01-16 | 成都赛纳赛德科技有限公司 | Size-variable multi-hole rectangular waveguide directional coupler |
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| CN202678493U (en) * | 2012-08-10 | 2013-01-16 | 成都赛纳赛德科技有限公司 | Size-variable multi-hole rectangular waveguide directional coupler |
Non-Patent Citations (3)
| Title |
|---|
| JP平4-150601A 1992.05.25 |
| 圆波导-矩形波导小孔耦合定向耦合器设计;曹乃胜 等;《强激光与粒子束》;20080430;第20卷(第4期);全文 * |
| 曹乃胜 等.圆波导-矩形波导小孔耦合定向耦合器设计.《强激光与粒子束》.2008,第20卷(第4期), |
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