CN105305001A - Terahertz rectangular waveguide bi-directional coupler - Google Patents
Terahertz rectangular waveguide bi-directional coupler Download PDFInfo
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- CN105305001A CN105305001A CN201510745987.4A CN201510745987A CN105305001A CN 105305001 A CN105305001 A CN 105305001A CN 201510745987 A CN201510745987 A CN 201510745987A CN 105305001 A CN105305001 A CN 105305001A
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Abstract
The invention discloses a terahertz rectangular waveguide bi-directional coupler, which comprises a straight waveguide substrate, a coupling plate and a coupling waveguide substrate, wherein the coupling plate is located between the straight waveguide substrate and the coupling waveguide substrate; a straight waveguide cavity is formed in the straight waveguide substrate; two coupling waveguide cavities which are in a symmetrical structure about the center of the coupling waveguide substrate are arranged on the coupling waveguide substrate; the coupling waveguide cavities are L-shaped; each coupling waveguide cavity is formed by vertical connection of a first cavity body and a second cavity body; the first cavity bodies of the two coupling waveguide cavities extend along the length direction of the straight waveguide cavity; the second cavity bodies of the two coupling waveguide cavities extend along a midperpendicular direction of the straight waveguide cavity; a coupling hole which is used for being communicated with the straight waveguide cavity and the first cavity bodies of the coupling waveguide cavities is formed in the coupling plate; and the straight waveguide substrate, the coupling plate and the coupling waveguide substrate are sequentially connected with one another. The terahertz rectangular waveguide bi-directional coupler is simple in structure and high in machining accuracy, can meet the requirements of a terahertz frequency band, and has the advantages of high coupling accuracy, low straight loss and the like.
Description
Technical field
The present invention relates to a kind of Terahertz rectangular waveguide dual directional coupler.
Background technology
Directional coupler is the requisite microwave components as Signal separator and power monitoring in microwave vector network analyzer and signal source.Generally lead directly to transmission channel (main road), coupling path (secondary road) and coupled structure by signal to form.Its operation principle be microwave signal from main input, fraction power enters secondary road by coupled structure, most of power continue through main road export.The signal entering secondary road exports other signal processing modules to, thus realizes separation and the monitoring of signal.As shown in Figure 1.Dual directional coupler is then on the main road of single directional coupler, superpose a road coupled structure and secondary road again, for realizing Signal separator during reverse transfer.In Terahertz frequency range, directional coupler generally adopts rectangular waveguide as main road and secondary road transmission channel, can be described as again straight-through waveguide cavity and coupled wave guide cavity, Space Coupling structure many employings Small aperture coupling mode.
As shown in Figure 2, prior art adopts symmetrical stacked system to be symmetrical arranged two groups of coupled structures and coupling path at main road, is convenient to shorten main road path-length, reduces loss.For realizing the program, dual directional coupler needs to adopt multilayer space overlapping structure, as shown in Figure 3 and Figure 4.Dual directional coupler scheme shown in Fig. 3 adopts five-layer structure, namely straight-through waveguide cavity 101 is positioned at intermediate layer, both sides arrange coupling piece 102 respectively, 103, coupled wave guide cavity 104, 105, the straight-through waveguide cavity 101 in intermediate layer is by two individual part 106, 107 are combined to form, owing to adopting pin location, pin needs through five layers of part, and form two individual part 106 of straight-through waveguide cavity 101, 107 need two groups of pin location, and due to pin location there is fit clearance, between each layer part, positional precision cannot meet the requirements of precision, also there is microwave from leakage between each layer simultaneously, performance index are caused not reach requirement.Dual directional coupler scheme shown in Fig. 4 adopts four-layer structure, namely adopts two groups of integrated coupling units 201,202 and cover plate 203,204 to realize the Spatial Coupling of each waveguide cavity.For integrated coupling unit 201, integrated coupling unit 201 is the waveguide cavity assemblies straight-through waveguide thorax chamber 205, coupled wave guide cavity 206 and coupling aperture 207 become one by machine work or forging type, and the straight-through waveguide thorax chamber 205 of integrated coupling unit 201 is combined to form straight-through waveguide cavity with the straight-through waveguide thorax chamber 208 of integrated coupling unit 202.Owing to have employed integrated morphology scheme, position error and the microwave leakage of each interlayer significantly reduce, but when frequency is elevated to more than 0.5THz, minimum coupling aperture is contracted to 0.1mm, adjacent coupled hole minimum wall thickness (MINI W.) 0.02mm, coupling aperture length 0.03mm, exceeded existing machine work and casting capacity limit, therefore, program crudy cannot reach necessary requirement.As can be seen here, prior art requires further improvement.
Summary of the invention
The object of the invention is to propose a kind of Terahertz rectangular waveguide dual directional coupler, to solve the poor problem of the indexs such as the coupling accuracy that in prior art, multilayer rectangle waveguide dual directional coupler causes because complex structure and existing machining accuracy are difficult to meet Terahertz band requirement, straight-through loss.
To achieve these goals, the present invention adopts following technical scheme:
A kind of Terahertz rectangular waveguide dual directional coupler, comprise straight-through waveguide substrate, coupling piece and coupled waveguide substrate, wherein, coupling piece is between straight-through waveguide substrate and coupled waveguide substrate; Straight-through waveguide substrate is provided with straight-through waveguide cavity; Coupled waveguide substrate is provided with two coupled wave guide cavities about coupled waveguide substrate center symmetrically structure; Described coupled wave guide cavity is L-shaped, and it connects to form by a cavity is vertical with No. two cavitys; A cavity of two coupled wave guide cavities all stretches along the length direction of straight-through waveguide cavity; No. two cavitys of two coupled wave guide cavities all stretch along the perpendicular bisector direction of straight-through waveguide cavity; Coupling piece is provided with the coupling aperture of a cavity for being communicated with straight-through waveguide cavity and coupled wave guide cavity; Straight-through waveguide substrate, coupling piece and coupled waveguide substrate connect successively.
Further, the length of straight-through waveguide cavity is a cavity length sum of two coupled wave guide cavities.
Further, the length of straight-through waveguide cavity is 1 to 1.5 times of coupled waveguide substrate upper flange plate diameter.
Tool of the present invention has the following advantages:
First, version of the present invention is identical with single directional coupler, be three layers structure, i.e. straight-through waveguide substrate, coupling piece and coupled waveguide substrate, for 0.5THz with super band, the advantage of this kind of structure is that coupling piece can adopt advanced technologies means independently to shape (as laser processing), is easy to the machining accuracy ensureing coupling aperture; Secondly, the minimum theoretical length of straight-through waveguide cavity will significantly reduce straight-through loss; 3rd, three layers structure of the present invention only comprises two contact-making surfaces, is conducive to microwave from leakage between lower layer; 4th, the present invention is relative to original five layers and four-layer structure scheme, and processing cost significantly reduces, and improves working (machining) efficiency.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of directional coupler in prior art;
Fig. 2 is the fundamental diagram of dual directional coupler in prior art;
Fig. 3 is the dual directional coupler structural representation in prior art with five-layer structure;
Fig. 4 is the dual directional coupler structural representation in prior art with four-layer structure;
Fig. 5 is the fundamental diagram of a kind of Terahertz rectangular waveguide dual directional coupler in the present invention;
Fig. 6 is the structural representation of a kind of Terahertz rectangular waveguide dual directional coupler in the present invention;
Fig. 7 is the schematic layout pattern of coupled wave guide cavity in the present invention;
Wherein, 101-leads directly to waveguide cavity, and 102,103-coupling piece, 104,105-coupled wave guide cavity, 106,107-individual part; 201, the integrated coupling unit of 202-, 203,204-cover plate, 205,208-leads directly to waveguide thorax chamber, 206-coupled wave guide cavity, 207-coupling aperture; 1-leads directly to waveguide substrate, 2-coupling piece, 3-coupled waveguide substrate, and 4-leads directly to waveguide cavity, and 5,6-coupled wave guide cavity, 7,9-cavity, 8,10-No. bis-cavitys, 11,12-coupling aperture, 13-absorbing load, 14-ring flange.
Embodiment
General principle of the present invention is: superpose the second road coupled wave guide cavity in the adjacent position of first via coupled wave guide cavity, forms coupled in series.Under normal circumstances, coupled in series structure can extend the transmission path of straight-through waveguide cavity, causes the aggravation of main road loss.The present invention is by reducing the measures such as wall thickness between the radius of curvature R of coupled wave guide cavity, adjacent coupled hole and absorbing load size, by the compresses in length extremely about ring flange diameter half of coupling branch road occupied by main road transmission direction, after superposing the second tunnel coupling branch road, two groups of coupled wave guide cavities are a ring flange diameter in the length of main road transmission direction substantially, therefore the length of straight-through waveguide cavity also should be ring flange diameter dimension mutually, this is also the theoretic minimum length size of straight-through waveguide cavity, as shown in Figure 5.
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
Shown in composition graphs 6, a kind of Terahertz rectangular waveguide dual directional coupler, comprises straight-through waveguide substrate 1, coupling piece 2 and coupled waveguide substrate 3, and wherein, coupling piece 2 is between straight-through waveguide substrate 1 and coupled waveguide substrate 3.
Straight-through waveguide substrate 1 is provided with straight-through waveguide cavity 4.
Coupled waveguide substrate 3 is provided with two coupled wave guide cavities 5,6 about coupled waveguide substrate 3 center symmetrically structure.
Coupled wave guide cavity 5 and 6 is all L-shaped.Wherein, coupled wave guide cavity 5 is vertically connected to form by a cavity 7 and No. two cavitys 8, and coupled wave guide cavity 6 is vertically connected to form by a cavity 9 and No. two cavitys 10.
A cavity 7 and a cavity 9 are all along main road direction, and namely the length direction of straight-through waveguide cavity 4 stretches.
No. two cavitys 8 and No. two cavitys 10 perpendicular bisector directions along straight-through waveguide cavity 4 are stretched.
Coupling piece 2 is provided with two groups of coupling apertures, is respectively coupling aperture 11 and coupling aperture 12.
Coupling aperture 11 for being communicated with a cavity 7 of straight-through waveguide cavity 4 and coupled wave guide cavity 5, coupling aperture 12 for being communicated with a cavity 9 of straight-through waveguide cavity 4 and coupled wave guide cavity 6, as shown in Figure 7.
Absorbing load 13 is equipped with at the cecum place of a cavity 7 and a cavity 9.
By reducing the measure such as wall thickness and absorbing load 13 size between the radius of curvature R of coupled wave guide cavity 5,6, adjacent coupled hole, make the compresses in length of each coupling branch road occupied by main road transmission direction extremely about ring flange diameter d 1 half, namely the length of a cavity 7 and a cavity 9 is ring flange 14 diameter half, coupled wave guide cavity 5 and 6 is a ring flange diameter in the length sum of main road transmission direction, therefore, the length d2 of straight-through waveguide cavity 1 also should be a ring flange diameter mutually.
By above-mentioned design, make to present invention achieves the dual directional coupler with the shortest straight-through waveguide cavity 4, main road transmission path is short, reduces main road and leads directly to loss.Certainly, straight-through waveguide cavity 4 length suitably can also strengthen according to band requirement, and its length range can be extended to 1 to 1.5 times of coupled waveguide substrate ring flange 14 size.
Straight-through waveguide substrate 1, coupling piece 2 and coupled waveguide substrate 3 connect successively, form three layers structure, and its connected mode comprises screw fastening or welding, bonding mode is fixed.Dual directional coupler of the present invention is applicable to Terahertz frequency range.
Certainly; more than illustrate and be only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this specification; made all equivalently to substitute, obvious variant, within the essential scope all dropping on this specification, protection of the present invention ought to be subject to.
Claims (3)
1. a Terahertz rectangular waveguide dual directional coupler, is characterized in that, comprises straight-through waveguide substrate, coupling piece and coupled waveguide substrate, and wherein, coupling piece is between straight-through waveguide substrate and coupled waveguide substrate; Straight-through waveguide substrate is provided with straight-through waveguide cavity; Coupled waveguide substrate is provided with two coupled wave guide cavities about coupled waveguide substrate center symmetrically structure; Described coupled wave guide cavity is L-shaped, and it connects to form by a cavity is vertical with No. two cavitys; A cavity of two coupled wave guide cavities all stretches along the length direction of straight-through waveguide cavity; No. two cavitys of two coupled wave guide cavities all stretch along the perpendicular bisector direction of straight-through waveguide cavity; Coupling piece is provided with two groups for being communicated with the coupling aperture of a cavity of straight-through waveguide cavity and coupled wave guide cavity; Straight-through waveguide substrate, coupling piece and coupled waveguide substrate connect successively.
2. a kind of Terahertz rectangular waveguide dual directional coupler according to claim 1, is characterized in that, the length of straight-through waveguide cavity is a cavity length sum of two coupled wave guide cavities.
3. a kind of Terahertz rectangular waveguide dual directional coupler according to claim 1, is characterized in that, the length of straight-through waveguide cavity is 1 to 1.5 times of coupled waveguide substrate upper flange plate diameter.
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| CN201510745987.4A CN105305001B (en) | 2015-11-05 | 2015-11-05 | A kind of Terahertz rectangular waveguide dual directional coupler |
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| CN201510745987.4A CN105305001B (en) | 2015-11-05 | 2015-11-05 | A kind of Terahertz rectangular waveguide dual directional coupler |
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| CN105305001A true CN105305001A (en) | 2016-02-03 |
| CN105305001B CN105305001B (en) | 2018-01-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114113691A (en) * | 2021-11-24 | 2022-03-01 | 电子科技大学 | Waveguide port test fixture capable of realizing calibration and de-embedding technology |
| CN114566779A (en) * | 2022-03-10 | 2022-05-31 | 中国电子科技集团公司第四十一研究所 | MEMS terahertz directional coupler based on gap waveguide and working method thereof |
| CN115117582A (en) * | 2022-08-02 | 2022-09-27 | 四川太赫兹通信有限公司 | Terahertz waveguide structure, radar system and electronic equipment |
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| US20150054595A1 (en) * | 2013-08-23 | 2015-02-26 | University Of South Carolina | Three dimensional branchline coupler using through silicon vias and design structures |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113691A (en) * | 2021-11-24 | 2022-03-01 | 电子科技大学 | Waveguide port test fixture capable of realizing calibration and de-embedding technology |
| CN114566779A (en) * | 2022-03-10 | 2022-05-31 | 中国电子科技集团公司第四十一研究所 | MEMS terahertz directional coupler based on gap waveguide and working method thereof |
| CN115117582A (en) * | 2022-08-02 | 2022-09-27 | 四川太赫兹通信有限公司 | Terahertz waveguide structure, radar system and electronic equipment |
| CN115117582B (en) * | 2022-08-02 | 2024-03-26 | 四川太赫兹通信有限公司 | Terahertz waveguide structure, radar system and electronic equipment |
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