CN108963407A - A kind of three dovetail metallic membrane orthomode couplers - Google Patents
A kind of three dovetail metallic membrane orthomode couplers Download PDFInfo
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- CN108963407A CN108963407A CN201810946749.3A CN201810946749A CN108963407A CN 108963407 A CN108963407 A CN 108963407A CN 201810946749 A CN201810946749 A CN 201810946749A CN 108963407 A CN108963407 A CN 108963407A
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- dovetail
- waveguide
- output end
- rectangular waveguide
- rectangular
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
Abstract
The present invention relates to a kind of three dovetail metallic membrane orthomode couplers comprising: main waveguide (1), three dovetail metallic membranes (8), the first rectangular waveguide (6) and the second rectangular waveguide (5)；The input terminal of main waveguide (1) is rectangular waveguide, and the first output end of main waveguide (1) docks the first rectangular waveguide (6), the extension as main waveguide (1)；Second rectangular waveguide (5) is vertically connected on the bottom of main waveguide (1), and the second rectangular waveguide (5) is connected to the bottom of main waveguide (1)；Three dovetail metallic membranes (8) are embedded on the inner wall of main waveguide (1) and the inner wall of the second rectangular waveguide (5), and three dovetail metallic membranes (8) are provided with narrow slit (7).
Description
Technical field
The invention belongs to millimeter wave ultra-wideband dual polarized signals separation technology fields, and in particular to a kind of three dovetail metal films
Piece orthomode coupler.
Background technique
Polarization is the important attribute and parameter of electromagnetic wave, in microwave remote sensing and communication, generally requires dual polarized signals biography
Defeated realization polarization, channeling.Therefore, the extraction of dual polarized signals seems most important.Currently, usually dual polarized signals are mentioned
The device taken is orthomode coupler (OMT).Orthomode coupler is a kind of very common microwave device, in order to realize orthogonal mode
The broadband character of coupler needs that many impedance matchings are added in orthomode coupler, so that the structure of component is set compared with narrowband
Timing is more complicated.Due to the limitation of structure space, while needing to carry out observed object multi-frequency, multipolarization observation, in reality
Wish the signal for using an antenna to obtain broadband as far as possible, this avoid using directional diagram caused by mutiple antennas observation
Distortion (i.e. different feeds cannot be all placed in focus) and observed object angle are not overlapped that (mutiple antennas can not be placed on same
Position, therefore to the observation angle of same target difference), therefore, multi-frequency multiplexing, dual polarization are realized using a common antenna
Multiplexing is of great significance.
Traditional orthomode coupler includes: sheet metal orthomode coupler, turnsile orthomode coupler and circle
Column type orthomode coupler can achieve the frequency bandwidth ratio of 1.2:1 to 1.8:1.But when frequency range is excessive,
For example, band ratio is more than 2:1, traditional orthomode coupler seems helpless.Last century the nineties, the prior art propose
Fin orthomode coupler, can achieve 2:1 bandwidth ratio；But fin orthomode coupler is only used for C, X even L wave
Section, when frequency increases to millimere-wave band, the vertical polarization loss of signal of design result is serious, can not achieve millimeter wave completely
The extraction of dual polarized signals.
Summary of the invention
It is an object of the present invention to solve existing orthomode coupler, there are drawbacks described above, and the invention proposes one
Three dovetail metallic membrane orthomode couplers of kind, realize the extraction of millimeter wave dual polarized signals；The orthomode coupler includes:
Main waveguide, three dovetail metallic membranes, the first rectangular waveguide and the second rectangular waveguide；
The input terminal of main waveguide is rectangular waveguide, and the first output end of the side of main waveguide docks the first rectangular waveguide, makees
For the extension of main waveguide；Second rectangular waveguide is vertically connected on the bottom of main waveguide, and the second rectangular waveguide and main waveguide
Bottom connection；Three dovetail metallic membranes are embedded on the inner wall of main waveguide and the inner wall of the second rectangular waveguide, and three dovetail metals
Diaphragm is provided with narrow slit；
Dual polarization millimeter wave is input to the input terminal of main waveguide, millimeter of the polarization direction perpendicular to three dovetail metallic membranes
Wave, i.e. vertically polarized wave pass through three dovetail metallic membranes, and import in the first rectangular waveguide of extension of main waveguide；Polarization
It is oriented parallel to the millimeter wave of three dovetail metallic membranes, i.e. horizontal polarized wave, the narrow slit opened up across three dovetail metallic membranes, and
It imports in the second rectangular waveguide, realizes the extraction of the dual polarized signals of the millimeter wave of the ultrabroad band ratio of 2:1, effectively ensure low frequency
Signal does not end, and high frequency higher mode is avoided to propagate.
One of as an improvement of the above technical solution, the three dovetails metallic membrane includes: the first dovetail input terminal, first
Three dovetail ends of dovetail output end and the second dovetail output end；
Wherein, the dovetail type input port of the first dovetail input terminal is greater than the dovetail type delivery outlet of the first dovetail output end, uses
It passes through in the millimeter wave that polarization direction is parallel to three dovetail metallic membranes, is exported by the delivery outlet of the first dovetail output end, and
It imports in the first rectangular waveguide of the extension of main waveguide；
The dovetail type delivery outlet of first dovetail output end is greater than the dovetail type delivery outlet of the second dovetail output end, and the first swallow
Narrow slit is opened up between tail input terminal and the second dovetail output end, for the millimeter by polarization direction perpendicular to three dovetail metallic membranes
Wave passes through, and is exported by the second dovetail output end, and imports in the second rectangular waveguide.
One of as an improvement of the above technical solution, the angle that the dovetail type input port of the first dovetail input terminal is opened is less than
The angle that the dovetail type delivery outlet of first dovetail output end opens；The angle of the opening of the dovetail type delivery outlet of first dovetail output end
Degree is greater than the angle that the dovetail type delivery outlet of the second dovetail output end opens；Effectively reduce the signal of millimeter wave horizontal polarized wave
Decaying, while ensuring that the signal of vertically polarized wave is smoothly imported the second rectangular waveguide by narrow slit.
One of as an improvement of the above technical solution, the side of the first rectangular waveguide is rectangular waveguide, is used for and main waveguide
Side the first output end docking；The other side of first rectangular waveguide is rectangular waveguide, and the cross-sectional area of rectangular waveguide is small
In the cross-sectional area of rectangular waveguide, the decaying of millimeter wave horizontal polarization signals is advantageously reduced.
One of as an improvement of the above technical solution, the three dovetails metallic membrane orthomode coupler is adapted to K to Ka
Frequency range, and can expand to higher frequency section, there is low-loss, ultra wide band characteristic；Ultrabroad band multiplexing, dual polarization multiplexing may be implemented
Function, have more important meaning, have wide practical use in microwave remote sensing, millimetre-wave attenuator field.
The present invention has the advantages that
The bandwidth of orthomode coupler of the invention is 1.2 to 2 times wider than the broadband of existing orthomode coupler, than general
Want wide in the broadband of logical orthomode coupler；In addition, three dovetail metallic membrane orthomode couplers of the invention are than fin diaphragm
The adaptation frequency range of orthomode coupler is wider, and higher frequency, which is expanded, has reference function.In addition, three swallows of the invention
Tail metallic membrane orthomode coupler is different from general narrowband orthomode coupler, also different from general fin shape orthogonal mode
Coupler is more advantageous to using three dovetail configurations and realizes the transmission of millimeter wave broadband signal, standing-wave ratio is effectively reduced, favorably
In the matching of horizontal polarized wave, reduce horizontal polarization wave attenuation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of three dovetail metallic membrane orthomode coupler of one kind of the invention；
Fig. 2 is the structural schematic diagram of the main waveguide of the three dovetail metallic membrane orthomode coupler of one kind of the invention of Fig. 1；
Fig. 3 is the structure of the second rectangular waveguide of the three dovetail metallic membrane orthomode coupler of one kind of the invention of Fig. 1
Schematic diagram；
Fig. 4 is the structure of the first rectangular waveguide of the three dovetail metallic membrane orthomode coupler of one kind of the invention of Fig. 1
Schematic diagram；
Fig. 5 is the knot of three dovetail metallic membranes of the three dovetail metallic membrane orthomode coupler of one kind of the invention of Fig. 1
Structure schematic diagram；
Fig. 6 is the second dovetail output end of three dovetail metallic membranes of the invention and the S11 of equal length ordinary rectangular diaphragm
Comparative bid parameter；
Fig. 7 is that the measured result of three dovetail metallic membrane orthomode coupler of one kind and corrugation loudspeaker feed source of the invention shows
It is intended to.
Appended drawing reference:
1, main waveguide 2, the first dovetail input terminal
3, the first dovetail output end 4, the second dovetail output end
5, the second rectangular waveguide 6, the first rectangular waveguide
7, narrow slit 8, three dovetail metallic membranes
Specific embodiment
Now in conjunction with attached drawing, the invention will be further described.
As shown in Figure 1, realizing millimeter wave dual polarization the invention proposes a kind of three dovetail metallic membrane orthomode couplers
The extraction of signal；The orthomode coupler includes: main waveguide 1, three dovetail metallic membranes 8, the first rectangular waveguide 6 and the second square
Shape waveguide 5；In the present embodiment, as shown in Figure 2,3, 4, the port of the input terminal in the left side of the main waveguide 1 is 10.67mm*
The rectangular waveguide of 10.67mm, i.e. a1*a1=10.67mm*10.67mm；Three dovetail metallic membranes 8 with a thickness of 2mm, the first square
Shape waveguide 6 is the rectangular waveguide of 10.67mm*4.32mm, i.e. a2*b2=10.67mm*4.32mm；Second rectangular waveguide 5 is
The rectangular waveguide of 10.67mm*4.32mm, i.e. a3*b3=10.67mm*4.32mm, i.e. duct width and height are the same,
Due to being only divided into dual polarization, operating frequency range is the same.
As illustrated in fig. 1 and 2, the input terminal of main waveguide 1 is rectangular waveguide, the first output end docking on 1 right side of main waveguide the
One rectangular waveguide 6, the extension as main waveguide 1；Second rectangular waveguide 5 is vertically connected on the bottom of main waveguide 1, and the second square
Shape waveguide 5 is connected to the bottom of main waveguide 1；Three dovetail metallic membranes 8 are embedded in the inner wall and the second rectangular waveguide 5 of main waveguide 1
Inner wall on, and three dovetail metallic membranes 8 are provided with narrow slit 7；
Dual polarization millimeter wave is input to the input terminal in main 1 left side of waveguide, and polarization direction is perpendicular to three dovetail metallic membranes 8
Millimeter wave, i.e. vertically polarized wave pass through three dovetail metallic membranes 8, and import the first rectangular waveguide 6 of the extension of main waveguide 1
It is interior；Polarization direction is parallel to the millimeter wave of three dovetail metallic membranes 8, i.e. horizontal polarized wave, opens up across three dovetail metallic membranes 8
Narrow slit 7, and import the second rectangular waveguide 5 in, realize the extraction of the dual polarized signals of the millimeter wave of the ultrabroad band ratio of 2:1,
Effectively ensure that low frequency signal does not end, high frequency higher mode is avoided to propagate.And traditional low-frequency rate (such as C-band) orthomode coupler
Metallic membrane hole is minimum, diaphragm thickness relative wavelength is also relatively thin, the metallic membrane of traditional millimeter wave orthomode coupler
It is lost greatly when hole is too small, and hole increase necessarily brings thickness to increase, and vertical polarization millimeter wave could be made smoothly to couple
To side wall waveguide, still, thickness increase can cause main waveguide return loss to increase severely, thus the orthomode coupler of traditional low-frequency without
Method realizes the extraction of the dual polarized signals of millimeter wave.
One of as an improvement of the above technical solution, as shown in figure 5, the three dovetails metallic membrane 8 includes: the first dovetail
4 three input terminal 2, the first dovetail output end 3 and the second dovetail output end dovetail ends；Wherein, the end of the second dovetail output end 4
The width in portion is 4.32mm；
The dovetail type that the lateral length of the dovetail type input port of first dovetail input terminal 2 is greater than the first dovetail output end 3 is defeated
The lateral length of outlet, the millimeter wave for polarization direction to be parallel to three dovetail metallic membranes 8 pass through, and are exported by the first dovetail
The delivery outlet output at end 3, and import in the first rectangular waveguide 6 of extension of main waveguide 1；
The dovetail type delivery outlet of first dovetail output end 3 is greater than the dovetail type delivery outlet of the second dovetail output end 4, and first
Narrow slit 7 is opened up between dovetail input terminal 2 and the second dovetail output end 4, is used for polarization direction perpendicular to three dovetail metallic membranes 8
Millimeter wave pass through, exported by the second dovetail output end 4, and import the second rectangular waveguide 5 in.
Wherein, the structure of three of three dovetail metallic membranes 8 different dovetail type ends is different from common fin structure,
Three dovetail metallic membranes in main waveguide 1 are compared with the rectangle diaphragm of equal length, are had better transmission characteristic, are effectively reduced
Return loss.Seriously much due to millimeter-wave signal attenuation ratio C-band, hole that cannot be extremely narrow using that relative wavelength of C-band
Gap, otherwise serious decaying will be so that millimeter wave can not pass through, and relatively wide hole must be by slightly thicker diaphragm Lai real
Existing millimeter-wave signal coupling, thicker diaphragm can cause the decaying and loss of horizontal polarized wave, therefore, the first dovetail output end 3
Thick film piece bring millimeter wave transmission loss can be effectively reduced in the dovetail configuration of use.
One of as an improvement of the above technical solution, the angle that the dovetail type input port of the first dovetail input terminal 2 is opened is small
In the angle that the dovetail type delivery outlet of the first dovetail output end 3 opens；The opening of the dovetail type delivery outlet of first dovetail output end 3
Angle be greater than the second dovetail output end 4 dovetail type delivery outlet open angle；Effectively reduce millimeter wave horizontal polarized wave
Signal decaying, while ensuring that the signal of vertically polarized wave is smoothly imported the second rectangular waveguide by narrow slit.
One of as an improvement of the above technical solution, the side of the first rectangular waveguide 6 is rectangular waveguide, is used for and main waveguide
First output end on 1 right side docks；The other side of first rectangular waveguide 6 is rectangular waveguide, and the cross-sectional area of rectangular waveguide
Less than the cross-sectional area of rectangular waveguide, the decaying of millimeter wave horizontal polarization signals is advantageously reduced.
One of as an improvement of the above technical solution, the three dovetails metallic membrane orthomode coupler is adapted to K to Ka
Frequency range, and can expand to higher frequency section, there is low-loss, ultra wide band characteristic；Ultrabroad band multiplexing, dual polarization multiplexing may be implemented
Function, have more important meaning, have wide practical use in microwave remote sensing, millimetre-wave attenuator field.
As shown in fig. 6, three dovetail metallic membranes of the invention and equal length ordinary rectangular diaphragm S11 parameter have been carried out pair
Than.As can be seen that being coupled using three dovetail metallic membrane orthomode coupler S11 of the invention than existing ordinary rectangular diaphragm
Device S11 parameter has larger improvement, and specifically, within the scope of the working band of 23.5-24.1GHz, three dovetail metallic membranes are just
The S11 of mode coupler is handed over to be respectively less than -25dB in frequency band, substantially in -30 to -50dB ranges, and existing common rectangular membrane
Piece S11 is in -16 to -19dB ranges.
As shown in fig. 7, Oriented Graphics with Assigned Form and minor level are respectively -23dB and -16dB, gain in 13.9GHz frequency
For 29.23dB.
The three dovetails metallic membrane orthomode coupler is optimized using HFSS full wave analysis software, mainly
Physical varification is processed, it is ensured that the accuracy of design according to optimum results to the optimization structure size of S parameter.Test result is shown
The three dovetails metallic membrane orthomode coupler bandwidth reaches 2:1 frequency bandwidth ratio, demonstrates the accuracy of design.It processes
At the three dovetails metallic membrane orthomode coupler and corrugation loudspeaker feed source measured result as shown in Figure 7, it can be seen that water
Mean pole and vertical polarization channel signal maintain preferable S parameter characteristic, especially water within the scope of 18GHz to 40GHz
The signal of flat polarized wave is in the frequency range of 19-40GHz, and frequency band is in -20dB hereinafter, vertical polarization Bobbi horizontal polarized wave
S parameter is slightly worse, and individual frequency points have jump to -10dB, but population mean is in -15dB or so, in specifically used, the first rectangular wave
The filter of frequency needed for docking respectively with the second rectangular waveguide is led, there will be better results.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (5)
1. a kind of three dovetail metallic membrane orthomode couplers, characterized in that it comprises: main waveguide (1), three dovetail metal films
Piece (8), the first rectangular waveguide (6) and the second rectangular waveguide (5)；
The input terminal of main waveguide (1) is rectangular waveguide, and the first output end of main waveguide (1) docks the first rectangular waveguide (6), as
The extension of main waveguide (1)；Second rectangular waveguide (5) is vertically connected on the bottom of main waveguide (1), and the second rectangular waveguide (5)
It is connected to the bottom of main waveguide (1)；Three dovetail metallic membranes (8) are embedded in the inner wall and the second rectangular waveguide (5) of main waveguide (1)
Inner wall on, and three dovetail metallic membranes (8) are provided with narrow slit (7).
2. three dovetails metallic membrane orthomode coupler according to claim 1, which is characterized in that the three dovetails metal
Diaphragm (8) includes: the first dovetail input terminal (2), the first dovetail output end (3) and the second dovetail output end (4)；
Wherein, the dovetail type input port of the first dovetail input terminal (2) is greater than the dovetail type delivery outlet of the first dovetail output end (3),
Millimeter wave for polarization direction to be parallel to three dovetail metallic membranes (8) passes through, by the delivery outlet of the first dovetail output end (3)
Output, and import in the first rectangular waveguide (6)；
The dovetail type delivery outlet of first dovetail output end (3) is greater than the dovetail type delivery outlet of the second dovetail output end (4), and first
Narrow slit (7) are opened up between dovetail input terminal (2) and the second dovetail output end (4), for polarization direction is golden perpendicular to three dovetails
The millimeter wave for belonging to diaphragm (8) passes through, and is exported by the second dovetail output end (4), and imports in the second rectangular waveguide (5).
3. three dovetails metallic membrane orthomode coupler according to claim 2, which is characterized in that the first dovetail input terminal
(2) angle that dovetail type input port is opened is less than the angle that the dovetail type delivery outlet of the first dovetail output end (3) opens；First
The angle of the opening of the dovetail type delivery outlet of dovetail output end (3) is greater than the dovetail type delivery outlet of the second dovetail output end (4)
The angle opened.
4. three dovetails metallic membrane orthomode coupler according to claim 1, which is characterized in that first rectangular wave
The side for leading (6) is rectangular waveguide, for docking with the first output end of the side of main waveguide (1)；First rectangular waveguide (6)
The other side is rectangular waveguide, and the cross-sectional area of rectangular waveguide is less than the cross-sectional area of rectangular waveguide.
5. three dovetails metallic membrane orthomode coupler according to claim 1, which is characterized in that the three dovetails metal
Diaphragm orthomode coupler is adapted to K to Ka frequency range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810946749.3A CN108963407A (en) | 2018-08-20 | 2018-08-20 | A kind of three dovetail metallic membrane orthomode couplers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810946749.3A CN108963407A (en) | 2018-08-20 | 2018-08-20 | A kind of three dovetail metallic membrane orthomode couplers |
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|---|---|
| CN108963407A true CN108963407A (en) | 2018-12-07 |
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ID=64470829
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335963A (en) * | 2022-03-10 | 2022-04-12 | 广州中雷电科科技有限公司 | Orthogonal mode coupler and design method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB789639A (en) * | 1941-07-25 | 1958-01-22 | Western Electric Co | Improvements in coupling arrangements for electromagnetic wave transmission paths |
| JPS63310202A (en) * | 1987-06-11 | 1988-12-19 | Mitsubishi Electric Corp | Circularly polarized wave generator |
| JP2012147421A (en) * | 2010-12-20 | 2012-08-02 | Nippon Telegr & Teleph Corp <Ntt> | Finline type ortho-mode transducer |
| CN107742767A (en) * | 2017-09-19 | 2018-02-27 | 西安电子科技大学 | Fin line type orthomode coupler based on double ridge ledge structures |
-
2018
- 2018-08-20 CN CN201810946749.3A patent/CN108963407A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB789639A (en) * | 1941-07-25 | 1958-01-22 | Western Electric Co | Improvements in coupling arrangements for electromagnetic wave transmission paths |
| JPS63310202A (en) * | 1987-06-11 | 1988-12-19 | Mitsubishi Electric Corp | Circularly polarized wave generator |
| JP2012147421A (en) * | 2010-12-20 | 2012-08-02 | Nippon Telegr & Teleph Corp <Ntt> | Finline type ortho-mode transducer |
| CN107742767A (en) * | 2017-09-19 | 2018-02-27 | 西安电子科技大学 | Fin line type orthomode coupler based on double ridge ledge structures |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335963A (en) * | 2022-03-10 | 2022-04-12 | 广州中雷电科科技有限公司 | Orthogonal mode coupler and design method |
| CN114335963B (en) * | 2022-03-10 | 2022-06-07 | 广州中雷电科科技有限公司 | Orthogonal mode coupler and design method |
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