CN202749492U - Micro-strip directional coupler - Google Patents
Micro-strip directional coupler Download PDFInfo
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- CN202749492U CN202749492U CN 201220394103 CN201220394103U CN202749492U CN 202749492 U CN202749492 U CN 202749492U CN 201220394103 CN201220394103 CN 201220394103 CN 201220394103 U CN201220394103 U CN 201220394103U CN 202749492 U CN202749492 U CN 202749492U
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- band
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- directional coupler
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Abstract
The utility model discloses a micro-strip directional coupler which comprises a main micro-strip as a microwave main channel, a secondary micro-strip as a sampling signal channel and coupling holes as coupling channels, wherein the axis of the main micro-strip is in parallel to the axis of the secondary micro-strip; the main micro-strip is communicated with the secondary micro-strip through one or two coupling holes positioned in the grounded surface between the main micro-strip and the secondary micro-strip; the projection of at least one coupling hole is close to the side wall of a conductor belt of the main micro-strip or/and the side wall of a conductor belt of the secondary micro-strip 2; the projections of the coupling holes in the overlook direction are circular; cylindrical metal bodies are arranged in the coupling holes; and the axes of the coupling holes are mutually perpendicular to the axis of the main micro-strip. The micro-strip directional coupler disclosed by the utility model has the advantages of compact structure, simplicity in processing, ultrawide work bandwidth, high power capacity and low insert loss; and particularly at millimeter wave band, compared with a general single-hole directional coupler, the micro-strip directional coupler has remarkable advantages in the aspect of coupling degree.
Description
Technical field
The utility model relates to microstrip directional coupler, specifically, relates to a kind of microstrip directional coupler that utilizes single hole or diplopore to be coupled.
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 consists of two transmission lines, and coaxial line, rectangular waveguide, circular waveguide, strip line and micro-band etc. all can form directional coupler; So of a great variety from the structure directional coupler, widely different, but mainly be 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 also mostly is the Waveguide Hole coupling directional coupler; Its theoretical foundation is the Bethe slot-coupling theory, and the people such as Cohn and Levy have also done a lot of contributions.
Development along with the aerospace technology, require microwave circuit and system to accomplish miniaturization, lightweight and dependable performance, so strip line and micro-band have occurred, the microwave integrated transmission-lines such as fin line, the line of rabbet joint, co-planar waveguide and coplanar stripline have appearred again in needs due to microwave circuit and system in succession subsequently, various transmission line directional couplers so just occurred.
The 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 as narrow bandwidth, directivity, only suitable in the work of design frequency place, drift out this frequency, and directivity will reduce.
Although the tradition multi-hole directional coupler can be accomplished very wide bandwidth, also exists some shortcomings, as large as volume, requirement on machining accuracy is high, insertion loss is high, particularly at the 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 directional coupler that can overcome these shortcomings.
The utility model content
The purpose of this utility model is to overcome some shortcomings of traditional directional coupler, and a kind of compact, microstrip directional coupler that insertion loss is low are provided.
To achieve these goals, the technical solution adopted in the utility model is as follows: microstrip directional coupler comprises mutual isolation the micro-band of the master who is communicated with by coupling aperture and secondary micro-band; The structure of main micro-band and secondary micro-band is identical, and wherein main micro-band and secondary micro-band all consist of dielectric layer printing upper conductor band; Main micro-band and secondary micro-band are isolated mutually by ground plane; Main micro-band is communicated with secondary micro-band by 1 or 2 coupling aperture be positioned on ground plane, the projection section of at least 1 coupling aperture be positioned at the conductor belt of leading micro-band projection sidewall or and the sidewall of the projection of the conductor belt of secondary micro-band; The projection of shape that coupling aperture is overlooked direction at it is for circular
;be provided with parallel with the axis of coupling aperture and vertical with the axis of the main micro-band cylindrical metal body of axis in described coupling aperture.
The projection of shape that this cylindrical metal body is overlooked direction at it is rectangle.
Angle between the axis of the micro-band of described master and the axis of secondary micro-band is between 3 ° to 177 °; The number of described coupling aperture is 2 o'clock, and two coupling apertures lay respectively at main micro-band and intersect after overlooking direction projection near two relative summits of the parallelogram formed with secondary micro-band.
The one or both ends of the micro-band of described master also are connected with crooked micro-band.
Described master micro-band Huo and secondary micro-band are connected with the matching structure with extraneous device matching in its one or both ends.
Based on said structure, the utility model compared to its improvement of single-hole directional coupler in the past is:, traditional coupling aperture is improved to the coupling aperture on the ground plane between main micro-band and secondary micro-band, and with the conductor belt of main micro-band and the conductor belt conducting of secondary micro-band.Can increase its directivity like this.
Angle between the axis of the general micro-band of master and the axis of secondary micro-band is between 3 ° to 177 °.For the volume that makes its whole coupler reduces, we pay the utmost attention to the axis of main micro-band and the axis of secondary micro-band be arranged in parallel, simultaneously, the angular dimension between the axis of the axis of its main micro-band and secondary micro-band is determined through optimizing according to the indexs such as the degree of coupling, directivity and bandwidth of operation of this directional coupler.
When the number of coupling aperture is 1, compare single-hole directional coupler in the past, performance has obvious progress, when the number of coupling aperture increases to 2, can further improve its directivity.
The projection of shape that coupling aperture is overlooked direction at it is unrestricted, and when 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 the 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.
General microstrip directional coupler all obtains by parallel coupling, and the utility model adopts, is the aperture coupling, provides the another kind of thinking that designs microstrip directional coupler to us so again.
The operation principle of single-hole directional coupler can be described below:
Regard the ideal conducting plane as because the waveguide inwall can be similar to, 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 waveguide of main waveguide internal electric field, reach that a part of electric field that complementary wave leads still vertical and the public broadside of major-minor waveguide, an elbow of its power line formation by aperture.Magnetic field (magnetic line of force) is for being parallel to the closed curve of main Guide of Wide Wall, therefore the magnetic field of main waveguide (magnetic line of force) forms one group at the aperture place, pierces into and passes the full curve that complementary wave is led.
Entering by aperture that a part of electric field that complementary wave leads leads the 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 excites, and forms respectively the electromagnetic wave to coupled end and isolation end output.
Entering by aperture that a part of magnetic field that complementary wave leads leads the 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 inducted
', electricity, magnetic field alternately excites, and forms respectively the electromagnetic wave to coupled end and isolation end output.
The aperture coupling is above-mentioned electric coupling and magnetic-coupled stack, and the electromagnetic wave two kinds of couplings formed merges, and we can find out that the electromagnetic wave of past coupled end direction transmission superposes in the same way, forms coupling output; The electromagnetic wave transmitted toward the isolation end direction oppositely superposes, and cancels out each other and forms isolation, so be to export without coupling in principle; But, due to aperture electricity, magnetic-coupled asymmetry, both superpose and have produced directivity.
The utility model has the advantage of: compact conformation, process simple, super wide bandwidth of operation, power capacity is large, insertion loss is low, particularly at millimeter wave band, with common single-hole directional coupler, compares, and aspect the degree of coupling, has outstanding advantage.Compact microstrip directional coupler of the present utility model is expected to be widely used in the electronic system of each microwave band, particularly military affairs and the civil areas such as radar, missile guidance, communication.
The accompanying drawing explanation
The stereogram when axis that Fig. 1 is main micro-band in the utility model and the axis of secondary micro-band are 45 ° of angles.
The vertical view that Fig. 2 is the utility model embodiment mono-.
Fig. 3 is A in the utility model embodiment mono--A profile.
The vertical view that Fig. 4 is the utility model embodiment bis-.
The vertical view that Fig. 5 is the utility model embodiment tri-.
The vertical view that Fig. 6 is the utility model embodiment tetra-.
Label in figure is expressed as respectively: 1, lead micro-band; 2, secondary micro-band; 3, coupling aperture; 7, cylindrical metal body; 4, crooked micro-band; 5, micro-band; 6, ground plane.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but the utility model execution mode is not limited to this.
As shown in Figure 1, microstrip directional coupler, comprise as the master of microwave main channel micro-with 1 and micro-with 2 and as the coupling aperture 3 of coupling channel as the pair of sampled signal passage; Main micro-with 1 axis with secondary micro-with being the angle of 45 ° between 2 axis, main micro-with 1 with secondary micro-ly mutually isolate with 2 ground planes 6 that pass through between them; Main micro-ly be with 1 by 1 or 2 coupling apertures 3, with secondary micro-, to be with 2 to be communicated with, the projection of at least 1 coupling aperture 3 be attached to main micro-with 1 conductor belt sidewall or and pair micro-with 2 conductor belt sidewall; Coupling aperture 3 main micro-be with 1 and secondary micro-be with 2 between and micro-ly be with 1 and secondary micro-ly be with 2 conductings with main
.the projection of shape that wherein coupling aperture 3 is overlooked direction at it is for circular.
Compared to its improvement of single-hole directional coupler in the past, be: traditional coupling aperture is improved to the coupling aperture on the ground plane between main micro-band and secondary micro-band, and with the conductor belt of main micro-band and the conductor belt conducting of secondary micro-band.Can increase its directivity like this.
Embodiment mono-
As shown in Figure 2,3, the present embodiment comprises being provided with main micro-ly is with 1 and secondary micro-ly be with 2, mainly micro-ly is with 1 for the microwave main channel, secondary micro-ly is with 2 for the sampled signal passage; Main micro-with 1 and secondary micro-axis with 2 is parallel to each other, mainly micro-ly is with 1 and secondary micro-ly be with 2 isolation mutually, have the projection of 1 coupling aperture 3 be attached to main micro-with 1 conductor belt sidewall or and secondary micro-with 2 conductor belt sidewall; Coupling aperture 3 main micro-be with 1 and secondary micro-be with 2 between and micro-ly be with 1 and secondary micro-ly be with 2 conductings with main
.in coupling aperture 3, add another axis parallel with the axis of coupling aperture 3 and with main micro-cylindrical metal body 7 vertical with 1 axis, the cross section of this cylindrical metal body 7 be shaped as rectangle, can obtain so the better directional coupler of directivity.
Embodiment bis-
As shown in Figure 4, the place different from embodiment mono-be main micro-be with 1 and secondary micro-be parallel between being with 2, there is no angle.The projection of coupling aperture 3 all only has part main micro-with 1 conductor belt and secondary micro-with 2 conductor belt the inside, and some outside.Cylindrical metal body 7 is not set in coupling aperture 3.
Embodiment tri-
As shown in Figure 5, the place different from embodiment mono-is main micro-ly to be with 1 and secondary micro-ly be communicated with by two coupling apertures 3 between being with 2, and the center of two coupling apertures 3 lays respectively at main micro-with 1 with secondary micro-ly intersect near two relative summits of parallelogram of formations with 2.
Embodiment tetra-
As shown in Figure 6, the place different from embodiment tri-is main micro-ly to be with 1 and secondary micro-ly be with 2 to be communicated with by a coupling aperture 3, at main micro-two ends with 1, have crooked micro-with 4 transition, connecting and micro-ly be with 5 at the micro-other end with 4 of bending, can obtain like this that directivity is better, the wider guide directional coupler of bandwidth.
Just can realize preferably the utility model as mentioned above.
Claims (4)
1. microstrip directional coupler, is characterized in that: comprise mutual isolation the micro-band of master (1) and the secondary micro-band (2) that are communicated with by coupling aperture (3); Main micro-band (1) is identical with the structure of secondary micro-band (2), and wherein main micro-band (1) and secondary micro-band (2) all consist of dielectric layer printing upper conductor band; Main micro-band (1) and secondary micro-band (2) are by ground plane (6) isolation mutually; Main micro-band (1) is communicated with secondary micro-band (2) by 1 or 2 coupling aperture (3) be positioned on ground plane (6), the projection section of at least 1 coupling aperture (3) be positioned at the conductor belt of leading micro-band (1) projection sidewall or and the sidewall of the projection of the conductor belt of secondary micro-band (2); The projection of shape that coupling aperture (3) is overlooked direction at it is for circular
;be provided with parallel with the axis of coupling aperture (3) and vertical with the axis of main micro-band (1) the cylindrical metal body (7) of axis in described coupling aperture (3).
2. microstrip directional coupler according to claim 1, it is characterized in that: the projection of shape that this cylindrical metal body (7) is overlooked direction at it is circle or rectangle or polygon.
3. microstrip directional coupler according to claim 1, it is characterized in that: the angle between the axis of the axis of the micro-band of described master (1) and secondary micro-band (2) is between 3 ° to 177 °; The number of described coupling aperture (3) is 2 o'clock, and two coupling apertures (3) lay respectively at main micro-band (1) and intersect after overlooking direction projection near two relative summits of the parallelogram formed with secondary micro-band (2).
4. according to the described microstrip directional coupler of any one in claim 1-3, it is characterized in that: the micro-band of described master (1) Huo and secondary micro-band (2) are connected with the matching structure with extraneous device matching in its one or both ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220394103 CN202749492U (en) | 2012-08-10 | 2012-08-10 | Micro-strip directional coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220394103 CN202749492U (en) | 2012-08-10 | 2012-08-10 | Micro-strip directional coupler |
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| CN202749492U true CN202749492U (en) | 2013-02-20 |
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| CN 201220394103 Expired - Fee Related CN202749492U (en) | 2012-08-10 | 2012-08-10 | Micro-strip directional coupler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820511A (en) * | 2012-08-10 | 2012-12-12 | 成都赛纳赛德科技有限公司 | Microstrip directional coupler |
| WO2019103856A1 (en) * | 2017-11-27 | 2019-05-31 | Maury Microwave, Inc. | Broadband directional couplers for tem and quasi-tem mode guides and lines |
-
2012
- 2012-08-10 CN CN 201220394103 patent/CN202749492U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820511A (en) * | 2012-08-10 | 2012-12-12 | 成都赛纳赛德科技有限公司 | Microstrip directional coupler |
| WO2019103856A1 (en) * | 2017-11-27 | 2019-05-31 | Maury Microwave, Inc. | Broadband directional couplers for tem and quasi-tem mode guides and lines |
| US10651528B2 (en) | 2017-11-27 | 2020-05-12 | Maury Microwave, Inc. | Broadband directional couplers for TEM and quasi-TEM mode guides and lines |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130220 Termination date: 20150810 |
|
| EXPY | Termination of patent right or utility model |