CN101752631B - Rectangle waveguide based on magnetic coupling principle and microstrip transitional conversion circuit - Google Patents
Rectangle waveguide based on magnetic coupling principle and microstrip transitional conversion circuit Download PDFInfo
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- CN101752631B CN101752631B CN2010100038763A CN201010003876A CN101752631B CN 101752631 B CN101752631 B CN 101752631B CN 2010100038763 A CN2010100038763 A CN 2010100038763A CN 201010003876 A CN201010003876 A CN 201010003876A CN 101752631 B CN101752631 B CN 101752631B
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Abstract
The invention discloses a rectangle waveguide based on magnetic coupling principle and a microstrip transitional conversion circuit, and belongs to waveguide-microstrip transitional conversion technology of microwave MMW. The transitional conversion circuit comprises a microstrip line, an eccentric coaxial line and a coupling ring connected together sequentially, wherein the terminal of the coupling ring is connected with a grounding structure, and an independent metal strip is arranged on the side of the coupling ring. The invention is based on the magnetic coupling principle and realizes the mode transitional conversion of electromagnetic fields between dominant modes of the rectangle waveguide and the microstrip line, and accordingly finishes the electromagnetic signal transmission between the rectangle waveguide and the microstrip line; the transitional conversion circuit has the characteristics of ingenious design, compact structure, stable performance, low insertion loss and good standing wave property.
Description
Technical field
The present invention relates to the transition and conversion circuit of rectangular waveguide and little band, specifically, relate to a kind of rectangular waveguide and microstrip transition change-over circuit based on magnetic coupling principle.
Background technology
Rectangular waveguide and microstrip line are the important transmission mediums of microwave and millimeter wave frequency range.At present; Rectangular waveguide that is adopted in the practical applications and the transition and conversion circuit between the microstrip line; Different according to the relative position relation of rectangular waveguide interface end face and microstrip substrate face, alternative circuit form mainly contains: rectangular waveguide-to utmost point fin line-microstrip transition, rectangular waveguide-ridge waveguide-microstrip transition, rectangular waveguide-little band probe transitions and rectangular waveguide-coaxial probe-typical structures such as microstrip transition.These transition and conversion circuit of all reports; Accomplish electromagnetic field mode conversion between rectangular waveguide and the main mould of microstrip line, when realizing the transmission of electromagnetic signal between these two kinds of different transmission mediums, the mode that all is based on the excitation of rectangular waveguide internal electric field realizes.
Summary of the invention
The object of the present invention is to provide a kind of and diverse rectangular waveguide of prior art scheme and microstrip transition change-over circuit; Realize the transmission of electromagnetic signal between rectangular waveguide and microstrip line based on magnetic coupling principle, and have and insert that loss is little, stationary wave characteristic good, the characteristics of bandwidth.
To achieve these goals, the technical scheme of the present invention's employing is following:
Rectangular waveguide and microstrip transition change-over circuit based on magnetic coupling principle is characterized in that, comprise the microstrip line, eccentric coaxial line and the coupling loop that are linked in sequence, are connected with ground structure at the terminal of coupling loop.
Said coupling loop side also is provided with independent metal band.
Said microstrip line, eccentric coaxial line, ground structure, coupling loop and independent metal band are arranged at on a slice dielectric substrate, and ground structure is arranged at the edge of dielectric substrate.
Said dielectric substrate is outside equipped with rectangular waveguide, and the part that contains coupling loop and independent metal band on the dielectric substrate is arranged in the E face of rectangular waveguide broadside center, and remainder is positioned at outside the rectangular waveguide.
The metal thickness of said coupling loop, independent metal band, eccentric coaxial line, microstrip line is identical.
Said coupling loop be shaped as arbitrary shape, like semicircle, fan-shaped, triangle, rectangle etc.
Said eccentric coaxial line is made up of the ladder formed two sections metal conduction bands that suddenly change.
Realization principle of the present invention is: coupling loop is arranged at rectangular waveguide master mould TE
10Strength, the magnetic field of mould, and the anchor ring of this coupling loop and rectangular waveguide master mould TE
10The magnetic line of force of mould is vertical each other; After microwave generating source is gone up in the connection of the microstrip line port on the dielectric substrate; High frequency induction current on it will flow through from the conduction band of coupling loop, at this moment, will in rectangular waveguide, produce alternating magnetic field; Its magnetic line of force is the little anchor ring that passes coupling loop, be parallel to Wide Wall of Rectangular Waveguide, be tangential on the closed line one by one of narrow wall; The alternating electric field that alternating magnetic field produced thus is then vertical with the magnetic field interlinkage, drops on the rectangular waveguide broadside on the wall surfaces its electromagnetic field main mould TE with rectangular waveguide that distributes
10Mould is identical.
In addition, independent metal band is provided with the stationary wave characteristic that can further improve the transition and conversion circuit port.
Compared with prior art, the rectangular waveguide based on magnetic coupling principle-microstrip transition change-over circuit that the present invention proposes not only has very big difference on the principle, also be different from prior art on the structure fully.Through test, the transition and conversion circuit that the present invention carried, in the frequency range of 27～40GHz, it inserts loss less than 0.6dB, and return loss is superior to 13.5dB.Hence one can see that, and the present invention has realized the transmission of electromagnetic signal between rectangular waveguide and microstrip line well, thereby a kind of brand-new selection scheme is provided for the engineering design of transition and conversion between the rectangular waveguide of microwave and millimeter wave frequency range and the microstrip line.
The present invention designs ingenious, and compact conformation is exempted from debugging, and stable performance, is mainly used in the electromagnetic signal transmission field of microwave and millimeter wave frequency range, especially for transition, the transmission field between waveguide-little band.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is the perspective view of upper cavity among the present invention-embodiment.
Fig. 3 is for containing the sketch map of the dielectric substrate of a pair of circuit of transition and conversion back-to-back among the present invention-embodiment.
Fig. 4 is lower chamber among the present invention-embodiment and the dielectric substrate vertical view after assembling.
Fig. 5 among the present invention-embodiment at the simulation result sketch map of Ka wave band.
Fig. 6 is the measured result sketch map of sample among the present invention-embodiment at the Ka wave band.
The corresponding title of label in the accompanying drawing: 1-microstrip line, 2-eccentric coaxial line, 3-ground structure, 4-coupling loop, 5-independence metal band, 6-dielectric substrate, 7-ledge, 8-rectangular enclosure, 9-strip channel, 10-screw hole.
Embodiment
As shown in Figure 1; Rectangular waveguide and microstrip transition change-over circuit based on magnetic coupling principle of the present invention formed by being arranged at the microstrip line on a slice dielectric substrate 1, eccentric coaxial line 2, ground structure 3, coupling loop 4 and independent metal band 5; Wherein, Microstrip line 1, eccentric coaxial line 2, coupling loop 4 are linked in sequence, and ground structure 3 is arranged at the terminal of coupling loop 4, and are positioned at the edge of dielectric substrate 6.Independent metal band 5 is positioned at the side of coupling loop 4.
Embodiment
Below in conjunction with accompanying drawing and instantiation occupation mode of the present invention and performance are elaborated.
Be convenient test, at first two identical change-over circuits of the present invention as shown in Figure 3 be arranged on the same dielectric substrate 6 symmetrically, and the microstrip line in two change-over circuits 1 is connected, two change-over circuits are communicated with.Prepare a upper cavity and a lower chamber then, the external shape size of upper cavity and lower chamber is identical.Said upper cavity comprises a rectangular enclosure 8; And the strip channel 9 that is arranged at rectangular enclosure 8 two ends and is communicated with it; This strip channel 9 wide and be standard rectangular waveguide broadside size deeply; On two medial surfaces of strip channel 9, be respectively equipped with a ledge 7, to constitute the outer conductor inside dimension of eccentric coaxial line 2; Said lower chamber internal structure and upper cavity are basic identical; Also form by a rectangular enclosure 8 and the strip channel 9 that is arranged at rectangular enclosure 8 two ends and be communicated with it; 9 liang of medial surfaces of strip channel at upper cavity also are respectively equipped with a ledge 7, but the distance between two ledges 7 on the lower chamber on the same strip channel 9 is at least than the big 5mm of distance between two ledges 7 on the same strip channel 9 on the upper cavity.Ledge 7 in the said upper cavity and the ledge 7 in the lower chamber all are arranged at the junction of corresponding strip channel 9 and rectangular enclosure 8.The structural representation of upper cavity is as shown in Figure 2.
The aforementioned dielectric substrate that is provided with two change-over circuits is installed on the lower chamber; As shown in Figure 4; Wherein, coupling loop 4 is semicircle, and the part dielectric substrate that contains coupling loop 4 and independent metal band 5 is arranged in the strip channel 9 at lower chamber two ends; Then with the upper cavity assembling of aliging with lower chamber; At this moment, the strip channel 9 of the homonymy on strip channel on the upper cavity 9 and the lower chamber is merged into rectangular waveguide, and dielectric substrate contains the two ends of coupling loop 4 and independent metal band 5 and lays respectively in the rectangular waveguide.Be respectively equipped with some screw holes 10 up and down on the cavity; Can be through screw with the cavity assembling is fixing up and down; Form an integral body, the ground structure 3 at coupling loop 4 terminals is connected with the interior ledge 7 of rectangular waveguide, and utilizes rectangular waveguide to realize the DC earthing of whole change-over circuit.Signal gets into the coupling loop 4 on the dielectric substrate 6 through rectangular waveguide; In coupling loop, produce magnetic field; And convert the signal of telecommunication to by magnetic signal; Be transferred to microstrip line 1 through eccentric coaxial line 2, finally realize the mode transition conversion of electromagnetic field between rectangular waveguide and microstrip line 1 both main moulds, accomplish the transmission of electromagnetic signal between rectangular waveguide-microstrip line.
For guaranteeing normally carrying out and coupling effect of magnetic field coupling, the metal thickness of microstrip line 1, eccentric coaxial line 2, coupling loop 4, independent metal band 5 four should be identical, and the back side that is positioned at dielectric substrate 6 parts of rectangular waveguide should not be provided with metal level.Independent metal band 5 is generally rectangular strip, can further improve the stationary wave characteristic of transition and conversion circuit port.
According to above-mentioned theory, carry out design of Simulation on computers earlier below, and then utilize the physical dimension processing sample of design of Simulation, at last the performance of sample is tested.
The software of analog computation uses CST microwave simulation software, and dielectric substrate adopts the Duriod5880 dielectric substrate of Rogers company, and its relative dielectric constant is 2.22, and the substrate dielectric thickness is 0.254mm, and the metal thickness of two sides copper-clad is 0.017mm; Microstrip line adopts 50 ohm of standard microstrip lines of Ka wave band of 20 millimeters long, and its metal conduction band width is 0.76mm; Eccentric coaxial line adopts by the suddenly change metal conduction band of formed two sections different sizes of ladder forms rectangular waveguide employing BJ-320 size.
In 26.5～40GHz frequency range, the foregoing description is carried out analog simulation, the analog simulation result is as shown in Figure 5, by return loss plot S shown in Figure 5
11With insertion damage curve S
21Can know that return loss is superior to 13.5dB, insert loss less than 1.2dB.Owing to adopted two identical change-over circuits in the foregoing description, then each change-over circuit return loss when accomplishing the transition and conversion of electromagnetic signal between rectangular waveguide-microstrip line is superior to 13.5dB, inserts loss less than 0.6dB.This analog result shows that the present invention has realized transition and conversion and the transmission of electromagnetic signal between rectangular waveguide-little band well.The model that adopts Agilent company to produce is that the vector network analyzer of E8363B carries out the sample test of the foregoing description, its performance test sketch map such as Fig. 6.The return loss plot S that shows among the figure
11With insertion damage curve S
21Very close with Thesimulation result, also confirmed simulation result thus, prove that the present invention is not only feasible, and implementation result has has met or exceeded prior art.Therefore, the present invention is not only a kind of brand-new selection scheme in the engineering design of transition and conversion between rectangular waveguide and the microstrip line of microwave and millimeter wave frequency range, and compact conformation, and stable performance has very high value.
Claims (9)
1. based on the rectangular waveguide and the microstrip transition change-over circuit of magnetic coupling principle; It is characterized in that; Comprise the microstrip line (1), eccentric coaxial line (2) and the coupling loop (4) that are linked in sequence, be connected with ground structure (3) at the terminal of coupling loop, said coupling loop (4) side also is provided with independent metal band (5).
2. rectangular waveguide and microstrip transition change-over circuit based on magnetic coupling principle according to claim 1; It is characterized in that said microstrip line (1), eccentric coaxial line (2), ground structure (3), coupling loop (4) and independent metal band (5) are arranged at on a slice dielectric substrate (6).
3. rectangular waveguide and microstrip transition change-over circuit based on magnetic coupling principle according to claim 2 is characterized in that said ground structure (3) is arranged at the edge of dielectric substrate (6).
4. rectangular waveguide and microstrip transition change-over circuit based on magnetic coupling principle according to claim 2; It is characterized in that; Said dielectric substrate (6) is outside equipped with rectangular waveguide; The part that contains coupling loop (4) and independent metal band (5) on the dielectric substrate (6) is arranged in the E face of rectangular waveguide broadside center, and remainder is positioned at outside the rectangular waveguide.
5. according to claim 1 or 4 described rectangular waveguide and microstrip transition change-over circuits, it is characterized in that the thickness of said independent metal band (5) is identical with the thickness of microstrip line (1) based on magnetic coupling principle.
6. according to claim 1 or 4 described rectangular waveguide and microstrip transition change-over circuits, it is characterized in that the inner wire thickness of said eccentric coaxial line (2) is identical with the thickness of microstrip line (1) based on magnetic coupling principle.
7. according to claim 1 or 4 described rectangular waveguide and microstrip transition change-over circuits, it is characterized in that the thickness of said coupling loop (4) is identical with the thickness of microstrip line (1) based on magnetic coupling principle.
8. according to claim 1 or 4 described rectangular waveguide and microstrip transition change-over circuits, it is characterized in that based on magnetic coupling principle, said coupling loop (4) be shaped as semicircle/fan-shaped/triangle/rectangle.
9. according to claim 1 or 4 described rectangular waveguide and microstrip transition change-over circuits, it is characterized in that said eccentric coaxial line (2) is made up of the ladder formed two sections metal conduction bands that suddenly change based on magnetic coupling principle.
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| CN2010100038763A CN101752631B (en) | 2010-01-07 | 2010-01-07 | Rectangle waveguide based on magnetic coupling principle and microstrip transitional conversion circuit |
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| US9118356B2 (en) * | 2013-02-19 | 2015-08-25 | Apple Inc. | Data transport in portable electronic devices |
| CN104331535A (en) * | 2014-09-22 | 2015-02-04 | 安徽华东光电技术研究所 | V waveband microstrip probe type waveguide microstrip switching circuit and parameter design method |
| CN105977595A (en) * | 2016-06-06 | 2016-09-28 | 中国电子科技集团公司第三十八研究所 | Terminal connection feed-backward type rectangular waveguide-microstrip transition device |
| CN110289472B (en) * | 2019-07-15 | 2021-08-31 | 中国科学院近代物理研究所 | Rectangular cavity type power combiner |
| CN111628262B (en) * | 2020-06-09 | 2021-10-22 | 西安电子工程研究所 | Ka-band double-semicircular-ring magnetic coupling power divider |
| CN112886169B (en) * | 2021-03-29 | 2021-10-26 | 电子科技大学 | Rectangular waveguide-to-coaxial converter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2219438A (en) * | 1988-05-28 | 1989-12-06 | Marconi Co Ltd | Coupling transmission lines |
| CN201655932U (en) * | 2010-01-07 | 2010-11-24 | 电子科技大学 | Rectangular waveguide and microstrip transition conversion circuit based on magnetic coupling principle |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2219438A (en) * | 1988-05-28 | 1989-12-06 | Marconi Co Ltd | Coupling transmission lines |
| CN201655932U (en) * | 2010-01-07 | 2010-11-24 | 电子科技大学 | Rectangular waveguide and microstrip transition conversion circuit based on magnetic coupling principle |
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Effective date of registration: 20210113 Address after: No.2006 Xiyuan Avenue, Chengdu, Sichuan 611731 Patentee after: University of Electronic Science and technology of Sichuan foundation for education development Address before: Room 402, area a, Liye building, science and Technology Park, China sensor network university, Taike Park, New District, Wuxi City, Jiangsu Province, 214135 Patentee before: WUXI UESTC TECHNOLOGY DEVELOPMENT Co.,Ltd. |