CN110875508A - Novel stripline-to-coaxial vertical conversion structure - Google Patents
Novel stripline-to-coaxial vertical conversion structure Download PDFInfo
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- CN110875508A CN110875508A CN201911142975.7A CN201911142975A CN110875508A CN 110875508 A CN110875508 A CN 110875508A CN 201911142975 A CN201911142975 A CN 201911142975A CN 110875508 A CN110875508 A CN 110875508A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 36
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 230000009466 transformation Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 13
- 230000007704 transition Effects 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
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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
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/085—Coaxial-line/strip-line transitions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention relates to a novel structure for converting a strip line to a coaxial vertical line, wherein an arched door-shaped strip line is designed at the joint of the strip line and the coaxial line, a coaxial metal needle penetrates through the arched door-shaped strip line and is welded with an upper printed board, an isolation hole with the same diameter as a coaxial metal sheath is formed in a lower printed board, and the size of the arched door-shaped strip line is adjusted to enable the strip line to be converted to the coaxial vertical line in a matching way. 7 metalized through holes are punched on the printed board around the circle center of the coaxial metal needle, the metalized through holes are separated by 45 degrees, the size and the surrounding radius of the metalized through holes are adjusted, and the stable and vertical conversion from the strip line to the coaxial low-loss is realized. The invention has the characteristics of low insertion loss, simple and compact structure, easy processing and the like, and can realize high-efficiency, compact and low-loss feeding of the stripline network to the antenna after the conversion structure is added, thereby improving the overall performance of the array antenna system.
Description
Technical Field
The invention belongs to the technical field of antenna feeders and provides a novel design method for converting a strip line to a coaxial vertical line. The novel structure for converting the strip line to the coaxial vertical conversion structure is applied to a strip line network or a line design, can feed the strip line network or the line design, realizes the high-efficiency and low-loss transmission of radio frequency energy, and has a very simple structure. Thereby improving the overall performance of the antenna system. And is therefore well suited for the design application of stripline networks.
Background
With the rapid development of radio technology, the requirements for antennas are increasing. In addition to the electrical characteristics, the antenna design must also be compatible with the product appearance, and antennas with the advantages of high efficiency, miniaturization and the like are increasingly gaining attention in the market. The striplines have been extensively studied and widely used in the fields of communications and radars, etc. because of their advantages of light weight, small size, low profile, low cost, easy integration, easy processing, etc.
A well-characterized feed network is critical to the performance of the array antenna. The traditional structure for converting a strip line to a coaxial vertical line is complex and has certain loss, and the loss of the traditional structure is increased along with the increase of frequency, so that the overall performance of the antenna is influenced. In view of these disadvantages, the present invention proposes a novel stripline to coaxial vertical conversion design method. The method greatly reduces the vertical conversion loss, and has very simple and compact structure. The novel structure for converting the strip line to the coaxial vertical conversion is applied to a strip line network or a line design, so that the feed can be carried out on the strip line network or the line design, and the high-efficiency and low-loss transmission of radio frequency energy is realized. Thereby improving the overall performance of the antenna system. And is therefore well suited for the design application of stripline networks.
Disclosure of Invention
Technical problem to be solved
In order to achieve vertical feeding to a stripline network, it is necessary to achieve smooth low-loss transmission from the coax to the stripline. Due to the characteristic of the strip line structure, in the traditional structure for converting the strip line into the coaxial vertical conversion structure, the strip line needs to be converted into the microstrip line at the local conversion end, and then the microstrip line is vertically welded with the coaxial line, so that the vertical feed from the coaxial line to the strip line is realized. Therefore, the conversion structure is complex, the strip line-to-microstrip line can cause transmission discontinuity and easily generate resonance points, and although resonance can be eliminated by the local metalized via holes, the exposed microstrip line part of the conversion end can still be affected by the external environment to cause instability and inconsistency of energy transmission. Furthermore, as the frequency increases, the loss due to the conversion also increases, thereby affecting the electrical performance of the stripline network and thus the antenna system as a whole.
In order to solve the above-mentioned defect of the conventional stripline to coaxial vertical conversion, a novel design method of stripline to coaxial vertical conversion is provided. The invention has the characteristics of low insertion loss, simple and compact structure, easy processing and the like, and can realize high-efficiency, compact and low-loss feeding of the stripline network to the antenna after the conversion structure is added, thereby improving the overall performance of the array antenna system.
Technical scheme
A novel structure for converting a strip line into a coaxial vertical line is characterized by comprising an upper printed board and a lower printed board, wherein a rectangular strip line is positioned in the middle layers of the upper printed board and the lower printed board; a metalized through hole with the same diameter as the coaxial metal inner needle is formed in the circle center position of the arched door-shaped strip line, and the metalized through hole penetrates through the arched door-shaped strip line from the upper metal ground of the upper printed board to the lower metal ground of the lower printed board; the lower metal ground of the printed board is provided with an isolation hole with the same diameter as the coaxial metal sheath, the coaxial metal needle passes through the lower printed board and the upper printed board from the metalized through hole and extends out of the upper metal ground of the upper printed board, and the metal needle is welded with the upper metal ground of the upper printed board; adjusting the size of the arched strip line to enable the strip line to be matched with the coaxial vertical conversion; 7 metalized through holes are punched on the upper printed board and the lower printed board around the circle center of the metal needle, the interval between the metalized through holes is 45 degrees, the size and the surrounding radius of the metalized through holes are adjusted, and the stable and vertical conversion from the strip line to the coaxial line with low loss is realized.
Advantageous effects
Compared with the prior art, the novel structure for converting the strip line to the coaxial vertical conversion has the following technical effects:
1. broadband, low loss: the stripline to coax vertical transition model may be equivalent to a two-port circuit model. In order to make the circuit model more matched, the strip line of the arched structure is added, which is equivalent to adding inductance L and capacitance C in the circuit, and the size of the arched structure is properly adjusted, that is, an appropriate L, C value is added in the circuit, so that the whole transmission model has a better matching effect in a wider bandwidth. The stripline to coaxial vertical conversion of the present design has very low loss over a wide operating band. Within the working bandwidth of 40 percent (12GHz-18GHz), the energy loss of the coaxial vertical conversion from the strip line is less than or equal to 0.35 dB.
2. Good consistency and simple structure: compare in traditional conversion mode, this design stripline is very simple to coaxial perpendicular conversion structure, and assembly and welding are easy, can not exert an influence to electrical properties because of assembly and welding error, and external environment does not have an influence to the conversion effect, and the uniformity is very good.
Drawings
FIG. 1 is a side view of a novel stripline to coaxial vertical transition structure
FIG. 2 is a front view of a novel stripline to coaxial vertical transition structure
FIG. 3 is a graph of standing wave versus frequency for a novel stripline to coax vertical transition stripline port
FIG. 4 is a graph of standing wave versus frequency for a novel stripline to coax vertical transition coax port
FIG. 5 is a graph of S-parameter variation with frequency for a novel stripline to coax vertical transition from a coaxial port to a stripline port
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the above purpose of the invention is mainly realized by the following technical scheme:
firstly, aiming at the defect of the traditional stripline to coaxial vertical conversion, the invention realizes the design of low loss, wide frequency band and good consistency through the following structure.
First step, line widthIs W1A rectangular strip line 1 of 1.5mm is positioned in the middle layer of the upper printed board 5 and the lower printed board 6, the thickness of the printed boards is 1mm, and the dielectric constant is er2.94, an arch-shaped strip line 2 is connected at the tail end of the strip line, and the arch-shaped strip line 2 has a size L2×W2Has a rectangular section and a diameter W2Is formed by the semi-circle. A metallized through hole with the same diameter as the coaxial metal inner needle 3 is arranged at the center of the arc-shaped strip line 2, and the diameter D of the metal inner needle 3i1.27mm, the metallized via passes from the upper metal ground of the printed board 5 through the arched strip line 2 to the lower metal ground of the lower printed board 6. The metal inner needle 3 and the metal outer skin 4 together form a coaxial structure. Wherein the length of the whole arched door shape is L1，L1＝L2+W2A metal sheath 4 having a diameter Do。
Secondly, an isolation hole 7 with a diameter D is arranged on the lower metal ground of the lower printed board 6oAnd (4.2 mm), a coaxial metal inner pin 3 penetrates through the upper printed board 5 and the lower printed board 6 from the metalized through hole and extends out to the upper metal ground of the upper printed board 5, and the metal inner pin 3 is welded with the upper metal ground of the upper printed board 5. Using the center of the coaxial metal inner needle 3 as the center of a circle and R as the center of a circlekFor radius, the printed board is punched with 7 circles of diameter D around the conversion structurekThe metalized vias of (1) are spaced 45 degrees apart. The size of the arched strip line 2 can be roughly determined according to the formula: w2≈Do，L2Lambda/4, where lambda is the dielectric wavelength of the stripline, and W is appropriately fine-tuned2And L2To finally obtain W2＝4.0mm，L22.7mm, match the stripline to coaxial vertical transition, adjust D appropriatelykAnd RkTaking the value of Dkλ/8 to obtain Dk＝1.5mm，Rk4.2mm, guarantee the stationarity of energy output, realize the stripline to the steady vertical conversion of coaxial low-loss. Refer to fig. 1.
FIG. 3 is a graph of the variation of the standing wave with frequency from the stripline to the coaxial vertical transition stripline, and the VSWR of the standing wave is less than or equal to 1.5 within the working bandwidth of 40% (12GHz-18 GHz).
FIG. 4 is a graph of standing wave variation with frequency from stripline to coaxial vertical transition, with standing wave VSWR ≦ 1.5 within 40% (12GHz-18GHz) operating bandwidth.
FIG. 5 is a plot of S-parameter versus frequency for stripline to coax vertical transition coaxial port to stripline port transmission with an insertion loss of less than or equal to 0.35dB at a 40% (12GHz-18GHz) operating bandwidth.
According to simulation results, the novel stripline is converted into coaxial vertical conversion, so that the loss is very small in a wide bandwidth, the consistency is good, the structural form is very simple, and the novel stripline has excellent electrical performance and structural compactness.
Claims (1)
1. A novel structure for converting a strip line into a coaxial vertical line is characterized by comprising an upper printed board (5) and a lower printed board (6), wherein a rectangular strip line (1) is positioned in the middle layers of the upper printed board (5) and the lower printed board (6), an arched door-shaped strip line (2) is connected to the tail end of the rectangular strip line (1), and the arched door-shaped strip line (2) consists of a rectangular section and a semicircular part; a metalized through hole with the same diameter as the coaxial metal inner needle (3) is formed in the circle center position of the arched door-shaped strip line (2), and the metalized through hole penetrates through the arched door-shaped strip line (2) from the upper metal of the upper printed board (5) to the lower metal of the lower printed board (6); an isolation hole (7) with the same diameter as that of the coaxial metal sheath (4) is formed in the lower metal ground of the printed board (6), a coaxial metal needle (3) penetrates through the lower printed board (6) and the upper printed board (5) from the metalized through hole and extends out of the upper metal ground of the upper printed board (5), and the metal needle (3) and the upper metal ground of the upper printed board (5) are welded; adjusting the size of the arched strip line (2) to match the coaxial vertical transformation of the strip line; 7 metallized through holes (8) are punched on the upper printed board (5) and the lower printed board (6) around the circle center of the metal needle (3), the interval between the metallized through holes is 45 degrees, the size and the surrounding radius of the metallized through holes are adjusted, and the stable and vertical conversion from a strip line to a coaxial low-loss is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911142975.7A CN110875508A (en) | 2019-11-20 | 2019-11-20 | Novel stripline-to-coaxial vertical conversion structure |
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| CN201911142975.7A CN110875508A (en) | 2019-11-20 | 2019-11-20 | Novel stripline-to-coaxial vertical conversion structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467325A (en) * | 2020-10-30 | 2021-03-09 | 锐石创芯（深圳）科技有限公司 | Radio frequency substrate and coaxial microstrip conversion structure |
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| CN205752537U (en) * | 2016-06-29 | 2016-11-30 | 吉林医药学院 | A kind of ultra broadband arch door shape planographic monopole antenna |
| CN107369895A (en) * | 2017-06-26 | 2017-11-21 | 西安电子科技大学 | One kind orientation high-gain microstrip antenna |
| CN107565225A (en) * | 2017-07-18 | 2018-01-09 | 东南大学 | A kind of array antenna structure and multilayer via structure |
| CN107634325A (en) * | 2017-08-23 | 2018-01-26 | 西安电子工程研究所 | A kind of new S/C two wavebands communication array antenna |
| CN210926267U (en) * | 2019-11-20 | 2020-07-03 | 西安电子工程研究所 | Novel stripline-to-coaxial vertical conversion structure |
-
2019
- 2019-11-20 CN CN201911142975.7A patent/CN110875508A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205752537U (en) * | 2016-06-29 | 2016-11-30 | 吉林医药学院 | A kind of ultra broadband arch door shape planographic monopole antenna |
| CN107369895A (en) * | 2017-06-26 | 2017-11-21 | 西安电子科技大学 | One kind orientation high-gain microstrip antenna |
| CN107565225A (en) * | 2017-07-18 | 2018-01-09 | 东南大学 | A kind of array antenna structure and multilayer via structure |
| CN107634325A (en) * | 2017-08-23 | 2018-01-26 | 西安电子工程研究所 | A kind of new S/C two wavebands communication array antenna |
| CN210926267U (en) * | 2019-11-20 | 2020-07-03 | 西安电子工程研究所 | Novel stripline-to-coaxial vertical conversion structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467325A (en) * | 2020-10-30 | 2021-03-09 | 锐石创芯（深圳）科技有限公司 | Radio frequency substrate and coaxial microstrip conversion structure |
| CN112467325B (en) * | 2020-10-30 | 2021-08-17 | 锐石创芯（深圳）科技有限公司 | Radio frequency substrate and coaxial microstrip conversion structure |
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