CN113381153A - Slow-wave slot line transmission line - Google Patents
Slow-wave slot line transmission line Download PDFInfo
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- CN113381153A CN113381153A CN202110699135.1A CN202110699135A CN113381153A CN 113381153 A CN113381153 A CN 113381153A CN 202110699135 A CN202110699135 A CN 202110699135A CN 113381153 A CN113381153 A CN 113381153A
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- slot
- metal layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/023—Fin lines; Slot lines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/08—Microstrips; Strip lines
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Abstract
The invention discloses a slow-wave slot line transmission line, which consists of a dielectric slab and a metal layer positioned on one side surface of the dielectric slab, wherein the metal layer is provided with a slot so as to expose the dielectric slab; the open groove is a linear groove and leads to the other end from one end of the metal layer; a plurality of periodic groove line short circuit branches which are parallel at intervals are formed on one side of the metal layer in the length direction of the groove, and the groove line short circuit branches are communicated with and vertical to the groove; and a periodic bent slot line is formed between two adjacent slot line short circuit branches and is communicated with the open slot through two ends. The slow wave slot line transmission line can generate a slow wave effect by periodically loading on the uniform slot line.
Description
Technical Field
The invention relates to the technical field of radio frequency microwave circuits, in particular to a slow wave slot line transmission line.
Background
A slot line is a form of transmission line commonly used in rf microwave circuits, the main structure of which includes a dielectric substrate and a slot or gap in a metal layer on one side, while the metal on the other side is usually bare. A slot line is a planar form of microwave transmission line whose electric field crosses the slot and whose magnetic field is perpendicular to the slot. The slot line is used as a transmission line, and when the working frequency is low, the circuit area and the circuit size of the radio frequency module formed by the slot line are large due to the fact that the guided wave wavelength is large. The slow wave transmission line is a periodic transmission line structure, and a certain structure is loaded on a uniform transmission line periodically, so that the slow wave effect is realized. The slow-wave transmission line can increase the propagation constant of the transmission line, so that under the condition that the electrical length is unchanged, namely the phase delay is unchanged, compared with a uniform transmission line, the slow-wave transmission line has a smaller physical length, and the circuit area can be reduced. However, there are few reports and studies related to the structure of the slow wave transmission line of the slot line.
Disclosure of Invention
The invention aims to provide a slow-wave slot line transmission line loaded with a microstrip open-circuit branch or a slot line short-circuit branch or a loaded slot line short-circuit branch and a bent slot line cascade aiming at the technical defects in the prior art.
The first technical scheme of the invention is as follows: a slow-wave slot line transmission line is composed of a dielectric slab, a first metal layer and a second metal layer, wherein the first metal layer is positioned on one side surface of the dielectric slab, the second metal layer is positioned on the other side surface of the dielectric slab, a slot is formed in the first metal layer, the dielectric slab is exposed, and the slot is a linear slot and leads to the other end from one end of the first metal layer; the second metal layer is formed by attaching a micro-strip branch line to the surface of the dielectric slab, the micro-strip branch line is formed by arranging a plurality of metal strips at intervals periodically, the groove is transversely arranged, and the micro-strip branch line is longitudinally arranged.
The second technical scheme of the invention is as follows: a slow-wave slot line transmission line is composed of a dielectric plate and a metal layer located on one side face of the dielectric plate, wherein a slot is formed in the metal layer to expose the dielectric plate, and the slot is a linear slot and leads to the other end from one end of the metal layer; the metal layer symmetrically forms a plurality of periodic slot line short circuit branch sections on two sides of the length direction of the slot, and the slot line short circuit branch sections are communicated with and vertical to the slot.
The third technical scheme of the invention is as follows: a slow-wave slot line transmission line is composed of a dielectric plate and a metal layer located on one side face of the dielectric plate, wherein a slot is formed in the metal layer to expose the dielectric plate, and the slot is a linear slot and leads to the other end from one end of the metal layer; a plurality of periodic groove line short circuit branches which are parallel at intervals are formed on one side of the metal layer in the length direction of the groove, and the groove line short circuit branches are communicated with and vertical to the groove; and a periodic bent slot line is formed between two adjacent slot line short circuit branches and is communicated with the open slot through two ends.
The slow wave slot line transmission line can generate a slow wave effect by periodically loading on the uniform slot line. Under the condition that the properties of the medium substrate are fixed, compared with the existing uniform slot line structure, the slow-wave slot line has the characteristic of large propagation constant; under the condition of equal phase delay, the slow wave slot line has smaller physical length compared with the existing uniform slot line, and the area and the size of a corresponding circuit module can be reduced.
Drawings
FIG. 1 is a cross-sectional view of a slow-wave slot line structure loaded with microstrip open stubs according to an embodiment of the present invention;
FIG. 2 is a plan view of a metal layer on the upper surface of a slow-wave slot line structure loaded with microstrip open branches according to an embodiment of the present invention;
FIG. 3 is a metal top view of the lower surface of the slow-wave slot line structure loaded with the microstrip open-circuit stubs according to the embodiment of the present invention;
FIG. 4 is a three-dimensional view of a slow-wave slot line structure loaded with microstrip open stubs according to an embodiment of the present invention;
FIG. 5 is a three-dimensional view of a slow wave slot line structure of a loaded slot line short circuit stub according to an embodiment of the present invention;
FIG. 6 is a top metal view of the upper surface of a slow wave slot line structure of a loaded slot line short stub according to an embodiment of the present invention;
FIG. 7 is a three-dimensional view of the structure of a slow wave slot line in cascade connection with a loading slot line short-circuit stub and a meander slot line according to an embodiment of the present invention;
fig. 8 is a top metal view of the upper surface of a slow-wave slot line structure in which loading slot line short-circuiting branches and bending slot lines are cascaded according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 4, a slow-wave slot line transmission line according to a first embodiment of the present invention includes a dielectric slab 2, a metal layer 1 on one side surface of the dielectric slab, and another metal layer 3 on the other side surface of the dielectric slab, where the metal layer 1 is formed with a slot 11 to expose the dielectric slab, and the slot is a linear slot and leads from one end of the metal layer 1 to the other end; the other metal layer is formed by attaching a micro-strip branch line to the surface of the dielectric slab, the micro-strip branch line is formed by arranging a plurality of metal strips at intervals periodically, the groove is transversely arranged, and the micro-strip branch line is longitudinally arranged.
Wherein, the metal layer 1 and the other metal layer 3 are copper layers.
Referring to fig. 5 to 6, a slow-wave slot line transmission line according to a second embodiment of the present invention includes a dielectric plate 2 and a metal layer 1 on one side of the dielectric plate, where a slot is formed in the metal layer to expose the dielectric plate, and the slot is a linear slot passing from one end of the metal layer to the other end; the metal layer 1 symmetrically forms a plurality of periodic slot line short circuit branch sections 12 at two sides of the length direction of the slot 11, and the slot line short circuit branch sections 12 are communicated with and perpendicular to the slot 11.
The slot line short circuit branch section 12 is a linear slot, and the metal layer is a copper layer.
Referring to fig. 7-8, a third embodiment of the present invention is: a slow-wave slot line transmission line is composed of a dielectric plate 2 and a metal layer 1 positioned on one side surface of the dielectric plate 2, wherein a slot is formed in the metal layer to expose the dielectric plate, and the slot is a linear slot and leads to the other end from one end of the metal layer; a plurality of periodic slot line short circuit branches 12 which are parallel at intervals are formed on one side of the metal layer 1 in the length direction of the slot 11, and the slot line short circuit branches are communicated with and vertical to the slot; and a periodic bent slot line 13 is formed between two adjacent slot line short circuit branches 12, and the bent slot line 13 is communicated with the slot 11 through two ends.
The metal layer is a copper layer, the slot line short circuit branch section is a linear slot, and the bent slot line is of a U-shaped structure.
The dielectric substrate used in the above three embodiments can be the same, for example, the dielectric substrate used has a dielectric constant of 10.2, a thickness of 0.635 mm, a width of 0.3 mm, and a length of 10 mm.
Taking the slow-wave slot line structure of the loading slot line short-circuit branch as an example, as shown in fig. 5 and 6. When no periodic slot line shorting stubs are loaded, the phase delay is 156 degrees for this length of uniform slot line. When the periodical slot line short-circuit branches are loaded, the length of the short-circuit branches is 3 mm, the width of the short-circuit branches is 0.2 mm, the interval is 0.2 mm, the period number is 10, and the phase delay of the slow-wave slot line with the length is 250 degrees. It can therefore be concluded that: when the slot line transmission line with the same electrical length is needed, the physical length of the slow wave slot line is 62.4% of that of the traditional uniform slot line, namely, the physical size of the circuit can be reduced, and the purpose of circuit miniaturization is achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. The slow-wave slot line transmission line is characterized by comprising a dielectric slab, a first metal layer and a second metal layer, wherein the first metal layer is positioned on one side surface of the dielectric slab, the second metal layer is positioned on the other side surface of the dielectric slab, and the first metal layer is provided with a slot so that the dielectric slab is exposed; the open groove is a linear groove and leads to the other end from one end of the first metal layer; the second metal layer is formed by attaching a micro-strip branch line to the surface of the dielectric slab, the micro-strip branch line is formed by arranging a plurality of metal strips at intervals periodically, the groove is transversely arranged, and the micro-strip branch line is longitudinally arranged.
2. The slow-wave slot line transmission line is characterized by comprising a dielectric plate and a metal layer positioned on one side surface of the dielectric plate, wherein the metal layer is provided with a slot to expose the dielectric plate; the open groove is a linear groove and leads to the other end from one end of the metal layer; the metal layer symmetrically forms a plurality of periodic slot line short circuit branch sections on two sides of the length direction of the slot, and the slot line short circuit branch sections are communicated with and vertical to the slot.
3. The slow-wave slot line transmission line is characterized by comprising a dielectric plate and a metal layer positioned on one side surface of the dielectric plate, wherein the metal layer is provided with a slot to expose the dielectric plate; the open groove is a linear groove and leads to the other end from one end of the metal layer; a plurality of periodic groove line short circuit branches which are parallel at intervals are formed on one side of the metal layer in the length direction of the groove, and the groove line short circuit branches are communicated with and vertical to the groove; and a periodic bent slot line is formed between two adjacent slot line short circuit branches and is communicated with the open slot through two ends.
4. The slow wave slot line transmission line of claim 3, wherein the meander slot line is a U-shaped structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110699135.1A CN113381153B (en) | 2021-06-23 | 2021-06-23 | Slow-wave slot line transmission line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110699135.1A CN113381153B (en) | 2021-06-23 | 2021-06-23 | Slow-wave slot line transmission line |
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| CN113381153A true CN113381153A (en) | 2021-09-10 |
| CN113381153B CN113381153B (en) | 2022-04-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395197A (en) * | 2022-08-25 | 2022-11-25 | 天津大学 | Slow wave transmission line structure based on dielectric integrated suspension parallel strip line |
| CN116960585A (en) * | 2023-09-18 | 2023-10-27 | 深圳大学 | Liquid crystal phase shifter based on slow wave |
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| CN102306599A (en) * | 2011-08-11 | 2012-01-04 | 电子科技大学 | Curved ridge-loading rectangular slot waveguide slow wave line |
| TW201212373A (en) * | 2010-09-01 | 2012-03-16 | Univ Nat Taiwan | Transmission line structure |
| CN104362419A (en) * | 2014-11-28 | 2015-02-18 | 桂林电子科技大学 | Ultra-wideband (UWB) manual surface plasmonpolariton bend waveguide |
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| CN105261841A (en) * | 2015-09-16 | 2016-01-20 | 东南大学 | Quasi-surface plasmon-based leaky-wave antenna |
| CN105428189A (en) * | 2016-01-04 | 2016-03-23 | 电子科技大学 | Slow wave structure of coplanar waveguide |
| CN111261983A (en) * | 2020-01-16 | 2020-06-09 | 北京环境特性研究所 | Closed periodic metal grating SSP terahertz filter and tuning method |
-
2021
- 2021-06-23 CN CN202110699135.1A patent/CN113381153B/en active Active
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| TW201212373A (en) * | 2010-09-01 | 2012-03-16 | Univ Nat Taiwan | Transmission line structure |
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| KR20150025706A (en) * | 2013-08-30 | 2015-03-11 | 한국과학기술원 | Structure of a slow-wave microstrip line with high Q factor and a shorter wavelength |
| CN104362419A (en) * | 2014-11-28 | 2015-02-18 | 桂林电子科技大学 | Ultra-wideband (UWB) manual surface plasmonpolariton bend waveguide |
| CN104852119A (en) * | 2015-04-07 | 2015-08-19 | 上海大学 | Compact broadband slow wave system based on double curved-groove metal grating structures |
| CN105261841A (en) * | 2015-09-16 | 2016-01-20 | 东南大学 | Quasi-surface plasmon-based leaky-wave antenna |
| CN105428189A (en) * | 2016-01-04 | 2016-03-23 | 电子科技大学 | Slow wave structure of coplanar waveguide |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395197A (en) * | 2022-08-25 | 2022-11-25 | 天津大学 | Slow wave transmission line structure based on dielectric integrated suspension parallel strip line |
| CN115395197B (en) * | 2022-08-25 | 2024-03-01 | 天津大学 | Slow wave transmission line structure based on medium integrated suspension parallel strip line |
| CN116960585A (en) * | 2023-09-18 | 2023-10-27 | 深圳大学 | Liquid crystal phase shifter based on slow wave |
| CN116960585B (en) * | 2023-09-18 | 2023-12-29 | 深圳大学 | Liquid crystal phase shifter based on slow wave |
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| CN113381153B (en) | 2022-04-05 |
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Effective date of registration: 20220617 Address after: 300457 No. 12, Taihua Road, the Fifth Street, Binhai New Area Development Zone, Tianjin Patentee after: Tianda Science Park Co.,Ltd. Address before: 300072 Tianjin City, Nankai District Wei Jin Road No. 92 Patentee before: Tianjin University |
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Effective date of registration: 20220706 Address after: 300000 industrial incubation-5-428, North 2-204, No. 18, Haitai West Road, Huayuan Industrial Zone, Binhai New Area, Tianjin Patentee after: Tianjin Tianxin microsystem Integration Research Institute Co.,Ltd. Address before: 300457 No. 12, Taihua Road, the Fifth Street, Binhai New Area Development Zone, Tianjin Patentee before: Tianda Science Park Co.,Ltd. |
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