CN114400128A - Planar spiral inductor - Google Patents
Planar spiral inductor Download PDFInfo
- Publication number
- CN114400128A CN114400128A CN202111614557.0A CN202111614557A CN114400128A CN 114400128 A CN114400128 A CN 114400128A CN 202111614557 A CN202111614557 A CN 202111614557A CN 114400128 A CN114400128 A CN 114400128A
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- arm
- feed
- spiral
- spiral inductor
- ceramic dielectric
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- 239000000919 ceramic Substances 0.000 claims abstract description 45
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 12
- 230000005284 excitation Effects 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 229910052573 porcelain Inorganic materials 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 239000003989 dielectric material Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 229910010293 ceramic material Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F2017/004—Printed inductances with the coil helically wound around an axis without a core
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention provides a planar spiral inductor, which belongs to the technical field of basic electronic elements and comprises a spiral inductor arm, an inter-arm ceramic medium, a ceramic medium substrate, a printed circuit board, a first feed input end, a second feed input end, a feed end and a feed arm, wherein the spiral inductor arm is connected with the feed end through a first feed input end; FR4 is selected as the material of the printed circuit board, the printed circuit board is used as a bottom plate, a ceramic dielectric substrate is built on the printed circuit board, the spiral inductance arms and the ceramic dielectric between the arms are spirally built on the ceramic dielectric substrate and are arranged at intervals, and the circle at the innermost side is the spiral inductance arm; the two ends of the second feed input end are respectively connected with the end part of the outermost spiral inductance arm and the feed end, the innermost spiral inductance arm extends towards one side of the printed circuit board and is connected to the feed end through the feed arm and the first feed input end; the feed end provides excitation for the spiral inductance arm, and the two ends of the feed arm are respectively connected with the feed end and the spiral inductance arm. The invention has the advantage that the inductance value is obviously improved under the condition of not changing the size of the coil.
Description
Technical Field
The invention relates to the technical field of basic electronic elements, in particular to a planar spiral inductor.
Background
In recent years, with the rapid development of information technology, there has been a demand for miniaturization, integration, and the like of electronic devices. A printed circuit board is typically populated with a large number of discrete components such as capacitors, resistors, and inductors. Compared with integrated chips and modules, the discrete passive components occupy most of the area of the printed circuit board, so that the miniaturization and planarization of the discrete passive components are key to the miniaturization and integration of electronic equipment, and the miniaturization and integration can reduce the interference among the components, reduce the loss and improve the circuit performance.
Inductance has a greater impact on the weight and volume of the printed circuit board than capacitance and resistance. The existing planar spiral inductor adopts a structure that an inductor winding is arranged on a substrate, so that the process is simple, but the inductance value is low. A simulation model of an existing planar spiral inductor is shown in fig. 1, and includes a spiral inductor arm 2, a printed circuit board 5, a first feed input end 6, a second feed input end 7, a feed arm 9, and a feed end 8, a circuit model is constructed and analyzed in a simulation space 1 by taking a square spiral structure as an example, and an analysis result is shown in fig. 2. The maximum inductance value is 3.2 multiplied by 10 within the range of DC-10 GHz-9H。
To further improve circuit performance, a method for increasing inductance without changing the size of the inductor and without significantly increasing process complexity is continuously sought.
Disclosure of Invention
The invention provides a planar spiral inductor, aiming to increase the inductance value without changing the structural size of the planar spiral inductor.
A planar spiral inductor is characterized by comprising spiral inductor arms, ceramic dielectrics between the arms, a ceramic dielectric substrate, a printed circuit board, a first feed input end, a second feed input end, a feed end and a feed arm; the material of the printed circuit board selects FR4, the external dimension is larger than or equal to the maximum peripheral dimension of the spiral inductance arm, the printed circuit board is used as a bottom plate, a ceramic dielectric substrate is built on the printed circuit board, the spiral inductance arm and the ceramic dielectric between the arms are built on the ceramic dielectric substrate, the ceramic dielectric between the arms is filled between adjacent inductance windings of the spiral inductance arm, and the innermost circle is the spiral inductance arm; the two ends of the second feed input end are respectively connected with the end part of the outermost spiral inductance arm and the feed end, the innermost spiral inductance arm is connected with the feed arm, extends to one side of the printed circuit board, penetrates through the ceramic dielectric substrate and is connected to the feed end through the first feed input end; the second feed input end and the first feed input end are isolated in an insulation mode; the feed end provides excitation for the spiral inductance arm, and two ends of the feed arm are respectively connected with the first feed input end and the innermost spiral inductance arm.
Further, the spiral inductance arm is made of copper.
Further, the material of the feed end is copper.
Further, the material of the ceramic medium between the arms adopts 99 porcelain.
Further, the ceramic dielectric substrate is made of 99 ceramics.
Further, the spiral inductance arm adopts a square spiral structure.
Further, the line width of the spiral inductance arm is 0.02032mm, the thickness is 0.035mm, the distance between adjacent lines is 0.02032mm, and the length of the outermost circle is 0.4267 mm.
Further, the thickness of the ceramic dielectric between the arms is 0.035 mm.
Further, the thickness of the ceramic dielectric substrate is 0.05 mm.
Further, the thickness of the printed circuit board was 0.09 mm.
The beneficial technical effects obtained by the invention are as follows:
compared with the prior art, the inductance value is obviously improved under the condition of not changing the size of the coil. The purpose of increasing the inductance value under the condition of not changing the size of the planar spiral inductor structure is achieved. And the complexity is not obviously increased in the aspect of process realizability, and the filled material is a commonly used ceramic material at present, so that the cost is not obviously increased. The inductor has no special requirements on the shape and the size of the inductor coil, can be popularized to inductor designs with other sizes and plane shapes, and has wide applicability.
Drawings
FIG. 1 is a simulation model of a typical planar spiral inductor in the prior art;
FIG. 2 is a result of an inductance value analysis of the simulation model of FIG. 1;
FIG. 3 is a simulation model of one embodiment of the planar spiral inductor of the present invention;
FIG. 4 is an isometric view of FIG. 3 from another perspective;
FIG. 5 shows the results of an inductance value analysis of the simulation model of FIG. 3;
reference numerals: 1. a simulation space; 2. a spiral inductor arm; 3. ceramic dielectric between the arms; 5. a printed circuit board; 6. a first feed input; 7. a second feed input; 8. a feed end; 9. a feed arm; 14. a ceramic dielectric substrate.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and specific details such as specific system configurations, model numbers, technical parameters, etc., set forth in the following description are set forth merely to provide a better understanding of the present invention, and are not intended to limit the scope of the invention. In addition, those that should be known and understood by those skilled in the art will not be described in detail herein.
When alternating current passes through the coil, partial current flows to the substrate through the parasitic capacitance in the form of displacement current, and from the loss mechanism of the inductor, the loss of a metal conductor and the loss of the substrate exist, and the skin effect and the proximity effect exist at the same time, which increase the loss of electromagnetic energy in space and materials and are not beneficial to energy application.
Aiming at an FR4 printed board commonly used in circuit design, a planar spiral inductor is manufactured on the surface of the printed board, the inductance can be increased by reducing the size of the inductor according to analysis of a related electromagnetic field and a circuit theory, however, the size reduction has a certain limit due to the limitation of process conditions, when the size of the inductor can not be reduced, a ceramic material can be additionally arranged between the inductor and a medium substrate to serve as a medium substrate, and meanwhile, the same type of ceramic medium material is also filled between adjacent windings of the inductor, so that the inductance can be increased.
As shown in fig. 3 to 4, based on the above analysis, a specific embodiment of a planar spiral inductor is proposed, which includes a spiral inductor arm 2, an inter-arm ceramic dielectric 3, a ceramic dielectric substrate 14, a printed circuit board 5, a first feeding input end 6, a second feeding input end 7, a feeding end 8, and a feeding arm 9.
The shape and size of the planar spiral inductor have no requirement, and the planar spiral inductor can be of a square spiral structure, a circular spiral structure, an oval or polygonal spiral structure and other forms of spiral structures.
The spiral inductance arm 2 in fig. 3 adopts a square spiral structure, the line width is 0.02032mm, the thickness is 0.035mm, the distance between adjacent lines is 0.02032mm, the length of the outermost circle is 0.4267mm, the material is selected to be copper (copper), and 3 circles are wound.
In this embodiment, the inter-arm ceramic dielectric 3 is filled between adjacent inductor windings of the spiral inductor arm 2 and has a thickness of 0.035 mm. The ceramic medium 3 between the arms is made of currently widely used 99 ceramics, and has a relative dielectric constant of 9.8. 96-porcelain or other grades of ceramic material may also be used, with 99-porcelain having a higher relative dielectric constant.
In the embodiment, the ceramic dielectric substrate (14) is arranged between the spiral inductance arm (2) and the printed circuit board (5) and has the thickness of 0.05 mm. The ceramic dielectric substrate 14 is made of 99 porcelain. 96-ceramic or other grades of ceramic material may also be used, with the advantage of selecting 99 ceramic being a higher relative dielectric constant.
The material of the feeding terminal 8 in this embodiment is selected to be copper (copper).
In this embodiment, the printed circuit board 5 is made of FR4 with a thickness of 0.09mm and a side length greater than or equal to the length of the outermost turn of the spiral inductor arm 2.
The printed circuit board 5 is used as a bottom plate, a ceramic dielectric substrate 14 is built on the printed circuit board 5, the spiral inductance arm 2 and the ceramic dielectric 3 between the arms are spirally built on the ceramic dielectric substrate 14 and are arranged at intervals, and the innermost circle is the spiral inductance arm 2.
And two ends of the second feed input end 7 are respectively connected with the end part of the outermost spiral inductance arm 2 and the feed end 8. The innermost spiral inductor arm 2 extends downwards and is connected to the feed terminal 8 through the first feed input terminal 6 after passing through the ceramic dielectric substrate 14. The feed terminal 8 provides excitation for the spiral inductor arm 2. The two ends of the feed arm 9 are respectively connected with the first feed input end 6 and the innermost spiral inductor arm 2.
Constructing a circuit model in the simulation space 1 according to the parametersAnd analysis is carried out, the model is excited by using a lumped port, the port impedance is 50 omega, and the analysis result is shown in fig. 5. The maximum inductance value is 5 multiplied by 10 within the range of DC-10 GHz-8H。
The beneficial technical effects obtained by the specific embodiment are as follows:
compared with the prior art, under the condition of not changing the size of the coil, the inductance value is improved by 14.625 times under the same size in the range of DC-10 GHz, and the inductance value is obviously increased. The purpose of increasing the inductance value under the condition of not changing the size of the planar spiral inductor structure is achieved.
From the aspect of realizability, compared with the prior art, the complexity is not obviously increased in the aspect of process realizability, and the filled material is the ceramic material commonly used at present, so that the cost is not obviously increased.
The inductor has no special requirements on the shape and the size of the inductor coil, can be popularized to inductor designs with other sizes and plane shapes, and has wide applicability.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A planar spiral inductor is characterized by comprising spiral inductor arms (2), inter-arm ceramic dielectrics (3), a ceramic dielectric substrate (14), a printed circuit board (5), a first feed input end (6), a second feed input end (7), a feed end (8) and a feed arm (9);
the printed circuit board (5) is made of FR4, the overall dimension is larger than or equal to the maximum peripheral dimension of the spiral inductance arm (2), the printed circuit board (5) is used as a bottom plate, a ceramic dielectric substrate (14) is built on the printed circuit board (5), the spiral inductance arm (2) and the ceramic dielectric (3) between the arms are built on the ceramic dielectric substrate (14), the ceramic dielectric (3) between the arms is filled between adjacent inductance windings of the spiral inductance arm (2), and the innermost circle is the spiral inductance arm (2);
the two ends of the second feed input end (7) are respectively connected with the end part of the outermost ring spiral inductance arm (2) and the feed end (8), the innermost ring spiral inductance arm (2) is connected with the feed arm (9), extends towards one side of the printed circuit board (5), penetrates through the ceramic dielectric substrate (14), and is connected to the feed end (8) through the first feed input end (6); the second feed input end (7) and the first feed input end (6) are isolated;
the feed end (8) provides excitation for the spiral inductance arm (2), and two ends of the feed arm (9) are respectively connected with the first feed input end (6) and the innermost spiral inductance arm (2).
2. The planar spiral inductor according to claim 1, wherein the material of the spiral inductor arm (2) is copper.
3. The planar spiral inductor according to claim 1, wherein the material of the feeding terminal (8) is copper.
4. The planar spiral inductor according to claim 1, wherein the inter-arm ceramic dielectric (3) is made of 99-porcelain.
5. The planar spiral inductor of claim 1, wherein the ceramic dielectric substrate (14) is made of 99-ceramic.
6. The planar spiral inductor as claimed in any one of claims 1 to 5, wherein the spiral inductor arm (2) has a square spiral structure.
7. The planar spiral inductor according to claim 6, wherein the spiral inductor arm (2) has a line width of 0.02032mm, a thickness of 0.035mm, a distance between adjacent lines of 0.02032mm, and an outermost turn length of 0.4267 mm.
8. The planar spiral inductor according to claim 7, wherein the thickness of the ceramic dielectric (3) between the arms is 0.035 mm.
9. The planar spiral inductor of claim 8, wherein the ceramic dielectric substrate (14) has a thickness of 0.05 mm.
10. The planar spiral inductor according to claim 9, wherein the thickness of the printed circuit board (5) is 0.09 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111614557.0A CN114400128A (en) | 2021-12-27 | 2021-12-27 | Planar spiral inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111614557.0A CN114400128A (en) | 2021-12-27 | 2021-12-27 | Planar spiral inductor |
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| Publication Number | Publication Date |
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| CN114400128A true CN114400128A (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111614557.0A Pending CN114400128A (en) | 2021-12-27 | 2021-12-27 | Planar spiral inductor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5793272A (en) * | 1996-08-23 | 1998-08-11 | International Business Machines Corporation | Integrated circuit toroidal inductor |
| US6175727B1 (en) * | 1998-01-09 | 2001-01-16 | Texas Instruments Israel Ltd. | Suspended printed inductor and LC-type filter constructed therefrom |
| CN101184359A (en) * | 2007-12-07 | 2008-05-21 | 华东师范大学 | Low power microwave plasma source |
| CN108063607A (en) * | 2017-12-11 | 2018-05-22 | 北京北广科技股份有限公司 | A kind of micro high-power ceramic substrate wave filter |
| CN109378588A (en) * | 2018-11-21 | 2019-02-22 | 常熟正昊电子科技有限公司 | A kind of miniaturization ceramic base band planar helical antenna |
| CN113782673A (en) * | 2021-09-10 | 2021-12-10 | 中国科学院微电子研究所 | Planar spiral inductor and corresponding broadband radio frequency power amplifier internal matching circuit |
-
2021
- 2021-12-27 CN CN202111614557.0A patent/CN114400128A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5793272A (en) * | 1996-08-23 | 1998-08-11 | International Business Machines Corporation | Integrated circuit toroidal inductor |
| US6175727B1 (en) * | 1998-01-09 | 2001-01-16 | Texas Instruments Israel Ltd. | Suspended printed inductor and LC-type filter constructed therefrom |
| CN101184359A (en) * | 2007-12-07 | 2008-05-21 | 华东师范大学 | Low power microwave plasma source |
| CN108063607A (en) * | 2017-12-11 | 2018-05-22 | 北京北广科技股份有限公司 | A kind of micro high-power ceramic substrate wave filter |
| CN109378588A (en) * | 2018-11-21 | 2019-02-22 | 常熟正昊电子科技有限公司 | A kind of miniaturization ceramic base band planar helical antenna |
| CN113782673A (en) * | 2021-09-10 | 2021-12-10 | 中国科学院微电子研究所 | Planar spiral inductor and corresponding broadband radio frequency power amplifier internal matching circuit |
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