Planar spiral inductor

Abstract

The utility model provides a planar spiral inductor, and relates to the technical field of inductors. The planar spiral inductor comprises an inductor body, an inductor arm, a bottom plate assembly and a feed assembly. The inductor body is provided with a groove with an opening in one end, the bottom plate assembly is arranged on the bottom wall, opposite to the opening, of the groove, the inductor arms are arranged on the side wall of the groove with the circumferential direction of the groove as the spiral direction, a gap is formed between every two adjacent circles of inductor arms, and the gaps are filled with media. The dielectric is a material with the relative dielectric constant of 8-12, the relative conductivity of 0.8-1.2 and the dielectric loss tangent value of 0; the feed assembly is connected with the inductance arm and used for exciting the inductance arm. According to the planar spiral inductor, the gap between every two adjacent circles of inductance arms is filled with the medium, the inductance value can be remarkably improved under the condition that the size of the inductance coil is not changed, the manufacturing mode of the planar spiral inductor is simple, materials selected by the medium are easy to obtain, and the planar spiral inductor is high in applicability and practicability.

Description

Technical Field

[0001] The present specification relates to the technical field of inductors, and in particular to a planar spiral inductor. Background Art

[0002] In recent years, with the rapid development of information technology, higher requirements have been put forward for the miniaturization and integration of electronic equipment. Usually, a large number of discrete components such as capacitors, resistors and inductors are distributed on printed circuit boards. Compared with integrated chips and modules, these discrete passive components occupy most of the area of ​​​​the printed circuit board. Therefore, their miniaturization and planarization are the key to solving the miniaturization and integration of electronic equipment. At the same time, this miniaturization and integration can reduce interference between components, reduce losses, and improve circuit performance.

[0003] Compared with capacitance and resistance, inductance has a greater impact on the weight and volume of printed circuit boards. The existing planar spiral inductor adopts a structure in which an inductor winding is arranged on a substrate. The process is simple, but the inductance value is low. The simulation model of the existing planar spiral inductor is as follows: Figure 1 As shown, it includes a spiral inductor arm, a printed circuit board, a first feeding input terminal, a second feeding input terminal, a feeding arm and a feeding terminal. Taking the square spiral structure as an example, a circuit model is constructed in the simulation space and analyzed. The analysis results are shown in FIG. Figure 2 As shown, in the range of DC to 10GHz, the maximum inductance value is 3.2×10 -9 H. Utility Model Content

[0004] The purpose of this specification is to provide a planar spiral inductor, which can solve the problem of difficulty in increasing the inductance value without changing the size structure of the spiral inductor.

[0005] The embodiments of this specification are implemented as follows:

[0006] A planar spiral inductor comprises an inductor body, an inductor arm, a bottom plate component and a feeding component;

[0007] The inductor body is provided with a groove with an opening at one end, the bottom plate component is arranged on the bottom wall of the groove opposite to the opening, the inductor arm is arranged on the side wall of the groove with the circumference of the groove as the spiral direction, and there is a gap between two adjacent circles of the inductor arm, and the gap is filled with a medium, and the medium is a material with a relative dielectric constant of 8-12, a relative conductivity of 0.8-1.2, and a dielectric loss tangent value of 0; the feeding component is connected to the inductor arm for exciting the inductor arm.

[0008] The embodiments of this specification have at least the following advantages or beneficial effects:

[0009] Compared with the prior art, the planar spiral inductor can significantly improve the inductance value without changing the size of the inductor coil by filling the gap between two adjacent turns of the inductor arms with a dielectric material having a relative dielectric constant of 8-12, a relative conductivity of 0.8-1.2, and a dielectric loss tangent of 0. Moreover, the planar spiral inductor is simple to manufacture, and the material used for the dielectric is easy to obtain, so it has strong applicability and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present specification and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 It is a schematic diagram of the structure of an existing planar spiral inductor;

[0012] Figure 2 The figure is the inductance analysis result of the existing planar spiral inductor;

[0013] Figure 3 A schematic diagram of the structure of a planar spiral inductor provided in this specification;

[0014] Figure 4 A top view of the planar spiral inductor provided for this specification;

[0015] Figure 5 This is a graph showing the inductance analysis results of the planar spiral inductor provided in this manual.

[0016] Icons: 1. Inductor body; 2. Inductor arm; 3. Dielectric; 5. Printed circuit board; 6. First feeding input terminal; 7. Second feeding input terminal; 8. Feeding terminal; 9. Feeding arm; 10. Substrate. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of this specification more clear, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are part of the embodiments of this specification, not all of the embodiments. Generally, the components of the embodiments of this specification described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present specification provided in the accompanying drawings is not intended to limit the scope of the present specification claimed for protection, but merely represents selected embodiments of the present specification. Based on the embodiments in the present specification, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present specification.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0020] In the description of the embodiments of this specification, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of this specification is usually placed when used. It is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this specification. In addition, if the terms "first", "second", "third", etc. appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0021] In addition, the use of terms such as "horizontal", "vertical", and "overhanging" does not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of the embodiments of this specification, it is also necessary to explain that, unless otherwise clearly specified and limited, the words "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this specification can be understood according to specific circumstances.

[0023] Please refer to Figure 3-Figure 4 , a planar spiral inductor provided in an embodiment of the present specification includes an inductor body 1, an inductor arm 2, a bottom plate component and a feeding component;

[0024] The inductor body 1 is provided with a groove with an opening at one end, the bottom plate assembly is provided on the bottom wall of the groove opposite to the opening, the inductor arm 2 is provided on the side wall of the groove with the circumference of the groove as the spiral direction, and there is a gap between two adjacent circles of the inductor arm 2, and the gap is filled with a medium 3, and the medium 3 is a material with a relative dielectric constant of 8-12, a relative conductivity of 0.8-1.2, and a loss tangent value of 0;

[0025] The feeding component is connected to the inductor arm 2 and is used to excite the inductor arm 2 .

[0026] In this embodiment, the inductor arm 2 is spirally disposed on the side wall of the groove from the bottom wall of the groove toward the opening, and the spiral structure of the inductor arm 2 can be a square spiral structure, or a circular spiral structure, an elliptical spiral structure, or a polygonal spiral structure.

[0027] In this embodiment, by filling the dielectric 3 in the gap between two adjacent turns of the inductor arms 2, the inductance can be effectively increased, thereby achieving the effect of increasing the inductance value without changing the size.

[0028] In this embodiment, the medium 3 may preferably be a material with a relative dielectric constant of 10, a relative conductivity of 1.0, and a loss tangent value of 0.

[0029] In other embodiments, medium 3 may also be made of a material with a relative dielectric constant of 8, a relative conductivity of 0.8, and a loss tangent value of 0. Similarly, in other embodiments, medium 3 may also be made of a material with a relative dielectric constant of 12, a relative conductivity of 1.2, and a loss tangent value of 0.

[0030] In this embodiment, the inductor arms 2 arranged in a spiral manner cooperate with each other to form a spiral channel, and the spiral channel is filled with the medium 3.

[0031] Filling the spiral channel with the medium 3 can further effectively increase the inductance.

[0032] In this embodiment, the line width of the inductor arm 2 is 0.02032 mm, the thickness of the inductor arm 2 is 0.035 mm, and the width of the gap is 0.02032 mm.

[0033] In this embodiment, the thickness of the medium 3 filled in the gap is 0.035 mm.

[0034] In this embodiment, the length, width and height of the medium 3 filled in the spiral channel are 0.20346 mm, 0.2035 mm and 0.035 mm respectively.

[0035] In this embodiment, under the above-mentioned size design, the number of spiral turns of the inductor arm 2 is 3, and the length of one turn of the inductor arm 2 close to the opening of the groove is 0.4267 mm.

[0036] In this embodiment, the base plate assembly includes a printed circuit board 5 and a substrate 10 . The substrate 10 is disposed on the printed circuit board 5 , and the inductor arm 2 is disposed on a side of the substrate 10 away from the printed circuit board 5 .

[0037] In this embodiment, the substrate 10 may preferably be a Rogers RT / duroid 6010 dielectric substrate.

[0038] In this embodiment, the outer dimensions of the printed circuit board 5 are not less than the dimensions of the inductor arm 2 disposed near one end of the groove opening. The printed circuit board 5 is made of FR-4 material with a thickness of 0.09 mm, and the side length of the printed circuit board 5 should not be less than the length of a circle of the inductor arm 2 near the groove opening (i.e., not less than 0.4267 mm).

[0039] In this embodiment, the thickness of the substrate 10 may be 0.05 mm. In this embodiment, the material of the inductor arm 2 is copper.

[0040] In this embodiment, the feeding assembly includes a feeding terminal 8, a feeding arm 9, a first feeding input terminal 6 and a second feeding input terminal 7, the two ends of the feeding arm 9 are respectively connected to the first feeding input terminal 6 and an end of the inductor arm 2 away from the groove opening, the two ends of the second feeding input terminal 7 are respectively connected to the feeding terminal 8 and an end of the inductor arm 2 close to the groove opening, and the end of the first feeding input terminal 6 away from the feeding arm 9 is connected to the feeding terminal 8, and the feeding terminal 8 is used to excite the inductor arm 2.

[0041] In this embodiment, one end of the inductor arm 2 away from the groove opening is connected to the feed arm 9, the feed arm 9 extends through the substrate 10 to the side where the printed circuit board 5 is located, and the end extending toward the printed circuit board 5 is connected to the first feed input terminal 6, thereby connecting to the feed terminal 8 through the first feed input terminal 6. The above arrangement can effectively enhance the isolation between the first feed input terminal 6 and the second feed input terminal 7.

[0042] In this embodiment, the first feeding input terminal 6 and the second feeding input terminal 7 are insulated and isolated from each other.

[0043] In this embodiment, the material of the feeding end 8 is copper.

[0044] Please refer to Figure 5, the planar spiral inductor in this embodiment is simulated and analyzed (refer to the above for each setting size). The simulation model adopts lumped port excitation, and the port impedance is 50Ω. The analysis results are: in the range of DC to 10GHz, the maximum inductance value is 7×10 -8 H. It can be seen that compared with the inductor in the prior art (in the range of DC to 10GHz, the maximum inductance value is 3.2×10 -9 H), the inductance value is increased by 21 times without changing the inductor size. It can be seen that the inductance value of the planar spiral inductor proposed in this embodiment can be significantly improved without changing the inductor size.

[0045] It should also be noted that the size setting of the planar spiral inductor proposed in this embodiment is not a condition that limits the improvement of inductance. In other embodiments, the parameters can be set according to actual conditions, and the applicability is relatively strong.

[0046] In addition, there are no special requirements for the shape and size of the planar inductor coil, the complexity of the manufacturing process is low, and the dielectric material is easy to obtain. It can be seen that the manufacturing cost of the planar spiral inductor is low, and it is also suitable for the design of inductors of other sizes and planar shapes.

[0047] The above are only preferred embodiments of this specification and are not intended to limit this specification. For those skilled in the art, this specification may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included in the protection scope of this specification.

Claims

1. A planar spiral inductor, characterized in that: It includes an inductor body, an inductor arm, a base plate component and a feeding component; The inductor body is provided with a groove with an opening at one end, the bottom plate assembly is provided on the bottom wall of the groove opposite to the opening, the inductor arm is provided on the side wall of the groove with the circumference of the groove as the spiral direction, and there is a gap between two adjacent circles of the inductor arm, and the gap is filled with a medium, and the medium is a material with a relative dielectric constant of 8-12, a relative conductivity of 0.8-1.2, and a dielectric loss tangent value of 0; The feeding component is connected to the inductor arm and is used to excite the inductor arm.

2. The planar spiral inductor according to claim 1, characterized in that: The inductor arms arranged in a spiral manner cooperate with each other to form a spiral channel, and the spiral channel is filled with the medium.

3. The planar spiral inductor according to claim 1, characterized in that: The line width of the inductor arm is 0.02032 mm, the thickness of the inductor arm is 0.035 mm, and the width of the gap is 0.02032 mm.

4. The planar spiral inductor according to claim 1, characterized in that: The base plate assembly comprises a printed circuit board and a substrate, wherein the substrate is arranged on the printed circuit board, and the inductor arm is arranged on a side of the substrate away from the printed circuit board.

5. The planar spiral inductor according to claim 1, characterized in that: The inductor arm is made of copper.

6. The planar spiral inductor according to claim 1, characterized in that: The thickness of the medium filled in the gap is 0.035 mm.

7. The planar spiral inductor according to claim 2, characterized in that: The length, width and height of the medium filled in the spiral channel are 0.20346 mm, 0.2035 mm and 0.035 mm respectively.

8. The planar spiral inductor according to claim 1, characterized in that: The feeding component includes a feeding end, a feeding arm, a first feeding input end and a second feeding input end, two ends of the feeding arm are respectively connected to the first feeding input end and an end of the inductor arm away from the groove opening, two ends of the second feeding input end are respectively connected to the feeding end and an end of the inductor arm close to the groove opening, and an end of the first feeding input end away from the feeding arm is connected to the feeding end, and the feeding end is used to excite the inductor arm.

9. The planar spiral inductor according to claim 8, characterized in that: The first feeding input terminal and the second feeding input terminal are insulated and isolated from each other.

10. The planar spiral inductor according to claim 8, characterized in that: The material of the feeding end is copper.

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