CN110690037A

CN110690037A - Inductance structure

Info

Publication number: CN110690037A
Application number: CN201911088901.XA
Authority: CN
Inventors: 康斯坦丁·库兹涅佐夫; 袁晟; 丹尼尔·拉尔斯顿
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-01-14
Anticipated expiration: 2039-11-08
Also published as: CN110690037B

Abstract

An inductive structure, comprising: the double-ring units are distributed on the same plane in parallel, each double-ring unit comprises a first ring and a second ring which are wound by the same conducting wire, the starting end of the conducting wire is positioned in the first ring, and the tail end of the conducting wire is positioned in the second ring; the first rings in the adjacent double-ring units share the same conducting wire segment, and the second rings in the adjacent double-ring units share the same conducting wire segment. The scheme provided by the invention can maximize the inductance isolation and reduce the electromagnetic coupling between the VCO resonators.

Description

Inductance structure

Technical Field

The invention relates to the technical field of circuits, in particular to an inductor structure.

Background

Recent advances in wireless communication technology allow entire Radio Frequency (RF) transceivers to be implemented on a single chip. However, implementing the entire RF transceiver on a single chip presents a number of challenges.

For example, in a Wideband Code Division Multiple Access (W-CDMA) transceiver, a single chip solution requires two RF Voltage-controlled oscillators (VCOs) to operate on one chip simultaneously. Such an arrangement can produce unwanted interaction between the two VCOs due to various different types of mutual coupling mechanisms, which can result in spurious receiver responses at unwanted frequencies in the transmit spectrum. The primary mutual coupling mechanism is typically the fundamental Electromagnetic (EM) coupling between resonators, i.e., between large inductor structures in the VCO.

There are a number of techniques in the prior art for reducing the EM mutual coupling between VCOs due to inductance. However, these schemes typically require additional circuitry (e.g., power dividers, mixers, etc.) to implement, which increases current consumption.

Disclosure of Invention

The invention solves the technical problem of how to effectively improve the inductance isolation and reduce the electromagnetic coupling between VCO resonators.

To solve the above technical problem, an embodiment of the present invention provides an inductor structure, including: the double-ring units are distributed on the same plane in parallel, each double-ring unit comprises a first ring and a second ring which are wound by the same conducting wire, the starting end of the conducting wire is positioned in the first ring, and the tail end of the conducting wire is positioned in the second ring; the first rings in the adjacent double-ring units share the same conducting wire segment, and the second rings in the adjacent double-ring units share the same conducting wire segment.

Optionally, the current directions of the first ring and the second ring in the double-ring unit are opposite, and the current directions of the first rings in adjacent double-ring units are opposite.

Optionally, in the plane, an outer contour of a pattern formed by the plurality of double-ring units is an axisymmetric pattern.

Optionally, the total area enclosed by each ring in the clockwise direction of current flow in the multiple double-ring units is equal to the total area enclosed by each ring in the counterclockwise direction of current flow.

Optionally, the start ends of the conductive lines of each dual-ring unit are coupled to each other, and the end ends of the conductive lines of each dual-ring unit are coupled to each other.

Optionally, the areas enclosed by the rings in the multiple double-ring units are equal.

Optionally, the number of the plurality of double loop units is 2.

Optionally, the 2 double-ring units are sequentially a first double-ring unit and a second double-ring unit from left to right on the plane.

Optionally, adjacent sides of the first loop and the second loop of the first double-loop unit have a first intersection, and a start end and a tail end of the conducting wire are arranged at the first intersection; the adjacent sides of the first ring and the second ring of the second double-ring unit have a second intersection point, and the starting end and the tail end of the conducting wire are arranged at the second intersection point.

Optionally, the first intersection point and the second intersection point are respectively located at center points of corresponding adjacent edges.

Optionally, the sum of the areas enclosed by the first ring of the first double-ring unit and the second ring of the second double-ring unit is equal to the sum of the areas enclosed by the second ring of the first double-ring unit and the first ring of the second double-ring unit.

Optionally, the first ring and the second ring of the first double-ring unit and the first ring and the second ring of the second double-ring unit respectively surround the same area.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

an embodiment of the present invention provides an inductor structure, including: the double-ring units are distributed on the same plane in parallel, each double-ring unit comprises a first ring and a second ring which are wound by the same conducting wire, the starting end of the conducting wire is positioned in the first ring, and the tail end of the conducting wire is positioned in the second ring; the first rings in the adjacent double-ring units share the same conducting wire segment, and the second rings in the adjacent double-ring units share the same conducting wire segment. Compared with the prior art, the inductance structure can maximize inductance isolation and reduce electromagnetic coupling between VCO resonators. Specifically, the inductance structure according to the embodiment of the present invention can achieve the effect of minimizing the generated magnetic field without being interfered by the magnetic field from the external source on the basis of not depending on the symmetrical design, and minimize the interference of the inductance structure to other devices or electronic circuits. Furthermore, each double-ring unit is provided with a starting end and a tail end of a conducting wire, so that the inductance structure can be connected with a plurality of active devices, and the magnetic fields generated by the inductance structure can be basically cancelled out due to the design of the shared conducting wire section and the parallel distribution, so that inductance isolation is realized to the maximum extent, and the electromagnetic coupling between VCO resonators and between the VCO internal inductance structure and other devices is reduced.

Further, the current directions of the first ring and the second ring in the double-ring unit are opposite, and the current directions of the first rings in the adjacent double-ring unit are opposite. Therefore, the current directions on half of the loops in the inductance structure are opposite to the current directions on the rest half of the loops, so that the inductance structure can achieve the effect of counteracting positive and negative magnetic fields, and the magnetic field interference on other devices or electronic circuits is reduced.

Drawings

Fig. 1 is a schematic diagram of a first inductor structure according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a second inductor structure according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a third inductor structure according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a fourth inductor structure according to an embodiment of the invention.

Detailed Description

As noted in the background, existing inductive designs for reducing electromagnetic coupling between VCO resonators need to be implemented by means of additional circuitry, increasing the current consumption of the VCO.

On the other hand, in some prior art schemes, the magnetic field of the inductance structure itself is cancelled by adopting a symmetrical design. For example, by designing the coils to be symmetrical about a horizontal and/or vertical axis, the magnetic fields generated by the inductive structure may be made to tend to cancel.

However, the inductor structure based on the symmetric design has strict requirements on the shape, so that the placeable position of the inductor structure in the VCO is limited, which is not favorable for the miniaturization design of the whole structure of the VCO.

The inductance structure can maximize inductance isolation and reduce electromagnetic coupling between the VCO resonators. Those skilled in the art understand that the same conductive line is not necessarily the same continuous conductive line, but may be connected by a connecting line due to layer crossing or line crossing in the layout.

Specifically, the inductance structure according to the embodiment of the present invention can achieve the effect of minimizing the generated magnetic field without being interfered by the magnetic field from the external source on the basis of not depending on the symmetrical design, and minimize the interference of the inductance structure to other devices or electronic circuits.

Furthermore, each double-ring unit is provided with a starting end and a tail end of a conducting wire, so that the inductance structure can be connected with a plurality of active devices, and the magnetic fields generated by the inductance structure can be basically cancelled out due to the design of the shared conducting wire section and the parallel distribution, so that inductance isolation is realized to the maximum extent, and the electromagnetic coupling between VCO resonators and between the VCO internal inductance structure and other devices is reduced.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 1 is a schematic diagram of a first inductor structure according to an embodiment of the present invention. The inductance structure described in this embodiment can be applied to a VCO resonator.

Specifically, referring to fig. 1, the inductance structure 100 may include: a plurality of double-ring units 110, wherein the double-ring units 110 are distributed in parallel on the same plane. Wherein, the plane can be a plane formed by an x axis and a y axis in the figure; the parallel distribution of the dual-ring units 110 on the same plane may mean that, in a plan view, that is, when viewed along a direction perpendicular to a plane formed by the x axis and the y axis, the dual-ring units 110 of the inductance structure 100 are parallel distributed on the same plane.

For example, referring to fig. 1, the number of the plurality of dual ring units 110 may be 2. In a top view, the 2 double-ring units 110 are a first double-ring unit 120 and a second double-ring unit 130 in sequence from left to right on a plane.

More specifically, each double-ring unit 110 may include a first ring 111 and a second ring 112 wound by the same conductive wire, wherein the starting end of the conductive wire is located in the first ring 111, and the end of the conductive wire is located in the second ring 112.

For example, referring to fig. 1, the first double-ring unit 120 may include a first ring 111 and a second ring 112 wound from the same wire, and a starting end 120a of the wire may be located in the first ring 111 of the first double-ring unit 120, and an end 120b of the wire may be located in the second ring 112 of the first double-ring unit 120; similarly, the second double-ring unit 130 may also include a first ring 111 and a second ring 112 wound by the same wire, and the starting end 130a of the wire may be located in the first ring 111 of the second double-ring unit 130, and the end 130b of the wire may be located in the second ring 112 of the second double-ring unit 130.

Further, the first rings 111 in adjacent double-ring elements 110 may share the same conductive line segment, and the second rings 112 in adjacent double-ring elements 110 may share the same conductive line segment. Wherein the wire segment belongs to a part of the wire.

Further, the common conductor segment may be the entire adjacent side of the adjacent loop, wherein the loop is the first loop 111 or the second loop 112. For example, referring to fig. 1, adjacent sides of the first loop 111 of the first dual-loop element 120 and the first loop 111 of the second dual-loop element 130 may share a wire segment s 1; similarly, the adjacent sides of the second ring 112 of the first dual-ring element 120 and the second ring 112 of the second dual-ring element 130 may share the wire segment s 2.

Since the first rings 111 of the adjacent double-ring units 110 share the same conductive line segment, and the second rings 112 also share the same conductive line segment, the current directions of the first rings 111 of the adjacent double-ring units 110 are opposite, and the current directions of the second rings 112 of the adjacent double-ring units 110 are also opposite. Therefore, the inductance structure 100 can achieve the effect of canceling forward and reverse magnetic fields. Here, the current direction means a direction in which a current flows in the ring in a plan view.

Accordingly, by designing a plurality of coils not having axial symmetry as a requirement, the inductance structure 100 of the present embodiment can substantially cancel the current induced on the coils by the external magnetic field.

Further, when the total magnetic fluxes of the plurality of dual-ring units 110 are the same and have opposite polarities, the magnetic field interference between the plurality of dual-ring units 110 may be substantially cancelled without being affected by the shape or symmetry of the dual-ring units 110. Wherein the total magnetic flux is an integral of the magnetic field over an area encompassed by the coil.

Further, the inductance structure 100 may be connected to a plurality of active devices, and through the structural design of the inductance structure 100, the magnetic fields generated by the plurality of double-loop units 110 and the active devices can be cancelled at a place far away from the VCO circuit, so as to prevent the VCO resonator from being interfered by the magnetic field.

For example, referring to fig. 1, for the first double-ring cell 120, the beginning 120a and the end 120b of the conductive line may be coupled to a first active device 140; for the second double-ring cell 130, the start 130a and end 130b of the conductive line may be coupled to a second active device 150.

In one or more embodiments, the current flow direction of the first ring 111 and the second ring 112 in the dual-ring cell 110 may be opposite, and the current flow direction of the first ring 111 in the adjacent dual-ring cell 110 may be opposite. Therefore, the current directions on half of the loops in the inductance structure 100 are opposite to the current directions on the remaining half of the loops, so that the inductance structure 100 can achieve the effect of counteracting the positive and negative magnetic fields, and the magnetic field interference on other devices or electronic circuits is reduced.

For example, assuming that the current inflow end of the first dual-ring unit 120 is the starting end 120a of the conductive wire and the current outflow end is the ending end 120b of the conductive wire, according to the current direction shown by the arrow in fig. 1, in a top view, the current direction of the first ring 111 of the first dual-ring unit 120 is clockwise, and the current direction of the second ring 112 of the first dual-ring unit 120 is counterclockwise. Accordingly, the direction of the magnetic flux generated by the first ring 111 of the first dual-ring unit 120 is a direction perpendicular to the plane and extending into the plane (indicated by "-") and the direction of the magnetic flux generated by the second ring 112 of the first dual-ring unit 120 is a direction perpendicular to the plane and extending out of the plane (indicated by "+").

Similarly, assuming that the current inflow end of the second double-ring unit 120 is the beginning end 130a of the conductive wire and the current outflow end is the end 130b of the conductive wire, according to the current square shown by the arrow in fig. 1, the current direction of the first ring 111 of the second double-ring unit 130 is counterclockwise and the current direction of the second ring 112 of the second double-ring unit 130 is clockwise in the top view. Accordingly, the direction of the magnetic flux generated by the first ring 111 of the second double-ring unit 130 is "+", and the direction of the magnetic flux generated by the second ring 112 of the second double-ring unit 130 is "-".

Thus, each dual-ring unit 110 can form an inductor structure similar to a figure 8, so that the current directions of the first ring 111 and the second ring 112 wound by the same wire are opposite.

For example, referring to fig. 1, the adjacent sides of the first and second loops 111 and 112 of the first double-loop unit 120 have a first intersection a at which the start and end 120a and 120b of the conductive wire are disposed; the adjacent sides of the first loop 111 and the second loop 112 of the second double-loop unit 130 have a second intersection B at which the start end 130a and the end 130B of the conductive wire are disposed. The first intersection point a may be a twisting point of the first double-ring unit 120 in the figure-8 shape, and the second intersection point B may be a twisting point of the second double-ring unit 130 in the figure-8 shape.

Taking the first double-ring unit 120 as an example, after the first ring 111 is obtained by winding from the starting end 120a in a clockwise direction, the second ring 112 is obtained by winding downwards in a counterclockwise direction, and the ending position of the second ring 112 is the end 120 b.

In one or more embodiments, the first intersection point a and the second intersection point B may be respectively located at center points of the corresponding adjacent sides.

In a variation, the positions of the current inflow end and the current outflow end may be interchanged, that is, current may flow into the end (e.g., the end 120b or the end 130b) and flow out from the start (e.g., the start 120a or the start 130a) of each conductive line. At this time, the current directions of the first ring 111 of the first dual-ring unit 120 and the second ring 112 of the second dual-ring unit 130 are both counterclockwise, and the current directions of the second ring 112 of the first dual-ring unit 120 and the first ring 111 of the second dual-ring unit 130 are both clockwise.

In one or more embodiments, the outer contour of the pattern formed by the plurality of double-ring units 110 in the plane may be an axisymmetric pattern. In practical applications, the axisymmetric pattern may be substantially symmetrical to meet the requirements of the manufacturing process. For example, in order to reduce sharp corners, some smoothing process may be performed at the corners of the first ring 111 and/or the second ring 112, so that the outline of the pattern formed by the plurality of double-ring units 110 is slightly non-axisymmetric; for example, in manufacturing, the outer contour of the pattern formed by the plurality of double-ring units 110 may be non-axisymmetric in a fine part due to process errors. But these do not affect the general axial symmetry of the outer contour.

For example, referring to fig. 1, the first double ring unit 120 and the second double ring unit 130 may be formed in a symmetrical pattern along the symmetry axis α, and may be formed in a symmetrical pattern along the symmetry axis β.

In one or more embodiments, the area enclosed by each ring of the plurality of dual ring units 110 may be equal. That is, the areas enclosed by the first ring 111 and the second ring 112 of the first dual ring unit 120, and the first ring 111 and the second ring 112 of the second dual ring unit 130 in fig. 1 may be equal.

In one or more embodiments, the total area enclosed by the respective rings in the clockwise direction of current flow in the plurality of dual ring cells 110 is equal to the total area enclosed by the respective rings in the counterclockwise direction of current flow. Based on the description related to the manufacturing process, the total areas may be substantially equal, or the deviation between the total area enclosed by the rings in the clockwise direction and the total area enclosed by the rings in the counterclockwise direction may be within a preset error range. For example, the predetermined error range may be up to 1000-.

For example, referring to fig. 1, since the current directions of the first ring 111 of the first dual-ring unit 120 and the second ring 112 of the second dual-ring unit 130 are both clockwise, and the current directions of the second ring 112 of the first dual-ring unit 120 and the first ring 111 of the second dual-ring unit 130 are both counterclockwise, the sum of the areas surrounded by the first ring 111 of the first dual-ring unit 120 and the second ring 112 of the second dual-ring unit 130 is equal to the sum of the areas surrounded by the second ring 112 of the first dual-ring unit 120 and the first ring 111 of the second dual-ring unit 130. Thus, the magnitude of the total magnetic flux generated by the rings in which the current directions are all clockwise can be substantially equal to the magnitude of the total magnetic flux generated by the rings in which the current directions are all counterclockwise.

In other words, for the inductor structure shown in fig. 1 in which multiple 8-shapes share adjacent sides, the current directions of two diagonal rings of any two adjacent double-ring units 110 are the same.

Further, the magnetic flux direction is opposite due to the opposite current directions, so that the magnetic flux generated by the ring with the clockwise current direction and the magnetic flux generated by the ring with the counterclockwise current direction can be substantially cancelled, so that the inductor structure 100 has substantially no magnetic field leakage to the outside, and the inductor isolation is realized.

In a variation, the thickness of the conductive lines of the different double-ring units 110 may be adjusted so that the magnetic fields in the forward and reverse directions generated by the multiple double-ring units 110 are substantially cancelled.

For example, the area surrounded by the first ring 111 of the first double ring unit 120 may be smaller than the area surrounded by the second ring 112 of the second double ring unit 130, and the area surrounded by the second ring 112 of the first double ring unit 120 may be smaller than the area surrounded by the first ring 111 of the second double ring unit 130. Further, the wire used to wind the first double loop unit 120 may be thicker than the wire used to wind the second double loop unit 130. Thereby, the effect that the magnetic field generated by the first ring 111 of the first dual-ring unit 120 and the second ring 112 of the second dual-ring unit 130 substantially cancel the magnetic field generated by the second ring 112 of the first dual-ring unit 120 and the first ring 111 of the second dual-ring unit 130 can still be achieved.

In one or more embodiments, for each dual ring unit 110, the area enclosed by the first ring 111 and the area enclosed by the second ring 112 of the dual ring unit 110 may be equal.

Further, the areas surrounded by the first rings 111 of the different double ring units 110 may be equal, and the areas surrounded by the second rings 112 of the different double ring units 110 may be equal.

As described above, the inductive structure 100 of the present embodiment can maximize the inductive isolation and reduce the electromagnetic coupling between the VCO resonators.

Specifically, the inductance structure 100 according to the embodiment of the present invention can achieve the effects of not being interfered by a magnetic field from an external source and minimizing a generated magnetic field on the basis of not depending on a symmetrical design, and minimize interference of the inductance structure 100 on other devices or electronic circuits.

Further, each dual-ring unit 110 has a start end and an end of a conductive line, so that the inductive structure 100 can be connected to a plurality of active devices, and the design of the common conductive line segment and the parallel distribution enables magnetic fields generated by the inductive structure 100 to be substantially cancelled out, thereby maximally achieving inductive isolation and reducing electromagnetic coupling between VCO resonators and between the inductive structure inside the VCO and other devices.

Fig. 2 is a schematic diagram of a second inductor structure according to an embodiment of the present invention. In the following detailed explanation, descriptions about matters and features common to the embodiment shown in fig. 1 are omitted, and only different points are explained. In particular, the same operational effects produced by the same structures are not mentioned one by one for each embodiment. Like parts are designated by like reference numerals throughout the several views.

Only the differences between the inductor structure 200 shown in fig. 2 and the inductor structure 100 shown in fig. 1 will be described here.

In the present embodiment, the difference from the embodiment shown in fig. 1 is mainly that the start ends of the conductive lines of each dual-ring unit 110 are coupled to each other, and the end ends of the conductive lines of each dual-ring unit 110 are coupled to each other.

For example, referring to fig. 2, the beginning 120a of the conductive line of the first dual-ring unit 120 is coupled to the beginning 130a of the conductive line of the second dual-ring unit 130, and the end 120b of the conductive line of the first dual-ring unit 120 is coupled to the end 130b of the conductive line of the second dual-ring unit 130.

Therefore, a plurality of inductance structures 200 connected in parallel to the dual-ring unit 110 can be formed, and the inductance structures 200 can be coupled to an active device 240.

Fig. 3 is a schematic diagram of a third inductor structure according to an embodiment of the present invention. Only the differences between the inductor structure 300 shown in fig. 3 and the inductor structure 100 shown in fig. 1 will be described here.

In this embodiment, the difference from the above-described inductor structure 100 shown in fig. 1 is mainly that the common conductor segment may be part of the adjacent side of the adjacent loop.

Specifically, referring to fig. 3, the wire segment s1 common to the first loop 111 of the first dual-loop element 120 and the first loop 111 of the second dual-loop element 130 may be part of the adjacent sides of the two loops.

Similarly, the wire segment s2 shared by the second loop 112 of the first dual-loop element 120 and the second loop 112 of the second dual-loop element 130 may be part of adjacent sides of both loops.

In one or more embodiments, for each dual ring unit 110, the area enclosed by the first ring 111 and the area enclosed by the second ring 112 of the dual ring unit 110 may not be equal.

Further, the areas surrounded by the first rings 111 of the different double-ring units 110 may not be equal, and the areas surrounded by the second rings 112 of the different double-ring units 110 may not be equal.

For example, referring to fig. 3, on the basis that the sum of the areas surrounded by the first ring 111 of the first double-ring unit 120 and the second ring 112 of the second double-ring unit 130 is equal to the sum of the areas surrounded by the second ring 112 of the first double-ring unit 120 and the first ring 111 of the second double-ring unit 130, the area surrounded by the first ring 111 of the first double-ring unit 120, the area surrounded by the second ring 112 of the first double-ring unit 120, the area surrounded by the first ring 111 of the second double-ring unit 130, and the area surrounded by the second ring 112 of the second double-ring unit 130 may not be equal to each other.

Fig. 4 is a schematic diagram of a fourth inductor structure according to an embodiment of the invention. Only the differences between the inductor structure 400 shown in fig. 4 and the inductor structure 100 shown in fig. 1 will be described here.

In the present embodiment, the difference from the inductance structure 100 shown in fig. 1 is mainly that, for each dual-ring unit 110, the current directions of the first ring 111 and the second ring 112 of the dual-ring unit 110 may be the same.

For example, referring to fig. 4, the current directions of the first ring 111 and the second ring 112 of the first double-ring unit 120 are both clockwise, and the current directions of the first ring 111 and the second ring 112 of the second double-ring unit 130 are both counterclockwise.

Further, the sum of the areas surrounded by the first double-ring unit 120 is equal to the sum of the areas surrounded by the second double-ring unit 130. This also achieves the effect of canceling the magnetic field.

In a common variation of the embodiments shown in fig. 1 to 4, the starting end (e.g., the starting end 120a) and the end (e.g., the end 120b) of the conductive wire may be located on the same ring of the double-ring unit 110 wound by the conductive wire.

It should be noted that fig. 1 to 3 all illustrate the first ring 111 and the second ring 112 as being in a pentagonal structure, in practical applications, the first ring 111 and/or the second ring 112 may also be in a rectangular (as shown in fig. 4), a circular, a polygonal, or other structures.

For example, for each double-ring unit 110, the first ring 111 and the second ring 112 of the double-ring unit 110 may have the same shape, and both have a rectangular, circular, polygonal, or the like structure. Alternatively, the shapes of the first ring 111 and the second ring 112 may be different, for example, the first ring 111 may be pentagonal, and the second ring 112 may be circular.

For another example, the shape of the first ring 111 and/or the second ring 112 of each double ring unit 110 may be different for different double ring units 110.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An inductive structure, comprising:

the double-ring units are distributed on the same plane in parallel, each double-ring unit comprises a first ring and a second ring which are wound by the same conducting wire, the starting end of the conducting wire is positioned in the first ring, and the tail end of the conducting wire is positioned in the second ring;

the first rings in the adjacent double-ring units share the same conducting wire segment, and the second rings in the adjacent double-ring units share the same conducting wire segment.

2. The inductor structure of claim 1, wherein the first and second loops in the dual-loop unit have opposite current directions, and wherein the first loop in an adjacent dual-loop unit has opposite current directions.

3. The inductor structure of claim 1, wherein an outer contour of the pattern of the plurality of double-ring units is an axisymmetric pattern in the plane.

4. The inductor structure of claim 1, wherein the total area enclosed by each ring in the plurality of double-ring cells in the clockwise direction of current flow is equal to the total area enclosed by each ring in the counter-clockwise direction of current flow.

5. The inductor structure of claim 1, wherein the beginning terminals of the conductive lines of each double-ring unit are coupled to each other, and the end terminals of the conductive lines of each double-ring unit are coupled to each other.

6. The inductor structure of claim 1, wherein each of the rings in the plurality of double-ring units enclose an equal area.

7. The inductive structure of claim 1, wherein the number of said plurality of double loop units is 2.

8. The inductor structure of claim 7, wherein the 2 double-ring units are a first double-ring unit and a second double-ring unit in sequence from left to right on the plane.

9. The inductor structure of claim 8, wherein adjacent sides of the first loop and the second loop of the first dual-loop unit have a first intersection, and wherein the beginning and the end of the conductive line are disposed at the first intersection; the adjacent sides of the first ring and the second ring of the second double-ring unit have a second intersection point, and the starting end and the tail end of the conducting wire are arranged at the second intersection point.

10. The inductive structure of claim 9, wherein the first and second intersections are each located at a center point of a corresponding adjacent side.

11. The inductor structure of claim 8, wherein a sum of areas surrounded by the first loop of the first double-loop unit and the second loop of the second double-loop unit is equal to a sum of areas surrounded by the second loop of the first double-loop unit and the first loop of the second double-loop unit.

12. The inductive structure of claim 8, wherein the first loop and the second loop of the first dual-loop unit, and the first loop and the second loop of the second dual-loop unit each enclose an equal area.