KR100408184B1 - Inductor - Google Patents

Inductor Download PDF

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Publication number
KR100408184B1
KR100408184B1 KR20000053972A KR20000053972A KR100408184B1 KR 100408184 B1 KR100408184 B1 KR 100408184B1 KR 20000053972 A KR20000053972 A KR 20000053972A KR 20000053972 A KR20000053972 A KR 20000053972A KR 100408184 B1 KR100408184 B1 KR 100408184B1
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KR
South Korea
Prior art keywords
coil conductor
pattern
conductor pattern
inductor
width
Prior art date
Application number
KR20000053972A
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Korean (ko)
Other versions
KR20010067177A (en
Inventor
사카타게이지
Original Assignee
가부시키가이샤 무라타 세이사쿠쇼
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP11-260936 priority Critical
Priority to JP26093699A priority patent/JP2001085230A/en
Application filed by 가부시키가이샤 무라타 세이사쿠쇼 filed Critical 가부시키가이샤 무라타 세이사쿠쇼
Publication of KR20010067177A publication Critical patent/KR20010067177A/en
Application granted granted Critical
Publication of KR100408184B1 publication Critical patent/KR100408184B1/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/2804Printed windings

Abstract

An inductor having a low DC resistance and a high Q value is provided. On the surface of the insulating sheet, spiral coil conductor patterns are formed, respectively. Each coil conductor pattern is set such that the pattern width of the center portion j and the outer portion k of the spiral coil conductor pattern is larger than the pattern width of the inner portion i.

Description

Inductor

The present invention relates to an inductor, particularly an inductor used in a filter, a resonator, or the like for processing signals in the high frequency range.

An example having a specific structure of such a conventional inductor is shown in FIG. The inductor 50 includes an insulating sheet 51 having spiral coil conductor patterns 53 and 54 formed on each surface, and an insulating sheet 51 having lead-out patterns 52 and 55 formed on each surface thereof. And an insulating cover sheet 51 on which a conductor pattern is not previously formed.

The coil conductor patterns 53 and 54 are electrically connected in series with each other through via holes 57b provided in the insulating sheet 51 to form a coil L. One end of each of the coil conductor patterns 53 and 54 is electrically connected to the lead-out patterns 52 and 55 through via holes 57a and 57c provided on the insulating sheet 51, respectively.

After arrange | positioning continuously, the insulating sheet 51 is baked by one laminated body. On the surface of the laminate, an external input / output electrode electrically connected to the lead neighbor pattern is formed.

In the conventional inductor 50, each of the spiral coil conductor patterns 53 and 54 has a constant width and thickness. In addition, since each of the coil conductor patterns 53 and 54 is helical, the length of the line for one rotation of the coil is longer in the outer portion than in the inner portion of the spiral. As a result, in each of the coil conductor patterns 53 and 54, the direct current (DC) resistance of the line located in the outer part of the spiral is greater than the resistance of the line located in the inner part. This causes the DC resistance of the entire coil conductor patterns 53 and 54 to be increased. Here, if the inductance is L, the DC resistance is R, and the resonant frequency is f 0 , the Q value is expressed by Q = 2πf 0 L / R. Since the conventional inductor 50 has a large DC resistance as described above, the conventional inductor 50 has a problem that the Q value is small.

It is therefore an object of the present invention to provide an inductor having a low direct current resistance and a high Q value.

1 is an exploded perspective view showing the structure of a first embodiment of an inductor according to the present invention.

FIG. 2 is a perspective view illustrating an external shape of the inductor illustrated in FIG. 1.

3 is an exploded perspective view showing the structure of the second embodiment according to the present invention.

4 is a partial cross-sectional view of the spiral portion of the coil conductor pattern.

5 is an exploded perspective view showing the structure of a conventional inductor.

<Brief description of the main parts of the drawing>

1 ... inductor 2, 5 ... leadout pattern

3, 4 ... coil conductor pattern 11 ... insulation sheet

7a, 7b .. via hole 21 ... input external electrode

22 ... output external electrode 23, 24 ... coil conductor pattern

i ... inner part j ... center part

k ... outer portion W ... width

In order to achieve the above object, the inductor according to the present invention includes an insulating member and a spiral coil conductor pattern formed on the surface of the insulating member, the width of the coil conductor pattern is a central portion than the inner portion of the spiral coil conductor pattern And the outer portion is larger.

Since the width of the coil conductor pattern is larger in the central part and the outer part than the inner part, the cross-sectional area of the coil conductor pattern is larger in the helical outer part and the center part than the inner part. As a result, the DC resistance ratio (DC resistance per unit length) of the center portion and the outer portion of the spiral coil conductor pattern becomes smaller than the DC resistance ratio of the inner portion. As a result, the DC resistance of the entire coil conductor pattern is reduced.

Furthermore, when the coil conductor pattern is rotated three times and the pattern width of the central portion of the spiral coil conductor pattern is larger than the pattern width of the inner portion and the outer portion, the cross-sectional area of the coil conductor pattern is the inner portion of the spiral coil conductor pattern, It will increase in ascending order of the outer and center portions. Thus, the DC resistance ratio will decrease in descending order of the inner portion, outer portion and center portion. This causes the DC resistance of the entire coil conductor pattern to be small.

[First Embodiment]

1 shows a specific configuration of an inductor according to the first embodiment of the present invention. The inductor 1 includes an insulating sheet 11 having three spiral coil conductor patterns 3 and 4 formed on each surface thereof, an insulating sheet 11 having leadout patterns 2 and 5 formed on each surface thereof, and an insulation pattern not previously formed on each surface thereof. Cover sheet 11 is included. The insulating sheet 11 is made into a sheet by kneading the dielectric powder or the magnetic powder using a binder. Patterns 2 to 5 each consist of Ag, Pd, Cu, Ni, Au, Ag-Pd, or the like.

Patterns 2 to 5 are each produced by a method combining photolithography technology and wet etching technology, for example. In detail, a conductive layer made of Ag or the like is formed on the front surface of the insulating sheet 11 using a technique such as printing, sputtering, or deposition. A photo-resist layer is formed on this conductor layer. This photo-resist layer is then covered with a photo mask, which is then exposed. Next, the exposed resist layer is subjected to a developing process, and unnecessary portions of the resist layer are removed. This conductor layer is then removed with an etchant leaving the part applied with the resist layer. As a result, high precision patterns 2 to 5 are formed. Thereafter, the remaining resist layer is also removed.

In the coil conductor patterns 3 and 4, one end 3a and 4a of them are disposed at the outer peripheral edge portion of the insulating sheet 11, the other end 3b and 4b are respectively disposed at the center portion of the insulating sheet 11, and the spiral portion is a spiral coil. It extends in the vicinity between the outer peripheral edge portion and the central portion of the conductor pattern. Each of the coil conductor patterns 3 and 4 is arranged such that the pattern width of the center portion j and the outer portion k of the spiral coil conductor pattern is longer than the pattern width of the inner portion i of the spiral coil conductor pattern. In the case of this embodiment, the respective widths of the coil conductor patterns 3 and 4 increase in the order of the inner part i, the center part j and the outer part k of the spiral coil conductor pattern. The coil conductor patterns 3 and 4 are electrically connected in series with each other through the via hole 7a formed in the insulating sheet 11 to form the coil L.

One end of the lead-out pattern 2 is exposed on the left side of the insulating sheet 11. One end of the lead-out pattern 5 is exposed on the right side of the insulating sheet 11. Lead-out patterns 2 and 5 are electrically connected to coil conductor patterns 3 and 4 via via holes 7a and 7c formed in insulating sheet 11.

After the above-described insulating sheet 11 is continuously laminated and pressed, the insulating sheet 11 is fired into one stack 15 as shown in FIG. At the left and right ends of the laminate 15, an input external electrode 21 and an output external electrode 22 are formed by coating, transfer, sputtering, or the like, respectively. As the material of the external electrodes 21 and 22, Ag, Ag-Pd, Ni, Cu, or the like is used. The input external electrode 21 is electrically connected to one end of the coil L through the lead-out pattern 2, and the output external electrode 22 is electrically connected to the other end of the coil L through the lead-out pattern 5.

In the above-described monolithic inductor 1, the width of each of the coil conductor patterns 3 and 4 is longer than the inner part i of the center part j and the outer part k of the line part of the spiral coil conductor pattern. 4 Each cross-sectional area has a central portion j and an outer portion k of the spiral coil conductor pattern larger than the inner portion i. As a result, the DC resistance ratio of the center portion j and the outer portion k of the spiral coil conductor pattern is smaller than the inner portion i of the spiral coil conductor pattern. For this reason, it is possible that the DC resistance of the coil conductor patterns 3 and 4 becomes lower than the conventional coil conductor pattern which has a fixed width as a whole. The result is an inductor 1 with a high Q value. In addition, by keeping the width W (see FIG. 4) from the inner portion to the outer portion of the coil conductor pattern the same as the conventional width, the above-described effects can be achieved without reducing the inductance.

Second Embodiment

In Fig. 3, a specific configuration of the inductor according to the second embodiment of the present invention is shown. The inductor 20 has rotary coil conductor patterns 23 and 24 formed on its surface instead of the insulating sheets 11 and 11 used for the inductor 1 of the first embodiment, and has square coil conductor patterns 23 and 24 formed on its surface. Insulation sheets 21 and 21 are used.

Each of the coil conductor patterns 23 and 24 rotates three times, and the conductor width increases in ascending order of the inner part i, the outer part k and the center part j of the spiral coil conductor pattern. Thus, the cross-sectional areas of the respective coil conductor patterns 23 and 24 decrease in descending order of the inner part i, the outer part k and the center part j of the spiral coil conductor pattern. Accordingly, the DC resistance ratios of the coil conductor patterns 23 and 24 respectively decrease in descending order of the inner part i, the outer part k and the center part j of the spiral coil conductor pattern. This reduces the direct current resistance of the entire coil conductor patterns 23 and 24. Here, in order to avoid repetition of the description, the same parts have been matched by giving the same reference numerals to FIGS.

[Other Embodiments]

The present invention is not limited to the scope of the above embodiments, and may be variously applied within the scope of the spirit of the present invention. Although, for example, each of the above embodiments is produced by laminating insulating sheets each having a pattern formed on its surface, respectively, the present invention need not be limited to that one way. Alternatively, a pre-baked insulating sheet may be used. Moreover, monolithic inductors can be manufactured by the following method.

First, the insulating layer is formed of an insulating material such as a paste by a method such as printing, and a conductive material such as paste is applied to the surface of the insulating layer to form a predetermined conductor pattern. Next, an insulating material such as a paste or the like is applied to the conductor pattern to form an insulating layer made of the conductor pattern. In the same manner, the inductor having a monolithic structure is obtained by repeatedly repeating the method such as repeatedly overlapping the insulating layer and the conductor layer.

Moreover, the inductor according to the present invention is not limited to the stacked inductor, but includes an inductor having a spiral coil conductor pattern formed on the surface of an insulated substrate made of ceramic material, and the like. In addition, the rotational speed of the spiral coil conductor pattern is not limited to three times, and may exceed two or three times.

Below, samples of the inductor 20 having the structure shown in FIG. 3 will be described. The DC resistance of the inductor 20 is 1.9 mm for Re (coil conductor patterns 23 and 24 (thickness: 0.015 mm) radius), 1 mm for W (width from outer part k to inner part i), and d (spiral coil). The distance between the inner part i, the center part j and the outer part k of the conductor pattern is set to 0.1 mm, and i: j: k (the ratio of the respective pattern widths of the inner part i, the center part j and the outer part k) Is measured by varying as shown in Tables 1 and 2 below. In Table 1, marks * indicate data of samples outside the scope of the present invention.

Inner part i Center part j Outer part k DC resistance ratio (%) for i: j: k = 1: 1: 1 *One 1.1 One 0.18 One 1.1 1.1 -1.23 One 1.1 1.2 -2.18 One 1.1 1.3 -2.82 One 1.1 1.4 -3.09 One 1.1 1.5 -3.18 One 1.1 1.6 -3.05 *One 1.2 One 0.73 One 1.2 1.1 -0.91 One 1.2 1.2 -2.05 One 1.2 1.3 -2.78 One 1.2 1.4 -3.23 One 1.2 1.5 -3.46 One 1.2 1.6 -3.46 *One 1.3 One 1.55 One 1.3 1.1 -0.27 One 1.3 1.2 -1.59 One 1.3 1.3 -2.50 One 1.3 1.4 -3.09 One 1.3 1.5 -3.41 One 1.3 1.6 -3.50 One 1.3 1.7 -3.46

Inner part i Center part j Outer part k DC resistance ratio (%) for i: j: k = 1: 1: 1 One 1.4 1.2 -0.91 One 1.4 1.3 -1.96 One 1.4 1.4 -2.68 One 1.4 1.5 -3.14 One 1.4 1.6 -3.37 One 1.4 1.7 -3.41 One 1.6 1.5 -2.00 One 1.6 1.6 -2.46 One 1.6 1.7 -2.68 One 1.6 1.8 -2.73 One 1.8 1.7 -1.41 One 1.8 1.8 -1.64 One 1.8 1.9 -1.73

As apparent from Table 1 and Table 2, when the pattern width of each sample increased in ascending order of the inner part i, the outer part k, and the center part j of the spiral coil conductor pattern, the direct current resistance of each sample was i: j. It is reduced by more than 2% compared to conventional samples with a: k ratio of 1: 1: 1. Moreover, the samples in which each pattern width increases in ascending order of the inner part i, the outer part k, and the center part j of the spiral coil conductor pattern are each conventional samples having an i: j: k ratio of 1: 1: 1. Compared with this, the DC resistance value also decreases.

As is apparent from the foregoing description, according to the present invention, since the coil conductor patterns are arranged such that the pattern width of the central and outer portions of the spiral coil conductor pattern is larger than the pattern width of the inner portion, the cross-sectional area of the coil conductor pattern is helical coil. It is larger in the central part and the outer part than the inner part of the conductor pattern. As a result, the DC resistance ratios of the center portion and the outer portion of the spiral coil conductor pattern are smaller than the DC resistance ratios of the inner portion of the spiral coil conductor pattern. This reduces the DC resistance of the entire coil conductor, resulting in an inductor having a high Q value with excellent characteristics at high frequencies.

Although the present invention has been described by way of preferred embodiments, various modifications and changes of the present invention can occur apparently in light of the above description. Accordingly, the scope of the invention is to be understood as the scope of the claims rather than the scope of the description.

Claims (2)

  1. An inductor comprising a stack and an external electrode formed on the stack,
    The laminate is
    A first insulating sheet having a lead-out pattern 2,
    A second insulating sheet having a lead-out pattern 5, and
    Consists of a plurality of third insulating sheets having a spiral coil conductor pattern which is disposed between at least three turns and is disposed between the first insulating sheet having the lead-out pattern 2 and the second insulating sheet having the lead-out pattern 5 and ,
    Each of the coil conductor patterns of the plurality of third insulating sheets is electrically connected in series with each other through a via hole,
    The lead out pattern 2 and the lead out pattern 5 are each electrically connected to the coil conductor pattern through via holes, and are electrically connected to the external electrodes, respectively.
    And the width of the innermost portion of the coil conductor pattern is smaller than the width of other portions of the coil conductor pattern.
  2. The method of claim 1, wherein each of the spiral coil conductor patterns makes three revolutions,
    And the pattern width of the central portion of the spiral coil conductor pattern is greater than the pattern width of the inner and outer portions of the coil conductor pattern.
KR20000053972A 1999-09-14 2000-09-14 Inductor KR100408184B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP11-260936 1999-09-14
JP26093699A JP2001085230A (en) 1999-09-14 1999-09-14 Inductor

Publications (2)

Publication Number Publication Date
KR20010067177A KR20010067177A (en) 2001-07-12
KR100408184B1 true KR100408184B1 (en) 2003-12-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR20000053972A KR100408184B1 (en) 1999-09-14 2000-09-14 Inductor

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EP (1) EP1085538A1 (en)
JP (1) JP2001085230A (en)
KR (1) KR100408184B1 (en)
CN (1) CN1168102C (en)
TW (1) TW463185B (en)

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JP2002134319A (en) * 2000-10-23 2002-05-10 Alps Electric Co Ltd Spiral inductor
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JP3755453B2 (en) 2001-11-26 2006-03-15 株式会社村田製作所 Inductor component and method for adjusting inductance value thereof
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JP4965116B2 (en) * 2005-12-07 2012-07-04 スミダコーポレーション株式会社 Flexible coil
JP2007227566A (en) * 2006-02-22 2007-09-06 Tdk Corp Coil component
US9129741B2 (en) 2006-09-14 2015-09-08 Qualcomm Incorporated Method and apparatus for wireless power transmission
TWI319232B (en) 2006-10-02 2010-01-01 Via Tech Inc On-chip inductor
CN1929134B (en) * 2006-10-10 2010-04-14 威盛电子股份有限公司 Chip built-in inductance element
JP2008159618A (en) * 2006-12-20 2008-07-10 Shinko Electric Ind Co Ltd Inductor element
KR100869741B1 (en) * 2006-12-29 2008-11-21 동부일렉트로닉스 주식회사 A Spiral Inductor
CN101051548B (en) * 2007-02-26 2011-05-11 威盛电子股份有限公司 Inductive structure
KR100862489B1 (en) * 2007-06-11 2008-10-08 삼성전기주식회사 Spiral inductor
JP2009117546A (en) * 2007-11-05 2009-05-28 Asahi Kasei Electronics Co Ltd Planar coil, and manufacturing method thereof
TW201001457A (en) * 2008-06-30 2010-01-01 Delta Electronics Inc Magnetic component
JP5222258B2 (en) * 2009-09-15 2013-06-26 アルプス電気株式会社 Printed inductor, manufacturing method thereof, and voltage controlled oscillator
JP5482554B2 (en) * 2010-08-04 2014-05-07 株式会社村田製作所 Multilayer coil
US9431473B2 (en) 2012-11-21 2016-08-30 Qualcomm Incorporated Hybrid transformer structure on semiconductor devices
US10002700B2 (en) 2013-02-27 2018-06-19 Qualcomm Incorporated Vertical-coupling transformer with an air-gap structure
US9634645B2 (en) 2013-03-14 2017-04-25 Qualcomm Incorporated Integration of a replica circuit and a transformer above a dielectric substrate
US9449753B2 (en) 2013-08-30 2016-09-20 Qualcomm Incorporated Varying thickness inductor
US20150130579A1 (en) * 2013-11-12 2015-05-14 Qualcomm Incorporated Multi spiral inductor
US9906318B2 (en) 2014-04-18 2018-02-27 Qualcomm Incorporated Frequency multiplexer
KR102004791B1 (en) * 2014-05-21 2019-07-29 삼성전기주식회사 Chip electronic component and board having the same mounted thereon
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JP2019016745A (en) * 2017-07-10 2019-01-31 Tdk株式会社 Coil component

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Also Published As

Publication number Publication date
EP1085538A1 (en) 2001-03-21
TW463185B (en) 2001-11-11
CN1168102C (en) 2004-09-22
CN1288240A (en) 2001-03-21
KR20010067177A (en) 2001-07-12
JP2001085230A (en) 2001-03-30

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