JP3184580B2 - Resonance filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance filter,
In particular, it relates to a one-chip resonance filter whose attenuation characteristics can be arbitrarily designed.

[0002]

2. Description of the Related Art As is well known, a large number of IC elements are used in various electronic / electric devices today, and in particular, with the development of electronic technology in recent years, a large number of high-performance ICs are used in various electronic devices. The device is used. Accordingly, regulations on interference waves are made so as not to generate interference waves from the terminal lines of these ICs toward the surroundings and to prevent the operation of high-performance ICs from being hindered by interference waves generated from other electronic devices. Is getting more intense year after year.

For this reason, a noise filter is connected to an electronic circuit of a device to be regulated, in particular, a terminal line of an IC element used in the electronic device, and a noise component of a signal flowing on the IC line is removed. Measures have been taken to reduce the interference.

The noise filter used in such an electronic circuit does not have a uniform attenuation characteristic depending on the configuration of the entire electronic circuit. Therefore, a noise filter having a different attenuation characteristic is appropriately designed for each circuit. Often used.

[0005]

However, in order to obtain good operating characteristics, it has been considered that the conventional noise filter should not have a resonance frequency as an ideal model. However, there is a problem that it is difficult to design a simple filter.

In particular, in a conventional noise filter, in order to approach an ideal filter, the resonance frequency is often set to a high frequency region far from a normal operation region. As will be described later, the present invention uses the resonance phenomenon positively. The fundamental configuration is completely different from that of the resonance filter.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to positively use a resonance phenomenon and easily obtain an arbitrary damping characteristic by a combination of resonance frequencies. An object of the present invention is to provide a one-chip resonance filter.

[0008]

In order to solve the above problem, a resonance filter according to the present invention has an inner lead and an outer lead connected at a predetermined interval, and at least one of the inner lead and the outer lead. A band-shaped conductor having a side extending inward or outward, and an insulator for preventing short-circuiting when the band-shaped conductor is entangled, including the band-shaped conductor and the insulator, It is characterized by being involved from the side.

A resonance filter according to the present invention further comprises a foldable laminated body having a plurality of insulating folds that are alternately folded in opposite directions and laminated, and one side of each of the folds.
A conductor provided so as to form a coil having a predetermined number of turns when the respective folded portions are alternately folded in the opposite direction and stacked, and an insulator for preventing a short circuit when the conductor is folded, A first input / output lead is connected to one end of the conductor, and a second input / output lead is connected to the middle of the conductor.

[0010] The resonance filter of the present invention further comprises a foldable laminated body having a plurality of folds which are alternately folded in opposite directions and laminated, and the folds are alternately reversed on one side of each of the folds. A conductor provided to form a coil having a predetermined number of turns when folded and stacked, and an insulator for preventing a short circuit when the conductor is folded. Each of the two input / output leads is connected to an intermediate position of the conductor.

Further, the resonance filter of the present invention comprises a laminated body formed by laminating a plurality of insulating layers, and a conductor element continuously circulating from one layer to another between a plurality of layers of the laminated body. A plurality of conductors forming a coil of a predetermined number of turns, a first input / output lead is connected to one end of the conductor, and a second input / output lead is provided between the conductors. It is characterized by connecting.

Further, the resonance filter according to the present invention comprises a laminated body formed by laminating a plurality of insulating layers, and a conductor element continuously circulating from one layer to another layer between the plurality of insulating layers. A plurality of conductors forming a coil having a predetermined number of turns, wherein each of the two input / output leads is connected to two different conductor elements located at intermediate positions between the conductors.

[0013]

According to the resonance filter of the present invention, the portion between the leads of the conductor and the other portions of the conductor are coiled by winding the strip-shaped conductor or by laminating the conductor in a spiral shape. That is, an inductor is formed.

Further, since each coil has a spatial spread, it also functions as a capacitor having capacitance such as stray capacitance.

Therefore, the conductor portion between the leads constitutes a first resonance circuit comprising an inductor and a capacitor, and the other conductor portions constitute a second or third resonance circuit.

Moreover, the coils of each resonance circuit are magnetically transformer-coupled to each other, and when this is considered as an equivalent circuit, each resonance circuit is electrically connected in series or in parallel.

As described above, according to the present invention, a plurality of resonance circuits having a unique resonance frequency are connected between the input and output terminals.

Therefore, by setting the resonance frequencies of at least two of the resonance circuits to substantially the same frequency among these resonance circuits, it is possible to obtain a resonance filter having a large attenuation characteristic in the frequency region.

In a resonance filter having a single resonance frequency, the attenuation characteristic decreases as the frequency becomes higher than the resonance frequency. In the present invention, the resonance frequency of the resonance circuit is increased so as to compensate for the deterioration of the attenuation characteristic. By setting the frequencies to be different from each other, it is possible to obtain a resonance filter having good attenuation characteristics over a wide band.

In particular, by setting the resonance frequency at multiple points, a resonance filter having good attenuation characteristics in an arbitrary frequency band can be easily formed.

As described above, according to the present invention, it is possible to easily design a resonance filter having an arbitrary attenuation pattern by setting and combining the resonance frequencies of a plurality of resonance circuits.

In particular, according to the present invention, since the above-mentioned filter utilizing a plurality of resonances can be formed as a one-chip element, the handling thereof is extremely convenient as compared with the case where the resonance circuit is constituted by a plurality of discrete components. And the cost is greatly reduced.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First Embodiment First, the structure of a resonance filter according to a first embodiment and its equivalent circuit will be described.

FIG. 1 shows an expanded state of the resonance filter of the first embodiment. The strip-shaped conductor 1 shown in FIG.
0, the outer lead 14 is near the right end and the inner lead 12
Are attached at a position of a distance T1 from the outer lead 14 and a distance T2 from the left end, so that the strip-shaped conductor 10 is extended only on the inner lead 12 side. Fig. (B)
The dielectric sheet 16 shown in FIG. 4 is to be wound together with the strip-shaped conductor 10 in order to prevent a short circuit between adjacent layers when the strip-shaped conductor 10 is rolled up.

FIG. 2 shows a strip-shaped conductor 10 and a dielectric sheet 1.
6 is shown.

When manufacturing the resonance filter of the first embodiment, first, the strip-shaped conductor 10 is overlapped with the dielectric sheet 16. Next, as shown in FIG. 2A, the strip-shaped conductor 10 is wound a plurality of times around the rotary winding shaft 18 starting from the left end. Next, after the winding end of the winding part 20 is fixed by heat welding or an adhesive, the winding part 20 is removed from the winding shaft 18. Next, the wound portion 20 is connected to the inner lead 1.
The wound portion 20 is pressed while being heated from a direction orthogonal to a line 90 connecting the lead 2 and the outer lead 14.

As a result, in the winding portion 20, as shown in FIG. 2B, the air core portion 92 extracted from the winding shaft 18 is deformed, and the interval between the inner lead 12 and the outer lead 14 is increased.

As a result, as shown in FIG. 2C, the resonance filter of this embodiment is provided on a substantially flat elliptical winding portion 20 and on one end surface of the winding portion 20. It is composed of the two leads 12 and 14.
In addition, the winding part 2
The outer surface of the casing may be covered with a metal foil or the like, or may be coated with epoxy or the like.

FIG. 3 shows an equivalent circuit of the resonance filter of this embodiment.

The resonance filter of the embodiment has a band-shaped conductor 10
By winding the leads 12, 14 of the conductor 10
The portion between them and the other portions of the conductor 10 function as coils, that is, inductors 22 and 26.

The inductors 22 and 26
Are trans-coupled to each other because they share part of their magnetic circuit.

Moreover, each of these inductors 22, 26
Has a spatial spread, so that capacitors 24 and 28 including, for example, stray capacitances are connected as shown in FIG.

Therefore, as in the present embodiment, the strip-shaped conductor 1
By winding 0, the band-shaped conductor 10 between the inner lead 12 and the outer lead 14 forms a first resonance circuit (parallel resonance circuit) including an inductor 22 having an inductance L1 and a capacitor 24 having a capacitance C1. Make up 100.

Further, the strip-shaped conductor 10 inside the inner lead 12 is composed of an inductor 26 having an inductance L2 and a capacitor 28 having a capacitance C2.
To form a second resonance circuit 110.

The two inductors 22, 2
6 is magnetically transformer-coupled because it is wound around the same winding shaft 18.

As described above, since the resonance filter of the embodiment has two resonance circuits inside, it has two resonance frequencies determined by respective inductances and capacitances.

In particular, according to the present invention, since the above-described resonance filter can be formed as a one-chip element, the handling becomes extremely convenient as compared with the case where the resonance circuit is constituted by a plurality of discrete components. The cost is also significantly lower.

In the present embodiment, the case of crushing flat as shown in FIG. 2B has been described as an example. However, the present invention is not limited to this. For example, the winding shaft 18 is moved from the state of FIG. The removed state may be the final shape. In addition, by using a magnetic core at the center of the winding portion 20 or using a magnetic conductor as the band-shaped conductor, the inductance of each inductor can be increased.

Next, the result of studying the attenuation characteristics of the resonance filter of this embodiment will be described. The present inventors have shown in FIG.
In the developed view of the strip-shaped conductor 10 shown in FIG.
2, the length T2 of the strip-shaped conductor 10 further inside and the interval T1 between the inner lead 12 and the outer lead 14 are changed to determine how these influence the operation of the resonance filter, that is, the attenuation characteristics. Was conducted.

FIG. 4 shows the inner leads 12 of the strip-shaped conductor 10.
Shows the experimental results when the length T2 inside the circle was changed. A copper foil having a distance between the inner lead 12 and the outer lead 14 of 120 mm, a width of 6 mm, and a thickness of 12 μm is used as the belt-shaped conductor 10.
For the dielectric sheet 16, a polyethylene tape having a thickness of 50 μm was used, and the attenuation characteristics were examined by changing the length T2. In the figure, the horizontal axis represents the frequency expressed in logarithm, and the vertical axis represents the insertion loss expressed in dB. Unless otherwise specified, the horizontal axis and the vertical axis are the same in the following characteristic diagrams. In the figure, a (solid line) indicates the length T
2 is 0 mm, b (dotted line) indicates the case where the length T2 is 40 mm, and c (dotted line) indicates the case where the length T2 is 80 mm.

From the results shown in FIG. 4, it can be seen that the second resonance point occurs when the foil length T2 inside the inner lead 12 is longer than a predetermined length (about 40 mm or longer). this is,
Two resonance circuits in the equivalent circuit shown in FIG. 3 are magnetically coupled, each of which indicates that a resonance phenomenon has occurred. Further, the first resonance frequency becomes lower as the foil length T2 becomes longer.

FIG. 5 shows the inner leads 12 of the strip-shaped conductor 10.
Experimental results when the interval T1 between the outer lead 14 and the outer lead 14 are changed are shown. In the figure, a (solid line) indicates a case where the length T1 is set to 60 mm, B (a dotted line) indicates a case where the length T1 is set to 80 mm, and C (a dashed line) indicates a case where the length T1 is set to 120 mm. I have. Note that the length T2 is 0 mm and the inner lead 1
The change in the first resonance frequency in FIG. 4 due to the change in the distance between the outer lead 14 and the outer lead 14 was examined. Other dimensions, materials, and the like are the same as those used in the experiment of FIG.

From the results shown in FIG. 5, it can be seen that since the length T2 is 0 mm, there is only one resonance point, and the resonance frequency becomes lower as the foil length T1 becomes longer.

FIG. 6 shows experimental results when the diameter of the winding shaft 18 around which the strip-shaped conductor 10 is wound is changed. In the figure, a (solid line) indicates a case where the wire is wound around a core having a diameter of 2.8 mm, the number of turns is 10, and the inductance is 0.16 μH. B (dotted line) shows the case where the wire is wound around a core having a diameter of 8 mm, the number of turns is 4, and the inductance is 0.14 μH. C (dot-dash line) is a case where the core is wound around a core having a diameter of 18 mm, the number of windings is 2, and the inductance is 0.1 μH.
It is. In addition, the length T2 is 0 mm, and it is examined how much the first resonance frequency in FIG. 4 changes when the core diameter of the winding shaft 18 changes. Other dimensions, materials, and the like are the same as those used in the experiment of FIG.

From the results shown in FIG. 6, it can be seen that as the diameter of the winding core increases, the resonance frequency decreases despite the inductance value decreasing. This is presumed to indicate that the stray capacitance (corresponding to the capacitors 24 and 28) increases as the winding diameter increases.

From the above experimental results, the combination of the two resonance frequencies can be freely set to some extent by changing the lead interval T1, the length T2 of the portion extending inside the inner lead 12, or the diameter of the winding shaft 18. I understand that.

Therefore, by combining the resonance frequencies of a plurality of resonance circuits, a noise filter or the like having an arbitrary attenuation characteristic can be easily designed.

Hereinafter, a specific design example will be described in detail using a noise filter as an example.

First, in the filter shown in FIG.
The resonance frequency of the resonance circuit 100 is represented by f1, and the resonance frequency of the second resonance circuit is represented by f2.

In this case, for example, as shown in FIGS. 28A and 28B, by setting the resonance frequencies f1 and f2 to be substantially the same, the attenuation characteristics of these two resonance circuits are added. As shown in FIG. 28C, a noise filter having extremely sharp attenuation characteristics can be obtained in the resonance frequency region.

Further, as shown in FIGS. 29A and 29B, by setting the resonance frequencies f1 and f2 of the two resonance circuits 100 and 110 to relatively close values that complement each other in the deterioration of the attenuation characteristics, As shown in FIG. 29C, a noise filter having a stable attenuation characteristic in an arbitrary frequency band can be obtained.

By setting the resonance frequencies of the resonance circuits 100 and 110 to values separated from each other as shown in FIGS. 30A and 30B, the resonance frequencies of the respective resonance circuits 100 and 110 are set as shown in FIG. A noise filter having an attenuation characteristic only in a frequency band can be obtained.

Although the resonance filter of the present embodiment has been described by taking as an example the case of having two resonance circuits, the resonance filter may have three or more resonance circuits as necessary as in the embodiment described later. In this case as well, a filter having an arbitrary attenuation characteristic can be easily designed and formed by appropriately combining the resonance frequencies of these resonance circuits.

For example, the resonance filter of the embodiment is formed to have three resonance circuits, and as shown in FIGS. 31A and 31B, the resonance frequencies f1 and f2 of the two resonance circuits are set to the same value. By setting the resonance frequency f3 of the remaining one resonance circuit to a relatively close frequency so as to complement the attenuation characteristics of the two resonance circuits as shown in FIG. As shown in (d), a noise filter having good attenuation characteristics over a wide band can be obtained.

As described above, according to the present invention, a noise filter having an arbitrary attenuation characteristic can be easily designed in accordance with a circuit in which the filter is used. Therefore, for example, when a harmonic of a clock signal flows as noise in the signal line, a noise filter may be designed so that the resonance frequency is set in accordance with the frequency of the harmonic of the clock signal. The harmonic noise signal flowing through this signal line can be satisfactorily attenuated and removed.

As shown in FIG. 28, for a harmonic having a large value among a plurality of harmonic noise signals,
It is sufficient to form a noise filter so as to have a sharp attenuation characteristic at the harmonic frequency. This makes it possible to satisfactorily attenuate and remove the harmonic noise signal mixed in the signal line.

In particular, according to the present invention, since the above-mentioned filter utilizing a plurality of resonances can be formed as a one-chip element, the handling thereof is extremely convenient as compared with the case where the resonance circuit is constituted by a plurality of discrete components. And the cost is greatly reduced.

Second Embodiment Next, the structure of a resonance filter according to a second embodiment and its equivalent circuit will be described. The resonance filter according to the second embodiment includes:
The strip-shaped conductor 10 extends outside the outer leads 14.

FIG. 7 shows an expanded state of the resonance filter of the second embodiment, and FIG. 8 shows an equivalent circuit thereof. Members corresponding to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 7A, the strip-shaped conductor 10 of the second embodiment has an inner lead 12 near the left end, an outer lead 14 at a distance T1 from the inner lead 12, and a distance T3 from the right end. And the strip-shaped conductor 10 is extended only on the outer lead 14 side.
As in the first embodiment, the dielectric sheet 16 shown in FIG. 7B is used to prevent adjacent layers from short-circuiting when the strip-shaped conductor 10 is involved. The appearance of the resonance filter of this embodiment is almost the same as that of the first embodiment shown in FIG. 2 except that the positions where the inner leads 12 and the outer leads 14 are shifted slightly inward.

FIG. 8 shows an equivalent circuit of the resonance filter of this embodiment.

The resonance filter according to the embodiment has a band-shaped conductor 10
By winding the leads 12, 14 of the conductor 10
A first resonance circuit 100 composed of an inductor 22 having an inductance L1 and a capacitor 24 having a capacitance C1 is formed in a portion between the outer leads 1 and 2.
4, an inductor 30 having an inductance L3 and a capacitance C3
Resonance circuit 12 comprising capacitor 32 having
0 is configured. These two inductors 22, 30
Are wound around the same winding shaft 18,
Magnetically trans-coupled.

As described above, the resonance filter of this embodiment is
Like the resonance filter of the first embodiment, the resonance filter has two resonance frequencies. Therefore, it is possible to obtain an arbitrary attenuation characteristic by positively utilizing the resonance phenomenon.

Next, the result of studying the attenuation characteristics of the resonance filter of this embodiment will be described. The present inventors have shown in FIG.
In the developed view of the strip-shaped conductor 10 shown in FIG.
The length T3 of the strip-shaped conductor 10 located further outside of FIG. 4 was changed, and an experiment was performed to determine how this affects the operation of the resonance filter, that is, the attenuation characteristics.

FIG. 9 shows an experimental result when the length T3 is changed. In the figure, a (solid line) indicates a case where the length T3 is 0 mm, b (dotted line) indicates a case where the length T3 is 40 mm, C (dashed line) indicates a case where the length T3 is 80 mm, and d (two lines). The dotted line indicates the case where the length T3 is set to 120 mm, and E (the solid line) indicates the case where the length T3 is set to 240 mm. The other dimensions, materials, and the like are the same as those used in the first embodiment.

From the results shown in FIG. 9, it can be seen that the second resonance point occurs when the outer side extends beyond the outer lead 14, as in the case where the inner side extends. this is,
This is because two resonance circuits in the equivalent circuit shown in FIG. 8 are magnetically coupled, and are essentially equivalent to the equivalent circuit shown in FIG. Further, the first resonance frequency becomes lower as the foil length T3 becomes longer, similarly to the first embodiment.

From the above experimental results and the experimental results shown in FIGS. 5 and 6, by changing the lead interval T 1, the length T 3 of the portion extending outside the outer lead 14, or the diameter of the winding shaft 18, 2 It can be seen that the combination of the two resonance frequencies can be set freely to some extent.

Third Embodiment Next, the structure of a resonance filter according to a third embodiment and an equivalent circuit thereof will be described. The resonance filter according to the second embodiment includes:
The strip-shaped conductor 10 extends both inside the inner lead 12 and outside the outer lead 14.

FIG. 10 shows an expanded state of the resonance filter of the third embodiment, and FIG. 11 shows an equivalent circuit thereof. Members corresponding to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 10A, the inner lead 12 has a distance T from the left end of the strip-shaped conductor 10 of the third embodiment.
2, the outer lead 14 is attached at a distance T1 from the inner lead 12 and at a distance T3 from the right end.
The strip-shaped conductor 10 has a shape extended to both sides of the inner lead 12 and the outer lead 14. The dielectric sheet 16 shown in FIG. 10 (B) is used to prevent adjacent layers from short-circuiting when the strip-shaped conductor 10 is involved, as in the first and second embodiments. The appearance of the resonance filter of this embodiment is almost the same as that of the first embodiment shown in FIG.

FIG. 11 shows an equivalent circuit of the resonance filter of this embodiment.

The resonance filter according to the embodiment has a band-shaped conductor 10
By winding the leads 12, 14 of the conductor 10
A first resonance circuit 100 including an inductor 22 having an inductance L1 and a capacitor 24 having a capacitance C1 is formed in a portion therebetween.

Further, in the resonance filter of the present embodiment, a second resonance circuit 110 including an inductor 26 having an inductance L2 and a capacitor 28 having a capacitance C2 is provided on a portion of the strip-shaped conductor 10 inside the inner lead 12. A third resonance circuit 120 including an inductor 30 having an inductance L3 and a capacitor 32 having a capacitance C3 is formed at a portion of the strip-shaped conductive circuit 10 outside the outer lead 14. Since these three inductors 22, 26, and 30 are wound around the same winding shaft 18, they are magnetically transformer-coupled.

As described above, the resonance filter of this embodiment is
It has three resonance frequencies by three resonance circuits. Therefore, by arbitrarily combining these three resonance frequencies, it becomes possible to positively use the resonance phenomenon and obtain a desired attenuation characteristic.

Next, the result of studying the attenuation characteristics of the resonance filter of this embodiment will be described. The present inventors have shown in FIG.
In the developed view of the strip-shaped conductor 10 shown in FIG. 0, an experiment was conducted on how the lengths T2 and T3 were changed and how this affects the operation of the resonance filter, that is, the attenuation characteristics.

FIG. 12 shows the results of this experiment. In the figure,
A (solid line) indicates that the lengths T2 and T3 are both 0 mm, B (dotted line) indicates that the lengths T2 and T3 are both 40 mm, and C (dotted line) indicates that the lengths T2 and T3 are both 120 mm. Each case is shown. The other dimensions, materials, and the like are the same as those used in the first embodiment.

From the results shown in FIG.
If both the inner and outer leads 14 extend outside,
It can be seen that the second and third resonance points occur. This indicates that three resonance circuits in the equivalent circuit shown in FIG. 12 are magnetically coupled, and each of them has a resonance phenomenon. The first resonance frequency decreases as the foil lengths T2 and T3 increase, and the amount of attenuation increases or decreases depending on the balance between the foil lengths.

From the above experimental results and the experimental results shown in FIGS. 5 and 6, the foil lengths T1, T2, T3 or the winding
It can be seen that by changing the diameter of 8, the combination of the three resonance frequencies can be set to some extent freely.

Fourth Embodiment Next, the structure of a resonance filter according to a fourth embodiment and an equivalent circuit thereof will be described. The resonance filter according to the fourth embodiment includes:
A second band-shaped conductor 34 whose one end is grounded is simultaneously wound into the resonance filter of the second embodiment.
Members corresponding to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 13 shows a state in which the resonance filter of the fourth embodiment is developed. The strip-shaped conductor 10 and the dielectric sheet 16 shown in FIGS. 7A and 7B are the same as those in the first embodiment shown in FIG.

The second strip conductor 34 shown in FIG.
Is provided with a grounding lead 36 at one end. Further, the second strip-shaped conductor 34 is
0, and has a size facing a part of the band-shaped conductor 10 outside the outer lead 14 in this embodiment. The grounding lead 36 is connected to the outer lead 14 when the strip-shaped conductors 10 and 36 are overlapped and wound.
Are mounted at positions close to each other in terms of electric circuit.
The dielectric sheet 38 shown in FIG. 3D is to be wound together with the band-shaped conductor 34 in order to prevent a short circuit between adjacent layers when the second band-shaped conductor 34 is wound.

FIG. 14 shows a state in which the strip-shaped conductors 10, 34 and the dielectric sheets 16, 38 are overlapped and wound.

In manufacturing the resonance filter of this embodiment, as shown in FIG. 13, the strip-shaped conductors 10 and 34 are overlapped via the dielectric sheets 16 and 38 to form a laminate. The inner lead 10 is connected to the inner end (left end in the figure) of the conductor 10.

Next, as shown in FIG. 14A, this laminate is wound around the winding shaft 18 a plurality of times. The outer lead 1 is located at a distance T3 from the outside of the strip-shaped conductor 10.
And the grounding lead 3 is shifted from the outer lead 14 by a half turn about the winding shaft 18 to the strip-shaped conductor 34.
6 is connected.

Thus, the strip-shaped conductor 1
With the 0 and 34 expanded, the distance between the two leads 14 and 36 can be made sufficiently close in terms of an electric circuit, and a resonance filter having excellent attenuation characteristics can be obtained.

Next, after the winding end of the winding portion 20 is fixed by heat welding or an adhesive, the winding portion 20 is removed from the winding shaft 18. Then, the wound portion 20 is connected to the outer lead 14.
Pressing while heating from a direction perpendicular to the line 90 connecting the lead 36 and the ground lead 36.

As a result, the winding portion 20 is moved to the position shown in FIG.
As shown in FIG.
Is deformed, and the leads 14, 12, and 36 are arranged in a straight line (inline), and the interval between the leads is increased.

By doing so, as shown in FIG. 14 (C), the resonance filter of the present embodiment has a substantially flat elliptical winding portion 20 and three in-line type winding portions provided on one end surface thereof. Of leads 14, 12, and 36.

FIG. 15 shows an equivalent circuit of this embodiment. In the figure, a second band-shaped conductor 34 outside the grounding lead 36 is wound around to form a resonance circuit 130 (series resonance circuit) including an inductor having an inductance L4 and a capacitor 42 having a capacitance C4. Since the inductor 40 is wound around the same winding shaft 18 as the other two inductors 22 and 30, these inductors are magnetically coupled.

Therefore, the resonance filter of this embodiment has three resonance frequencies of the respective resonance circuits, and it is possible to obtain an arbitrary attenuation characteristic by positively utilizing the resonance phenomenon.

In this embodiment, a case is considered in which a band-shaped conductor 34 for grounding is added to the resonance filter of the second embodiment. In other cases, for example, the inner lead of the resonance filter of the first embodiment is used. The same can be considered for the case where the band-shaped conductor 34 is arranged on the 12 side or the case where the band-shaped conductor 34 is arranged on the inner lead 12 side or the outer lead 14 side of the resonance filter of the third embodiment. 16 (A), (B),
(C) shows these equivalent circuits.

In the first to fourth embodiments, a dielectric sheet is used in order to prevent a short circuit when a band-shaped conductor is entangled. However, the present invention is not limited to this. For example, a short circuit may be prevented by coating an insulating material on the surface of the strip-shaped conductor.

Fifth Embodiment Next, a description will be given of a resonance filter according to a fifth embodiment. In the above-described embodiments, a plurality of magnetically coupled resonance circuits are obtained by winding the strip-shaped conductor 10, but in the present embodiment, this is realized by folding the dielectric sheet together with the conductor. It is.

FIG. 17 shows an outline of the resonance filter of this embodiment, FIG. 18 shows its appearance, and FIG. 19 shows a developed state.

In manufacturing the resonance filter of this embodiment, first, a dielectric sheet 50 shown in FIG. 19 is formed.
The dielectric sheet 50 includes a plurality of folded portions 52-1, 52-2,..., 52-11 which are folded and stacked.
Are continuously arranged via the bent portion 54. A perforation is formed in each bent portion 54 in advance to facilitate the bending. Further, although the folded portion 52 of the embodiment is formed in a square shape, the shape can be arbitrarily formed as long as the folded portion is laminated on each other when folded.

The conductor 56 having the pattern shown in FIG. 19 is provided on the surface of the dielectric sheet 50. This conductor 56 is provided on the surface side of each of the folded portions 52 arranged continuously, in a ring-shaped inductor conductor element 58-1, 58-2,. Are provided alternately and continuously in the opposite direction.
17 are folded alternately and in the opposite direction as shown in FIG. 17 to form a coil having a predetermined number of turns (5.5 turns in the embodiment).

At the lower right corner (see FIG. 19) of the conductor element 58-1 at one end of the conductor 56, an input / output lead 60a is provided at the lower right corner of the conductor element 58-8 in the middle of the conductor 56. (See FIG. 19)
b is provided.

The conductor 56 can be coated on the dielectric sheet 50 by various methods such as printing, etching, plating and the like, and a conductive plate having a pattern shown in FIG. It can be formed by any method such as attaching.

In the present embodiment, the conductor 56 is formed along the bent portion 54 so as to cover. Thus, even when the dielectric sheet 50 is soft, the dielectric sheet 50 can be easily and reliably folded at the bent portion 54 where the perforation is formed. When the pattern of the conductor 56 is formed over the bent portion 54, the perforations can be more easily bent by forming perforations on both the conductor and the dielectric sheet.

In this embodiment, the conductor 56 is
The surface is coated with an insulating layer. Instead of forming an insulating layer on the surface of the conductor 56, a second dielectric sheet having the same configuration as the dielectric sheet 50 is prepared.
These may be laminated and bonded together on the conductor 56. In order to simplify the following description, the following description will be made with the second dielectric sheet omitted.

Next, as shown in FIG. 17, the dielectric sheet 50 on which the conductor 56 is formed is folded in a bellows shape via a bent portion 54, and the folded portions 52-1 and 52- are formed.
, 52-11 are stacked. As a result, FIG.
8A is formed. Then, each of the ring-shaped conductor elements 58-1 and 58 partially cut away is formed.
, 58-11 overlap each other to form two coils each of which is formed by winding a single conductive wire a plurality of turns (in FIG. 17, the lower and upper two leads of the input / output lead 60b are formed).
One). Each of the two coils functions as an inductor having an inductance L1 and an inductor having an inductance L2, and is magnetically transformer-coupled.

Next, as shown in FIG. 18B, the laminate 44 is molded using a resin such as epoxy except for the input / output leads 60a and 60b to form a final resonance filter.

As described above, the resonant filter of this embodiment has two inductors connected in series and magnetically coupled, and has a planar spread, so that it also has a function as a capacitor. . Accordingly, the equivalent circuit is the same as that of the second embodiment shown in FIG. 8, and the attenuation characteristic of the resonance filter having two resonance frequencies is the same as that of the resonance filter described in the second embodiment. The combination of the two resonance frequencies is
By changing the number of turns, the shape, and the like of the coil, its inductance and capacitance can be arbitrarily set and changed.

In this embodiment, since one conductor 56 is spirally folded in the same direction to form two coils connected in series, the leakage flux of one coil causes the other coil to leak. And magnetically coupled. For this reason, the degree of magnetic coupling is weak, and to compensate for this,
As shown by a dotted line in FIG. 18A, a magnetic core insertion hole 46 is formed in the center of the laminated body 44, and the surface of the laminated body 44 is powder-coated with a magnetic material or housed in a magnetic material container. Thus, a magnetic path passing around the stacked body 46 through the insertion hole 46 may be formed. This is the same for the other embodiments described below.

Further, in this embodiment, the input / output leads 60b
Is mounted in the middle of the conductor 56 so that the conductor 5
6 is extended to the outside of the input / output lead 60b. However, the present invention is not limited to this.
Can be considered in the same way when extending the lower side) and extending both sides of the two input / output leads 60a and 60b. These equivalent circuits are shown in FIG.
Alternatively, it is the same as that shown in FIG. In this regard, the same applies to the other embodiments described below.

Further, a second conductor opposing a part of the conductor 56 of this embodiment is formed on the back side of the dielectric sheet 50,
A part of the second conductor and the input / output leads 60a,
A grounding lead may be provided at a position closer to any one of 60b in terms of an electric circuit. The equivalent circuit in this case is
This is the same as that shown in FIG. 15 or FIG. This is the same for the other embodiments described below.

In the resonance filter according to this embodiment, the conductor 56 is formed by repeating the same pattern.
As shown in FIG. 20, the coil pattern may be formed so as to gradually increase. Thus, when the dielectric sheet 50 is folded in a bellows shape, the conductor 56 is wound so that the coil diameter becomes gradually smaller.

Although the dielectric sheet 50 of this embodiment is formed as a continuous single sheet, each of the folded portions 52-1, 52-2,... They may be separately formed.

Sixth Embodiment Next, a resonance filter according to a sixth embodiment will be described. The resonance filter of the sixth embodiment uses a conductor 56 used in the fifth embodiment in which predetermined slit patterns are alternately formed in opposite directions.

FIG. 21 is an exploded explanatory view of this embodiment, and FIG.
FIG. 4 is an explanatory view showing a manufacturing procedure. Members corresponding to those in the above-described fifth embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 21, the conductor 56 is provided continuously on one side of the continuously arranged dielectric sheets 50, and a plurality of planar conductor elements 58-1 for inductors are formed. , 58-2, ..., 58-11. Each of the conductor elements 58-1, 58-2,.
.., 58-11, a predetermined slit pattern 64 is formed so as to form a coil having a predetermined number of turns when the dielectric sheets 50 are alternately and alternately folded and stacked. In the embodiment, the Y-shaped slit patterns 64 are alternately formed in opposite directions, thereby forming a current path indicated by an arrow A (see FIG. 21). On the right side of the conductor element 58-1, which is one end of the conductor 56, an input / output lead 60a is provided.
At -7, an input / output lead 60b is provided. In addition,
The conductor 56 can be formed on the dielectric sheet 50 by various methods such as printing, etching, plating, etc., and the surface of the conductor 56 is coated with an insulating layer. May be laminated and bonded together on the conductor 56 as in the fifth embodiment.

In the case of manufacturing the resonance filter of this embodiment, the dielectric sheet 5 having the conductor 56 coated on one surface is formed.
22 is folded in a zigzag manner via a bent portion 54 as shown in FIG. 22, and each of the folded portions 52-1 and 52-
2,..., 52-15 are stacked (for simplicity, the number of stacked layers is reduced in the figure). This allows
The stacked body 44 shown in FIG. 22B is formed. At this time, it is preferable to bond between the folded portions using an insulating adhesive or the like.

The wide input / output leads 60a and 60b protruding from the laminated body 44 shown in FIG. 22B are sequentially folded in the direction of the arrow in the figure to form the resonance filter shown in FIG. At this time, the folded input / output lead 6
It is preferable that Oa and 60b are adhered and fixed to the laminated body using an insulating adhesive or the like.

Next, as shown in FIG. 24D, the surface of the laminate is subjected to a surface treatment, and the input / output leads 60a,
An input / output terminal electrically connected to 60b is formed.

By doing so, a small SMD can be obtained.
(Surface mount device) type resonance filter can be obtained, which is extremely suitable for assembling a circuit whose automation has been advanced in recent years.

In this embodiment, a Y-shaped slit pattern 64 is considered, but a V-shaped or I-shaped slit pattern may be used.

Seventh Embodiment Next, a description will be given of a resonance filter according to a seventh embodiment. The resonance filter of the seventh embodiment is such that the dielectric sheet 50 and the conductor 56 of the sixth embodiment are separated into a plurality and assembled.

FIG. 23 is an explanatory diagram showing the manufacturing procedure of the present embodiment, and FIG. 24 shows the appearance of the resonance filter of the present embodiment. Members corresponding to those of the above-described fifth and sixth embodiments are denoted by the same reference numerals, and description thereof is omitted.

The resonance filter of this embodiment is provided between a laminated body 44 formed by laminating a plurality of insulating plates 82-1, 82-2,. And a conductor 56 forming a coil having a predetermined number of turns. Each insulating plate 82 may be formed using various insulating materials as needed. As the insulating material, for example, ceramics, plastic, various synthetic resins, and the like can be considered. The uppermost insulating plate 82-1 is coated with the input / output leads 60a.

The conductor 56 is provided between the insulating plate 82 and the through hole 84 from one layer to another layer.
. Are electrically connected via a plurality of conductor elements 58-1, 58-2,. The conductor element 58 is formed with a Y-shaped slit pattern 64.

The input / output leads 66a formed on the surface of the insulating plate 82-1 are connected to the insulating plate 82 through the through holes 84.
-2 is connected to the conductor element 58-1 provided on the -2.

Then, the insulating plates 82-1, 82-2,.
And a laminated body 44 shown in FIG.
Then, after performing a predetermined surface treatment as shown in FIG. 24B, input / output terminals electrically connected to the leads 60a and 60b are formed.

The resonance filter of this embodiment manufactured in this way has the same equivalent circuit as the resonance filters of the fifth and sixth embodiments described above, and therefore, the same attenuation characteristics can be obtained.

Eighth Embodiment Next, a description will be given of a resonance filter according to an eighth embodiment. The resonance filter of the eighth embodiment has a grounding conductor facing a part of the conductor 56 of the seventh embodiment via an insulating plate 82, and is formed to have an equivalent circuit shown in FIG. is there.

FIG. 25 is an explanatory view showing the manufacturing procedure of this embodiment, and FIG. 26 shows the appearance of the resonance filter of this embodiment. Members corresponding to those of the above-described fifth to seventh embodiments are denoted by the same reference numerals, and description thereof is omitted.

The resonance filter of this embodiment has a laminated body 44 formed by laminating a plurality of insulating plates 82-1, 82-2,.
And interlayers 86-1, 86-3, 86 of each of the insulating plates 82.
-5... To form a coil having a predetermined number of turns
And the other layers 86-2 of the insulating plate 82,
86-4, 86-6... And a second conductor 90 forming a coil having a predetermined number of turns.

[0128] On the surface of the uppermost insulating plate 82-1 is covered and formed one lead 60a of the first conductor 56 and a lead 92 of the second conductor 90.

Since the first conductor 56 is formed substantially similarly to the seventh embodiment, it functions as the first resonance circuit 100 and the second resonance circuit 110 of the equivalent circuit shown in FIG. I do.

The second conductor 90 is provided on the insulating plate 82.
, 36-14, a plurality of second conductor elements 94-1 circulating continuously while being electrically connected from one layer to another.
94-7, and functions as the resonance circuit 130 shown in FIG. Moreover, the second conductor 90 is formed of the first conductor 56 functioning as a coil.
And magnetically trans-coupled.

The leads 60a formed on the surface of the insulating plate 82-1 are connected to the insulating plate 82 through the through holes 84.
-2 is connected to the first conductor element 58-1 provided on the first conductor element 58-1. The grounding leads 92 formed on the uppermost insulating plate 82-1 are connected to the insulating plates 82-1 and 82-.
2 through a through hole 84 formed in the insulating plate 82-.
2 second conductor element 52-1 provided on the back side
It is connected to the.

Then, the insulating plates 82-1 and 82-2 are used.
Are laminated to form a laminate 44 shown in FIG.
After performing a predetermined surface treatment as shown in FIG. 26B, terminals electrically connected to the leads 60a, 60b, 92 are formed.

Thus, the multilayer resonance filter of the embodiment functions as a filter having an equivalent circuit shown in FIG.

The leads 12, 1 of the first conductor 56
With the arrangement of 4, a resonance filter having an equivalent circuit shown in FIG. 16 can be formed.

Ninth Embodiment Next, a resonance filter according to a ninth embodiment will be described. The resonance filter of the ninth embodiment is obtained by realizing the resonance filters of the fifth to seventh embodiments by using a film forming technique.

FIG. 27 is an explanatory view showing the manufacturing procedure of this embodiment. Members corresponding to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

When manufacturing the resonance filter of this embodiment,
First, as shown in FIG. 27A, the input / output leads 60a are formed so as to cover from the back surface to the side surface of the insulating substrate 68, and a predetermined slit pattern 64 (I-shaped in this embodiment) is formed on the surface of the substrate 68. A planar conductor element 58-1 having a shape is formed by thin-film technology.

Next, as shown in FIG. 27B, an insulating thin film 72-1 is formed on the surface of the insulating substrate 68 so that the end of the conductor element 58-1 is exposed.

Next, as shown in FIG. 27C, a planar conductor element 58-2 electrically connected to the end of the conductor 58-1 exposed on the insulating thin film 72-1 is formed by coating. I do. The I-shaped slit pattern 64 is also provided on the conductor element 58-2 in a direction opposite to the conductor element 58-1.
Is provided. Thereby, the conductor elements 58-1 and 58-1
In the case of -2, an energizing path continuously circulating from one layer to another layer is formed.

Next, as shown in FIG. 27D, the insulating thin film 72-2 is exposed so that the end of the conductor element 58-2 is exposed.
To form a coating.

By repeating such a thin film forming step and a conductor forming step, a laminate 44 is formed.

At this time, in the middle step shown in FIG. 27E, the conductor 58-
The input / output leads 60b continuous from 7 are coated.

Then, in the final step shown in FIG. 27F, the input / output leads 60a, 60a
An input / output terminal electrically connected to Ob is coated.

The resonance filter of this embodiment manufactured by such a process has the same equivalent circuit as the resonance filters of the fifth to seventh embodiments described above, and therefore has the same attenuation characteristics. Can be

Note that the multilayer resonance filter of this embodiment is
It can be easily formed using various thin film forming techniques, for example, a vapor deposition method, a sputtering method, an ion plating method, a vapor phase growth method and the like.

The resonance filter of the eighth embodiment can be formed by using a film forming technique.

In the sixth to ninth embodiments, the conductor 56 is formed on the insulating sheet 50 and the substrate 68, for example, or the insulating thin film 72 is formed on the conductor 56. However, the present invention is not limited to this. For example, a conductive plate may be stamped and formed into the shape of the conductor 56, and this may be fixed on an already sintered insulating plate, substrate, or insulating thin film. Alternatively, the conductor 56 may be formed of a plurality of separated conductive plates, and the conductive plate may be fixed on a sintered insulating plate, substrate, or insulating thin film.

[0148]

As described above, according to the present invention, by winding a strip-shaped conductor or by laminating a conductor, an inductor and a portion in which each of the leads and the other portions are magnetically coupled are provided. In order to function as a capacitor, it has a plurality of resonance circuits. Therefore, by actively utilizing the multiple resonance frequencies of these resonance circuits,
A one-chip resonance filter having an arbitrary attenuation characteristic can be obtained.

[Brief description of the drawings]

FIG. 1 is a developed view of a resonance filter according to a first embodiment, wherein FIG. 1A is a developed view of a band-shaped conductor, and FIG. 1B is a developed view of a dielectric sheet.

FIGS. 2A and 2B are external views of the resonance filter shown in FIG. 1, wherein FIG. 2A is a view of the wound state as viewed from the lead side, and FIG. 2B is a view of the wound state after being wound. FIG. 2C is a perspective view showing a state where the terminals are attached.

FIG. 3 is an equivalent circuit diagram of the resonance filter shown in FIG.

FIG. 4 is a frequency characteristic diagram comparing resonance frequencies of the resonance filter shown in FIG. 1 by changing the length of a band-shaped conductor inside an inner lead.

FIG. 5 is a frequency characteristic diagram in which a resonance frequency is compared by changing a distance between an inner lead and an outer lead of a resonance filter.

FIG. 6 is a frequency characteristic diagram comparing resonance frequencies by changing the core diameter of a winding shaft of a resonance filter.

FIG. 7 is a developed view of the resonance filter according to the second embodiment, FIG. 7A is a developed view of a conductor, and FIG. 7B is a developed view of a dielectric sheet.

8 is an equivalent circuit diagram of the resonance filter shown in FIG.

9 is a frequency characteristic diagram comparing resonance frequencies of the resonance filter shown in FIG. 7 by changing the length of a band-shaped conductor outside an outer lead.

FIG. 10 is a developed view of a resonance filter according to a third embodiment, FIG. 10A is a developed view of a conductor, and FIG. 10B is a developed view of a dielectric sheet.

11 is an equivalent circuit diagram of the resonance filter shown in FIG.

12 is a frequency characteristic diagram comparing resonance frequencies of the resonance filter shown in FIG. 10 by changing the length of each strip-shaped conductor inside the inside lead and outside the outside lead.

FIG. 13 is a developed view of a resonance filter according to a fourth embodiment, wherein FIG. 13A is a developed view of a conductor, FIG. 13B is a developed view of a dielectric sheet, and FIG. FIG. 4D is a development view of the second strip-shaped conductor, and FIG. 4D is a development view of the second dielectric sheet.

14 is an external view of the resonance filter shown in FIG. 13,
FIG. 1A is a diagram showing the wound state as viewed from the lead side, FIG. 2B is a diagram showing a state of being crushed after winding, and FIG. 1C is a perspective view of a state where terminals are attached. is there.

FIG. 15 is an equivalent circuit diagram of the resonance filter shown in FIG.

FIG. 16 is an equivalent circuit of a resonance filter according to another embodiment, and FIG. 16A is an equivalent circuit diagram when a second band-shaped conductor is added to the resonance filter shown in FIG. 13) and (C) are equivalent circuit diagrams when a second band-shaped conductor is added to the resonance filter shown in FIG.

FIG. 17 is an explanatory diagram of a manufacturing procedure of the resonance filter according to the fifth embodiment.

18 is an external view of the resonance filter shown in FIG. 17,
FIG. 2A is a diagram showing a folded laminate, and FIG. 2B is an external view explanatory diagram of a final resonance filter formed by molding the laminate.

FIG. 19 is an explanatory diagram of a case where a conductor is coated on the surface of a dielectric sheet.

FIG. 20 is another pattern explanatory view of the conductor.

FIG. 21 is an exploded explanatory view of a resonance filter according to a sixth embodiment.

FIG. 22 is an explanatory view of a manufacturing procedure of the resonance filter shown in FIG. 23, wherein FIG. 22A is an explanatory view in the case where a dielectric sheet provided with a conductor is formed in a bellows shape, and FIG. Is a view showing a state in which dielectric sheets are laminated, FIG. 4C is a view showing a state in which input / output leads are attached to the laminate, and FIG.
FIG. 4 is an explanatory diagram of a resonance filter as a final product formed by providing terminals on a laminate.

FIG. 23 is an exploded perspective view of a resonance filter according to a seventh embodiment.

24A and 24B are explanatory diagrams showing a state in which the resonance filter shown in FIG. 25 is formed in a laminated body, wherein FIG. 24A shows a state in which input / output leads are attached to the laminated body, and FIG. It is explanatory drawing of the resonance filter as a final product formed by providing the terminal in the body.

FIG. 25 is an exploded perspective view of a resonance filter according to an eighth embodiment.

26A and 26B are explanatory diagrams illustrating a state in which the resonance filter illustrated in FIG. 25 is formed in a multilayer body. FIG. 26A is a diagram illustrating a state in which input / output leads are attached to the multilayer body, and FIG. It is explanatory drawing of the resonance filter as a final product formed by providing the terminal in the body.

FIGS. 27A to 27F are explanatory diagrams of a manufacturing procedure of the resonance filter according to the eighth embodiment, and FIGS. 27A to 27F are diagrams illustrating respective manufacturing steps.

FIG. 28 is an explanatory diagram showing a design example of the resonance filter of the present invention.

FIG. 29 is an explanatory diagram showing another design example of the resonance filter of the present invention.

FIG. 30 is an explanatory diagram showing another design example of the resonance filter of the present invention.

FIG. 31 is an explanatory diagram showing another design example of the resonance filter of the present invention.

[Explanation of symbols]

10, 34 Band-shaped conductor 12 Inner lead 14 Outer lead 16, 38, 50 Dielectric sheet 18 Winding shaft 20 Winding portion 22, 26, 30 Inductor 24, 28, 32 Capacitor 38 Grounding lead 52 Folding portion 54 Bending portion 56 Conductor 58 Conductor element 60a, 60b I / O lead 68 Substrate 72 Insulating thin film 84 Through hole
IK010301

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H03H 5/02-7/12 H01F 17/00 H01F 27/00 H01G 4/40

Claims (7)

(57) [Claims] Has a first strip conductor which have a 1. A connected inner lead and outer lead a predetermined distance, and an insulating material to prevent short-circuiting of when involving the strip conductor, said inner The lead and the outer lead are located on the first strip-shaped conductor at positions separated from both ends thereof.
And the first strip-shaped conductor is connected to a region between the inner lead and the outer lead,
Extending from the lead and the outer lead to both ends of the strip-shaped conductor.
A resonance filter having a long region, wherein the first band-shaped conductor and the insulator are overlapped and wound around from the side of the inner lead. 2. A first of preventing the first strip conductor to have a inner lead and an outer lead connected to a predetermined interval, a short circuit when involving the strip conductor
And a second strip-shaped conductor facing a part of the first strip-shaped conductor and connected to a grounding lead; preventing a short circuit when the second strip-shaped conductor is involved. and a second insulator, wherein the inner leads and outer leads, said the first strip conductor, apart viewed from its end positions
And the first strip-shaped conductor is connected to a region between the inner lead and the outer lead,
Extending from the lead and the outer lead to both ends of the strip-shaped conductor.
A resonance filter having a long region, wherein the two band-shaped conductors and the two insulators are overlapped and wound from the side of the inner lead. 3. A foldable laminated body having a plurality of folds which are alternately folded and stacked in opposite directions, and wherein each of the folds is alternately folded and stacked on one side of each of the folds. provided to form a predetermined number of turns of the coil, the two input and output leads are connected conductor has an insulating body for preventing short circuit when folded said conductor, said conductor A resonance filter, wherein each of the two input / output leads is connected to an intermediate position. 4. A foldable laminated body having a plurality of folds that are alternately folded and stacked in opposite directions, and wherein each fold is alternately folded and stacked on one side of each of the folds. A first conductor provided to form a coil having a predetermined number of turns, to which two input / output leads are connected, and a first insulator for preventing a short circuit when the first conductor is folded. A second conductor provided on the other surface side of each of the folded portions so as to face a part of the first conductor and connected to a ground lead; and a second conductor is folded. the second insulator and the body has a first resonance filter, characterized in that an intermediate position of the electric conductor connecting each of the two output leads to prevent a short circuit when it. 5. The resonance filter according to claim 1, wherein the insulator is formed as a dielectric sheet. 6. A laminate formed by laminating a plurality of insulating layers, and a plurality of conductor elements continuously circulating from one layer to another between a plurality of layers of the insulating layer, resonance filter, characterized by a conductive body and forming a number of coils, and connecting each of the two output leads to the intermediate position of the conductor. 7. A laminated body formed by laminating a plurality of insulating layers, and a plurality of conductor elements continuously circulating from a plurality of layers of the insulating layer from one layer to another layer are provided. A first conductor forming a number of coils; and a plurality of conductor elements continuously circulating from one layer to another layer between the insulating layers.
Forming a coil that is magnetically coupled with the conductive element of
Resonance filter, characterized by comprising: a second conductor ground leads are connected, and connecting each of the two output leads to the intermediate position of the first conductor.