Distributed constant type noise filter

Abstract

Provided is a distributed constant type noise filter that removes noise from two or more types of power supplies. 【Solution means】 A first capacitor part having a first cathode part, a second cathode part, and a first metal plate disposed between the first cathode part and the second cathode part with a dielectric therebetween and extending in a first direction; and a second capacitor part laminated on the first capacitor part, having a second metal plate disposed between the second cathode part and a third cathode part with a dielectric therebetween and extending in a second direction. The first capacitor part has a first electrode part and a second electrode part on both end sides in the first direction, and the second capacitor part has a third electrode part and a fourth electrode part on both end sides in the second direction. The first capacitor part is connected to one power supply, the second capacitor part is connected to the other power supply, and the first direction and the second direction intersect each other at a predetermined angle.

Description

Technical Field

[0001] The present invention relates to a distributed constant type noise filter, and particularly to a distributed constant type noise filter compatible with multiple power supplies and having excellent high-frequency characteristics in a wide band.

Background Art

[0002] Recently, with the miniaturization and high-speed operation of electronic devices, the wiring pitch of semiconductor elements used therein has also been miniaturized, and the clock and other speeds have become faster.

[0003] Accordingly, in LSIs and the like, high-frequency currents are generated, which do not stay near the LSIs but spread over a wide range in the mounting circuit board such as a printed wiring board, inductively couple to signal wirings and ground wirings, leak as electromagnetic waves from signal cables, etc., and have become a serious electromagnetic radiation problem.

[0004] As countermeasures against these, it is effective to separate the LSI, which is the source of high-frequency current, from the power supply system in terms of high frequency, that is, the power supply decoupling method.

[0005] Also, as these methods, noise filters such as bypass capacitors have conventionally been used as decoupling elements.

[0006] For power supply decoupling of LSIs operating at high speed, it is necessary to develop a noise filter with low impedance. However, due to the self-resonance phenomenon of capacitors, it has become difficult to maintain low impedance up to the high-frequency region.

[0007] As a capacitor as a noise filter with low impedance, a lumped constant type noise filter having a two-terminal configuration has been developed, and solid electrolytic capacitors, electric double layer capacitors, ceramic capacitors, etc. have been developed.

[0008] In order to remove electrical noise over a wide frequency band using these capacitors, it is necessary to mount a plurality of different types of capacitors, for example, different types of capacitors such as aluminum electrolytic capacitors, tantalum capacitors, and ceramic capacitors having different self-resonant frequencies.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0010] In the above Patent Document 1, As a distributed constant type noise filter, it includes a distributed constant circuit forming portion in which two dielectric bodies having a substantially flat plate shape sandwich a metal plate having a substantially flat plate shape. Further, it includes a cathode terminal electrically connected to this distributed constant circuit forming portion, an electrode portion in which a part of the metal plate protrudes from the dielectric body, and an anode terminal electrically connected to this electrode portion. In the distributed constant type noise filter having such a configuration, the ratio of the length W in the short side direction of the distributed constant circuit forming portion to the effective thickness h of the dielectric body and the length L in the long side direction of the distributed constant circuit forming portion are set based on the dielectric constant of the distributed constant circuit forming portion so as to remove electrical noise emitted from electronic components over a wide band.

[0011] Therefore, although it is possible to remove the noise of one type of power supply, there is a problem that it is difficult to remove the noise of two or more types of power supplies.

[0012] The present invention enables a single distributed constant type noise filter element to remove noise in a wide frequency band at two or more types of power supply voltages.

Means for Solving the Problems

[0013] In the distributed constant type noise filter according to the present invention, a distributed constant type noise filter that can be connected to two power supplies, a first capacitor section having a first cathode section, a second cathode section, and a first metal plate disposed between the first cathode section and the second cathode section via a dielectric and extending in a first direction; a second capacitor section laminated on the first capacitor section, having a second metal plate disposed between the second cathode section and the third cathode section via a dielectric and extending in a second direction; The first capacitor section has a first electrode section and a second electrode section on both end sides in the first direction, The second capacitor section has a third electrode section and a fourth electrode section on both end sides in the second direction, The first capacitor section is connected to one power supply, and the second capacitor section is connected to the other power supply, characterized in that the first direction and the second direction intersect each other at a predetermined angle.

[0014] In the distributed constant type noise filter according to the present invention, noise of two or more types of power supplies can be effectively removed.

Effect of the Invention

[0015] The distributed constant type noise filter according to the present invention is a distributed constant type noise filter that can be connected to two power supplies, a first capacitor section having a first cathode section, a second cathode section, and a first metal plate disposed between the first cathode section and the second cathode section via a dielectric and extending in a first direction; a second capacitor section laminated on the first capacitor section, having a second metal plate disposed between the second cathode section and the third cathode section via a dielectric and extending in a second direction; The first capacitor section has a first electrode section and a second electrode section on both end sides in the first direction, The second capacitor section has a third electrode section and a fourth electrode section on both end sides in the second direction, The first capacitor section is connected to one power supply, and the second capacitor section is connected to the other power supply. The first direction and the second direction are characterized by intersecting each other at a predetermined angle. As a result, noise from two or more types of power supplies can be effectively removed. When performing power supply decoupling for a high-speed operating LSI that requires two or more types of power supplies, it becomes unnecessary to mount a plurality of different types of capacitors, such as aluminum electrolytic capacitors, tantalum capacitors, ceramic capacitors, etc., having different self-resonant frequencies. Instead, it becomes possible to handle with a smaller number of components, leading to a reduction in the number of components, a reduction in the component area, and a reduction in the cost and time of component mounting, contributing to the IT industry. Furthermore, since it also leads to a reduction in CO2, it has the effect of contributing to the SDGs.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments will be described with reference to the drawings. In the description of the drawings, the same reference numerals are given to the same elements, and redundant descriptions are omitted. Also, the drawings are for the purpose of understanding, and the actual dimensional ratios do not necessarily match the actual ones. Also, it goes without saying that there are portions where the dimensional relationships and ratios are different between the drawings. The embodiments shown below are examples of devices and methods for embodying the technical idea of the present invention, and the embodiments of the present invention do not specify the materials, shapes, structures, arrangements, etc. of the components as the following ones.

[0018] FIG. 1 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 1(a) is a top view, and FIG. 1(b) is a cross-sectional view taken along line A-A of FIG. 1(a).

[0019] Figure 2 is a top view and a cross-sectional view in one embodiment of the present invention. Figure 2(a) is the top view, and Figure 2(b) is the cross-sectional view taken along line B-B of Figure 2(a).

[0020] Figure 3 is a top view and a cross-sectional view in one embodiment of the present invention. Figure 3(a) is the top view, and Figure 3(b) is the cross-sectional view taken along line C-C of Figure 3(a).

[0021] Figure 4 is a top view of the cathode and the cathode terminal in one embodiment of the present invention. In Figure 4, an example is shown in which there are a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, and the cathode 2 has a hexagonal shape.

[0022] Figure 5 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention. It has a first metal plate 7, a first electrode portion 3, and a second electrode portion 4, and an example is shown in which the first metal plate has a hexagonal shape.

[0023] Figure 6 is a top view of the second metal plate, the third electrode portion, and the fourth electrode portion in one embodiment of the present invention. It has a second metal plate 8, a third electrode portion 5, and a fourth electrode portion 6, and an example is shown in which the second metal plate 8 has a hexagonal shape.

[0024] In the top view of Figure 1(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0025] Also, in the cross-sectional view of Figure 1(b), the cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, and a seventh cathode portion 2g, the first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via a first dielectric 9, The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g. The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f. The capacitor forming portion includes a first capacitor and a second capacitor. One end of the cathode 2 has a first cathode terminal 11, and the other end of the cathode 2 has a second cathode terminal 12.

[0026] Next, in the top view of FIG. 2(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0027] Furthermore, in the cross-sectional view of FIG. 2(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f. The capacitor forming portion includes a first capacitor and a second capacitor. One end of the first metal plate 7 has a first electrode portion 3, and the other end of the first metal plate 7 has a second electrode portion 4.

[0028] Next, in the top view of FIG. 3(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0029] Furthermore, in the cross-sectional view of FIG. 3(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g. The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The capacitor forming portion includes the first capacitor and the second capacitor. One end of the second metal plate 8 has a third electrode portion 5, and the other end of the second metal plate 8 has a fourth electrode portion 6.

[0030] Here, in FIG. 2(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The first capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

[0031] At this time, in FIG. 5, the area of the first metal plate 7 may be smaller than the area of the cathode 2 in FIG. 4, which is for effectively confining the electromagnetic radiation noise from the first metal plate 7.

[0032] Furthermore, in FIG. 5, one protruding portion of the first metal plate 7 outside both sides where the first capacitor is formed is the first electrode portion 3, and the other portion is the second electrode portion 4.

[0033] In such a distributed constant type noise filter configured as described above, by connecting the first electrode portion 3 to the power supply terminal of the first power supply and the second electrode portion 4 to the first power supply terminal of the electronic component respectively, it is possible to supply the voltage while reducing the noise of the voltage supplied from the power supply terminal of the first power supply to the first power supply terminal of the electronic component.

[0034] Also, in FIG. 3(b), The second metal plate 8 forms a second capacitor by the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The second capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

[0035] At this time, the area of the second metal plate 8 in FIG. 6 may be smaller than the area of the cathode 2 in FIG. 4, which is for effectively confining the electromagnetic radiation noise from the second metal plate 8.

[0036] Furthermore, in FIG. 6, one protruding portion of the second metal plate 8 outside both sides where the second capacitor is formed is the third electrode portion 5, and the other portion is the fourth electrode portion 6.

[0037] In such a distributed constant type noise filter configured as described above, when the third electrode portion 5 is connected to the power supply terminal of the second power supply and the fourth electrode portion 6 is connected to the second power supply terminal of the electronic component, it is possible to supply the voltage while reducing the noise of the voltage supplied from the power supply terminal of the second power supply to the second power supply terminal of the electronic component.

[0038] Furthermore, as shown in FIG. 1(b), The cathode 2 is connected to a fixed potential such as a ground potential through the bottom surface of the cathode 2, the first cathode terminal 11, the second cathode terminal 12, etc., and functions as a distributed constant type noise filter with a wide frequency band. In addition, regarding the first cathode portion 2a, the second cathode portion 2b, the third cathode portion 2c, the fourth cathode portion 2d, the fifth cathode portion 2e, the sixth cathode portion 2f, and the seventh cathode portion 2g surrounding the first metal plate 7 and the second metal plate 8, by smoothing the surfaces of the surfaces facing the first metal plate 7 and the second metal plate 8 by chemical mechanical polishing (CMP) or the like, it is also possible to obtain stable characteristics as a distributed constant type noise filter.

[0039] Thus, in the distributed constant type noise filter of the present invention, noise during power supply in two or more types of power supplies can be effectively removed.

[0040] Here, an explanation of the distributed constant type noise filter will be given.

[0041] FIG. 7 is a top view of a first metal plate, a first electrode portion, and a second electrode portion in one embodiment of the present invention, and has a first metal plate 7, a first electrode portion 3, and a second electrode portion 4. The first metal plate has a rectangular shape.

[0042] At this time, the first metal plate 7 in FIG. 7 By sandwiching a first cathode portion 2a and a second cathode portion 2b having a shape like the cathode 2 in FIG. 4 and having an area equal to or larger than the area of the first metal plate 7 with a dielectric interposed therebetween, a first capacitor can be formed.

[0043] Also, when forming a distributed constant type noise filter, as shown in FIG. 5, it is also possible to make the transmission line as a metal plate hexagonal, and this hexagonal shape may also be a hexagonal shape with different side lengths and interior angles. Furthermore, the angle between the included first metal plate 7 and the second metal plate 8 can theoretically be made larger than 0 degrees and smaller than 180 degrees, but by making it 60 degrees or less, while considering the mounting area of each electrode portion, the filter characteristics of the distributed constant type noise filter can be made better. In addition, as shown in FIG. 7, it is also possible to make the transmission line as a metal plate rectangular, and it is also possible to make it into other shapes such as a polygon like an octagon or an ellipse, and it is also possible to make the sides and corners into arcs. By changing the shape of the metal plate in this way, it is possible to change the characteristics of the distributed constant type noise filter, and it is also possible to change the overall shape of the distributed constant type noise filter according to the mounting position of the distributed constant type noise filter.

[0044] Similarly, when forming a distributed constant type noise filter, the shape of the cathode can also be hexagonal as shown in Fig. 4. This hexagon may have different side lengths and interior angles. Similar to the metal plate 7 in Fig. 7, it can also be rectangular. Additionally, it can be a polygon such as an octagon or another shape such as an ellipse, and the sides or corners can be made into arcs. By changing the shape of the cathode, it becomes possible to change the characteristics of the distributed constant type noise filter, and it is also possible to change the overall shape of the distributed constant type noise filter according to the mounting position of the distributed constant type noise filter.

[0045] Here, if we assume, referring to the example in Fig. 7, that the length in the long side direction of the distributed constant type noise filter is L1 and the length in the short side direction of the distributed constant circuit forming portion is W1, then considering the relative permittivity of the dielectric between the first metal plate and the cathode and the distance between the first metal plate 7 and the cathode, values such as capacitance can be calculated.

[0046] At this time, in both electrode portions of the distributed constant type noise filter, it is connected to the first electrode portion 3 connected to the power supply terminal of the first power supply and the second electrode portion 4 connected to the first power supply terminal of an electronic component such as an LSI, respectively. Further, it is connected to a fixed potential such as a ground potential through the first cathode portion 2a which is the bottom surface of the cathode as the opposing metal layer of the distributed constant circuit forming portion, the first cathode terminal 11, the second cathode terminal 12, etc., thereby enabling it to function as a distributed constant type noise filter with a wide frequency band.

[0047] Here, the first capacitor has been described, but the same concept can be applied to the second capacitor, and the second capacitor can also function as a distributed constant type noise filter with a wide frequency band.

[0048] Here, as an example of the distributed constant type noise filter, an example of an aluminum solid electrolytic capacitor will be described with reference.

[0049] FIG. 8 is a cross-sectional perspective view of a solid electrolytic capacitor for explaining the present invention, and the structure of an aluminum solid electrolytic capacitor is basically the same.

[0050] Here, in the solid electrolytic capacitor of FIG. 8, the upper and lower surfaces of the metal plate 13 have an oxide film 14, and a solid electrolyte layer 15 such as a conductive polymer is provided on the upper part of the upper oxide film 14 and the lower part of the lower oxide film 14. Graphite and a silver paste layer 16 are provided on the upper part of the upper solid electrolyte layer 15 such as a conductive polymer and the lower part of the lower solid electrolyte layer 15 such as a conductive polymer.

[0051] This configuration is a strip line structure similar to a distributed constant type noise filter. The metal plate 13 corresponds to a transmission line, the oxide film 14 corresponds to a dielectric, and the solid electrolyte layer 15 such as a conductive polymer and the graphite and silver paste layer 16 correspond to a fixed potential such as a ground potential.

[0052] Also, although an aluminum foil or the like is used as the metal plate 13, the surface is roughened by an etching process or the like to increase the surface area, and an oxide film is formed on the surface as a dielectric. In the same shape, a larger capacitance can be obtained than that of a ceramic capacitor using a single material, and it is suitable for a distributed constant type noise filter.

[0053] Here, the structure of the distributed constant type noise filter according to the present invention, which can remove electrical noise over a wide band and at high frequencies, will be described below.

[0054] FIG. 9 is a perspective view showing a distributed constant circuit forming portion in one embodiment of the present invention.

[0055] At this time, in the transmission line model configured such that the internal metal plate 13 is sandwiched between a pair of metal plates 18 at GND potential via the third dielectric 17 as shown in FIG. 9, by defining the line width W1, the line length L1, the thickness D1 corresponding to the thickness of the dielectric, etc., the capacitance C and the inductance L per unit length can be simply calculated.

[0056] Also, the value of the relative permittivity used in the calculation is about 10 for aluminum oxide, but the relative permittivity of tantalum oxide is 24, etc. The relative permittivity varies depending on the metal oxide film. Also, if a ceramic material such as barium titanate is used, the relative permittivity becomes 2000 or more, and by changing the material itself such as the metal plate, different relative permittivities can be obtained due to its oxide film.

[0057] Also at this time, in the case of an aluminum solid electrolytic capacitor, etc., assuming that an oxide film is formed on the aluminum whose surface area is expanded about 300 times by etching in the distributed constant circuit forming portion, when considering an electric double layer capacitor, since the distributed constant circuit forming portion is generated at the interface between the activated carbon electrode surface and the electrolytic solution, it is estimated that the surface area becomes 300 times in the calculation result of the capacitance C, and the actual capacitance C will also become larger.

[0058] Furthermore, considering the wavelength shortening by the dielectric, the wavelength in the distributed constant circuit forming portion can be calculated by the following formula. λ = c / f·ε r 1 / 2 However, λ: wavelength (m), c: the speed of light 3.0×10 8 m / s, f: frequency Hz, ε r : relative permittivity, can be represented.

[0059] As an example of the frequency range of noise regulation generally required, when setting 30 MHz to 1 GHz, regarding the wavelength at 30 MHz where the wavelength is the longest, when ε r is equivalently considered and calculated, the wavelength values will be different for aluminum electrolytic capacitors and ceramic capacitors.

[0060] At this time, in order to sufficiently perform attenuation, it is desirable that the length of the long side direction of the noise filter be 1 / 4 wavelength or more.

[0061] In that case, by using an aluminum electrolytic capacitor or a ceramic capacitor, a distributed constant type noise filter capable of removing electrical noise over a wide frequency band can be obtained according to the set value of the length of the long side direction of the noise filter.

[0062] Also at this time, by making the relative dielectric constant of the first dielectric 9 and the relative dielectric constant of the second dielectric 10 in FIG. 1(b) the same value or different values, the capacitance of the first capacitor formed by the first metal plate 7 and the capacitance of the second capacitor formed by the second metal plate 8 can be changed, and it is also possible to change the impedance characteristics at each frequency.

[0063] Furthermore, in FIG. 1(a), it is also possible to connect the first electrode portion 3 and the third electrode portion 5 to the power supply terminals of the same power supply, and connect the second electrode portion 4 and the fourth electrode portion 6 to the power supply terminals of the same voltage of the same electronic component.

[0064] At this time, a capacitor having the combined capacitance of the first capacitor formed by the first metal plate 7 and the second capacitor formed by the second metal plate 8 is configured. Furthermore, by making the relative dielectric constant of the first dielectric 9 and the relative dielectric constant of the second dielectric 10 different values, it is also possible to obtain improved impedance characteristics at a plurality of specific frequencies and the like.

[0065] In addition, the distributed constant type noise filter of the present invention not only has the characteristic of being large in capacitance, but also has the characteristic that the impedance becomes small in a wide frequency band from low frequency to high frequency as compared with a conventional multilayer ceramic chip capacitor or the like.

[0066] ​ Therefore, for example, it is expected that it will be possible to replace a plurality of different types of capacitors such as aluminum electrolytic capacitors, tantalum capacitors, and ceramic capacitors having different self-resonant frequencies with a smaller number of capacitors.

[0067] Next, a case where the capacitor forming portion of the present invention is rectangular instead of hexagonal as shown in FIG. 1 will be described.

[0068] FIG. 10 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 10(a) is a top view, and FIG. 10(b) is a cross-sectional view taken along line D-D of FIG. 10(a).

[0069] FIG. 11 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 11(a) is a top view, and FIG. 11(b) is a cross-sectional view taken along line E-E of FIG. 11(a).

[0070] FIG. 12 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 12(a) is a top view, and FIG. 12(b) is a cross-sectional view taken along line F-F of FIG. 12(a).

[0071] FIG. 13 is a top view of the cathode and the cathode terminal in one embodiment of the present invention. In FIG. 13, it has a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, and the cathode 2 has a rectangular shape.

[0072] FIG. 14 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention. It has a first metal plate 7, a first electrode portion 3, and a second electrode portion 4. The first electrode portion 3 and the second electrode portion 4 are located in directions symmetric with respect to the center line of the first metal plate 7, and the first metal plate 7 has a rectangular shape.

[0073] FIG. 15 is a top view of a second metal plate, a third electrode portion, and a fourth electrode portion in an embodiment of the present invention, and includes a second metal plate 8, a third electrode portion 5, and a fourth electrode portion 6. The third electrode portion 5 and the fourth electrode portion 6 are located in directions symmetric with respect to the center line of the second metal plate 8, and the second metal plate 8 has a rectangular shape.

[0074] In the top view of FIG. 10(a), the distributed constant type noise filter of the present invention includes a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0075] Also, in the cross-sectional view of FIG. 10(b), The cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, and a seventh cathode portion 2g. The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g. The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f. The capacitor forming portion includes the first capacitor and the second capacitor. One end of the cathode 2 has the first cathode terminal 11, and the other end of the cathode 2 has the second cathode terminal 12.

[0076] Next, in the top view of FIG. 11(a), the distributed constant type noise filter of the present invention includes a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0077] Furthermore, in the cross-sectional view of FIG. 11(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9, The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10, The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f, The capacitor forming portion includes the first capacitor and the second capacitor, One end of the first metal plate 7 has the first electrode portion 3, and the other end of the first metal plate 7 has the second electrode portion 4.

[0078] Next, in the top view of FIG. 12(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0079] Furthermore, in the cross-sectional view of FIG. 12(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9, The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g, The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10, The capacitor forming portion includes the first capacitor and the second capacitor, One end of the second metal plate 8 has the third electrode portion 5, and the other end of the second metal plate 8 has the fourth electrode portion 6.

[0080] Here, in FIG. 11(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9, but The first capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

[0081] At this time, the area of the first metal plate 7 in FIG. 14 may be smaller than the area of the cathode 2 in FIG. 13, but this is to effectively confine the electromagnetic radiation noise from the first metal plate 7.

[0082] Furthermore, in FIG. 14, one protruding portion of the first metal plate 7 outside both sides where the first capacitor is formed is the first electrode portion 3, and the other portion is the second electrode portion 4.

[0083] In the distributed constant type noise filter having such a configuration, when the first electrode portion 3 is connected to the power supply terminal of the first power supply and the second electrode portion 4 is connected to the first power supply terminal of the electronic component respectively, it is possible to supply the voltage while reducing the noise of the voltage supplied from the power supply terminal of the first power supply to the first power supply terminal of the electronic component.

[0084] Also, in FIG. 12(b), The second metal plate 8 forms a second capacitor by the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10, The second capacitor has a transmission line structure called a strip line, and forms a distributed constant type noise filter.

[0085] At this time, the area of the second metal plate 8 in FIG. 15 may be smaller than the area of the cathode 2 in FIG. 13, but this is to effectively confine the electromagnetic radiation noise from the second metal plate 8.

[0086] Furthermore, in FIG. 15, one protruding portion of the second metal plate 8 outside both sides where the second capacitor is formed is the third electrode portion 5, and the other portion is the fourth electrode portion 6.

[0087] In the distributed constant type noise filter configured as described above, the third electrode portion 5 is connected to the power supply terminal of the second power supply, and the fourth electrode portion 6 is connected to the second power supply terminal of the electronic component, respectively, so that while reducing the noise of the voltage supplied from the power supply terminal of the second power supply, it becomes possible to supply the second power supply terminal of the electronic component.

[0088] Furthermore, as shown in FIG. 10(b), The cathode 2 functions as a distributed constant type noise filter with a wide frequency band by being connected to a fixed potential such as a ground potential through the bottom surface of the cathode 2, the first cathode terminal 11, the second cathode terminal 12, etc.

[0089] Thus, in the distributed constant type noise filter of the present invention, noise during power supply in two or more types of power supplies can be effectively removed.

[0090] Also at this time, by making the dielectric constant of the first dielectric 9 and the dielectric constant of the second dielectric 10 in FIG. 10(b) the same value or different values, the capacitance of the first capacitor by the first metal plate 7 and the capacitance of the second capacitor by the second metal plate 8 can be changed, and it is also possible to change the impedance characteristics at each frequency.

[0091] Furthermore, in FIG. 10(a), it is also possible to connect the first electrode portion 3 and the third electrode portion 5 to the power supply terminal of the same power supply, and connect the second electrode portion 4 and the fourth electrode portion 6 to the power supply terminal of the same voltage of the same electronic component.

[0092] At this time, a capacitor having the combined capacitance of the first capacitor formed by the first metal plate 7 and the second capacitor formed by the second metal plate 8 is configured. Furthermore, by making the relative dielectric constant of the first dielectric 9 and the relative dielectric constant of the second dielectric 10 different values, it is also possible to obtain improved impedance characteristics at a plurality of specific frequencies and the like.

[0093] Next, a case will be described where the capacitor forming portion of the present invention is not hexagonal as shown in FIG. 1 but rectangular, and the electrode portion of the metal plate is in the cross direction.

[0094] FIG. 16 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 16(a) is the top view, and FIG. 16(b) is a cross-sectional view taken along line G-G of FIG. 16(a).

[0095] FIG. 17 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 17(a) is the top view, and FIG. 17(b) is a cross-sectional view taken along line H-H of FIG. 17(a).

[0096] FIG. 18 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 18(a) is the top view, and FIG. 18(b) is a cross-sectional view taken along line I-I of FIG. 18(a).

[0097] FIG. 13 is a top view of the cathode and the cathode terminal in one embodiment of the present invention. In FIG. 13, it has a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, and the cathode 2 has a rectangular shape.

[0098] FIG. 19 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention. It has a first metal plate 7, a first electrode portion 3, and a second electrode portion 4. The first metal plate 7 has a rectangular shape, and the first electrode portion 3 and the second electrode portion 4 are located in directions symmetric with respect to the center point of the first metal plate 7.

[0099] FIG. 20 is a top view of the second metal plate, the third electrode portion, and the fourth electrode portion in one embodiment of the present invention. It has a second metal plate 8, a third electrode portion 5, and a fourth electrode portion 6. The second metal plate 8 has a rectangular shape, and the third electrode portion 5 and the fourth electrode portion 6 are located in directions symmetric with respect to the center point of the second metal plate 8.

[0100] In the top view of FIG. 16(a), the distributed constant type noise filter of the present invention includes a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0101] Also, in the cross-sectional view of FIG. 16(b), the cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, and a seventh cathode portion 2g. The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g. The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f. The capacitor forming portion includes the first capacitor and the second capacitor. One end of the cathode 2 has the first cathode terminal 11, and the other end of the cathode 2 has the second cathode terminal 12.

[0102] Next, in the top view of FIG. 17(a), the distributed constant type noise filter of the present invention includes a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0103] Furthermore, in the cross-sectional view of FIG. 17(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f. The capacitor forming portion includes a first capacitor and a second capacitor. One end of the first metal plate 7 has a first electrode portion 3, and the other end of the first metal plate 7 has a second electrode portion 4.

[0104] Next, in the top view of FIG. 18(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0105] Furthermore, in the cross-sectional view of FIG. 18(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g. The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The capacitor forming portion includes a first capacitor and a second capacitor. One end of the second metal plate 8 has a third electrode portion 5, and the other end of the second metal plate 8 has a fourth electrode portion 6. ■ Generation status of capacitors

[0106] Here, in FIG. 17(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The first capacitor has a transmission line structure called a strip line and forms a distributed constant type noise filter.

[0107] At this time, the area of the first metal plate 7 in FIG. 19 may be smaller than the area of the cathode 2 in FIG. 13, which is for effectively confining the electromagnetic radiation noise from the first metal plate 7.

[0108] Furthermore, in FIG. 19, One protruding part of the first metal plate 7 outside both sides forming the first capacitor is the first electrode part 3, and the other part is the second electrode part 4. However, since the distance from the first electrode part 3 to the second electrode part 4 is longer than the distance from the first electrode part 3 to the second electrode part 4 in FIG. 14, it can be expected to efficiently remove noise in a wider frequency band.

[0109] Moreover, not only are the first electrode part 3 and the second electrode part 4 installed in a point-symmetric direction from the center point of the first metal plate 7, but also by flexibly changing the position on the opposite sides of the first metal plate 7 and changing the size and shape of the first electrode part 3 and the second electrode part 4, it becomes possible to make a flexible response according to the position and situation of the power supply source and the power supply destination.

[0110] Such a distributed constant type noise filter can supply the voltage to the first power supply terminal of the electronic component while reducing the noise of the voltage supplied from the first power supply terminal of the first power supply by connecting the first electrode part 3 to the first power supply terminal of the first power supply and connecting the second electrode part 4 to the first power supply terminal of the electronic component respectively.

[0111] Also, in FIG. 18(b), The second metal plate 8 forms a second capacitor by the second cathode part 2b and the third cathode part 2c via the second dielectric 10. The second capacitor has a transmission line structure called a strip line and forms a distributed constant type noise filter.

[0112] At this time, the area of the second metal plate 8 in FIG. 20 may be smaller than the area of the cathode 2 in FIG. 4, which is for effectively confining the electromagnetic radiation noise from the second metal plate 8.

[0113] Furthermore, in FIG. 20, One protruding part of the second metal plate 8 outside both sides where the second capacitor is formed is the third electrode part 5, and the other part is the fourth electrode part 6. However, Since the distance from the third electrode part 5 to the fourth electrode part 6 is longer than the distance from the third electrode part 5 to the fourth electrode part 6 in FIG. 15, it can be expected to efficiently remove noise in a wider frequency band.

[0114] Furthermore, not only are the third electrode part 5 and the fourth electrode part 6 located in directions point-symmetric from the center point of the second metal plate 8, but they can also be flexibly repositioned on the opposite sides of the second metal plate 8, or the sizes and shapes of the third electrode part 5 and the fourth electrode part 6 can be changed, enabling flexible correspondence according to the positions and situations of the power supply source and the power supply destination.

[0115] In such a distributed constant type noise filter configured as described above, when the third electrode part 5 is connected to the power supply terminal of the second power supply and the fourth electrode part 6 is connected to the second power supply terminal of the electronic component, it is possible to reduce the noise of the voltage supplied from the power supply terminal of the second power supply and supply it to the second power supply terminal of the electronic component.

[0116] Furthermore, as shown in FIG. 16(b), The cathode 2 is connected to a fixed potential such as a ground potential through the bottom surface of the cathode 2, the first cathode terminal 11, the second cathode terminal 12, etc., and functions as a distributed constant type noise filter with a wide frequency band.

[0117] In this way, in the distributed constant type noise filter of the present invention, noise during power supply in two or more types of power supplies can be effectively removed.

[0118] Also, here, by making the dielectric constant of the first dielectric 9 in FIG. 16(b) the same as or different from the dielectric constant of the second dielectric 10, the capacitance of the first capacitor formed by the first metal plate 7 and the capacitance of the second capacitor formed by the second metal plate 8 can be changed, and the impedance characteristics at each frequency can also be changed.

[0119] Furthermore, in FIG. 16(a), consider connecting the first electrode portion 3 and the third electrode portion 5 to the power supply terminals of the same power supply, and connecting the second electrode portion 4 and the fourth electrode portion 6 to the power supply terminals of the same voltage of the same electronic component.

[0120] At this time, a capacitor having the combined capacitance of the first capacitor formed by the first metal plate 7 and the second capacitor formed by the second metal plate 8 is configured. Furthermore, by making the relative dielectric constant of the first dielectric 9 and the relative dielectric constant of the second dielectric 10 different values, it is also possible to obtain improved impedance characteristics at a plurality of specific frequencies and the like.

[0121] Next, a case where the capacitor forming portion of the present invention is rectangular instead of hexagonal and the electrode portions of the metal plates are present in the same layer will be described.

[0122] FIG. 21 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 21(a) is a top view, and FIG. 21(b) is a cross-sectional view taken along line J-J of FIG. 21(a).

[0123] FIG. 22 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 22(a) is a top view, and FIG. 22(b) is a cross-sectional view taken along line K-K of FIG. 22(a).

[0124] FIG. 23 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 23(a) is a top view, and FIG. 23(b) is a cross-sectional view taken along line L-L of FIG. 23(a).

[0125] FIG. 13 is a top view of the cathode and the cathode terminal in one embodiment of the present invention. In FIG. 13, there are a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, and the cathode 2 has a rectangular shape.

[0126] FIG. 24 is in one embodiment of the present invention the first metal plate, the first electrode portion, and the second electrode portion and a top view of the second metal plate, the third electrode portion, and the fourth electrode portion, The first metal plate 7, the first electrode portion 3, the second electrode portion 4, the second metal plate 8, the third electrode portion 5, and the fourth electrode portion 6, The first electrode portion 3 and the second electrode portion 4 are located on the same straight line, and the first metal plate 7 has a rectangular shape, The third electrode portion 5 and the fourth electrode portion 6 are located on the same straight line, and the second metal plate 8 has a rectangular shape.

[0127] At this time, the first metal plate 7 and the second metal plate 8 do not necessarily have to be the same in terms of thickness. Also, the distance between the first metal plate 7 and the second metal plate is desirably more than 10 times the value of the larger thickness of the first metal plate 7 and the second metal plate. This is to prevent the mutual electromagnetic influence between the first metal plate 7 and the second metal plate.

[0128] In the top view of FIG. 21(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0129] Also, in the cross-sectional view of FIG. 21(b), the cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a fifth cathode portion 2e, and a seventh cathode portion 2g, The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via a first dielectric 9. The second metal plate 8 forms a second capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9, The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g, The capacitor forming portion includes a first capacitor and a second capacitor, One end of the cathode 2 has a first cathode terminal 11, and the other end of the cathode 2 has a second cathode terminal 12.

[0130] Next, in the top view of FIG. 22(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0131] Furthermore, in the cross-sectional view of FIG. 22(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9, One end of the first metal plate 7 has a first electrode portion 3, and the other end of the first metal plate 7 has a second electrode portion 4.

[0132] Next, in the top view of FIG. 23(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0133] Furthermore, in the cross-sectional view of FIG. 23(b), The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10, One end of the second metal plate 8 has a third electrode portion 5, and the other end of the second metal plate 8 has a fourth electrode portion 6.

[0134] Here, in FIG. 22(b), The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9, The first capacitor has a transmission line structure called a strip line and forms a distributed constant type noise filter. Also, in FIG. 23(b), The second metal plate 8 forms a second capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9, The second capacitor has a transmission line structure called a strip line and forms a distributed constant type noise filter.

[0135] Here, one protruding part of the first metal plate 7 outside both sides where the first capacitor is formed is the first electrode portion 3, and the other part is the second electrode portion 4. One protruding part of the second metal plate 8 outside both sides where the second capacitor is formed is the third electrode portion 5, and the other part is the fourth electrode portion 6.

[0136] In such a distributed constant type noise filter configured as described above, when the first electrode portion 3 is connected to the power supply terminal of the first power supply and the second electrode portion 4 is connected to the first power supply terminal of the electronic component respectively, it is possible to supply the voltage supplied from the power supply terminal of the first power supply to the first power supply terminal of the electronic component while reducing the noise of the voltage. Furthermore, when the third electrode portion 5 is connected to the power supply terminal of the second power supply and the fourth electrode portion 6 is connected to the second power supply terminal of the electronic component respectively, it is possible to supply the voltage supplied from the power supply terminal of the second power supply to the second power supply terminal of the electronic component while reducing the noise of the voltage.

[0137] Furthermore, as shown in FIG. 21(b), The cathode 2 functions as a distributed constant type noise filter with a wide frequency band by being connected to a fixed potential such as a ground potential through the bottom surface of the cathode 2, the first cathode terminal 11, the second cathode terminal 12, etc.

[0138] Thus, in the distributed constant type noise filter of the present invention, noise during power supply from two or more types of power supplies can be effectively removed.

[0139] At this time, in FIG. 21(a), it is considered to connect the first electrode portion 3 and the third electrode portion 5 to the power supply terminals of the same power supply, and connect the second electrode portion 4 and the fourth electrode portion 6 to the power supply terminals of the same voltage of the same electronic component.

[0140] At this time, a capacitor having a combined capacitance of the first capacitor formed by the first metal plate 7 and the second capacitor formed by the second metal plate 8 is configured, and it is also possible to obtain improved impedance characteristics at each frequency.

[0141] Next, FIG. 25 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention.

[0142] In FIG. 25, the first electrode portion 3 is provided on one side of the first metal plate 7, and the second electrode portion 4 is provided on the other side.

[0143] At this time, the first metal plate 7 forming the distributed constant type noise filter can be formed such that the lengths of both short sides are different.

[0144] Here, let the length of the long short side at one end of the first metal plate 7 be W2, the length of the short short side at the other end be W3, and the shape of the first metal plate 7 be trapezoidal.

[0145] Furthermore, among the two electrode portions protruding from the two short sides of the first metal plate 7, connect the power supply terminal of the power supply to the first electrode portion 3 protruding from the long short side side. Among the two electrode portions protruding from both short sides of the first metal plate 7, connect the power supply terminal of an electronic component such as an LSI to the second electrode portion 4 protruding from the short short side side.

[0146] At this time, the impedance on the long short side of the first metal plate 7 will be smaller than the impedance on the short short side because the line width is wider.

[0147] Here, generally, the impedance on the power supply side is low, and the impedance on the side where power is supplied such as the power supply terminal of the LSI is high. Therefore, due to the trapezoidal shape like the first metal plate 7, the impedance on the load side to which the LSI or the like is connected becomes high, and by matching the impedance, electrical noise can be guided to the distributed constant type noise filter according to the present invention and attenuated easily, and noise in a wider frequency band can be efficiently removed.

[0148] Also, this form can be applied to the second metal plate, and equivalent effects can be expected.

[0149] Next, FIG. 26 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention.

[0150] In FIG. 26, the first metal plate 7 has a first electrode portion 3 on one side and a second electrode portion 4 on the other side.

[0151] As shown in FIG. 26, the shape of the first metal plate 7 forming the distributed constant type noise filter has a constricted region in the approximate center.

[0152] At this time, one or more notches are provided on the long side surface of the first metal plate 7, and a region with a length W4 satisfying W1 > W4 is formed with respect to the length W1 of both short sides of the first metal plate 7.

[0153] Also, the lengths of both short sides of the first metal plate 7 do not have to be equal, and it is sufficient that W4 is smaller than at least the length of either one of both short sides of the first metal plate 7.

[0154] At this time, by adopting a configuration in which one or more notches are formed in the side surface portion on the long side of the first metal plate 7, a difference in impedance is generated in the distributed constant circuit forming portion, and the impedance of the constricted region of the first metal plate 7 becomes smaller than the impedance of other portions of the first metal plate 7, it can be expected that noise in a wider frequency band can be efficiently removed.

[0155] Also, this form can be applied to the second metal plate, and equivalent effects can be expected.

[0156] Next, FIG. 27 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention.

[0157] In FIG. 27, the first metal plate 7 has the first electrode portion 3 on one side and the second electrode portion 4 on the other side.

[0158] As shown in FIG. 27, the shape of the first metal plate 7 forming the distributed constant type noise filter has one or more notches formed in the side surface on the long side, and the first metal plate 7 itself has a zigzag shape in which it is bent.

[0159] At this time, by applying a zigzag shape having one or more bent shapes such as a meandering shape to the first metal plate 7, the line length of the transmission line of the first metal plate 7, that is, the length in the long side direction of the distributed constant circuit forming portion increases, and it can be expected that noise in a wider frequency band can be efficiently removed.

[0160] Also, this form can be applied to the second metal plate, and equivalent effects can be expected.

[0161] Next, FIG. 28 is a top view of the first metal plate, the first electrode portion, the second electrode portion, the second metal plate, the third electrode portion, and the fourth electrode portion in one embodiment of the present invention.

[0162] In FIG. 28, one side of the first metal plate 7 has the first electrode portion 3, and the other side has the second electrode portion 4. One side of the second metal plate 8 has the third electrode portion 5, and the other side has the fourth electrode portion 6.

[0163] Here, as shown in FIG. 28, the shape of the first metal plate 7 forming the distributed constant type noise filter has a recessed region and a protruding region, and is shaped so as to maintain a distance without contacting that region. The shape of the second metal plate 8 has a recessed region and a protruding region.

[0164] In this case, in FIG. 28, the recessed regions and the protruding regions of the first metal plate 7 and the second metal plate 8 are in a semi-circular shape, but other shapes such as polygons may be used, and the areas of the recessed regions and the protruding regions may be different.

[0165] At this time, the impedance of the recessed region of the first metal plate 7 is smaller than the impedance of the protruding region. Similarly, the impedance of the recessed region of the second metal plate 8 is smaller than the impedance of the protruding region, so it is expected that noise in a wider frequency band can be efficiently removed.

[0166] Next, FIG. 29 is a top view and a cross-sectional view in one embodiment of the present invention.

[0167] In the top view of FIG. 29(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, and a second cathode terminal 12.

[0168] Also, in the cross-sectional view of FIG. 29(b), The cathode 2 is formed from a first cathode portion 2a, a second cathode portion 2b, a fifth cathode portion 2e, a seventh cathode portion 2g, and an eighth cathode portion 2h. The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The second metal plate 8 forms a second capacitor with the first cathode portion 2a and the second cathode portion 2b via the second dielectric 10. The first metal plate 7 and the second metal plate 8 are partitioned by the eighth cathode portion 2h. The first cathode portion 2a and the second cathode portion 2b are connected at both ends by the fifth cathode portion 2e and the seventh cathode portion 2g, and are connected at the central portion by the eighth cathode portion 2h. The capacitor forming portion includes the first capacitor and the second capacitor. One end of the cathode 2 has a first cathode terminal 11, and the other end of the cathode 2 has a second cathode terminal 12.

[0169] Thus, in FIG. 29(b), compared with the case of FIG. 21(b), the first metal plate 7 and the second metal plate 8 are partitioned by the eighth cathode portion 2h, so that the first capacitor composed of the first metal plate 7 and the second capacitor composed of the second metal plate 8 can be effectively separated without superimposing electromagnetic noise therebetween.

[0170] Next, FIG. 30 is a top view and a cross-sectional view in one embodiment of the present invention.

[0171] In the top view of FIG. 30(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, and a fourth electrode portion 6.

[0172] Also, in the cross-sectional view of FIG. 30(b), The cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a fifth cathode portion 2e, and a seventh cathode portion 2g. The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The second metal plate 8 forms a second capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The first cathode portion 2a and the second cathode portion 2b are connected at both ends by the fifth cathode portion 2e and the seventh cathode portion 2g. The capacitor forming portion includes a first capacitor and a second capacitor. At the end of the cathode 2, there is no cathode terminal at the end of the cathode.

[0173] Thus, in FIG. 30(b), compared with the case of FIG. 21(b), since there is no cathode terminal at the end of the cathode, it is possible to reduce the mounting area when mounting on a printed wiring board or the like. Also, by arranging solder balls such as those of a BGA on the bottom surface of the first cathode portion 2a, it is possible to easily mount the first cathode portion 2a on the metal terminal of the printed wiring board.

[0174] Next, FIG. 31 is a top view and a cross-sectional view in an embodiment of the present invention. FIG. 31(a) is a top view, and FIG. 31(b) is an O-O cross-sectional view of FIG. 31(a).

[0175] In the top view of FIG. 31(a), the distributed constant type noise filter of the present invention has a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a fifth electrode portion 19, a sixth electrode portion 20, a first cathode terminal 11, and a second cathode terminal 12.

[0176] Also, in the cross-sectional view of FIG. 31(b), The cathode 2 is formed by a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, a seventh cathode portion 2g, a ninth cathode portion 2i, a tenth cathode portion 2j, and an eleventh cathode portion 2k. The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g. The second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f. The third metal plate 21 forms a third capacitor with the third cathode portion 2c and the ninth cathode portion 2i via the fourth dielectric 22. The third cathode portion 2c and the ninth cathode portion 2i are connected by the tenth cathode portion 2j and the eleventh cathode portion 2k. The capacitor forming portion includes a first capacitor, a second capacitor, and a third capacitor. One end of the cathode 2 has a first cathode terminal 11, and the other end of the cathode 2 has a second cathode terminal 12.

[0177] Also, in FIG. 31, the mechanism of the first capacitor formed by the first metal plate 7, the second capacitor formed by the second metal plate 8, and the third capacitor formed by the third metal plate 21 is the same as that in FIGS. 1 to 6, and each capacitor forms a distributed constant type noise filter.

[0178] As described with reference to FIG. 31, by changing the polygon in FIG. 1(a) from a hexagon to an octagon and increasing the number of capacitor layers in FIG. 1(b) from two layers to three layers, in the distributed constant type noise filter of the present invention, it is possible to effectively remove the noise during power supply for three types of power supplies.

[0179] Also, here, in FIG. 31(a), the case where the capacitor forming portion 1 and the cathode 2 are octagons has been described, but it is also possible to make them polygons with more sides than octagons. Further, by increasing the number of capacitor layers in FIG. 31(b), more capacitors formed by metal plates can be formed, and it is also possible to effectively remove the noise during power supply for more types of power supplies.

[0180] Next, FIG. 32 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 32(a) is the top view, and FIG. 32(b) is a cross-sectional view taken along line P-P of FIG. 32(a).

[0181] Also, FIG. 33 is a top view and a cross-sectional view in one embodiment of the present invention. FIG. 33(a) is the top view, and FIG. 33(b) is a cross-sectional view taken along line Q-Q of FIG. 33(a).

[0182] In the top view of FIG. 32(a), the distributed constant type noise filter of the present invention includes a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, a second cathode terminal 12, a third cathode terminal 23, and a fourth cathode terminal 24.

[0183] Also, in the cross-sectional view of FIG. 32(b), the cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, and a seventh cathode portion 2g, the first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9, the first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g, the second metal plate 8 forms a second capacitor with the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10, the second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f, the capacitor forming portion includes the first capacitor and the second capacitor, one end of the cathode 2 has the first cathode terminal 11, and the other end of the cathode 2 has the second cathode terminal 12.

[0184] Also, in the top view of FIG. 33(a), the distributed constant type noise filter of the present invention includes a capacitor forming portion 1, a cathode 2, a first electrode portion 3, a second electrode portion 4, a third electrode portion 5, a fourth electrode portion 6, a first cathode terminal 11, a second cathode terminal 12, a third cathode terminal 23, and a fourth cathode terminal 24.

[0185] Also, in the cross-sectional view of FIG. 33(b), the cathode 2 is formed of a first cathode portion 2a, a second cathode portion 2b, a third cathode portion 2c, a fourth cathode portion 2d, a fifth cathode portion 2e, a sixth cathode portion 2f, and a seventh cathode portion 2g. The first metal plate 7 forms a first capacitor by the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The first cathode portion 2a and the second cathode portion 2b are connected by the fifth cathode portion 2e and the seventh cathode portion 2g. The second metal plate 8 forms a second capacitor by the second cathode portion 2b and the third cathode portion 2c via the second dielectric 10. The second cathode portion 2b and the third cathode portion 2c are connected by the fourth cathode portion 2d and the sixth cathode portion 2f. The capacitor forming portion includes a first capacitor and a second capacitor. One end of the cathode 2 has a third cathode terminal 23, and the other end of the cathode 2 has a fourth cathode terminal 24.

[0186] Also, the mechanism of the first capacitor formed by the first metal plate 7 and the second capacitor formed by the second metal plate 8 is equivalent to that of FIG. 31, and each capacitor forms a distributed constant type noise filter.

[0187] At this time, as shown in FIGS. 32(a) and 33(a), by having four cathode terminals, namely, the first cathode terminal 11, the second cathode terminal 12, the third cathode terminal 23, and the fourth cathode terminal 24, in four directions, it becomes possible to further stabilize the potential of the cathode, and the characteristics of the distributed constant type noise filter also become stable.

[0188] Next, FIG. 34 is a top view of the cathode and the cathode terminal in one embodiment of the present invention. In FIG. 34, in the structure of FIG. 31, it has a cathode 2, a first cathode terminal 11, and a second cathode terminal 12, and the cathode 2 has an octagonal shape.

[0189] Next, FIG. 35 is a top view of the cathode and the cathode terminal in one embodiment of the present invention. In FIG. 35, in the structures of FIGS. 32 and 33, it has a cathode 2, a first cathode terminal 11, a second cathode terminal 12, a third cathode terminal 23, and a fourth cathode terminal 24, and the cathode 2 has an octagonal shape.

[0190] Next, FIG. 36 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention. In FIG. 36, in the structures of FIGS. 31 to 33, it has a first metal plate 7, a first electrode portion 3, and a second electrode portion 4, and the first metal plate has an octagonal shape.

[0191] Here, FIG. 36 shows a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention. The top view of the second metal plate, the third electrode portion, and the fourth electrode portion in the structures of FIGS. 31 to 33 can also have a structure equivalent to that of FIG. 36. Also, the top view of the third metal plate, the fifth electrode portion, and the sixth electrode portion in the structure of FIG. 31 can also have a structure equivalent to that of FIG. 36.

[0192] Next, FIG. 37 is a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention. In FIG. 37, in the structures of FIGS. 31 to 33, it has a first metal plate 7, a first electrode portion 3, and a second electrode portion 4, and the first metal plate has a rectangular shape.

[0193] Here, FIG. 37 shows a top view of the first metal plate, the first electrode portion, and the second electrode portion in one embodiment of the present invention. In the structures of FIGS. 31 to 33, the top views of the second metal plate, the third electrode portion, and the fourth electrode portion can also have the same structure as that of FIG. 36. Also, in the structure of FIG. 31, the top view of the third metal plate, the fifth electrode portion, and the sixth electrode portion can also have the same structure as that of FIG. 36.

[0194] Next, FIG. 38 is a cross-sectional view of the cathode partition portion in one embodiment of the present invention.

[0195] In FIG. 29(b), the first metal plate 7 and the second metal plate 8 were partitioned by the eighth cathode portion 2h, but in FIG. 38(a), the cathode 2 is formed from the first cathode portion 2a, the second cathode portion 2b, the fifth cathode portion 2e, and the seventh cathode portion 2g. The first metal plate 7 forms a first capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The second metal plate 8 forms a second capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The second cathode portion 2b has a first cathode partition portion 25 on the side of the first dielectric 9. The first cathode portion 2a and the second cathode portion 2b are connected at both ends by the fifth cathode portion 2e and the seventh cathode portion 2g. The capacitor forming portion includes the first capacitor and the second capacitor. One end of the cathode 2 has a first cathode terminal 11, and the other end of the cathode 2 has a second cathode terminal 12.

[0196] At this time, the first cathode partition portion 25 can effectively separate the electromagnetic noise between the first capacitor composed of the first metal plate 7 and the second capacitor composed of the second metal plate 8 without superimposing it.

[0197] Also, in FIG. 38(b), The cathode 2 is formed from a first cathode part 2a, a second cathode part 2b, a fifth cathode part 2e, and a seventh cathode part 2g. The first metal plate 7 forms a first capacitor with the first cathode part 2a and the second cathode part 2b via the first dielectric 9. The second metal plate 8 forms a second capacitor with the first cathode part 2a and the second cathode part 2b via the first dielectric 9. The second cathode part 2b has a first cathode partition part 25 on the side of the first dielectric 9. The first cathode part 2a has a second cathode partition part 26 on the side of the first dielectric 9. The first cathode part 2a and the second cathode part 2b are connected at both ends by the fifth cathode part 2e and the seventh cathode part 2g. The capacitor forming part includes a first capacitor and a second capacitor. One end of the cathode 2 has a first cathode terminal 11, and the other end of the cathode 2 has a second cathode terminal 12.

[0198] At this time, when the directions of the first cathode terminal 11 and the second cathode terminal 12 are in the X-axis direction, the first cathode partition part 25 and the second cathode partition part 26 are arranged at different positions in the X-axis direction, and the electromagnetic noise between the first capacitor composed of the first metal plate 7 and the second capacitor composed of the second metal plate 8 can be effectively separated without superposition.

[0199] In this case, in the X-axis direction, even if the positional accuracy of generating the first cathode partition part 25 and the second cathode partition part 26 is not more precise, the effect is high, and further, there is an effect that the manufacturing becomes simpler.

[0200] Also, in Fig. 38(c), The cathode 2 is formed from a first cathode part 2a, a second cathode part 2b, a fifth cathode part 2e, and a seventh cathode part 2g. The first metal plate 7 forms a first capacitor with the first cathode part 2a and the second cathode part 2b via the first dielectric 9. The second metal plate 8 forms a second capacitor with the first cathode portion 2a and the second cathode portion 2b via the first dielectric 9. The second cathode portion 2b has a first cathode partition portion 25 on the side of the first dielectric 9. The first cathode portion 2a has a second cathode partition portion 26 on the side of the first dielectric 9. The first cathode portion 2a and the second cathode portion 2b are connected at both ends by a fifth cathode portion 2e and a seventh cathode portion 2g. The capacitor forming portion includes a first capacitor and a second capacitor. One end of the cathode 2 has a first cathode terminal 11, and the other end of the cathode 2 has a second cathode terminal 12.

[0201] At this time, when the directions of the first cathode terminal 11 and the second cathode terminal 12 are taken as the X-axis direction, the first cathode partition portion 25 and the second cathode partition portion 26 are arranged at the same position in the X-axis direction, and the electromagnetic noise between the first capacitor composed of the first metal plate 7 and the second capacitor composed of the second metal plate 8 can be effectively separated without being superimposed.

[0202] In addition, the application range of the distributed constant type noise filter of the present invention can be mounted not only on a conventional printed wiring board but also on an LSI or a chiplet.

[0203] As described above, the distributed constant type noise filter of the present invention has been described with examples, but A distributed constant type noise filter connectable to two power supplies, A first capacitor portion having a first cathode portion, a second cathode portion, and a first metal plate disposed between the first cathode portion and the second cathode portion via a dielectric and extending in a first direction, A second capacitor portion laminated on the first capacitor portion, having a second metal plate disposed between the second cathode portion and the third cathode portion via a dielectric and extending in a second direction, The first capacitor section has a first electrode section and a second electrode section on both end sides in the first direction. The second capacitor section has a third electrode section and a fourth electrode section on both end sides in the second direction. The first capacitor section is connected to one power supply, and the second capacitor section is connected to the other power supply. The first direction and the second direction intersect each other at a predetermined angle. As a result, it is possible to effectively remove the noise of two or more types of power supplies. When performing power supply decoupling of a high-speed operating LSI that requires two or more types of power supplies, it is not necessary to mount a plurality of different types of capacitors, such as aluminum electrolytic capacitors, tantalum capacitors, and ceramic capacitors, having different self-resonant frequencies. It becomes possible to handle with fewer components, leading to a reduction in the number of components, a reduction in the component area, and a reduction in the cost and time of component mounting, contributing to the IT industry. Furthermore, since it also leads to a reduction in CO2, it can contribute to the SDGs.

Industrial Applicability

[0204] In the distributed constant type noise filter of the present invention, it is possible to effectively remove the noise of two or more types of power supplies. When performing power supply decoupling of a high-speed operating LSI that requires two or more types of power supplies, it is not necessary to mount a plurality of different types of capacitors, such as aluminum electrolytic capacitors, tantalum capacitors, and ceramic capacitors, having different self-resonant frequencies. It becomes possible to handle with fewer components, leading to a reduction in the number of components, a reduction in the component area, and a reduction in the cost and time of component mounting, contributing to the IT industry. Furthermore, since it also leads to a reduction in CO2, it can contribute to the SDGs.

Explanation of Signs

[0205] 1... Capacitor forming section 2... Cathode 2a... First cathode section 2b ··· The second cathode part 2c ··· The third cathode part 2d ··· The fourth cathode part 2e ··· The fifth cathode part 2f ··· The sixth cathode part 2g ··· The seventh cathode part 2h ··· The eighth cathode part 2i ··· The ninth cathode part 2j ··· The tenth cathode part 2k ··· The eleventh cathode part 3 ··· The first electrode part 4 ··· The second electrode part 5 ··· The third electrode part 6 ··· The fourth electrode part 7 ··· The first metal plate 8 ··· The second metal plate 9 ··· The first dielectric 10 ··· The second dielectric 11 ··· The first cathode terminal 12 ··· The second cathode terminal 13 ··· Metal plate 14 ··· Oxide film 15 ··· Solid electrolyte layer such as conductive polymer 16 ··· Graphite and silver paste layer 17 ··· The third dielectric 18 ··· Metal plate at GND potential 19 ··· The fifth electrode part 20 ··· The sixth electrode part 21 ··· The third metal plate 22 ··· The fourth dielectric 23 ··· The third cathode terminal 24 ··· The fourth cathode terminal 25 ··· The first cathode partition part 26 ··· The second cathode partition part

Claims

1. A distributed constant type noise filter that can be connected to two power sources, a first capacitor portion having a first metal plate disposed between the first cathode portion and the second cathode portion via a dielectric and extending in a first direction; a second capacitor section that is stacked on the first capacitor section, is disposed between the second cathode section and the third cathode section via a dielectric, and has a second metal plate extending in the second direction; the first capacitor portion has a first electrode portion and a second electrode portion on both ends in the first direction, the second capacitor portion has a third electrode portion and a fourth electrode portion on both ends in the second direction, the first capacitor unit is connected to one power supply and the second capacitor unit is connected to the other power supply; The distributed constant type noise filter, wherein the first direction and the second direction intersect with each other at a predetermined angle.

2. The first cathode part and the second cathode part are connected by a fifth cathode part.

2. The distributed constant type noise filter according to claim 1.

3. The first cathode portion has a solder ball on its bottom surface.

2. The distributed constant type noise filter according to claim 1.

4. The surface of the first metal plate is included in the surfaces of the first cathode portion and the second cathode portion when viewed from above.

2. The distributed constant type noise filter according to claim 1.

5. The first cathode portion, the second cathode portion, and the third cathode portion are each shaped like a rectangle.

2. The distributed constant type noise filter according to claim 1.

6. The first cathode portion, the second cathode portion, and the third cathode portion are each hexagonal in shape.

2. The distributed constant type noise filter according to claim 1.

7. The first cathode portion, the second cathode portion, and the third cathode portion are each elliptical in shape.

2. The distributed constant type noise filter according to claim 1.

8. A distributed constant type noise filter that can be connected to two power sources, a first capacitor portion having a first metal plate disposed between the first cathode portion and the second cathode portion via a dielectric and extending in a first direction; a first cathode portion, a second cathode portion, and a second capacitor portion disposed between the first cathode portion and the second cathode portion via a dielectric and having a second metal plate extending in a first direction; the first capacitor portion has a first electrode portion and a second electrode portion on both ends in the first direction, the second capacitor portion has a third electrode portion and a fourth electrode portion on both ends in the first direction, the first capacitor unit is connected to one power supply and the second capacitor unit is connected to the other power supply; a protrusion from the first cathode portion is provided between the first metal plate and the second metal plate on the dielectric side of the first cathode portion. Distributed constant type noise filter.

9. a protrusion from the second cathode portion is provided between the first metal plate and the second metal plate on the dielectric side of the second cathode portion.

9. The distributed constant type noise filter according to claim 8.

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