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WO2017199749A1 - Filtre lc stratifié - Google Patents

Filtre lc stratifié Download PDF

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Publication number
WO2017199749A1
WO2017199749A1 PCT/JP2017/017130 JP2017017130W WO2017199749A1 WO 2017199749 A1 WO2017199749 A1 WO 2017199749A1 JP 2017017130 W JP2017017130 W JP 2017017130W WO 2017199749 A1 WO2017199749 A1 WO 2017199749A1
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Prior art keywords
inductor
electrode
resonator
filter
parallel resonator
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PCT/JP2017/017130
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English (en)
Japanese (ja)
Inventor
登 塩川
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/075—Ladder networks, e.g. electric wave filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/09—Filters comprising mutual inductance

Definitions

  • the present invention relates to a multilayer LC filter. More specifically, the present invention relates to a small-sized multilayer LC in which an attenuation pole having a sufficient attenuation is formed in the vicinity of a passband and impedance matching between input and output is achieved. Regarding filters.
  • An LC filter that forms a circuit network with inductors and capacitors on a signal line connecting an input terminal and an output terminal and allows only a signal having a desired frequency to pass through is widely used in electronic circuits.
  • Patent Document 1 Japanese Patent Publication No. 2008-529360 discloses such an LC filter.
  • FIG. 11 and 12 show the LC filter 1000 disclosed in Patent Document 1.
  • FIG. 11 is an equivalent circuit diagram of the LC filter 1000.
  • FIG. 12 is a plan view of the LC filter 1000.
  • the LC filter 1000 includes an input terminal (input node) 101 and an output terminal (output node) 102.
  • the LC filter 1000 includes an LC parallel resonator 103 in which an inductor L01 and a capacitor C01 are connected in parallel between an input terminal 101 and an output terminal 102, an inductor L03, an inductor L05, and an inductor L06 in this order. Connected in series.
  • a capacitor C03 is connected in parallel with the LC parallel resonator 103, the inductor L03, and the inductor L05 connected in series.
  • the LC filter 1000 includes an LC series resonator 104 in which a capacitor C02 and an inductor L02 are connected in series between a connection point between the input terminal 101, the LC parallel resonator 103 and the capacitor C03, and the ground. It is connected. Further, an LC series resonator 105 in which an inductor L04 and a capacitor C04 are connected in series is connected between a connection point of the inductor L03 and the inductor L05 and the ground. Each of the LC series resonators 104 and 105 plays a role of forming an attenuation pole in the vicinity of the pass band of the LC filter 1000.
  • the LC filter 1000 has symmetry between the input and output because the LC series resonator 105 is connected between the connection point of the inductor L03 and the inductor L05 located substantially at the center of the signal line and the ground. It has an advantage that impedance matching between input and output is relatively easy.
  • the LC filter 1000 is relatively easy to match the impedance between the input and output. However, if the impedance needs to be adjusted with higher accuracy, a new matching capacitor or inductor is added. There was a case that had to be added to. In this case, the LC filter 1000 has a problem that the size becomes large.
  • the size of the inductor electrode constituting the inductor is increased instead of a method of newly adding a matching inductor.
  • the inductor electrode of the inductor L04 is configured to expand only in the plane direction.
  • the inductor electrode of the inductor L04 has to be increased in the plane direction, and the size of the LC filter 1000 in the plane direction is increased.
  • the laminated LC filter of the present invention includes a laminate in which a plurality of dielectric layers are laminated, and an interlayer between the laminates.
  • the series resonator inductor and the LC series resonator capacitor are connected in series, and one of the two LC parallel resonator split inductors and the LC series resonator inductor branch between one layer of the multilayer body. And when the laminated body is seen through in the laminating direction and one split inductor for LC parallel resonator and one inductor for LC series resonator are viewed, the inside of the spiral pattern constituted by the inductor electrode of one inductor The winding axis of the other inductor is arranged.
  • the LC series resonator may be connected to the ground via another element or circuit.
  • the winding axis of one inductor may be arranged inside the spiral pattern constituted by the inductor electrode of the other inductor. In this case, the magnetic coupling between one inductor and the other inductor can be made stronger.
  • the winding direction of the spiral pattern constituted by the inductor electrode of one inductor and the winding direction of the spiral pattern constituted by the inductor electrode of the other inductor can be reversed. In this case, adjustment can be made so that the magnetic coupling between one inductor and the other inductor is strong.
  • the winding direction of the spiral pattern constituted by the inductor electrode of one inductor and the winding direction of the spiral pattern constituted by the inductor electrode of the other inductor can be made the same direction. In this case, adjustment can be made so that the magnetic coupling between one inductor and the other inductor becomes weak.
  • the inductance value of one LC parallel resonator split inductor branched from the LC series resonator inductor in one layer of the laminate is the other LC parallel resonator split inductor inductance value.
  • the inductance value of the magnetically coupled LC series resonator inductor can be increased by the other LC parallel resonator split inductor.
  • At least one capacitor may be further connected to at least one of the signal line connecting the input terminal and the LC parallel resonator and the signal line connecting the LC parallel resonator and the output terminal. In this case, the impedance between the input and output can be adjusted by the capacitor.
  • An impedance matching LC circuit may be further connected to at least one of a signal line connecting the input terminal and the LC parallel resonator and a signal line connecting the LC parallel resonator and the output terminal.
  • the impedance between the input and output can be further adjusted by the impedance matching LC circuit.
  • the impedance matching LC circuit for example, an LC parallel resonator can be connected.
  • Another LC series resonator is connected between at least one of the signal line connecting the input terminal and the LC parallel resonator, and the signal line connecting the LC parallel resonator and the output terminal, and the ground. Also good.
  • an attenuation pole can be formed in the vicinity of the pass band by the LC series resonator.
  • the LC series resonator is connected between the connection point of the two split inductors for the LC parallel resonator located substantially in the center of the signal line and the ground. Furthermore, one LC parallel resonator split inductor branched from the LC series resonator inductor in one layer of the multilayer body is magnetically coupled to the LC series resonator inductor. Therefore, the multilayer LC filter of the present invention can adjust the impedance by increasing or decreasing the magnetic coupling, so that no matching inductor or capacitor is added to achieve impedance matching. Alternatively, impedance matching can be achieved by adding a small amount of matching inductors and capacitors.
  • FIG. 1 is a perspective view of a multilayer LC filter 100 according to a first embodiment.
  • 2 is an exploded perspective view of a multilayer LC filter 100.
  • FIG. 3 is an equivalent circuit diagram of the multilayer LC filter 100.
  • FIG. 4A is an equivalent circuit diagram showing a preferred LC filter X used in the simulation experiment.
  • FIG. 4B is a characteristic diagram of the LC filter X.
  • FIG. 5A is an equivalent circuit diagram showing an LC filter Y for comparison used in the simulation experiment.
  • FIG. 5B is a characteristic diagram of the LC filter Y.
  • 3 is an exploded perspective view of a main part of the multilayer LC filter 100.
  • FIG. 5 is a graph showing frequency characteristics of the multilayer LC filter 1100.
  • FIG. 5 is a graph showing frequency characteristics of the multilayer LC filter 200.
  • FIG. 6 is an equivalent circuit diagram of an LC filter 1000 disclosed in Patent Document 1.
  • FIG. 2 is a plan view of an LC filter 1000.
  • each embodiment shows an embodiment of the present invention by way of example, and the present invention is not limited to the content of the embodiment. Moreover, it is also possible to implement combining the content described in different embodiment, and the implementation content in that case is also included in this invention. Further, the drawings are for helping understanding of the embodiment, and may not be drawn strictly. For example, a drawn component or a dimensional ratio between the components may not match the dimensional ratio described in the specification. In addition, the constituent elements described in the specification may be omitted in the drawings or may be drawn with the number omitted.
  • FIG. 1 is a perspective view
  • FIG. 2 is an exploded perspective view
  • FIG. 3 is an equivalent circuit diagram.
  • the laminated LC filter 100 includes a rectangular parallelepiped laminated body 1 made of ceramic, for example, as shown in FIG. That is, the laminate 1 includes an upper main surface, a lower main surface, a pair of end surfaces and a pair of side surfaces that connect the two main surfaces.
  • the end face is a face located on the short side when viewed in the plane direction.
  • the side surface is a surface located on the long side when viewed in the planar direction.
  • An input terminal 2 is formed on one end face of the laminate 1, and an output terminal 3 is formed on the other end face.
  • a pair of ground terminals 4a and 4b are formed on both side surfaces of the laminate 1.
  • the input terminal 2, the output terminal 3, and the ground terminals 4a and 4b are formed to extend to the lower main surface and the upper main surface of the multilayer body 1, respectively.
  • the input terminal 2, the output terminal 3, and the ground terminals 4a and 4b can be formed of, for example, a metal whose main component is Ag, Cu, or an alloy thereof.
  • a plating layer mainly composed of Ni, Sn, Au or the like may be formed over one layer or a plurality of layers as necessary.
  • the multilayer body 1 has a structure in which dielectric layers 1a to 1r are sequentially laminated from the bottom.
  • capacitor electrodes 5a to 5h Between the dielectric layers 1a to 1r, capacitor electrodes 5a to 5h, relay electrodes 6a to 6n, inductor electrodes 7a to 7k, and extraction electrodes 8a are formed. Also, via electrodes 9a to 9p are formed through the dielectric layers 1b to 1q.
  • the relay electrodes 6a to 6n are electrodes for ensuring the connection between the via conductor provided in the upper dielectric layer and the via electrode provided in the lower dielectric layer.
  • the extraction electrode 8a is an electrode for connecting to a terminal.
  • the capacitor electrodes 5a to 5h, the relay electrodes 6a to 6n, the inductor electrodes 7a to 7k, and the extraction electrode 8a formed on the dielectric layers will be described for each of the dielectric layers 1a to 1r.
  • the input terminal 2, the output terminal 3, and the ground terminals 4a and 4b formed in the dielectric layer will be described.
  • An input terminal 2 is formed on one end face of the dielectric layer 1a, and an output terminal 3 is formed on the other end face.
  • a pair of ground terminals 4a and 4b are formed on both side surfaces of the dielectric layer 1a.
  • the input terminal 2, the output terminal 3, and the ground terminals 4a and 4b are each formed to extend to the lower main surface of the dielectric layer 1a.
  • a capacitor electrode 5a is formed on the upper main surface of the dielectric layer 1a.
  • the capacitor electrode 5a also has a function as a ground electrode.
  • the capacitor electrode 5a is connected to the ground terminals 4a and 4b.
  • a capacitor electrode 5b is formed on the upper main surface of the dielectric layer 1b.
  • a capacitor electrode 5c and a relay electrode 6a are formed on the upper main surface of the dielectric layer 1c.
  • a relay electrode 6b and an inductor electrode 7a are formed on the upper main surface of the dielectric layer 1d.
  • Relay electrodes 6c and 6d and an extraction electrode 8a are formed on the upper main surface of the dielectric layer 1e.
  • the extraction electrode 8 a is connected to the output terminal 3.
  • Relay electrodes 6e and 6f and an inductor electrode 7b are formed on the upper main surface of the dielectric layer 1f.
  • a relay electrode 6g and an inductor electrode 7c are formed on the upper main surface of the dielectric layer 1g.
  • Inductor electrodes 7d and 7e are formed on the upper main surface of the dielectric layer 1h.
  • Inductor electrodes 7f and 7g are formed on the upper main surface of the dielectric layer 1i.
  • Inductor electrodes 7h and 7i are formed on the upper main surface of the dielectric layer 1j.
  • An inductor electrode 7j and a relay electrode 6h are formed on the upper main surface of the dielectric layer 1k.
  • An inductor electrode 7k and a relay electrode 6i are formed on the upper main surface of the dielectric layer 1l.
  • Relay electrodes 6j and 6k and a capacitor electrode 5d are formed on the upper main surface of the dielectric layer 1m.
  • the capacitor electrode 5 d is connected to the output terminal 3.
  • a relay electrode 61 and a capacitor electrode 5e are formed on the upper main surface of the dielectric layer 1n.
  • a relay electrode 6m and a capacitor electrode 5f are formed on the upper main surface of the dielectric layer 1o.
  • a relay electrode 6n and a capacitor electrode 5g are formed on the upper main surface of the dielectric layer 1p.
  • the capacitor electrode 5 g is connected to the input terminal 2.
  • a capacitor electrode 5h is formed on the upper main surface of the dielectric layer 1q.
  • An input terminal 2 is formed on one end face of the dielectric layer 1r, and an output terminal 3 is formed on the other end face.
  • a pair of ground terminals 4a and 4b are formed on both side surfaces of the dielectric layer 1a.
  • the input terminal 2, the output terminal 3, and the ground terminals 4a and 4b are each formed to extend to the upper main surface of the dielectric layer 1a.
  • the via electrode 9a connects the capacitor electrode 5b and the relay electrode 6a.
  • the via electrode 9b connects the capacitor electrode 5c and one end of the inductor electrode 7a.
  • the via electrode 9c connects the extraction electrode 8a and one end of the inductor electrode 7b.
  • the via electrode 9d connects the other end of the inductor electrode 7b and one end of the inductor electrode 7c.
  • the via electrode 9e connects the other end of the inductor electrode 7a and the other end of the inductor electrode 7c via the relay electrodes 6d and 6f.
  • the via electrode 9f connects the relay electrode 6a and one end of the inductor electrode 7d via the relay electrodes 6b, 6c, 6e, and 6g.
  • the via electrode 9g connects the branch point X provided in the middle of the inductor electrode 7c and one end of the inductor electrode 7e.
  • the via electrode 9h connects the other end of the inductor electrode 7d and one end of the inductor electrode 7f.
  • the via electrode 9i connects the other end of the inductor electrode 7e and one end of the inductor electrode 7g.
  • the via electrode 9j connects the other end of the inductor electrode 7f and one end of the inductor electrode 7h.
  • the via electrode 9k connects the other end of the inductor electrode 7g and one end of the inductor electrode 7i.
  • the via electrode 9l connects the other end of the inductor electrode 7h and one end of the inductor electrode 7j.
  • the via electrode 9m connects the other end of the inductor electrode 7j and one end of the inductor electrode 7k.
  • the via electrode 9n connects the other end of the inductor electrode 7i and the capacitor electrode 5e via the relay electrodes 6h, 6i, 6k.
  • the via electrode 9o connects the capacitor electrode 5e and the capacitor electrode 5f.
  • the via electrode 9p connects the other end of the inductor electrode 7k and the capacitor electrode 5h via the relay electrodes 6j, 6l, 6m, and 6n.
  • the capacitor electrodes 5a to 5h, the relay electrodes 6a to 6n, the inductor electrodes 7a to 7k, and the extraction electrode 8a can be formed of, for example, Ag, Cu, or a metal mainly composed of these alloys.
  • the multilayer LC filter 100 according to the first embodiment having the above structure can be manufactured by a general manufacturing method conventionally used for manufacturing a multilayer LC filter.
  • the multilayer LC filter 100 according to the first embodiment having the above structure has an equivalent circuit shown in FIG.
  • a capacitor C1 In the laminated LC filter 100, a capacitor C1, a capacitor C2, and an LC parallel resonator LC1 are sequentially connected to a signal line connecting the input terminal 2 and the output terminal 3.
  • the LC parallel resonator LC1 is configured by connecting in parallel two LC parallel resonator split inductors L2 and L3 and an LC parallel resonator capacitor C4.
  • the term “divided inductor” originally functions even with a single inductor, but is intentionally divided into a plurality of inductors (L 2, L 3).
  • the LC parallel resonator LC1 mainly plays a role of forming a high-frequency attenuation pole.
  • the capacitors C1 and C2 mainly play a role of matching impedance between the input and output of the multilayer LC filter 100, respectively.
  • the multilayer LC filter 100 includes an LC series resonator LC2 in which an LC series resonator inductor L1 and an LC series resonator capacitor C3 are connected in series between a connection point between the capacitor C1 and the capacitor C2 and the ground. It is connected.
  • the LC series resonator LC2 plays a role of forming a low-frequency attenuation pole as a high-pass filter.
  • the multilayer LC filter 100 includes a connection point between the LC parallel resonator split inductor L2 and the LC parallel resonator split inductor L3, and a connection point between the LC series resonator inductor L1 and the LC series resonator capacitor C3.
  • An LC series resonator LC3 in which an inductor L4 for LC series resonator and a capacitor C5 for LC series resonator are connected in series is connected. It can be said that the LC series resonator LC3 is connected to the ground via the LC series resonator capacitor C3.
  • the LC series resonator LC3 plays a role of forming an attenuation pole on a higher frequency side than the attenuation pole formed by the LC parallel resonator LC1.
  • the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 are magnetically coupled.
  • an LC series resonator LC3 (an LC series resonator inductor L4 and an LC series resonator capacitor C5) is connected to a connection point between the LC parallel resonator split inductor L2 and the LC parallel resonator split inductor L3. Therefore, it is excellent in symmetry between input and output, and it is easy to match impedance between input and output.
  • the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 are magnetically coupled, and the LC parallel resonator split inductor L3 strengthens the inductance value of the LC series resonator inductor L4. ing. Therefore, the inductance value of the LC series resonator inductor L4 can be increased without increasing the inductor electrode of the LC series resonator inductor L4.
  • the present inventor conducted the following simulation experiment in order to confirm the effect of the multilayer LC filter 100 described above.
  • a preferred LC filter X whose equivalent circuit is shown in FIG. 4A and an LC filter Y for comparison whose equivalent circuit is shown in FIG. 4A
  • the preferred LC filter X has an equivalent circuit close to the multilayer LC filter 100 according to the first embodiment, as shown in FIG. That is, in the LC filter X, the LC parallel resonator LC1 is connected to a signal line connecting the input terminal 2 and the output terminal 3.
  • the LC series resonator inductor L4 and the LC series resonator capacitor C5 are connected between the connection point of the LC parallel resonator split inductor L2 and the LC parallel resonator split inductor L3 of the LC parallel resonator LC1 and the ground.
  • An LC series resonator LC3 connected in series is connected.
  • the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 are magnetically coupled.
  • the LC filter Y for comparison is for the LC series resonator between the connection point between the LC parallel resonator split inductor L3 and the output terminal 3, and the ground.
  • An LC series resonator LC13 in which an inductor L14 and an LC series resonator capacitor C15 are connected in series is connected.
  • the LC parallel resonator split inductor L3 and the LC series resonator inductor L14 are not magnetically coupled.
  • Table 1 compares the inductance value of the main inductor of the LC filter X and the inductance value of the main inductor of the LC filter Y.
  • the inductor L4 for the LC series resonator of the LC filter X and the inductor L14 for the LC series resonator of the LC filter Y have greatly different inductance values. Specifically, the inductance value of the LC series resonator inductor L4 is 0.4 nH, whereas the inductance value of the LC series resonator inductor L14 is 1.0 nH. In the LC filter Y, the LC parallel resonator split inductor L3 and the LC series resonator inductor L14 are hardly magnetically coupled.
  • the inductance value of the series resonator inductor L14 had to be increased to 1.0 nH.
  • the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 are magnetically coupled, and the LC parallel resonator split inductor L3 strengthens the inductance value of the LC series resonator inductor L4. Therefore, the inductance value of the LC series resonator inductor L4 can be reduced.
  • FIG. 4 (B) shows the frequency characteristics of the LC filter X.
  • FIG. 5B shows frequency characteristics of the LC filter Y.
  • the preferred LC filter X has an attenuation pole having a predetermined attenuation in the vicinity of the pass band, and impedance matching between the input and output is achieved.
  • the LC filter Y for comparison has an attenuation pole having a predetermined attenuation amount in the vicinity of the pass band. Is not removed. This is considered to be because the LC series resonator LC13 is connected between the connection point between the LC parallel resonator split inductor L3 and the output terminal 3 and the ground.
  • the LC filter Y has to increase the inductance value of the inductor L14 for the LC series resonator. For example, when the LC filter Y is configured as a multilayer LC filter, the shape of the LC filter Y increases. is doing.
  • the capacitor C1 is mainly composed of a capacitance formed between the capacitor electrode 5g and the capacitor electrode 5h.
  • the capacitor electrode 5g is connected to the input terminal 2.
  • the capacitor C2 is mainly composed of a capacitance formed between the capacitor electrode 5h and the capacitor electrode 5f.
  • the LC parallel resonator capacitor C4 is mainly composed of a capacitor formed between the capacitor electrode 5e and the capacitor electrode 5d.
  • the capacitor electrode 5e is connected to the capacitor electrode 5f of the capacitor C2 via the via electrode 9o. Further, the capacitor electrode 5d is connected to the output terminal 3.
  • the split inductor L2 for the LC parallel resonator is composed of a line connecting the via electrode 9n, the inductor electrode 7i, the via electrode 9k, the inductor electrode 7g, the via electrode 9i, the inductor electrode 7e, and the via electrode 9g.
  • the via electrode 9n is connected to the capacitor electrode 5e of the LC parallel resonator capacitor C4.
  • the via electrode 9n passes through the relay electrodes 6k, 6i, and 6h on the way.
  • the via electrode 9g is connected to the branch point X of the inductor electrode 7c.
  • the LC parallel resonator split inductor L3 is constituted by a line connecting the via electrode 9d, the inductor electrode 7b, the via electrode 9c, and the lead electrode 8a from the branch point X to one end of the inductor electrode 7c.
  • the extraction electrode 8a is connected to the output terminal 3.
  • the inductor L1 for the LC series resonator includes a via electrode 9p, an inductor electrode 7k, a via electrode 9m, an inductor electrode 7j, a via electrode 9l, an inductor electrode 7h, a via electrode 9j, an inductor electrode 7f, a via electrode 9h, an inductor electrode 7d, and a via electrode. 9f, a relay electrode 6a, and a line connecting the via electrode 9a.
  • the via electrode 9p is connected to the capacitor electrode 5h of the capacitor C1.
  • the via electrode 9a is connected to a capacitor electrode 5b of an LC series resonator capacitor C3 described later.
  • the via electrode 9p passes through the relay electrodes 6n, 6m, 6l, and 6j on the way.
  • the via electrode 9f passes through 6g, 6e, 6c, and 6b in the middle.
  • the LC series resonator capacitor C3 is mainly composed of a capacitor formed between the capacitor electrode 5b and the capacitor electrode 5a.
  • the capacitor electrode 5a also functions as a ground electrode and is connected to the ground terminals 4a and 4b.
  • the LC series resonator inductor L4 is constituted by a line connecting the via electrode 9e, the inductor electrode 7a, and the via electrode 9b from the branch point X to the other end of the inductor electrode 7c.
  • the via electrode 9b is connected to a capacitor electrode 5c of an LC series resonator capacitor C5 described later.
  • the via electrode 9e passes through the relay electrodes 6f and 6d on the way.
  • the LC series resonator capacitor C5 is mainly composed of a capacitor formed between the capacitor electrode 5c and the capacitor electrode 5b.
  • the capacitor electrode 5b is also an electrode of the LC series resonator capacitor C3.
  • the multilayer LC filter 100 according to the first embodiment having the above equivalent circuit and structure has the following characteristics.
  • the multilayer LC filter 100 includes a connection point between two LC parallel resonator split inductors L2 and L3, which is located substantially at the center of a signal line, and a ground (more precisely, an LC series resonator inductor L1 and an LC series resonator use). Since the LC series resonator LC3 is connected between the capacitor C3 and the capacitor C3), the symmetry between the input and output is excellent, and impedance matching between the input and output is easy to achieve.
  • the multilayer LC filter 100 includes an LC parallel resonator split inductor L3 and an LC series resonator inductor L4 that are branched at a branch point X of the inductor electrode 7c.
  • the inductor electrode 7c via electrode 9d, inductor electrode 7b, and via of the LC parallel resonator split inductor L3
  • the winding axis of the LC series resonator inductor L4 is arranged inside the spiral pattern constituted by the electrode 9c and the extraction electrode 8a.
  • the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 are magnetically coupled, and the inductance value of the LC series resonator inductor L4 is strengthened.
  • the multilayer LC filter 100 includes the LC parallel resonator split inductor L3 wound inside the spiral pattern formed by the inductor electrode 7c, via electrode 9e, inductor electrode 7a, and via electrode 9b of the LC series resonator inductor L4.
  • the rotation axis is arranged.
  • the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 have stronger magnetic coupling.
  • the multilayer LC filter 100 includes a winding direction of a spiral pattern constituted by the inductor electrode 7c, the via electrode 9d, the inductor electrode 7b, the via electrode 9c, and the extraction electrode 8a of the split inductor L3 for the LC parallel resonator, and an LC series.
  • the winding direction of the spiral pattern constituted by the inductor electrode 7c, the via electrode 9e, the inductor electrode 7a, and the via electrode 9b of the resonator inductor L4 is opposite to the winding direction.
  • the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 have stronger magnetic coupling.
  • the inductor L4 for LC series resonators can obtain a sufficiently large inductance value without increasing the inductor electrodes 7c and 7a (without increasing the spiral pattern).
  • the multilayer LC filter 100 is magnetically coupled so that the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 are strengthened. Therefore, the inductor L4 for LC series resonator can obtain a sufficiently large inductance value without increasing the inductor electrodes 7c and 7a (without increasing the spiral pattern). As a result, the multilayer LC filter 100 has a large attenuation amount in the vicinity of the passband formed by the LC series resonator LC3 without increasing the size.
  • FIG. 7 shows the frequency characteristics of the multilayer LC filter 100 according to the first embodiment.
  • the multilayer LC filter 100 has an attenuation pole having a predetermined attenuation near the passband, and impedance matching between the input and output.
  • a multilayer LC filter in which an attenuation pole having a desired attenuation amount is formed in the vicinity of the passband and impedance matching between input and output is taken without increasing the size. Can be provided.
  • FIG. 8 shows a multilayer LC filter 200 according to the second embodiment. However, FIG. 8 is an exploded perspective view of the multilayer LC filter 200.
  • the multilayer LC filter 200 is modified in the shape and connection method of the electrodes in the multilayer body 1 of the multilayer LC filter 100 according to the first embodiment.
  • the basic equivalent circuit of the multilayer LC filter 200 is the same as that of the multilayer LC filter 100.
  • multilayer LC filter 200 and the multilayer LC filter 100 have different electrode shapes and connection methods in the multilayer body 1 as described above. The same code numbers are used.
  • winding of a spiral pattern of a split inductor L3 for an LC parallel resonator composed of an inductor electrode 7c, a via electrode 9d, an inductor electrode 7b, a via electrode 9c, and an extraction electrode 8a is performed.
  • the direction and the winding direction of the spiral pattern of the inductor L4 for an LC series resonator constituted by the inductor electrode 7c, the via electrode 9e, the inductor electrode 7a, and the via electrode 9b were reversed.
  • the spiral of the split inductor L3 for LC parallel resonators constituted by the inductor electrode 7c, the via electrode 9d, the inductor electrode 7b, the via electrode 9c, and the extraction electrode 8a.
  • the winding direction of the pattern and the winding direction of the spiral pattern of the inductor L4 for LC series resonator constituted by the inductor electrode 7c, the via electrode 9e, the inductor electrode 7a, and the via electrode 9b were set to be the same direction.
  • the magnetic coupling between the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 is weaker than in the multilayer LC filter 100.
  • FIG. 9 shows the frequency characteristics of the multilayer LC filter 200 according to the second embodiment.
  • the laminated LC filter 200 has an attenuation pole having a predetermined attenuation near the pass band, and impedance matching between the input and output.
  • the winding direction of the spiral pattern of the LC parallel resonator split inductor L3 and the winding direction of the spiral pattern of the LC series resonator inductor L4 are reversed according to the desired frequency characteristics.
  • the strength of magnetic coupling between the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 can be adjusted, and the frequency characteristics and the impedance between the input and output can be adjusted. it can.
  • FIG. 10 shows a multilayer LC filter 300 according to the third embodiment.
  • FIG. 10 is an equivalent circuit diagram of the multilayer LC filter 300.
  • the multilayer LC filter 300 is a modification of the circuit configuration of the multilayer LC filter 100 according to the first embodiment.
  • a capacitor C1 is connected between the input terminal 2 and the LC series resonator LC2.
  • an LC parallel resonator LC11 in which a capacitor C11 and an inductor L11 are connected in parallel is connected.
  • the multilayer LC filter 300 is easier to adjust the impedance between the input and output than the multilayer LC filter 100.
  • the multilayer LC filters 100 to 300 according to the first to third embodiments have been described above.
  • the present invention is not limited to the contents described above, and various modifications can be made in accordance with the spirit of the invention.
  • the type of the LC filter is arbitrary, and various LC filters such as a band-pass filter, a high-pass filter, and a low-pass filter can be configured.
  • the circuit configuration is arbitrary except for the specified part, and various circuit configurations can be adopted.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Filters And Equalizers (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

L'invention concerne un filtre LC stratifié dans lequel un pôle d'atténuation est formé près d'une bande passante et dans lequel l'adaptation d'impédance entre l'entrée et la sortie est exécutée. Dans le filtre LC stratifié, un résonateur LC parallèle (LC1) possède une bobine d'induction de résonateur LC parallèle et un condensateur de résonateur LC parallèle (C4) connectés en parallèle. La bobine d'induction de résonateur LC parallèle est divisée en une pluralité de bobines d'induction de résonateur LC parallèle (L2, L3). Un résonateur LC série (LC3) est connecté entre la masse et un point auquel les bobines d'induction de résonateur LC parallèle divisées (L2, L3) sont connectées entre elles. Le résonateur LC série (LC3) possède une bobine d'induction de résonateur LC série (L4) et un condensateur de résonateur LC série (C5) connectés en série. La bobine d'induction de résonateur LC parallèle divisée (L3) se ramifie à partir de la bobine d'induction de résonateur LC série (L4), en un point situé entre des couches d'un corps stratifié (1). Lors de la visualisation des bobines d'induction de résonateur LC parallèle divisée (L3) et de résonateur LC série (L4), un arbre d'enroulement d'une bobine desdites bobines d'induction est disposé dans un motif en spirale formé d'une électrode de bobine d'induction de l'autre bobine d'induction.
PCT/JP2017/017130 2016-05-17 2017-05-01 Filtre lc stratifié Ceased WO2017199749A1 (fr)

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WO2022070888A1 (fr) * 2020-10-01 2022-04-07 株式会社村田製作所 Composant bobine, circuit filtre le contenant, et dispositif électronique
JPWO2022113674A1 (fr) * 2020-11-25 2022-06-02
CN114584156A (zh) * 2020-12-02 2022-06-03 杭州海康威视数字技术股份有限公司 监控设备及其通信控制方法
CN114826186A (zh) * 2021-01-29 2022-07-29 Tdk株式会社 层叠型电子部件

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WO2022070888A1 (fr) * 2020-10-01 2022-04-07 株式会社村田製作所 Composant bobine, circuit filtre le contenant, et dispositif électronique
JP7107463B1 (ja) * 2020-10-01 2022-07-27 株式会社村田製作所 電子機器
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JP7530581B2 (ja) 2020-11-25 2024-08-08 株式会社村田製作所 ローパスフィルタ、積層型ローパスフィルタおよびフィルタ特性調整方法
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CN114584156A (zh) * 2020-12-02 2022-06-03 杭州海康威视数字技术股份有限公司 监控设备及其通信控制方法
CN114584156B (zh) * 2020-12-02 2024-05-10 杭州海康威视数字技术股份有限公司 监控设备及其通信控制方法
CN114826186A (zh) * 2021-01-29 2022-07-29 Tdk株式会社 层叠型电子部件

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