WO2017199749A1 - Laminated lc filter - Google Patents

Laminated lc filter Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
inductor
electrode
resonator
filter
parallel resonator
Prior art date
Application number
PCT/JP2017/017130
Other languages
French (fr)
Japanese (ja)
Inventor
登 塩川
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2017199749A1 publication Critical patent/WO2017199749A1/en

Links

Images

Classifications

    • 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.

Landscapes

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

Abstract

Provided is a laminated LC filter in which an attenuation pole is formed near a pass band and in which impedance matching between input and output is performed. In the laminated LC filter, an LC parallel resonator LC1 has an LC parallel resonator inductor and an LC parallel resonator capacitor C4 connected in parallel. The LC parallel resonator inductor is divided into divided LC parallel resonator inductors L2, L3. An LC series resonator LC3 is connected between the ground and a point at which the divided LC parallel resonator inductors L2, L3 are connected to each other. The LC series resonator LC3 has an LC series resonator inductor L4 and an LC series resonator capacitor C5 connected in series. At one point between layers of a laminated body 1, the divided LC parallel resonator inductor L3 branches from the LC series resonator inductor L4. When the divided LC parallel resonator inductor L3 and the LC series resonator inductor L4 are viewed, a winding shaft of one of the inductors is disposed inside a spiral pattern formed of an inductor electrode of the other inductor.

Description

積層型ＬＣフィルタMultilayer LC filter
　本発明は、積層型ＬＣフィルタに関し、さらに詳しくは、通過帯域の近傍に十分な減衰量を有する減衰極が形成され、かつ、入出力間のインピーダンスの整合が取られた、小型の積層型ＬＣフィルタに関する。 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.
　入力端子と出力端子とを繋ぐ信号ラインに、インダクタ、キャパシタによって回路網を構成し、所望の周波数の信号のみを通過させるＬＣフィルタが、電子回路に広く使用されている。 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.
　特許文献１（特表２００８-５２９３６０号公報）に、そのようなＬＣフィルタが開示
されている。 Patent Document 1 (Japanese Patent Publication No. 2008-529360) discloses such an LC filter.
　図１１、図１２に、特許文献１に開示されたＬＣフィルタ１０００を示す。ただし、図１１は、ＬＣフィルタ１０００の等価回路図である。図１２は、ＬＣフィルタ１０００の平面図である。 11 and 12 show the LC filter 1000 disclosed in Patent Document 1. FIG. However, FIG. 11 is an equivalent circuit diagram of the LC filter 1000. FIG. 12 is a plan view of the LC filter 1000.
　ＬＣフィルタ１０００は、入力端子（入力ノード）１０１と出力端子（出力ノード）１０２とを備える。 The LC filter 1000 includes an input terminal (input node) 101 and an output terminal (output node) 102.
　ＬＣフィルタ１０００は、入力端子１０１と出力端子１０２との間に、インダクタＬ０１とキャパシタＣ０１とが並列に接続されたＬＣ並列共振器１０３と、インダクタＬ０３と、インダクタＬ０５と、インダクタＬ０６とが、順に直列に接続されている。また、直列に接続されたＬＣ並列共振器１０３、インダクタＬ０３、インダクタＬ０５と並列に、キャパシタＣ０３が接続されている。 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.
　また、ＬＣフィルタ１０００は、入力端子１０１と、ＬＣ並列共振器１０３、キャパシタＣ０３との接続点と、グランドとの間に、キャパシタＣ０２とインダクタＬ０２とが直列に接続されたＬＣ直列共振器１０４が接続されている。さらに、インダクタＬ０３とインダクタＬ０５との接続点と、グランドとの間に、インダクタＬ０４とキャパシタＣ０４とが直列に接続されたＬＣ直列共振器１０５が接続されている。ＬＣ直列共振器１０４、１０５は、それぞれ、ＬＣフィルタ１０００の通過帯域の近傍に、減衰極を形成する役割を果たしている。 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.
　なお、ＬＣフィルタ１０００は、信号ラインのほぼ中央に位置するインダクタＬ０３とインダクタＬ０５との接続点と、グランドとの間に、ＬＣ直列共振器１０５が接続されているため、入出力間の対称性に優れており、比較的入出力間のインピーダンスの整合を取りやすいという利点を備えている。 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.
特表２００８-５２９３６０号公報Special table 2008-529360 gazette
　ＬＣフィルタ１０００は、上述したように、比較的入出力間のインピーダンスの整合を取りやすいものではあるが、さらに高い精度でインピーダンスを調整しなければならない場合には、整合用のキャパシタやインダクタを新たに追加しなければならない場合があった。この場合には、ＬＣフィルタ１０００は、大きさが大きくなってしまうという問題があった。 As described above, 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.
　また、ＬＣフィルタにおいて、特にそうした調整の一環で、特定のインダクタのインダクタンス値を大きくしたい場合、整合用のインダクタを新たに追加する方法に代えて、そのインダクタを構成するインダクタ電極のサイズを大きくする方法もある。しかしながら、たとえば、ＬＣフィルタ１０００において、インダクタＬ０４を構成するインダクタ電極のサイズを大きくしようとした場合、図１２に示すように、インダクタＬ０４のインダクタ電極は平面方向にのみ広がるように構成されているため、サイズを大きくするにはインダクタＬ０４のインダクタ電極を平面方向に大きくしなければならず、ＬＣフィルタ１０００の平面方向の大きさが大きくなってしまうという問題があった。 In addition, in the LC filter, in particular, as part of such adjustment, when it is desired to increase the inductance value of a specific inductor, the size of the inductor electrode constituting the inductor is increased instead of a method of newly adding a matching inductor. There is also a method. However, for example, in the LC filter 1000, when the size of the inductor electrode constituting the inductor L04 is to be increased, as shown in FIG. 12, the inductor electrode of the inductor L04 is configured to expand only in the plane direction. In order to increase the size, 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.
　本発明は、上述し他従の問題を解決するためになされたものであり、その手段として本発明の積層型ＬＣフィルタは、複数の誘電体層が積層された積層体と、積層体の層間に形成された複数のインダクタ電極と、積層体の層間に形成された複数のキャパシタ電極と、誘電体層を貫通して形成された複数のビア電極と、積層体の表面に形成された入力端子と、積層体の表面に形成された出力端子と、を備え、複数のインダクタ電極によってインダクタが構成され、複数のキャパシタ電極によってキャパシタが構成され、入力端子と出力端子とを繋ぐ信号ラインに、ＬＣ並列共振器が接続され、そのＬＣ並列共振器は、ＬＣ並列共振器用インダクタとＬＣ並列共振器用キャパシタとが並列に接続されて構成され、ＬＣ並列共振器用インダクタは、少なくとも２つのＬＣ並列共振器用分割インダクタに分割されて構成され、２つのＬＣ並列共振器用分割インダクタの接続点とグランドとの間に、ＬＣ直列共振器が接続され、そのＬＣ直列共振器は、ＬＣ直列共振器用インダクタとＬＣ直列共振器用キャパシタとが直列に接続されて構成され、２つのＬＣ並列共振器用分割インダクタのうちの一方と、ＬＣ直列共振器用インダクタとが、積層体の１つの層間において分岐され、かつ、積層体を積層方向に透視して、一方のＬＣ並列共振器用分割インダクタとＬＣ直列共振器用インダクタとを見た場合に、一方のインダクタのインダクタ電極によって構成される螺旋パターンの内側に、他方のインダクタの巻回軸が配置されているようにした。 The present invention has been made in order to solve the above-mentioned problems, and as a means therefor, 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. A plurality of inductor electrodes formed on the substrate, a plurality of capacitor electrodes formed between the layers of the multilayer body, a plurality of via electrodes formed through the dielectric layer, and an input terminal formed on the surface of the multilayer body And an output terminal formed on the surface of the multilayer body, an inductor is constituted by a plurality of inductor electrodes, a capacitor is constituted by a plurality of capacitor electrodes, and a signal line connecting the input terminal and the output terminal is provided with an LC A parallel resonator is connected, and the LC parallel resonator is configured by connecting an inductor for LC parallel resonator and a capacitor for LC parallel resonator in parallel, and the inductor for LC parallel resonator is The LC series resonator is divided into at least two LC parallel resonator split inductors, and an LC series resonator is connected between a connection point of the two LC parallel resonator split inductors and the ground. 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.
　なお、上記において、ＬＣ直列共振器は、他の素子や回路を介したうえでグランドに接続されても良い。 In the above, the LC series resonator may be connected to the ground via another element or circuit.
　さらに、他方のインダクタのインダクタ電極によって構成される螺旋パターンの内側に、一方のインダクタの巻回軸が配置されているようにしても良い。この場合には、一方のインダクタと他方のインダクタとの磁気結合をより強くすることができる。 Furthermore, 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.
　一方のインダクタのインダクタ電極によって構成される螺旋パターンの巻回方向と、他方のインダクタのインダクタ電極によって構成される螺旋パターンの巻回方向とを逆方向にすることができる。この場合は、一方のインダクタと他方のインダクタとの磁気結合が強くなるように調整することができる。 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.
　あるいは、一方のインダクタのインダクタ電極によって構成される螺旋パターンの巻回方向と、他方のインダクタのインダクタ電極によって構成される螺旋パターンの巻回方向とを同方向にすることができる。この場合は、一方のインダクタと他方のインダクタとの磁気結合が弱くなるように調整することができる。 Alternatively, 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.
　２つのＬＣ共振器用分割インダクタのうち、積層体の１つの層間においてＬＣ直列共振器用インダクタと分岐された一方のＬＣ並列共振器用分割インダクタのインダクタンス値を、他方のＬＣ並列共振器用分割インダクタのインダクタンス値よりも小さいものとすることができる。この場合には、インダクタンス値が小さくても、他方のＬＣ並列共振器用分割インダクタによって、磁気結合されたＬＣ直列共振器用インダクタのインダクタンス値を強めることができる。 Among the two LC resonator split inductors, 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. Can be smaller. In this case, even if the inductance value is small, the inductance value of the magnetically coupled LC series resonator inductor can be increased by the other LC parallel resonator split inductor.
　入力端子とＬＣ並列共振器とを繋ぐ信号ライン、および、ＬＣ並列共振器と出力端子とを繋ぐ信号ラインの少なくとも一方に、さらに、少なくとも１つのキャパシタを接続しても良い。この場合には、当該キャパシタによって入出力間のインピーダンスを調整することができる。 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.
　入力端子とＬＣ並列共振器とを繋ぐ信号ライン、および、ＬＣ並列共振器と出力端子とを繋ぐ信号ラインの少なくとも一方に、さらに、インピーダンス整合用ＬＣ回路を接続しても良い。この場合には、インピーダンス整合用ＬＣ回路により、さらに入出力間のインピーダンスを調整することができる。インピーダンス整合用ＬＣ回路として、たとえばＬＣ並列共振器を接続することができる。 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. In this case, the impedance between the input and output can be further adjusted by the impedance matching LC circuit. As the impedance matching LC circuit, for example, an LC parallel resonator can be connected.
　入力端子とＬＣ並列共振器とを繋ぐ信号ライン、および、ＬＣ並列共振器と出力端子とを繋ぐ信号ラインの少なくとも一方と、グランドとの間に、さらに、別のＬＣ直列共振器を接続しても良い。この場合には、当該ＬＣ直列共振器によって、通過帯域の近傍に減衰極を形成することができる。 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. In this case, an attenuation pole can be formed in the vicinity of the pass band by the LC series resonator.
　本発明の積層型ＬＣフィルタは、信号ラインのほぼ中央に位置する２つのＬＣ並列共振器用分割インダクタの接続点と、グランドとの間に、ＬＣ直列共振器が接続されているため、入出力間の対称性に優れており、さらに、積層体の１つの層間においてＬＣ直列共振器用インダクタと分岐された一方のＬＣ並列共振器用分割インダクタが、ＬＣ直列共振器用インダクタと磁気結合している。そのため、本発明の積層型ＬＣフィルタは、磁気結合を強めたり、逆に弱めたりすることで、インピーダンスの調整が可能となるため、インピーダンス整合をとるのに整合用のインダクタやキャパシタを追加しなくてもよく、もしくは少量の整合用のインダクタやキャパシタを追加するだけでインピーダンス整合を取ることができる。また、インダクタのインダクタンス値を上げたい場合に、インダクタサイズを大きくせずとも、磁気結合を強めることで十分インピーダンス整合をとることができる。以上より、本発明の構成であれば素子形状を大型化せずともよい。 In the multilayer LC filter of the present invention, 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. Further, when it is desired to increase the inductance value of the inductor, sufficient impedance matching can be achieved by increasing the magnetic coupling without increasing the inductor size. From the above, it is not necessary to increase the size of the element as long as it is a configuration of the present invention.
第１実施形態にかかる積層型ＬＣフィルタ１００の斜視図である。1 is a perspective view of a multilayer LC filter 100 according to a first embodiment. 積層型ＬＣフィルタ１００の分解斜視図である。2 is an exploded perspective view of a multilayer LC filter 100. FIG. 積層型ＬＣフィルタ１００の等価回路図である。3 is an equivalent circuit diagram of the multilayer LC filter 100. FIG. 図４（Ａ）は、シミュレーション実験に使った好ましいＬＣフィルタＸを示す等価回路図である。図４（Ｂ）は、ＬＣフィルタＸの特性図である。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. 図５（Ａ）は、シミュレーション実験に使った比較のためのＬＣフィルタＹを示す等価回路図である。図５（Ｂ）は、ＬＣフィルタＹの特性図である。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. 積層型ＬＣフィルタ１００の要部分解斜視図である。3 is an exploded perspective view of a main part of the multilayer LC filter 100. FIG. 積層型ＬＣフィルタ１１００の周波数特性を示すグラフである。5 is a graph showing frequency characteristics of the multilayer LC filter 1100. 第２実施形態にかかる積層型ＬＣフィルタ２００の斜視図である。It is a perspective view of the multilayer LC filter 200 concerning 2nd Embodiment. 積層型ＬＣフィルタ２００の周波数特性を示すグラフである。5 is a graph showing frequency characteristics of the multilayer LC filter 200. 第３実施形態にかかる積層型ＬＣフィルタ３００の等価回路図である。It is an equivalent circuit diagram of the multilayer LC filter 300 according to the third embodiment. 特許文献１に開示されたＬＣフィルタ１０００の等価回路図である。6 is an equivalent circuit diagram of an LC filter 1000 disclosed in Patent Document 1. FIG. ＬＣフィルタ１０００の平面図である。2 is a plan view of an LC filter 1000. FIG.
　以下、図面とともに、本発明を実施するための形態について説明する。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
　なお、各実施形態は、本発明の実施の形態を例示的に示したものであり、本発明が実施形態の内容に限定されることはない。また、異なる実施形態に記載された内容を組合せて実施することも可能であり、その場合の実施内容も本発明に含まれる。また、図面は、実施形態の理解を助けるためのものであり、必ずしも厳密に描画されていない場合がある。たとえば、描画された構成要素ないし構成要素間の寸法の比率が、明細書に記載されたそれらの寸法の比率と一致していない場合がある。また、明細書に記載されている構成要素が、図面において省略されている場合や、個数を省略して描画されている場合などがある。 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.
　［第１実施形態］
　図１、図２、図３に、第１実施形態にかかる積層型ＬＣフィルタ１００を示す。ただし、図１は斜視図、図２は分解斜視図、図３は等価回路図である。 [First Embodiment]
1, 2, and 3 show a multilayer LC filter 100 according to the first embodiment. 1 is a perspective view, FIG. 2 is an exploded perspective view, and FIG. 3 is an equivalent circuit diagram.
　積層型ＬＣフィルタ１００は、図１に示すように、たとえばセラミックからなる直方体の積層体１を備える。すなわち、積層体１は、上側主面と、下側主面と、こられの両主面を繋ぐ１対の端面と１対の側面とを備える。なお、端面とは、平面方向に見た場合に短辺側に位置する面である。また、側面とは、平面方向に見た場合に長辺側に位置する面である。 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.
　積層体１の一方の端面には入力端子２が形成され、他方の端面には出力端子３が形成されている。また、積層体１の両側面には、１対のグランド端子４ａ、４ｂが形成されている。入力端子２、出力端子３、グランド端子４ａ、４ｂは、それぞれ、積層体１の下側主面および上側主面に延出して形成されている。 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.
　入力端子２、出力端子３、グランド端子４ａ、４ｂは、それぞれ、たとえば、Ａｇ、Ｃｕや、これらの合金などを主成分とする金属により形成することができる。これらの端子の表面には、必要に応じて、Ｎｉ、Ｓｎ、Ａｕなどを主成分にするめっき層が、１層または複数層にわたって形成されていても良い。 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. On the surface of these terminals, 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.
　積層体１は、図２に示すように、誘電体層１ａ～１ｒが下から順に積層された構造からなる。 As shown in FIG. 2, the multilayer body 1 has a structure in which dielectric layers 1a to 1r are sequentially laminated from the bottom.
　誘電体層１ａ～１ｒの層間には、キャパシタ電極５ａ～５ｈ、中継電極６ａ～６ｎ、インダクタ電極７ａ～７ｋ、引出電極８ａが形成されている。また、誘電体層１ｂ～１ｑを貫通して、ビア電極９ａ～９ｐが形成されている。なお、中継電極６ａ～６ｎとは、上側の誘電体層に設けられたビア導体と、下側の誘電体層に設けられたビア電極との接続を確実にするための電極である。また、引出電極８ａとは、端子と接続するための電極である。 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.
　以下に、誘電体層１ａ～１ｒごとに、その誘電体層に形成されたキャパシタ電極５ａ～５ｈ、中継電極６ａ～６ｎ、インダクタ電極７ａ～７ｋ、引出電極８ａについて説明する。また、特に必要がある場合には、その誘電体層に形成された入力端子２、出力端子３、グランド端子４ａ、４ｂについて説明する。 Hereinafter, 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. In addition, when particularly necessary, the input terminal 2, the output terminal 3, and the ground terminals 4a and 4b formed in the dielectric layer will be described.
　誘電体層１ａの一方の端面には入力端子２が形成され、他方の端面には出力端子３が形成されている。また、誘電体層１ａの両側面には、１対のグランド端子４ａ、４ｂが形成されている。入力端子２、出力端子３、グランド端子４ａ、４ｂは、それぞれ、誘電体層１ａの下側主面に延出して形成されている。 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.
　誘電体層１ａの上側主面には、キャパシタ電極５ａが形成されている。キャパシタ電極５ａは、グランド電極としての機能も有している。キャパシタ電極５ａは、グランド端子４ａ、４ｂに接続されている。 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.
　誘電体層１ｂの上側主面には、キャパシタ電極５ｂが形成されている。 A capacitor electrode 5b is formed on the upper main surface of the dielectric layer 1b.
　誘電体層１ｃの上側主面には、キャパシタ電極５ｃ、中継電極６ａが形成されている。 A capacitor electrode 5c and a relay electrode 6a are formed on the upper main surface of the dielectric layer 1c.
　誘電体層１ｄの上側主面には、中継電極６ｂ、インダクタ電極７ａが形成されている。 A relay electrode 6b and an inductor electrode 7a are formed on the upper main surface of the dielectric layer 1d.
　誘電体層１ｅの上側主面には、中継電極６ｃ、６ｄ、引出電極８ａが形成されている。引出電極８ａは、出力端子３に接続されている。 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.
　誘電体層１ｆの上側主面には、中継電極６ｅ、６ｆ、インダクタ電極７ｂが形成されている。 Relay electrodes 6e and 6f and an inductor electrode 7b are formed on the upper main surface of the dielectric layer 1f.
　誘電体層１ｇの上側主面には、中継電極６ｇ、インダクタ電極７ｃが形成されている。 A relay electrode 6g and an inductor electrode 7c are formed on the upper main surface of the dielectric layer 1g.
　誘電体層１ｈの上側主面には、インダクタ電極７ｄ、７ｅが形成されている。 Inductor electrodes 7d and 7e are formed on the upper main surface of the dielectric layer 1h.
　誘電体層１ｉの上側主面には、インダクタ電極７ｆ、７ｇが形成されている。 Inductor electrodes 7f and 7g are formed on the upper main surface of the dielectric layer 1i.
　誘電体層１ｊの上側主面には、インダクタ電極７ｈ、７ｉ形成されている。 Inductor electrodes 7h and 7i are formed on the upper main surface of the dielectric layer 1j.
　誘電体層１ｋの上側主面には、インダクタ電極７ｊ、中継電極６ｈが形成されている。 An inductor electrode 7j and a relay electrode 6h are formed on the upper main surface of the dielectric layer 1k.
　誘電体層１ｌの上側主面には、インダクタ電極７ｋ、中継電極６ｉが形成されている。 An inductor electrode 7k and a relay electrode 6i are formed on the upper main surface of the dielectric layer 1l.
　誘電体層１ｍの上側主面には、中継電極６ｊ、６ｋ、キャパシタ電極５ｄが形成されている。キャパシタ電極５ｄは、出力端子３に接続されている。 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.
　誘電体層１ｎの上側主面には、中継電極６ｌ、キャパシタ電極５ｅが形成されている。 A relay electrode 61 and a capacitor electrode 5e are formed on the upper main surface of the dielectric layer 1n.
　誘電体層１ｏの上側主面には、中継電極６ｍ、キャパシタ電極５ｆが形成されている。 A relay electrode 6m and a capacitor electrode 5f are formed on the upper main surface of the dielectric layer 1o.
　誘電体層１ｐの上側主面には、中継電極６ｎ、キャパシタ電極５ｇが形成されている。キャパシタ電極５ｇは、入力端子２に接続されている。 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.
　誘電体層１ｑの上側主面には、キャパシタ電極５ｈが形成されている。 A capacitor electrode 5h is formed on the upper main surface of the dielectric layer 1q.
　誘電体層１ｒの一方の端面には入力端子２が形成され、他方の端面には出力端子３が形成されている。また、誘電体層１ａの両側面には、１対のグランド端子４ａ、４ｂが形成されている。入力端子２、出力端子３、グランド端子４ａ、４ｂは、それぞれ、誘電体層１ａの上側主面に延出して形成されている。 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.
　次に、誘電体層１ｂ～１ｑを貫通して形成されたビア電極９ａ～９ｐについて説明する。 Next, the via electrodes 9a to 9p formed through the dielectric layers 1b to 1q will be described.
　ビア電極９ａは、キャパシタ電極５ｂと中継電極６ａとを接続している。 The via electrode 9a connects the capacitor electrode 5b and the relay electrode 6a.
　ビア電極９ｂは、キャパシタ電極５ｃとインダクタ電極７ａの一端とを接続している。 The via electrode 9b connects the capacitor electrode 5c and one end of the inductor electrode 7a.
　ビア電極９ｃは、引出電極８ａとインダクタ電極７ｂの一端とを接続している。 The via electrode 9c connects the extraction electrode 8a and one end of the inductor electrode 7b.
　ビア電極９ｄは、インダクタ電極７ｂの他端とインダクタ電極７ｃの一端とを接続している。 The via electrode 9d connects the other end of the inductor electrode 7b and one end of the inductor electrode 7c.
　ビア電極９ｅは、中継電極６ｄ、６ｆを経由して、インダクタ電極７ａの他端とインダクタ電極７ｃの他端とを接続している。 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.
　ビア電極９ｆは、中継電極６ｂ、６ｃ、６ｅ、６ｇを経由して、中継電極６ａとインダクタ電極７ｄの一端とを接続している。 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.
　ビア電極９ｇは、インダクタ電極７ｃの途中に設けられた分岐点Ｘとインダクタ電極７ｅの一端とを接続している。 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.
　ビア電極９ｈは、インダクタ電極７ｄの他端とインダクタ電極７ｆの一端とを接続している。 The via electrode 9h connects the other end of the inductor electrode 7d and one end of the inductor electrode 7f.
　ビア電極９ｉは、インダクタ電極７ｅの他端とインダクタ電極７ｇの一端とを接続している。 The via electrode 9i connects the other end of the inductor electrode 7e and one end of the inductor electrode 7g.
　ビア電極９ｊは、インダクタ電極７ｆの他端とインダクタ電極７ｈの一端とを接続している。 The via electrode 9j connects the other end of the inductor electrode 7f and one end of the inductor electrode 7h.
　ビア電極９ｋは、インダクタ電極７ｇの他端とインダクタ電極７ｉの一端とを接続している。 The via electrode 9k connects the other end of the inductor electrode 7g and one end of the inductor electrode 7i.
　ビア電極９ｌは、インダクタ電極７ｈの他端とインダクタ電極７ｊの一端とを接続している。 The via electrode 9l connects the other end of the inductor electrode 7h and one end of the inductor electrode 7j.
　ビア電極９ｍは、インダクタ電極７ｊの他端とインダクタ電極７ｋの一端とを接続している。 The via electrode 9m connects the other end of the inductor electrode 7j and one end of the inductor electrode 7k.
　ビア電極９ｎは、中継電極６ｈ、６ｉ、６ｋを経由して、インダクタ電極７ｉの他端とキャパシタ電極５ｅとを接続している。 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.
　ビア電極９ｏは、キャパシタ電極５ｅとキャパシタ電極５ｆとを接続している。 The via electrode 9o connects the capacitor electrode 5e and the capacitor electrode 5f.
　ビア電極９ｐは、中継電極６ｊ、６ｌ、６ｍ、６ｎを経由して、インダクタ電極７ｋの他端とキャパシタ電極５ｈとを接続している。 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.
　キャパシタ電極５ａ～５ｈ、中継電極６ａ～６ｎ、インダクタ電極７ａ～７ｋ、引出電極８ａは、たとえば、Ａｇ、Ｃｕや、これらの合金を主成分とする金属により形成することができる。 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.
　以上の構造からなる第１実施形態にかかる積層型ＬＣフィルタ１００は、従来から、積層型ＬＣフィルタを製造するのに使用されている一般的な製造方法によって製造することができる。 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.
　以上の構造からなる第１実施形態にかかる積層型ＬＣフィルタ１００は、図３に示す等価回路を有する。 The multilayer LC filter 100 according to the first embodiment having the above structure has an equivalent circuit shown in FIG.
　積層型ＬＣフィルタ１００は、入力端子２と出力端子３とを繋ぐ信号ラインに、キャパシタＣ１、キャパシタＣ２、ＬＣ並列共振器ＬＣ１が、順に接続されている。 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.
　ＬＣ並列共振器ＬＣ１は、直列に接続された２つのＬＣ並列共振器用分割インダクタＬ２、Ｌ３と、ＬＣ並列共振器用キャパシタＣ４とが並列に接続されて構成されている。なお、分割インダクタという用語は、本来、１つのインダクタでも機能するが、あえて複数のインダクタ（Ｌ２、Ｌ３）に分けて構成しているので、分割という形容を付したものである。 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).
　ＬＣ並列共振器ＬＣ１は、主に、高域側の減衰極を形成する役割を果たしている。また、キャパシタＣ１、Ｃ２は、それぞれ、主に、積層型ＬＣフィルタ１００の入出力間のインピーダンスの整合を取る役割を果たしている。 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.
　積層型ＬＣフィルタ１００は、キャパシタＣ１とキャパシタＣ２との接続点と、グランドとの間に、ＬＣ直列共振器用インダクタＬ１とＬＣ直列共振器用キャパシタＣ３とが直列に接続されたＬＣ直列共振器ＬＣ２が接続されている。ＬＣ直列共振器ＬＣ２は、ハイパスフィルタとして低域側の減衰極を形成する役割を果たしている。 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.
　また、積層型ＬＣフィルタ１００は、ＬＣ並列共振器用分割インダクタＬ２とＬＣ並列共振器用分割インダクタＬ３の接続点と、ＬＣ直列共振器用インダクタＬ１とＬＣ直列共振器用キャパシタＣ３との接続点との間に、ＬＣ直列共振器用インダクタＬ４とＬＣ直列共振器用キャパシタＣ５とが直列に接続されたＬＣ直列共振器ＬＣ３が接続されている。ＬＣ直列共振器ＬＣ３は、ＬＣ直列共振器用キャパシタＣ３を経由してグランドに接続されているということができる。ＬＣ直列共振器ＬＣ３は、ＬＣ並列共振器ＬＣ１により形成される減衰極よりも高域側に減衰極を形成する役割を果たしている。 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.
　また、積層型ＬＣフィルタ１００は、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４とが磁気結合している。 In the multilayer LC filter 100, the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 are magnetically coupled.
　積層型ＬＣフィルタ１００は、ＬＣ並列共振器用分割インダクタＬ２とＬＣ並列共振器用分割インダクタＬ３の接続点に、ＬＣ直列共振器ＬＣ３（ＬＣ直列共振器用インダクタＬ４、ＬＣ直列共振器用キャパシタＣ５）が接続されているため、入出力間の対称性に優れており、入出力間のインピーダンスの整合を取りやすい。また、積層型ＬＣフィルタ１００は、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４とが磁気結合しており、ＬＣ並列共振器用分割インダクタＬ３がＬＣ直列共振器用インダクタＬ４のインダクタンス値を強めている。そのため、ＬＣ直列共振器用インダクタＬ４のインダクタ電極を大きくしなくても、ＬＣ直列共振器用インダクタＬ４のインダクタンス値を大きくすることができる。 In the multilayer LC filter 100, 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. In the multilayer LC filter 100, 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.
　本件発明者は、第１実施形態にかかる積層型ＬＣフィルタ１００の回路を設計するに先立ち、上述した積層型ＬＣフィルタ１００の効果を確認するために、次のシミュレーション実験をおこなった。実験においては、図４（Ａ）に等価回路を示す好ましいＬＣフィルタＸと、図５（Ａ）に等価回路を示す比較のためのＬＣフィルタＹとを構成した。 Prior to designing the circuit of the multilayer LC filter 100 according to the first embodiment, the present inventor conducted the following simulation experiment in order to confirm the effect of the multilayer LC filter 100 described above. In the experiment, 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.
　好ましいＬＣフィルタＸは、図４（Ａ）に示すように、第１実施形態にかかる積層型ＬＣフィルタ１００に近い等価回路を有している。すなわち、ＬＣフィルタＸは、入力端子２と出力端子３とを繋ぐ信号ラインに、ＬＣ並列共振器ＬＣ１を接続している。そして、ＬＣ並列共振器ＬＣ１のＬＣ並列共振器用分割インダクタＬ２とＬＣ並列共振器用分割インダクタＬ３との接続点と、グランドとの間に、ＬＣ直列共振器用インダクタＬ４、ＬＣ直列共振器用キャパシタＣ５とが直列に接続されたＬＣ直列共振器ＬＣ３を接続している。また、ＬＣフィルタＸは、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４とが、磁気結合している。 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. In the LC filter X, the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 are magnetically coupled.
　これに対し、比較のためのＬＣフィルタＹは、図５（Ａ）に示すように、ＬＣ並列共振器用分割インダクタＬ３と出力端子３との接続点と、グランドとの間に、ＬＣ直列共振器用インダクタＬ１４とＬＣ直列共振器用キャパシタＣ１５とが直列に接続されたＬＣ直列共振器ＬＣ１３を接続している。また、ＬＣフィルタＹは、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ１４とが、磁気結合していない。 On the other hand, as shown in FIG. 5A, 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. In the LC filter Y, the LC parallel resonator split inductor L3 and the LC series resonator inductor L14 are not magnetically coupled.
　ＬＣフィルタＸの主なインダクタのインダクタンス値と、ＬＣフィルタＹの主なインダクタのインダクタンス値とを、表１に比較して示す。
Figure JPOXMLDOC01-appb-T000001
 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.
Figure JPOXMLDOC01-appb-T000001
　ＬＣフィルタＸのＬＣ直列共振器用インダクタＬ４と、ＬＣフィルタＹのＬＣ直列共振器用インダクタＬ１４とは、インダクタンス値が大きく異なっている。具体的には、ＬＣ直列共振器用インダクタＬ４のインダクタンス値が０．４ｎＨであるのに対し、ＬＣ直列共振器用インダクタＬ１４のインダクタンス値は１．０ｎＨである。ＬＣフィルタＹにおいては、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ１４とがほとんど磁気結合していないため、通過帯域の近傍に所望の減衰量を有する減衰極を形成するために、ＬＣ直列共振器用インダクタＬ１４のインダクタンス値を１．０ｎＨと大きくしなければならなかった。これに対し、ＬＣフィルタＸは、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４とが磁気結合しており、ＬＣ並列共振器用分割インダクタＬ３がＬＣ直列共振器用インダクタＬ４のインダクタンス値を強めているため、ＬＣ直列共振器用インダクタＬ４のインダクタンス値を小さくすることができる。 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. Therefore, in order to form an attenuation pole having a desired attenuation in the vicinity of the passband, The inductance value of the series resonator inductor L14 had to be increased to 1.0 nH. On the other hand, in the LC filter X, 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.
　図４（Ｂ）に、ＬＣフィルタＸの周波数特性を示す。また、図５（Ｂ）に、ＬＣフィルタＹの周波数特性を示す。 Fig. 4 (B) shows the frequency characteristics of the LC filter X. FIG. 5B shows frequency characteristics of the LC filter Y.
　好ましいＬＣフィルタＸは、図４（Ｂ）に示すように、通過帯域の近傍に所定の減衰量を有する減衰極が形成され、かつ、入出力間のインピーダンスの整合が取れている。これに対し、比較のためのＬＣフィルタＹは、図５（Ｂ）に示すように、通過帯域の近傍に所定の減衰量を有する減衰極が形成されているが、入出力間のインピーダンスの整合が取れていない。これは、ＬＣ直列共振器ＬＣ１３を、ＬＣ並列共振器用分割インダクタＬ３と出力端子３との接続点と、グランドとの間に接続したためであると考えられる。また、ＬＣフィルタＹは、上述したとおり、ＬＣ直列共振器用インダクタＬ１４のインダクタンス値を大きくしなければならず、たとえば積層型ＬＣフィルタに構成した場合には、形状が大型化してしまうという問題を有している。 As shown in FIG. 4B, 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. On the other hand, as shown in FIG. 5B, 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. In addition, as described above, 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.
　以上のシミュレーション実験の結果に基づき、第１実施形態にかかる積層型ＬＣフィルタ１００の等価回路を図３に示すように設計した。 Based on the results of the above simulation experiment, an equivalent circuit of the multilayer LC filter 100 according to the first embodiment was designed as shown in FIG.
　次に、図３に示した積層型ＬＣフィルタ１００の等価回路と、図２に示した積層型ＬＣフィルタ１００の内部構造との関係について説明する。 Next, the relationship between the equivalent circuit of the multilayer LC filter 100 shown in FIG. 3 and the internal structure of the multilayer LC filter 100 shown in FIG. 2 will be described.
　キャパシタＣ１は、主に、キャパシタ電極５ｇとキャパシタ電極５ｈとの間に形成される容量により構成されている。なお、キャパシタ電極５ｇは入力端子２に接続されている。 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.
　キャパシタＣ２は、主に、キャパシタ電極５ｈとキャパシタ電極５ｆとの間に形成される容量により構成されている。 The capacitor C2 is mainly composed of a capacitance formed between the capacitor electrode 5h and the capacitor electrode 5f.
　ＬＣ並列共振器用キャパシタＣ４は、主に、キャパシタ電極５ｅとキャパシタ電極５ｄとの間に形成される容量により構成されている。なお、キャパシタ電極５ｅは、ビア電極９ｏを経由して、キャパシタＣ２のキャパシタ電極５ｆに接続されている。また、キャパシタ電極５ｄは出力端子３に接続されている。 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.
　ＬＣ並列共振器用分割インダクタＬ２は、ビア電極９ｎ、インダクタ電極７ｉ、ビア電極９ｋ、インダクタ電極７ｇ、ビア電極９ｉ、インダクタ電極７ｅ、ビア電極９ｇを繋ぐ線路によって構成されている。なお、ビア電極９ｎは、ＬＣ並列共振器用キャパシタＣ４のキャパシタ電極５ｅに接続されている。また、ビア電極９ｎは、途中に中継電極６ｋ、６ｉ、６ｈを経由している。また、ビア電極９ｇはインダクタ電極７ｃの分岐点Ｘに接続されている。 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.
　ＬＣ並列共振器用分割インダクタＬ３は、インダクタ電極７ｃの分岐点Ｘから一端までの間、ビア電極９ｄ、インダクタ電極７ｂ、ビア電極９ｃ、引出電極８ａを繋ぐ線路によって構成されている。なお、引出電極８ａは出力端子３に接続されている。 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.
　ＬＣ直列共振器用インダクタＬ１は、ビア電極９ｐ、インダクタ電極７ｋ、ビア電極９ｍ、インダクタ電極７ｊ、ビア電極９ｌ、インダクタ電極７ｈ、ビア電極９ｊ、インダクタ電極７ｆ、ビア電極９ｈ、インダクタ電極７ｄ、ビア電極９ｆ、中継電極６ａ、ビア電極９ａを繋ぐ線路によって構成されている。なお、ビア電極９ｐは、キャパシタＣ１のキャパシタ電極５ｈに接続されている。また、ビア電極９ａは、後述するＬＣ直列共振器用キャパシタＣ３のキャパシタ電極５ｂに接続されている。また、ビア電極９ｐは、途中に中継電極６ｎ、６ｍ、６ｌ、６ｊを経由している。また、ビア電極９ｆは、途中に６ｇ、６ｅ、６ｃ、６ｂを経由している。 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.
　ＬＣ直列共振器用キャパシタＣ３は、主に、キャパシタ電極５ｂとキャパシタ電極５ａとの間に形成される容量により構成されている。なお、キャパシタ電極５ａは、グランド電極の機能も有しており、グランド端子４ａ、４ｂに接続されている。 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.
　ＬＣ直列共振器用インダクタＬ４は、インダクタ電極７ｃの分岐点Ｘから他端までの間、ビア電極９ｅ、インダクタ電極７ａ、ビア電極９ｂを繋ぐ線路によって構成されている。なお、ビア電極９ｂは、後述するＬＣ直列共振器用キャパシタＣ５のキャパシタ電極５ｃに接続されている。また、ビア電極９ｅは、途中に中継電極６ｆ、６ｄを経由している。 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.
　ＬＣ直列共振器用キャパシタＣ５は、主に、キャパシタ電極５ｃとキャパシタ電極５ｂとの間に形成される容量により構成されている。なお、キャパシタ電極５ｂは、ＬＣ直列共振器用キャパシタＣ３の電極でもある。 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.
　以上の等価回路および構造からなる第１実施形態にかかる積層型ＬＣフィルタ１００は、次のような特徴を有する。 The multilayer LC filter 100 according to the first embodiment having the above equivalent circuit and structure has the following characteristics.
　まず、積層型ＬＣフィルタ１００は、信号ラインのほぼ中央に位置する２つのＬＣ並列共振器用分割インダクタＬ２とＬ３の接続点と、グランド（より正確にはＬＣ直列共振器用インダクタＬ１とＬＣ直列共振器用キャパシタＣ３との接続点）との間に、ＬＣ直列共振器ＬＣ３が接続されているため、入出力間の対称性に優れており、入出力間のインピーダンスの整合を取りやすくなっている。 First, 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.
　また、積層型ＬＣフィルタ１００は、図６に示すように、ＬＣ並列共振器用分割インダクタＬ３と、ＬＣ直列共振器用インダクタＬ４とが、インダクタ電極７ｃの分岐点Ｘにおいて分岐され、かつ、積層体１を積層方向に透視して、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４とを見た場合に、ＬＣ並列共振器用分割インダクタＬ３のインダクタ電極７ｃ、ビア電極９ｄ、インダクタ電極７ｂ、ビア電極９ｃ、引出電極８ａによって構成される螺旋パターンの内側に、ＬＣ直列共振器用インダクタＬ４の巻回軸が配置されている。この結果、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４とが磁気結合し、ＬＣ直列共振器用インダクタＬ４のインダクタンス値が強められている。 Further, as shown in FIG. 6, 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. Is seen in the lamination direction, and the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 are viewed, 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. As a result, 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.
　また、積層型ＬＣフィルタ１００は、ＬＣ直列共振器用インダクタＬ４のインダクタ電極７ｃ、ビア電極９ｅ、インダクタ電極７ａ、ビア電極９ｂによって構成される螺旋パターンの内側に、ＬＣ並列共振器用分割インダクタＬ３の巻回軸が配置されている。この結果、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４とは、磁気結合がより強くなっている。 Further, 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. As a result, the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 have stronger magnetic coupling.
　さらに、積層型ＬＣフィルタ１００は、ＬＣ並列共振器用分割インダクタＬ３のインダクタ電極７ｃ、ビア電極９ｄ、インダクタ電極７ｂ、ビア電極９ｃ、引出電極８ａによって構成される螺旋パターンの巻回方向と、ＬＣ直列共振器用インダクタＬ４のインダクタ電極７ｃ、ビア電極９ｅ、インダクタ電極７ａ、ビア電極９ｂによって構成される螺旋パターンの巻回方向とが逆方向になっている。この結果、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４とは、磁気結合がより強くなっている。このため、ＬＣ直列共振器用インダクタＬ４は、インダクタ電極７ｃ、７ａを大きくしなくても（螺旋パターンを大きくしなくても）、十分に大きなインダクタンス値を得ることができる。 Furthermore, 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. As a result, the LC parallel resonator split inductor L3 and the LC series resonator inductor L4 have stronger magnetic coupling. For this reason, 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).
　以上のように、積層型ＬＣフィルタ１００は、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４とが強め合うように磁気結合している。そのため、ＬＣ直列共振器用インダクタＬ４は、インダクタ電極７ｃ、７ａを大きくしなくても（螺旋パターンを大きくしなくても）十分に大きなインダクタンス値を得ることができる。この結果、積層型ＬＣフィルタ１００は、形状を大型化することなく、ＬＣ直列共振器ＬＣ３によって形成される通過帯域の近傍の減衰極の減衰量が大きくされている。 As described above, 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.
　図７に、第１実施形態にかかる積層型ＬＣフィルタ１００の周波数特性を示す。 FIG. 7 shows the frequency characteristics of the multilayer LC filter 100 according to the first embodiment.
　積層型ＬＣフィルタ１００は、図７に示すように、通過帯域の近傍に所定の減衰量を有する減衰極が形成され、かつ、入出力間のインピーダンスの整合が取られている。 As shown in FIG. 7, the multilayer LC filter 100 has an attenuation pole having a predetermined attenuation near the passband, and impedance matching between the input and output.
　以上のように、本発明によれば、形状を大型化させることなく、通過帯域近傍に所望の減衰量の減衰極が形成され、かつ入出力間のインピーダンス整合が取られた積層型ＬＣフィルタを提供することができる。 As described above, according to the present invention, there is provided 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.
　［第２実施形態］
　図８に、第２実施形態にかかる積層型ＬＣフィルタ２００を示す。ただし、図８は、積層型ＬＣフィルタ２００の分解斜視図である。 [Second Embodiment]
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.
　積層型ＬＣフィルタ２００は、第１実施形態にかかる積層型ＬＣフィルタ１００の積層体１内の電極の形状や接続方法に変更を加えた。積層型ＬＣフィルタ２００の基本的な等価回路は、積層型ＬＣフィルタ１００と同じにした。 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.
　なお、積層型ＬＣフィルタ２００と積層型ＬＣフィルタ１００とでは、上述したように、積層体１内の電極の形状や接続方法が異なっているが、比較しやすくするために、各構成要素に付した符号番号は同じにしている。 Note that the 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.
　以下、積層型ＬＣフィルタ２００が積層型ＬＣフィルタ１００と異なっている部分について説明する。 Hereinafter, portions where the multilayer LC filter 200 is different from the multilayer LC filter 100 will be described.
　積層型ＬＣフィルタ１００では、図２に示すように、インダクタ電極７ｃ、ビア電極９ｄ、インダクタ電極７ｂ、ビア電極９ｃ、引出電極８ａによって構成されるＬＣ並列共振器用分割インダクタＬ３の螺旋パターンの巻回方向と、インダクタ電極７ｃ、ビア電極９ｅ、インダクタ電極７ａ、ビア電極９ｂによって構成されるＬＣ直列共振器用インダクタＬ４の螺旋パターンの巻回方向とを逆方向にしていた。 In the multilayer LC filter 100, as shown in FIG. 2, 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.
　これに対し、積層型ＬＣフィルタ２００では、図８に示すように、インダクタ電極７ｃ、ビア電極９ｄ、インダクタ電極７ｂ、ビア電極９ｃ、引出電極８ａによって構成されるＬＣ並列共振器用分割インダクタＬ３の螺旋パターンの巻回方向と、インダクタ電極７ｃ、ビア電極９ｅ、インダクタ電極７ａ、ビア電極９ｂによって構成されるＬＣ直列共振器用インダクタＬ４の螺旋パターンの巻回方向とを同方向にした。 On the other hand, in the multilayer LC filter 200, as shown in FIG. 8, 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.
　この結果、積層型ＬＣフィルタ２００は、積層型ＬＣフィルタ１００よりも、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４との磁気結合が弱くなっている。 As a result, in the multilayer LC filter 200, 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.
　図９に、第２実施形態にかかる積層型ＬＣフィルタ２００の周波数特性を示す。 FIG. 9 shows the frequency characteristics of the multilayer LC filter 200 according to the second embodiment.
　積層型ＬＣフィルタ２００は、図９に示すように、通過帯域の近傍に所定の減衰量を有する減衰極が形成され、かつ、入出力間のインピーダンスの整合が取られている。 As shown in FIG. 9, 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.
　このように、本発明においては、所望する周波数特性に応じて、ＬＣ並列共振器用分割インダクタＬ３の螺旋パターンの巻回方向と、ＬＣ直列共振器用インダクタＬ４の螺旋パターンの巻回方向とを、逆方向にしたり、同方向にしたりすることにより、ＬＣ並列共振器用分割インダクタＬ３とＬＣ直列共振器用インダクタＬ４との磁気結合の強さを調整し、周波数特性や入出力間のインピーダンスを調整することができる。 Thus, in the present invention, 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. By adjusting the direction or the same direction, 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.
　［第３実施形態］
　図１０に、第３実施形態にかかる積層型ＬＣフィルタ３００を示す。ただし、図１０は、積層型ＬＣフィルタ３００の等価回路図である。 [Third Embodiment]
FIG. 10 shows a multilayer LC filter 300 according to the third embodiment. However, FIG. 10 is an equivalent circuit diagram of the multilayer LC filter 300.
　積層型ＬＣフィルタ３００は、第１実施形態にかかる積層型ＬＣフィルタ１００の回路構成に変更を加えた。 The multilayer LC filter 300 is a modification of the circuit configuration of the multilayer LC filter 100 according to the first embodiment.
　積層型ＬＣフィルタ１００では、図３に示すように、入力端子２とＬＣ直列共振器ＬＣ２との間にキャパシタＣ１を接続していた。積層型ＬＣフィルタ３００では、キャパシタＣ１に代えて、図１０に示すように、キャパシタＣ１１とインダクタＬ１１とが並列に接続されたＬＣ並列共振器ＬＣ１１を接続した。 In the multilayer LC filter 100, as shown in FIG. 3, a capacitor C1 is connected between the input terminal 2 and the LC series resonator LC2. In the multilayer LC filter 300, instead of the capacitor C1, as shown in FIG. 10, an LC parallel resonator LC11 in which a capacitor C11 and an inductor L11 are connected in parallel is connected.
　積層型ＬＣフィルタ３００は、積層型ＬＣフィルタ１００よりも、入出力間のインピーダンスの調整がより容易になっている。 The multilayer LC filter 300 is easier to adjust the impedance between the input and output than the multilayer LC filter 100.
　以上、第１実施形態～第３実施形態にかかる積層型ＬＣフィルタ１００～３００について説明した。しかしながら、本発明が上述した内容に限定されることはなく、発明の趣旨に沿って、種々の変更をなすことができる。 The multilayer LC filters 100 to 300 according to the first to third embodiments have been described above. However, 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.
　たとえば、ＬＣフィルタの種類は任意であり、バンドパスフィルタ、ハイパスフィルタ、ローパスフィルタ等、種々のＬＣフィルタを構成することができる。また、回路構成も、特に規定した部分以外は任意であり、種々の回路構成を採用することができる。 For example, 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. Also, the circuit configuration is arbitrary except for the specified part, and various circuit configurations can be adopted.
１・・・積層体
１ａ～１ｒ・・・誘電体層
２・・・入力端子
３・・・出力端子
４ａ、４ｂ・・・グランド端子
５ａ～５ｈ・・・キャパシタ電極
６ａ～６ｎ・・・中継電極
７ａ～７ｋ・・・インダクタ電極
８ａ・・・引出電極
９ａ～９ｐ・・・ビア電極
ＬＣ１・・・ＬＣ並列共振器
Ｌ２、Ｌ３・・・ＬＣ並列共振器用分割インダクタ
Ｃ４・・・ＬＣ並列共振器用キャパシタ
ＬＣ３・・・ＬＣ直列共振器
Ｌ４・・・ＬＣ直列共振器用インダクタ
Ｃ５・・・ＬＣ直列共振器用インダクタ DESCRIPTION OF SYMBOLS 1 ... Laminated body 1a-1r ... Dielectric layer 2 ... Input terminal 3 ... Output terminal 4a, 4b ... Ground terminal 5a-5h ... Capacitor electrode 6a-6n ... Relay Electrodes 7a to 7k ... Inductor electrodes 8a ... Lead electrodes 9a to 9p ... Via electrodes LC1 ... LC parallel resonators L2, L3 ... Split inductor C4 for LC parallel resonators ... LC parallel resonance Capacitor LC3... LC series resonator L4... LC series resonator inductor C5... LC series resonator inductor

Claims (9)

  1. 　複数の誘電体層が積層された積層体と、
    　前記積層体の層間に形成された複数のインダクタ電極と、
    　前記積層体の層間に形成された複数のキャパシタ電極と、
    　前記誘電体層を貫通して形成された複数のビア電極と、
    　前記積層体の表面に形成された入力端子と、
    　前記積層体の表面に形成された出力端子と、を備え、
    　複数の前記インダクタ電極によってインダクタが構成され、
    　複数の前記キャパシタ電極によってキャパシタが構成された積層型ＬＣフィルタであって、
    　前記入力端子と前記出力端子とを繋ぐ信号ラインに、ＬＣ並列共振器が接続され、当該ＬＣ並列共振器は、ＬＣ並列共振器用インダクタとＬＣ並列共振器用キャパシタとが並列に接続されて構成され、
    　前記ＬＣ並列共振器用インダクタは、少なくとも２つのＬＣ並列共振器用分割インダクタに分割されて構成され、
    　２つの前記ＬＣ並列共振器用分割インダクタの接続点とグランドとの間に、ＬＣ直列共振器が接続され、当該ＬＣ直列共振器は、ＬＣ直列共振器用インダクタとＬＣ直列共振器用キャパシタとが直列に接続されて構成され、
    　２つの前記ＬＣ並列共振器用分割インダクタのうちの一方と、前記ＬＣ直列共振器用インダクタとが、前記積層体の１つの前記層間において分岐され、かつ、前記積層体を積層方向に透視して、一方の前記ＬＣ並列共振器用分割インダクタと前記ＬＣ直列共振器用インダクタとを見た場合に、一方のインダクタの前記インダクタ電極によって構成される螺旋パターンの内側に、他方のインダクタの巻回軸が配置されている積層型ＬＣフィルタ。     A laminate in which a plurality of dielectric layers are laminated;
    A plurality of inductor electrodes formed between the layers of the laminate;
    A plurality of capacitor electrodes formed between the layers of the laminate;
    A plurality of via electrodes formed through the dielectric layer;
    An input terminal formed on the surface of the laminate;
    An output terminal formed on the surface of the laminate,
    An inductor is constituted by a plurality of the inductor electrodes,
    A multilayer LC filter in which a capacitor is constituted by a plurality of the capacitor electrodes,
    An LC parallel resonator is connected to a signal line connecting the input terminal and the output terminal, and the LC parallel resonator is configured by connecting an inductor for LC parallel resonator and a capacitor for LC parallel resonator in parallel.
    The LC parallel resonator inductor is divided into at least two LC parallel resonator split inductors,
    An LC series resonator is connected between the connection point of the two split inductors for the LC parallel resonator and the ground, and the LC series resonator is connected in series with the inductor for the LC series resonator and the capacitor for the LC series resonator. Is configured,
    One of the two split inductors for the LC parallel resonator and the inductor for the LC series resonator are branched between one of the layers of the multilayer body, and one side of the multilayer body is seen through in the stacking direction. When the split inductor for the LC parallel resonator and the inductor for the LC series resonator are viewed, the winding axis of the other inductor is disposed inside the spiral pattern constituted by the inductor electrode of the one inductor. Laminated LC filter.
  2. 　さらに、他方の前記インダクタの前記インダクタ電極によって構成される螺旋パターンの内側に、一方の前記インダクタの巻回軸が配置されている、請求項１に記載された積層型ＬＣフィルタ。 Furthermore, the multilayer LC filter according to claim 1, wherein a winding axis of one of the inductors is disposed inside a spiral pattern constituted by the inductor electrode of the other inductor.
  3. 　一方の前記インダクタの前記インダクタ電極によって構成される螺旋パターンの巻回方向と、他方の前記インダクタの前記インダクタ電極によって構成される螺旋パターンの巻回方向とが逆方向である、請求項１または２に記載された積層型ＬＣフィルタ。 The winding direction of the spiral pattern constituted by the inductor electrode of one of the inductors and the winding direction of the spiral pattern constituted by the inductor electrode of the other inductor are opposite directions. The laminated LC filter described in 1.
  4. 　一方の前記インダクタの前記インダクタ電極によって構成される螺旋パターンの巻回方向と、他方の前記インダクタの前記インダクタ電極によって構成される螺旋パターンの巻回方向とが同方向である、請求項１または２に記載された積層型ＬＣフィルタ。 The winding direction of the spiral pattern constituted by the inductor electrode of one of the inductors and the winding direction of the spiral pattern constituted by the inductor electrode of the other inductor are the same direction. The laminated LC filter described in 1.
  5. 　２つの前記ＬＣ並列共振器用分割インダクタのうち、前記積層体の１つの前記層間において前記ＬＣ直列共振器用インダクタと分岐された一方の前記ＬＣ並列共振器用分割インダクタのインダクタンス値が、他方の前記並列共振器用分割インダクタのインダクタンス値よりも小さい、請求項１ないし４のいずれか１項に記載された積層型ＬＣフィルタ。 Of the two split inductors for the LC parallel resonator, the inductance value of one of the split inductors for the LC parallel resonator branched from the LC series resonator inductor between the one layer of the multilayer body is the other of the parallel resonances of the LC parallel resonator The multilayer LC filter according to any one of claims 1 to 4, wherein the multilayer LC filter is smaller than an inductance value of the split inductor for a machine.
  6. 　前記入力端子と前記ＬＣ並列共振器とを繋ぐ前記信号ライン、および、前記ＬＣ並列共振器と前記出力端子とを繋ぐ前記信号ラインの少なくとも一方に、さらに、少なくとも１つのキャパシタが接続された、請求項１ないし５のいずれか１項に記載された積層型ＬＣフィルタ。 At least one capacitor is 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. Item 6. The multilayer LC filter according to any one of Items 1 to 5.
  7. 　前記入力端子と前記ＬＣ並列共振器とを繋ぐ前記信号ライン、および、前記ＬＣ並列共振器と前記出力端子とを繋ぐ前記信号ラインの少なくとも一方に、さらに、インピーダンス整合用ＬＣ回路が接続された、請求項１ないし６のいずれか１項に記載された積層型ＬＣフィルタ。 An impedance matching LC circuit is 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, The multilayer LC filter according to any one of claims 1 to 6.
  8. 　前記インピーダンス整合用ＬＣ回路がＬＣ並列共振器である、請求項７に記載された積層型ＬＣフィルタ。 The multilayer LC filter according to claim 7, wherein the impedance matching LC circuit is an LC parallel resonator.
  9. 　前記入力端子と前記ＬＣ並列共振器とを繋ぐ前記信号ライン、および、前記ＬＣ並列共振器と前記出力端子とを繋ぐ前記信号ラインの少なくとも一方と、前記グランドとの間に、さらに、別のＬＣ直列共振器が接続された、請求項１ないし８のいずれか１項に記載された積層型ＬＣフィルタ。 Between the signal line connecting the input terminal and the LC parallel resonator, at least one of the signal line connecting the LC parallel resonator and the output terminal, and the ground, another LC The multilayer LC filter according to any one of claims 1 to 8, wherein a series resonator is connected.
PCT/JP2017/017130 2016-05-17 2017-05-01 Laminated lc filter WO2017199749A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-099159 2016-05-17
JP2016099159 2016-05-17

Publications (1)

Publication Number Publication Date
WO2017199749A1 true WO2017199749A1 (en) 2017-11-23

Family

ID=60325090

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/017130 WO2017199749A1 (en) 2016-05-17 2017-05-01 Laminated lc filter

Country Status (2)

Country Link
TW (1) TW201807951A (en)
WO (1) WO2017199749A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022070888A1 (en) * 2020-10-01 2022-04-07 株式会社村田製作所 Coil component, filter circuit containing same, and electronic device
WO2022113674A1 (en) * 2020-11-25 2022-06-02 株式会社村田製作所 Low-pass filter, laminated low-pass filter, and filter characteristic adjustment method
CN114584156A (en) * 2020-12-02 2022-06-03 杭州海康威视数字技术股份有限公司 Monitoring device and communication control method thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57202110A (en) * 1981-06-05 1982-12-10 Fujitsu Ltd Bridged t type delay equalizer
JPH10200357A (en) * 1996-12-31 1998-07-31 Taiyo Yuden Co Ltd Laminated lc composite part and method for adjusting characteristic for the same
JP2006203862A (en) * 2004-12-20 2006-08-03 Tdk Corp Noise suppression circuit
JP2008529360A (en) * 2005-01-20 2008-07-31 Ｔｄｋ株式会社 Filter with improved stopband performance
JP2012090171A (en) * 2010-10-21 2012-05-10 Nec Access Technica Ltd Antenna device
WO2012121038A1 (en) * 2011-03-07 2012-09-13 株式会社村田製作所 Filter
JP2013070288A (en) * 2011-09-23 2013-04-18 Murata Mfg Co Ltd Bandpass filter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57202110A (en) * 1981-06-05 1982-12-10 Fujitsu Ltd Bridged t type delay equalizer
JPH10200357A (en) * 1996-12-31 1998-07-31 Taiyo Yuden Co Ltd Laminated lc composite part and method for adjusting characteristic for the same
JP2006203862A (en) * 2004-12-20 2006-08-03 Tdk Corp Noise suppression circuit
JP2008529360A (en) * 2005-01-20 2008-07-31 Ｔｄｋ株式会社 Filter with improved stopband performance
JP2012090171A (en) * 2010-10-21 2012-05-10 Nec Access Technica Ltd Antenna device
WO2012121038A1 (en) * 2011-03-07 2012-09-13 株式会社村田製作所 Filter
JP2013070288A (en) * 2011-09-23 2013-04-18 Murata Mfg Co Ltd Bandpass filter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022070888A1 (en) * 2020-10-01 2022-04-07 株式会社村田製作所 Coil component, filter circuit containing same, and electronic device
JP7107463B1 (en) * 2020-10-01 2022-07-27 株式会社村田製作所 Electronics
JP2022130663A (en) * 2020-10-01 2022-09-06 株式会社村田製作所 Coil component and filter circuit including the same
WO2022113674A1 (en) * 2020-11-25 2022-06-02 株式会社村田製作所 Low-pass filter, laminated low-pass filter, and filter characteristic adjustment method
JP7530581B2 (en) 2020-11-25 2024-08-08 株式会社村田製作所 Low-pass filter, laminated low-pass filter and filter characteristic adjustment method
CN114584156A (en) * 2020-12-02 2022-06-03 杭州海康威视数字技术股份有限公司 Monitoring device and communication control method thereof
CN114584156B (en) * 2020-12-02 2024-05-10 杭州海康威视数字技术股份有限公司 Monitoring device and communication control method thereof

Also Published As

Publication number Publication date
TW201807951A (en) 2018-03-01

Similar Documents

Publication Publication Date Title
JP5787760B2 (en) filter
JP5440813B2 (en) Electronic components
JP5874718B2 (en) Frequency variable resonance circuit and frequency variable filter
JP5382002B2 (en) Electronic component and manufacturing method thereof
US10340873B2 (en) Band pass filter and laminate band pass filter
US10530322B2 (en) Resonant circuit, band elimination filter, and band pass filter
JP5799918B2 (en) filter
JP5516160B2 (en) Filter circuit and electronic component
JPWO2006022098A1 (en) LC composite parts
WO2017199749A1 (en) Laminated lc filter
JP5790789B2 (en) Electronic components
TW201834391A (en) Laminated LC filter
JP2009218756A (en) Laminated type band-pass filter
JP5672266B2 (en) Electronic components
JP6852356B2 (en) Laminated filter
JP5888475B2 (en) Electronic components
TWI577131B (en) Filter
WO2014045648A1 (en) Filter
JP5614495B2 (en) Electronic components
WO2017199745A1 (en) Lc filter
WO2017086195A1 (en) Laminated lc filter
JPWO2012127952A1 (en) Electronic components
JP5285951B2 (en) Bandpass filter and multilayer bandpass filter.
JP4256317B2 (en) Multilayer bandstop filter
WO2019159774A1 (en) Balance filter

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17799179

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 17799179

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP