JP4569571B2 - LC composite parts - Google Patents

Description

  The present invention relates to an LC composite component, and more particularly to an LC composite component including a band pass filter, a low pass filter and / or a high pass filter used in a high frequency band.

  In general, a bandpass filter that passes a signal in a specific frequency band in a high frequency band includes a plurality of LC resonators. As this type of conventional band-pass filter, for example, a multilayer LC band-pass filter disclosed in Patent Document 1 is known. Its specific configuration is shown in FIG. 13 and its equivalent circuit is shown in FIG. This band-pass filter 70 combines a first-stage LC resonator Q11 and a second-stage LC resonator Q12 in a laminate 71 formed by laminating a plurality of ceramic sheets 72 made of a ceramic dielectric material. This is a two-stage LC bandpass filter that is capacitively coupled by a capacitor Cs.

  In the band pass filter 70, the inductor L11 of the first-stage LC resonator Q11 has a double structure composed of inductor patterns 74a and 74b having the same pattern shape laminated via two sheets 72. have. These inductor patterns 74a and 74b are connected to shield terminal electrodes (grounds) 80a and 80b, and input terminals P11 formed on the laminate 71 through lead patterns 84a and 84b drawn from the middle (see FIG. 14). )It is connected to the.

  Similarly, the inductor L12 of the second-stage LC resonator Q12 has a double structure composed of inductor patterns 75a and 75b having the same pattern shape laminated via two sheets 72. These inductor patterns 75a and 75b are also connected to the shield terminal electrodes 80a and 80b, and are connected to the output terminal P12 (see FIG. 14) formed in the multilayer body 71 through the lead patterns 85a and 85b drawn from the middle. It is connected. The inductor patterns 74a and 75a are arranged in parallel with each other on the single sheet 72, and the inductor patterns 74b and 75b are also arranged in parallel with each other on the single sheet 72.

  Capacitor patterns 78a and 78b connected to the shield terminal electrodes 80a and 80b are opposed to the wide portions 76a and 76b of the inductor patterns 74a and 74b, respectively, and the first stage LC resonance is caused by the electrostatic capacitance formed therebetween. The capacitor C11 of the device Q11 is formed. Capacitor patterns 79a and 79b connected to the shield terminal electrodes 80a and 80b are opposed to the wide portions 77a and 77b of the inductor patterns 75a and 75b, respectively, and the second stage is formed by the electrostatic capacitance formed therebetween. A capacitor C12 of the LC resonator Q12 is formed. Further, a coupling capacitor pattern 82 for forming a coupling capacitor Cs is formed between the wide portions 76a and 76b of the inductor patterns 74a and 74b and between the wide portions 77a and 77b of the inductor patterns 75a and 75b.

In the conventional multilayer LC bandpass filter 70 having the above-described configuration, the inductor patterns 74b and 75b are arranged in parallel with each other, and the inductor patterns 74a and 75a are also arranged in parallel with each other. By the way, along with miniaturization of electronic devices, a small LC bandpass filter is also required. In order to obtain a small product in the conventional multilayer LC bandpass filter 70, inductor patterns 74a and 75a are required. Therefore, it is difficult to keep the coupling between the inductors L11 and L12 low. Further, since the coupling between the inductors L11 and L12 is controlled by the interval between the inductor patterns 74a and 75a and the interval between the inductor patterns 74b and 75b, the adjustment range of the coupling between the inductors L11 and L12 becomes narrower as the product becomes smaller. There was a problem of becoming.
JP 2000-323901 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a small LC composite component that can be controlled in a wide range of coupling between inductors of an LC resonator, has a high degree of design freedom, and has a narrow band in a high frequency band.

In order to achieve the above object, a first invention is characterized in that a first LC resonator comprising a first inductor pattern and a first capacitor pattern is formed in a laminated body formed by stacking a plurality of dielectric layers; a first 2LC resonator consisting of the inductor pattern and the second capacitor patterns, the third inductor pattern and the 1LC resonator and the second 2LC resonator is and having connected to ground, said first 2LC resonance and the second 1LC resonator An LC composite component including a plurality of coupling capacitor patterns constituting a coupling capacitor for coupling a capacitor , one ground electrode, and a ground terminal formed on a side surface of the multilayer body , wherein the first and first 2 inductor pattern, together with at least a portion is formed on the same dielectric layer, one end thereof is of the third inductor pattern Is connected to the passage connecting portion and the other end is drawn to the side face of the laminate that faces said first, second, and third inductor pattern are arranged substantially symmetrically with respect to the common connection portion, the coupling The capacitor pattern is formed on a dielectric layer adjacent to the dielectric layer on which the first, second, and third inductor patterns are formed, and only one of the first and second inductor patterns is viewed from the stacking direction. The ground electrode is connected to the ground terminal by a lead pattern having a predetermined inductance, and the lead pattern and the first and second capacitor patterns constitute a series LC resonator, and the first and second capacitors The pattern is formed on a dielectric layer different from the first, second and third inductor patterns, and in order from the top of the multilayer body. Serial first, second and third inductor pattern, the first and second capacitor patterns, said ground electrode is formed, characterized by.

  In the LC composite component according to the first invention, the first inductor pattern and the second inductor pattern are arranged substantially symmetrically with the third inductor pattern interposed therebetween, so that the third inductor pattern is interposed therebetween. In addition, a distance between the first inductor pattern and the second inductor pattern is ensured, and the inductive coupling between the two is suppressed by this distance, and the Q values of the first LC resonator and the second LC resonator can be improved. A narrow band LC filter can be obtained. In addition, since the first inductor pattern of the first LC resonator and the second inductor pattern of the second LC resonator are grounded through the third inductor pattern, the inductive coupling between the first inductor pattern and the second inductor pattern is connected to the third inductor pattern. Control is possible by the size of the inductor of the pattern, and the inductive coupling between the first inductor pattern and the second inductor pattern can be designed to a desired value.

According to a second aspect of the present invention, a first LC resonator including a first inductor pattern and a first capacitor pattern, a second inductor pattern, and a second capacitor pattern are formed in a laminated body formed by stacking a plurality of dielectric layers. a first 2LC resonator consisting of the third inductor pattern and the 1LC resonator and the second 2LC resonator is and having connected to ground, coupling capacitor for coupling the first 2LC resonator and the second 1LC resonator A plurality of coupled capacitor patterns, one ground electrode, and a ground terminal formed on a side surface of the multilayer body , wherein the third inductor pattern is formed on the dielectric layer. When seen through from the stacking direction, the stacked body is provided so as to be divided into two regions, and the first inset is provided in one of the two regions. Kuta pattern, the second inductor pattern are respectively provided on the other regions, the first and second inductor pattern, together with at least a portion is formed on the same dielectric layer, one end thereof is the first The third inductor pattern is connected to a common connection portion, and the other end is drawn out to the side surface of the opposing laminate, and the first, second, and third inductor patterns are arranged substantially symmetrically with respect to the common connection portion. The coupling capacitor pattern is formed on a dielectric layer adjacent to the dielectric layer on which the first, second, and third inductor patterns are formed, and the first and second inductor patterns are viewed from the stacking direction. And the ground electrode is connected to the ground terminal by a lead pattern having a predetermined inductance, and the lead electrode Wherein the pattern first, series LC resonator and the second capacitor pattern is formed, the first and second capacitor patterns are formed on the first, different dielectric layer and the second and third inductor pattern In addition, the first, second and third inductor patterns, the first and second capacitor patterns, and the ground electrode are formed in order from the top of the multilayer body.

  In the LC composite component according to the second invention, the first inductor pattern and the second inductor pattern are connected to the common connection portion of the third inductor pattern provided so as to partition the multilayer body into two regions, and Since the first inductor pattern is provided in this area and the second inductor pattern is provided in the other area, a distance between the first inductor pattern and the second inductor pattern is secured, and this distance causes inductive coupling between the two. As a result, the Q values of the first LC resonator and the second LC resonator can be improved, and a narrow band LC filter can be obtained. In addition, since the first inductor pattern of the first LC resonator and the second inductor pattern of the second LC resonator are grounded through the third inductor pattern, the inductive coupling between the first inductor pattern and the second inductor pattern is connected to the third inductor pattern. Control is possible by the size of the inductor of the pattern, and the inductive coupling between the first inductor pattern and the second inductor pattern can be designed to a desired value.

In the LC composite component according to the second invention, it is preferable that the first inductor pattern and the second inductor pattern extend in a direction away from the common connection portion of the third inductor pattern.

  In the LC composite component according to the first and second inventions, the first inductor pattern and the second inductor pattern may be arranged substantially point-symmetrically with respect to the common connection portion of the third inductor pattern. Since the first inductor pattern and the second inductor pattern are substantially point-symmetric with respect to the common connection portion of the third inductor pattern, the number of curved portions of the first inductor pattern adjacent to the same side of the dielectric layer And the number of curved portions of the second inductor pattern, and the characteristic changes of the first LC resonator and the second LC resonator due to processing variations such as cut deviation and stacking deviation of the dielectric layer are offset, Variations in the overall filter characteristics can be reduced.

  Further, the first inductor pattern and the second inductor pattern may be arranged substantially symmetrically with respect to the common connection portion. Since the third inductor pattern is interposed between the first inductor pattern and the second inductor pattern, a distance between the first inductor pattern and the second inductor pattern can be secured, and the inductive coupling between the two by this distance. The Q values of the first LC resonator and the second LC resonator can be improved and a narrow band LC filter can be obtained.

  The first inductor pattern and the second inductor pattern may have a meander pattern shape. If the first inductor pattern and the second inductor pattern have a meandering pattern shape, the length of the first inductor pattern and the second inductor pattern increases, and the inductance of the first inductor pattern and the second inductor pattern increases. As a result, the size of the dielectric layer can be reduced, and the LC composite component can be reduced in size.

  Further, each of the first inductor pattern and the second inductor pattern may have an even number of curved portions. If each of the first inductor pattern and the second inductor pattern has an even number of curved portions, the number of the curved portions of the first inductor pattern and the number of the curved portions of the first inductor pattern located along the same side of the main surface of the dielectric layer will be described. 2 The number of curved portions of the inductor pattern is the same. As a result, changes in the characteristics of the first LC resonator and the second resonator LC due to variations in processing such as cut displacement and stacking displacement of the dielectric layer are offset, and variations in overall filter characteristics can be reduced.

  Alternatively, the first inductor pattern and the second inductor pattern may be wound patterns. If the first inductor pattern and the second inductor pattern have a winding pattern, the length becomes longer, and the inductance can be increased. Thereby, the size of the dielectric layer can be reduced, and the LC composite component can be miniaturized.

  Furthermore, the first inductor pattern and the second inductor pattern may be formed over a plurality of dielectric layers. With such a configuration, the current density of the current flowing through the first inductor pattern and the second inductor pattern formed in each dielectric layer is reduced, and insertion loss can be reduced.

  The third inductor pattern may be formed on the same dielectric layer as the first inductor pattern and the second inductor pattern. That is, since the third inductor pattern is interposed between the first inductor pattern and the second inductor pattern, the distance between the first inductor pattern and the second inductor pattern is secured, and the inductive coupling between the two is suppressed by this distance. The Q values of the first LC resonator and the second LC resonator can be improved, and a narrow band LC filter can be obtained.

  Further, the third inductor pattern may be formed on a dielectric layer different from the dielectric layer on which the first inductor pattern and the second inductor pattern are formed. Accordingly, the area of the dielectric layer on which the first inductor pattern and the second inductor pattern are formed is widened, and the degree of freedom in pattern design of the first inductor pattern and the second inductor pattern is increased.

  Further, the multilayer body is formed by laminating rectangular dielectric layers, and the third inductor pattern has a straight line portion connecting the center portions of two opposing sides, and is common to almost the center of the straight line portions. It can be set as the structure where the connection part is located. Since the common connection portion is located substantially at the center of the third inductor pattern, the distance between the first inductor pattern and the second inductor pattern can be secured with the common connection portion therebetween, and this distance Inductive coupling can be suppressed to improve the Q values of the first LC resonator and the second LC resonator, and a narrow band LC filter can be obtained.

1 is a perspective view showing an external appearance of an LC composite component that is a first embodiment of the present invention. FIG. It is a disassembled perspective view of LC composite component shown in FIG. FIG. 2 is an equivalent circuit diagram of the LC composite component shown in FIG. 1. FIG. 4 is a plan view of a first inductor pattern, a second inductor pattern, and a third inductor pattern of the LC composite component shown in FIG. 1. FIG. 5 is a plan view showing a modification of the first inductor pattern and the second inductor pattern shown in FIG. 4. It is a graph which shows the filter characteristic of LC composite component shown in FIG. 1, and the conventional band pass filter. It is a disassembled perspective view of LC composite component which is 2nd Example of this invention. FIG. 8 is a perspective view showing a modification of the first inductor pattern and the second inductor pattern of the LC composite component shown in FIG. 7. It is a disassembled perspective view of LC composite component which is 3rd Example of this invention. It is a disassembled perspective view of LC composite component which is 4th Example of this invention. It is a disassembled perspective view of LC composite component which is 5th Example of this invention. It is a disassembled perspective view of LC composite component which is 6th Example of this invention. It is a disassembled perspective view which shows the structure of the conventional band pass filter. FIG. 14 is an equivalent circuit diagram of the bandpass filter shown in FIG. 13.

  Hereinafter, embodiments of the LC composite component according to the present invention will be described with reference to the accompanying drawings.

(Refer 1st Example and FIGS. 1-6)
The external appearance of the LC composite component of the first embodiment of the present invention is shown in FIG. 1, its specific configuration is shown in FIG. 2, and its equivalent circuit is shown in FIG. This LC composite component 10 includes a first LC resonator Q1, a second LC resonator Q2, and a third inductor shown in FIG. 3 in a chip-like ceramic laminate 10a in which ceramic dielectric layers 11 to 18 are laminated. L3 is formed, and the first LC resonator Q1 and the second LC resonator Q2 are coupled by a grounded third inductor L3. 2 are all laminated and pressure-bonded with a ceramic green sheet formed of a dielectric ceramic material by a technique such as a doctor blade method or a pulling method, and fired to form a laminated body 10a. In this case, the ceramic green sheet is formed by sintering.

  As shown in FIG. 1, the input terminal P1 and the output terminal P2 are each formed in the opposing both end surface part of the laminated body 10a. Ground terminals G1 and G2 are formed on both side portions of the laminated body 10a, respectively. These input terminal P1, output terminal P2, and ground terminals G1 and G2 may be formed in advance by printing before the sintering of the ceramic green sheet, or may be formed after firing the laminated body 10a. The laminated body 10a is formed with a polarity mark 19 for identifying the input terminal P1 and the output terminal P2.

  On the main surface of the dielectric layer 12, as shown in detail in FIG. 4, the first inductor pattern 21 (first inductor L1) of the first LC resonator Q1 and the second inductor pattern 22 (first inductor) of the second LC resonator Q2 are provided. 2 inductor L2) and a third inductor pattern 23 (third inductor L3) are formed. Both the first inductor pattern 21 and the second inductor pattern 22 have a meander pattern shape. The third inductor pattern 23 is formed so as to couple the lead patterns 24 and 25 formed at the center portions of the pair of long sides facing each other of the rectangular main surface of the dielectric layer 12 to each other. And is led out to the ground terminals G1 and G2 through the lead-out patterns 24 and 25.

  The first inductor pattern 21 and the second inductor pattern 22 are formed symmetrically with respect to the third inductor pattern 23. The first inductor pattern 21 and the second inductor pattern 22 are connected at one end side to a common connection portion 26 formed at the center of the third inductor pattern 23, and the other end side of the dielectric layer 12. They are led out to the input terminal P1 and the output terminal P2 through lead patterns 27 and 28 formed at the center of each of the pair of sides on the main surface.

  In other words, the third inductor pattern 23 is provided so as to partition the dielectric layer 12 into two regions, the first inductor pattern 21 in one of the two regions, and the second inductor pattern in the other region. The first inductor pattern 21 and the second inductor pattern 22 are connected to the common connection portion 26 of the third inductor pattern 23. Further, the first inductor pattern 21 and the second inductor pattern 22 extend in a direction away from the common connection portion 26.

  As shown in FIG. 2, capacitor electrodes 31a, 32a, 33, 31b, and 32b that form coupling capacitors C3 and C4 of the equivalent circuit shown in FIG. 3 are formed on the principal surfaces of the dielectric layers 13 to 15, respectively. ing. The capacitor electrodes 31a and 31b are drawn to the input terminal P1 through the lead patterns 34a and 34b. The capacitor electrodes 32a and 32b are drawn to the output terminal P2 through the lead patterns 35a and 35b. The capacitance of the coupling capacitor C3 is formed between the capacitor electrodes 31a and 33 using the dielectric layer 13 as a dielectric, and between the capacitor electrodes 31b and 33 using the dielectric layer 14 as a dielectric. It is a parallel combined capacitance with capacitance. In addition, the capacitance of the coupling capacitor C4 is formed such that the dielectric layer 13 is formed as a dielectric between the capacitor electrodes 32a and 33, and the dielectric layer 14 is formed as a dielectric between the capacitor electrodes 32b and 33. This is a combined capacitance in parallel with the electrostatic capacitance.

  Capacitor electrodes 36, 37, and 38 that form capacitors C1, C2 of the first LC resonator Q1 and the second LC resonator Q2 of the equivalent circuit shown in FIG. 3 are formed on the main surfaces of the dielectric layers 16, 17, respectively. ing. The capacitance of the capacitor C1 is a capacitance formed between the capacitor electrodes 36 and 38 using the dielectric layer 16 as a dielectric. The capacitance of the capacitor C2 is a capacitance formed between the capacitor electrodes 37 and 38 using the dielectric layer 16 as a dielectric. The capacitor electrodes 36 and 37 are drawn out to the input terminal P1 and the output terminal P2 through the lead patterns 36a and 37a, respectively. The capacitor electrode 38 is drawn to the ground terminals G1 and G2 through the lead patterns 38a and 38b. In the equivalent circuit shown in FIG. 3, Lg represents a floating inductor included in the lead patterns 38a and 38b.

  In the LC composite component 10 described above, the first inductor pattern 21 of the first LC resonator Q1 and the second inductor pattern 22 of the second LC resonator Q2 are formed line-symmetrically with respect to the third inductor pattern 23. ing. For this reason, even if the LC composite component 10 is reduced in size, the third inductor pattern 23 is interposed between the first inductor pattern 21 and the second inductor pattern 22, so that the distance between both can be ensured. As a result, inductive coupling between the first inductor pattern 21 and the second inductor pattern 22 can be suppressed, and the Q values of the first LC resonator Q1 and the second LC resonator Q2 can be improved. Obtainable.

  Further, since the first inductor pattern 21 of the first LC resonator Q1 and the second inductor pattern 22 of the second LC resonator Q2 are grounded through the third inductor pattern 23, the first inductor pattern 21, the second inductor pattern 22, This inductive coupling can be controlled by the size of the inductor of the third inductor pattern 23. Thereby, the freedom degree of the design of the bandwidth of LC composite component 10 also becomes large.

  Incidentally, as a result of measuring the filter characteristics of the sample of the LC composite component 10 having the configuration described with reference to FIGS. 1 to 4, a filter characteristic indicated by a curve S11 in FIG. 6 was obtained. Further, as a result of measuring the filter characteristics of the conventional LC filter having the configuration of FIG. 13, the filter characteristics indicated by the curve S21 in FIG. 6 were obtained. As is clear from FIG. 6, it can be seen that the LC composite component 10 of the first embodiment has a narrow band filter characteristic in a high frequency band such as 4 to 6 GHz.

  Note that the common connection portion 26 to which one ends of the first and second inductor patterns 21 and 22 are connected is not necessarily one point, and has a slight length as shown as a modification in FIG. The one ends of the first and second inductor patterns 21 and 22 may be connected in an offset state.

(Refer to the second embodiment, FIGS. 7 and 8)
FIG. 7 shows an LC composite component according to the second embodiment of the present invention. The LC composite component 20 includes a first inductor pattern 21 and a second inductor pattern 21 formed on the dielectric layer 12 of the multilayer body 20a in the LC composite component 10 according to the first embodiment described with reference to FIGS. The inductor pattern 22 is formed so as to be point-symmetric with respect to the common connection portion 26 of the third inductor pattern 23. The other configuration is the same as that of the first embodiment. Therefore, in FIG. 7, the same reference numerals are given to the portions corresponding to FIG.

  In the LC composite component (multilayer balun transformer) 20 according to the second embodiment, the first inductor pattern 21 and the second inductor pattern 22 are connected to the common connection portion 26 of the third inductor pattern 23 as described above. The curved portion 29 of the first inductor pattern 21 is adjacent to the side on the ground terminal G1 side and the side on the ground terminal G2 side of the main surface of the dielectric layer 12. There may be a difference between the number and the number of the curved portions 29 of the second inductor pattern 22. As a result, the characteristic changes of the first LC resonator Q1 and the second LC resonator Q2 due to processing variations such as cut deviation and stacking deviation of the dielectric layer 12 about the common connection portion 26 that is the center of point symmetry are offset. Thus, the variation in the overall filter characteristics can be reduced.

  As in the first embodiment, the common connection portion 26 to which one ends of the first and second inductor patterns 21 and 22 are connected is not necessarily one point, and is shown as a modified example in FIG. In addition, the first and second inductor patterns 21 and 22 may have a slight length, and one ends of the first and second inductor patterns 21 and 22 may be connected in an offset state.

(Refer to the third embodiment, FIG. 9)
FIG. 9 shows an LC composite component according to a third embodiment of the present invention. This LC composite component 30 has a meander-like shape in each of the LC composite components 10 according to the first embodiment described with reference to FIGS. Each of the first inductor pattern 21 and the second inductor pattern 22 has an even number (four in FIG. 9) of curved portions 29. The other configuration is the same as that of the first embodiment. Therefore, in FIG. 9, the same reference numerals are given to the portions corresponding to FIG.

  In the LC composite component (laminated balun transformer) 30 according to the third embodiment, as described above, the first inductor pattern 21 and the second inductor pattern 22 formed on the dielectric layer 12 of the multilayer body 30a are provided. Since each of them has an even number of curved portions 29, the first inductor pattern is adjacent to each of the side on the ground terminal G1 side and the side on the ground terminal G2 side of the main surface of the dielectric layer 12. The number of curved portions 29 of 21 and the number of curved portions 29 of the second inductor pattern 22 are all equal. As a result, the characteristic changes of the first LC resonator Q1 and the second LC resonator Q2 due to processing variations such as cut displacement and stacking displacement of the dielectric layer 12 are canceled out, and variations in overall filter characteristics can be reduced. it can.

(Refer to the fourth embodiment, FIG. 10)
FIG. 10 shows an LC composite component according to the fourth embodiment of the present invention. This LC composite component 40 is the same as the LC composite component 10 of the first embodiment described with reference to FIGS. 1 to 4, but the first inductor pattern 21 and the second inductor pattern of the dielectric layer 12 described in FIG. 22 and the third inductor pattern 23 have a two-layer structure. That is, two dielectric layers 12a and 12b are used in place of one dielectric layer 12, and the first inductor pattern 21, the second inductor pattern 22 and the third inductor pattern are provided on these dielectric layers 12a and 12b. By forming the first inductor patterns 21a and 21b, the second inductor patterns 22a and 22b, and the third inductor patterns 23a and 23b, respectively, having the same pattern shape as that of the first inductor pattern 21, the first inductor pattern 21, the second inductor pattern 22 and The third inductor pattern 23 has a two-layer structure, and inductors L1a, L1b, L2a, L2b, L3a, and L3b are formed. The other configuration is the same as that of the first embodiment. Therefore, in FIG. 10, the same reference numerals are given to the portions corresponding to FIG. In addition, the code | symbol 40a was attached | subjected to the laminated body.

  In the LC composite component (laminated balun transformer) 40 according to the fourth embodiment, in addition to the effects exhibited by the LC composite component 10 according to the first embodiment, the first inductor pattern 21 and the second inductor pattern 22 are provided. Since it has a two-layer structure, the current density flowing through each of the first inductor patterns 21a and 21b and the second inductor patterns 22a and 22b is reduced, and the insertion loss of the LC composite component 40 can be reduced.

(Refer to the fifth embodiment, FIG. 11)
FIG. 11 shows an LC composite component that is a fifth embodiment of the present invention. This LC composite component 50 is the same as the LC composite component 10 according to the first embodiment described with reference to FIGS. 1 to 4, but the first inductor pattern 21 and the second inductor pattern of the dielectric layer 12 described with reference to FIG. 2. 22 is formed on one dielectric layer 12a, and the third inductor pattern 23 is formed on another dielectric layer 12b. The first inductor pattern 21 and the second inductor pattern 22 are connected to the common connection portion 26 of the third inductor pattern 23 through the via-hole conductor vh. Also in FIG. 11, parts corresponding to those in FIG. In addition, the code | symbol 50a was attached | subjected to the laminated body.

  In the LC composite component (laminated balun transformer) 50 according to the fifth embodiment, the third inductor pattern 23 is replaced with the first inductor pattern 21 in addition to the effects exhibited by the LC composite component 10 according to the first embodiment. And the second inductor pattern 22 is formed in a dielectric layer 12b different from the second inductor pattern 22, the area for the layout of the first inductor pattern 21 and the second inductor pattern 22 in the dielectric layer 12a increases. The degree of freedom in design is also increased.

(See the sixth embodiment, FIG. 12)
FIG. 12 shows an LC composite component according to the sixth embodiment of the present invention. The LC composite component 60 is the same as the LC composite component 10 according to the first embodiment described with reference to FIGS. 1 to 4, and the first inductor pattern 21 and the second inductor pattern 22 are each of the winding type. The first inductor pattern 21 and the second inductor pattern 22 are both formed by being divided into two dielectric layers 12a and 12b.

  That is, the first inductor pattern 21 is divided into dielectric layers 12a and 12b and formed as winding-type divided patterns 21a and 21b, and these divided patterns 21a and 21b are electrically connected by the via-hole conductor vh1. . Similarly, the second inductor pattern 22 is divided into dielectric layers 12a and 12b and formed as winding-type divided patterns 22a and 22b. These divided patterns 22a and 22b are electrically connected by a via-hole conductor vh2. Yes. Also in FIG. 12, the same reference numerals are given to portions corresponding to those in FIG. In addition, the code | symbol 60a was attached | subjected to the laminated body.

  In the LC composite component 60 of the sixth embodiment, each of the first inductor pattern 21 and the second inductor pattern 22 is of a winding type, and both the first inductor pattern 21 and the second inductor pattern 22 are 2 Since the dielectric layers 12a and 12b are formed separately, the inductance values of the first inductor L1 and the second inductor L2 can be increased even if the sizes of the dielectric layers 12a and 12b are reduced. it can. Thereby, the LC composite component 60 can be further reduced in size.

(Other examples)
The LC composite component according to the present invention is not limited to the above-described embodiments, and various configurations can be made within the scope of the gist thereof.

  For example, in the fourth embodiment described with reference to FIG. 10, the first inductor pattern and the second inductor pattern may be formed on three or more dielectric layers. Further, in the sixth embodiment described with reference to FIG. 12, the one inductor pattern and the second inductor pattern may be divided and formed over three or more dielectric layers.

  As described above, the present invention is useful for LC composite parts including a bandpass filter, a lowpass filter and / or a highpass filter used in a high frequency band, and is particularly excellent in that the degree of freedom in design is high.

Claims (12)

A first LC resonator composed of a first inductor pattern and a first capacitor pattern, and a second LC resonator composed of a second inductor pattern and a second capacitor pattern inside a multilayer body formed by stacking a plurality of dielectric layers. and a plurality of coupling constituting a coupling capacitor for coupling a third inductor pattern the a first 1LC resonator and the second 2LC resonator is and having connected to ground, and said second 2LC resonator and the second 1LC resonator An LC composite component including a capacitor pattern , one ground electrode, and a ground terminal formed on a side surface of the multilayer body ,
The first and second inductor patterns are at least partially formed on the same dielectric layer, and have one end connected to the common connection portion of the third inductor pattern and the other end facing each other. Pulled out to the side of the laminate,
The first, second and third inductor patterns are arranged substantially symmetrically with respect to the common connection;
The coupling capacitor pattern is formed on a dielectric layer adjacent to the dielectric layer on which the first, second, and third inductor patterns are formed. When viewed from the stacking direction, any one of the first and second inductor patterns is formed. Only the heels overlap,
The ground electrode is connected to the ground terminal by a lead pattern having a predetermined inductance, and a series LC resonator is formed by the lead pattern and the first and second capacitor patterns.
The first and second capacitor patterns are formed on a dielectric layer different from the first, second, and third inductor patterns, and the first, second, and third inductors are sequentially formed from the top of the multilayer body. A pattern, the first and second capacitor patterns, and the ground electrode are formed;
LC composite parts characterized by A first LC resonator composed of a first inductor pattern and a first capacitor pattern, and a second LC resonator composed of a second inductor pattern and a second capacitor pattern inside a multilayer body formed by stacking a plurality of dielectric layers. and a plurality of coupling constituting a coupling capacitor for coupling a third inductor pattern the a first 1LC resonator and the second 2LC resonator is and having connected to ground, and said second 2LC resonator and the second 1LC resonator An LC composite component including a capacitor pattern, one ground electrode, and a ground terminal formed on a side surface of the multilayer body ,
The third inductor pattern is provided so as to partition the multilayer body into two regions when seen through from the stacking direction of the dielectric layer,
The first inductor pattern is provided in one of the two regions, and the second inductor pattern is provided in the other region.
The first and second inductor patterns are at least partially formed on the same dielectric layer, and have one end connected to the common connection portion of the third inductor pattern and the other end facing each other. Pulled out to the side of the laminate ,
The first, second and third inductor patterns are arranged substantially symmetrically with respect to the common connection;
The coupling capacitor pattern is formed on a dielectric layer adjacent to the dielectric layer on which the first, second, and third inductor patterns are formed. When viewed from the stacking direction, any one of the first and second inductor patterns is formed. Only the heels overlap,
The ground electrode is connected to the ground terminal by a lead pattern having a predetermined inductance, and a series LC resonator is formed by the lead pattern and the first and second capacitor patterns.
The first and second capacitor patterns are formed on a dielectric layer different from the first, second, and third inductor patterns, and the first, second, and third inductors are sequentially formed from the top of the multilayer body. A pattern, the first and second capacitor patterns, and the ground electrode are formed;
LC composite parts characterized by   3. The LC composite component according to claim 2, wherein the first inductor pattern and the second inductor pattern extend in a direction away from a common connection portion of the third inductor pattern. The LC composite component according to any one of claims 1 to 3, wherein the first inductor pattern and the second inductor pattern are arranged substantially point-symmetrically with respect to the common connection portion. The LC composite component according to any one of claims 1 to 3, wherein the first inductor pattern and the second inductor pattern are arranged substantially line-symmetrically with respect to the common connection portion. The LC composite component according to any one of claims 1 to 5 , wherein the first inductor pattern and the second inductor pattern have a meandering pattern shape. The LC composite component according to claim 6 , wherein each of the first inductor pattern and the second inductor pattern has an even number of curved portions. It said first inductor pattern and the second inductor pattern, LC composite component according to any one of claims 1 to 5, characterized in that a winding pattern. The LC composite component according to any one of claims 1 to 8 , wherein the first inductor pattern and the second inductor pattern are formed over a plurality of dielectric layers. The third inductor pattern, LC composite according to any one of claims 1 to 9, characterized in that it is formed on the first inductor pattern and the second inductor pattern and the same dielectric layer parts. The third inductor pattern, according to claim 1 to claim 9, characterized in that it is formed on different dielectric layers from the first inductor pattern and the second inductor pattern formed dielectric layer LC composite part in any one. The laminated body is formed by laminating rectangular dielectric layers, and the third inductor pattern has a straight line portion connecting the central portions of two opposing sides, and the straight line portion is approximately at the center of the straight line portion. LC composite component according to any one of claims 1 to 11, characterized in that the common connection portion is positioned.

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