JPH02224313A - Lc composite part - Google Patents

Abstract

PURPOSE:To contrive miniaturization and to obtain high degree of coupling by a method wherein a coupling adjustment electrode layer, with which the degree of magnetic coupling of the coil element of both resonators will be adjusted, is interposed between the upper and the lower adjacent resonators. CONSTITUTION:After a protective layer 1 with a shield electrode film 2 formed on the upper surface, a sheet layer 3, a resonator 7 having conductive patterns 4 and 6 formed on the upper and the lower main surfaces 12a and 12b of a dielectric layer 5, a sheet layer 8 having a coupling adjustment electrode layer 9 formed on the upper surface, a sheet layer 10, a resonator 14 having conductive patterns 11 and 13 formed on the upper and the lower main surfaces 12a and 12b of a dielectric layer 12, a sheet layer 15 with a shield electrode film 16 formed on the upper surface and a protective film 17, are laminated successively, and then they are sintered in one body. As a result, the geometric average distance between resonator is made shorter, the degree of magnetic coupling of both resonators is enhanced in the amount of the above-mentioned reduction in distance, the coupling degree can be adjusted easily according to intended purposes, and miniaturization can also be accomplished easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an LC composite component such as a filter in which conductive patterns are formed on both main surfaces of a dielectric layer.

Conventional Art (2) Narrowing Conventionally, the structure shown in FIG. 7 is known as the above-mentioned filter. That is, four U-shaped conductive patterns 21, 22, 23.2 are placed on the left and right sides of the front and back main surfaces 20a, 20b of the dielectric layer 20 made of a ceramic substrate.
4 is formed, and a conductive pattern 21 formed on the left upper surface.
A ground terminal 25° 26 is connected to the conductive pattern 24 formed on the lower right surface, an input terminal 27 is connected to the conductive pattern 23 formed on the lower left surface, and an input terminal 27 is connected to the conductive pattern 22 formed on the upper right surface. An output terminal 28 is connected.

Portions 21a and 23a, 21b and 23b of the two left conductive patterns 21.23 that face each other with the dielectric layer 20 in between form capacitors C1l and C12, and one non-opposed portion 21c and 23c form coils L11. As shown on the left side of FIG. 8, the two capacitors C1l and C12 and the coils Lll and L12 form a resonator Q.
Configure ll.

Also, in the two pattern electrodes 22 and 24 on the right side, portions 22a and 24a facing each other with the dielectric layer 20 in between,
22b and 24b form capacitors C13' and C14, and one non-opposing portion 22c24c forms a coil L1, respectively.
3. As shown on the left side of FIG. 8, two capacitors C13, C14 and a coil L13. L1
4 constitutes a resonator Q12. And coil L1
Since the parts 21c and 24c forming 1°Li2 are placed close to each other, inductive coupling occurs between them, and both resonators Qll,
Q12 is mainly magnetically coupled as shown by M (there is also some capacitive coupling). In addition, L25. L26 is the inductance of the ground terminals 25 and 26.

However, when two adjacent resonators are coupled in this way, the coil Lll, which contributes to the magnetic coupling,
Since there is a limit to the approach distance between the corresponding portions 21c and 24c of L13, there is a limit to the degree of coupling. Furthermore, since the filter has a planar structure in which resonators are arranged in parallel, the size of the filter depends on the number of stages in which the resonators are arranged in parallel, making it difficult to reduce the size of the filter.

The present invention has been made to solve such problems,
It is possible to reduce the size by giving a degree of freedom to the coupling between the resonators, and
An object of the present invention is to provide an LC composite part that can obtain a high degree of bonding.

The LC composite component according to the present invention for the purpose of A coupling adjustment electrode layer for adjusting the degree of magnetic coupling between the coil elements of both resonators is interposed between the resonators.

In the present invention, since the resonators are stacked in the vertical direction,
The geometric average distance between each resonator is shortened, which makes the coupling stronger, and since a coupling adjustment electrode layer is formed between each resonator, the desired degree of coupling can be adjusted depending on the intended use. can be obtained.

However, Fig. 2 is an external perspective view showing a bandpass filter to which the present invention is applied, Fig. 1 is a cross-sectional view taken along line A-A' in Fig. 2, and Fig. 3 is a cross-sectional view of the bandpass filter to which the present invention is applied. It is an exploded perspective view. For example, as shown in FIG. 3, the product of the present invention includes a protective layer 1 on which a shield electrode film 2 is formed, a sheet layer 3, and conductive patterns 4 on upper and lower main surfaces 5b and 5a of a dielectric layer 5. , 6 formed thereon; a sheet layer 8 having a coupling adjustment electrode layer 9 formed on its upper surface; a sheet layer 10; 13, a sheet layer 15 on which a shield electrode film 16 is formed, and a protective layer 17 are sequentially laminated on the upper side and then integrally fired to form a structure as shown in FIG. It becomes.

As shown in FIG. 2, ground terminals 18a, 18b and input/output terminals 19a, 19b are formed at the four corners of the laminated rectangular plate-shaped product of the present invention.

The above two protective layers 1.17 and the four sheet layers 3°8.1
0.15 is made of a dielectric or an insulator, and the two shield electrode films 2.16 are made of metal such as copper or aluminum.

Resonator 7 includes upper and lower main surfaces 5b of dielectric 115.

U-shaped conductive patterns 4.6 are formed in opposite directions on 5a. Each conductive pattern 4.6 consists of two capacitor electrode patterns 4a, 4b, 6a, 6b and one coil pattern 4c, 6c. Among these, the capacitor electrode patterns 4a and 6a, 4b and 6b are opposed to each other with the dielectric layer 5 interposed therebetween, and the dielectric constant and thickness of the dielectric layer 5 are
Capacitors C1 and C2 are formed with capacities determined by the opposing areas of the capacitor electrodes. On the other hand, the coil patterns 4c and 6c form coils LL and L2 at high frequencies.

Note that 4d is a tongue piece formed on the conductive pattern 4 to be connected to the output terminal 19b, and 6d is a tongue piece formed on the conductive pattern 6 to be connected to the ground terminal 18a.

In the above configuration, the conductive patterns 4.6 facing each other on the front and back surfaces of the dielectric layer 5 connect the capacitor C2 to an LC series circuit in which coils Ll and L2 are connected on both sides of the first capacitor C1, as shown in FIG. A resonator Q1 is constituted by equivalent circuits connected in parallel.

The resonator 14 has a configuration in which the resonator 7 is horizontally rotated by 180 degrees, and the upper and lower main surfaces t2b of the dielectric layer 12
, 12a, U-shaped conductive patterns 11.13 are formed in opposite directions. Each conductive pattern 11.13 has two capacitor electrode patterns lla, llb, 13a, 1
3b and one coil pattern llc, 13c.

Among these, capacitor electrode patterns lla, 13a, l
lb and 13b are opposed to each other with the dielectric layer 12 in between,
Capacitors C3 and C4 are formed with capacities determined by the dielectric constant and thickness of the dielectric layer 12 and the opposing areas of the capacitor electrodes. On the other hand, the coil patterns llc and 13c form coils L3 and L4 at high frequencies. Note that lid is a tongue piece formed on the conductive pattern 11 to be connected to the input terminal 19a, and 13d is a tongue piece formed on the conductive pattern 13 to be connected to the ground terminal 18b.

In the above configuration, the conductive patterns 11.13 that face each other on the front and back surfaces of the dielectric layer 12 are connected to the LC with coils L3 and L4 connected to both sides of the first capacitor C3, as shown in FIG.
A resonator Q2 is constituted by an equivalent circuit in which a capacitor C4 is connected in parallel to a series circuit.

Note that this resonator 14 has a configuration in which the resonator 7 is rotated by 180 degrees in the horizontal direction, so a coil pattern 13c is similarly placed above the coil patterns 4c and 6c of the resonator 7.
, lie is located.

The coupling adjustment electrode layer 9 is for adjusting the degree of coupling between the two resonators 7.14 disposed above and below with the coupling adjustment electrode layer 9 in between. This coupling adjustment electrode layer 9 is made of a metal with low magnetic permeability, such as Cu. Therefore, each coil pattern 4c,
The magnetic lines of force generated by 13c, 6c, and 11C are blocked by the coupling adjustment electrode layer 9. However, each coil pattern 4c, 13c, 6c, 11
By changing the area or shape of this electrode gap 9a, two coil patterns 4c located above and below can be formed, as shown in FIG. 13c, 6c and ll
The degree of bonding of c can be adjusted. In other words,
The coupling degree of the two resonators 7.14 arranged above and below is adjusted by the coupling adjustment electrode layer 9 depending on the intended use.

Note that the resonators 7 and 14 are arranged one above the other, and the geometric average distance is shorter than in the conventional case where they are arranged side by side, and the degree of coupling is significantly increased. Therefore, there is no problem even if the coupling adjustment electrode layer 9 is interposed between the two.

FIG. 4 shows an equivalent circuit of a bandpass filter consisting of the resonators 7 and 14 coupled in this manner. Incidentally, magnetic coupling also exists between the coil portions of the resonators 7 and 14 located diagonally above and below.

Incidentally, the strength of the magnetic coupling can also be changed depending on the size of the electrode gap 9a.

FIG. 6 is a graph showing the frequency characteristics of the filter when the size of the electrode gap 9a is changed in two levels, where ■ is the case when the electrode gap 9a is made larger, and ■ is when it is made smaller.

As can be understood from this figure, the electrode gap 9a is made thicker (
In case (2), the center frequency can be lowered, that is, the degree of coupling can be increased. On the other hand, in case (2) in which the electrode gap 9a is made small, the center frequency becomes high and the degree of coupling can be made small.

The coupling adjustment electrode layer 9 not only couples the resonators 7 and 14, but also has a shielding effect like the shield electrode film 2.16.

Furthermore, although the above embodiment shows a case in which two resonators are stacked one above the other, the present invention can also be applied to a bandpass filter consisting of three or more stages of resonators, in which three or more resonators are stacked one above the other. Of course it is possible.

In this case as well, the size of the filter is approximately the same as one resonator.

Furthermore, the present invention is not limited to bandpass filters, but can also be applied to other LC filters.
The same applies to composite parts.

As detailed above, in the case of the present invention, since the resonators are stacked in the vertical direction, the geometric average distance between the resonators is short, and the magnetic In addition to increasing the degree of coupling, since a coupling adjustment electrode layer is formed between each resonator, the degree of coupling can be easily adjusted depending on the intended use, making it possible to obtain an LC composite component with high utility value. can.

4. Furthermore, since each resonator is stacked, it also has the effect of realizing miniaturization.

[Brief explanation of the drawing]

FIG. 1 is a sectional view taken along line AA' in FIG. 2, and FIG. 2 is an external perspective view showing a bandpass filter to which the present invention is applied.
Figure 3 is an exploded perspective view of the same, Figure 4 is its equivalent circuit diagram, Figure 5 is a schematic diagram showing the coupling state of the bandpass filter, and Figure 6 is the size of the electrode gap provided in the coupling adjustment electrode layer. FIG. 7 is a plan view showing the configuration of a conventional band-pass filter, and FIG. 8 is an equivalent circuit diagram of the band-pass filter. 5.12...Dielectric layer, 5a, 5b, 12a, 12b
... Main surface, 4, 6, 11.13 ... Conductive pattern, 7.14 ... Resonator, 9 ... Coupling adjustment electrode layer, 9
a... Electrode cavity.

Claims (1)

[Claims] (1) Two or more resonators in which LC circuits are formed using conductive patterns formed on both main surfaces of the dielectric layer are stacked, and the magnetic field of the coil elements of both resonators is placed between the vertically adjacent resonators. An LC composite component characterized in that a bond adjustment electrode layer is interposed to adjust the degree of bond.