JP2003332806A - Stacked dielectric filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a stacked dielectric filter is hard to make small with a high performance. <P>SOLUTION: A stripline resonator constituting this stacked dielectric filter comprises a plurality of dielectric layers and a plurality of stripline conductor layers 13, 16 and 19. The plurality of stripline conductor layers 13, 16 and 19 face one another through the dielectric layers. Ground conductor layers 22 and 25 are arranged opposedly to the plurality of stripline conductor layers 13, 16 and 19. One end of each of the stripline conductor layers is electrically connected to the ground conductor layers 22 and 25. The other end of each of the stripline conductor layers is separated by the dielectric layers. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a laminated dielectric filter suitable for use in a mobile communication device.

[0002]

2. Description of the Related Art It is known to use a laminated filter as a bandpass filter, a lowpass filter or the like of a mobile communication device such as a mobile phone. In this multilayer filter, a stripline conductor layer, a coupling capacitor conductor layer, and a shield ground conductor layer are embedded in a dielectric, and an input terminal conductor layer, an output terminal conductor layer, and a ground terminal conductor are formed on the outer peripheral surface of the dielectric body. And layers.

[0003]

By the way, there is a demand for further miniaturization and higher performance of laminated dielectric filters.

Therefore, an object of the present invention is to provide a laminated dielectric filter having a high Q and a reduced conductor loss.

[0005]

The present invention for achieving the above object will be described with reference to the drawings, which show embodiments. It should be noted that reference signs in the description of the present invention and claims are for the purpose of helping understanding of the present invention, and do not limit the present invention. The present invention relates to a dielectric (2) composed of a plurality of dielectric layers, at least first and second stripline conductor layers (13, 16) embedded in the dielectric (2) and arranged to face each other, and the first
And a ground conductor layer (22 or 25 or 22, 25) arranged to face the second strip conductor layer (13, 16)
A laminated dielectric filter comprising a stripline resonator (L1) consisting of: a first dielectric layer and a second dielectric layer, wherein the first and second stripline conductor layers (13, 16) are arranged to face each other via a dielectric layer; One ends of the first and second stripline conductor layers (13, 16) are electrically connected to the ground conductor layer (22), and the other ends of the first and second stripline conductor layers (13, 16). The present invention also relates to a laminated dielectric filter characterized in that its ends are not connected to each other and are separated by a dielectric layer. Note that claim 2
, The first stripline conductor layer (1
It is desirable to dispose a conductor layer with a dielectric layer between 3) and the second stripline conductor layer (16). Further, as described in claim 3, the ground conductor layer is composed of first and second ground conductor layers (22, 25) arranged to face each other, and the first and second stripline conductor layers ( 13, 16) are the first and second
Is preferably disposed between the ground conductor layers (22, 25). Further, as shown in claim 4, wherein the first strip line conductor layer (13) the width (W ₁₎ is the second stripline conductor layer (16) the width (W ₂₎
It is desirable to be different from.

[0006]

According to the inventions of the respective claims, since one stripline resonator is equivalently constituted by a plurality of stripline conductor layers, the conductor loss is reduced and the Q characteristic is improved. Further, according to the invention of claim 4, it is possible to prevent the characteristic variation due to the pattern shift of the conductor layer.

[0007]

[First Embodiment] Referring to FIGS. 1 to 7, a laminated dielectric used as a bandpass filter at a frequency higher than the VHF band in a mobile communication device according to a first embodiment of the present invention. The body filter will be described. The completed multilayer dielectric filter 1 schematically shown in FIG. 1 includes a rectangular parallelepiped ceramic dielectric 2 having a relative dielectric constant of 30 or more, and first and second input / output terminal conductor layers as external signal terminal conductor layers. 3 and 4, a pair of external ground terminal conductor layers 5 and 6, and further an internal conductor layer embedded in the dielectric 2. The dielectric 2 is the first
And a second major surface 7, 8 and first, second, third and fourth side surfaces 9, 10, 11, 12 are hexahedrons. The input / output terminal conductor layers 3 and 4 are the first and second side surfaces 9 of the dielectric 2.
It is provided in the center of 10 in a strip shape, and a part of this is provided in the first and second areas.
Overhangs the main surfaces 7, 8. The ground terminal conductor layers 5 and 6 are provided on the third and fourth side surfaces 11 and 12 of the dielectric 2, and a part of the ground terminal conductor layers 5 and 6 is formed on the first and second main surfaces 7 and 8.
And the upper and lower surfaces of the second side surfaces 9 and 10.

The laminated dielectric filter 1 of this embodiment is shown in FIG.
It is formed so that the equivalent circuit shown in FIG. Figure 5
In, the input terminal T1 is connected to the first stripline resonator L1 via the input coupling capacitor C1, and the output terminal T2 is connected to the second stripline resonator L2 via the output coupling capacitor C2. The third stripline resonator L3 is arranged between the first and second stripline resonators L1 and L2, and M
They are coupled (inductively coupled) and are coupled by the first and second inter-resonator coupling capacitors C7 and C8. First, second and third stripline resonators L1 and L2
, L3 has one end connected to the ground. The other end of the third stripline resonator L3 is connected between the first and second inter-resonator coupling capacitors C7 and C8 via a trapping capacitor C9. Also, the capacitors C3, C4, and C10 for obtaining the wavelength shortening capacitance are the first,
Second and third stripline resonators L1, L2, L
Connected in parallel to 3 and. The stray capacitance (stray capacitance) between the input terminal T1 and the ground is indicated by a broken line at C5, and the stray capacitance between the output terminal T2 and the ground is indicated by a broken line at C6. The input terminal T1, the output terminal T2, and the ground of FIG.
Corresponding to the first input / output terminal conductor layer 3, the second input / output terminal conductor layer 4, and the ground terminal conductor layers 5 and 6.

In order to obtain the circuit of FIG. 5, a large number of conductor layers are embedded in the dielectric 2 as shown in FIGS.
The dielectric 2 is obtained by printing a conductive paste (eg, silver paste) on a ceramic green sheet (porcelain green sheet) in a predetermined pattern shown in FIG. 4, and stacking and printing the same. The green sheets are integrated with each other after firing, but in FIG. 4, the first, second, third, fourth, and
Fifth, sixth, seventh, eighth, ninth and tenth dielectric layers 2
a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2
It is shown divided into i and 2j. Inner conductor layer is dielectric 1
The first, second, third, fourth, fifth, sixth and seventh thickness direction positions H1, H between the first and second main surfaces 7, 8 of
2, H3, H4, H5, H6, H7.
The inner conductor layers may be modified at the eighth and ninth positions H8 and H9 in the thickness direction.

Next, the pattern of each layer will be described. The first, second, and third stripline conductor layers 13 and 1 are provided on the surface of the fourth dielectric layer 2d at the first position H1 in the thickness direction.
4, 15 are arranged so as to extend linearly from the third side surface 11 toward the fourth side surface 12. Further, on the surface of the sixth dielectric layer 2f at the second position H2 in the thickness direction,
Fourth, fifth and sixth stripline conductor layers 16, 1
7, 18 are arranged so as to extend linearly from the third side surface 11 toward the fourth side surface 12. Further, on the surface of the eighth dielectric layer 2h at the third position H3 in the thickness direction,
Seventh, eighth and ninth stripline conductor layers 19, 2
0 and 21 are arranged so as to linearly extend from the third side surface 11 toward the fourth side surface 12. The first, second and third thickness direction positions H1, H2, H3 are at different height positions, and the second thickness direction position H2 is between the first and third thickness direction positions H1, H3. And the first position H1 in the thickness direction is the first main surface 7 and the second position H in the thickness direction.
2 and the third thickness direction position H3 is between the second principal surface 8 and the second thickness direction position H2. 1st-9th
One ends of the stripline conductor layers 13 to 21 are connected to the first ground terminal conductor layer 5, respectively. When viewed from a direction perpendicular to the first main surface 7, that is, in a plan view,
First, fourth and seventh stripline conductor layers 13, 1
6 and 19 are arranged so as to overlap each other, and their combination provides the first stripline resonator L1 of FIG. The second, fifth, and eighth stripline conductor layers 14, 17 and 20 are arranged so as to overlap each other when seen in a plan view, and by combining these, the second stripline resonance of FIG. A container L2 is provided. The third, sixth and ninth stripline conductor layers 15, 18 and 21 are arranged so as to overlap each other when seen in a plan view, and by combining these, the third stripline resonance shown in FIG. A container L3 is provided. As is apparent from FIG. 3, the first, second, and third stripline conductor layers 13, 14, 15 at the first position H1 in the thickness direction.
Width, and third, seventh, eighth and ninth positions H3 at the position H3 in the thickness direction.
The width W1 of the stripline conductor layers 19, 20, 21 is slightly smaller than the width W2 of the fourth, fifth and sixth stripline conductor layers 16, 17, 18 at the second position H2 in the thickness direction. Therefore, even if the green sheets are misaligned, the first, second and third positions H1, H2 in the thickness direction,
The fluctuation of the coupling degree of the H3 stripline conductor layer can be suppressed to a small level.

The second dielectric layer 2 serving as the fourth thickness-direction position H4 between the first major surface 7 and the first thickness-direction position H1.
The first ground conductor layer 22 and the first and second additional conductor layers 23 and 24 are provided on the surface of b. The first ground conductor layer 22 is provided to obtain an internal shield action and a stripline action, and is formed in a large area so as to connect the long sides of the pair of the second dielectric layers 2b. , The first, the second, and the third stripline conductor layers 13, 14, 15 facing each other in plan view, one end and the other end of which are the ground terminal conductor layer 5 of the third and the fourth side faces 11, 12. , 6 are connected. The first and second additional conductor layers 23 and 24 are the short sides of the pair of the second dielectric layers 2b (first
And second side surfaces) are formed so as to project toward the opposite sides (side surfaces) from the center of the first and second side surfaces 9 and 10. Connected to layers 3, 4. Since the additional conductor layers 23 and 24 face the ground conductor layer 22 with a predetermined gap, a stray capacitance can be obtained between them. Ground conductor layer 2
Since the second and the first and second additional conductor layers 23 and 24 are formed by printing the conductor paste on the same green sheet (porcelain green sheet) at the same time, variations in the mutual positional relationship hardly occur during mass production. For example, the ground conductor layer 2
When 2 shifts to the right side in FIG. 4, the additional conductor layers 23 and 24 also shift to the right side, and eventually the gap between them does not change. Therefore, variations in the stray capacitance of the input / output terminal conductor layers 3 and 4 with respect to the ground are reduced.

A second ground conductor layer 25 and a second ground conductor layer 25 are formed on the surface of the tenth dielectric layer 2j, which is the fifth thickness-direction position H5 between the third thickness-direction position H3 and the second principal surface 6. The third and fourth additional conductor layers 26 and 27 are provided. The second ground conductor layer 25 and the third and fourth additional conductor layers 26,
27 is formed in the same pattern as the first ground conductor layer 22 and the first and second additional conductor layers 22 in a plan view, and has the same function as these. The second ground conductor layer 25 is composed of the first and second ground terminal conductor layers 5,
6, and the third and fourth additional conductor layers 26 and 27 are connected to the first and second input / output terminal conductor layers 3 and 4.

The first and second input / output capacitance conductor layers are formed on the surface of the fifth dielectric layer 2e which is the sixth position H6 in the thickness direction between the first and second positions H1 and H2 in the thickness direction. 28,
29 and the first, second and third wavelength shortening capacitive conductor layers 3
0, 31, and 32 are arranged. The first input / output capacitance conductor layer 28 is the first, fourth, and seventh stripline conductor layers 13, 1 when seen in a plan view, as is apparent from FIG.
The first input / output terminal conductor layer 3 on the first side face 9 is formed so as to have a portion overlapping with 6 and 19.
The second input / output capacitance conductor layer 29 has the second and fifth capacitances when viewed two-dimensionally.
And the eighth stripline conductor layers 14, 17 and 20 are formed so as to overlap with each other and are connected to the second input / output terminal conductor layer 4 on the second side face 10. The input coupling capacitor C1 of FIG. 5 is obtained between the first input / output capacitance conductor layer 28 and the first and fourth stripline conductor layers 13 and 16, and the input coupling capacitor C1 of the second input / output capacitance conductor layer 29 is obtained. Second
And between the fifth stripline conductor layer and 14, 17 the output coupling capacitor C2 of FIG. 5 is obtained. In the present application, the conductor layer 28 is not called an input capacitance conductor layer, the conductor layer 29 is not called an output capacitance conductor layer, the conductor layer 3 is not called an input terminal conductor layer, and the conductor layer 4 is not called an output terminal conductor layer. The output terminal conductor layer is referred to as the laminated dielectric filter 1
Is formed symmetrically, and the conductor layers 3, 4, 28, 29 can be used for both the input side and the output side. Therefore, input / output in the present application means input or output.

The first dielectric layer 2e of the fifth dielectric layer 2e is viewed in plan view.
The wavelength shortening capacitance conductor layer 30 is formed so as to have a portion overlapping the first, fourth and seventh stripline conductor layers 13, 16 and 19, and the second wavelength shortening capacitance conductor layer 31 is The third wavelength shortening capacitance conductor layer 32 is formed so as to have a portion overlapping the second, fifth and eighth stripline conductor layers 14, 17, 20. Stripline conductor layers 15, 18, 21
Is formed so as to have a portion overlapping with. Since one ends of the first, second and third wavelength shortening capacitance conductor layers 30, 31, 32 are respectively connected to the second ground terminal conductor layer 6 of the fourth side face 12, they are equivalently shown in FIG. To provide capacitors C3, C4, C10.

An inter-resonator capacitance conductor layer 33 is arranged on the surface of the seventh dielectric layer 2g which is the seventh position H7 in the thickness direction between the second and third positions H2 and H3 in the thickness direction. ing. The inter-resonator coupling capacitance conductor layer 33 is arranged so as to overlap all of the first to ninth stripline conductor layers 13 to 21 when seen in a plan view, and equivalently, the coupling capacitors C7 and C8 of FIG. And the protrusion 34 acts as a capacitor C9. It should be noted that the first, second and third stripline conductor layers 13, 14 and 15 are mutually connected, and the fourth, fifth and sixth stripline conductor layers 1 are
6, 7, 18 and the seventh, eighth, and ninth stripline conductor layers 19, 20, 21 are close to each other so as to be inductively coupled. Therefore, the first, second and third stripline resonators L1, L2 and L3 are coupled by both capacitive coupling and inductive coupling.

FIG. 6 equivalently shows the function of the first wavelength-shortening capacitive conductor layer 30. The first stripline resonator L1 consisting of the first, fourth and seventh stripline conductor layers 13, 16 and 19 can be equivalently represented by a parallel resonance circuit of an inductance La and a capacitor Ca. The capacitor C3 based on the wavelength shortening capacitive conductor layer 30 is connected in parallel with the capacitor Ca. In FIG. 6, if La is L and Ca + C3 is C, the resonance frequency f0 is 1 /
It can be represented by {(2π) (LC) ^1/2 }. Therefore, as shown in FIG. 7, the resonance frequency f0 decreases as the capacitance C3 increases. That is, when the wavelength shortening capacitor C3 is provided, the stripline conductor layers 13 and 1 are provided.
The resonance frequency f0 can be lowered without changing the lengths of 6 and 19. If the capacitance C3 is increased when the resonance frequency f0 is kept constant, the length of the stripline conductor layer 13 can be shortened, and the same effect as shortening the wavelength can be obtained. The second and third wavelength shortening capacitance conductor layers 31 and 32 can also provide the same effect as the first wavelength shortening capacitance conductor layer 30.

By the way, the first, second and third wavelength shortening capacitance conductor layers 30, 31, 32 are the first, second and third stripline conductor layers 13, 14, 15 and the fourth, fifth.
And the sixth stripline conductor layers 16, 17 and 18 are arranged so that the stripline conductor layers are opposed to the stripline conductor layers as compared with the conventional one in which the stripline conductor layers of each stage of the multistage filter are configured by one. The area to be doubled,
The equivalent capacitors C3, C4, and C10 also double the capacity, and the wavelength shortening effect is increased, and the resonance frequency f
In order to obtain 0, it is possible to shorten the length of the stripline conductor layers 13 to 21 and narrow the width of the laminated dielectric filter 1 in the extending direction of the stripline conductor layers 13 to 21 to achieve miniaturization. Therefore, the area occupied by the multilayer dielectric filter 1 on the circuit board can be reduced. Further, in order to obtain the same resonance frequency as in the conventional case, the area of the wavelength shortening capacitance conductor layers 30, 3, 32 should be reduced to reduce the mutual interference between the input / output capacitance conductor layers 28, 29, etc.
Alternatively, the entire filter can be downsized. Further, the input / output capacitance conductor layers 28 and 29 are connected to the stripline conductor layer 1
Since it is arranged between 3, 16 and 14, 17, the line of electric force is not shielded and the no-load Q can be increased.

[0018]

[Second Embodiment] Next, a laminated dielectric filter of a second embodiment will be described with reference to FIG. However, in FIG. 8, the substantially same parts as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 8, the fifth and seventh dielectric layers 2
e and 2g are the same as the first to sixth stripline conductor layers 13 to 18 of the fourth and sixth dielectric layers 2d and 2f of FIG. The fourth dielectric layer 2d shown in FIG. 8 is provided with the same material as the fifth dielectric 2e shown in FIG. In FIG. 8, those corresponding to the stripline conductor layers 19, 20, 21 of the eighth dielectric layer 2h of FIG. 4 are omitted, and instead, the resonator coupling capacitance conductor layers 33c, 33 are replaced.
d is provided. Therefore, in FIG. 8, the first, second, third and fourth inter-resonator coupling capacitance conductor layers 3 are shown as corresponding to the inter-resonator coupling capacitance conductor layer 33 of FIG.
It has 3a, 33b, 33c and 33d. First and second
The inter-resonator coupling capacitance conductor layers 33a and 33b are provided on the surface of the sixth dielectric layer 2f at the position H2 in the thickness direction.
The conductor layer 33a on the left half in plan view includes the first, third, and fourth conductor layers 33a.
And the sixth stripline conductor layers 13, 15, 16,
The conductor layer 33b in the right half, which is opposed to 18, is the second, third, fifth and sixth stripline conductor layers 14, 15 and 1.
It faces 7 and 18. The third and fourth resonator coupling capacitance conductor layers 33c and 33d are provided on the surface of the eighth dielectric layer 2h at the position H3 in the thickness direction. The third inter-resonator coupling capacitance conductor layer 33c on the left half in plan view faces the fourth and sixth stripline conductor layers 16 and 18, and the fourth half inter-resonator coupling capacitance conductor layer on the right half. 33d faces the fifth and sixth stripline conductor layers 17 and 18. The first and second inter-cavity coupling capacitance conductor layers 33
It is possible to form a and 33b continuously and integrally, and continuously and integrally form the third and fourth inter-cavity coupling capacitance conductor layers 33c and 33d. In FIG. 8, the first, second, third, ninth and tenth dielectric layers 2a, 2
b, 2c, 2i, 2j and the conductor layers provided therein are configured the same as those denoted by the same reference numerals in FIG.

The equivalent circuit of the laminated dielectric filter of FIG. 8 is substantially the same as the equivalent circuit of FIG. 8 is different from FIG. 4 in that the capacitor C7 between the first, second and third stripline resonators L1, L2 and L3 is
That is, the bond by C8 was strengthened. FIG. 9 shows a first stripline resonator L1 composed of the first and fourth stripline conductor layers 13 and 16 and a third stripline resonator composed of the third and sixth stripline conductor layers 15 and 18 of FIG. The bonding state with L3 is shown in detail.
The capacitor C7a in FIG. 9 corresponds to the capacitance of the portions of the conductor layer 33a facing the first and fourth stripline conductor layers 13 and 16, and the capacitor C7b is the third and sixth stripline conductor layers of the conductor layer 33a. Capacitor C7c corresponds to the capacitance of the portion of the conductor layer 33c facing the fourth stripline conductor layer 16, and capacitor C7d corresponds to the sixth stripline of the conductor layer 33d. The inductances L33a and L33c correspond to the capacitances of the portions facing the conductor layer 18 and are defined by the conductor layers 33a and 3
It corresponds to the inductance of 3c. The second and third
The stripline resonators L2 and L3 are also coupled in the same manner as in FIG.

In FIG. 9, the inductances L33a, L33
Since c is connected in parallel with each other, the combined inductance value is 1/2 of the values of the inductances L33a and L33c.
become. Therefore, in comparison with the case of one inter-cavity coupling capacitance conductor layer 33 shown in FIG.
/ 2, and the capacitance increases by the conductor layers 33c and 33d. Between the resonators L1 and L3, C7a in FIG.
It becomes a parallel resonance circuit of the circuit of C7b, C7c, C7d, L33a and L33c and the inductance of the M coupling, which causes high frequency spurious resonance. In the filter of FIG. 4, a peak of spurious resonance occurs at about 4.8 GHz as shown by the broken line in FIG. 10, but in the filter of FIG. 8, the peak of spurious resonance shifts to about 6 GHz. Since the resonance frequency f0 of the fundamental wave is about 1.5 GHz, the filter of FIG. 8 causes the spurious resonance frequency to be significantly different from the fundamental resonance frequency, thereby reducing the interference.

[0021]

[Third Embodiment] Next, a third embodiment will be described with reference to FIG. However, in FIG. 11, parts that are substantially the same as those in FIG. 4 are given the same reference numerals, and descriptions thereof are omitted. In the laminated dielectric filter of FIG. 11, the fourth and fifth wavelength shortening capacitive conductor layers 30a and 31 are provided on the surface of the seventh dielectric layer 2g.
The structure is substantially the same as that of FIG. 4 except that a is added. In plan view, the fourth and fifth wavelength shortening capacitance conductor layers 30a and 31a are the stripline conductor layers 16 and 1, respectively.
9 and 17 and 20, one end of which is connected to the ground terminal conductor layer 6, acts in the same manner as the first and second capacitance conductor layers 30 and 31 for wavelength shortening, and further enhances the wavelength shortening effect. be able to.

[0022]

MODIFICATION The present invention is not limited to the above-mentioned embodiments, and the following modifications are possible. (1) In FIG. 2, the wavelength shortening capacitive conductor layers 30, 31, 3
The width of 2 is made smaller than the width of the stripline conductor layers 13 to 21 to prevent capacitance variation due to pattern displacement.
It can be wider than ~ 21. (2) It is also possible to omit the third stripline resonator L3 by the stripline conductor layers 15, 18 and 21 to form a two-stage filter. (3) A ground conductor layer can be provided on the first and second main surfaces 7 and 8. (4) In FIG. 2, the inter-resonator coupling capacitance conductor layer 33 is arranged so as not to overlap the input / output capacitance conductor layers 28 and 29 when viewed in plan, and mutual interference can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a laminated dielectric filter according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a fourth dielectric layer and a conductor layer below the fourth dielectric layer of the laminated dielectric filter of FIG.

3 is a cross-sectional view of the laminated dielectric filter of FIG.

FIG. 4 is an exploded perspective view of the multilayer dielectric filter of FIG.

5 is an equivalent circuit diagram of the filter of FIG.

FIG. 6 is an equivalent circuit diagram for explaining the wavelength shortening effect.

FIG. 7 is a diagram showing a relationship between a wavelength shortening capacitor and a resonance frequency.

FIG. 8 is an exploded perspective view of a laminated dielectric filter according to a second embodiment.

9 is an equivalent circuit diagram showing details of coupling of resonators in the filter of FIG.

10 is a frequency characteristic diagram of the filter of FIG.

FIG. 11 is an exploded perspective view showing a laminated dielectric filter of a third embodiment.

[Explanation of symbols]

2 dielectric 3, 4 I / O terminal conductor layer 5, 6 Ground terminal conductor layer 13 to 20 stripline conductor layer 28, 29 I / O capacitance conductor layer 30, 31, 32 Capacitive conductor layer for wavelength shortening

Claims (4)

[Claims] 1. A dielectric (2) comprising a plurality of dielectric layers and at least first and second stripline conductor layers (1) embedded in the dielectric (2) and arranged to face each other.
3, 16) and the first and second strip conductor layers (1
A multilayer dielectric filter comprising a strip line resonator (L1) composed of a ground conductor layer (22 or 25 or 22, 25) arranged opposite to each other, the first and second strips. Line conductor layer (13, 1
6) are arranged to face each other with a dielectric layer interposed therebetween, and the first and second stripline conductor layers (13, 1)
One end of 6) is electrically connected to the ground conductor layer (22), and the first and second stripline conductor layers (13, 1)
A laminated dielectric filter, wherein the other ends of 6) are not connected to each other and are separated by a dielectric layer. 2. The first stripline conductor layer (1)
The multilayer dielectric filter according to claim 1, wherein a conductor layer is disposed between the third stripline conductor layer (16) and the second stripline conductor layer (16) with a dielectric layer interposed therebetween. 3. The first and second ground conductor layers (22, 25), wherein the ground conductor layers are arranged to face each other.
And the first and second stripline conductor layers (13, 1).
6) is the first and second ground conductor layers (22, 2)
The laminated dielectric filter according to claim 1 or 2, wherein the laminated dielectric filter is arranged between 5). 4. The first stripline conductor layer (1)
The multilayer dielectric filter according to claim 1, 2 or 3, wherein the width (W ₁ ) of 3) is different from the width (W ₂ ) of the second stripline conductor layer (16).