JPH0897603A - Laminated dielectric filter - Google Patents

Abstract

PURPOSE: To obtain a laminated dielectric filter in which its filter characteristic is made stable. CONSTITUTION: The laminated dielectric filter is a filter formed by arranging a polarized conductor film 7, input/output conductor films 8a, 8b, 1st inner conductor films 21a, 21b, a 1st shield layer 3, 2nd inner conductor films 2a, 2b, and a 2nd shield layer 4 between respective plural sets of dielectric layers of a laminated dielectric board 1 sequentially from one major side of the board. The area of the input/output conductor films 8a, 8b is selected wider than a required opposite area to the polarized conductor film 7 and the 1st inner conductor films 21a, 21b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tri-plate type laminated dielectric filter suitable for surface mounting, and more particularly to a laminated type which can reduce variations in input / output capacitance and polarized capacitance and can obtain stable characteristics. The present invention relates to a dielectric filter.

[0002]

2. Description of the Related Art For example, as a bandpass filter used in a high frequency circuit of an electronic device or a communication device, a plurality of inner conductor films are formed on a dielectric filter or a laminated dielectric substrate in which block-shaped dielectric resonators are coupled to each other. A laminated dielectric filter having an interior and further having an outer conductor film arranged therein has been used.

In particular, the laminated dielectric filter has a chip shape and can be connected to a printed wiring board by a terminal electrode formed on an end surface of the laminated board.
This structure is suitable for surface mounting.

The laminated dielectric filter has a plurality of resonance means incorporated therein. For example, the inner conductor of the input resonance means is coupled to the input terminal electrode via the input capacitance. In addition, the inner conductor of the output resonance means is coupled to the output terminal electrode via the output capacitor. Further, the inner conductors of the respective resonance means are electromagnetically coupled to each other.

In such a laminated dielectric filter, in order to obtain desired filter characteristics, a polarized conductor film is used to prevent the input terminal electrode and the output terminal electrode from adjoining each other. The inner conductors were connected with a predetermined capacity.

FIG. 6 is an exploded view of a polarized multilayer dielectric filter having the simplest structure, and FIG. 7 is an exploded perspective view thereof.

In FIGS. 6 and 7, the laminated dielectric filter is arranged between the laminated dielectric substrate 1 composed of at least four dielectric layers 1a to 1d and the dielectric layers 1b and 1c. A plurality of strip-shaped inner conductor films 2a, 2b, a first shield layer 3a arranged between the dielectric layers 1a and 1b, and a second shield layer arranged between the dielectric layers 1c and 1d. Of the shield layer 4a, the plate-shaped polarized conductor film 7 on the dielectric layer 1a, and the terminal electrodes 6a, 6b, 9a, 9b formed on the end faces of the laminated dielectric substrate 1.

For example, the terminal electrodes 6a and 6b are opposed to each other 1
It is formed on the pair of substrate end faces and serves as an input / output terminal electrode, and is formed on the other pair of substrate end faces facing the terminal electrodes 9a and 9b to serve as a grounding terminal electrode.

The inner conductor films 2a and 2b are arranged at a predetermined interval between the dielectric layers 1b and 1c, and one end of the inner conductor film 2a extends near the terminal electrode 6a side.
The other end is connected to the grounding terminal electrode 9a. Further, one end of the internal conductor film 2b extends near the terminal electrode 6b side, and the other end is connected to the grounding terminal electrode 9b. That is,
Since the terminal electrodes 6a and 6b and the grounding terminal electrodes 9a and 9b are formed at positions orthogonal to each other, the internal conductor film 2
The shapes of a and 2b are L-shaped.

Further, the first and second shield layers 3, 4
Is a substantially plate-like shape that extends to the end surface of the laminated dielectric substrate 1 on which the terminal electrodes 9a and 9b are formed and does not extend to the end surface of the laminated dielectric substrate 1 on which the terminal electrodes 5a and 5b are formed,
As a result, the first and second shield layers 3 and 4 are electrically connected only to the terminal electrodes 9a and 9b.

Further, for example, between the dielectric layers 1a and 1b on which the first shield layer 3 is formed, the dielectric regions are formed by utilizing the blank regions of the first shield layer 3 and the terminal electrodes 6a and 6b. Input / output conductor films 8a and 8b that are capacitively coupled to one ends of the internal wirings 2a and 2b via the layer 1b are formed. The input / output conductor films 8a and 8b are connected to the terminal electrodes 6a and 6b.

In the laminated dielectric filter having the above structure, the first resonance means centering on the inner conductor 2a and the second resonance means centering on the inner conductor 2b are the inner conductor 2a.
And 2b are electromagnetically coupled. Also, the inner conductor 2
For example, one end of a is connected to the input conductor film 8 via the dielectric layer 1b.
A is opposed to a, and a predetermined capacitance due to this opposed is connected to the first resonance means like an input capacitance component Ci in the equivalent circuit shown in FIG. Further, one end of the internal conductor 2b faces the output conductor film 8b, for example, via the dielectric layer 1b, and the predetermined capacitance due to this facing is the second capacitance like the output capacitance component Cout in the equivalent circuit shown in FIG. Connected to the resonance means. Furthermore, both ends of the plate-shaped polarized conductor film 7 are formed on the dielectric layer 1a.
And the input / output conductor films 8a and 8b are coupled to each other via a predetermined capacitance. It should be noted that the predetermined capacities generated respectively are combined and become the polarized capacity Co in the equivalent circuit shown in FIG.

[0013]

However, in the above-mentioned laminated dielectric filter, if the arrangement positions of the input / output conductor films 8a and 8b formed between the dielectric layers 1a and 1b are deviated, The area of opposition to the conductor films 2a and 2b changes, and at the same time, the area of opposition to the polarized conductor film 7 also changes.

In such a state, it becomes impossible to control the desired filter characteristic, such as the attenuation pole, which is assumed to be the designed value.

Further, as the arrangement deviation which causes the fluctuation of the filter characteristic as described above, the lamination deviation when forming the laminated dielectric substrate 1, the polarized conductor film 7 and the input / output conductor film 8 are provided.
It is caused by a printing deviation when printing a and 8b is formed. Further, in addition to the capacitance generated in the area where the polarized conductor film 7 and the input / output conductor films 8a and 8b face each other, unnecessary wraparound occurs. The change in characteristics also occurs due to the capacitance generated by.

The present invention has been devised in view of the above-mentioned problems, and an object thereof is to suppress fluctuations in characteristics due to variations due to print formation deviations of input / output conductor films, stacking position deviations, and the like. A laminated dielectric filter will be provided.

[0017]

SUMMARY OF THE INVENTION The present invention has a plurality of dielectric layers to be laminated, a polarizable conductor film is disposed on the first dielectric layer, and the first dielectric layer and the first dielectric layer are laminated together. An input / output conductor film facing the polarized conductor film via the first dielectric layer is disposed between layers of the second dielectric layer, and between the second dielectric layer and the third dielectric layer. Two first inner conductor films facing the input / output conductor film via the second dielectric layer are arranged, and a first shield layer is provided between the third dielectric layer and the fourth dielectric layer. Place the 4th
Two second inner conductor films connected to the first inner conductor film are arranged between the dielectric layer and the fifth dielectric layer,
A dielectric layer formed by disposing a second shield layer between the dielectric layer and the sixth dielectric layer, wherein the input / output conductor film is a polarized conductor film and a first inner conductor. The laminated dielectric filter has an area larger than the area facing the film.

[0018]

In the multilayer dielectric filter according to the present invention, the input / output conductor film is interposed between the polarized conductor film and the conductor film on one end side of the inner conductor, and the shape of the input / output conductor film is The inner conductor is formed to have a size larger than a desired facing area of the inner conductor with the conductor film on one end side and a desired facing area of the polarized conductor film.

Therefore, even if the arrangement position of the input / output conductor film varies, or conversely, the arrangement position of the inner conductor film or the polarized conductor film facing the input / output conductor film also varies, for example, sufficiently. The input / output conductor film having a large area can absorb the variation.

Therefore, the capacitance particularly related to the input / output conductor film, that is, each capacitance component of the input / output capacitance and the polarized capacitance is stabilized, and desired filter characteristics can be easily obtained.

Further, in the present invention, regarding the inner conductor film,
Since the conductor film on one end side of the inner conductor facing the input / output conductor film and generating the input / output capacitance extends through the first shield layer to a portion not electrically related to the inner conductor film. In addition, stray capacitance other than input / output capacitance does not occur between the inner conductor and the input / output conductor film, and stable filter characteristics can be obtained.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The laminated dielectric filter of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an external perspective view of a laminated dielectric filter of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is BB in FIG. It is a figure which shows a line cross section, and FIG. 4 is an exploded perspective view.

The laminated dielectric filter of the embodiment will be described by using the laminated dielectric filter, which is the most basic structure and in which two resonance means are coupled.

The laminated dielectric filter of the present invention is arranged between the laminated dielectric substrate 1 having at least 6 layers, in the figure, 7 layers of dielectric layers 1a to 1g, and the dielectric layers 1a and 1b. Strip-shaped polarized conductor film 7 and the dielectric layer 1b
And the input / output conductor films 8a and 8b disposed between the layers 1c and 1c
And two first inner conductor films 21a and 21b arranged between the dielectric layers 1c and 1d, and the dielectric layer 1d.
A first shield layer 3 disposed almost entirely between the layers 1 and 1e, and two strip-shaped second inner conductor films 2a and 2b disposed between the dielectric layers 1e and 1f, It is composed of a second shield layer 4 which is disposed substantially on the entire surface between the dielectric layers 1f and 1g, and terminal electrodes 5a, 5b, 6a, 6b and 9 which are formed on the end faces of the laminated dielectric substrate 1. .
That is, the dielectric layer 1b corresponds to the first dielectric layer in the present invention, similarly, the dielectric layer 1c is the second dielectric layer, the dielectric layer 1d is the third dielectric layer, The dielectric layer 1e corresponds to the fourth dielectric layer, the dielectric layer 1f corresponds to the fifth dielectric layer, and the dielectric layer 1g corresponds to the sixth dielectric layer.

The dielectric layers 1a to 1g are made of a dielectric ceramic material containing barium titanate and alumina as main components and having a predetermined dielectric constant.

The second inner conductor films 2a and 2b are made of an Ag-based conductor, a Cu-based conductor, a conductor of a refractory metal material such as W or Mo, and are arranged between the dielectric layers 1e and 1f in parallel with each other. It is set up. The shape is such that it is bent and meandered, and both the second inner conductor films 2a and 2b are connected to each other. In addition, the second inner conductor films 2a and 2b
Are formed so as to extend to the front side edge of the laminated dielectric substrate 1, as shown in FIG.

Further, the first inner conductor films 21a, 21b
Are made of Ag-based conductors, Cu-based conductors, conductors made of refractory metal materials such as W and Mo, and are arranged in parallel with each other between the dielectric layers 1c and 1d. It is extended to the front side edge of the laminated dielectric substrate 1 shown in FIG. 4 so as to overlap the internal conductor films 2a and 2b.

The first shield layer 3 and the second shield layer 4 are made of an Ag-based conductor, a Cu-based conductor, a conductor made of a refractory metal material such as W or Mo, and the like.
Is between the dielectric layers 1d and 1e, and the second shield layer 4 is between the dielectric layers 1f and 1g.
It is formed so as to spread over substantially the entire surface of d, 1e, 1f, and 1g. The first and second shield layers 3 and 4 are
For example, the front side edges (second internal conductor films 2a and 2b, first internal conductor film 21) of the laminated dielectric substrate 1 shown in FIG.
a, 21b without extending to the edge side)
On the contrary, it is formed so as to extend to the end side opposite to the end side.

The input / output conductor films 8a and 8b are made of a Ag-based conductor, a Cu-based conductor, a conductor of a refractory metal material such as W or Mo, and are arranged between the dielectric layers 1b and 1c. There is. The input / output conductor films 8a and 8b are independently formed on the left and right edges of the laminated dielectric substrate 1 shown in FIG.
It is composed of extending portions 82a and 82b extending from 81b to the left and right side edges of the laminated dielectric substrate 1, respectively.

The polarized conductor 7 is composed of an Ag-based conductor, a Cu-based conductor, a conductor of high melting point gold such as W or Mo, and is arranged between the dielectric layers 1a and 1b.

The polarized conductor 7 is formed so as to extend at least in the left-right direction of the laminated dielectric substrate 1 shown in FIG.

Next, the terminals formed on the laminated dielectric substrate 1 will be described. Terminal electrodes 5a, 5b, 6a, 6b, 9
Are formed by plating the conductor films of Ag and Cu, respectively, and the surface thereof, if necessary. The conductor film is
For example, it is formed by forming a conductor coating film by end face printing of a paste of Ag or Cu, selective application, selective dip adhesion, and the like, followed by baking treatment.

The terminal electrodes 5a and 5b are formed on the front end surface of the laminated dielectric substrate 1 shown in FIG.
It is formed so as to cover the extended end portion of 2b and the extended end portions of the first internal conductor films 21a and 21b. This allows
The second inner conductor films 2a and 2b and the first inner conductor film 21
a and 21b are connected to each other and act as inner conductors.

The terminal electrodes 6a and 6b are formed on the left and right end surfaces of the laminated dielectric substrate 1 shown in FIG. 4 so as to cover the extended end portions of the output conductor films 8a and 8b. Thereby, for example, the input conductor film 8a is connected to the terminal electrode 6a, the terminal electrode 6a acts as an input side terminal, and, for example, the output conductor film 8b is connected to the terminal electrode 6b. The terminal electrode 6b acts as an output side terminal.

The terminal electrode 9 is formed on the end surface of the laminated dielectric substrate 1 shown in FIG. 4 on the depth side so as to cover the extended end portions of the first shield layer 3 and the second shield layer 4. It is formed almost all over the side. As a result, the first shield layer 3 and the second shield layer 4 are connected to each other by the terminal electrode 9, and the terminal electrode 9 acts as a ground potential terminal electrode.

Next, the capacitance component will be described.
A part of the internal conductor film 21a of
For example, a predetermined capacitance is generated which faces the input conductor film 8a and is determined by the facing area, the distance between the facings, and the dielectric constant of the dielectric layer 1c. This capacitance becomes the input capacitance Cin shown in the equivalent circuit of FIG. In addition, a part of the first inner conductor film 2b is
For example, a predetermined capacitance that faces the output conductor film 8b via the dielectric layer 1c and that is determined by the facing area, the distance between the facings, and the dielectric constant of the dielectric layer 1c is generated. This capacity is
The output capacitance Cout shown in the equivalent circuit of

Both ends of the polarized conductor film 7 are arranged so as to face the input / output conductor films 8a and 8b, and a part of the polarized conductor film 7 (the right end portion) is For example, a predetermined capacitance that faces the input conductor film 8a via the dielectric layer 1b and that is determined by the facing area, the facing distance, and the dielectric constant of the dielectric layer 1c is generated. Further, a part (the left end portion) of the polarized conductor film 7 faces, for example, the output conductor film 8b via the dielectric layer 1b, and the facing area, the facing distance, and the dielectric layer 1c dielectric. A certain capacity is generated which is determined by the rate. Both capacitance components are combined to form a polarized capacitance Co that directly capacitively couples the input / output terminals 6a and 6b as shown in the equivalent circuit of FIG.

As a result, as shown in the equivalent circuit diagram of FIG. 5, the second inner conductor films 2a and 2b and the first inner conductor film 2 are formed.
A first resonance means for electromagnetically coupling each other with an inner conductor composed of 1a and 21b and a capacitance component generated between the inner conductor and the first shield layer 3 and the second shield layer 4, 2 resonance means (illustrated by the LC parallel resonance circuit in the figure) are obtained. Further, the first and second resonance means and the input / output terminal electrodes 6a and 6b are capacitively coupled by the input capacitance Cin and the output capacitance Cout. At the same time, the input terminal electrode 6a and the output terminal electrode 6b are capacitively coupled by the combined polarized capacitance Co.

In the case of controlling the actual filter characteristics, particularly the attenuation pole near an arbitrary frequency, it can be performed by setting the polarization capacity Co to a predetermined value.

In such a laminated dielectric filter, for example, a dielectric green sheet to be each of the dielectric layers 1a to 1g is used, and a coating film to be a predetermined conductor film is formed on the green sheet by Ag, Cu. Low resistance conductor, high melting point gold conductor paste such as W and Mo is formed by printing and drying, and the dielectric green sheets on which this coating film is formed are laminated and integrated according to the order of lamination, and as necessary. To form a dividing groove,
After cutting or the like, it is formed by integrally firing.

After that, if necessary, the shape of the final laminated dielectric filter is subjected to a division treatment or the like, and the terminal electrode 5 is formed.
Conductor films to be a, 5b, 6a, 6b and 9 are applied / baked and, if necessary, plated.

By the way, in the above-mentioned manufacturing process, the coating film which becomes the polarized conductor film 7 is formed by printing the conductive paste on the dielectric green sheet which becomes the dielectric layer 1b, and the dielectric layer is also formed. A coating film to be the input / output conductor films 8a and 8b is formed on the dielectric green sheet to be 1c by printing a conductive paste, and a first inner conductor film is to be formed on the dielectric green sheet to be the dielectric layer 1d. 21a, 21b
A coating film that becomes is formed by printing a conductive paste.
Further, similarly, on the green sheets that become the dielectrics 1e to 1g, the conductor film that becomes the first shield layer 3, the conductor film that becomes the second inner conductor films 2a and 2b, and the conductor film that becomes the second shield layer 4 are formed respectively. Is formed, these dielectric green sheets are laminated, and thereafter, a firing process is performed integrally.

In particular, as described above, the filter characteristic is
The capacitance component generated in each conductor film that faces each other through the dielectric layer including the polarized capacitor is extremely important. In the above-described manufacturing method, the coated film that becomes the polarized conductor film 7 is particularly important. For example, due to printing misalignment of the conductive paste in forming the coating film to be the input / output conductor films 8a and 8b and the coating film to be the first internal conductor films 21a and 21b, and to the stacking position shift during stacking, The facing area between the polarized conductor film 7 and the input / output conductor films 8a and 8b and the facing area between the input / output conductor films 8a and 8b and the first inner conductor films 21a and 21b may vary.

Therefore, according to the present invention, the input / output conductor film for generating the polarized capacitance and the input / output capacitance is composed of the polarized conductor film 7 and the inner conductor (first inner conductor films 21a, 21b). In addition, the shape of the input / output conductor films 8a and 8b is set so as to have a desired opposing area with the polarized conductor film 7 and the first inner conductor film 21.
The area was set so as to be wide enough to include the desired facing area with a and 21b.

The actual control of the facing area is performed by the shape (length, width) of both ends of the polarized conductor film 7 and the shape (length) of the end portions of the first inner conductor films 21a and 21b. , Width), the capacitance generating portion 81 of the input / output conductor films 8a and 8b is considered.
It is performed by setting a and 81b to a predetermined shape (length, width).

In this way, the first inner conductor film 21 is formed.
a, 21b, polarized conductor film 7, input / output conductor films 8a, 8b
Even if printing misalignment, stacking position misalignment, etc. occur during the formation of the film, the misalignment can be effectively absorbed by the large-sized portions of the input / output conductor films 8a, 8b, and the fluctuation of the polarized capacity Co Thus, it is possible to simultaneously suppress the fluctuations of the input / output capacitances Cin and Cout, simplify the manufacturing process, and achieve a laminated dielectric filter with stable characteristics.

As a result of various studies by the present inventor, in order to further stabilize the filter characteristics, the input / output conductor film 8
The shapes of a and 8b (capacity generating portions 81a and 81b) are, for example, a value αμm (for example, 50 μm) in consideration of a print deviation and a stacking deviation around the expected facing area of the polarized conductor film 7.
.mu.m) is added to about 100 .mu.m to set a wide value of about 150 .mu.m. In addition, for example, the first inner conductor films 21a and 21b
100 μ in the value αμm (eg 50 μm) that is the amount of light for printing misalignment and stacking misalignment with respect to the expected facing area.
It is set to be about 150 μm wide by adding about m, and the larger of both set values is actually used.

This will be explained with reference to the polarized conductor film 7 side.
The actual capacitance is determined by the polarized conductor film 7 and the input / output conductor films 8a, 8
In addition to the facing area corresponding to the projected area with b, the sneak capacitance is generated in the widened portions of the polarized conductor film 7 and the input / output conductor films 8a and 8b. This sneak capacitance varies slightly depending on the thickness of the dielectric layer 1b, but is generated in a range of about 100 μm around the actual facing area.

Therefore, by making the shape of the input / output conductor films 8a, 8b wider by 100 μm than the expected opposing area to an α value (50 μm) assuming printing deviation and stacking deviation, the wraparound capacitance is increased. Even if it occurs, the sneak capacity can be taken in, and it can be used as the capacity due to the opposite.
It is possible to effectively suppress the characteristic variation due to the sneaking capacity.

As an actual example, a predetermined facing area facing the input conductor film 8a on one end side of the polarized conductor film 7 is 200 μm.
If m × 200 μm, the actual size of the input conductor film 8a is a value α (for example, 5) which is assumed to be misalignment in printing and misalignment.
0) μm is added with 100 μm capable of absorbing the wraparound capacity to make it 500 μm × 500 μm or more. The same applies to the first inner conductor film 21a and the input conductor film 8a, and it is necessary to compare the two values and use a wider value.

Further, in the present invention, the one end side conductors 21a and 21b of the inner conductor for mainly generating the input / output capacitances Cin and Cout are the second inner conductor films 2a and 2b and the first shield layer 3 respectively. It is partitioned by. That is, the first
The one main surface side of the shield layer 3 of the
1a and 21b, input / output conductor films 8a and 8b, and a polarized conductor film 7 are arranged. Therefore, the first shield layer 3
The conductor films 21a, 21b, 8a, 8b, 7 disposed on the one main surface side for generating the capacitors do not affect the second internal conductor films 2a, 2b in terms of capacitance. Since it is configured as described above, the filter characteristic can be stabilized also for this reason.

In the above embodiments, the laminated dielectric filter having two inner conductor films has been described. However, for example, three or more inner conductor films may be incorporated in the laminated dielectric substrate. Further, between the first shield layer 3 and the second shield layer 4, the second inner conductor films 2a and 2b sandwiched between the dielectric layer 1e and the dielectric layer 1f are arranged. Further, an intermediate conductor for increasing the electrical length of the inner conductor that connects the dielectric layer to the inner conductor film (the longer the electrical length, the shorter the actual length of the inner conductor film) may be formed in the meantime. Absent.

Further, in the above-described embodiment, the connection between the second inner conductor films 2a and 2b and the first inner conductor films 21a and 21b is performed by the terminal electrode 5 formed on the end face of the laminated dielectric substrate 1.
a and 5b, this terminal electrode 5a,
Instead of 5b, via hole conductors penetrating at least the laminated layers 1e and 1d may be used for connection.

[0055]

As described above, according to the present invention, stable filter characteristics are derived even if the polarized conductor film including the input / output conductor film and the first inner conductor film are misaligned due to printing or stacking. The laminated dielectric filter can be manufactured and is relatively easy to manufacture.

[Brief description of drawings]

FIG. 1 is an external perspective view of a laminated dielectric filter of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1 of the laminated dielectric filter of the present invention.
It is a figure which shows a line cross section.

FIG. 3 is a BB in FIG. 1 of the laminated dielectric filter of the present invention.
It is a figure which shows a line cross section.

FIG. 4 is an exploded perspective view of a laminated dielectric substrate of the laminated dielectric filter of the present invention.

FIG. 5 is an equivalent circuit diagram of the laminated dielectric filter of the present invention.

FIG. 6 is an external perspective view of a conventional laminated dielectric filter.

FIG. 7 is an exploded perspective view of a conventional laminated dielectric filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Multilayer dielectric substrate 2a, 2b ... 2nd internal conductor film 21a, 21b * 1st internal conductor film 3 ... 1st shield layer 4 ... 2nd shield layer 5a, 5b ... ・ Terminal electrodes 6a, 6b ... I / O terminal electrodes 9 ... Earth terminal electrodes 7 ... Polarized conductor films 8a, 8b ... I / O conductor films

Claims (1)

[Claims] 1. A plurality of dielectric layers are laminated, a polarized conductor film is disposed on the first dielectric layer, and the polarized conductor film is disposed between the first dielectric layer and the second dielectric layer. An input / output conductor film is arranged to face the polarized conductor film via the first dielectric layer, and the second dielectric layer is interposed between the second dielectric layer and the third dielectric layer. Two first inner conductor films facing the input / output conductor film, and a first shield layer between the third dielectric layer and the fourth dielectric layer. A second inner conductor film connected to the first inner conductor film is disposed between the fifth dielectric layer and the fifth dielectric layer, and a second inner conductor film is disposed between the fifth dielectric layer and the sixth dielectric layer. A laminated dielectric filter having a shield layer arranged, wherein the input / output conductor film has a larger area than an area where the polarized conductor film and the first inner conductor film face each other. Layer dielectric filter.