JP2003258505A - Dielectric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dielectric apparatus suitable for downsizing the dielectric block while keeping the shape of a rectangular solid and capable of providing a notch filter function to the dielectric block. <P>SOLUTION: Holes 41 to 43 are formed to a dielectric block 1, one end of the holes is open to an outer face 21 of the dielectric block 1, each hole extends toward an outer face 22 opposed to the outer face 21, and inner conductor films 61 to 63 continuous to an outer conductor film 3 are adhered to the inner face of the holes. Terminal electrode films 11, 12 are adhered to the outer face 23 of the dielectric block 1 independently of the outer conductor film 3 and electrically coupled to the inner conductor films 61 to 63 via a layer of the dielectric block 1. A conductor film strip 5 is formed to the outer face of the dielectric block 1 with a gap from the terminal electrode film 12 and is opposed to the terminal electrode film 12 via the gap. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric device such as a dielectric resonator, a dielectric filter or a duplexer.

[0002]

2. Description of the Related Art A dielectric device of this type is used in a quasi-microwave band, a microwave band, or higher frequency region. More specific application examples include satellite communication devices, mobile communication devices, wireless communication devices, high-frequency communication devices, and base stations for these communication devices.

As a dielectric device of this type, conventionally,
A block type in which a plurality of through holes are provided in a rectangular parallelepiped dielectric block is known. For example, when configuring a high frequency band filter using a block type dielectric device, when it is necessary to obtain an attenuation pole in the high frequency region near or outside the band, conventionally, a dielectric notch filter is used. A body resonator is added, or another line of transmission line for a notch filter is attached to the dielectric block.

However, in the block type dielectric device,
Aside from this, the configuration in which the dielectric resonator forming the notch filter is added cannot meet the demands for downsizing and cost reduction.

Further, in the case of the structure in which the notch filter resonance part is attached to the dielectric block, the notch filter resonance part which does not require so high Q is compared with the resonance part forming the pass filter. Inevitably, it is formed on the same dielectric block as that of the resonance part, which causes an increase in size and cost of the dielectric device. Moreover,
When the attenuation pole is at a frequency considerably higher than the pass frequency band, the length of the notch filter resonance part becomes shorter than the length of the resonance part that constitutes the pass band filter. The structure is required, and the molding or processing of the dielectric block becomes complicated, and the cost tends to increase.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a dielectric device capable of imparting a notch filter function while keeping the dielectric block in a substantially rectangular parallelepiped shape which can be easily molded. .

Another object of the present invention is to provide a dielectric device suitable for miniaturization.

[0008]

In order to solve the above problems, a dielectric device according to the present invention comprises a dielectric block,
It includes at least one hole, a terminal electrode, and a strip conductor.

The dielectric block is a substantially rectangular parallelepiped,
The outer surface is covered with an outer conductor. The hole is provided in the dielectric block, one end of the hole is opened to one of the outer surfaces of the dielectric block, extends toward the other outer surface facing the one outer surface, and is continuous with the outer conductor on the inner surface. An inner conductor is provided.

The terminal electrode is provided on the outer surface of the dielectric block independently of the outer conductor, and is electrically coupled to the inner conductor via a layer of the dielectric block.

The strip-shaped conductor is provided on the outer surface of the dielectric block with a gap from the terminal electrode and faces the terminal electrode through the gap.

As described above, in the dielectric device according to the present invention, since the dielectric block is a substantially rectangular parallelepiped, it is easy to mold.

The outer surface of the dielectric block is covered with an outer conductor. A hole is provided in the dielectric block, one end of which opens into one of the outer surfaces of the dielectric block, extends toward the other outer surface opposite one of the outer surfaces, and has an inner conductor continuous with the outer conductor on the inner surface. ing. Therefore, a block type dielectric device having a resonance part corresponding to the number of holes, specifically, a dielectric device such as a dielectric resonator, a dielectric filter, or a duplexer can be obtained.

The dielectric device according to the present invention includes a terminal electrode, the terminal electrode being provided on the outer surface of the dielectric block independently of the outer conductor, and electrically connected to the inner conductor via the dielectric block. Is bound to. Therefore, the terminal electrode can be used as an input terminal or an output terminal that is capacitively coupled to the resonance portion.

The dielectric device according to the present invention includes a strip conductor as its structural characteristic portion. The strip-shaped conductor is provided on the outer surface of the dielectric block with a gap from the terminal electrode, and faces the terminal electrode through the gap. According to this structure, a capacitance is generated by the gap formed between the terminal electrode used as the input terminal or the output terminal and the strip conductor, and the inductance component of the strip conductor causes the LC series resonance circuit to be connected to the terminal electrode. Can be added. By properly setting the resonance characteristics of the LC series resonance circuit, it is possible to provide an attenuation pole near or outside the pass band and function as a notch filter.

Moreover, in obtaining the attenuation pole, a simple structure in which a band-shaped conductor is added is all that is required, so that the overall shape can be made smaller than in the prior art using a resonator having a through hole or the like.

The device according to the present invention can be used as a device that widely covers a resonator, an oscillator, a dielectric filter or a Duplexer (also called a duplexer or an antenna duplexer). Of these, when used as a resonator,
Sometimes one resonance part is enough. When used in a dielectric filter or a duplexer, there are a plurality of resonance parts.

The dielectric device according to the present invention can take various concrete modes according to the above-mentioned applications. The example is as follows. (A) The strip conductor may be continuous with the outer conductor or may be independent of the outer conductor. (B) The number of strip conductors may be only one or may be plural. Even if there is only one strip-shaped conductor, it is possible to take a pattern branched into a plurality of strips. (C) Generally, there are a plurality of holes and a plurality of resonance parts corresponding to the number of holes. The terminal electrodes are also generally two for input and for output. (D) The dielectric block may have a groove on the outer surface. In this case, the strip conductor may be formed inside the groove. (E) The dielectric block may have a convex portion on the outer surface. In this case, the strip conductor can be formed on the surface of the convex portion. (F) The strip conductor may be a straight path or a curved path. (G) The strip-shaped conductor may extend over the other outer surface as long as it is provided at least on the surface adjacent to the surface on which the hole is opened, or may be provided on only one outer surface. (H) The terminal electrode may be provided so as to straddle the outer surface adjacent to the dielectric block, or may be provided only on one outer surface. The outer surface of the terminal electrode to be formed may be the side surface of the dielectric block or the surface where the hole is opened. (I) The open end of the resonance part may be the inner surface of the hole,
It may be at the end. Further, a conductor continuous with the inner conductor may be formed on the outer surface to form an open end.

Other objects, structures and advantages of the present invention will be described in more detail with reference to the accompanying drawings. However,
It goes without saying that the technical scope of the present invention is not limited to these illustrated embodiments.

[0020]

1 is a perspective view of a dielectric filter according to the present invention, and FIG. 2 is a sectional view taken along line 2-2 of FIG. The illustrated dielectric filter is a dielectric block 1
And the first to third resonance parts Q1 to Q3, the first and second terminal electrodes 11 and 12, and the strip conductor 5.

The dielectric block 1 is made of a known dielectric ceramic and is provided in a substantially rectangular parallelepiped shape having outer surfaces 21 to 26. Therefore, its molding is easy.

The dielectric block 1, except for the outer surface 21,
Most of the outer surfaces 22 to 26 are covered with the outer conductor 3. The outer conductor 3 generally contains copper or silver as a main component,
It is a metallized film provided by means such as baking or plating.

The first to third resonating parts Q1 to Q3 are sequentially coupled to each other to form a resonating part which defines a pass band. The number is arbitrary and is not limited to the three shown.

The first resonating portion Q1 includes a first hole 41. The first hole 41 is provided in the dielectric block 1, has one end opening to the outer surface 21, and extends from the outer surface 21 toward the outer surface 22 that is the opposite surface thereof. In the illustrated embodiment, the first hole 41 is a through hole.

The first hole 41 has a first inner conductor 61 inside. The first inner conductor 61 is continuous with the first coupling conductor 611 provided on the outer surface 21 of the dielectric block 1. The first coupling conductor 611 is independent of the outer conductor 3.

The second resonating portion Q2 includes a second hole 42. The second hole 42 is provided in the dielectric block 1, has one end opening to the outer surface 21, and extends from the outer surface 21 toward the outer surface 22, which is the opposite surface thereof. The second hole 42 of the embodiment is a through hole.

The second hole 42 has a second inner conductor 62 inside. The second inner conductor 62 is continuous with the second coupling conductor 621 provided on the outer surface 21 of the dielectric block 1. The second coupling conductor 621 is independent of the outer conductor 3 and is juxtaposed with the first coupling conductor 611 via the gap G11 (see FIG. 2).

The third resonating portion Q3 includes a third hole 43. The third hole 43 is provided in the dielectric block 1, has one end opening to the outer surface 21, and extends from the outer surface 21 toward the outer surface 22, which is the opposite surface thereof. The third hole 43 is also a through hole.

The third hole 43 has a third inner conductor 63 inside. The third inner conductor 63 is continuous with the third coupling conductor 631 provided on the outer surface 21 of the dielectric block 1. The third coupling conductor 631 is independent of the outer conductor 3 and is juxtaposed with the second coupling conductor 621 via the gap G12 (see FIG. 2).

In the illustrated embodiment, the first to third inner conductors 61
To 63 are provided as metallized films by the same material and means as the outer conductor 3. Unlike this, first to
The third inner conductors 61 to 63 may be filled so as to fill a part or the whole of each hole. The first to third strip conductors 611 to 631 are also metallized films.

The first to third holes 4 shown in the embodiment are also provided.
1 to 43 are through holes, but may be non-through holes (bottomed holes) that stop in the middle. Further, instead of opening to the outer surface 22, a hole that is bent in the lateral direction on the way from the outer surface 21 to the outer surface 22 and opens to the outer surfaces 23 to 25 may be used.

The first terminal electrode 11 is provided on the outer surface 23 of the dielectric block 1 independently of the outer conductor 3, and is electrically coupled to the first inner conductor 61 via the dielectric block 1. ing. A gap G2 exposing the surface 23 of the dielectric block 1 between the first terminal electrode 11 and the outer conductor 3.
1 and the first terminal electrode 11 is independent of the outer conductor 3 by this gap G21. First terminal electrode 11
Is provided across the outer surface 23 and the outer surface 21, and the outer surface 2
On the top of No. 1, capacitive coupling with the first coupling conductor 611 is made via the gap G31 (see FIG. 2).

The second terminal electrode 12 is provided on the outer surface 23 of the dielectric block 1 independently of the outer conductor 3 and electrically connected to the third inner conductor 63 via the layer of the dielectric block 1. Are combined. A gap G is formed between the second terminal electrode 12 and the outer conductor 3 so that the surface 23 of the dielectric block 1 is exposed.
22 and the second terminal electrode 12 has a gap G22.
Is independent of the outer conductor 3. Second terminal electrode 1
2 is provided so as to extend from the outer surface 23 to the outer surface 21, and on the outer surface 21 via the gap G32 (see FIG. 2), the third
Capacitive coupling with the coupling conductor 631.

The first and second terminal electrodes 11 and 12 are used as input terminals or output terminals. For simplification of description, it is assumed that the first terminal electrode 11 is used as an input terminal and the terminal electrode 12 is used as an output terminal.

The strip conductor 5 is formed on the outer surface 2 of the dielectric block 1.
1 is provided side by side with the gap G41 (see FIG. 2) from the second terminal electrode 12 and faces the second terminal electrode 12 via the gap G41. More specifically, in the strip conductor 5, the coupling portion 51 faces the extension portion 121 of the second terminal electrode 12 via the gap G41 and extends in a strip shape.

The strip-shaped conductor 5 includes a strip-shaped portion 52 extending from the middle of a coupling portion 51 provided on the outer surface 21, and the strip-shaped portion 52 extends from the outer surface 25 of the dielectric block 1 toward the outer surface 22. It extends and is continuous with the outer conductor 3 at the position of the outer surface 22.

As described above, the dielectric filter shown in FIGS. 1 and 2 includes the dielectric block 1 and the first to third parts.
And holes 41 to 43. 1st-3rd hole 41-
43 is provided in the dielectric block 1, one end of which is opened to the outer surface 21 of the dielectric block 1, extends toward the outer surface 22 facing the outer surface 21, and is continuous with the outer conductor 3 on the inner surface.
Third inner conductors 61 to 63 are provided. Therefore,
Resonant parts Q1 to Q corresponding to the number of holes (three in the case shown)
Block type dielectric device having 3, specifically,
A dielectric filter is obtained.

The dielectric filter shown in the embodiment includes the first and second terminal electrodes 11 and 12, and the first and second terminal electrodes 11 and 12, respectively.
The terminal electrodes 11 and 12 are provided on the outer surfaces 21 and 23 of the dielectric block 1 independently of the outer conductor 3, and are electrically coupled to the inner conductor via the layers of the dielectric block 1. Therefore, the first terminal electrode 11 is used as an input terminal for capacitively coupling to the resonance part Q1, and the second terminal electrode 12 is
It can be used as an output terminal that is capacitively coupled to the resonance part Q3.

The dielectric filter of the illustrated embodiment includes a strip conductor 5 as its structural characteristic portion. The strip-shaped conductor 5 is provided on the outer surface 21 of the dielectric block 1 with the gap G41 from the second terminal electrode 12, and the joint portion 51 extends the second terminal electrode 12 through the gap G41. It faces the part 121. According to this structure, the second terminal electrode 12 used as an output terminal,
Gap G41 generated between the band-shaped conductor 5 and the coupling portion 51
In addition to generating capacitance, the LC series resonance circuit can be added to the second terminal electrode 12 mainly by the inductance component of the strip portion 52 of the strip conductor 5. By properly setting the resonance characteristics of this LC series resonance circuit, it is possible to give an attenuation pole to the frequency outside the pass band and function as a notch filter.

In the case of the embodiment, the strip conductor 5 includes a strip portion 52 extending from the coupling portion 51 provided on the outer surface 21, and the strip portion 52 covers the outer surface 25 of the dielectric block 1 and the outer surface 21 to the outer surface 22. Direction and is continuous with the outer conductor 3 at the position of the outer surface 22, the LC series resonance circuit is provided between the second terminal electrode 12 and the outer conductor 3 to be grounded. As a result, an attenuation pole is generated at a frequency outside the pass band, and it functions as a notch filter.

Moreover, in obtaining the attenuation pole, a simple structure in which the strip-shaped conductor 5 is added is sufficient, and therefore the overall shape can be made smaller than in the prior art using a resonator having a through hole or the like.

FIG. 3 shows a bandpass filter characteristic L11 and an insertion loss characteristic L21 of the dielectric filter according to the embodiment shown in FIGS. In the figure, the horizontal axis indicates frequency (MH
z), the left vertical axis represents the attenuation amount (dB) for the bandpass filter characteristic L11, and the right vertical axis represents the insertion loss characteristic L2.
The insertion loss (dB) for 1 is taken.

The data shown in FIG. 3 shows that in the embodiment shown in FIGS. 1 and 2, the dielectric block 1 has a relative permittivity εr = 37.
The dielectric material was used to form a substantially rectangular parallelepiped shape. The shape of the dielectric block 1 is such that the plane area of the outer surface 21 is (8.2 m
m × 2.5 mm), and the size of the holes 41 to 43 viewed in the longitudinal direction was 9.8 mm.

Referring to FIG. 3, 1870 out of the pass band
The attenuation pole NCH is generated in the vicinity of MHz, so that it can function as a notch filter.

The dielectric device according to the present invention can take various forms. Next, a specific example thereof will be described with reference to the drawings. In the drawings shown below, the same components as those shown in the previous drawings are designated by the same reference numerals, and a duplicate description will be omitted.

FIG. 4 is a perspective view showing another embodiment of the dielectric filter according to the present invention. In the embodiment shown in FIG.
The strip conductor 5 has a meandering strip portion 52. Band 52
On the outer surface 25 of the dielectric block 1, the wire extends in a meandering direction from the outer surface 21 to the outer surface 22 and is continuous with the outer conductor 3 at the position of the outer surface 22.

FIG. 5 is a perspective view showing still another embodiment of the dielectric filter. In the embodiment shown in FIG. 5, the strip-shaped conductor 5 has a plurality (two) of strip-shaped portions 52 and 53 extending from the coupling portion 51 provided on the outer surface 21. Strips 52, 5
3 is an outer surface 21 of the outer surface 25 of the dielectric block 1.
From the outer conductor 22 to the outer surface 22 in a direction substantially parallel to each other, and the tip positions thereof end at a substantially intermediate position on the outer surface 25.
To be independent of.

FIG. 6 is a perspective view showing still another embodiment of the dielectric filter according to the present invention. The strip conductor 5 has an outer surface 2
It has a plurality of (two) strip-shaped portions 52 and 53 extending from the coupling portion 51 provided in 1. The strip portion 52 extends from the outer surface 21 toward the outer surface 22 on the outer surface 25 of the dielectric block 1 and is continuous with the outer conductor 3 at the position of the outer surface 22. The strip-shaped portion 53 is formed on the outer surface 25 of the dielectric block 1 by the outer surface 2
1 extends in the direction of the outer surface 22, its tip ends on the outer surface 25 and is spaced from the outer conductor 3.

FIG. 7 is a perspective view showing still another embodiment of the dielectric filter according to the present invention, and FIG. 8 is a sectional view taken along line 8-8 of FIG. In the embodiment shown in FIGS. 7 and 8, the dielectric block 1 has the concave groove 8 on the outer surface 25, and the band-shaped conductor 5 has the band-shaped portion 52 provided inside the concave groove 8. The strip portion 52 of the strip conductor 5 is continuous with the outer conductor 3 at the position of the outer surface 22.

FIG. 9 is a perspective view showing still another embodiment of the dielectric filter according to the present invention. In the embodiment shown in FIG. 9, the dielectric block 1 has the convex portion 9 on the outer surface 25, and the strip conductor 5 has the strip portion 52 provided on the surface of the convex portion 9. The strip portion 52 of the strip conductor 5 is continuous with the outer conductor 3 at the position of the outer surface 22.

FIG. 10 is a perspective view showing still another embodiment of the dielectric filter according to the present invention, and FIG. 11 is 11-1 of FIG.
It is sectional drawing which followed the 1 line. In the embodiment shown in FIGS. 10 and 11, the strip conductor 7 is provided in addition to the strip conductor 5. The strip-shaped conductor 7 is provided on the outer surface 21 of the dielectric block 1 with a gap G42 (see FIG. 11) from the first terminal electrode 11, and the strip-shaped portion 71 has the first terminal through the gap G42. It faces the extension portion 111 of the electrode 11. According to this structure, the first terminal used as the input terminal
The gap G42 formed between the terminal electrode 11 and the coupling portion 71 of the strip conductor 7 causes capacitance, and the inductance component of the strip portion 72 of the strip conductor 7 causes LC to be applied to the first terminal electrode 11. A series resonance circuit can be added.

In the case of the embodiment, the strip conductor 7 includes a strip portion 72 (see FIG. 11) extending from the strip portion 71 provided on the outer surface 21, and the strip portion 72 covers the outer surface 26 of the dielectric block 1. The outer surface 21 extends in the direction of the outer surface 22,
Since the LC series resonance circuit is continuous with the outer conductor 3 at the position 2, the LC series resonance circuit is provided between the first terminal electrode 11 and the outer conductor 3 to be grounded. Attenuation pole is generated at and functions as a notch filter. That is, two notch filters are added in the embodiment.

FIG. 12 is a perspective view showing still another embodiment of the dielectric filter according to the present invention. The strip conductor 5 has two strip portions 52 and 53 extending from the coupling portions 511 and 512 provided on the outer surface 21. The coupling portions 511 and 512 are provided at a distance from each other and commonly face the extension portion 121 of the second terminal electrode 12. The strip portion 52 is continuous with the coupling portion 511, extends from the outer surface 21 toward the outer surface 22 on the outer surface 25 of the dielectric block 1, and is continuous with the outer conductor 3 at the position of the outer surface 22. The strip-shaped portion 53 is continuous with the coupling portion 512, and is provided on the outer surface 25 of the dielectric block 1 with the coupling portion 511 spaced apart from each other.
Extending in the direction of, and is continuous with the strip-shaped extension 511 and the outer conductor 3.

In the case of this embodiment, the second terminal electrode 12
Between the extension 121 of the outer conductor 3 and the outer conductor 3, the LC series resonance circuit including the coupling portion 511 and the strip portion 52, and the coupling portion 5
An LC resonance circuit in which an LC series resonance circuit including 12 and the strip portion 53 is interposed in parallel is obtained.

FIG. 13 is a perspective view showing still another embodiment of the dielectric filter according to the present invention. The strip conductor 5 has two strip portions 52 and 53 extending from the coupling portions 511 and 512 provided on the outer surface 21. The coupling portions 511 and 512 are provided at a distance from each other and commonly face the extension portion 121 of the second terminal electrode 12. The strip portion 52 is continuous with the coupling portion 511, extends from the outer surface 21 toward the outer surface 22 on the outer surface 25 of the dielectric block 1, and is continuous with the outer conductor 3 at the position of the outer surface 22.

The band-shaped portion 53 is continuous with the joint portion 512 and is provided on the outer surface 25 of the dielectric block 1 with a gap from the joint portion 511, extends in the direction from the outer surface 21 to the outer surface 22, and has a tip on the outer surface 25. Ends almost in the middle.

FIG. 14 is a perspective view showing still another embodiment of the dielectric filter according to the present invention. In this embodiment, between the first coupling conductor 611 forming the first resonating portion Q1 and the second coupling conductor 621 forming the second resonating portion Q2, and the second resonating portion Q2 are Between the second coupling conductor 621 that constitutes the third coupling conductor 631 and the third coupling conductor 631 that constitutes the third resonance part Q3, the coupling adjustment strip conductor 31,
32 is provided. The coupling adjusting strip conductors 31 and 32 are continuous with the outer conductor 3.

The strip conductor 5 has a meandering strip portion 52. On the outer surface 25 of the dielectric block 1, the strip portion 52 extends meandering from the outer surface 21 toward the outer surface 22 and is continuous with the outer conductor 3 at the position of the outer surface 22.

FIG. 15 is a perspective view showing still another embodiment of the dielectric filter according to the present invention. The strip conductor 5 has two strip portions 52 and 53 extending from the coupling portions 511 and 512 provided on the outer surface 21. The coupling portions 511 and 512 are provided at a distance from each other and commonly face the extension portion 121 of the second terminal electrode 12. The strip portion 52 is continuous with the coupling portion 511, extends from the outer surface 21 toward the outer surface 22 on the outer surface 25 of the dielectric block 1, and is continuous with the outer conductor 3 at the position of the outer surface 22.

The strip-shaped portion 53 is continuous with the joint portion 512, is provided on the outer surface 25 of the dielectric block 1 with a gap from the joint portion 511, extends in the direction from the outer surface 21 to the outer surface 22, and has a tip on the outer surface 25. Is connected to the outer conductor 3 at a substantially middle portion.

In the case of this embodiment, the second terminal electrode 12
Between the extension 121 of the outer conductor 3 and the outer conductor 3, the LC series resonance circuit including the coupling portion 511 and the strip portion 52, and the coupling portion 5
A circuit in which an LC series resonance circuit including 12 and the strip portion 53 is interposed in parallel is obtained. The two LC series resonance circuits have different resonance characteristics.

FIG. 16 is a perspective view showing still another embodiment of the dielectric filter according to the present invention, and FIG. 17 is a perspective view of the dielectric filter shown in FIG. 16 seen from the back side. In the illustrated embodiment, the first terminal electrode 11 is provided independently of the outer conductor 3 and across the outer surface 24 to the outer surface 21. The second terminal electrode 12 is also provided independently of the outer conductor 3 and across the outer surface 24 and the outer surface 21.

The strip conductor 5 extends in a strip shape on the outer surface 21 along the outer edge of the third coupling conductor 631, and the coupling portion 51 is
The extension 121 of the second terminal electrode 12 is formed through the gap.
To face. The strip-shaped conductor 5 includes a strip-shaped portion 52 extending from the middle of the coupling portion 51 provided on the outer surface 21, and the strip-shaped portion 52 extends from the outer surface 23 of the dielectric block 1 in the direction from the outer surface 21 to the outer surface 22. It is continuous with the outer conductor 3 at the position 22. The outer surface 23 provided with the strip portion 52 has a first
And the outer surface 24 on which the second terminal electrodes 11 and 12 are provided.

Although illustration is omitted, the arrangement of the first and second terminal electrodes 11 and 12 and the strip conductor 5 shown in FIGS. 16 and 17 is the same as that of the embodiment shown in FIGS. However, it is naturally applicable.

FIG. 18 is a perspective view showing still another embodiment of the dielectric filter according to the present invention. In the illustrated embodiment, the resonance part that defines the pass band is composed of two first and second resonance parts Q1 and Q2, and the open ends of the resonance part are provided on the inner surfaces of the holes 41 and 42. . Outer conductor 3
Are present on all six outer surfaces 21-26 of the dielectric block 1.

The first hole 4 provided in the first resonating portion Q1.
Reference numeral 1 denotes a through hole that opens on both the outer surface 21 and the outer surface 22. The first inner conductor 61 is the outer surface 2 of the dielectric block 1.
At 1 and 22, the outer conductor 3 is continuous.

The second hole 4 provided in the second resonating part Q2.
Reference numeral 2 is also a through hole opened on both the outer surface 21 and the outer surface 22. The second inner conductor 6 provided inside the second hole 42
2 is continuous with the outer conductor 3 on the outer surfaces 21 and 22 of the dielectric block 1.

The first terminal electrode 11 is provided on the outer surfaces 23 and 26 of the dielectric block 1 independently of the outer conductor 3.
It is electrically coupled to the first inner conductor 61 via the dielectric block 1. A gap G21 exposing the surface 23 of the dielectric block 1 is provided between the first terminal electrode 11 and the outer conductor 3, and the first terminal electrode 11 has this gap G21.
It is independent of the outer conductor 3 by 21. The first terminal electrode 11 is provided so as to extend from the outer surface 23 to the outer surface 26.

The second terminal electrode 12 is provided on the outer surfaces 23 and 25 of the dielectric block 1 independently of the outer conductor 3.
It is electrically coupled to the second inner conductor 62 via the dielectric block 1. A gap G22 exposing the surface 23 of the dielectric block 1 is provided between the second terminal electrode 12 and the outer conductor 3, and the second terminal electrode 12 has this gap G2.
It is independent of the outer conductor 3 by 2. The second terminal electrode 12 is provided so as to extend from the outer surface 23 to the outer surface 25.

The strip-shaped conductor 5 is formed on the outer surface 2 of the dielectric block 1.
5 is provided side by side with the gap G41 from the second terminal electrode 12, and the coupling portion 51 faces the second terminal electrode 12 via the gap G41. The band-shaped conductor 5 has a connecting portion 5
The strip-shaped portion 52 extends from the outer surface 25 of the dielectric block 1 in the direction from the outer surface 21 to the outer surface 22 and is continuous with the outer conductor 3 at the position of the outer surface 22. Although the illustrated strip portion 52 has a meandering pattern, it may have another pattern.

FIG. 19 is a perspective view showing still another embodiment of the dielectric filter according to the present invention. In FIG.
The same reference numerals are given to the same constituent parts as those shown in FIG. The strip-shaped conductor 5 is provided so as to straddle the outer surface 23 and the outer surface 25 of the dielectric block 1, and is provided side by side on the outer surfaces 23 and 25 with a gap G41 from the second terminal electrode 12. Coupling part 51
Faces the second terminal electrode 12 on the outer surfaces 23 and 25 via the gap G41. The strip-shaped portion 52 extending from the coupling portion 51 is provided on the outer surface 25 of the dielectric block 1.
From the outer surface 21 toward the outer surface 22 and are continuous with the outer conductor 3 at the position of the outer surface 22. Although the illustrated strip portion 52 has a meandering pattern, it may have another pattern.

FIG. 20 is a perspective view showing still another embodiment of the dielectric filter according to the present invention. In the figure,
8, the same components as those shown in FIG. 19 are designated by the same reference numerals, and a duplicate description will be omitted.

The strip conductor 5 is formed on the outer surface 2 of the dielectric block 1.
3 and the outer surface 25. Coupling part 51
On the outer surface 23 through the gap G41
Facing the terminal electrode 12. The strip-shaped portion 52 extending from the coupling portion 51 advances on the outer surface 25 of the dielectric block 1 while swirling in the clockwise direction, and then turns in the counterclockwise direction and swirls, and its end is connected to the outer conductor 3.

The dielectric filter has been described above in detail with reference to FIGS. For the sake of space, the description of these is limited to the above, but it is shown and described that more resonators can be provided, in the case of a dielectric resonator at least one resonator is provided. It is obvious that there can be many combinations of the respective embodiments.

Next, a duplexer which is another important application example of the dielectric device according to the present invention will be described.

FIG. 21 is a perspective view of the duplexer according to the present invention. The illustrated duplexer has six first resonance parts Q1 to Q6. Each of the first resonating units Q1 to Q6 shares the dielectric block 1 and
Are integrated through. In the dielectric block 1, most of the outer surfaces 22 to 26 are covered with the outer conductor 3 except for one surface which is the outer surface 21.

Since the duplexer is used as an antenna duplexer, the first to third resonating parts Q1 to Q3, and
Any one of the fourth to sixth resonance parts Q4 to Q6 is for transmission,
The other is for reception. Since the transmission frequency and the reception frequency are different from each other, the resonance characteristics of the first to third resonance sections Q1 to Q3 are different from the resonance characteristics of the fourth to sixth resonance sections Q4 to Q6.

The illustrated duplexer has first to third resonance parts Q1 to Q3 and fourth to sixth resonance parts Q4 to Q.
16 corresponds to a structure in which the structure of the dielectric filter shown in FIG. 16 is applied and these are integrated by the dielectric block 1.

Of the first to third resonance parts Q1 to Q3 on the transmitting side, the first terminal 11 provided on the outer surface 24 of the first resonance part Q1 has the dielectric layer formed by the dielectric block 1. Are connected through.

Of the fourth to sixth resonance parts Q4 to Q6, in the sixth resonance part Q6, the third terminal 13 provided on the outer surface 24 side of the dielectric block 1 is provided with the third block 13. Via a dielectric layer according to The details of the capacitive coupling in this case are as already described.

Furthermore, the intermediate third and fourth resonance parts Q3,
The second terminal 12 for antenna connection is connected to Q4 on the outer surface 24 side.

The first to third terminals 11 to 13 have an outer surface 24.
In the above, it is arranged in a state of being electrically insulated from the outer conductor 3 by the insulating gap.

The illustrated duplexer has a strip conductor 50.
It contains 0 and 510. The strip conductor 500 has an outer surface 21.
And extends in a strip shape along the outer edge of the third coupling conductor 631,
The strip-shaped portion 501 has the second terminal electrode 1 through the gap.
It opposes the second extension 121.

The strip-shaped conductor 500 includes a strip-shaped extension 502 extending from the middle of the strip-shaped portion 501 provided on the outer surface 21, and the strip-shaped extension 502 is provided on the outer surface 2 of the dielectric block 1.
3 extends from the outer surface 21 toward the outer surface 22 and is continuous with the outer conductor 3 at the position of the outer surface 22. The outer surface 23 on which the strip-shaped extension 502 is provided has the first to third terminal electrodes 11 to 13.
Facing the outer surface 24 provided with.

The strip conductor 510 extends in a strip shape on the outer surface 21 along the outer edge of the sixth coupling conductor 661, and the coupling portion 51 is formed.
1 faces the extension 131 of the third terminal electrode 13 via the gap. The strip-shaped conductor 510 has a strip-shaped extension 512 extending from the middle of the coupling portion 511 provided on the outer surface 21.
The strip-shaped extension 512 extends from the outer surface 23 of the dielectric block 1 in the direction from the outer surface 21 to the outer surface 22, and is continuous with the outer conductor 3 at the position of the outer surface 22. The outer surface 23 on which the strip-shaped extension 512 is provided is the first to third terminal electrodes 11.
To an outer surface 24 provided with ˜13.

Although illustration is omitted, it goes without saying that various structures (see FIGS. 1 to 20) exemplified by the dielectric resonator or the dielectric filter can be applied to the duplexer.

[0087]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a dielectric device capable of providing a notch filter function while maintaining the dielectric block in a substantially rectangular parallelepiped shape. (B) It is possible to provide a dielectric device suitable for miniaturization.

[Brief description of drawings]

FIG. 1 is a perspective view of a dielectric resonator according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a diagram showing bandpass filter characteristics and insertion loss characteristics of the dielectric filter according to the examples of FIGS. 1 and 2.

FIG. 4 is a perspective view showing another embodiment of the dielectric filter according to the present invention.

FIG. 5 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 6 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 7 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

8 is a cross-sectional view taken along line 8-8 of FIG.

FIG. 9 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 10 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

11 is a cross-sectional view taken along line 11-11 of FIG.

FIG. 12 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 13 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 14 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 15 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 16 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 17 is a perspective view of the dielectric filter shown in FIG. 16 viewed from the back side.

FIG. 18 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 19 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 20 is a perspective view showing still another embodiment of the dielectric filter according to the present invention.

FIG. 21 is a perspective view of a duplexer according to the present invention.

[Explanation of symbols]

1 Dielectric block 21-26 outer surface 3 outer conductor 41-46 1st-6th holes 5, 7 band conductor 51, 71 joint 52, 72 band

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koji Tashiro             1-13-1, Nihonbashi, Chuo-ku, Tokyo             -In DC Inc. F term (reference) 5J006 HA03 HA04 HA15 HA26 HA27                       JA01 JA12 KA01 KA13 LA21                       NA04 NC03

Claims (9)

[Claims] 1. A dielectric device including a dielectric block, at least one hole, a terminal electrode, and a strip conductor, wherein the dielectric block is a substantially rectangular parallelepiped whose outer surface is covered by an outer conductor. The hole is provided in the dielectric block, one end of the hole is opened to one of the outer surfaces of the dielectric block, extends toward the other outer surface facing one of the outer surfaces, and the hole is formed on the inner surface of the outer surface. An inner conductor continuous with a conductor is provided, the terminal electrode is provided on the outer surface of the dielectric block independently of the outer conductor, and electrically connected to the inner conductor via the dielectric block. A dielectric device in which the band-shaped conductors are coupled to each other, are provided on the outer surface of the dielectric block with a gap from the terminal electrode, and face the terminal electrode via the gap. 2. The dielectric device according to claim 1, wherein the strip conductor is continuous with the outer conductor. 3. The dielectric device according to claim 1, wherein the band-shaped conductor is plural. 4. The dielectric device according to claim 1, wherein the holes are plural, the terminal electrodes are plural, and each of the terminal electrodes is arranged corresponding to one of the plural holes. Dielectric device. 5. The dielectric device according to claim 1, wherein the dielectric block has a groove on the outer surface, and the strip-shaped conductor is provided inside the groove. Dielectric device. 6. The dielectric device according to claim 1, wherein the dielectric block has a convex portion on the outer surface, and the strip-shaped conductor is provided on a surface of the convex portion. Dielectric device. 7. The dielectric device according to claim 1, wherein the band-shaped conductor is a curved path. 8. The dielectric device according to claim 1, wherein the strip-shaped conductor is provided so as to extend over an adjacent outer surface of the dielectric block. 9. The dielectric device according to claim 1, wherein the terminal electrode is provided so as to extend over an adjacent outer surface of the dielectric block.