JP2000299601A - Dielectric device and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dielectric device and a production method thereof in which plural filters are integrally provided and production is facilitated. SOLUTION: Concerning a dielectric device 10, plural through holes 14, 15 and 16 passing through both end faces are opened on a main body 11 formed of a dielectric member, an outer conductor layer 20 and inner conductor layers 21-23 are respectively arranged on the outer peripheral surface of this main body 11 and the inner surfaces of the through holes 14-16, and a recessed part 30 provided so as to delete the through holes 14-16 is opened at the nearly central part of the main body 11 so that two comb line dielectric resonators 31 and 32 can be formed. This dielectric device 10 is produced by performing a process for forming the main body 11 of dielectric into form opening plural through holes 14-16 passing through both end faces 12 and 13, a process for respectively arranging the conductor layers on the outer peripheral surface of the main body 11 of dielectric and the inner surfaces of the respective through holes 14-16 and a process for opening the recessed part 30 by deleting the almost central part of the main body 11 of dielectric together with the through holes 14-16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric device having a dielectric filter used for high-frequency signals of several hundred MHz to several GHz. Specifically, 2
The present invention relates to an integrated dielectric filter and a dielectric duplexer integrally provided with a plurality of dielectric filters.

[0002]

2. Description of the Related Art Various high-frequency signal filters are used in communication devices. In particular, with the spread of mobile communication devices such as mobile phones and the increase in communication use, various filters have been reduced in size and mass-produced. In addition, there is a demand for improved filter characteristics. Conventionally, as a filter used at a high frequency, there is a dielectric filter using a coaxial dielectric resonator. The coaxial dielectric resonator has one or more through-holes passing through both end surfaces of a main body formed by a dielectric member, and an outer conductor layer is formed on an outer peripheral surface of the main body and an inner surface of the through-hole, respectively. And an inner conductor layer, and is an element that resonates electromagnetic waves in the main body. If a conductor layer is applied to one of the end faces, a quarter-wavelength resonator is obtained. If a conductor layer is applied to both end faces, or if neither end face is provided, a half-wavelength resonator is obtained.

As shown in FIG. 9, a dielectric resonator (100) (100) having a plurality of through holes formed in a dielectric body forms a coaxial dielectric resonator for each through hole, It is called a “line-type dielectric resonator”. As shown in FIG. 10, a comb-line dielectric resonator (100) includes a plurality of coaxial dielectric resonators.
(91), (92) and (93) are adjacent in parallel, and the adjacent resonators are magnetically coupled. Comline type dielectric resonator (10
(0) are the input / output stage resonators (91) and (93) located at both ends in parallel.
Are capacitively coupled to the external input / output terminals (94) and (95), respectively, to form a band-pass filter.

[0004]

In communication equipment, a device having a plurality of filters is often provided, or a plurality of filters are provided in close proximity. For example, as shown in FIG. 8, the duplexer (110) is a device that performs both transmission and reception with respect to the antenna (111), and includes a transmission filter and a reception filter. further,
Transmission filter between transmitter (112) and duplexer (110)
(114) and amplifier (116) are deployed, and the duplexer (11
A receiving filter (115) is provided between the receiver (0) and the receiver (113). The transmission filter (114) and the reception filter (11
5) may be deployed in close proximity.

FIG. 9 shows a conventional dielectric duplexer. In the dielectric duplexer (120), a comb line type dielectric resonator for transmission (100a) and a comb line type dielectric resonator for reception (100b) are provided on a substrate (121). Further, on the substrate (121), each comb-line type dielectric resonator (10
0a) and (100b) inner conductor layers of the input / output stage (101a) (101a) (10
1b) Capacitors (122) (122) for capacitive coupling with (101b)
(122) (122) and metal terminals (1) connecting the inner conductor layers (101a) (101a) (101b) (101b) and the capacitors (122) (122) (122) (122).
23) ((123) (123) (123) and a matching coil (124) are provided.
It is necessary to separately arrange two comb-line type dielectric resonators on a substrate, and to arrange a number of necessary external parts such as capacitors, metal terminals, and matching coils. Therefore, the number of assembling steps is increased, and the size of the device is increased.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dielectric device which comprises a plurality of filters integrally and which is easy to manufacture, and a method for manufacturing the same.

[0007]

In order to solve the above-mentioned problems, a dielectric device of the present invention is provided with a plurality of through holes passing through both end surfaces of a main body formed by a dielectric member. An outer conductor layer and an inner conductor layer are provided on the outer peripheral surface and the inner surface of the through-hole, respectively, and a concave portion provided so as to delete the through-hole is opened at a substantially central portion of the main body, thereby forming two comb lines. A shaped dielectric resonator is formed. In the dielectric device, a step of forming a dielectric body in a shape in which a plurality of through holes passing through both end surfaces are opened, a step of disposing a conductor layer on an outer peripheral surface of the dielectric body and an inner surface of each through hole, It is manufactured by performing a step of opening a concave portion by deleting a substantially central portion of the dielectric body together with a through hole.

[0008]

Operation and Effect The dielectric device having the above-described structure integrally includes two comb-line type dielectric resonators, and includes a coupling capacitor connected to the inner conductor layer of the input / output stage in each resonator. Or, by forming an input / output electrode insulated from the outer conductor layer in a part of the outer peripheral surface region facing the through hole of the input / output stage in each resonator,
Two band-pass dielectric filters are integrally provided. As a result, since components such as a substrate and metal terminals are not required, the number of components and the number of assembling steps can be reduced, and the volume occupied by the filter in the device can be reduced. Further, the dielectric device can be easily manufactured only by adding a step of forming a concave portion to the conventional method of manufacturing a coaxial dielectric resonator.

[0009]

Embodiments of the present invention will be described below. Embodiment 1 FIGS. 1A and 1B show a dielectric device of this embodiment having two dielectric filters integrally. The dielectric device (10) has a main body (11) formed by a plate-shaped dielectric member and passes through both end faces (12) and (13).
The through holes (14), (15), (16) are opened, the outer peripheral surface of the main body (11), the inner surface of the through holes (14), (15), (16) and both end surfaces (1) of the main body (11).
2) (13) is coated with a conductive material, and the outer conductor layer (2
0), inner conductor layers (21) (22) (23) and end surface conductor layers (24) (25) are provided.

At substantially the center of the main body (11), through holes (14) (15) (1
By opening the concave portion (30) provided so as to delete 6), both ends become the comb-line type dielectric resonators (31) and (32). The resonators (31) and (32) have conductor layers (24) on the end faces (12) and (13).
(25) is provided, and the dielectric body (1) is provided on the walls (33) and (34) of the recess (30).
Since 1) is exposed, it becomes a quarter-wave resonator. The resonance frequency of each of the resonators (31) and (32) is determined by the position and width of the concave portion (30).

Each of the resonators (31) and (32) is formed in a frame shape by extending from the side surface to the bottom surface of the outer peripheral surface region facing the through holes (14) (14) (16) (16) of the input / output stage. Thereby, the input / output electrodes (35) to (38) insulated from the outer conductor layer (20) are formed. It is desirable that the input / output electrodes (35) to (38) are arranged near the wall surfaces (33) and (34) of the concave portion (30) which is an open end.

The material of the main body (11) is suitably made of a high dielectric constant ceramic such as barium oxide, titanium oxide, neodymium oxide and the like. Also, the conductor layers (20) to (25) and the input / output electrodes (35)
As the conductive material of (38), a high conductivity material such as silver or copper is suitable.

To manufacture the dielectric device (10) having the above structure, first, a plurality of through holes (14) passing through both end faces (12) and (13) are formed.
(15) A flat plate-shaped dielectric main body (11) provided with (16) is prepared by a known method such as a powder press. Next, the dielectric body
On the outer peripheral surface of (11), the inner surfaces of through holes (14) (15) (16), and both end surfaces (12) (13), conductor layers (20) (21) (22) (23) (24) (2
5) is deployed by printing, vapor deposition, etc. Next, a substantially central portion of the upper surface of the main body (11) is pierced with a through hole (14) (1
5) Delete with (16) to open the recess (30). And
By removing a predetermined area of the outer peripheral surface into a frame shape by ultrasonic processing or the like, the input / output electrodes (3) insulated from the outer conductor layer (20) are removed.
5) to (38) are formed, thereby completing the dielectric device (10). The input / output electrodes (35) to (38) are formed of the conductor layers (20) and (2).
1) It can be formed in the step of disposing the (22), (23), (24), and (25).

The dielectric device (10) having the above-described structure includes inner conductor layers (21), (21), (23), and (2) of input / output stages in each of the resonators (31) and (32).
Since 3) is capacitively coupled to the input / output electrodes (35) to (38), two band-pass dielectric filters are integrally provided. As a result, two dielectric filters can be integrally formed without using external components such as a substrate, metal terminals, and input / output capacitors, so that the number of components and the number of assembly steps can be reduced, and the dielectric filter for the equipment can be reduced. The occupied volume can be reduced. Further, the dielectric device (10),
It is a surface mount type device that can be directly mounted on the circuit board surface. Further, the dielectric device (10) is different from the conventional method of manufacturing a coaxial dielectric resonator only by adding a step of opening a concave portion (30) and a step of forming input / output electrodes (35) to (38). And can be easily manufactured. When the width and the position of the concave portion (30) are changed, the resonance wavelength of each of the resonators (31) and (32) changes,
The resonance frequency changes. Therefore, the resonance frequency of each of the resonators (31) and (32) can be easily changed.

Embodiment 2 FIGS. 2 and 3A and 3B show a dielectric device according to a second embodiment. Dielectric device of the present embodiment
(40) is different from the dielectric device (10) of the first embodiment,
Through holes (14) (15) (16) and inner conductor layers (21) (22) in recess (30)
The point where (23) is exposed and the two grooves (41) and (42) in the recess (30)
Intersects with the through holes (14) (15) (16) and the through holes (14) (15) (16)
And the input / output electrodes (35) ~
The desirable position of (38) is different, and the others are the same. In the case of the second embodiment, the resonance frequency of each resonator (31) (32) is
It is determined by the positions of the grooves (41) and (42) formed in the concave portions (30). In addition, as shown in FIG.
(35) to (38) are desirably provided near the grooves (41) and (42) which are open ends. In the present embodiment, the concave portion (3
0) has two grooves (41) and (42), but the resonators (31) and (3)
In order to weaken the connection between 2), an additional groove is formed between the grooves (41) and (42), or the through hole (14) (1) between the grooves (41) and (42) is formed.
5) (16) may be deleted and the grooves (41) and (42) may be formed as one groove.

In order to manufacture the dielectric device (40) having the above configuration, first, as in the first embodiment, a dielectric body (11) is formed, and a conductor layer (20) is formed on the dielectric body (11). (21) (22) (23) (24)
Deploy (25). Next, the approximate center of the upper surface of the main body (11) is
A concave portion (30) where the through holes (14), (15), (16) are exposed is opened by removing the through holes (14), (15), and (16) together with a part of the holes using a dicing saw or the like. Next, two grooves (41) are formed in the recess (30).
(42) intersects with the through holes (14), (15), (16) and
5) Establish to delete (16). Then, by removing a predetermined region of the outer peripheral surface into a frame shape by ultrasonic processing or the like, the input / output electrodes (35) to (38) insulated from the outer conductor layer (20)
Is formed, thereby completing the dielectric device (40).

The dielectric device (40) of the present embodiment has a first
It has the same effect as the first embodiment, and has a feature that the resonance frequency of the resonators (31) and (32) can be easily adjusted by the grooves (41) and (42), as compared with the first embodiment.

Embodiment 3 FIG. 4 shows a dielectric device according to a third embodiment which is a dielectric duplexer. Dielectric device of the present embodiment
(50) is different from the dielectric device (10) of the first embodiment,
The difference is that the input / output electrodes (37) and (38) formed on one side are connected by a matching inductance conductor pattern (51), and the others are the same. The inductance conductor pattern (51) is formed in a step of forming the input / output electrodes (35) to (38). Dielectric device (50) of the present embodiment
5 has an equivalent circuit as shown in FIG. 5, in which one of the input / output electrodes (37) and (38) formed on one side is connected to the antenna, and the input / output electrode (35) formed on the other side is connected. ) (36) functions as a dielectric duplexer by connecting to a transmitter and a receiver, respectively.

The dielectric device (50) according to the present embodiment is different from the conventional dielectric duplexer (120) (FIG. 9) in the substrate (12).
The dielectric duplexer can be formed integrally without using external components such as 1), metal terminals (123), coupling capacitors (122), matching coils (124), etc., reducing the number of parts and assembly steps. And the volume occupied by the dielectric duplexer with respect to the device can be reduced. Further, the dielectric device
(50) is different from the conventional method for manufacturing a coaxial dielectric resonator only by providing a step of forming a recess (30) and a step of forming input / output electrodes (35) to (38) and an inductance conductor pattern (51). And can be easily manufactured.

Embodiment 4 FIGS. 6A and 6B show a fourth example of a dielectric duplexer.
1 illustrates a dielectric device according to an embodiment. The dielectric device (60) of the present embodiment is a dielectric device of the second embodiment.
(40) (FIGS. 2, 3 (a) and (b)). Instead of input / output electrodes (37) and (38) formed on one side, grooves (41) and (42)
By removing the outer conductor layer (20) from the side surface of the outer peripheral surface region facing the through hole (16c) between the
The antenna electrode (61) insulated from the inner conductor layer (23c) of the through hole (16c), and the inner conductor layers (23a) (23b) of the resonators (31) and (32). Between the cylindrical capacitor (62) (63)
Are different from each other, and the others are the same.

The input / output electrode (35) is capacitively coupled to the inner conductor layer (21a) of one of the input / output stages in the resonator (31), and the inner conductor layer (23a) of the other input / output stage has a cylindrical shape. It is capacitively coupled to the inner conductor layer (23c) between the grooves (41) and (42) via the capacitor (62). Similarly, the input / output electrode (36) is capacitively coupled to the inner conductor layer (21b) of one of the input / output stages in the resonator (32), and the inner conductor layer (23b) of the other input / output stage has a cylindrical shape. It is capacitively coupled to the inner conductor layer (23c) via a capacitor (63). Inner conductor layer
(23c) is capacitively coupled to the antenna electrode (61). Therefore, the dielectric device (60) of the present embodiment is equivalent to the equivalent circuit shown in FIG. 7, and functions as a dielectric duplexer.

As described above, the dielectric device of the present invention provides
Recessed chip-shaped electrical element for capacitive or inductive coupling
(30), and can be capacitively or inductively coupled to the inner conductor layers (21, 23) of the input / output stages of the resonators (31, 32). Further, a metal terminal for connecting the chip-shaped electric element and the inner conductor layer is not required. Therefore, the number of parts and the number of assembly steps can be reduced, and the volume occupied by the filter with respect to the device can be reduced. In the case of the present embodiment, it is desirable that the distance between the grooves (41) and (42) is small in order to reduce the inductance component due to the inner conductor layer (23c) between the grooves (41) and (42).

The description of the above embodiments is for the purpose of describing the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof.
Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims. For example, in the above embodiment, the shapes of the input / output electrodes (35) to (38) and the antenna electrode (61) are rectangular, but if a desired coupling capacitance can be obtained, the size or the shape is arbitrarily changed. it can.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing a dielectric device according to a first embodiment of the present invention, wherein FIG. 1A is a perspective view and FIG. 1B is a perspective view in which FIG.

FIG. 2 is a perspective view showing a dielectric device according to a second embodiment.

3A is a plan view of FIG. 2, and FIG. 3B is a bottom view of FIG.

FIG. 4 is a view showing a dielectric device according to a third embodiment, and is a perspective view corresponding to FIG. 1 (b).

FIG. 5 is an equivalent circuit diagram of the third embodiment.

6A and 6B are diagrams showing a dielectric device according to a fourth embodiment, wherein FIG. 6A is a plan view and FIG. 6B is a bottom view.

FIG. 7 is an equivalent circuit diagram of the fourth embodiment.

FIG. 8 is a block diagram showing a dielectric duplexer and a communication filter used in a communication device.

FIG. 9 is a perspective view showing a conventional dielectric duplexer.

FIG. 10 is an equivalent circuit diagram of a band-pass filter using a comb-line type dielectric resonator.

[Explanation of symbols]

 (10) Dielectric device (11) Dielectric body (12) (13) End face (14) (15) (16) Through hole (20) Outer conductor layer (21) (22) (23) Inner conductor layer (30 ) Recess (31) (32) Comline dielectric resonator (35) (36) (37) (38) I / O electrode

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kenichi Ezaki, 1-1, Sanyo-cho, Daito-shi, Osaka Sanyo Electronics Co., Ltd. (72) Takaaki Uchiyama, 1-1, Sanyo-cho, Daito, Osaka Sanyo F-term (reference) in Electronic Components Co., Ltd. 5J006 HA04 HA15 HA26 HA27 JA01 JA05 KA02 LA23 LA24 LA25 MA04 MA05 NA04 NC01 NC03 NE15 NF03

Claims (9)

[Claims] 1. A body formed by a dielectric member,
A plurality of through-holes passing through both end surfaces are opened, an outer conductor layer and an inner conductor layer are provided on the outer peripheral surface of the main body and the inner surface of the through-hole, respectively, and the through-hole is removed substantially in the center of the main body. A dielectric device in which two comb-line type dielectric resonators are formed by opening a concave portion provided in the device. 2. An end face conductor layer is provided on both end faces of the main body, and a part of an outer peripheral face area facing a through hole of an input / output stage resonator in each comb-line type dielectric resonator is respectively provided. 2. The dielectric device according to claim 1, wherein the input / output electrode insulated from the outer conductor layer is provided near the recess. 3. A body formed by a dielectric member,
A plurality of through-holes passing through both end surfaces are opened, and an outer conductor layer and an inner conductor layer are provided on an outer peripheral surface of the main body and an inner surface of the through-hole, respectively, so that the through-hole is exposed at a substantially central portion of the main body. Is formed, and one or a plurality of grooves are provided in the concave portion so as to intersect with the through hole and to delete the through hole, thereby forming two comb-line type dielectric resonators. A dielectric device on which is formed. 4. An end face conductor layer is provided on both end faces of the main body, and a part of an outer peripheral face area facing a through hole of an input / output stage resonator in each comb-line type dielectric resonator is respectively provided. 4. The dielectric device according to claim 3, wherein the input / output electrode insulated from the outer conductor layer is provided near the groove of the concave portion. 5. The dielectric device according to claim 2, wherein the dielectric device is a dielectric duplexer in which input and output electrodes formed on one side are inductively or capacitively coupled. 6. The recess is provided with two grooves, and on one side is formed a part of an outer peripheral surface region facing a through hole of an input / output stage resonator in each comb line type dielectric resonator. An input / output electrode insulated from the outer conductor layer is provided, and on the other side, a through hole of the input / output stage resonator in each comb line type dielectric resonator, and a through hole sandwiched between grooves in the concave portion. 4. A chip-shaped electric element is provided between each of the antenna electrodes, and an antenna electrode insulated from an outer conductor layer is provided in a part of an outer peripheral surface region facing the through hole sandwiched between the grooves. 3. The dielectric device according to claim 1. 7. An end surface conductor layer is provided on both end surfaces of the main body, and the input / output electrode is provided in proximity to the groove of the concave portion.
The dielectric device according to claim 6. 8. A step of forming a dielectric body into a shape having a plurality of through holes passing through both end faces, a step of disposing a conductor layer on an outer peripheral surface of the dielectric body and an inner surface of each through hole, respectively. A method for manufacturing a dielectric device, comprising a step of opening a concave portion by removing a substantially central portion of a dielectric main body together with a through hole. 9. A step of forming a dielectric main body in a shape having a plurality of through holes passing through both end surfaces, a step of disposing a conductor layer on an outer peripheral surface of the dielectric main body and an inner surface of each through hole, respectively. A step of opening a recess where the through-hole is exposed by removing a substantially central portion of the body together with a part of the through-hole, and forming one or more grooves in the recess with the through-hole and A method for manufacturing a dielectric device, comprising a step of setting up a device to delete the device.