JPS6338885B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dielectric coaxial resonator having a characteristic terminal structure.

[Background of the invention]

When constructing a filter device, such as a duplexer, using a coaxial resonator having a dielectric material between the inner and outer conductors (hereinafter simply referred to as a dielectric coaxial resonator), there are broadly two possible structures.

One is the structure shown schematically in FIG. 1, as disclosed in Japanese Patent Application Laid-Open No. 56-57302.
The other is a structure shown schematically in FIG. 2, as disclosed in Japanese Patent Application Laid-Open No. 56-57304.

In the structure shown in FIG. 1, the inner conductors of dielectric coaxial resonators 2 are connected so as to hang from the signal propagation path 1, and a coupling capacitor C is connected between the inner conductors of adjacent dielectric coaxial resonators 2. Therefore, it is necessary to provide a cut-off space 3 on the open end side of each dielectric coaxial resonator 2. What is cutoff space?
The size and shape are determined so that adjacent dielectric coaxial resonators 2 are not coupled by electromagnetic waves,
Therefore, adjacent dielectric coaxial resonators 2 are coupled by a coupling capacitor C.

However, unnecessary coupling has sometimes occurred due to leakage signal components propagating along the inner surface of the case forming the cutoff space. Furthermore, each dielectric coaxial resonator always requires one cut-off space, which has been an obstacle to miniaturization.

On the other hand, in the structure shown in FIG. 2, the signal propagation path 1 and the dielectric coaxial resonator 2 are arranged so that their axial directions coincide, and the open ends of the 1/4 wavelength dielectric coaxial resonator 2 are connected to the capacitor C. and the shorted ends are magnetically coupled. Even in such a structure, the first
Although a cut-off space 3 is required as in the structural example shown in the figure, since one cut-off space 3 can be shared by two dielectric coaxial resonators 2, 2 facing each other, the case can be made smaller accordingly. In addition, unnecessary binding is less likely to occur. However, when constructing a filter, it becomes necessary to partially adopt an inductive (magnetic) coupling structure, which is structurally more complicated than capacitor coupling.
Also, if it is summarized by capacitor coupling, 1/2
A wavelength dielectric coaxial resonator must be used, which goes against the trend of miniaturization.

Therefore, the inventors of the present invention have proposed a new duplexer that solves the above problems.
This new duplexer will be explained with reference to FIG.

Dielectric coaxial resonators 2 that utilize coaxial TM mode resonance are distributed on both sides of the signal propagation path 1, and their open ends are placed opposite each other. By sharing one cut-off space 3 and coupling the stages with a capacitor that is more advantageous than inductive coupling, an extremely rational arrangement can be obtained, and a filter that is small, has no unnecessary coupling, and has a simple structure suitable for mass production can be obtained. be able to. The dielectric coaxial resonator 2 itself is well known, and as is clear from FIG. The inner conductor 22 and the outer conductor 23 are formed by baking silver paste on the inner wall surface and outer peripheral surface of the body 21 (such as a square tube) or by electroless copper plating, and the inner conductor 22 is formed on the entire bottom surface in the figure.
An electrode 24 for short-circuiting the outer conductor 23 and the outer conductor 23 is formed in the same manner.

[Description of prior art]

By the way, as is clear from FIG. 4, when connecting the inner conductor 22 of this type of dielectric coaxial resonator 2 to the outside, a metal rod-shaped terminal 26 having a stopper collar 25 has conventionally been used. .
That is, the metal rod-shaped terminal 26 was inserted into the center hole of the dielectric coaxial resonator 2 from the open end side, and the terminal 26 and the inner conductor 22 were bonded together using a conductive adhesive.

[Problem that the invention seeks to solve]

In the conventional metal rod-shaped terminal 26 as described above, conductive adhesive is used when connecting to the inner conductor 22 of the dielectric coaxial resonator, making the connection work complicated. is inner conductor 2
In some cases, the dielectric coaxial resonator protruded from the hole provided in No. 2 to the voltage-open end face side, changing the characteristics of the dielectric coaxial resonator.

In addition, when used in a filter or a duplexer as described above, it is necessary to connect a capacitor to the metal bar terminal 26, but since it has a structure in which many dielectric coaxial resonators are capacitor-coupled, the capacitor electrode The connection work was extremely complicated.

Therefore, an object of the present invention is to provide a structure that allows easy connection to the inner conductor of a dielectric coaxial resonator and facilitates interstage coupling in a dielectric filter or duplexer as described above. An object of the present invention is to provide a dielectric coaxial resonator having a terminal equipped with the following.

[Means for solving problems]

A dielectric coaxial resonator equipped with a terminal according to the present invention includes a plate-shaped portion, a plurality of tongue-shaped contact portions extending radially from the periphery of the plate-shaped portion and bent, and a portion of the plate-shaped portion directed toward the center. Press-fit the terminal, which has a connection part that was previously cut and bent in the opposite direction to the tongue-shaped contact part, and a stopper that extends radially from the periphery of the plate-shaped part, into the entrance of the center hole on the open end side of the dielectric coaxial resonator. The dielectric coaxial resonator is coupled to the outside through this terminal.

[Effect]

Since the plurality of tongue-shaped contact parts extend radially from the periphery of the plate-shaped part and are bent, by press-fitting the tongue-shaped contact parts into the center hole entrance on the open end side of the dielectric coaxial resonator, the dielectric The inner conductor of the coaxial resonator and the tongue-shaped contact portion are electrically connected easily and reliably. Since a stopper extends radially around the periphery of the plate-like portion, the stopper reliably limits the degree of press-fitting of the tongue-like contact portion into the center hole of the dielectric coaxial resonator to a desired depth. Ru. Furthermore, the connecting portion is bent from the plate-like portion in the opposite direction to the tongue-like contact portion. Therefore, using the connection part, for example, capacitor electrodes can be easily soldered.

[Explanation of Examples]

11 to 13 are a developed view, a plan view, and a side view for explaining a terminal used in a dielectric coaxial resonator according to an embodiment of the present invention.
The terminal 90 includes a disk-shaped portion 91 and a disk-shaped portion 9.
A plurality of tongue-shaped contact portions 92 extending radially from the periphery of the disc-shaped portion 91; a tongue-shaped connecting portion 93 cut toward the center from a part of the disc-shaped portion 91; A metal piece integrally formed with a stopper 94 extending the minimum length necessary for the contact portion 92
is bent at about 90 degrees with respect to the disc-shaped portion 91, and the whole is bent into a “he” shape to give it spring properties.
The connecting portion 93 has a configuration in which the disc-shaped portion 91 is bent in the opposite direction to the contact portion 92 .

(Referring to FIGS. 12 and 13) Since the contact portion 92 has a spring property, when inserted into the center hole of the dielectric coaxial resonator 2, the contact portion 92
2 is pressed against the inner conductor 22, and electrical connection with the inner conductor 22 and fixing of the terminal 90 to the dielectric coaxial resonator 2 can be easily accomplished.

On the other hand, the connection portion 93 is used for connection with the outside, for example, connection with a capacitor electrode. Since this connecting portion 93 is plate-shaped, the capacitor electrodes can be easily connected by, for example, soldering.

Further, the stopper 94 is provided to limit the insertion depth of the contact portion 92 into the center hole of the dielectric coaxial resonator 2, and thereby the stopper 94 is provided to limit the insertion depth of the contact portion 92 into the center hole of the dielectric coaxial resonator 2. It is possible to make the amount of protrusion from the open end side constant.

Note that the shape and number of the contact portion 92, the connection portion 93, and the stopper 94 are arbitrary.

When using the terminal 90 as described above, the connecting portion 93 can be fixed to a capacitor electrode or the like, while the member having the capacitor electrode is usually fixed in position. Therefore, if the terminal 90 is connected and fixed to a member having a capacitor electrode using the connecting part 93, the dielectric coaxial resonator 2 can be extrapolated to the tongue-shaped contact part 92 of the fixed terminal 90. The positioning of the dielectric coaxial resonator 2 and the connection between the inner conductor 22 and the terminal can be performed by simply (that is, by simply covering the contact portion 92 with the dielectric coaxial resonator 2 using the center hole of the dielectric coaxial resonator 2) This can dramatically improve assembly workability. Furthermore, since the contact portion 92 has spring properties, there is no fear of it falling out from the dielectric coaxial resonator.

Next, a duplexer in which the dielectric coaxial resonator of the embodiment including the terminal 90 described above is suitably used will be described.

5 and 6 are diagrams showing the arrangement inside the duplexer case 4. In FIG. 5, the right half shows the six dielectric coaxial resonators 2 used in the first filter section. shows the parts assembled into the configuration shown in FIG. On the other hand, the left half is a part in which six dielectric coaxial resonators 2 used in the second filter part are configured as shown in FIG.

The second filter section is connected to the first filter section by a coaxial cable or stripline 6. In the figure, 7 is a common input/output connector for the first and second filter sections, 8 is a dedicated input/output connector for the first filter section, and 9 is a dedicated input/output connector for the second filter section.

The coupling capacitors used in the first and second filter sections may be ordinary capacitors that are discrete components and are preferably
Composite capacitor components 30, 40 as shown in the figure are used. When using the terminal 90 described above, connection to any capacitor is easy, but in the case of the composite capacitor component 30, connection can be more easily achieved.

The composite capacitor component 30 has capacitor electrodes 32, 33, 34, 35, 36, 37, 3 on one surface of a plate-like dielectric plate 31 made of ceramic dielectric or the like.
For example, when used in the first filter section, the connector 7 is connected to the center conductor of the stripline 6, and the electrode 33 is connected to the upper end in the figure. The terminal of the first stage dielectric coaxial resonator 2 is connected to the electrode 34, and the terminal of the second stage dielectric coaxial resonator 2 is connected to the electrode 34 at the lower end in the figure. Similarly, the electrode 35 is connected to the terminal of the third stage dielectric coaxial resonator 2 at the upper end in the figure, and the electrode 36 is connected to the terminal of the fourth stage dielectric coaxial resonator 2 at the lower end in the figure. The terminal of the dielectric coaxial resonator 2 is connected to the electrode 37, the terminal of the fifth stage dielectric coaxial resonator 2 is connected at the upper end in the figure, and the electrode 38 is connected to the terminal at the lower end in the figure. The terminal of the sixth stage dielectric coaxial resonator 2 is connected to the side end.
Connector 8 is connected to electrode 39 .

The same applies when the composite capacitor component 30 is used in the second filter portion.

The composite capacitor component 30 is connected to the terminal of each dielectric coaxial resonator 2 as described above, but if the terminal 90 described above is used as this terminal, since the connection part 93 is formed in a plate shape, this Connection work can be performed extremely easily and efficiently. Therefore, if this dielectric coaxial resonator is used, it becomes possible to easily and reliably perform interstage coupling in such a duplexer.

The same applies to the case where the composite capacitor component 40 shown in FIG. 8 is used. This composite capacitor component 40
Here, electrodes 42-49 each function similarly to electrodes 32-39 in composite capacitor component 30 described above.

As described above, the capacitor electrodes of the capacitor components 30 and 40 can have any shape, and the shape and size can be arbitrarily determined so as to obtain the required capacitance. and,
Since the substrates of such composite capacitor parts 30, 40 are fixed by being fitted into a case, etc., as mentioned above, if the terminals 90 are connected to each capacitor electrode in advance, the fixed terminals can be fixed. By simply extrapolating and fixing the dielectric coaxial resonator 2 to 90, a duplexer as described above can be obtained.

FIGS. 9 and 10 show a second example of a duplexer in which the dielectric coaxial resonator equipped with the terminal of the present invention is suitably used. In FIG. 9, parts that are the same as those of the duplexer shown in FIGS. 5 and 6 described above are given the same numbers, and their explanations will be omitted. The difference is that the connector 7 is placed on one center line of the case 50, and the connector 8 is placed on the other center line.
and the connector 9 is arranged.

In addition, the dielectric coaxial resonator of the present invention can also be suitably used in a duplexer having a structure in which first and second filter parts are stacked, by configuring each filter part in the same way.

〔Effect of the invention〕

As described above, according to the present invention, since the terminal is provided with a plurality of tongue-like contact portions, electrical connection between the terminal and the inner conductor of the dielectric coaxial resonator is easy, and the dielectric The characteristics of the coaxial resonator can also be kept stable. In addition, this terminal has a plate-shaped connection part bent in the opposite direction to the tongue-shaped contact part, so it is easy to connect to the outside, and therefore it can be used as a stage in the duplexer or filter as described above. It becomes possible to easily and efficiently perform intercoupling.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing an example of a filter device configured using a dielectric coaxial resonator, FIG. 2 is a schematic explanatory diagram showing another example, and FIG. A schematic explanatory diagram of a filter in which a dielectric coaxial resonator is suitably used, FIG. 4 is a cross-sectional view of a conventional dielectric coaxial resonator, and FIG. 5 is a duplexer configured using the filter of FIG. 3. 6 is a side view of the duplexer shown in FIG. An internal layout diagram showing another example of a duplexer in which a resonator is suitably used, FIG. 10 is an internal layout diagram as seen from the side of the duplexer in FIG. 9, and FIG. 11 is an embodiment of the present invention. FIG. 12 is a plan view of the terminal shown in FIG. 11, and FIG. 13 is a side view of the terminal shown in FIG. In the figure, 90 is a terminal, 91 is a disc-shaped portion, 92 is a contact portion, 93 is a connecting portion, and 94 is a stopper.

Claims (1)

[Claims] 1. A plate-shaped part, a plurality of tongue-shaped contact parts extending radially from the periphery of the plate-shaped part and bent, and a part of the plate-shaped part cut toward the center in the opposite direction to the tongue-shaped contact parts. A terminal equipped with a bent connection part and a stopper extending radially from the periphery of the plate-shaped part is press-fitted into the center hole entrance on the open end side of the dielectric coaxial resonator, and the dielectric coaxial is connected to the outside through this terminal. A dielectric coaxial resonator with terminals, consisting of coupled resonators.