JPH04369103A - Strip line resonator - Google Patents

Abstract

PURPOSE:To prevent the adverse effect of bleeding of a conductive adhesives used to adhere resonance electrodes onto between two dielectric boards in the tri-plate strip line resonator comprising the two dielectric boards in the groove of which the resonance electrode is formed. CONSTITUTION:A groove is formed to a 1st major side of a dielectric board 1, resonance electrodes 2a, 3a, 2b, 3b are formed in the inside of the groove, resonance electrodes 2a', 3a', 2b', 3b' consecutive from the resonance electrode in the groove are formed in a range of a prescribed width around the groove and the resonance electrodes are adhered through a conductive adhesives, The conductive adhesives bleeded to the adhered face of the two dielectric boards stays within the width of the resonance electrodes 2a', 3a', 2b', 3b' around the groove and no new electrode is formed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stripline resonator formed by bonding two dielectric substrates each having a resonant electrode formed thereon.

0002

[Prior Art] Conventionally, strip line resonators are
For example, it is used as a filter in the microwave band. Among these stripline resonators, the so-called triplate type resonator is made by bonding two dielectric substrates with mutually symmetrical resonant electrodes formed thereon.
It has the characteristics of low conduction loss and low electromagnetic field leakage.

FIG. 5 shows the structure of two dielectric substrates constituting a triplate type stripline resonator. Figure 5
1a and 1b are dielectric substrates each having two grooves formed therein, resonant electrodes 2a and 3a are formed on the inner surface of the grooves of the dielectric substrate 1a, and input/output electrodes 4 and 5 are formed on the surface of the dielectric substrate 1a. is formed. Further, resonant electrodes 2b and 3b are formed in the groove of the dielectric substrate 1b. Further, a ground electrode is formed on the back surface of the dielectric substrates 1a, 1b, and the short-circuited end of each resonant electrode is connected to the ground electrode via the side surface of the substrate. By joining and integrating the dielectric substrates with resonant electrodes formed in the grooves,
A stripline resonator with a high no-load Q (Qo) is constructed.

0004

[Problems to be Solved by the Invention] In the triplate type stripline resonator in which a groove is formed on the main surface of a dielectric substrate and a resonant electrode is formed on the inner surface of the groove, the resonant electrodes are electrically connected to each other. In order to connect to the resonant electrode, silver paste is applied to the resonant electrode and baked after bonding, but the silver paste applied to the resonant electrode bleeds into the gap formed between the two dielectric substrates due to capillary action. Therefore, there is a problem in that an unnecessary electrode pattern is formed by subsequent baking. The shape of the unnecessary electrode formed in the resonant electrode part is determined by the seepage of the silver paste due to capillary action, so there is large variation, which not only makes it impossible to obtain stable characteristics but also reduces the yield. It can also be a cause.

FIG. 6 is a plan view of one dielectric substrate obtained by disassembling a stripline resonator that was determined to be defective in a characteristic test. In this way, the silver paste protrudes from the periphery of the resonant electrode, and an unnecessary electrode S is formed by baking the silver paste.

[0006] An object of the present invention is to provide a stripline resonator that can easily obtain desired characteristics by preventing the adverse effects of conductive bonding material protruding from the groove onto the bonding surface of two dielectric substrates. Our goal is to provide the following.

[0007]

[Means for Solving the Problems] The strip line resonator of the present invention is a strip line formed by joining two dielectric substrates, each having a resonant electrode formed on its first principal surface, with the resonant electrodes facing each other. In the resonator, a groove is provided on the first main surface of one or both dielectric substrates, and a continuous resonant electrode is formed from the inner surface of the groove to a certain width around the groove, and the inner surface of the groove and/or Alternatively, the resonant electrode around the groove is bonded via a conductive bonding material.

[0008]

[Operation] In the strip line resonator of the present invention, resonance electrodes are formed on the first main surface of the dielectric substrate, and at least one of the dielectric substrates is provided with a groove on the first main surface. A resonant electrode is continuously formed from the inner surface of the groove to a predetermined width around the groove. The inner surface of the groove and/or the resonant electrode around the groove are bonded via a conductive bonding material. In this way, a resonant electrode is formed not only on the inner surface of the groove but also around it by a certain width, so that the conductive bonding material is spread from the inner surface of the groove to the bonding surface of the two dielectric substrates due to capillary action. Even if it oozes out,
Since the conductive bonding material remains within a certain width of the resonant electrode formed around the groove, an electrode film of the conductive bonding material is simply formed overlapping the resonant electrode, and a new unnecessary electrode pattern is not formed. It never happens. As a result, a stripline resonator with desired characteristics and less variation in characteristics can be obtained.

[0009]

Embodiment FIG. 1 shows the configuration of a stripline resonator according to a first embodiment before assembly. In Figure 1, 1a,
1b is a dielectric substrate with two grooves formed therein;
Resonant electrodes 2a and 3a are formed on the inner surface of the groove on the first principal surface (the surface in the figure) of the dielectric substrate 1a, respectively, and resonant electrodes 2a continuous from the inner surface of the groove are also formed within a certain width around the groove. ', 3a' are formed. Similarly, input/output electrodes 4 and 5 are formed on the first main surface of the dielectric substrate 1a, and second electrodes are formed through the side surfaces of the dielectric substrate 1a.
It extends to a part of the main surface (back surface in the figure). On the other hand, resonant electrodes 2b and 3b are formed in the groove on the first principal surface (the surface in the figure) of the dielectric substrate 1b, and the resonant electrode 2b is continuous from the inner surface of the groove within a certain width around the groove.
', 3b' are formed. In addition, dielectric substrates 1a, 1
In both cases, a ground electrode is formed from the side surface of the substrate to the second main surface.

Two dielectric substrates 1a and 1b shown in FIG.
A conductive bonding material such as silver paste is applied on the resonant electrode on the inner surface of the groove, and an insulating bonding material such as glass frit is applied outside the electrode formation area on the first main surface of the dielectric substrate. The resonant electrodes are stacked so as to face each other to form a laminate as shown in FIG. Thereafter, if necessary, a conductive bonding material such as silver paste is applied to a predetermined location on the side surface of the laminate, dried, and then baked. As a result, two dielectric substrates 1
A triplate type stripline resonator is obtained by laminating layers A and 1B.

FIG. 3 shows a plan view of one dielectric substrate obtained by disassembling the completed stripline resonator. In FIG. 3, S is an electrode formed by baking silver paste that seeped out from the inner surface of the groove between two dielectric substrates bonded together. In this way, the electrodes S are only formed on the resonant electrodes 2a' and 3a' that have been formed in advance within a certain width around the groove, and the shape of the resonant electrodes as a whole does not change. Therefore, the electrode S does not affect the characteristics of the resonator.

Next, FIG. 4 shows the configuration of a stripline resonator according to a second embodiment before assembly. The difference from the first embodiment shown in Fig. 1 is that an electrode of a constant width is provided on the outer edge of the dielectric substrate, which is continuous from the ground electrode, and that input and output electrodes are provided on both of the two dielectric substrates. This is the point I made. That is, in FIG. 4, an electrode 12a having a constant width continuous from the ground electrode is provided on the outer edge of the first main surface of the dielectric substrate 1a, and an electrode 12a having a constant width is provided on the outer edge of the first main surface of the dielectric substrate 1b. A continuous electrode 12b having a constant width is provided. Further, input/output electrodes 4a, 5 are provided on the first main surface of the dielectric substrate 1a.
a, and an input/output electrode 4 is provided on the first main surface of the dielectric substrate 1b.
b, 5b are formed.

Two dielectric substrates 1a and 1b shown in FIG.
Silver paste is applied to each of the resonant electrodes 2a, 3a, 2b, and 3b formed on the inner surface of the groove, and if necessary, an insulating bonding material is applied to the non-electrode forming part, and the first principal surfaces of both substrates are bonded together. They are joined to form a laminate.

[0014] Then, a silver paste for bonding the ground electrode or the input/output electrodes to each other is applied to the side surface of the laminate, dried, and then baked. When silver paste is applied to the side surface of the laminate in this way, even if the silver paste infiltrates between the two dielectric substrates due to capillary action, the silver paste will not be absorbed into the formation area of the electrodes 12a and 12b formed on the outer edges. The shape of the original electrodes 12a, 12b remains unchanged. Therefore, variations in the amount of silver paste infiltrated do not affect the characteristics of the resonator.

[0015]

[Effects of the Invention] According to the present invention, since the conductive bonding material does not protrude outside the resonant electrode forming part, it is possible to easily manufacture a stripline resonator having desired characteristics and with little variation in characteristics. .

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a stripline resonator according to a first embodiment before assembly.

FIG. 2 is a perspective view of a laminate made up of two dielectric substrates shown in FIG. 1;

FIG. 3 is a plan view of a dielectric substrate obtained by disassembling the stripline resonator according to the first example.

FIG. 4 is an exploded perspective view of a stripline resonator according to a second embodiment before assembly.

FIG. 5 is an exploded perspective view of a conventional stripline resonator before assembly.

FIG. 6 is a plan view of one dielectric substrate obtained by disassembling a conventional stripline resonator.

[Explanation of symbols]

1-Dielectric substrate 2,3-resonant electrode 4,5-input/output electrode S-Protruding electrode

Claims (1)

[Claims] 1. A strip line resonator in which two dielectric substrates, each having a resonant electrode formed on its first principal surface, are bonded together with the resonant electrodes facing each other. A groove is provided on one main surface, and a continuous resonant electrode is formed from the inner surface of the groove to a certain width around the groove, and the inner surface of the groove and/or the resonant electrode around the groove is coated with a conductive bonding material. A stripline resonator characterized in that the stripline resonator is connected via a stripline resonator.