JPH04137602U - stripline resonator - Google Patents

Abstract

(57) [Summary] [Purpose] To easily and reliably connect opposing resonant electrodes in a so-called triplate type stripline resonator in which two dielectric substrates on which resonant electrodes are formed are bonded together. . [Structure] Grooves 2 and 3 having a semicircular cross section are formed on the first main surface of a dielectric substrate 1, and resonant electrodes 4 and 5 are formed on the inner surface of the groove and in a range protruding by a certain width from the inner surface. dielectric substrates are faced and bonded. [Operation] Since the electrodes formed around each groove are in surface contact with each other, the two are reliably connected even if some positional deviation occurs.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is related to a stripline resonator formed by forming resonant electrodes on a dielectric substrate. do.

0002

[Conventional technology]

Traditionally, stripline resonators have been used for bandpass applications in the microwave band, for example. It is used as a type filter. Such a stripline resonator is Usually, they are symmetrical to each other to increase the no-load Q (Qo) and to prevent electromagnetic field leakage. Two dielectric substrates on which related resonant electrodes are formed are bonded together to create a so-called tri-layer structure. It is configured as a plate type.

0003 Figure 6 shows two dielectric substrates that make up a triplate stripline resonator. The structure of In the figure, 1a and 1b are dielectric substrates, respectively. The plate 1a has grooves 2a and 3a, and the dielectric substrate 1b has grooves 2b and 3b. It is being Resonant electrodes indicated by 4a, 5a, 4b, and 5b are formed on the inner surface of these grooves. Input/output electrodes 6a, 7a, 6b, 7b are formed on the surfaces of the dielectric substrates 1a, 1b. each formed. Also, a ground electrode 9a is provided on the back surface of the dielectric substrates 1a and 1b. , 9b are formed on the end face of the dielectric substrate, and a short-circuit end 4 ground electrode of the resonant electrode Ground electrodes 8a and 8b are formed to lead to. In this way, various electrodes are formed. The dielectric substrates are joined together and integrated.

0004 Figure 7 shows a resonant electrode section constructed by bonding two dielectric substrates together. FIG. 3 is a partial cross-sectional view showing the structure. In this example, the resonant electrodes 4a and 4b are connected to form a cylinder. A resonant electrode section having a shape is constructed.

[0005]

[Problem that the idea aims to solve]

As shown in Figures 6 and 7, grooves are provided on the dielectric substrate and the inner surface of the grooves are A stripline resonator formed by forming a resonant electrode has a volume in the resonant electrode part. This makes it possible to increase the no-load Q (Qo) of the resonator. deer However, as shown in Figure 7, in order to electrically connect the upper and lower resonant electrodes, a dielectric High assembly accuracy is required when bonding the body boards together. Also, two facing The two resonant electrodes can only be connected linearly, so in order to completely connect them, After bonding, connect the resonant electrodes by applying a conductive material or plating. There must be.

[0006] The purpose of this invention is to form a strip by forming a resonant electrode on the inner surface of a groove provided in a dielectric substrate. Solving the above-mentioned problems with trip line resonators, it is possible to bond dielectric substrates together. It does not require high assembly precision during assembly, and does not require a special connection process between resonant electrodes. The object of the present invention is to provide a stripline resonator with the following features.

[0007]

[Means to solve the problem]

The stripline resonators according to claim 1 of this invention each have a first main surface that is parallel to the first main surface. Two dielectric substrates on which resonant electrodes are formed are bonded together with the resonant electrodes facing each other. , a groove is provided in the first main surface of one or both of the dielectric substrates, and the inner surface of the groove and the It is characterized in that a continuous resonant electrode is formed in a constant width range around the groove.

[0008] Further, in the stripline resonator according to claim 2, in the above structure, one dielectric The width of the resonant electrode formed on the dielectric substrate is different from the width of the resonant electrode formed on the other dielectric substrate. It is characterized by being wider.

[0009]

[Effect]

In the stripline resonator according to claim 1 of this invention, the first main body of the dielectric substrate is Resonant electrodes are formed on each surface, and at least one of the first dielectric substrates is A groove is provided on the main surface, and the inner surface of the groove and the area around the groove have a certain width. A vibrating electrode is formed continuously. In this way, not only the inner surface of the groove but also the surrounding area. Since the resonant electrode is formed by protruding by a certain width, it cannot be formed on the other dielectric substrate. Since the surfaces face each other with the resonant electrode, it is suitable for bonding dielectric substrates together. Therefore, the resonant electrodes are reliably connected to each other, and a conductive material is used to connect the resonant electrodes. No special processes such as coating or plating are required. In addition, the resonant electrodes are one Since there is surface contact at the parts, even if there is some misalignment when bonding the dielectric substrates, Connected securely.

0010 Further, in the strip line resonator according to claim 2, the strip line resonator may be formed on one dielectric substrate. The width of the resonant electrode formed on the other dielectric substrate is wider than the width of the resonant electrode formed on the other dielectric substrate. Therefore, even if there is some misalignment when bonding two dielectric substrates together, the width Only the opposing position of the narrow resonant electrode relative to the wide resonant electrode is shifted. Besides that Therefore, variations in electrical characteristics can also be suppressed.

[0011]

【Example】

The configuration of the stripline resonator according to the first embodiment before assembly is shown in FIG. . In FIG. 1, 1a and 1b are dielectric substrates, each having a first main surface (see FIG. grooves 2a, 3a, 2b, and 3b are formed on the surface of Resonant electrodes 4a, 5a, 4b, and 5b are formed on the surface, and a certain width extends from the inner surface of each groove. Electrodes 4a', 5a', 4b', and 5b' are formed around each groove. Also Input/output electrodes 6a, 7a, 6b, 7b on the first main surfaces of dielectric substrates 1a, 1b, respectively is formed. Further, on the second main surface (the back surface in the figure) of the dielectric substrates 1a and 1b, form ground electrodes 9a, 9b, and resonance electrodes are formed on the end surfaces of dielectric substrates 1a, 1b. Connect the shorted end of the electrode to the ground electrode on the second main surface and shield the resonator. Ground electrodes 8a and 8b are formed. Symmetrical electrode pattern formed as above For example, silver paste is applied to each electrode portion of two dielectric substrates 1a and 1b having a Then, the resonant electrodes and the input/output electrodes are overlapped so that they face each other, and , the silver paste is baked and bonded. This results in a two-stage bandpass filter. Configure filters. In this example, input and output are connected to two dielectric substrates along with resonant electrodes. Although the electrodes were formed, the input and output electrodes were formed only on one substrate, so that the input and output electrodes were formed only on one substrate. You may also pull out the input and output electrodes.

0012 Figure 2 shows the resonant electrode section constructed by joining the two dielectric substrates shown in Figure 1. FIG. 3 is a partial cross-sectional view showing the structure. In this example, the resonant electrodes 4a and 4b are opposed to each other. By overlapping and bonding two dielectric substrates 1a and 1b, a resonant electrode is created. Parts 4a' and 4b' are in surface contact with each other, and the two are reliably connected.

[0013] In the stripline resonators shown in Figures 1 and 2, the resonator protrudes around the groove. The width of the vibrating electrode was made the same for the two dielectric substrates, but as shown in Figure 3, The width Wa of the resonant electrode formed on one dielectric substrate was formed on the other dielectric substrate. By making the width Wb wider than the width Wb of the resonant electrode, it is possible to bond two dielectric substrates together. Even if there is some misalignment in the position of the narrow resonant electrode, the difference between the narrow resonant electrode and the wide resonant electrode Only the facing position is shifted. Therefore, variations in electrical characteristics can also be suppressed.

[0014] In addition, in the above embodiment, a groove with a semicircular cross section was used as an example, but as shown in FIG. A rectangular groove is formed, and a resonant electric current is applied to the inner surface and a range protruding from the inner surface by a certain width. It may also form a pole.

[0015] Furthermore, in the above embodiment, grooves were formed on the first main surfaces of the two dielectric substrates. However, if a groove is formed only in one dielectric substrate 1a, as shown in FIG. A resonant electrode 10a is formed on the other dielectric substrate 1b, and a resonant electrode 10 is formed on the other dielectric substrate 1b. b may also be formed.

[0016]

[Effect of the idea]

According to this idea, when two dielectric substrates are stacked on top of each other, the resonant electrodes Since there is surface contact in a part of the resonant electrodes, the resonant electrodes are securely connected, and two opposing electrodes Even if a slight positional shift occurs between the resonant electrodes, the connection state will not change. This allows common A strip line with a volume in the vibrating electrode part, which has high Qo and less variation in characteristics. A shaker is obtained.

[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 partial cross-sectional view showing the structure of a resonant electrode section formed by overlapping two dielectric substrates shown in FIG. 1;

FIG. 3 is a partial cross-sectional view showing the structure of a resonant electrode portion of a stripline resonator according to a second embodiment.

FIG. 4 is a partial cross-sectional view showing the structure of a resonant electrode section of a stripline resonator according to a third embodiment.

FIG. 5 is a partial cross-sectional view showing the structure of a resonant electrode portion of a stripline resonator according to a fourth embodiment.

FIG. 6 is an exploded perspective view of a conventional stripline resonator before assembly.

7 is a partial cross-sectional view showing the structure of a resonant electrode section formed by overlapping the two dielectric substrates shown in FIG. 6. FIG.

[Explanation of symbols]

1-Dielectric substrate 2,3-groove 4,5-resonant electrode 6,7-input/output electrode 8- End face ground electrode 9- Earth electrode

Claims (2)

[Scope of utility model registration request] 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. 1. A strip line resonator, characterized in that a groove is provided in one main surface, and a continuous resonant electrode is formed on the inner surface of the groove and within a constant width area around the groove. 2. The strip line resonator according to claim 1, wherein the width of the resonant electrode formed on one dielectric substrate is wider than the width of the resonant electrode formed on the other dielectric substrate.