JPH056902U - Stripline resonator - Google Patents

Abstract

(57) [Abstract] [Purpose] In a triplate-type stripline resonator in which two dielectric substrates each having a resonance electrode formed in a groove are joined, it is ensured that the dielectric substrates and the resonance electrodes are joined. Also, it facilitates the handling of the dielectric substrate. [Structure] Grooves 2a, 3a, 2b, 3b each having a chamfered or rounded edge are formed on a first main surface of a dielectric substrate 1a, 1b, and resonance electrodes 4a, 5 are formed on inner surfaces of these grooves.
a, 4b, and 5b are respectively formed, and the resonance electrodes are bonded to each other through a conductive bonding material. The conductive bonding material that bonds the resonance electrodes together collects in the chamfered portion or the rounded portion formed on the edge of the groove, and the two are reliably bonded. Further, the impact resistance of the groove edge portion is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stripline resonator formed by forming a resonance electrode on a dielectric substrate.

[0002]

[Prior Art]

 A stripline resonator generally has a resonance electrode formed on the first main surface of a dielectric substrate and a ground electrode formed on the second main surface, in order to reduce conduction loss and electromagnetic field leakage in particular. In addition, two dielectric substrates each having a resonance electrode formed thereon are opposed to each other and bonded to each other to form a so-called triplate-type stripline resonator. Further, in order to increase the unloaded Q (Qo) of the resonator, a groove is formed on the first main surface of the dielectric substrate and a resonance electrode is formed on the inner surface of the groove.

FIG. 5 shows the structure of two dielectric substrates that constitute a grooved triplate-type stripline resonator. In FIG. 5, 1a and 1b are dielectric substrates, and grooves 1a and 3a are formed on the first main surface (lower surface in the figure) of the dielectric substrate 1a. Two grooves 2b and 3b are formed on the main surface (upper surface in the figure). Resonance electrodes 4a, 5a, 4b and 5b are formed on the inner surfaces of these grooves, respectively, and input / output electrodes 6 and 7 are formed from the first main surface to the side surface of the dielectric substrate 1a. Has been done. Further, a ground electrode is formed from the second main surface to the side surface of both dielectric substrates. A stripline resonator is formed by integrally bonding the dielectric substrates 1a and 1b on which various electrodes are formed in this manner with their resonance electrodes facing each other.

[0004]

[Problems to be solved by the device]

 However, in a strip line resonator using a dielectric substrate with a groove formed on the main surface in this way, the edges formed around the groove during handling in a single state before joining the dielectric substrates. There was a risk that a part of the edge would be chipped off due to foreign matter coming into contact with. Here, a side view of the two dielectric substrates shown in FIG. 5 before electrode formation is shown in FIG. 6, and a side view after electrode formation is shown in FIG. During the handling of the dielectric substrate, as shown in FIG. 6, chipping as shown by B occurs in the groove 3b formed in the dielectric substrate 1b. When chipping occurs at the edge of the groove in this way, there is a problem that the pattern of the resonance electrode changes and the characteristics change. Also, when a conductive bonding material such as silver paste is applied to the inner surface of the groove and the edge portion of the groove, as shown in FIG. When bonding the body substrates 1a and 1b, the conductive bonding materials are not reliably bonded to each other. As a result, there is a problem that the reliability of the joint surface is low and stable characteristics cannot be obtained.

An object of the present invention is to solve the above-mentioned problems and to provide a highly reliable stripline resonator with less variation in characteristics.

[0006]

[Means for Solving the Problems]

 This invention is a stripline resonator in which two dielectric substrates each having a resonance electrode formed on a first main surface are joined so that the resonance electrodes face each other, and a chamfered portion or a rounded portion is formed at the edge. A groove is provided on the first main surface of one or both of the dielectric substrates, and a resonance electrode is formed on the inner surface of the groove.

[0007]

[Action]

 In the stripline resonator of the invention, a groove having a chamfered portion or a rounded edge is provided on the first main surface of one or both of the dielectric substrates, and the resonance electrode is formed on the inner surface of the groove. .. Since the chamfered portion or the rounded portion is formed on the edge of the groove in this way, even when a foreign object comes into contact with the edge of the groove, the stress due to the contact is dispersed and the edge of the groove is less likely to be cut. In addition, when two dielectric substrates are bonded together, a conductive bonding material such as silver paste accumulates in the chamfered portion or the rounded portion formed on the edge of the groove, so that the resonance electrodes are surely brought into contact with each other. The desired characteristics are obtained.

[0008]

【Example】

 FIG. 1 shows a configuration before assembly of a stripline resonator according to an embodiment of the present invention. In FIG. 1, reference numerals 1a and 1b are dielectric substrates, and two grooves indicated by 2a and 3a are formed on the first main surface (lower surface in the figure) of the dielectric substrate 1a. Two grooves 2b and 3b are formed on one main surface (upper surface in the figure). As shown in the figure, the edges of these four grooves are rounded. Resonant electrodes 4a and 5a are formed on the inner surfaces of the grooves 2a and 3a on the dielectric substrate 1a side, and resonant electrodes 4b and 5b are formed on the inner surfaces of the grooves 2b and 3b on the dielectric substrate 1b side. is doing. Further, the input / output electrodes 6 and 7 are formed from the first main surface of the dielectric substrate 1a to the side surface thereof, and further to the second main surface side. Except for the input / output electrode forming portion, the ground electrodes 8 are formed on the four side surfaces of the dielectric substrate 1a and the second main surface (upper surface in the figure), and the input / output electrodes 6 are also formed on the dielectric substrate 1b side. , 7, the ground electrode 9 is formed on the four side surfaces and the second main surface (the lower surface in the figure).

An insulating bonding material such as glass frit is applied to the electrode non-forming portion of the bonding surface of the two dielectric substrates having various electrode patterns as described above, and a silver paste or the like is applied to the resonance electrode forming portion. Apply the conductive bonding material of No. 2 to bond the two dielectric substrates, and if necessary, apply the conductive bonding material such as silver paste to the ground electrode formation part on the four sides of the laminated body and dry. After baking. This constitutes a triplate-type stripline resonator as shown in FIG. In this example, the edge portion of the second main surface of the dielectric substrate 1a is also rounded in advance. In FIG. 2, the upper surface is the mounting surface for the printed wiring board, and the input / output electrodes 6, 7 and the ground electrode 8 are joined to the electrodes formed on the printed wiring board by soldering or the like.

Next, FIG. 3 shows a sectional structure of the completed stripline resonator and a mounting state on a printed circuit board. By preliminarily rounding the edges of the grooves formed on the dielectric substrates 1a and 1b in this manner, the conductive bonding material that bonds the resonance electrodes together is accumulated in the roundness forming part of the grooves, so that the conductivity at the bonding surface is improved. The protrusion of the bonding material is reduced, and the two dielectric substrates and the resonance electrodes are reliably bonded to each other. Further, in this embodiment, since the edge portion of the mounting surface of the dielectric substrate 1a with respect to the printed wiring board 10 is also rounded, a protruding portion due to the accumulation of the conductive bonding material is not formed at the edge portion. Lifting of the stripline resonator from the printed wiring board is also prevented, and the stripline resonator is reliably mounted on the printed wiring board.

Although the above-described embodiment is an example in which the edges of the groove to be provided in the dielectric substrate are rounded, the same effect can be obtained even if chamfering is performed as shown in FIG. 4, for example. Be done.

Although the embodiment of the present invention takes the two-stage interdigital stripline resonator as an example, it goes without saying that the invention can be similarly applied to the combline type.

Further, in the embodiment, two grooves are formed on each of the two dielectric substrates, but one resonance electrode is provided on a flat surface, and a resonance electrode formed on the inner surface of the groove with respect to this resonance electrode. You may make it join.

[0014]

[Effect of the device]

 According to this invention, since the chamfered portion or the rounded portion is formed on the edge of the groove provided on the dielectric substrate, the conductive bonding material that joins the resonance electrodes is accumulated at the chamfered portion or the rounded portion. It is possible to reliably bond the two dielectric substrates and the resonance electrodes formed therein without forming the protruding portion of the conductive coupling material at the edge of the groove. Further, it is possible to prevent chipping of the edge portion of the groove during handling of the dielectric substrate alone. Due to these effects, a highly reliable stripline resonator with little characteristic variation can be obtained.

[Brief description of drawings]

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

FIG. 2 is a perspective view of the stripline resonator after assembly.

FIG. 3 is a diagram showing a cross-sectional structure of a stripline resonator and a mounting state on a printed wiring board.

FIG. 4 is a diagram showing a cross-sectional structure of a stripline resonator according to another example and a mounting state on a printed wiring board.

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

FIG. 6 is a side view of a dielectric substrate used in a conventional stripline resonator.

FIG. 7 is a side view of a dielectric substrate after forming electrodes in a conventional stripline resonator.

Claims (1)

[Claims for utility model registration] 1. A stripline resonator comprising two dielectric substrates, each having a resonance electrode formed on a first main surface thereof, facing each other and joined together. A stripline resonator characterized in that a groove having a chamfered portion or a rounded shape is provided on the first main surface of one or both of the dielectric substrates, and a resonance electrode is formed on the inner surface of the groove.