JPS62251Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a stripline resonator.
In particular, the present invention relates to a stripline resonator in which a linear electrode is formed on one side of a dielectric substrate and a full-surface electrode is formed on the other side.

A coaxial dielectric resonator has good performance as a high frequency resonator. However, since coaxial dielectric resonators have poor productivity, stripline resonators, which have a simple structure and good productivity, are often used instead. However, this stripline resonator had a problem because its Q was smaller than that of a coaxial dielectric resonator.

FIG. 1 is a perspective view of a conventional stripline resonator. In the configuration, a linear electrode 2 extending linearly is formed on one side of a dielectric substrate 1,
A full-surface electrode 3 is formed on the other side of the dielectric substrate 1. In such a resonator, the linear electrode 2
The resonant frequency o is determined by the length L of . That is, by increasing the length L of the linear electrode 2, its inductance increases and the resonant frequency o can be increased.

By the way, in the stripline resonator as described above, if the cross-sectional area of the longitudinal cross section of the linear electrode 2 is increased, the current density flowing through the surface of the linear electrode 2 becomes smaller, and Q can be increased. can. However, the thickness of the linear electrode 2 cannot be changed much.
Therefore, it is conceivable to widen the width direction of the linear electrode 2, but if it is simply widened, the external dimensions will become large. It is also subject to restrictions from the characteristics standpoint.
As described above, it has been difficult to obtain as large a Q as a coaxial dielectric resonator with the conventional stripline resonator.

Therefore, the main objective of this invention is to provide a resonator with a higher Q than conventional stripline resonators without increasing the external dimensions.

In summary, the idea is to form a groove on one side of a dielectric substrate and form a linear electrode on the entire inner surface of the groove, thereby increasing the cross-sectional area of the linear electrode without increasing the external dimensions. This is designed to increase Q to improve Q.

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

FIG. 2 is a perspective view showing an embodiment of this invention. In the structure, a groove 4 having a concave cross section is formed on one side of the dielectric substrate 11. A linear electrode 21 is formed on the entire inner surface of the groove 4.

As shown in FIG. 1, in a conventional stripline resonator, a linear electrode 2 is formed in a planar manner on one side of a dielectric substrate 1. Therefore, the length W in the width direction of the linear electrode 2 is as follows. Dielectric substrate 1 occupied by this linear electrode 2
is equal to the length in the width direction. On the other hand, in the embodiment shown in FIG. 2, the length of the linear electrode 21 in the width direction when unfolded is longer than the length of the groove 4 in the width direction. That is, the embodiment shown in FIG. 2 can form a linear electrode having a wider width than the conventional stripline resonator without changing the length occupied in the width direction of the dielectric substrate. Therefore, a wide linear electrode can be formed without increasing the external dimensions compared to conventional ones, and Q can be increased.

In FIG. 2, the grooves 4 having a concave cross section are formed on one side of the dielectric substrate 11, but the grooves 4 may have other shapes in cross section.

FIG. 3 is a perspective view showing another embodiment of this invention. In FIG. 3, a groove 41 having an arcuate cross section is formed on one side of the dielectric substrate 12.
A linear electrode 22 is formed on the entire inner surface of 1.

FIG. 4 is a perspective view showing still another embodiment of this invention. In FIG. 4, a groove 4 having a concave cross section is formed on one side of a dielectric substrate 11, and a linear electrode 21 is formed on the entire inner surface of the groove 4, as in the embodiment shown in FIG. However, the entire surface electrode 31 formed on the other side of the dielectric substrate 11
It is formed to extend to both sides of the As a result, the length of the dielectric substrate 11 in the width direction required for the length of the entire surface electrode in the width direction can be saved, and the external dimensions can be further reduced. Note that, in view of the characteristics, it is preferable that L1≈L2 in FIG. 4.

Note that a stripline filter can also be constructed using a stripline resonator as described above, and this invention can also be applied to such a stripline filter.

As described above, according to this invention, a groove is formed on one side of the dielectric substrate, and a linear electrode is formed on the entire inner surface of the groove, so the Q can be increased without increasing the external dimensions. You can improve your performance.
Therefore, it is possible to obtain a stripline resonator having the same size as the conventional one and having performance comparable to a so-called coaxial dielectric resonator.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional stripline resonator. FIG. 2 is a perspective view showing an embodiment of this invention. FIG. 3 is a perspective view showing another embodiment of this invention. FIG. 4 is a perspective view showing still another embodiment of this invention. In the figure, 1, 11 and 12... dielectric substrate, 2, 21 and 22... linear electrode, 3 and 31... whole surface electrode, 4 and 41... groove.

Claims (1)

[Claims for Utility Model Registration] A stripline resonator including a dielectric substrate, a linear electrode formed on one side of the dielectric substrate, and a full-surface electrode formed on the other side of the dielectric substrate. In the stripline resonator, grooves are formed in the dielectric substrate, and the linear electrodes are formed on the entire inner surface of the grooves, thereby increasing the area of the linear electrodes.