JPH1051212A - Dielectric resonator and electronic unit using the resonator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the capacitance value of every dielectric resonator in a mass production mode and at an intensive field part of the resonator by reducing the width of an input/output electrode of the resonator at the open end face side, compared with the short-circuit end face side. SOLUTION: A dielectric block 4 made of a high dielectric material for a dielectric resonator is coated with a silver or copper electrode on its entire circumferential surface, and an outer circumference electrode 5, an inner circumference electrode 6 and a short-circuit electrode are formed en bloc. Then the electrode is polished at one of both end sides of a through-hole 3, so that the block 4 is exposed as an open end face 1. Furthermore, the electrode is polished on one of both side faces of the block 4, so that the block 4 is exposed. An input/output electrode 7 and the electrode 5 are printed on this exposed surface of the block 4. The electrode 7 has its width reduced at the side of the face 1, compared with the side of a short-circuited end face 2. As a result, the area of the electrode 7 is reduced at an intensive field part of the resonator, and therefore the variance in the notch capacity caused by the printing of the electrode 7 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator used for various communication devices and an electronic device using the same.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional dielectric resonator has a prism-shaped dielectric block 4 having a through hole 3 extending from an open end face 1 to a short-circuit end face 2;
Outer electrode 5 provided on the outer peripheral side surface, inner peripheral electrode 6 provided on the inner peripheral surface of through hole 3, and short-circuit electrode provided on short-circuit end face 2 and short-circuiting inner peripheral electrode 6 and outer peripheral electrode 5. (Not shown), and an island-shaped input / output electrode 7 provided on the open end face 1 side of the outer peripheral electrode 5 and separated from the outer peripheral electrode 5.

In the dielectric resonator configured as described above, the notch capacitance connected in series to the resonance circuit is formed by opposing the inner peripheral electrode 6 and the input / output electrode 7 with the dielectric block 4 interposed therebetween. Was.

[0004]

However, in the dielectric resonator configured as described above, the electric field on the open end face 1 side of the dielectric block 4 is strong, and the notch capacitance is larger depending on the size and position of the input / output electrode 7. There is a problem that the characteristics of individual dielectric resonators during mass production are difficult to stabilize.

Therefore, the present invention solves such a problem,
An object of the present invention is to stabilize the characteristics of individual dielectric resonators during mass production.

[0006]

In order to achieve this object, the present invention provides an input / output electrode provided on a dielectric resonator.
The width on the open end face side is smaller than that on the short-circuit end face side.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention is a prismatic dielectric block having a through hole extending from an open end face to a short-circuit end face, and provided on the outer peripheral side face of the dielectric block. An outer electrode, an inner electrode provided in the through-hole, a short-circuit electrode provided on the short-circuit end face and short-circuiting the inner electrode and the outer electrode, and provided on an open end side of the outer electrode. This outer peripheral electrode is composed of a separated island-shaped input / output electrode, and the input / output electrode is a dielectric resonator characterized in that the width of the open end face is narrower than that of the short-circuit end face. Narrowing the electrode width on the open end face side of the electrode has the effect of reducing coupling on the open end face side where electric field coupling is strong.

According to a second aspect of the present invention, the input / output electrodes are
2. The dielectric resonator according to claim 1, wherein the width of the dielectric resonator is gradually reduced from the short-circuit end face to the open end face. Has the effect that it can be continuously reduced.

According to a third aspect of the present invention, the input / output electrode comprises:
A capacitor forming section formed on the short-circuit end face side, an external connection section formed on the open end face side, and a connection section connecting the capacity forming section and the external connection section; and a width of an electrode of the external connection section 2. The dielectric resonator according to claim 1, wherein the width is smaller than the width of the electrode of the capacitance forming portion and wider than the width of the electrode of the connection portion. Has the effect of being able to reduce the number of bonds.

According to a fourth aspect of the present invention, there is provided the dielectric resonator according to the third aspect, wherein a plurality of external connection portions are provided for the capacitance forming portion formed on the input / output electrodes. In addition, there is an effect that reliability in external connection can be improved.

According to a fifth aspect of the present invention, the connecting portion formed on the input / output electrode is provided at an end on one side surface of the dielectric resonator. Wherein the coupling with the inner peripheral electrode at the connection portion can be reduced.

According to a sixth aspect of the present invention, there is provided a mounting substrate having a circuit configuration electrode and a ground electrode, and an outer peripheral electrode connected to the ground electrode and mounted on the substrate and connected to the circuit configuration electrode. 6. An electronic apparatus comprising: the dielectric resonator according to claim 1, wherein the input / output electrode comprises a non-electrode. An electronic device characterized by being formed as a forming portion, and has an effect that a stray capacitance formed by an input / output electrode and a ground electrode can be reduced.

An embodiment of the present invention will be described below with reference to the drawings. The components having the same configuration as the above-described conventional technology are denoted by the same reference numerals, and description thereof will be simplified.

As shown in FIG. 1, the dielectric resonator has a dielectric block 4 made of a high dielectric constant material (Er = 30 to 100) made of a barium titanate-based ceramic or the like. The electrodes are covered to form an outer electrode 5, an inner electrode 6, and a short-circuit electrode (not shown) in a lump. Next, the electrode on one end of the through hole 3 is polished to expose the dielectric block 4 and open the end face 1. To form Further, the electrodes on one side of the dielectric block 4 are polished to expose the dielectric block 4, and the input / output electrodes 7 and the outer peripheral electrodes 5 are printed on the exposed surface.

The shape of the input / output electrode 7 is the short-circuit end face 2.
The width on the open end face 1 side is smaller than that on the open side. This is because, since the area of the input / output electrode 7 in the portion where the electric field of the dielectric resonator is strong is small, the variation in the notch capacitance generated when the input / output electrode 7 is printed can be reduced, and the printing accuracy can be reduced. Even without raising, the characteristics of the dielectric resonator are stabilized.

The input / output electrode 7 has a substantially trapezoidal shape. Thus, the width of the input / output electrode 7 is gradually reduced from the short-circuit end face 2 toward the open end face 1 so that the inner peripheral electrode 6 and the input / output electrode 7 are separated. The formed notch capacitance decreases continuously from the short-circuit end face 2 side to the open end face 1 side, so that the variation due to printing can be further reduced.

FIG. 2 shows an electronic apparatus in which the above-described dielectric resonator is mounted on a mounting substrate 8 and used.

Reference numeral 8 denotes a mounting substrate, which is obtained by etching a surface of a substrate 8a formed of a glass epoxy resin and coating the surface of the substrate 8a with an electrode such as copper to form a ground electrode 9, a circuit constituting electrode 10, and a non-electrode. An electrode protection film (not shown) made of an insulating material is provided on a portion other than a connection portion with a dielectric resonator to be described later, and a conductive adhesive such as solder used for mounting is formed. The short circuit between the electrodes due to the flow is prevented. For the purpose of enhancing the shielding performance of the electronic device, a shield electrode (not shown) is provided on substantially the entire back surface of the mounting substrate 8, and is connected to a ground electrode 9 provided on the front surface through a through hole 12. ing.

When a dielectric resonator is mounted on such a mounting substrate 8, the connection portion 1 between the input / output electrode 7 and the circuit configuration electrode is used.
0a, the outer peripheral electrode 5 and the ground electrode 9 are connected to each other using a conductive adhesive such as solder.

At this time, the portion of the earth electrode 9 facing the input / output electrode 7 of the dielectric resonator is formed as the non-electrode forming portion 11 so that the input / output electrode 7 is connected to the earth electrode 9 via the electrode protection film. The stray capacitance formed by the above is suppressed, and it can be used without deteriorating the characteristics of the dielectric resonator.

In another embodiment of the dielectric resonator, as shown in FIG. 3, the input / output electrodes 7 provided on the dielectric block 4 are arranged in the order from the open end face 1 side to the short-circuit end face 2 side.
An external connection portion 7a for connecting to an external circuit such as a mounting board; a connection portion 7c for electrically connecting the external connection portion 7a to a capacitance forming portion 7b described later; The external connection portion 7a has a narrower electrode width than the electrode width of the capacitance formation portion 7b, and has a connection portion 7c. Is set wider than the electrode width. This stabilizes the characteristics of the dielectric resonator as in the above-described embodiment.

Further, by making the electrode width of the external connection portion 7a and the connection portion 7c narrower than that of the capacitance forming portion 7b, the exposed portion of the dielectric block 4 is increased around the portion. By providing the dielectric resonator 5a, the shielding property of the dielectric resonator is enhanced, and the coupling between the outer peripheral electrode 5a and the inner peripheral electrode 6 on the open end face 1 side of the dielectric resonator is added. The compression effect is produced, and the size of the dielectric resonator can be reduced.

When such a dielectric resonator is mounted on a mounting board 8 as shown in FIG.
a ground electrode 9a is provided on a portion of the mounting substrate 8 corresponding to the shield electrode (not shown) provided on the back surface of the mounting substrate 8 through the through hole 12.
Connected to

As a result, the outer peripheral electrode 5a on the open end face 1 side of the dielectric resonator having a high potential is connected to the ground electrode 9a, so that the ground of the dielectric resonator is strengthened and the mounting substrate 8 is mounted. The characteristics of the dielectric resonator mounted on the device can be effectively used.

3 and 4, the connecting portion 7c
The external connection portion 7a is provided at a portion facing the through hole 3, but if provided at an end on one side surface of the dielectric resonator, the external connection portion 7a and the connection portion 7c are provided at the through hole 3. It is possible to reduce the coupling with the inner electrode 6,
The role of each portion 7a, 7b, 7c of the inner peripheral electrode 6 becomes clear.

In still another embodiment, as shown in FIG.
In one capacitance forming portion 7b provided in the dielectric resonator, two external connection portions 7a are provided and the connection portion 7b is provided.
c is provided at the end of the dielectric resonator.

In mounting such a dielectric resonator, as shown in FIG. 6, the connection portion 10a of the circuit configuration electrode 10 provided on the mounting substrate 8 is connected to the external connection portion for each dielectric resonator. Two are provided so as to correspond to 7a. By increasing the number of connection points of the input / output electrode 7 in one dielectric resonator in this way, it is possible to reduce poor connection and the like at the time of mounting due to solder or the like.

Further, different external connection portions 7a and connection portions 7
A ground electrode 5a is provided between the terminals c, and has the same effect as the other embodiments described above.

[0029]

As described above, according to the present invention, the width of the input / output electrodes of the dielectric resonator is made narrower on the open end face side than on the short-circuit end face side, so that a portion where the electric field is strong in the dielectric resonator is provided. Thus, the capacitance value of each dielectric resonator during mass production can be stabilized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a dielectric resonator according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an electronic device on which the dielectric resonator is mounted.

FIG. 3 is a perspective view of a dielectric resonator according to another embodiment of the present invention.

FIG. 4 is an exploded perspective view of an electronic device on which the dielectric resonator is mounted.

FIG. 5 is a perspective view of a dielectric resonator according to still another embodiment of the present invention.

FIG. 6 is an exploded perspective view of an electronic device on which the dielectric resonator is mounted.

FIG. 7 is a perspective view of a conventional dielectric resonator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Open end surface 2 Short-circuit end surface 3 Through hole 4 Dielectric block 5 Outer electrode 6 Inner electrode 7 I / O electrode

Claims (6)

[Claims] 1. A prismatic dielectric block having a through hole extending from an open end surface to a short-circuit end surface, an outer peripheral electrode provided on an outer peripheral side surface of the dielectric block, and an inner periphery provided in the through hole. An electrode, a short-circuit electrode provided on the short-circuit end face and short-circuiting the inner electrode and the outer electrode, and an island-shaped input / output electrode provided on the open end side of the outer electrode and separated from the outer electrode Wherein the width of the input / output electrode is smaller on the open end face side than on the short-circuit end face side. 2. The dielectric resonator according to claim 1, wherein the width of the input / output electrode is gradually reduced from the short-circuit end face to the open end face. 3. An input / output electrode comprising: a capacitor forming portion formed on a short-circuit end face side; an external connection portion formed on an open end face side;
The capacitor is formed of a connection portion that connects the capacitance formation portion and an external connection portion, and the width of the electrode of the external connection portion is set smaller than the width of the electrode of the capacitance formation portion and wider than the width of the electrode of the connection portion. The dielectric resonator according to claim 1, wherein: 4. The dielectric resonator according to claim 3, wherein a plurality of external connection portions are provided for the capacitance forming portion formed on the input / output electrode. 5. The dielectric resonator according to claim 3, wherein the connection portion formed on the input / output electrode is provided at an end on one side surface of the dielectric resonator. . 6. A mounting substrate provided with a circuit configuration electrode and a ground electrode, an outer peripheral electrode mounted on the substrate and connected to the ground electrode, and an input / output electrode connected to the circuit configuration electrode. 6. An electronic device comprising the dielectric resonator according to claim 1, wherein the ground electrode portion facing the input / output electrode is a non-electrode forming portion. Electronic equipment.