JPH1098314A - Dielectric resonance component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dielectric resonator reduced in the number of components and superior in packing. SOLUTION: A conductor is formed at the entire surface, including each inner peripheral surface of a dielectric resonator 1 provided with an internal conductor forming hole 4 and a through-hole 7 formed through toward the hole 4 from an external peripheral surface. Then, an electrode at a prescribed place is removed to provide the operation of a coil or a capacitor to the resonator 1. Thereby, the resonator is made reduced in the number of components and low in cost. A notch filter superior in packaging performance is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a dielectric resonance component,
In particular, the present invention relates to a dielectric resonance component in which a capacitor, an inductor, and a dielectric coaxial resonator are formed in a dielectric block.

[0002]

2. Description of the Related Art Conventionally, a notch filter shown in FIG. 4 has been used. As shown in FIG. 4, the notch filter 50 includes four types of independent components: coils 51a and 51b, a capacitor 52, a lead terminal 53, and a dielectric resonator 54. Coil 51a / 51b
Is formed by winding a conductive wire in a cylindrical shape as shown in FIG.

[0003] The capacitor 52 is a single-plate capacitor in which electrodes are formed on upper and lower surfaces of a dielectric having a high dielectric constant, which are paired with each other.

In the dielectric resonator 54, an inner conductor forming hole 55 is formed in a rectangular parallelepiped dielectric block, an inner conductor is formed on an inner peripheral surface of the inner conductor forming hole 55, and a dielectric except for an end face 58 is formed. An outer conductor is formed on the outer peripheral surface of the body block, and one end of the inner conductor is connected to the outer conductor.

Next, how these parts are connected will be described. That is, the dielectric resonator 54
Of the capacitor 52 via a lead terminal 53.
And the other capacitor electrode is joined to the transmission line 56 on the wiring board by a method such as soldering. The transmission line 56 is partially disconnected before and after the capacitor 52, and each of the disconnected portions is a coil 51a.
-Connected by 51b. An outer conductor formed on the outer peripheral surface of the dielectric resonator 54 is connected to a ground electrode 57 on the wiring board.

[0006] The notch filter thus configured is
It works as follows. That is, first, the signal sent to the coil 51a passes through the coil 51a and the capacitor 52 to match the characteristic impedance, and only the signal of a predetermined frequency passes through the lead terminal 53 to the dielectric resonator 54. Sent. The remaining signals are not sent to the dielectric resonator but propagate to the coil 51b. The signal sent to the dielectric resonator is consumed as resonance energy. FIG. 5 is an equivalent circuit showing a notch filter having the configuration shown in FIG.

[0007]

However, in the above conventional example, the coils 51a and 51b, the capacitor 52, and the
3. Since the four types of independent components of the dielectric resonator 54 are used, the number of components is large, the locational restrictions upon mounting are large, and work such as soldering is required to connect the components. There were problems such as an increase in cost.

Accordingly, it is an object of the present invention to provide a dielectric resonator having a small number of parts and excellent in mountability at a low cost.

[0009]

In order to achieve the above object, in a dielectric resonance component according to the present invention, a dielectric block made of a dielectric material and a pair of end faces of the dielectric block are provided. An inner conductor forming hole having an opening and penetrating through the inside of the dielectric block; a coupling inner conductor and a resonator inner conductor formed insulated from each other on an inner peripheral surface of the inner conductor forming hole; An outer conductor formed on the entire outer peripheral surface including both end surfaces of the body block, in contact with the inner conductor for resonator at one end surface of the dielectric block, and an outer conductor formed insulated from the inner conductor for coupling at the other end surface. An input / output electrode formed in a part of the formation region of the outer conductor so as to be insulated from the outer conductor, and formed through the dielectric block from the input / output electrode toward the coupling inner conductor. Through holes, Serial formed in the through hole inner peripheral surface, having, inductance conductor which connects the inner conductor for the input and output electrode coupled.

According to the structure of the present invention, the inductance conductor formed on the through hole functions equivalently as a coil which has conventionally been a separate component. In addition, a capacitance is generated by a conductor non-formed portion between the coupling inner conductor and the resonator inner conductor, and functions as a capacitor. This allows
One dielectric block can be provided with three types of functions of a dielectric resonator, a coil, and a capacitor, so that the number of components can be reduced, and a dielectric resonant component having excellent mountability can be provided. In addition, the work and parts for connecting the parts become unnecessary, which contributes to cost reduction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a dielectric resonance component according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a first embodiment of a dielectric resonator component according to the present invention, and FIG. 2 is a sectional view taken along line XX of FIG. It is sectional drawing. FIG. 3 shows a mounting example of the dielectric resonance component 1 of the present embodiment.

As shown in FIG. 1, the dielectric resonance component 1 is constituted by a rectangular or cylindrical dielectric block 2 made of a ceramic material.

The dielectric block 2 has a pair of end faces 3a.
3b, and the inner conductor forming hole 4 is formed from the end face 3a toward the end face 3b. In the present embodiment, the shape of the inner conductor forming hole 4 is a circular cross section, but is not limited to this shape, and may be an arbitrary shape such as an elliptical shape. Also, a so-called step hole having different inner diameters on the end face 3a side and the end face 3b side may be used.

On the inner conductor forming hole 4, an inner conductor 5a and a coupling inner conductor 5 are sequentially arranged from the end face 3a to the end face 3b.
b, three inner conductors of the resonator inner conductor 5c are formed. Gaps are provided between the inner conductor 5a and the coupling inner conductor 5b, and between the coupling inner conductor 5b and the resonator inner conductor 5c, and are spaced from each other. By changing the width of this interval, the inner conductor 5a and the inner conductor 5 for coupling are changed.
b and the magnitude of the capacitance generated between the coupling inner conductor 5b and the resonator inner conductor 5c can be adjusted. An outer conductor is formed on the entire outer peripheral surface including both end surfaces 3a and 3b of the dielectric block 2. The outer conductor is an inner conductor 5a on the end surface 3a and a resonator inner conductor 5 on the end surface 3b.
c.

Two input / output electrodes 6 are formed in the region where the outer conductor is formed. The input / output electrode 6 is formed insulated from the outer conductor.
Is formed from the mounting surface to the side surface. The reason for the formation from the mounting surface to the side surface is to make it possible to check the soldering state at the time of mounting and to increase the soldering strength. By the way, in this embodiment, the input / output electrode 6
Is formed over the mounting surface and the side surface, but the input / output electrode may be formed at any position without being limited thereto.
In FIG. 1, the mounting surface is shown as the upper surface of the drawing for easy understanding of the shape of the input / output electrode 6.

As shown in FIG. 2, through holes 7 are formed through the dielectric block 2 from the two input / output electrodes 6 toward the coupling inner conductor 5b. At this time, the two through holes 7 formed are formed so as to form symmetrical angles with respect to a perpendicular passing through the center of the inner conductor forming hole 4 and standing on the mounting surface when viewed from the axial direction of the inner conductor forming hole 4. I do. With such a configuration, the filter characteristics of the notch filter can be improved. On the inner peripheral surface of the through hole 7, an inductance conductor 8 for electrically connecting the coupling inner conductor 5b and the input / output electrode 6 is formed. The through hole 7 has an opening on the side surface side, not on the mounting surface side of the input / output electrode 6. By doing so, it becomes possible to trim the inductance conductor 8 formed on the inner peripheral surface of the through hole 7 even after the mounting of the dielectric block 2, and the inductance value can be adjusted. In addition, the adjustment of the inductance value is also possible by changing the size of the through hole 7. In the present embodiment, the shape of the through hole 7 is circular in cross section and its central axis is a straight line. However, the shape of the through hole 7 may be any shape, for example, an elliptical or square cross sectional shape. There may be. Further, the central axis of the through hole 7 may be a meandering curve. Although it is difficult to perform trimming after mounting, the opening of the through hole 7 on the input / output electrode side may be formed on the mounting surface of the dielectric block. Further, in this embodiment, in order to enhance the filter characteristics, the through-hole 7 is formed so as to form a symmetrical angle with respect to a perpendicular line drawn from the center axis of the inner conductor forming hole 4 to the mounting surface. Through hole 7 at any angle
May be formed.

The outer conductor, the inner conductor 5a, the coupling inner conductor 5b, the resonator inner conductor 5c, the input / output electrode 6, and the inductance conductor 8 are made of a highly conductive electrode material such as copper by means of electroless plating. After applying to the entire surface including each inner peripheral surface of the dielectric block 2, the dielectric block 2 is formed by a method such as performing an etching process on a necessary portion.

The notch filter configured as described above operates as follows. That is, the signal sent to one input / output electrode 6 is sent to the inductance conductor 8 formed on the inner peripheral surface of the through hole 7. In that case, the inductance conductor 8 acts equivalently as a coil. Next, the signal passing through the inductance conductor 8 is sent to the coupling inner conductor 5b. At this time, a capacitance is generated by the conductor non-formed portion provided between the inner conductor 5a and the coupling inner conductor 5b, and between the coupling inner conductor 5b and the resonator inner conductor 5c, and acts as a capacitor. The characteristic impedance of the signal can be matched by the action as the coil and the action as the capacitor. The matched signal of a predetermined frequency causes a resonance phenomenon and is consumed as resonance energy. The remaining signal passes through the dielectric resonator 1 and is sent out from the other input / output electrode 6.

The dielectric resonance component according to the present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the invention. For example, in the present embodiment, the inner conductor 5a is disposed on the inner peripheral surface of the inner conductor forming hole 4 in contact with the outer conductor on the end face 3a in order to prevent leakage of the magnetic field component. do not have to.

[0021]

As described above, according to the dielectric resonance component of the present invention, the function of the inductance conductor formed in the dielectric block as a coil is changed by the connection inner conductor 5b.
A portion of the conductor-free portion between the inner conductor 5c and the resonator inner conductor 5c can have a function as a capacitor, so that there is no need to separately provide a coil, a capacitor, and a lead terminal for impedance matching. Thus, the number of components for configuring the notch filter can be reduced, and a notch filter with excellent mountability can be provided. Further, since the number of parts is reduced, the probability of failure of the whole set is reduced, and the reliability is improved. Further, the connection work between the components is not required, and the dielectric resonance component having the notch filter function can be formed only by the etching process.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a dielectric resonance component according to the present invention.

FIG. 2 is a sectional view showing a first embodiment of the dielectric resonance component according to the present invention.

FIG. 3 is a perspective view showing a mounting example of the first embodiment of the dielectric resonance component according to the present invention.

FIG. 4 is a perspective view showing the configuration of a conventional notch filter.

FIG. 5 is an equivalent circuit showing a configuration of a conventional notch filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dielectric resonance component 2 Dielectric block 3a, 3b End face of dielectric block 4 Inner conductor forming hole 5a Inner conductor 5b Coupling inner conductor 5c Resonator inner conductor 6 Input / output electrode 7 Through hole 8 Inductance conductor 9 Conductor non-formed portion DESCRIPTION OF SYMBOLS 11 Earth electrode 12 Transmission line 51a, 51b Coil 52 Capacitor 53 Lead terminal 54 Dielectric resonator 55 Inner conductor formation hole 56 Transmission line 57 Earth electrode 58

Claims (1)

[Claims] A dielectric block formed of a dielectric material; an inner conductor forming hole having an opening at a pair of end faces of the dielectric block and penetrating through the inside of the dielectric block; A coupling inner conductor and a resonator inner conductor formed insulated from each other on an inner peripheral surface of the inner conductor forming hole, and formed on the entire outer peripheral surface including both end surfaces of the dielectric block; At the end face, the outer conductor is in contact with the resonator inner conductor, and at the other end face, the outer conductor is formed insulated from the coupling inner conductor, and is formed in a part of the outer conductor formation region insulated from the outer conductor. And a through-hole formed through the dielectric block from the input-output electrode toward the coupling inner conductor; and an input-output electrode formed on the inner peripheral surface of the through-hole. Connects to the coupling inner conductor Dielectric resonant component and having a inductance conductor, a.