JP2002111329A - Dielectric resonator and filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a loss in a dielectric resonator and a filter. SOLUTION: Spurious radiation generated by discontinued impedance at a connecting part of the resonator, an input/output electrode 13 of the filter and a conductor line 12 on a print-circuit board 10 is shielded by a metal piece 16 or the like to reduce a leakage and a loss.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a small-sized dielectric resonator and a filter suitable for use in a high frequency band of 3 GHz or more, and more particularly to a connection structure between an input / output electrode and an external circuit. Things.

[0002]

2. Description of the Related Art With the spread of mobile communication devices, communication systems and devices using frequencies higher than the currently used frequency band of 3 GHz or less have been developed. In order to cope with the high frequency, the components used must also cope with the high frequency. As resonators used in mobile communication devices of about 3 GHz or less, dielectric resonators, surface wave resonators, multilayer resonators, and the like have been put to practical use.

[0003] In the field of dielectric resonators, resonators utilizing dielectric coaxial resonators are widely used. Its dimensions are constrained by frequency and dielectric constant, the higher the frequency the shorter the dimensions. Accordingly, it is difficult to obtain the coupling capacity of the input and output, and it is also difficult to obtain a high Q.

The inventor of the present invention employs a completely new structure, forms island-shaped input / output electrodes on the surface of a rectangular parallelepiped dielectric to form a resonator, and connects these resonators to form a dielectric. It is proposed to construct a filter. There are several types of this, but Japanese Patent Application Nos. 10-277749 and 10-30.
In 2331, a type was proposed in which a dielectric substrate was stacked to obtain coupling and input / output electrodes were formed on both end faces to reduce the size and increase the frequency.

[0005]

This type of dielectric filter / resonator is connected to a microstrip line or a coplanar line on an insulating substrate. However, in the high frequency region of 10 GHz or more, simply connecting the input / output electrodes directly to the signal line disturbs the characteristic impedance at the discontinuous portion of the joint, causing unnecessary radiation and increasing the loss. This makes it difficult to obtain good electrical characteristics.
The present invention provides a structure that can reduce the loss at the connection between the dielectric resonator and the filter of this type.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by covering a joint between an input / output electrode and a conductor line with a conductor.

That is, in a dielectric resonator having an input / output electrode and a ground electrode in a dielectric, one of the rectangular parallelepiped dielectrics is used.
An input / output electrode made of an island-shaped conductor film is provided on the surface, and almost all of the remaining surface on which the input / output electrode is formed by being insulated and separated from the input / output electrode and a conductor film formed on the other surface of the dielectric A ground electrode is provided, and a dielectric is inserted into a hole of an insulating substrate provided with a conductor line on the surface to be connected to the input / output electrode, and the input / output electrode is connected to the conductor line of the insulating substrate. The present invention is characterized in that a conductor is provided which surrounds and covers a connection between the conductor line and the input / output electrode, and is insulated from the input / output electrode and the conductor line and connected to the ground conductor.

[0008] A dielectric filter having an input electrode and an output electrode separately is characterized in that it has conductors that respectively cover the input electrode and the output electrode.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Input / output electrodes of a dielectric resonator / filter are arranged on the surface of a dielectric. This input / output electrode
It is connected to a wiring pattern formed on the surface of the insulating substrate and extending to the edge of the hole. The same applies to the ground conductor. The exposed portions of the input / output electrodes and the surrounding dielectric, and the conductor lines and the surrounding portions are shielded by the conductor, so that unnecessary radiation can be prevented.

As the shielding conductor, a metal plate or a dielectric formed with a metal film can be used, and any shape can be adopted as long as it does not come in contact with the input / output electrodes and the conductor lines. If the distance between the conductor line and the insulating substrate on the far side from the input / output electrodes is reduced, the shielding effect can be improved.

[0011]

Embodiments of the present invention will be described below. FIG. 1 is a perspective view showing an embodiment of the present invention, and shows a state after a dielectric resonator 11 has been inserted into an insulating substrate 10. The dielectric resonator 10 has an island-shaped input / output electrode 1 on one surface of a rectangular parallelepiped dielectric.
3 and an earth electrode 14 surrounding it are formed. The ground electrode is also formed on the entire other surface.

The input / output electrode 13 is connected to the conductor line 12 on the insulating substrate 10. Although not shown, the earth electrode of the dielectric resonator and the earth electrode of the insulating substrate are also connected. In the present invention, a U-shaped metal piece 16 is attached to the input / output electrode 13 and the conductor line 12. This metal piece 16 is
And covers the input / output electrode side of the conductor line 12. The metal piece 16 can be fixed by soldering or the like at the same time as the connection between the input / output electrode 13 and the conductor line 12.

FIG. 2 shows an example in which the shape of the metal piece 26 is changed. The shape of the metal piece 26 is tapered to reduce the leakage of the electromagnetic field. FIG. 3 shows an example in which a shielding means in which a conductor film is formed on the surface of a U-shaped dielectric 37 is used.

The dielectric resonator may penetrate to the back surface of the insulating substrate. In this case, the electromagnetic field leaks from the input / output electrode to the back surface of the insulating substrate. This also causes the deterioration of the characteristics.
It is preferable to shield with a metal piece 46 or a dielectric 47. In this case, since there is no wiring conductor, it is possible to completely shield.

An example in which the present invention is applied to a dielectric waveguide filter is shown in FIGS. In each case, a dielectric filter is inserted into an insulating substrate to connect the input / output electrodes to the conductor lines and shielded by a metal piece or a dielectric.

FIG. 5 shows that the resonators are arranged laterally with respect to the input / output electrodes, the width of the coupling portion is formed narrow, and the coupling between the resonators is adjusted so that a desired bandpass characteristic can be obtained. Things. A hole is formed in the substrate (A), a dielectric is inserted into the hole (B), and a metal piece 56 is provided at the input / output electrode portion (C).

FIG. 6 shows that the resonators are arranged vertically with respect to the input / output electrodes and the width of the coupling portion is narrowed, so that the coupling between the resonators is adjusted and a desired bandpass characteristic can be obtained. It was made. A hole is formed in the substrate (A), a dielectric is inserted therein (B), and a metal piece is
66 is provided (C).

The dielectric waveguide type filter is not limited to the block type as described above, and there is also a type in which a rectangular parallelepiped dielectric element is joined at an end surface on which a conductive film is partially formed. The shielding structure can be applied as it is. In addition, a conductor pattern for mounting can be connected to the conductor line of the insulating substrate, which facilitates mounting of a dielectric waveguide resonator and a filter, which are difficult to mount on a surface.

FIG. 7 shows that an input / output electrode is formed on an adjacent surface of one dielectric to couple two electromagnetic field modes,
It is intended to obtain desired bandpass characteristics.
A hole is formed in the substrate (A), a dielectric is inserted into the hole (B), and a metal piece 76 is provided at the input / output electrode portion (C).

[0020]

According to the present invention, by covering with a metal piece or a dielectric, leakage of an electromagnetic field from a connection portion between an input / output electrode and a conductor line can be reduced. for that reason,
The loss at the connection part can be reduced, and the characteristics of the resonator and the filter can be improved. There is also an advantage that the influence of an external electromagnetic field can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIG. 3 is a perspective view showing another embodiment of the present invention.

FIG. 4 is a perspective view showing another embodiment of the present invention.

FIG. 5 is a perspective view showing another embodiment of the present invention.

FIG. 6 is a perspective view showing another embodiment of the present invention.

FIG. 7 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 10: Insulating substrate 11: Dielectric resonator 12: Conductor line 13: I / O electrode 16, 26, 46, 56, 66, 76: Metal piece 37, 47: Dielectric

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuhisa Sano 828 Hinohara, Tamagawa-mura, Hiki-gun, Hiki-gun, Saitama F-term in Tamagawa Plant, Toko Corporation 5J006 HC01 HC03 HC23 JA01 JA21 JB02 JB03 LA02 LA03 LA07 LA13 NA07 ND01 NE02 PA03 5J014 CA08 CA23 CA42 CA53

Claims (6)

[Claims] 1. A dielectric resonator comprising an input / output electrode and a ground electrode in a dielectric, comprising: an input / output electrode formed of an island-shaped conductor film on one surface of a rectangular parallelepiped dielectric; The input / output electrodes were formed on substantially the entire remaining surface, and the dielectric was provided with a ground electrode formed of a conductor film formed on the other surface, and the dielectric was provided on the surface with a conductor line connected to the input / output electrodes. The input / output electrodes are inserted into the holes of the insulating substrate, the input / output electrodes are connected to the conductor lines of the insulating substrate, and the input / output electrodes and the conductor lines surround the input / output electrodes and cover the connection between the conductor lines and the input / output electrodes. A dielectric resonator comprising a conductor insulated and connected to a ground conductor. 2. The dielectric resonator according to claim 1, further comprising a conductor that covers an input / output electrode on a back surface of the insulating substrate and is insulated from the input / output electrode and connected to a ground electrode. 3. A dielectric filter in which a plurality of rectangular parallelepiped dielectric resonators are coupled, wherein input / output electrodes formed of an island-shaped conductive film are provided on the same surface of the rectangular parallelepiped dielectric material at both ends. A ground electrode formed of a conductive film formed on the entire surface of the remaining surface of the dielectric and the other surface of the dielectric, and formed on the entire surface of the intermediate resonator and around the coupling portion, and on the substantially entire surface of the surface where the input / output electrodes are formed. The dielectric is inserted into the hole of the insulating substrate provided with the conductor line connected to the input / output electrode on the surface, and the input / output electrode and the conductor line of the insulating substrate are connected, and the periphery of the input / output electrode is surrounded. 1. A dielectric filter, comprising: a conductor that covers a connecting portion between a conductor line and an input / output electrode and is insulated from the input / output electrode and the conductor line and connected to a ground conductor. 4. A dielectric filter in which a plurality of rectangular parallelepiped dielectric resonators are coupled to each other, wherein input / output electrodes are formed by island-shaped conductor films on opposing surfaces of the rectangular parallelepiped dielectrics at both ends, and are separated from the input / output electrodes. A ground electrode made of a conductive film formed on almost the entire remaining surface of the insulated and input / output electrodes and the entire surface of the intermediate resonator and the periphery of the coupling portion formed on the other surface of the dielectric. The dielectric is inserted into the hole of the insulating substrate provided with the conductor line connected to the input / output electrode on the surface, the input / output electrode and the conductor line of the insulating substrate are connected, and the periphery of the input / output electrode is surrounded. A dielectric filter, comprising: a conductor that covers a connection between a conductor line and an input / output electrode and is insulated from the input / output electrode and the conductor line and connected to a ground conductor. 5. A dielectric filter for coupling two electromagnetic field modes in a rectangular parallelepiped dielectric, comprising: an input / output electrode formed of an island-shaped conductive film on adjacent surfaces of a rectangular parallelepiped dielectric; A conductor connected to the input / output electrode on the surface, comprising a ground electrode formed of a conductor film formed on substantially the entire remaining surface of the insulated and input / output electrode and the entire surface of the other surface of the dielectric; The input / output electrode is inserted into the hole of the insulating substrate provided with the line, the input / output electrode is connected to the conductor line of the insulating substrate, and the connection portion between the conductor line and the input / output electrode is surrounded around the input / output electrode. And a conductor insulated from the conductor line and connected to the ground conductor. 6. The dielectric filter according to claim 3, further comprising a conductor which covers an input / output electrode on a back surface of the insulating substrate and is insulated from the input / output electrode and connected to a ground electrode.