JPH0588005U - Dielectric resonator - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a small-sized dielectric resonator that can be used for a high frequency to ensure a predetermined line conductor length and obtain desired characteristics. [Structure] A conductor 2 for a transmission line is formed in a rolled-up structure and embedded in a dielectric 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dielectric resonator that constitutes a high-frequency voltage-controlled oscillator, a filter, or the like.

[0002]

[Problems to be solved by conventional techniques and devices]

 Dielectric resonators are widely used as mobile wireless devices such as car phones, various wireless devices such as mobile phones, and component parts such as voltage-controlled oscillators and filters incorporated therein. Conventionally, such a dielectric resonator has been manufactured by coating or electroplating a conductor for a transmission line on a dielectric ceramic processed into a cylindrical shape.

The length of the transmission line conductor of such a dielectric resonator is λ_g / 4 (λ_g Is the wavelength of the resonance frequency), and λ_g = Λ_o/ Ε _r ^0.5 Where ε_r: Relative permittivity of dielectric, λ_o: Wavelength in vacuum. The resonator used at high frequency like the above-mentioned application has a relative permittivity ε_rSince high value causes capacitive coupling, the relative permittivity ε is required to obtain desired characteristics._rWe have no choice but to choose a dielectric with a small value. Therefore, as is clear from the above equation, the length of the conductor must be increased. However, according to the conventional structure, since the conductor is formed in a straight line inside the cylinder, the length of the resonator is determined by the length of the line conductor, so that the resonator cannot be downsized. There was a problem. As a means for solving this problem, a structure in which a conductor and a dielectric are laminated and the conductor is bent into an L-shape on a plane to reduce the shape has been considered, but the conductor is bent. There was a limit to miniaturization.

The present invention has been made in view of the above problems, and an object thereof is to provide a small-sized dielectric resonator that can be used at a high frequency to ensure a predetermined conductor length for a line and obtain desired characteristics. And

[0005]

[Means for Solving the Problems]

 In order to achieve this object, the present invention is characterized in that a conductor for a transmission line is formed in a rolled-up structure by a laminated structure and embedded inside a dielectric.

[0006]

[Action]

 The dielectric resonator of the present invention has the above-mentioned structure, and the length of the transmission line conductor can be extended in the vertical direction.

[0007]

【Example】

 FIG. 1A is a perspective view showing an embodiment of a dielectric resonator according to the present invention before a peripheral side electrode is attached, FIG. 1B is a perspective view showing a side electrode attached, and FIG. Is a sectional view taken along line EE, and (D) is an equivalent circuit diagram. In FIG. 1A, 1 is a ceramic dielectric, 2 is a transmission line conductor, 3a to 3c are ground electrodes, and conductor 2 and ground electrodes 3a to 3c are copper, silver, or silver-palladium. And the like, and is laminated with the dielectric 1 by a printing method or a sheet method and fired. The conductor 2 includes a straight portion 2a between the middle ground electrode 3b and a lower layer ground electrode 3a, a parallel portion 2c arranged in parallel with the middle ground electrode 3b, and a portion 2b connecting these portions 2a and 2c. And a straight line portion 2e between the intermediate ground electrode 3b and the upper ground electrode 3c, and a portion 2d connecting the parallel portion 2c and the straight line 2e arranged in parallel to the intermediate ground electrode 3b. The total length of the portions 2a to 2e is 1/4 of the wavelength. In the intermediate product shown in FIG. 1A, one end of the lower linear portion 2a is exposed on one side surface of the rectangular dielectric 1 and one end of the upper linear portion 2e is exposed on the other side surface of the dielectric 1. Exposed.

As shown in FIG. 1B, a hot terminal electrode 4 connected to one end of the lower linear portion 2a of the conductor 2 is formed on one side surface of the dielectric 1 by baking or electroplating, Ground terminal electrodes 5 connected to the other ends of the ground electrodes 3a to 3c and the conductor 2e are formed on the other three side surfaces by baking or electroplating. These terminal electrodes 4 and 5 are also made of copper, silver, silver-palladium or the like.

As shown in FIG. 1C, in this dielectric resonator, the conductor 2 forms an inductance L component, and the conductor 2 and the ground electrodes 3 a to 3 c and the dielectric 1 between the conductors are included in the dielectric resonator. A quantity C component is formed.

FIG. 2 shows a process for manufacturing the resonator of this embodiment by a printing method for one resonator. First, as shown in (a), after printing the lower-layer ground electrode 3a, As shown in (b), a dielectric 1a is printed on the lower-layer ground electrode 3a, and as shown in (c), a lower linear portion 2a of the conductor 2 facing the intermediate ground electrode 3b, The connecting portion 2b and a part of the portion 2c parallel to the intermediate ground electrode 3b are printed. After that, as shown in (d), the dielectric 1b is printed on the half surface so as to cover the lower linear portion 2a of the conductor 2, and as shown in (e), the intermediate ground electrode 3b is placed on the dielectric 1b. Printing is performed, and as shown in (f), the dielectric 1c is printed thereon. Then, as shown in (g), the upper linear portion 2e of the conductor 2, the remaining portion of the portion 2c parallel to the intermediate ground electrode 3b, and the connecting portion 2d are printed. Next, as shown in (h), the entire surface is covered with a dielectric 1d, and an upper layer ground electrode 3c is printed thereon as shown in (i). The intermediate product shown in FIG. 1 (A) is obtained by firing this and cutting it into pieces as shown in the figure. After that, the terminal electrodes 4 and 5 are baked or electroplated to obtain the intermediate product shown in FIG. 1 (B). The product shown in.

By thus forming the conductor 2 in a rolled-up shape, the conductor 2 can be made longer than in the case where the conductor 2 is formed in a linear shape, and as a result, the overall shape of the resonator can be reduced. Is possible. In the above-mentioned embodiment, the conductor 2 is wound up by about one turn, but if the number of turns is increased, the shape of the resonator can be further reduced. When the structure of the present invention is realized, the ground electrode 3b of the intermediate layer is not always necessary, but by providing this ground electrode 3b, the capacitance component of the conductor 2 itself is provided between the conductor 2 and the ground electrode 3b. It can be converted to capacitance, which makes designing very easy.

In the present invention, a structure in which the ground electrodes 3a and 3c are embedded in the dielectric body to prevent oxidation, or a part of the ground terminal electrode 5 may be embedded in the dielectric body 1 may be used. It is also possible to realize the resonator as a structure formed in one dielectric block.

[0013]

[Effect of the device]

 According to the present invention, since the conductor for the transmission line is formed into a wound shape by the laminated structure, a long conductor can be formed in a small dielectric body, and thus the resonator can be miniaturized.

[Brief description of drawings]

FIG. 1A is a perspective view showing an embodiment of a dielectric resonator according to the present invention in the state of an intermediate product, FIG. 1B is a perspective view showing the overall configuration of this embodiment, and FIG. ) EE cross-sectional view,
(D) is an equivalent circuit diagram thereof.

FIG. 2 is a manufacturing process diagram of the present embodiment.

[Explanation of symbols]

 1, 1a to 1d Dielectric 2, 2a to 2e Conductors 3a to 3c Ground electrode 4 Hot terminal electrode 5 Ground terminal electrode

Claims (1)

[Scope of utility model registration request] 1. A dielectric resonator, wherein a conductor for a transmission line is formed in a rolled-up structure by a laminated structure and embedded inside a dielectric.