JPH0794921A - Dielectric coaxial resonator - Google Patents

Abstract

PURPOSE:To reduce the number of parts to be used and the production cost of a dielectric coaxial resonator and to standardize respective parts in the case of constituting a serial trap circuit consisting of a capacitor and the resonator. CONSTITUTION:In the dielectric coaxial resonator having an external conductor 2 formed on the outer surface of a dielectric block 1 and an inner conductor 3 formed on the inner surface of a hole formed on the block 1 and starting resonance at prescribed frequency, an electrode 6 for a capacitor element is formed on the surface of the block 1 along the axial direction of the conductor 3 in an insulated state from the conductor 2 to obtain serial resonance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric coaxial resonator.

[0002]

2. Description of the Related Art FIGS. 5A and 5B show a conventional dielectric coaxial resonator, wherein FIG. 5A is a perspective view seen from the mounting substrate side, and FIG. 5B is a sectional view taken along line CC of FIG. That is, the hole is formed in the dielectric block 1, and the inner conductor 3 is formed on the inner peripheral surface of the hole.
The electrode film is formed as. In addition, one of the two surfaces through which the resonator hole 4 penetrates is an open end 5 without an electrode film, and an electrode film to be an outer conductor 2 is formed on the surface of the dielectric block 1.

FIG. 6 shows a case where a series trap circuit of a capacitor and a resonator is formed as a circuit for attenuating a specific frequency in a band elimination filter (BEF) using the dielectric coaxial resonator. FIG. 6A is a perspective view of the circuit viewed from above the mounting substrate. That is,
There is a metal substrate 11 which is a part of the case, and a base substrate 10 made of a dielectric is located on the metal substrate 11. The base substrate 10 has an electrode film (not shown) on the bottom surface 12 facing the metal substrate 11, and the both substrates are connected by solder. Further, the electrode of the capacitor 9 having a predetermined capacity is soldered to the electrode 13 provided on the base substrate 10. Input / output terminals 17, 17 are provided on both sides of the electrode 13 along the base substrate 10, and both ends thereof are connected to a mounting substrate of a user. On the other hand, in the resonator hole 4 at the open end 5 without the electrode film of the dielectric block 1,
One end of the metal terminal 8 is inserted and fixed, and the other end is connected to the electrode of the capacitor 9 with solder. Then, the outer conductor 2 on the bottom surface of the dielectric block 1 is also connected and fixed to the metal substrate 11 by soldering.

FIG. 6 (b) is an equivalent circuit diagram of FIG. 6 (a). In addition to the capacitance C1 by the capacitor 9, in the base substrate 10, the electrode 13 and the electrode film on the bottom surface 12 of the base substrate 10 (FIG. Capacitance C2 is generated between (not shown).

[0005]

However, in the circuit configuration of the conventional components as described above, the number of components other than the resonator, such as capacitors and metal terminals, is large, and the assembling process and the like associated therewith considerably increase the number of components. It was costly. In addition, in addition to the above-mentioned processing, a capacitance selecting step is required for the capacitor and a frequency adjusting step is required for the resonator, which is also a factor of cost increase.

Further, the sizes of capacitors and resonators differ depending on the values of capacitance and frequency, making standardization of parts difficult. In addition, in order to assemble and install each component on the same substrate, due to the difference in the thickness of the capacitor and resonator,
Standardization in design was also delayed, such as height adjustment when connecting the capacitor to the metal terminal and the resonator. Therefore, an object of the present invention is to reduce the number of parts used in the configuration of a series circuit of a capacitor and a resonator to reduce the cost of materials and processing, and to standardize the parts and the design. .

[0007]

The present invention has an outer conductor formed on the outer surface of a dielectric block and an inner conductor formed on the inner surface of a hole of the dielectric block, and is a dielectric that resonates at a predetermined frequency. In the body coaxial resonator, the electrode for the capacitive element is
It is provided on the surface of the dielectric block along the axial direction of the inner conductor in an insulated state from the outer conductor to obtain series resonance.

The dielectric coaxial resonator referred to in the present invention may be a resonator element part or the entire filter structure.

[0009]

According to the present invention, the dielectric coaxial resonator having the outer conductor formed on the outer surface of the dielectric block and the inner conductor formed on the inner surface of the hole of the dielectric block and resonating at a predetermined frequency. In, in order to obtain series resonance by providing an electrode for a capacitive element on the surface of the dielectric block along the axial direction of the inner conductor in an insulated state from the outer conductor, the dielectric block and the capacitor together with the capacitor are obtained. Elements can be formed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1A is a perspective view of the dielectric coaxial resonator in this embodiment as viewed from the mounting substrate side. On the surface of the dielectric block 1 facing the mounting substrate, one end of the electrode is provided in contact with the open end 5 without the electrode film of the resonator. It is placed in an insulated state. Then, a capacitance C is generated between the electrode 6 and the inner conductor 3 in the resonator hole 4 as a capacitor. Therefore, as shown in (b) which is a cross-sectional view taken along the line AA of FIG. 1 (a) and (c) of an equivalent circuit diagram, a series trap circuit of a resonator and a capacitor can be formed in the dielectric block 1, Eliminates the need for separate parts such as capacitors and metal terminals.

(Embodiment 2) FIG. 2A is a perspective view of the dielectric coaxial resonator in this embodiment as viewed from the mounting substrate side. Here, on the surface of the dielectric block 1 facing the mounting substrate, the electrode 6 for the capacitive element is provided with a constant width along the open end 5 without the electrode film, and both ends are near the edge of the surface facing the mounting substrate. Spread to Further, the electrode 6 is placed in an insulated state from the outer conductor 2 by a gap 14 having a constant width. Then, a capacitance C is generated between the electrode 6 and the inner conductor 3 in the resonator hole 4 as a capacitor.

(Embodiment 3) FIG. 2B is a perspective view of the dielectric coaxial resonator of this embodiment as viewed from the mounting substrate side. An electrode 6 for a capacitive element is provided with a constant width along the open end 5 without an electrode film, and extends to near the edge of the adjacent surface along the inner conductor. Further, the electrode 6 is placed in an insulated state from the outer conductor 2 by a gap 14 having a constant width. Then, a capacitance C is generated between the electrode 6 and the inner conductor 3 in the resonator hole 4 as a capacitor.

(Embodiment 4) FIG. 2C is a perspective view of the dielectric coaxial resonator of this embodiment as viewed from the mounting substrate side. An electrode 6 for a capacitive element is provided with a constant width along the open end 5 without an electrode film, and extends to near the edge of the adjacent side surface along the inner conductor. In addition, the gap 14 of a constant width
Thus, the electrode 6 is placed in an insulated state from the outer conductor 2, and the outer conductor 2 is provided between the gap 14 and the open end 5. Then, the electrode 6 and the inner conductor 3 in the resonator hole 4
An electrostatic capacitance C is generated as a capacitor between and.

(Embodiment 5) In FIG. 3A, two dielectric coaxial resonators having a trap element are arranged in parallel on a printed wiring board (PCB) 15 and a coil 7 is sandwiched between them to remove a band. It is a perspective view which comprises the filter (BEF). In this specification, the configuration of such an entire filter is also called a dielectric coaxial resonator. The electrode 6 for the capacitive element of the block body is adjacent to each other along the inner conductor 2
It is formed in contact with the open end 5 having no electrode film over the surface. An electrode pattern for connecting the outer conductor 2 of the resonator and the electrode 6 is provided in advance on the printed wiring board 15, and each electrode of the dielectric block 1 is connected by solder.

FIG. 3B shows the printed wiring board 15
2 is a top view, and two dielectric blocks 1 are located in a portion 17 surrounded by a broken line.

FIG. 3C is an equivalent circuit diagram of this embodiment, and this circuit provides the damping effect as shown in the characteristic diagram of FIG. 3D.

As shown in FIGS. 3 (a) and 3 (b),
Each electrode of the substrate 15 is connected to each external connection terminal electrode provided on the bottom surface (not shown) through the recess 16 having the electrode film disposed on the side surface.

(Embodiment 6) FIG. 4A is a perspective view of the dielectric coaxial resonator of this embodiment as seen from the mounting substrate side.
In this dielectric block 1, both surfaces having the resonator hole 4 are surfaces having the electrode film of the outer conductor 2. Also,
The cross-sectional view taken along the line BB is shown in FIG. Here, between the electrode 6 for the capacitive element on the surface of the dielectric block 1 and the electrodes at both ends of the gap 7 provided in the resonator hole 4,
Capacitances of C1 and C2 are generated, and as shown in the characteristic diagram of FIG. 4C, when the trap function of the resonator is independent of the capacitance (in the case of C1 shown by the solid line in the figure) It is higher than that (in the case of C1 + C2 indicated by a broken line in the figure). Note that FIG. 4D is an equivalent circuit diagram of this embodiment.

In the first to sixth embodiments described above, the trap frequency can be freely changed depending on the length of the resonator, the area of the electrode 6 for the capacitive element, and the like. The method of forming electrodes is plating etching or grinding.

[0020]

As described above, the present invention has the outer conductor formed on the outer surface of the dielectric block and the inner conductor formed on the inner surface of the hole of the dielectric block, and is a resonator that resonates at a predetermined frequency. In the body coaxial resonator, an electrode for a capacitive element is provided on the surface of the dielectric block along the axial direction of the inner conductor in an insulated state from the outer conductor to obtain series resonance. The dielectric block incorporates a capacitor element and a resonator, which eliminates the need for parts such as a capacitor and a metal terminal, which are conventionally required. Also,
By reducing the number of parts, not only the number of assembly steps and the number of selection steps can be reduced, but also adjustment of the height of the parts on the mounting board becomes unnecessary, and the standardization of the design progresses. Then, the space of the element formed of the capacitor and the like is not needed, the size is reduced, and the mounting density on the mounting substrate is increased.

As described above, the reduction in the number of parts leads to the cost reduction and the standardization, and the improvement in the mounting density leads to the miniaturization of the set.

[Brief description of drawings]

FIG. 1A is a perspective view of a dielectric coaxial resonator according to a first embodiment of the present invention. (B) is the sectional view on the AA line of the dielectric coaxial resonator of (a). (C) is an equivalent circuit diagram using the dielectric coaxial resonator of the first embodiment of the present invention.

FIG. 2A is a perspective view of a dielectric coaxial resonator according to a second embodiment of the present invention. (B) is a perspective view of a dielectric coaxial resonator according to a third embodiment of the present invention. (C) is a perspective view of a dielectric coaxial resonator according to a fourth embodiment of the present invention.

FIG. 3A is a perspective view of a dielectric coaxial resonator according to a fifth embodiment of the present invention. (B) is a top view of the printed wiring board of Example 5 of this invention. (C) is an equivalent circuit diagram using a dielectric coaxial resonator according to a fifth embodiment of the present invention. (D) is a characteristic view of a dielectric coaxial resonator according to a fifth embodiment of the present invention.

FIG. 4A is a perspective view of a dielectric coaxial resonator according to a sixth embodiment of the present invention. (B) is a BB line sectional view of the dielectric coaxial resonator of (a). (C) is a characteristic view using a dielectric coaxial resonator of Example 6 of the present invention. (D) is an equivalent circuit diagram using a dielectric coaxial resonator according to a sixth embodiment of the present invention.

FIG. 5A is a perspective view of a conventional dielectric coaxial resonator. (B) is CC sectional view taken on the line of the dielectric coaxial resonator of (a).

FIG. 6A is a perspective view of a series trap circuit using a conventional dielectric coaxial resonator. (B) is an equivalent circuit diagram of (a).

[Explanation of symbols]

 1 Dielectric block 2 Outer conductor 3 Inner conductor 6 Electrode

Claims (1)

[Claims] 1. A dielectric coaxial resonator having an outer conductor formed on an outer surface of a dielectric block and an inner conductor formed on an inner surface of a hole of the dielectric block, wherein the dielectric coaxial resonator resonates at a predetermined frequency. A dielectric coaxial resonator, wherein electrodes for use are provided on the surface of the dielectric block along the axial direction of the inner conductor in an insulated state from the outer conductor to obtain series resonance.