JPH07106804A - Dielectric filter - Google Patents

Abstract

PURPOSE:To reduce the size and number of assembling man-hours by forming a microstrip resonator electrode to an outer side wall of a dielectric filter block so as to reduce number of components. CONSTITUTION:An outer conductor 1a being a ground is provided to six sides of a cuboid dielectric filter block 1 and microstrip resonator electrodes 2, 3 are provided to left and right side faces in the block 1 itself whose outer conductor 1a is removed. An input electrode 2a is led from the electrode 2 up to a left side in the front and an output electrode 3a is led from the electrode 3 up to a right side in the front. An inner conductor 4a is provided to a throughhole 4 of the block 1 except the surface 4b of the ring block 1 in the vicinity of a lower opening to form a dielectric resonator. The inner conductor 4a is connected to the outer conductor 1a on the upper side to form the dielectric resonator whose one end is short-circuited and whose other end is open.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric filter having a microstrip resonator electrode formed on the outer side wall of a dielectric filter block of a dielectric resonator.

[0002]

2. Description of the Related Art FIG. 12 is a dielectric filter circuit diagram of a three-stage capacitor coupling BPF configuration. R11, R12, R
Reference numeral 13 is a dielectric resonator, and C is a coupling capacitor. Conventionally, when the dielectric filter circuit shown in FIG. 1 is used as an actual component, it is composed of at least 13 elements as shown in FIG. That is, the printed circuit board 11, the four coupling capacitors 12, the three dielectric resonators 13, the three terminals 14, the cover 15, and the label 1
It is 6.

[0003]

The conventional dielectric filter has a large number of parts, resulting in a large size, a high material cost, and a large number of assembling steps.

Therefore, the present invention is based on λ / 4 or λ /
(2) At least one or more microstrip resonator electrodes are formed on the outer side wall of the dielectric filter block of the two dielectric coaxial resonators, and the dielectric coaxial resonator and the microstrip resonator are electromagnetically coupled to each other. Therefore, it is an object of the present invention to provide a dielectric filter which has a small number of parts, a small size, a low material cost, and a small number of assembling steps.

[0005]

According to the present invention, at least one or more microstrip resonator electrodes are formed on an outer side wall of a dielectric filter block of a λ / 4 or λ / 2 dielectric coaxial resonator, and It is a dielectric filter in which a body coaxial resonator and a microstrip resonator are electromagnetically coupled.

[0006]

According to the present invention, at least one or more microstrip resonator electrodes are formed on the outer side wall of the dielectric filter block of the λ / 4 or λ / 2 dielectric coaxial resonator. At least one or more microstrip resonators will be formed integrally with the occupied volume.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a BPF three-stage dielectric filter circuit. R1, R2 and R3 are magnetic field coupled λ / 4 dielectric resonators. FIG. 2 is a perspective view of a first embodiment of the present invention embodying the dielectric filter circuit shown in FIG. FIG. 3 is a developed view thereof, and FIG. 4 is a sectional view taken along the line AA in FIG. Note that FIG. 3 illustrates the bottom view of FIG. 2 as a front view.

In FIGS. 2, 3 and 4, reference numeral 1 is a rectangular parallelepiped type dielectric filter block having an outer conductor 1a serving as a ground on its six faces. On the left side surface and the right side surface, microstrip resonator electrodes 2 and 3 are provided in the background of the dielectric filter block excluding the outer conductor 1a. An input electrode 2a is led out from the microstrip resonator electrode 2 to the front left side, and an output electrode 3a is led from the microstrip resonator electrode 3 to the front right side.

A through hole 4 is provided in the rectangular parallelepiped dielectric filter block 1. An inner conductor 4a is provided in the through hole 4 except for the ground surface 4b of the ring-shaped dielectric filter block near the lower opening.
Will constitute the dielectric resonator R2. The inner conductor 4a is connected to the outer conductor 1a on the upper surface. Therefore, a dielectric resonator with one end short-circuited and the other end open is configured.

Microstrip resonator electrodes 2 and 3
The microstrip resonator constituted by the above-mentioned elements respectively constitutes the dielectric resonators R1 and R3 in FIG. These microstrip resonators R1 and R3 are electromagnetically coupled to the dielectric resonator R2 and the dielectric filter block 1. FIG. 5 shows a dielectric filter circuit having a four-stage electromagnetic field coupling BPF configuration.
R4, R5, R6, and R7 are electromagnetic field coupling λ / 4 dielectric resonators. A concrete example of the dielectric filter circuit shown in FIG. 5 is a second embodiment shown in FIG. The rectangular parallelepiped dielectric filter block 1 has outer conductors 1a formed on its six faces. Microstrip resonator electrodes 2 (not visible in the figure) and 3, these microstrips are formed on the both sides of the surface of the dielectric filter block excluding the outer conductor 1a, as in the first embodiment. Input / output electrode 2a led out from the resonator electrodes 2 and 3 to one side of the lower surface
3a (not visible in the figure) is provided. On the other hand, a through hole is provided in the dielectric filter block 1, and an inner conductor is formed in the through hole excluding the background of the ring-shaped dielectric filter. The resonators R5 and R6 will be configured. The dielectric resonators R5 and R6 formed in the dielectric filter block 1 and the microstrip resonators R4 and R7 formed on both side walls of the dielectric filter block are electromagnetically coupled to each other to form the dielectric of FIG. A filter circuit will be configured.

FIG. 7 shows dielectric resonators R8, R9, R10,
This is a dielectric filter circuit composed of external coupling capacitors C1 and C2. The dielectric filter circuit shown in FIG. 7 is embodied by λ / 4 dielectric resonators R8, R9, and R10 in the third embodiment shown in FIGS. 8 and 9. The dielectric filter block has a resonator open surface 1 on the bottom surface.
The outer conductor 1a is formed except for b. On the left side surface of the dielectric filter block, a microstrip resonator electrode 2 integrated with a capacitor electrode 2b is formed in the background of the dielectric filter block excluding the outer conductor 1a. Further, on the right side surface of the dielectric filter block, a microstrip resonator electrode 3 integrated with a capacitor electrode 3b is formed in the background of the dielectric filter block excluding the outer conductor 1a.

An input electrode 2a is provided by bending in the left side surface and front surface of the dielectric filter block, and an output electrode 3a is provided by bending in the right side surface and front surface of the dielectric filter block. Has been. A through hole 4 is formed in the dielectric filter block, and an inner conductor 4a is formed in the through hole 4 to form a λ / 4 dielectric resonator R9 with one end short-circuited and the other end opened. . Microstrip resonator electrodes 2 formed on both sides of the dielectric filter block
7 and 3 form the dielectric resonators R8 and R10 in FIG. 7, and are electromagnetically coupled with the dielectric resonator R9.

In the dielectric filter circuit of FIG. 7, C1
Is formed between the edge of the input electrode 2a and the edge of the capacitor electrode 2b. C2 is formed between the edge of the output electrode 3a and the edge of the capacitor electrode 3b.

10 and 11 show the dielectric filter circuit shown in FIG. 7 with λ / 2 dielectric resonators R8, R9, and R10.
It is composed of. In the rectangular parallelepiped dielectric filter block, the outer conductor 1a is provided on six surfaces, the inner conductor 4a is provided in the through hole 4, and the inner conductor 4a is connected to the outer conductor 1a at both end faces, respectively. . A microstrip resonator electrode 2 is provided in the background of the dielectric filter block from which the outer conductor 1a on the left side surface of the dielectric filter block is removed, and both ends of the microstrip resonator electrode 2 are connected to the outer conductor 1a. Are short-circuited.
A microstrip resonator electrode 3 is provided in the background of the dielectric filter block from which the outer conductor 1a on the right side surface of the dielectric filter block is removed, and both ends of this microstrip resonator electrode 3 are also connected to the outer conductor 1a. Are short-circuited. An input electrode 2a is provided by bending in the background of the left side and the front of the dielectric filter block, and an output electrode 3a is provided by bending in the background of the right side and the front independently. . In the dielectric filter circuit of FIG. 7, C1 is formed between the edge of the input electrode 2a and the edge of the microstrip resonator electrode 2. C2 is formed between the edge of the output electrode 3a and the edge of the microstrip resonator electrode 3.

[0015]

According to the present invention, at least one or more microstrip resonator electrodes are formed on the outer side wall of a dielectric filter block of a λ / 4 or λ / 2 dielectric coaxial resonator to form a dielectric coaxial resonator. Since the dielectric filter is constructed by electromagnetically coupling with the microstrip resonator,
The number of parts is small, so the size is small, the material cost is low, and the number of assembly work steps is small.

[Brief description of drawings]

FIG. 1 is a dielectric filter circuit diagram according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the first embodiment.

FIG. 3 is a development view of FIG.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is a dielectric filter circuit diagram according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a second embodiment.

FIG. 7 is a dielectric filter circuit diagram according to third and fourth embodiments of the present invention.

FIG. 8 is a development view of the third embodiment.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is a development view of the fourth embodiment.

11 is a sectional view taken along line CC of FIG.

FIG. 12 is a conventional dielectric filter circuit diagram.

FIG. 13 is an exploded perspective view of a conventional dielectric filter.

[Explanation of symbols]

 1 Dielectric Filter Block 1a Outer Conductor 2, 3 Microstrip Resonator Electrode 2a Input Electrode 3a Output Electrode 4 Through Hole 4a Inner Conductor 4b Background

Claims (1)

[Claims] 1. A dielectric coaxial resonator and a microstrip resonance, wherein at least one microstrip resonator electrode is formed on an outer side wall of a dielectric filter block of a λ / 4 or λ / 2 dielectric coaxial resonator. A dielectric filter that is electromagnetically coupled to a container.