JP3441126B2 - Method of adjusting characteristics of dielectric resonant component - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the characteristics of a dielectric resonance component, and more particularly, to the characteristics of a dielectric resonance component having a dielectric coaxial resonator. Regarding the adjustment method. 2. Description of the Related Art Conventionally, at least one inner conductor forming hole is provided in a dielectric block, an inner conductor is formed in each inner conductor forming hole, and an outer conductor and an input / output are formed in an outer peripheral surface of the dielectric block. Various dielectric resonant components having electrodes formed thereon have been proposed. Such a dielectric resonance component is usually constituted by a single block, and is formed with one or more dielectric coaxial resonators, and is used as a filter or an electronic component of various resonance circuits by utilizing its resonance characteristics. Have been. FIG. 6A is a diagram showing an example of the configuration of a conventional antenna duplexer using the above-described dielectric resonance component. In FIG. 6A, a transmission dielectric filter Tx composed of the above-described dielectric resonance component is interposed between the transmission signal input terminal 10 and the antenna terminal 20. Also, the reception signal output terminal 30 and the antenna terminal 2
A receiving dielectric filter Rx composed of the above-described dielectric resonance component is interposed between 0 and 0. The antenna ANT is connected to the antenna terminal 20. In the antenna duplexer having the above configuration, the transmission dielectric filter Tx allows only the transmission signal input from the transmission signal input terminal 10 to pass and does not allow the signal received by the antenna ANT to pass. The resonance characteristics are set. The resonance characteristic of the reception dielectric filter Rx is set so that only the signal received by the antenna ANT is passed and the transmission signal from the transmission dielectric filter Tx is not passed. As a result, the transmission / reception signal is demultiplexed. When an antenna duplexer is formed using a dielectric filter as described above, the reflection phase in the Rx pass band of the transmission dielectric filter Tx and the reception dielectric are determined. It is necessary to adjust the reflection phase in the Tx pass band of the filter Rx to the open state. If the reflection phases of the two differ, the matching loss increases, and the characteristics of the antenna duplexer deteriorate. [0006] However, since the dielectric filter is a single filter, if the shape of the dielectric block is determined, the angle of the reflection phase is naturally determined. Therefore, in order to change the reflection phase on the transmission side and the reception side, an LC resonance circuit is added as shown in FIG. 6B, or a distributed constant line (such as a coaxial cable) as shown in FIG. ) Had to be added. As a result, there is a problem that the configuration of the antenna duplexer becomes large and expensive. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for adjusting characteristics so that the reflection phase of a dielectric resonance component can be easily adjusted. Means for Solving the Problems The invention according to claim 1 is:
A method for adjusting characteristics of a dielectric resonance component having a dielectric coaxial resonator, wherein the dielectric resonance component is made of a dielectric material, and has first and second end faces and a second end face from the first end face.
Block having a plurality of side surfaces extending over an end surface of the inner conductor and one or more inner conductor forming holes penetrating therethrough and opening at the first and second end surfaces, an inner conductor formed inside each inner conductor forming hole An outer conductor formed on at least a side surface of the dielectric block, and an input / output electrode provided on at least an outer peripheral surface of the dielectric block in a state in which the outer conductor is electrically insulated from the outer conductor. The characteristics of the dielectric resonance component are adjusted by changing the distance between the components. According to the first aspect of the present invention, by changing the distance between the outer conductor and each of the input / output electrodes, the capacitance generated between them is controlled, whereby the characteristic of the dielectric resonance component is obtained. To adjust. FIG. 1 is a diagram showing the configuration of a dielectric resonance component to which the present invention is applied. 1 (a) is a perspective view as viewed obliquely from above, FIG. 1 (b) is a perspective view as viewed obliquely from below, and FIG. 1 (c) is a view of FIG. 1 (a). It shows a cross-sectional view along the line AA ′. In FIG. 1, a dielectric block 1 made of a dielectric material such as ceramics has first and second end faces 1a and 1b each having a substantially rectangular shape, and a rectangular block 4 extending from the first end face 1a to the second end face 1b.
It is formed in a substantially rectangular parallelepiped shape having two side surfaces. In this dielectric block 1, for example, two inner conductor forming holes 2
a, 2b are formed. Each inner conductor forming hole 2a, 2b
Penetrates through the inside of the dielectric block 1 and opens at the first and second end faces 1a and 1b of the dielectric block 1. An inner conductor 4 is formed on the inner peripheral surface of each inner conductor forming hole 2a, 2b. An outer conductor 5 is formed on the first end surface 1a, the second end surface 1b, and each side surface of the dielectric block 1. Inside the inner conductor forming holes 2a and 2b, an inner conductor non-formed portion 8 is provided between one end of each inner conductor 4 and the first end face 1a. Therefore, one end of each inner conductor 4 is not electrically connected to the outer conductor 5 on the first end face 1 a of the dielectric block 1. on the other hand,
The other end of each inner conductor 4 is electrically connected to the outer conductor 5 on the second end face 1b of the dielectric block 1. Also,
On the side surface of the dielectric block 1, a pair of input / output electrodes 6a and 6b are formed in a state of being electrically insulated from the outer conductor 5. The outer conductor 5 is grounded. The dielectric resonance component shown in FIG.
With two quarter-wave dielectric coaxial resonators. The respective dielectric coaxial resonators are connected to each other inside or outside the dielectric block 1 to form a filter, a resonance circuit, and the like. FIG. 2 is an equivalent circuit diagram of the dielectric resonance component shown in FIG. In FIG. 2, a dielectric resonator R1 is a dielectric coaxial resonator formed around an inner conductor forming hole 2a, and a dielectric resonator R2 is a dielectric coaxial resonator formed around an inner conductor forming hole 2b. It is a vessel. Input / output electrodes 6a, 6b
And the inner conductor 4 in the inner conductor forming holes 2a and 2c,
Each has an external coupling capacitance Ce. Further, an input / output capacitance _C01 is generated between the input / output electrode 6a and the outer conductor 5, and
An input / output capacitance _C02 is generated between the input / output electrode 6b and the outer conductor 5. When the input / output capacitances C ₀₁ and C ₀₂ are changed, the reflection phase characteristics of the dielectric resonance component change. That is, when the input / output capacitances C ₀₁ and C ₀₂ are increased, the reflection phase angle θ changes clockwise as shown in FIG. The input / output capacitances C ₀₁ and C ₀₂ are the distance between the input / output electrode 6a and the outer conductor 5 (hereinafter referred to as a first inter-electrode gap) L1, the input / output electrode 6b and the outer conductor 5 respectively. (Hereinafter, referred to as a second inter-electrode gap) L2. Therefore, in the present invention, the reflection phase characteristic of the dielectric resonance component is adjusted by changing the first and second gaps L1 and L2 between the electrodes. The first and second electrode gaps L
1 and L2 may be adjusted by shaving the side surface of the dielectric block 1 with a router or the like after the completion of the dielectric resonance component shown in FIG.
1, L2 may be measured in advance, and the outer conductor 5 and the input / output electrodes 6a, 6b may be formed in accordance therewith. The top view of FIG. 4A and FIG.
As shown in the side view of (b), if necessary, the first inter-electrode gap L1 and the second inter-electrode gap L2 may have different values. Further, as shown in a top view of FIG. 5A and a side view of FIG. 5B, irregularities may be formed in the shapes of the input / output electrodes 6a and 6b. In the above embodiment, the dielectric resonance component whose characteristic is to be adjusted has 1 /
Although the configuration is such that a four-wavelength dielectric coaxial resonator is formed, a configuration in which a half-wavelength dielectric coaxial resonator is formed inside the dielectric block 1 may be used. In this case, in order to make the potential at one end and the potential at the other end of the inner conductor 4 inside each of the inner conductor forming holes 2a and 2b the same,
One end and the other end of the inner conductor 4 inside each of the inner conductor forming holes 2a and 2b are either in a short-circuit state in which the inner conductor 4 is in contact with the outer conductor 5, or are open in which neither is in contact with the outer conductor 5. It needs to be in a state. In the former case, the inner conductor non-formed portion 8 may be omitted from each of the above embodiments, and a configuration may be employed in which one end of the inner conductor 4 extends to the first end surface 1a of the dielectric block 1. In the latter case, the first of the dielectric blocks 1
In addition, the outer conductor 5 is not formed on the second end faces 1a and 1b, or the inner conductor forming holes 2a and 2b are provided with the vicinity of the first end face 1a and the vicinity of the second end face 1b. What is necessary is just to provide the inner conductor non-forming part 8 in both. In the above embodiment, the dielectric block 1
Although two dielectric coaxial resonators are formed therein, this is merely an example, and the number of dielectric coaxial resonators provided in the dielectric block 1 may be one or three or more.
The number of inner conductor forming holes is also increased or decreased according to the number of dielectric coaxial resonators. Further, in each of the above-described embodiments, the dielectric block 1 is formed as a single unit. However, a plurality of divided dielectric blocks are bonded together by bonding, welding, etc.
One dielectric block 1 may be obtained. In this case, one or a plurality of inner conductor forming holes are provided in each of the divided dielectric blocks before bonding. Further, in each of the above embodiments, the shape of the dielectric block 1 is a rectangular parallelepiped. However, the first and second end faces 1a and 1b and the first and second end faces 1a and 1b are formed.
Other shapes (for example, a cylinder, a hexagonal prism, etc.) may be used as long as the shape has a side surface extending over b. According to the first aspect of the present invention, by changing the distance between the outer conductor and each input / output electrode, the capacitance generated between the two can be controlled. The characteristics of the dielectric resonance component can be easily adjusted. Therefore, even when used in a duplexer or the like, it is not necessary to add a circuit for phase matching as in the related art, and the configuration can be reduced in size and cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an example of a configuration of a dielectric resonance component to be subjected to characteristic adjustment of the present invention. FIG. 2 is an equivalent circuit diagram of the dielectric resonance component shown in FIG. FIG. 3 is a diagram showing a relationship between first and second gaps L1 and L2 between electrodes and a reflection phase angle θ in the dielectric resonance component shown in FIG. 1; FIG. 4 is a diagram showing another example of the configuration of the dielectric resonance component to be subjected to the characteristic adjustment of the present invention. FIG. 5 is a diagram showing still another example of the configuration of the dielectric resonance component to be subjected to the characteristic adjustment of the present invention. FIG. 6 is a diagram showing a configuration of a conventional antenna duplexer using a dielectric resonance component. [Description of Signs] 1 ... Dielectric block 1a ... First end face 1b ... Second end face 2a, 2b ... Inner conductor forming hole 4 ... Inner conductor 5 ... Outer conductors 6a and 6b ... I / O electrode 8 ... Inner conductor non-connection Formed portions L1, L2: gap between electrodes

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01P 1/20-1/219 H01P ^7/ 00-7/10 H01P 5/04

Claims (1)

(57) [Claim 1] A method for adjusting characteristics of a dielectric resonance component having a dielectric coaxial resonator, wherein the dielectric resonance component is formed of a dielectric material. First and second end faces;
A dielectric block having a plurality of side surfaces extending from an end surface of the inner conductor to a second end surface, and one or more inner conductor forming holes penetrating the inside and opening at the first and second end surfaces; An outer conductor formed on at least a side surface of the dielectric block, and an input / output electrode provided on at least an outer peripheral surface of the dielectric block in a state of being electrically insulated from the outer conductor. A predetermined frequency band outside the pass band of the dielectric resonance component
By changing the distance between the outer conductor and the input / output electrode so as to open the reflection phase in the region ,
A characteristic adjusting method of the dielectric resonant component, comprising adjusting the characteristic of the dielectric resonant component.