JP3484739B2 - Dielectric resonator and method of adjusting resonance frequency of dielectric resonator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator and a resonance frequency adjusting method for the dielectric resonator. Specifically, the present invention relates to a dielectric resonator using a dielectric and a method of adjusting the resonance frequency thereof.

[0002]

2. Description of the Related Art In a conventional dielectric resonator, for example,
There is a type in which a dielectric resonator made of a cylindrical or cylindrical dielectric is fixed on a support and housed in a cylindrical shield case. The apparent wavelength λ of an electromagnetic wave in a dielectric medium is λ =, where ε is the relative permittivity of the medium.
Since λ ₀ / √ε (λ ₀ is a wavelength in vacuum) is short, the dielectric resonator can be downsized by using a dielectric having a large relative permittivity ε as a medium.

[0003]

As a method of adjusting the resonance frequency of a dielectric resonator using these cylindrical or cylindrical dielectric resonators, the length of the dielectric resonator, which is a dielectric medium, in the axial direction is changed. There was a way. However, if the length of the dielectric resonator in the axial direction is changed, the arrangement of the dielectric resonator becomes asymmetric, the current flowing in the shield case increases, and the no-load Q of the dielectric resonator tends to decrease. there were. Further, in order to change the axial length, it is necessary to polish the dielectric resonator, and the polishing work is complicated and takes a lot of work time. It is very difficult to adjust the resonance frequency of the dielectric resonator. Met.

Further, since there are variations in the characteristics of the dielectric resonator, it is necessary to carry out the polishing work according to the characteristics, and it is very difficult to make adjustments by the polishing work, and if the adjustment fails, readjustment is performed. There is also a problem that it is impossible to produce defective products.

The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and an object thereof is to adjust the resonance frequency of a dielectric resonator using a dielectric without lowering the Q value. To make it easier.

[0006]

According to another aspect of the present invention, there is provided a dielectric resonator including a dielectric resonator, wherein the dielectric resonator comprises a plurality of dielectric resonant elements, and the magnetic lines of force represent respective dielectric resonant elements. Again configured to traverse, at least two or more dielectric resonance element of said dielectric resonator element, notches, cuts, holes, you are characterized in that a partial cutaway portion of such recess.

A resonance frequency adjusting method for a dielectric resonator according to the present invention is a method for adjusting a resonance frequency of a dielectric resonator according to claim 1, wherein the partial cutout is provided in the dielectric resonator. It is characterized in that the arrangement angle of the partial cutouts of the at least two dielectric resonance elements is changed by rotating the body resonance element. Further, the arrangement of the dielectric resonant element provided with the partial cutout in the dielectric resonator may be changed.

[0008]

The dielectric resonator of the present invention is constructed by stacking a plurality of dielectric resonant elements so that the lines of magnetic force cross each dielectric resonant element, and at least two of the dielectric resonant elements are provided with partial cutouts. There is. In such a dielectric resonator, in the case of adjusting the resonance frequency of the dielectric resonator, for example, by rotating the dielectric resonator element provided with a partial cutout,
The effective permittivity of the dielectric resonator is changed by adjusting the angles formed by the partial cutouts provided in the two or more dielectric resonant elements. For this reason, the conventional simple cylindrical dielectric resonator was installed.

[Outer 1] (Hereinafter referred to as “TE ₀₁ δ”.) Like a mode dielectric resonator, the maximum strength is near the center of the dielectric resonator,
It is possible to easily obtain the minimum electric field intensity distribution at both ends of the dielectric resonator, and reduce the resistance loss due to the current flowing in the shield case near both ends of the dielectric resonator. Therefore, in the dielectric resonator of the present invention, it is possible to prevent the unloaded Q from decreasing and to easily adjust the resonance frequency of the dielectric resonator.

Further, the effective permittivity of the dielectric resonator can be changed by changing the arrangement of the dielectric resonator element provided with the partial cutout in the dielectric resonator.
The resonant frequency of the dielectric resonator can be easily adjusted without lowering the unloaded Q.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway schematic perspective view of a dielectric resonator 1 according to an embodiment of the present invention. This dielectric resonator 1 has a TE ₀₁ δ mode (where δ is 0 <δ
<1. 2), the cylindrical dielectric resonator 3 is fixed on the support base 2 and is housed in the shield case 4 in a vertically symmetrical arrangement. FIG. 2 is a side view of the dielectric resonator 3 housed in the dielectric resonator 1. The dielectric resonator 3 includes five dielectric resonator elements 3a, 3b, ..., 3e. It is composed of layers. The five dielectric resonant elements 3a, 3b, ...
... 3 dielectric resonant elements 3c, 3d, 3e in 3e
Are formed in a disk shape of the same size with a hole 5 opened in the center. The remaining two dielectric resonant elements 3a,
3b is formed in a disk shape having the same size as the three dielectric resonant elements 3c, 3d, 3e.
As shown in FIG. 3, a hole 5 is formed in the center of the. Further, in the dielectric resonance element 3a, a direction crossing the line of electric force generated in the dielectric resonance element 3, that is, the dielectric resonance element 3a.
Eight vertical cuts 6a from the front to the back of the
However, they are provided radially at equal intervals of 45 ° toward the outer peripheral direction, and the dielectric resonance element 3b is also provided with eight cuts 6b that vertically penetrate from the front surface to the back surface. The two dielectric resonant elements 3a and 3b are shown in FIG.
As shown in (a), the cuts 6a and 6b are overlapped with each other, and the other three dielectric resonant elements 3 are stacked.
The dielectric resonator 3 is formed as shown in FIG. 4 (b) by stacking together with c, 3d and 3e.

In this dielectric resonator 3, one of the two dielectric resonant elements 3a and 3b is rotated to form two dielectric resonant elements 3a and 3b. Angle θ formed by the cuts 6a and 6b provided
The resonance frequency of the dielectric resonator 1 can be adjusted by changing. For example, as shown in FIGS. 5A and 5B, one of the two dielectric resonant elements 3a and 3b is rotated by θ to form the dielectric resonant element 3. can do. FIG. 6 shows the relationship between the angle formed by the cuts 6a and 6b provided in the two dielectric resonance elements 3a and 3b and the resonance frequency of the dielectric resonator 1. As shown in FIG. 6 (a),
Assuming that the angle formed by the cuts 6a and 6b provided on the two dielectric resonant elements 3a and 3b is θ, when θ = 0 °, that is, as shown in FIG. When the cut 6a and the cut 6b of the lower dielectric resonant element 3b completely overlap, the effective dielectric constant becomes the smallest, and the resonant frequency of the dielectric resonator 1 becomes the largest. Then, when any one of the dielectric resonant elements, for example, the upper dielectric resonant element 3a is rotated to change the angle θ formed by the cuts 6a and 6b, the resonant frequency gradually decreases, When the angle θ = 22.5 ° formed by the cuts 6a and 6b of the dielectric resonant elements 3a and 3b, that is, the cut 6a of the two dielectric resonant elements 3a and 3b,
It becomes the smallest when 6b is the farthest. Further, as the upper dielectric resonance element 3a is rotated, the resonance frequency gradually increases, and when the angle θ = 45 ° formed by the cuts 6a and 6b of the two dielectric resonance elements 3a and 3b, that is, again. When the cuts 6a and 6b completely overlap, the resonance frequency becomes the original resonance frequency again.

Due to the two dielectric resonant elements 3a and 3b having the cuts 6a and 6b, the effective dielectric constant of the dielectric resonant element 3 is changed by rotating the dielectric resonant element 3a. A change occurs in the electric field intensity distribution of the dielectric resonator 3. Moreover, unlike the case of polishing, the dimension of the dielectric resonator does not change and the center of gravity of the dielectric resonator in the shield case does not deviate from the center of the shield case. Therefore, there is almost no increase in resistance loss in the shield case 4, and complicated polishing work as in the conventional case is unnecessary,
Moreover, the resonance frequency of the dielectric resonator 1 can be easily adjusted without substantially reducing the unloaded Q.

FIG. 7 shows two dielectric resonance elements 3a and 3b.
The relationship between the angle θ formed by the cuts 6a and 6b and the positions in the axial direction of the two dielectric resonant elements 3a and 3b and the resonant frequency is shown. As shown in FIG. 7A, the five dielectric resonant elements 3 constituting the dielectric resonant body 3
The vertical positions of a, 3b, 3c, 3d, and 3e are A, B, C, D, and E in order from the top. Further, the horizontal axis of FIG. 7 (b) indicates the cut 6 of each of the two dielectric resonant elements 3a and 3b.
The angle θ formed by a and 6b represents the amount of change in the resonance frequency of the dielectric resonator 1 depending on the angle θ. Figure 7
Curves (a), (b), (c), and (d) shown in (b) respectively arrange the dielectric elements 3a and 3b at the positions A and B, A and C, A and D, and A and E, respectively. Dielectric resonance element 3
a or the dielectric resonance element 3b is rotated to make two cuts 6
The change in the resonance frequency when the angle θ formed by a and 6b is changed is shown.

As shown by the curve a, when the two dielectric resonance elements 3a and 3b are arranged at the positions A and B, that is, when the two dielectric resonance elements 3a and 3b are continuously arranged, two cuts 6a and 6b are formed. The resonance frequency is most greatly reduced when is shifted most (Fig. 6 (b)). Next, the resonator dielectric element 3a
One resonator dielectric element 3c having no break is sandwiched between the resonator dielectric element 3b and the resonator dielectric element 3b, and the resonator dielectric elements 3c are arranged at positions A and C in FIG. 7A. Further, when the angle θ formed by the cuts 6a and 6b is changed, the resonance frequency also changes, but the change amount is smaller than that in the case where the resonance frequencies are arranged at the positions A and B. further,
The distance between the two dielectric resonant elements 3a and 3b is gradually increased by moving the dielectric resonant element 3a and the dielectric resonant element 3b to positions A and D and positions A and E shown in FIG. 7A, respectively. And place it. When the dielectric resonance element 3a or 3b is rotated to change the angle θ formed by the cuts 6a and 6b as shown by the curves C and D, the change in the resonance frequency becomes gradually smaller, and the positions of A and E become smaller. When the dielectric resonant elements 3a and 3b provided with the cuts 6a and 6b are arranged in the above, the resonant frequency hardly changes even if any one of the dielectric resonant elements 3a and 3b is rotated.

As described above, the effective dielectric constant of the dielectric resonator 3 is also changed by configuring the dielectric resonator 3 by changing the arrangement positions of the dielectric resonant elements 3a and 3b provided with the cuts 6a and 6b. Therefore, the resonance frequency of the dielectric resonator 1 can be easily changed without lowering Q.

In addition, the dielectric resonator 3 is formed by using a large number of dielectric resonant elements forming the dielectric resonator 3, changing the number of cuts, or using three or more dielectric resonant elements provided with cuts. It may be configured.

FIG. 8 is a perspective view of a dielectric resonance element 3f used in a dielectric resonator 1 according to another embodiment of the present invention. The dielectric resonant element 3f is provided with eight cutouts 7 that penetrate vertically from the front surface to the rear surface of the dielectric resonant element 3f at equal intervals in a radial pattern. Similar to the first embodiment shown in FIGS. 4 and 5, two or more dielectric resonator elements 3f provided with such cutouts 7 are stacked to form the dielectric resonator 3 and the dielectric resonator 3 is formed. The resonance frequency may be adjusted by rotating the resonance element 3f.

Further, as shown in FIG. 9, the dielectric resonance element 3
Notches or notches 8 may be provided in a space from the front surface to the back surface of g. Also, as shown in FIG.
It is also possible to provide a notch or a notch on the rear surface of the dielectric resonant element 3h, which is cut off from the front surface, to form a water wheel.

FIG. 11 and FIG. 12 are perspective views showing the dielectric resonant element 3i and the dielectric resonant element 3j, which are still another embodiment. The recess 10 is provided, and the dielectric resonance element 3 is also provided.
A hole 11 penetrating from the front surface to the back surface may be provided in j.

In this embodiment, the TE ₀₁ δ mode dielectric resonator has been described, but the present invention can be applied to dielectric resonators of other modes. Further, the shape of the dielectric resonator is not limited to a cylinder, but can be a cylinder or a prism.

[0021]

According to the dielectric resonator and the method for adjusting the resonance frequency of the dielectric resonator of the present invention, the resonance frequency of the dielectric resonator can be easily adjusted with almost no decrease in the no-load Q. You can

[Brief description of drawings]

FIG. 1 is a partially cutaway schematic perspective view of a dielectric resonator according to an embodiment of the present invention.

FIG. 2 is a schematic side view showing a dielectric resonator of the above dielectric resonator.

FIG. 3 is a perspective view showing a dielectric resonance element forming the above dielectric resonator.

FIG. 4A is a view showing a state in which two cuts of the dielectric resonant element of FIG.
(B) is a side view showing the above-mentioned dielectric resonator in which the dielectric resonator element of (a) is stacked on another dielectric resonator element.

5A is a diagram showing a state in which two dielectric resonant elements of FIG. 3A are arranged without overlapping the cuts,
(B) is a side view showing the above-mentioned dielectric resonator in which the dielectric resonator element of (a) is stacked on another dielectric resonator element.

FIG. 6 (a) shows a structure in which two dielectric resonant elements are provided with 2
The figure which shows the angle (theta) which two breaks make, (b) is a figure which shows the relationship between the angle (theta) which the breaks shown in (a) make, and the resonance frequency of a dielectric resonator.

FIG. 7A is an explanatory view showing an arrangement position of a dielectric resonance element having a cut, and FIG. 7B is an arrangement position of two dielectric resonance elements and provided on two dielectric resonance elements. It is a figure which shows the relationship between the angle which two cut | disconnections make, and the variation | change_quantity of the resonant frequency of a dielectric resonator.

FIG. 8 is a perspective view of a dielectric resonance element forming a dielectric resonator of a dielectric resonator according to another embodiment of the present invention.

FIG. 9 is a perspective view of a dielectric resonance element forming a dielectric resonator of a dielectric resonator according to still another embodiment of the present invention.

FIG. 10 is a perspective view of a dielectric resonance element forming a dielectric resonator of a dielectric resonator which is another embodiment of the present invention.

FIG. 11 is a perspective view of a dielectric resonator element that constitutes a dielectric resonator of a dielectric resonator that is another embodiment of the present invention.

FIG. 12 is a perspective view of a dielectric resonance element forming a dielectric resonator of a dielectric resonator according to still another embodiment of the present invention.

[Explanation of symbols]

3 Dielectric resonator 3a, 3b Dielectric resonance element provided with cuts 3c, 3d, 3e Dielectric resonance element without break 4 shield case 6a, 6b break 7 Notch 11 holes

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-5-102714 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01P 7/10

Claims (3)

(57) [Claims] 1. A dielectric resonator including a dielectric resonator, wherein the dielectric resonator is formed by stacking a plurality of dielectric resonant elements so that lines of magnetic force cross each dielectric resonant element. At least two or more of the dielectric resonator elements are provided with partial cutouts such as notches, cuts, holes, and recesses. 2. A method for adjusting a resonance frequency of a dielectric resonator according to claim 1, wherein the dielectric resonance element provided with the partial cutout portion is rotated to rotate the dielectric resonance element. A resonance frequency adjusting method for a dielectric resonator, characterized in that an arrangement angle between partial cutouts of a resonance element is changed. 3. A method for adjusting the resonance frequency of the dielectric resonator according to claim 1, wherein the arrangement of the dielectric resonance element having the partial cutout in the dielectric resonator is changed. And a method for adjusting a resonance frequency of a dielectric resonator.