JPH07142913A - Dielectric resonator - Google Patents

Abstract

PURPOSE:To reduce the effective dielectric constant of an area where the electric field of spurious vibration occurs by providing a notch so that it is positioned on almost the same periphery in a dielectric resonance element. CONSTITUTION:The dielectric resonance element 3 is formed by machining a columnar dielectric. A peripheral area at the upper end part of the dielectric forming the dielectric resonance element 3 is cut by lathe so that the cross section form of the peripheral area 5 becomes rectangular. Namely, a notch part 6 is provided on the outer peripheral area of the upper end part of the dielectric resonance element 3, and the dielectric resonance element is formed in a convexed cross section form. Thus, the electromagnetic field of a TE01(1+delta) mode is generated in an area where the notch part 6 of the dielectric resonance element 3 is formed. Thus, the resonance frequency f01(1+delta) of the TE01(1+delta) mode is detached from the resonance frequency f01(1+delta) of the TE01delta mode, and the unnecessary electromagnetic wave of the resonance frequency f01(1+delta) at the TE01(1+delta) mode can efficiently be cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a dielectric resonator.
Specifically, it relates to a technique for dispersing spurious of a dielectric resonator.

[0002]

2. Description of the Related Art Conventionally,

[Outside 2] Mode (0 <δ <1) (hereinafter referred to as “TE ₀₁ δ mode”) in a dielectric resonator

[Outside 3] A method called (Frmax) design is a method for dispersing spurious in a mode (hereinafter referred to as “TE _{01 (1 +} δ ₎ mode”). In the (Frmax) design, the resonance frequency of the mode of interest is fo and the resonance frequency of the higher-order mode is fr, and the dielectric resonator is designed by numerical calculation so that the resonance frequency ratio Fr = fr / fo is maximized. Is the way.

[0003]

However, (Fr
If it is attempted to sufficiently disperse the spurious by max) design, the shape of the dielectric resonant element housed in the dielectric resonator becomes very complicated and its manufacture becomes very difficult. Further, the shape of the conductor case for accommodating the dielectric resonance element is complicated, and the no-load Q of the dielectric resonator is likely to be reduced. In addition, the dielectric resonator element may be left in a simple shape such as a cylindrical shape or a cylindrical shape (Frma
x) When designed, there was a limit to the dispersion of spurious.

The present invention has been made in view of the drawbacks of the above conventional examples, and an object of the present invention is to achieve the TE _{01 (1 +} δ ₎ mode without impairing the productivity of the dielectric resonant element. The resonance frequency f _{01 (1+} δ ₎ is the resonance frequency f of the TE ₀₁ δ mode.
It is to increase the dispersion of the spurious of the dielectric resonator by moving away from ₀₁ δ.

[0005]

A dielectric resonator of the present invention is a TE ₀₁ δ mode dielectric resonator including a dielectric resonant element, wherein the end faces of the dielectric resonant element are arranged on substantially the same circumference. It is characterized in that a notch or a recess is provided so as to be located.

The cutouts or recesses may be provided substantially rotationally symmetrical with respect to the longitudinal axis of the dielectric resonant element.

[0007]

[Function] By providing a notch or a recess on the end face of the TE ₀₁ δ-mode dielectric resonant element so as to be located on substantially the same circumference, an electric field of spurious vibrations in the TE _{01 (1+} δ ₎ mode is generated. It is possible to reduce the effective permittivity of the existing region, and it is possible to disperse the resonance frequency of the spurious in a frequency range apart from the resonance frequency of the TE ₀₁ δ mode. For this purpose, the notch or the recess may be provided rotationally symmetrically with respect to the longitudinal axis of the dielectric resonant element.

In such a dielectric resonator, since it is only necessary to change the shape of the dielectric resonance element, it is not necessary to make the conductor case in a complicated shape and the no-load Q is not lowered.

Further, since only the notch or the recess is provided on the end face of the dielectric resonant element, the dielectric resonant element can be produced by a simple manufacturing method such as cutting, pressing or integral molding, and the dielectric resonant element can be produced. It does not impair the device productivity.

[0010]

FIG. 1 is a partially broken perspective view of a TE ₀₁ δ-mode dielectric resonator 1 of the present invention, in which a substantially cylindrical dielectric resonator element 3 is fixed on a support 2 and is shielded. It is housed in Case 4. 2A is a perspective view showing the dielectric resonant element 3, and FIG. 2B is a sectional view thereof. The dielectric resonance element 3 is formed by cutting a cylindrical dielectric body, and forms a peripheral area of the upper end portion of the dielectric body forming the dielectric resonance element 3 (see FIG. 2).
A region 5 surrounded by a broken line in (b) is cut by a lathe or the like so that the peripheral region 5 has a rectangular sectional shape. That is, as shown in FIG. 2A, the notch 6 is provided in the outer peripheral area of the upper end of the dielectric resonant element 3, and the cross section of the dielectric resonant element 3 is convex as shown in FIG. 2B. It is formed into a shape. In the dielectric resonator 1 containing such a dielectric resonant element 3, a TE _{01 (1 +} δ ₎ mode electromagnetic field is generated in the region where the cutout portion 6 of the dielectric resonant element 3 is provided. . Therefore, TE _{01 (1+ δ)} mode resonance frequency f _{01 (1+ δ)} a TE ₀₁ [delta] mode - away from de resonance frequency f ₀₁ [delta], unnecessary in TE ₀₁ [delta] mode dielectric resonator TE The electromagnetic wave having the resonance frequency f _{01 (1 +} δ ₎ of the _{01 ( 1 +} δ ₎ mode can be efficiently cut, and the spurious of the dielectric resonator 1 can be improved. Further, since the dielectric resonant element 3 can be easily formed by cutting a cylindrical dielectric or pressing or integrally molding, the productivity of the dielectric resonant element 3 does not decrease.

FIG. 3 is a cross-sectional view showing the dielectric resonant element 3 of the dielectric resonator 1 according to another embodiment of the present invention, which is a cylindrical dielectric resonant element 3. An annular groove 7 is provided in the inner peripheral area of the upper end portion. Even in this dielectric resonance element 3, since the groove 7 which is a recess is provided in the end face, spurious of the dielectric resonance element 3 can be improved. Further, the dielectric resonant element 3 can be easily manufactured by cutting the groove 7 in the cylindrical dielectric.

4 (a) to 4 (c) are sectional views of a dielectric resonant element 3 which is still another embodiment. As shown in FIG. 4A, the inclined surface 8 is provided in the peripheral edge region 5 of the upper end of the cylindrical dielectric for forming the dielectric resonant element 3, and the sectional shape of the peripheral edge region 5 of the dielectric resonant element 3 is provided. It is also possible to continuously cut the upper end of the cylindrical dielectric so as to form a triangle to form the notch 6 and form the end of the dielectric resonant element 3 into a truncated cone shape. Further, as shown in FIG. 4B, the peripheral regions 5 at the upper end and the lower end of the cylindrical dielectric are cut into a rectangular cross section, respectively, and the outer peripheral regions of the upper end and the lower end of the dielectric resonant element 3 are cut. The notch 6 may be provided in the. Further, as shown in FIG. 4C, a stepped notch 6 may be provided in the peripheral region 5 of the dielectric resonant element 3.

A dielectric resonant element 3 according to another embodiment.
Is shown in FIGS. 5 (a) and 5 (b). FIG. 5A is a perspective view thereof,
8B is a cross-sectional view thereof, in which eight cutout portions 6 having a rectangular cross section are provided at equal intervals along the periphery of the upper end of the dielectric resonance element 3. Further, in the peripheral region 5 at the lower end of the dielectric resonance element 3, eight cutouts 6 having a rectangular cross section are provided at equal intervals. As described above, even if the several notches 6 are provided in the peripheral edge of the upper end portion of the dielectric resonant element 3 in axial symmetry, the spurious of the dielectric resonator 1 can be easily improved. Further, the notch 6 can be easily provided by cutting a cylindrical dielectric. Furthermore, since the dielectric resonant element 3 provided with the cutout portion 6 can be formed by integral molding, the productivity of the dielectric resonant element 3 is not impaired.

Further, as shown in FIG. 6, the notch 6 may be provided in the cylindrical dielectric resonant element 3 having the hole 9 at the center. Further, in addition to these examples, the dielectric resonant element 3 of various shapes can be formed by processing the corner portion of the cutout portion 6 and the inclined surface 8 of the upper end portion of the dielectric resonant element 3 into a curved shape. .

[0015]

In the dielectric resonator of the present invention, the dielectric resonator element is provided with a notch or a recess so as to be located on substantially the same circumference, and a simple shape such as a cylindrical shape or a cylindrical shape is maintained. Thus, the resonance frequency of the TE _{01 (1 +} δ ₎ mode can be further separated from the resonance frequency of the TE ₀₁ δ mode. Therefore, the productivity of the dielectric resonator is not impaired and the no-load Q is not reduced.

[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 (a) is a perspective view of a dielectric resonance element housed in the same dielectric resonator, and FIG. 2 (b) is a sectional view thereof.

FIG. 3 is a cross-sectional view of a dielectric resonance element housed in a dielectric resonator that is another embodiment of the present invention.

4 (a), (b) and (c) are cross-sectional views of a dielectric resonant element which is still another embodiment of the present invention.

5A is a perspective view of a dielectric resonant element according to still another embodiment of the present invention, and FIG. 5B is a sectional view thereof.

FIG. 6 is a perspective view of a dielectric resonant element housed in a dielectric resonator which is another embodiment of the present invention.

[Explanation of symbols]

 3 Dielectric Resonance Element 5 Peripheral Area 6 Notch 7 Groove 8 Slope

Claims (2)

[Claims] 1. A dielectric resonance element is included. In a mode dielectric resonator, a cutout or a recess is provided on an end surface of the dielectric resonance element so as to be located on substantially the same circumference, a dielectric resonator. 2. The dielectric resonator according to claim 1, wherein the notch or the recess is provided substantially rotationally symmetrical with respect to the longitudinal axis of the dielectric resonant element.