JPH0134485B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frequency adjustment mechanism for a dielectric resonator and a frequency adjustment method thereof.

As shown in Fig. 1, a conventional dielectric resonator a intended for the microwave region has a dielectric resonator element b.
There is one that has a sealed structure by placing it inside a case c consisting of a base d and a cover e. The conventional cover e has a flat top part _e1 , a circumferential side part _e2 perpendicular to the _top part e1, and a mounting part _e3 extending outward from the bottom of the circumferential side part _e2 , and has an almost inverted U-shaped cross section. is formed.

Incidentally, in such a dielectric resonator a, fine adjustment of its frequency may be necessary. Conventionally, in order to fine-tune the frequency, for example, to increase the frequency, the top part _e1 of the cover e is deformed by hitting it to an extent that does not damage the top part _e1 and the dielectric resonant element b.
shorten the distance between you and Conversely, when lowering the frequency, press the corner g, which is the boundary between the top e ₁ and the peripheral side e ₂ of the cover e, from both sides in the direction shown by the arrows B ₁ and B ₂ to lower the top e ₁ . It is deformed so as to shift upward, and the distance between the top part _e1 and the dielectric resonant element b is increased. However, the conventional cover e
However, due to its structure, the range of frequencies that can be adjusted is narrow and can only be adjusted to a few MHz. Further, if an attempt is made to make a larger change than that, there will be a problem that the case e itself will be damaged. Furthermore, when force is applied to the cover e for frequency adjustment, the conventional cover e is difficult to deform, making it difficult to finely adjust the frequency.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to make it possible to greatly change the frequency and to facilitate frequency adjustment.

In order to achieve such objectives, the present invention has the following features:
A dielectric resonant element is housed in a case consisting of a cover attached to a base, the base has an input/output member electrically coupled to the dielectric resonant element, and the cover is cap-shaped and has a top portion and a peripheral side. In a dielectric resonator having a part integrally with a part, a frequency adjustment part is formed by bending or curving a part of the top or circumferential part of the cover so as to protrude outward; By pressing a portion and changing the degree of bending or curvature of the frequency adjustment portion, the distance between the dielectric resonant element and the top of the cover is changed to adjust the frequency.

Hereinafter, the present invention will be explained in detail based on an embodiment shown in FIGS. 2 and 3.

FIG. 2 is a sectional view of a dielectric resonator according to the present invention. The dielectric resonator 1 of this embodiment includes a dielectric resonator element 2. This dielectric resonant element 2 is an oscillation element for TE ₀₁ δ mode microwave oscillation, which has a cylindrical outer shape. The dielectric resonant element 2 is housed in a case 4 formed by attaching a metal cover 8 to a base 6. That is, dielectric resonant element 2
is fixed on a substrate 12 on which strip lines for electrically coupling the dielectric resonant element 2 are formed via a spacer 10 made of forsterite or the like, and this substrate 12 is further fixed on the base 6. ing. The dielectric resonant element 2 is covered with a cover 8 with a predetermined space 14 in between. This cover 8 has a flat top portion 8a and a flat top portion 8a.
A circumferential side portion 8b and a circumferential side portion 8b extending upward and downward in the figure from a.
A portion of the peripheral side portion 8b is bent at a predetermined angle θ over the entire circumference to form a frequency adjustment portion 16. A mounting portion 8c of the cover 8 is fixed to the base 6 by a hermetic seal 18. Note that 20a and 20a are dielectric resonant elements 2
This is a lead wire that electrically connects to the

A method for adjusting the resonant frequency in the dielectric resonator 1 having the above configuration will be explained.

If the resonant frequency of the dielectric resonator 1 is lower than a predetermined value, the top portion 8a of the cover 8 is pressed from above in the direction indicated by the arrow _A1 to further bend and deform the frequency adjustment portion 16. As a result, the top portion 8a approaches the dielectric resonant element 2, and the distance between both 2 and 8a becomes shorter, so that the resonant frequency increases. Conversely, if the resonant frequency of the dielectric resonator 1 is higher than the predetermined value, press the frequency adjustment part 16 of the cover 8 from both sides in the directions indicated by arrows A ₁ and A ₂ so that the angle θ becomes smaller. Transform. As a result, the top portion 8a is separated from the dielectric resonant element 2, and the distance between both 2 and 8a becomes longer, so that the resonant frequency decreases. By adjusting the frequency of the dielectric resonator 1 in this manner, it is set to a predetermined value.

In the above embodiment, the frequency adjusting section 16 is provided at one location on the circumferential side portion 8b of the cover 8, but as shown in FIG. 3a, the frequency adjusting section 30, 32 may be provided at a plurality of locations. Furthermore, the frequency adjustment section 40 can be provided not only on the circumferential side portion 8b but also on the top of the cover as shown in FIG. 3b. In this case too,
By pressing the top of the cover, the frequency adjustment section 40 is deformed and the top approaches the dielectric resonant element, or by pressing the circumferential side of the cover from both sides, the frequency adjustment section 40 is deformed and its top is moved closer to the dielectric resonance element. By separating the top from the dielectric resonant element, the resonant frequency can be adjusted up or down. Furthermore, as shown in FIG. 3c, the frequency adjustment portion 50 may be formed by curving the top or side portions of the cover.

As described above, according to the present invention, the frequency adjustment part is formed by bending or curving a part of the top part or the circumferential part of the cover so as to protrude outward in a convex shape. By pressing the
The degree of bending or curvature of the frequency adjustment section can be easily increased or decreased, and the frequency can be easily adjusted in the increasing or decreasing direction. It can be changed significantly. Therefore, it becomes possible to adjust the frequency over a large range, for example, over ±10 MHz. Furthermore, since the frequency adjustment section is easily deformed when adjusting the frequency, the cover will not be inadvertently damaged. Furthermore, since the frequency is adjusted by pressing a part of the cover to change the degree of bending or curvature of the frequency adjustment section, excellent effects such as fine adjustment of the frequency are further facilitated.

Note that the entire cover is deformed by changing the degree of bending or curving of the frequency adjustment section, but in the dielectric resonator of the present invention, input/output members such as striplines and lead wires are not included in the cover. Since it is mounted on a separate base, the relative positional relationship between this input/output member and the dielectric resonator is maintained constant without being affected by the deformation of the cover, and the signal can be input without any problem even after frequency adjustment. Can output.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional dielectric resonator, Figure 2 is a cross-sectional view of a conventional dielectric resonator.
3 and 3 show an embodiment of the present invention, FIG. 2 is a sectional view of a dielectric resonator, and FIG. 3 is a partially omitted sectional view showing another modification of the cover. 1... Dielectric resonator, 2... Dielectric resonant element, 4...
case, 6...base, 8...cover, 8a...top,
8b...peripheral side part, 16, 30, 32, 40, 50...
Frequency adjustment section.

Claims (1)

[Claims] 1. A dielectric resonant element is housed in a case including a cover attached to a base, the base has an input/output member electrically coupled to the dielectric resonant element, and the cover is A frequency adjustment mechanism for a dielectric resonator that is cap-shaped and integrally has a top part and a circumferential side part, wherein the top part or the circumferential part of the cover is bent so that a part thereof protrudes outward. Alternatively, a frequency adjustment mechanism for a dielectric resonator, characterized in that the frequency adjustment portion is curved. 2. A dielectric resonant element is housed in a case consisting of a cover attached to a base, the base is provided with an input/output member electrically coupled to the dielectric resonant element, and the cover has a top portion and a circumferential side portion. A frequency adjusting part is formed by bending or curving a part of the top or circumferential part of the cover so as to protrude outward, and pressing a part of the cover. The frequency of a dielectric resonator is characterized in that the frequency is adjusted by changing the distance between the dielectric resonator element and the top of the cover by changing the degree of bending or curvature of the frequency adjustment part. Adjustment method.