JPH047905A - Dielectric resonator - Google Patents

Abstract

PURPOSE:To make the resonator small, to enhance the air-tightness, to facilitate the adjustment of a resonance frequency and to eliminate the frequency deviation after the adjustment by applying an external force to a bent part so as to be deformed. CONSTITUTION:A bent part 16 able to be deformed is provided on a side wall of a metallic shield case 7 and when an external force is exerted to an upper face of the case 7, the bent part 16 is deformed resulting that a distance between the upper face of the case 7 and the dielectric body 3 is changed. An external force is exerted to the case 7 to deform the bent part 16 and to adjust the distance between the upper face of the case 7 and the dielectric body 3 thereby matching a resonance frequency of the dielectric resonator or the oscillating frequency of a dielectric oscillator with an object frequency.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a dielectric resonator, and particularly relates to an improvement in a means for adjusting the resonant frequency thereof. After deforming it by applying an external force to adjust the resonance frequency, by fixing both ends of the plate member to both side walls of this bent part and fixing the interval between the both side walls,
It is designed to be smaller and easier to adjust. [Prior Art] Adjustment of the resonant frequency of a dielectric resonator is usually carried out by utilizing the property that the resonant frequency increases as the metal part approaches the dielectric.

[, Ru. J] - Figures 1 to 14 1 and 1 show a conventional method for adjusting the resonant frequency of a dielectric resonator. In these drawings, 1 is a screw, 2 is a nut, 3 is a dielectric, 4 is a spacer, 5 is a substrate, 6 is a stamp line, ゛l is a metal shield case, 8 is a metal bottom plate 7g i
t,, fpj section, ]0 is groove, 1], t1 presser, 12
is an adjustment jig, 13 is the outer metal case, J4 is the inner &
I5 has a spring part 1. q 1. In the case of the dielectric resonator 4, the dielectric 3 is placed on the substrate 5 which is fixed to the metal bottom plate 7 of the metal shields . When installed, a lip line 6 is formed, which is magnetically coupled to the adjacent line C.
, there are holes on the top of the case 7 +, -t i'gi
9-L: Through the nut 2 (4+'; 4-row pitcher S can be inserted), the dielectric 3 faces the dielectric 3 (5), and at the foot of the screw insertion, the resonant frequency Do the 11th step of
: After making the adjustment, 3. Make sure that screw 1 is not heavy, L, and 5. Tighten SANO F-2 to fix screw 1. Since the dielectric resonator shown in FIG. 11 has a relatively simple structure, it is currently widely used. Figures 12 and 13 show a recess 9 formed by recessing the opposing portion of the dielectric 3F on the upper surface of the metal shielding case 7 [1. By changing the distance between the dielectric 3 and the upper surface of the A body resonator that adjusts the resonance B wave number by adjusting the resonance B wave number?゛AΦ. The method for forming the recess 9 is shown in Figure 3.
There is a way to dent the manifold case '7 by tightening the holder 1 of the adjustment jig 412 (2).
, /7-, -S '7', The inner side of one corner is easily deformed.The groove 10: 10 yen: square shape I9 is immersed in the 1st corner.
4 No. 140 has a metal shield case with a double structure of an inner metal case 14 and outer metal cases 1 and 3, and the side wall of the inner metal case 14 has a nozzle. Corner part 1
b is formed. Insert the screw 1 into the screw hole on the upper surface of the outer metal case 13 to make it dirty. It is possible to adjust the resonant frequency by bringing it closer to 3. [Problems to be Solved by the Invention] However, the above-mentioned conventional dielectric resonator has the following problems. First, in the structure shown in Figure 11, screw 1 is in case 7.
When mounting the resonator, it is necessary to provide sufficient space in the height direction of the resonator in order to fix the screw (which protrudes in two parts) using nut 2 and adjust the insertion length of screw 1. . Currently, dielectric resonators are used as local oscillators, ie, dielectric oscillators, in down converters for home satellite broadcast reception, and therefore, there is a need for small-sized dielectric resonators. However, when the oscillation frequency is adjusted using a resonant frequency adjustment mechanism as shown in FIG. 11, it is difficult to reduce the size in the height direction, which causes the size of the converter to increase. Furthermore, drilling screw holes in the metal shield case 7 reduces airtightness, causing fluctuations in oscillation frequency and deterioration of semiconductor elements due to intrusion of water vapor and the like. Furthermore, even if you adjust the insertion length of screw 1 to match the oscillation frequency to the specified value, when you try to fix screw 1 by turning nut 2, screw 1 will move slightly and the oscillation frequency will shift. Adjusting the oscillation frequency takes time and effort, which causes an increase in costs. Next, regarding the structure shown in FIGS. 12 and 13. Since the metal case 7 always has some elasticity, the presser 11
After adjusting the resonant frequency of the dielectric resonator or the oscillation frequency of the dielectric oscillator to a predetermined value by tightening the
If it is loosened, the deformed recess 9 will return to its original state and the frequency will shift. Furthermore, if the concave portion 9 is recessed too much and the frequency exceeds the target value, the frequency 14 cannot be lowered, so the adjustment work 5 must be performed carefully, which is very time-consuming. Furthermore, since the upper surface of the metal case 7 is made to be easily deformable, if an external impact is applied after one frequency has been adjusted, the top surface of the metal case 7 will deform and the frequency will shift. The structure shown in Fig. 14 has improved airtightness compared to the structure shown in Fig. 11, but because the metal case has a double structure, it becomes even larger, making it impractical. . Furthermore, the deviation in the frequency of FJ3 caused by the slight movement of the screw when the nut 2 is tightened cannot be improved. OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a dielectric resonator that is small, has high airtightness, is easy to adjust the resonant frequency, and has no frequency shift after adjustment, in order to solve the above-mentioned drawbacks of the conventional device. This is to do so. [Means for Solving the Problems] In order to achieve the above object, the dielectric resonator of the present invention has a metal shielding case with a deformable bending portion in one place, and the metal shielding case is provided with a deformable bending portion in one place, and the above-mentioned case and the inside of the case are In order to adjust the resonant frequency by changing the distance from the dielectric, the bent portion is deformed by applying an external force to the case number, and then predetermined plate-like members are attached to both side walls of the bent portion. The gist is that @ is fixed and the distance between the side walls of the bent part is fixed. [Function] It is sufficient to simply apply an external force to deform the bent part, and the metal case and the ten-sided part are trained. Since adjustment screws are not required, it can be made smaller, and since there is no screw hole, airtightness is improved.Since the deformation of the bent part is fixed, it is possible to reduce
There is no deviation of the 11th frequency due to the elasticity of the metal, making adjustment work easier. Also, the structure r: is strong against external impact [Examples] The present invention will be explained below with reference to the embodiments shown in the drawings. 1 to 4 show an embodiment of a dielectric resonator according to the present invention, and the same reference numerals as in FIG. 11 and -4 indicate similar members or parts. FIG. 1 shows the state before frequency adjustment, and at least part 1 of Q-metal shield cape 7. For example! 'i
! 1 wall is provided with a deformable bending portion 16, and the case 7
When an external force is applied in the direction of the arrow in the figure to the upper surface of the 1-segment by an appropriate method, the bent portion 16 becomes q-shaped, resulting in various structures in which the distance between the upper surface of the No. 1 spacer 7 and the dielectric 3 changes. It has become. The bent portion 16 can be deformed to suit the shape of the case. elongation, partial force j eruption, ? , Riki. It is desirable to form it thinly. The frequency adjustment procedure in this embodiment is as follows: First, an external force is applied to the shield case 7 in the direction of the arrow to deform the bent portion 16, and the distance between the dielectric 3 and the upper surface of the shield case 7 is adjusted to cause dielectric resonance. Adjust the resonant frequency of the device or the oscillation frequency of the dielectric oscillator to the target value. Next, both ends of the plate member 17 are soldered to both side walls 19°20 of the bent portion 16,
Fix by welding or adhesive 18.18'. Plate member 1
7 does not need to be made of metal, and one end of the side wall portion 1 is
It is best to keep it fixed at 9. At this time, the distance between the dielectric 3 and the upper surface of the case 7 is kept constant. When the external force is removed after the solder or adhesive 18, 18' has hardened, the one frequency adjustment operation is completed and the state as shown in FIG. 2 is obtained. In this way, the distance between the side walls of the bent portion 16 is fixed by the solder or adhesive 18, 18', thereby preventing the frequency shift due to the elasticity of the case when the external force is removed, which was a problem with the conventional device. The frequency can be easily adjusted to the target frequency.6 Also, since there is no need to use screws as in the conventional case, it is advantageous in terms of airtightness and miniaturization.7 Furthermore, FIG. FIG. 9 is an external perspective view of one embodiment. Note that even if too much external force is applied when adjusting the frequency and the frequency becomes higher than the target value, if the plate member 17 is Because of its elasticity, external forces can be relaxed and the frequency can be lowered. Also, even if no external force is applied by mistake, the frequency may become higher than the target S value.
If the bent part has been deformed to about ¥p:, insert a screwdriver or the like into the bent part 16 and push the bent part upward and downward as shown in Figure 4. The frequency will drop and the adjustment can be made again. FIGS. 5 and 6 show other embodiments of the present invention, in which the bent portion 16
is provided at the connecting portion between the metal shield case 7I-Dh surface portion and the side walls on both sides thereof, and the plate member 17 is fixed to each side wall portion 18 of the bent portion I6 on both sides across the upper surface portion thereof, Figure 5 is before adjustment. FIG. 6 shows the state after adjustment. 7 and 8 show a modified embodiment of the present invention, in which the bent portion 16 is connected to the lower side wall of the metal shield case 7 and the metal bottom plate 8.
Figure 7 shows before adjustment, and Figure 8 shows the
The figure shows the state after adjustment. In the above description, only one bent portion 16 is provided around the shield case 7, but it goes without saying that similar frequency adjustment is possible even if a plurality of bent portions are provided. Furthermore, the dielectric resonator of the present invention is not only a dielectric oscillator, but also
It can be applied to all devices using dielectric resonators such as various filters. 9 and 10 show an embodiment in which the present invention is applied to a bandpass filter using a plurality of dielectrics 3. A plate member 17 is fixed to all of the plurality of bent portions 16 of the metal shield case 7. [Effects of the Invention] As explained above, according to the present invention, there is no need to use screws as external force applying means for frequency adjustment, so miniaturization can be achieved and airtightness can be improved. Furthermore, since the distance between the side walls of the bent portion is fixed after being adjusted, no frequency shift occurs even if external force is removed, and the adjustment work is facilitated. Furthermore, since the distance between the side walls of the bent portion is fixed against external shocks, frequency shifts are less likely to occur.

[Brief explanation of drawings]

1 and 2 are schematic diagrams showing one embodiment of the present invention, FIGS. 3 and 4 are perspective views showing the external appearance, and FIGS. 5 to 8 are respectively other embodiments of the present invention. FIG. 9 is a schematic diagram showing still another embodiment of the present invention, FIG. 10 is a perspective view showing its appearance, and FIGS. 11 to 14 are schematic diagrams showing a conventional dielectric resonator. It is a diagram. 3......Dielectric, 7...Metal shield case. 8・・・・・・・・・Metal bottom plate, 16・・・・・・・・・
- Bent part, 17...Plate member. Patent Applicant Kyocera Corporation Agent Patent Attorney Nagai 1) Take 3 Part I, Ka Figure 1 Figure 2 Figure 3 Figure 4 Figure 10, + O a) N Figure 12

Claims (1)

[Scope of Claims] (1) A deformable bent portion is provided at at least one location of the metal shield case, and the resonant frequency is adjusted by changing the distance between the case and the dielectric within the case. After the bent portion is deformed by applying an external force to the case, both ends of a predetermined plate member are fixed to both side walls of the bent portion, thereby fixing the interval between the both side walls of the bent portion. dielectric resonator. (2) The dielectric resonator according to claim 1, wherein the bent portion is provided on a side wall portion of the case. (3) Claim (3) characterized in that the bent portion is provided at a connecting portion between the upper surface portion of the case and the side wall portions on both sides thereof.
The dielectric resonator described in 1). (4) Dielectric resonance according to claim (1), characterized in that a plurality of dielectrics are installed in the case, and a plurality of bending parts are provided in the case corresponding to each dielectric. vessel. (5) The dielectric resonator according to claim (3), wherein the plate-shaped member extends across the upper surface of the case and is fixed at both ends by side walls of bent portions on both sides thereof.