JPH07231220A - Frequency adjustment device for microwave oscillator - Google Patents

Abstract

PURPOSE:To facilitate a high frequency adjustment and to decrease frequency deviation by quickening the frequency adjustment for a low frequency region and decreasing a frequency change at adjustment in a high frequency region. CONSTITUTION:The microwave oscillator using a dielectric resonator 3 is provided with a conductor piece 4 arranged in a magnetic field of the dielectric resonator 3 and whose distance from the dielectric resonator 3 is made variable, an adjustment screw 6 placed on the surface of a shield case 1 and a correction section 5 correcting a movement of a tip of a screw by a pitch of the adjustment screw 6 to move the conductor piece 4. Then the correction section 5 provides a larger distance change more than a pitch of the adjustment screw 6 when the distance between the conductor piece 4 and the dielectric resonator 3 is apart and provides a smaller distance change more than a pitch of the adjustment screw 6 when the distance between the conductor piece 4 and the dielectric resonator 3 is close.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oscillator using a dielectric resonator, and more particularly to a frequency adjusting device for a microwave oscillator.

[0002]

2. Description of the Related Art A microwave oscillator used in a conventional satellite receiving antenna is shown in FIG.
2. Resonate 2 and electromagnetically couple to the microstrip line 21 disposed at a distance that allows electromagnetic coupling with the dielectric resonator 22, and amplify the electromagnetically coupled signal by the FET 23 or the like to form a feedback loop. I am trying to oscillate by. Since the dielectric resonator is a ceramic product, a slight manufacturing error occurs during firing, so that when the resonance frequency is ten and several GHz, the resonance frequency usually varies by several tens of MHz. Therefore, we prepared some standard dielectric resonators and adjusted the grinding so that the required frequency was achieved.However, the cost increases depending on the adjustment accuracy, so there is a variation of about 10 MHz. Things are generally used.

Therefore, the required oscillation frequency is 100 MHz
A dielectric resonator having a low resonance frequency is used, and a frequency adjusting screw 25 is inserted to bring the dielectric resonator 22 closer to the resonator, and the oscillation frequency is increased to a desired frequency for use. Has been. The frequency adjustment range with this frequency adjustment screw is generally oscillating frequency is over 10 GHz.
In the case of, there is a width of about 400 MHz. For example, in the case of creating two oscillators having different oscillation frequencies, if the mutual oscillation frequencies are about 50 MHz, the frequency adjustment range of the frequency adjustment screw has a width of about 400 MHz. It is possible to adjust and use the frequency adjustment screw by using one type of oscillator. Therefore, each type of dielectric resonator whose resonance frequency is lower than the required frequency by about 100 MHz is used, and one frequency oscillator is adjusted by adjusting the frequency adjustment screw. Adjust and create.

FIG. 5 is a characteristic diagram showing the characteristics of the amount of insertion of the frequency adjusting screw of the microwave oscillator and the frequency change. As shown in the figure, the amount of insertion of the frequency adjusting screw (L) increases, and the amount of change in the oscillation frequency increases rapidly when the tip of the frequency adjusting screw approaches the dielectric resonator. If one of the oscillators can be adjusted within the range of A in the figure, the oscillator with the higher frequency will be adjusted within the range of B of the figure. After adjusting in the range of A part, fix it with screw lock etc. after adjustment, and even if the frequency adjustment screw moves a little when the screw lock hardens, the frequency change stops within the allowable range and it can be used, but After adjusting the range, fix it with a screw lock etc. after adjustment, and if the frequency adjustment screw seems to move even if the screw lock hardens, the frequency change will be large and it will be out of the allowable range and it will be unusable. There was a problem such as. Therefore, two microwave oscillators have been produced by using dielectric resonators having different characteristics.

Further, when adjusting the frequency, finer adjustment is easier when the pitch of the adjusting screw is smaller, but if the pitch is too small, it is necessary to rotate the screw many times to adjust to the desired frequency. , Adjustment takes time. If the screw pitch is made coarse, fine adjustment becomes difficult, and further the frequency change when the screw moves after the adjustment becomes large. Therefore, even if the workability is impaired, the pitch of the screw is made fine to facilitate the fine adjustment of the frequency, and the frequency change is reduced even if the screw moves after the adjustment.

[0006]

Therefore, when the oscillating frequencies of the microwave oscillators are different, the dielectric resonators having different characteristics are used.
Further, even if the workability is impaired, the pitch of the screw is made fine, which causes a problem of high cost. The present invention corrects the movement of the tip of the screw due to the pitch of the screw and moves the conductor piece for frequency adjustment provided in the dielectric resonator with the corrected movement amount, thereby oscillating with respect to the insertion amount of the adjustment screw. By changing the change characteristics of the frequency so that the frequency adjustment work can be performed faster in the low frequency range and the frequency change at the time of adjustment is reduced in the high frequency range to facilitate the frequency adjustment work and Since it is possible to reduce the frequency deviation of the microwave oscillator, a frequency adjusting device for a microwave oscillator capable of producing a microwave oscillator having different oscillation frequencies by frequency adjustment using dielectric resonators having the same characteristics. The purpose is to provide.

[0007]

A frequency adjusting device for a microwave oscillator according to a first aspect of the present invention is a microwave oscillator using a dielectric resonator, wherein the frequency adjusting device is arranged in a magnetic field of the dielectric resonator, A conductor piece provided so that the distance to the container can be changed, an adjusting screw provided on the surface of the outer box, and a correction unit that moves the conductor piece by engaging with the adjusting screw. If the distance between the conductor piece and the dielectric resonator is large, the distance is changed significantly, and if the distance between the conductor piece and the dielectric resonator is close, the distance change is reduced so that it is corrected. It is characterized by doing. A frequency adjusting device for a microwave oscillator according to a second invention of the present application, at least the drive shaft portion in which the conductor piece is supported by an upper fixing portion of the dielectric resonator via an elastic body, and the drive shaft portion. It is characterized in that the surface facing the dielectric resonator is a conductor plate.

A frequency adjusting device for a microwave oscillator according to a third aspect of the present invention comprises a correcting tool provided on the ceiling of an outer box so that the correcting section is slidable in a horizontal direction, and is provided on a side surface of the correcting tool. The adjusting screw is engaged with the engaging portion so that the tip of the adjusting screw is idle, and the lower surface of the correcting tool is provided with an inclined surface, and the drive shaft portion of the conductor piece is abutted against the inclined surface. Then, the distance between the conductor plate and the dielectric resonator is adjusted by the inclination of the inclined surface. In the microwave oscillator frequency adjusting device according to the fourth aspect of the present invention, the inclination angle of the inclined surface is changed so that the inclination angle changes largely linearly on the one hand and small nonlinearly on the other hand. It is characterized by that.

[0009]

In the first aspect of the present invention, the distance between the conductor piece and the dielectric resonator is adjusted by correcting the movement of the screw tip due to the pitch of the adjusting screw by the correction unit. When the distance between the resonators is far, the distance should change more than the pitch of the adjusting screw, and when the distance between the conductor piece and the dielectric resonator is close, the distance change should be smaller than the pitch of the adjusting screw. Therefore, it is possible to quickly adjust the frequency to a desired frequency in the low frequency portion and reduce the frequency change in the high frequency portion, which facilitates the frequency adjustment work and has the same characteristics. It becomes possible to manufacture a microwave oscillator having different oscillation frequencies by adjusting the frequency using the dielectric resonator. In the second invention of the present application, a drive shaft portion in which the conductor piece is formed in the shape of a rod supported by a fixed portion above the dielectric resonator via an elastic body, and at least the dielectric body of the drive shaft portion. The distance between the conductor plate and the dielectric resonator is made up by driving the drive shaft part by compensating the movement of the tip of the adjusting screw by the compensating part. Can be adjusted,
It is possible to adjust the oscillation frequency of the microwave oscillator by changing the resonance frequency of the dielectric resonator.

In the third invention of the present application, a correcting tool is used as the correcting section, the correcting tool is provided on the ceiling of the outer box so as to be slidable in the horizontal direction, and the engaging section is provided on the side surface of the correcting tool. The adjusting screw is engaged with the engaging portion so that the tip of the adjusting screw rotates, an inclined surface is provided on the lower surface of the correction tool, and one end of the conductor piece is abutted against the inclined surface to rotate the adjusting screw. Therefore, the inclined surface is moved by the pitch of the screw, and the distance between the other end of the conductor piece and the dielectric resonator is adjusted by the inclination of the inclined surface. Therefore, the pitch of the screw is corrected. It is possible to adjust the oscillating frequency by means of this, and as shown in the fourth aspect of the present invention, the inclination angle of the inclined surface of the correction tool is changed so that one side is changed largely linearly and the other is set small and non-linear. It is formed so that it changes linearly. It is possible to adjust the frequency to a desired frequency quickly in the low number part, to reduce the frequency change in the high frequency part and to change the frequency almost linearly, which facilitates the frequency adjustment work. It will be possible.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining the principle of a frequency adjusting device for a microwave oscillator according to the present invention. An oscillating circuit composed of a microstrip line, an FET, etc. and a dielectric resonator 3 is formed on a dielectric substrate 2, and the dielectric substrate 2 is housed inside a shield case 1 forming an outer box. A through hole is provided in the shield case 1 and the adjusting screw 6 is inserted thereinto,
The tip of the adjusting screw 6 is engaged with the conductor piece 4 via the correcting portion 5, the other end of the conductor piece 4 is arranged in the magnetic field of the dielectric resonator 3, and the adjusting screw 6 is rotated to adjust the pitch of the screw. The tip of the adjusting screw 6 is moved, and the correcting portion 5 corrects the movement of the tip of the adjusting screw 6 to adjust the distance between the conductor piece 4 and the dielectric resonator 3. When the conductor piece 4 and the dielectric resonator 3 are separated from each other, the distance is changed to be larger than the pitch of the adjusting screw 6, and when the conductor piece 4 and the dielectric resonator 3 are close to each other, the adjusting screw is adjusted. The distance change is smaller than the pitch of 6, so that the low frequency part can be adjusted quickly to a desired frequency, and the high frequency part can reduce the frequency change. A microwave oscillator having different oscillation frequencies can be created by facilitating the work and adjusting the frequency by using the dielectric resonator 3 having the same characteristics.

FIG. 2 is a block diagram showing an embodiment of a frequency adjusting device for a microwave oscillator according to the present invention.
The same components as those indicated by are attached with the same symbols and the description thereof will be omitted. A flat plate 12 is used as the correction unit 5 in FIG. 1, and the flat plate 12 is provided with a groove 16 in the horizontal direction on the ceiling of the shield case 1, and a sliding piece 15 wider than the groove 16 is provided outside the shield case 1. The sliding piece 15 and the flat plate 12 are connected through the groove 16 so that the flat plate 12 can move in the horizontal direction. The flat plate 12 is provided with a substantially rectangular slit 17, and the slit 1 is provided inside the slit 17.
By providing a locking piece 18 shorter than the length of 7 in the longitudinal direction,
The locking piece 18 is allowed to rotate idly inside the slit 17, a through hole having a diameter larger than that of the adjusting screw 6 is provided on the side surface of the flat plate 12, and the tip of the adjusting screw 6 is engaged through the through hole. It is attached to the stop piece 18. Therefore, when the adjusting screw 6 is rotated, the flat plate 12 can be moved in the left and right directions.

An inclined surface is provided below the flat plate 12, the inclination angle of the inclined surface is changed, the inclined surface 13 is changed largely linearly, and the inclined surface 14 is changed small and non-linear. is doing. The drive shaft 8 is formed, for example, in a rod shape, a through hole is provided in the support plate 9 and is inserted below the through hole, the metal plate 7 is attached to the tip, and the metal plate 7 is positioned above the dielectric resonator 3. And a fixed piece 11 is provided on the upper part of the drive shaft 8 in a brim shape, and a spring 10 is provided between the fixed piece 11 and the support plate 9 to support the metal plate 7 with elasticity. ing. The upper part of the drive shaft 8 abuts on the inclined surface of the flat plate 12, and the inclination of the inclined surface causes the metal plate 7 to move.
The frequency of the microwave oscillator can be adjusted by changing the distance between the resonator and the dielectric resonator 3.

The shield case 1 is rotated by rotating the adjusting screw 6.
2A, the flat plate 12 slides to the left as shown in FIG. 2A, and the drive shaft 8 is pressed along the inclined surface 14. Therefore, the metal plate 7 and the dielectric resonator 3 And the oscillating frequency increases, but the inclined surface 14
By adjusting the degree of curvature of, the frequency of the microwave oscillator can be changed and adjusted at a substantially constant rate with respect to the rotation of the adjusting screw 6, and the amount of change in frequency can be reduced. Therefore, when the adjustment screw 6 is screw-locked after the adjustment, the frequency change can be reduced even if the adjustment screw 6 is slightly displaced, which facilitates the frequency adjustment work, and uses the dielectric resonator having the same characteristics to reduce the frequency. Adjustment makes it possible to create microwave oscillators having different oscillation frequencies. If the adjusting screw 6 is rotated and pulled out from the inside of the shield case 1,
As shown in (b), slide the flat plate 12 to the right to
Is held along the inclined surface 13, the distance between the metal plate 7 and the dielectric resonator 3 becomes large, and the oscillation frequency becomes low. However, since the inclined surface 13 has a large inclination,
The frequency change becomes large, and the desired frequency can be adjusted quickly.

FIG. 3 is a frequency characteristic diagram showing changes in the amount of insertion of the frequency adjusting screw and the oscillation frequency according to the present invention.
For example, in FIG. 2, the insertion amount of the frequency adjusting screw 6 is corrected by changing the inclination angle of the inclined surface of the flat plate 12,
The distance h between the support plate 9 and the metal plate 7 can be changed as shown by in FIG. 3, and therefore, the oscillation frequency of the microwave oscillator can be changed linearly as shown by, and the frequency can be adjusted. You can make it easier. In the embodiment shown in FIG. 2, the drive shaft 8 may be made of synthetic resin or the like, which is less likely to change in temperature, instead of using a conductor such as metal.
Further, instead of using the flat plate 12, the tip end portion of the adjusting screw 6 is thinned, and the diameter is made larger as the distance from the tip end portion is increased to provide an inclined surface on the side surface of the adjusting screw 6, and the drive shaft 8 is provided on the inclined surface. You may make it possible to adjust the distance between the metal plate 7 and the dielectric resonator 3 by pushing.

[0016]

As described above, according to the present invention,
By correcting the movement of the screw tip due to the pitch of the screw and moving the conductor for frequency adjustment provided in the dielectric resonator with the corrected amount of movement, the change characteristic of the oscillation frequency with respect to the insertion amount of the adjusting screw The frequency adjustment work can be performed faster in the low frequency range and the frequency change during the adjustment can be reduced in the high frequency range to facilitate the frequency adjustment work and the frequency deviation during the adjustment. Therefore, it is possible to provide a frequency adjusting device for a microwave oscillator capable of producing microwave oscillators having different oscillation frequencies by frequency adjustment using dielectric resonators having the same characteristics. it can.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of a frequency adjusting device for a microwave oscillator according to the present invention.

FIG. 2 is a configuration diagram showing an embodiment of a frequency adjusting device for a microwave oscillator according to the present invention.

FIG. 3 is a frequency characteristic diagram showing changes in the amount of insertion of the frequency adjusting screw and the oscillation frequency according to the present invention.

FIG. 4 is a partially cutaway perspective view of a microwave oscillator showing a conventional example.

FIG. 5 is a characteristic diagram showing the characteristics of the amount of insertion of the frequency adjusting screw and the frequency change of the microwave oscillator.

[Explanation of symbols]

 1 Shield Case 2 Dielectric Substrate 3 Dielectric Resonator 4 Conductor 5 Corrector 6 Adjusting Screw 7 Metal Plate 8 Drive Shaft 9 Support Plate 10 Spring 11 Fixing Piece 12 Flat Plate 13 Slope 14 Slope 15 Sliding 16 Groove 17 Slit 18 locking piece

Claims (4)

[Claims] 1. A microwave oscillator using a dielectric resonator, comprising: a conductor piece arranged in a magnetic field of the dielectric resonator and provided with a variable distance to the dielectric resonator; If the distance between the conductor piece and the dielectric resonator is large, the adjustment screw provided on the surface and the correction portion that engages with the adjustment screw to move the conductor piece are greatly separated. A frequency adjusting device for a microwave oscillator, characterized in that when the distance between the conductor piece and the dielectric resonator is close, the distance change is corrected so as to be small. 2. A drive shaft portion, wherein the conductor piece is supported by an upper fixing portion of the dielectric resonator via an elastic body, and a surface of the drive shaft portion facing at least the dielectric resonator. 2. The frequency adjusting device for a microwave oscillator according to claim 1, wherein the frequency adjusting device comprises a conductor plate. 3. The compensator comprises a compensator provided on a ceiling of an outer box so as to be slidable in a horizontal direction, and an engaging part is provided on a side surface of the compensator and the adjusting screw is provided on the engaging part. Of the correction tool is provided with an inclined surface, the drive shaft portion of the conductor piece is abutted against the inclined surface, and the inclination of the inclined surface causes the dielectric plate and the dielectric plate to move. The frequency adjusting device for a microwave oscillator according to claim 1 or 2, wherein a distance from the body resonator is adjusted. 4. The inclination angle of the inclined surface is changed,
4. The frequency adjusting device for a microwave oscillator according to claim 3, wherein one side is formed so as to change largely and linearly, and the other side is formed so as to change small and non-linearly.