JP2639238B2 - Automatic setting device for resonance frequency of resonator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for automatically setting a resonance frequency of a resonator to the set frequency based on a frequency to be set in advance (hereinafter referred to as a set frequency). The present invention relates to a device for automatically setting the resonance frequency of a resonator to be set, and a resonance frequency automatic setting type resonator.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram of a conventional example of an automatic tuning type resonator proposed in Japanese Patent Application Laid-Open No. 1-105601.

[0003] In FIG. 9, an automatic tuning type resonator according to the prior art is provided with an isolator 101 which allows an input high-frequency signal to pass in one direction and has a reflected power coupling terminal 111.
And a resonator 102 operating as a band-pass filter for band-pass filtering a high-frequency signal passed through the isolator 101
A driving mechanism 103 for changing a resonance frequency of the resonator 102 by moving a resonance frequency adjusting element (not shown) in the resonator 102;
And a control circuit 104 for detecting a high-frequency signal output from the first reflected power coupling element 111 by the diode D1 and controlling the driving mechanism 103 based on the detected signal.

In this automatic tuning type resonator, when a certain high-frequency signal is passed through the resonator, the level of the high-frequency signal of the reflected power detected by the diode D1 (hereinafter referred to as a reflected signal) is obtained. The above resonator 10
The control circuit 104 controls the driving mechanism 103 based on the reflection signal so that the level of the reflection signal is minimized, utilizing the fact that the resonance signal has the minimum at the resonance frequency of 2. As a result, the center frequency of the band-pass filter substantially equal to the resonance frequency of the resonator 102 can be tuned to the frequency of the high-frequency signal passing through the isolator 101.

[0005]

However, in the above-mentioned first conventional automatic tuning type resonator, the above-mentioned tuning operation is performed by utilizing the fact that the level of the reflected signal is minimized at the resonance frequency of the resonator 102. Therefore, for example, when the automatic tuning type resonator shown in FIG. 9 is used for the antenna sharing device and a signal wrapping around from another channel is input to the automatic tuning type resonator, the tuning operation is accurately performed. Can not be performed.

A first object of the present invention is to solve the above-mentioned problems, and to set a resonance frequency of a resonator to a desired set value automatically with a better accuracy as compared with the conventional example. It is an object of the present invention to provide a device for automatically setting the resonance frequency of a vessel.

A second object of the present invention is to provide an automatic resonance frequency setting type resonator which can automatically set a resonance frequency to a desired set value with better accuracy than the conventional example. To provide.

[0008]

According to the first aspect of the present invention, there is provided an apparatus for automatically setting a resonance frequency of a resonator, comprising an amplifying means, having a predetermined load Q, and capable of changing the resonance frequency. An oscillation loop circuit electrically connected to the resonator and having a predetermined transmission phase; frequency measurement means for measuring an oscillation frequency of an oscillation signal generated in the oscillation loop circuit; and an oscillation frequency measured by the frequency measurement means And the transmission phase of the oscillation loop circuit and the load Q of the resonator
Calculating means for calculating the resonance frequency of the resonator based on the above, so that the resonance frequency of the resonator becomes a preset frequency set in advance based on the resonance frequency of the resonator calculated by the calculation means. Control means for controlling the resonance frequency of the resonator.

According to a second aspect of the present invention, there is provided an apparatus for automatically setting a resonance frequency of a resonator, wherein the resonator has an element constant for determining its resonance frequency. A variable frequency element capable of changing the resonance frequency of the resonator, wherein the control means changes an element constant of the frequency variable element of the resonator, and a resonance of the resonator calculated by the calculation means. The frequency variable element of the resonator is controlled based on the frequency by controlling the element constant changing means so that the absolute value of the difference between the calculated resonance frequency of the resonator and the set frequency is less than a predetermined value. And a frequency control means for controlling the resonance frequency of the resonator so that the resonance frequency of the resonator becomes the set frequency. That.

[0010] Furthermore, a resonator according to a third aspect of the present invention, wherein the resonance frequency is automatically set, is a resonator having a predetermined load Q and capable of changing the resonance frequency.
The automatic setting device described above is provided.

[0011]

According to a first aspect of the present invention, there is provided an automatic setting apparatus for setting a resonance frequency of a resonator, comprising an amplifying means, electrically connected to a resonator having a predetermined load Q and capable of changing the resonance frequency. An oscillation loop circuit having a predetermined transmission phase is provided, and the frequency measurement unit measures an oscillation frequency of an oscillation signal generated in the oscillation loop circuit,
The calculation means calculates the resonance frequency of the resonator based on the oscillation frequency measured by the frequency measurement means, the transmission phase of the oscillation loop circuit, and the load Q of the resonator. Next, the control means controls the resonance frequency of the resonator based on the resonance frequency of the resonator calculated by the calculation means such that the resonance frequency of the resonator becomes a preset frequency set in advance. Thus, the resonance frequency of the resonator can be automatically set to the set frequency with a simple configuration and with better accuracy than the conventional example.

Further, in the automatic setting apparatus for the resonance frequency of the resonator according to the second aspect of the present invention, preferably, the resonance frequency of the resonator is automatically set in the automatic setting apparatus for the resonance frequency of the resonator according to the first aspect. A frequency variable element capable of changing an element constant for determining the frequency constant, wherein the control means calculates an element constant changing means for changing an element constant of the frequency variable element of the resonator, and the calculation means calculates the value. Controlling the element constant changing means based on the resonance frequency of the resonator so that the calculated absolute value of the difference between the resonance frequency of the resonator and the set frequency is less than a predetermined value; A frequency control means for changing the element constant of the frequency variable element of the resonator, thereby controlling the resonance frequency of the resonator so that the resonance frequency of the resonator becomes the set frequency. Provided with a door.

Furthermore, in the resonator according to the third aspect of the present invention, there is provided a resonator having a predetermined load Q and capable of changing the resonance frequency. Automatic setting device, which can automatically set the resonance frequency of the resonator to the set frequency with a simple configuration and with better accuracy than the conventional example. A resonator can be configured.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an automatic setting apparatus for a resonance frequency of a dielectric resonator according to an embodiment of the present invention will be described in the following order. (1) Configuration of automatic setting device of resonance frequency of dielectric resonator (2) Measurement principle of resonance frequency of dielectric resonator (3) Control flow of automatic setting process of automatic setting device (4) Modification of drive mechanism (5) Another embodiment

The automatic setting device according to the present embodiment has a known load Q
The dielectric resonator 10 having a resonance frequency to be set is electrically connected to an oscillation loop circuit including the amplifier 33, oscillated at the oscillation frequency fm, the oscillation frequency fm is measured, and the measured oscillation frequency is measured. the resonance frequency f ₀ of the dielectric resonator 10 on the basis of the set frequency f ₀₁ previously entered and fm is characterized by automatically setting the above set frequency f _01.

(1) Configuration of Automatic Setting Apparatus for Resonant Frequency of Dielectric Resonator FIG. 1 is a block diagram of an automatic setting apparatus for the resonant frequency of a dielectric resonator 10 according to an embodiment of the present invention, and FIG. Figure 1
1 is a longitudinal sectional view of a dielectric resonator 10 and a shield case 13 accommodating the same. Here, the dielectric resonator 10 has a known load Q (Q _L).

The automatic setting device has a filtering operation mode in which the dielectric resonator 10 operates as a band-pass filter;
There are two operation modes, an automatic setting mode for performing an automatic setting process for automatically setting the resonance frequency f ₀ of the dielectric resonator 10 to the set frequency f ₀₁ .

As shown in FIGS. 1 and 2, a dielectric resonator 11 of a cylindrical dielectric resonator 10 for which a resonance frequency is to be set is placed at a central portion in a cylindrical shield case 13. It is mounted on a support 14 having the same linear expansion coefficient as the resonator 11. The dielectric resonator 11 includes, for example, TiO ₂ as a main component and MgO, BaO, Z
The dielectric resonator 10 according to the present embodiment, which is a ceramic dielectric resonator mixed with an oxide such as rO ₂ , provided with the dielectric resonator 11, has a fundamental mode of _TE01δ mode of about 870 MHz to about 895 MHz. Resonance frequency f
_{Has zero} . Further, inside the cylinder of the dielectric resonator 11, a cylindrical dielectric tuning element 12 is supported by a shaft 15 so as to be movable in the axial direction of the dielectric resonator 11. A predetermined number of drive pulse signals are output from a microprocessor unit (hereinafter, referred to as MPU) 40 as a control circuit of the automatic setting device to the stepping motor 51 via the motor driving circuit 50, and the stepping motor 51 is rotated. by transmitted to the shaft 15 of the driving force through the driving mechanism 52 moves the shaft 15 in the arrow a ₁ direction. The movement of the shaft 15 causes the dielectric tuning element 12 to move the dielectric resonator 1
By moving the dielectric resonator 10 in the gradient of one electric field, the resonance frequency f ₀ of the dielectric resonator 10 can be finely adjusted.

FIG. 4 is a graph showing the relationship between the position of the dielectric tuning element 12 of the dielectric resonator 10 of FIG. 2 and the resonance frequency f ₀ of the dielectric resonator 10. Here, g is the distance from the upper surface of the dielectric tuning element 12 to the inside of the upper surface of the shield case 13. As is clear from FIG. 4, by moving the dielectric tuning element 12 away from the upper surface of the shield case 13, that is, by increasing the distance g, the resonance frequency f ₀ of the dielectric resonator 11 is reduced to the distance g. It generally changes in inverse proportion. Therefore, assuming that the resonance frequency when the dielectric resonator 11 is at a certain position is f ₀ and the set frequency to be set in the dielectric resonator 10 is f ₀₁ , the resonance frequency f ₀ of the dielectric resonator 10 is In order to set the set frequency f ₀₁ , the distance lm over which the dielectric tuning element 12 must be moved is represented by the following “Equation 1”.

[0020]

Lm = k (f ₀ −f ₀₁ )

Here, k is a constant determined from the graph of FIG. In the present embodiment, as will be described later in detail, a pulse drive signal of a pulse number corresponding to the moving distance lm calculated using “Equation 1” is transmitted from the MPU 40 to the motor drive circuit 5.
0 to the stepping motor 51 to move the dielectric tuning element 12 in the dielectric resonator 10, whereby the resonance frequency f ₀ of the dielectric resonator 10 substantially matches the set frequency f _01. So that the dielectric resonator 10
Can be set automatically. When the moving distance lm calculated by the above “Formula 1” is a positive number, a pulse drive signal having a positive polarity corresponding to the moving distance lm is input to the stepping motor 51, and at this time, the dielectric tuning is performed. The element 12 is moved in the direction of insertion into the dielectric resonator 11, thereby increasing the capacitance component of the dielectric resonator 10 and lowering its resonance frequency. On the other hand, the moving distance lm calculated by the above “Equation 1”
Is a negative number, a pulse drive signal of a negative polarity corresponding to the moving distance lm is input to the stepping motor 51. At this time, the dielectric tuning element 12
, The capacitance component of the dielectric resonator 10 decreases, and the resonance frequency increases.

FIG. 3 is a longitudinal sectional view of a driving mechanism 52 provided between the dielectric resonator 10 and the stepping motor 51.

As shown in FIG. 3, the drive mechanism 52 includes a shaft coupling 60 and two feed screws 61, provided concentrically with the shaft 15 and the shaft 51a of the stepping motor 51 in the drive mechanism housing 52h. 63. The shaft 15 of the dielectric resonator 10 is
Is interpolated and fixed. On the other hand, the stepping motor 5
The first shaft 51a is connected to the feed screw 6 via the shaft coupling 60.
It is connected to a shaft 61a formed concentrically with the first cylindrical portion 61c and protruding from the end face of the cylindrical portion 61c. The cylindrical portion 61c of the feed screw 61 is rotatably supported concentrically with the shaft 15 by a bearing 62 in a cylindrical portion 52hi inserted and fixed in the housing 52h of the drive mechanism 52. The screw formed on the inner surface of the cylindrical portion 61c of the feed screw 61 and the screw formed on the outer peripheral surface of the feed screw 63 are screwed together. The upper surface of the driving mechanism housing 52h and the lower surface of the shield case 13 are adhered to each other and integrated. As a result, when the feed screw 61 is rotated, the feed screw 63 moves in the longitudinal direction of the shaft 15 accordingly, and at this time, the shaft 15 moves in the direction of arrow A1.

The shaft 15 of the dielectric resonator 10
Meanwhile, a pressure is applied in the direction toward the stepping motor 51 by a pressurizing spring inserted into the cylindrical portion 13a of the shield case provided on the side opposite to the drive mechanism 52, and the pressurized spring is inserted into the cylindrical portion 13a. The rotation of the shaft 15 is prevented by the rotation stopper 90 thus performed.

In the drive mechanism 52 constructed as described above, when the stepping motor 51 is driven to rotate the shaft 51a, the rotation driving force is applied to the shaft coupling 60.
Is transmitted to the shaft 15 of the dielectric resonator 10 via the feed screw 61 and the feed screw 63, and the shaft 15 moves in the direction of arrow A1.

Referring back to FIGS. 1 and 2, the shield case 13 is provided on the outer surface of a cylindrical housing made of ceramic having the same linear expansion coefficient as that of the dielectric resonator 11 so as to provide electromagnetic shielding. For this purpose, a silver electrode is baked. As shown in FIG.
3 inner surfaces of each other and 9
For example, one-turn coils 21 and 2 for signal input / output are coupled at four positions separated by an angle of 0 degree to the magnetic field H of the dielectric resonator 11 as shown in FIG.
2, 23 and 24 are provided. Here, the coils 21 and 22 used in the filtering operation mode are provided to face each other with the dielectric resonator 11 interposed therebetween, and the coils 23 and 24 used in the automatic setting mode are mounted on the dielectric resonator 1.
1 are provided so as to face each other.

In the filtering operation mode, the switch SW1 is turned on and the switch SW2 is turned off, and a signal of about 800 MHz band output from the high-frequency signal generator 1 is supplied to the coil 21 via the input terminal T1 and the switch SW1. After that, the input signal is filtered by the dielectric resonator 10. The filtered signal is output from the coil 22 to the load 2 via the output terminal T2. On the other hand, in the automatic setting mode, the switch SW1 is turned off and the switch SW2 is turned on. At this time, the coils 23 and 2
An oscillation signal is generated in an oscillation loop circuit connected between the four and configured to satisfy an oscillation condition described later in detail. When the switch SW2 is turned on, the oscillation loop circuit shown in FIG. 1 is electrically connected between the coils 23 and 24, and the oscillation signal output from the coil 24 Port 34a of the sexual coupler 34,
The signal is output to the coil 23 via the transmission line connected between the switches 34b and the switch SW2. The two switches SW1 and SW2 are connected to the MPU 4 as described in detail later.
The switching is controlled by 0.

The ports 34a, 34 of the directional coupler 34
A port 34d for detecting an oscillation signal, which is a traveling wave passing through the transmission line between the transmission lines 4b and 4b, is connected to a frequency counter 35, and a port 3d for detecting a reflected wave passing through the transmission line.
4c is terminated by a load 34e having a predetermined characteristic impedance. This frequency counter 35 is connected to the port 3
The frequency of the oscillation signal detected in 4d is measured, and the data fm of the measured frequency is output to the MPU 40. Further, a keyboard 42 for inputting the set frequency f ₀₁ is connected to the MPU 40, and when the set frequency f ₀₁ is input using the keyboard 42, the data is output from the keyboard 42 to the MPU 40.

The MPU 40 controls the automatic setting device to change the resonance frequency f ₀ of the dielectric resonator 10 to the set frequency f
Execute automatic setting processing to automatically set ₀₁
A PU (not shown), a control program for controlling the automatic setting device, and a ROM (not shown) for storing data necessary for executing the control program;
RAM used as a working memory of the CPU
(Not shown), switches SW1 and SW2, frequency counter 35, CRT display 41, and keyboard 42.
And an input / output port circuit (not shown) connected to the motor drive circuit 50 and operating as an interface circuit. The MPU 40 controls the switching of the switches SW1 and SW2, as described later in detail, and outputs the oscillation frequency data fm measured from the frequency counter 35.
, And calculates the transmission phase θ ₁ of the dielectric resonator 10 based on the received oscillation frequency data fm, and calculates the known load Q (Q _L ) of the dielectric resonator 10 and the transmission phase θ calculated above. ₁ to calculate the resonance frequency f ₀ of the dielectric resonator 10, display these data on the CRT display 41, and display the resonance frequency f ₀ of the dielectric resonator 10.
_A pulse drive signal is output to the stepping motor 51 so that ₀ becomes the set frequency f ₀₁ and the automatic setting process is performed.

(2) Principle of Measuring Resonant Frequency of Dielectric Resonator The oscillation conditions in the oscillation loop circuit shown in FIG. 1 are expressed by the following “Equation 2” and “Equation 3”.

[0031]

[Number 2] _{Re (A · β 1) =} 1

[Number 3] _{Im (A · β 1) =} 0

Here, A is the amplification degree of the amplifier 33,
beta ₁ is a feedback amount in the oscillation loop circuit.

In the above-mentioned oscillation loop circuit, when the oscillation conditions represented by the above-mentioned "Equation 2" and "Equation 3" are satisfied, an oscillation signal having a certain oscillation frequency fm is generated. This oscillation frequency fm can be measured in advance using, for example, a frequency counter. The oscillation loop circuit illustrated in FIG. 1 according to the present embodiment has a predetermined transmission phase so that the above “Equation 2” and “Equation 3” are satisfied.

In the above-mentioned oscillation loop circuit, the transmission phase of the device and the line other than the dielectric resonator 10 at the proximity frequency fa arbitrarily determined so as to be close to the resonance frequency f ₀ of the dielectric resonator 10 is Θ ₁ [Rad], the transmission phase θ ₁ of the dielectric resonator 10 is expressed by the following “Equation 4”.

[0035]

(Equation 4)

Here, n is an integer, and when the proximity frequency fa is determined in advance, the transmission phase Θ ₁ of the device and the line other than the dielectric resonator 10 at the proximity frequency fa is determined.
[Rad] can be determined in advance as a device constant that can be measured in advance by a network analyzer or the like in the oscillation loop circuit.

[0037] Thus, if the proximity frequency fa is predetermined and the oscillation frequency fm and the transmission phase theta ₁ and is measured in advance under the conditions shown "Number 4" type of oscillation loop circuit, transmission of the dielectric resonator 10 The phase θ ₁ can be determined in advance. That is, as is apparent from the above equation 4,
By measuring the oscillation frequency fm and transmission phase theta ₁ in the oscillation loop circuit, it is possible to determine the transmission phase theta ₁ of the dielectric resonator 10 in the oscillation loop circuit.

[0038] When the resonance frequency of the resonator and f _0, in general, the relationship of "number 5" in the following is established between the transmission phase θ of the resonator and its load Q (Q _L).

[0039]

(Equation 5)

Therefore, when the above oscillation loop circuit is applied to the above “Equation 5”, the following “Equation 6” is obtained.

[0041]

(Equation 6)

From the above “Equation 6”, the resonance frequency f ₀ is expressed by the following “Equation 7”.

[0043]

(Equation 7)

Here, the dimensionless constant F ₁ is expressed by the following “Equation 8”.
It is represented by

[0045]

(Equation 8)

Therefore, after measuring the oscillation frequency fm of the oscillation signal generated in the oscillation loop circuit, the measured frequency fm is substituted into the above-mentioned “Equation 4” and the transmission phase θ ₁ of the dielectric resonator 10 is obtained. Can be calculated. Next, the calculated transmission phase θ ₁ and the known load Q (Q _L ) of the dielectric resonator 10 are substituted into the above equation (8) to calculate the value of the constant F ₁ , and then the calculated value is calculated. The resonance frequency f ₀ of the dielectric resonator 10 can be calculated and measured by substituting the value of the constant F ₁ into the above “Equation 7”.

(3) Control Flow of Automatic Setting Processing of Automatic Setting Apparatus FIG. 5 is a flowchart showing a control flow of automatic setting processing in the automatic setting mode of the automatic setting apparatus of FIG. 1, and is described with reference to FIG. The measurement flow of the automatic setting device will be described.

[0048] First, at step S1, setting the frequency f ₀₁ of the resonance frequency of the dielectric resonator 10 is a keyboard 42
And the data is input from the keyboard 42 to M
The data is input to the PU 40, and the data is stored in the RAM at this time. Next, in step S2, the switch SW
1 is turned off, the switch SW2 is turned on, the automatic setting device is set to the automatic setting mode, and the oscillation loop circuit is connected between the coils 23 and 24. Further, in step S3, the oscillation frequency fm of the oscillation signal generated in the oscillation loop circuit is measured by the frequency counter 35, and the data fm is stored in the RAM in the MPU 40 as the oscillation frequency fm.

Next, in step S4, the transmission frequency θ ₁ of the dielectric resonator 10 is calculated by substituting the measured oscillation frequency fm for the above-mentioned “Equation 4”, and the calculated result is stored in the RAM. Substituting the calculated transmission phase θ ₁ into the above “Equation 8” to calculate the value of the constant F ₁ ,
By substituting the calculated value of the constant F ₁ into the above “Equation 7”, the resonance frequency f ₀ of the dielectric resonator 10 is calculated, and the calculated result is stored in the RAM and displayed on the CRT display 41. I do.

Next, in step S5, based on the current resonance frequency f ₀ calculated in step S4 and the set frequency f ₀₁ input in step S1, the dielectric tuning element is used by using the above “Equation 1”. Then, at step S6, a pulse driving signal corresponding to the calculated moving distance lm is output to the stepping motor 51 via the motor driving circuit 50. As a result, the dielectric tuning element 12 is moved by the calculated moving distance lm. Further, in step S7, the oscillation frequency fm of the oscillation signal generated in the oscillation loop circuit is measured by the frequency counter 35, and the data fm is stored in the RAM in the MPU 40 in the oscillation frequency fm.
Then, in step S8, as in step S4, the resonance frequency f ₀ of the dielectric resonator 10 is calculated based on the oscillation frequency fm measured in step S7, and the calculated result is calculated. Is stored in the RAM and displayed on the CRT display 41.

[0051] Further, in step S9, calculates the absolute value of the difference between the set frequency f ₀₁ entered in the current resonance frequency f ₀ and the step S1 calculated at step S8, the value is determined in advance Is compared with the predetermined setting error Δf. Here, when the absolute value of the calculated difference is smaller than the set error Δf (YES in step 9), it is assumed that the resonance frequency f ₀ of the dielectric resonator 10 substantially matches the set frequency f _01. In step S10, the switch SW2 is turned off and the switch SW1 is turned on to end the automatic setting process, and the operation mode is set from the automatic setting mode to the filtering operation mode. On the other hand, when the calculated absolute value of the difference is equal to or larger than the set error Δf (NO in step 9), the process returns to step S5, and the processes in steps S5 to S8 are repeated.
These processes are executed until the absolute value of the difference calculated in step S9 becomes smaller than the set error Δf.

As described above, the dielectric resonator 10 to be measured having the known load Q is electrically connected to the oscillation loop circuit including the amplifier 33, and oscillates at the oscillation frequency fm. The resonance frequency f of the dielectric resonator 10 is measured based on the measured oscillation frequency fm.
Since ₀ the calculated measuring the resonance frequency f ₀ of the dielectric resonator 10, at higher compared with the conventional example precision, exactly the resonance frequency f ₀ of the dielectric resonator 10 having a known load Q Can be measured. Further, based on the accurately measured resonance frequency f ₀ and the preset frequency f ₀₁ , the distance lm to be moved by the dielectric tuning element 12 is calculated using the above “Equation 1”, and the calculated movement is calculated. The stepping motor 51 is driven based on the distance lm to drive the dielectric tuning element 1.
2 is moved, and the above-described processing is repeated until the absolute value of the difference between the resonance frequency f ₀ measured by the above calculation and the previously input set frequency f ₀₁ reaches a predetermined set error Δf. The setting process of the resonance frequency f ₀ of the dielectric resonator 10 can be executed with improved accuracy of a relatively small error of not more than the error Δf.

(4) Modification of Drive Mechanism FIG. 6 shows a drive mechanism 52 of the stepping motor 51 of FIG.
FIGS. 7A and 7B are a vertical sectional view and a side view showing a first modified example 52a of FIG.
h, its cylindrical portion 52hi, and details inside the dielectric resonator 10 are omitted because they are the same as in FIG.

As shown in FIG. 6, the driving mechanism 52a of the first modified example includes feed screws 63 and 64 and bevel gears 67 and 6.
8 is provided. The shaft 15 of the dielectric resonator 10 is inserted and fixed in the feed screw 63, while the shaft 51 a of the stepping motor 51 is inserted and fixed in the bevel gear 68. The feed screw 64 has its outer peripheral surface rotatably supported by a bearing 65 in the cylindrical portion 52hi of the drive mechanism housing 52h. The bevel gear 67 has its outer peripheral surface rotatably supported in the drive mechanism housing 52h.
7 and the outer peripheral surface of the feed screw 65 are adhered and integrated. The screw formed on the inner peripheral surface of the feed screw 64 is screwed with the screw formed on the outer peripheral surface of the feed screw 63, and formed on the outer peripheral side of the bevel gear 67 and the outer peripheral side of the bevel gear 68. Screw is screwed. In the drive mechanism 52a configured as described above, when the stepping motor 51 is rotated, the bevel gear 68 connected to the shaft 51a is rotated, and accordingly, the bevel gear 67 and the feed screw 64 are rotated. As a result, the feed screw 63 rotates, and the shaft 15 moves in the longitudinal direction.

FIG. 7 is a side view showing a second modification 52b of the drive mechanism 52 of the stepping motor 51 of FIG.
7 is a longitudinal sectional view, and in FIG. 7, the details of the drive mechanism housing 52h, its cylindrical portion 52hi, and the inside of the dielectric resonator 10 are omitted because they are the same as those in FIG.

As shown in FIG. 7, the driving mechanism 52b of the second modification includes feed screws 63 and 70 and spur gears 72 and 73.
Is provided. The shaft 15 of the dielectric resonator 10 is inserted and fixed in the feed screw 63, while the shaft 51 a of the stepping motor 51 is inserted and fixed in the spur gear 73. The outer peripheral surface of the feed screw 70 is rotatably supported by the bearing 71 in the drive mechanism housing 52h, and the inner peripheral surface of the spur gear 72 and the outer peripheral surface of the feed screw 70 are bonded and integrated. The screw formed on the inner peripheral surface of the feed screw 70 is screwed with the screw formed on the outer peripheral surface of the feed screw 63,
A screw formed on the outer peripheral surface of the spur gear 72 and a screw formed on the outer peripheral surface of the spur gear 73 are screwed together. In the drive mechanism 52b configured as described above, when the stepping motor 51 is rotated, the spur gear 73 connected to the shaft 51a is rotated, and the spur gear 72 and the feed screw 70 are rotated accordingly. As a result, the feed screw 63 rotates, and the shaft 15 moves in the longitudinal direction.

FIG. 8 is a side view showing a third modification 52c of the drive mechanism 52 of the stepping motor 51 of FIG.
FIG. 8 is a vertical cross-sectional view, and in FIG. 8, the details of the drive mechanism housing 52h, its cylindrical portion 52hi, and the inside of the dielectric resonator 10 are omitted because they are the same as those in FIG.

As shown in FIG. 8, the drive mechanism 52c of the third modification includes feed screws 63 and 70 and a timing gear 8
0, 81 and a timing belt 82. The shaft 15 of the dielectric resonator 10 is inserted and fixed in the feed screw 63, while the shaft 5 of the stepping motor 51 is fixed.
1 a is inserted and fixed in the timing gear 81. The outer peripheral surface of the feed screw 70 is rotatably supported by the bearing 71 in the drive mechanism housing 52h, and the inner peripheral surface of the timing gear 80 and the outer peripheral surface of the feed screw 70 are bonded and integrated. The screw formed on the inner peripheral surface of the feed screw 70 is screwed with the screw formed on the outer peripheral surface of the feed screw 63,
A timing belt 82 is stretched between the timing gear 80 and the timing gear 81. In the drive mechanism 52c configured as described above, when the stepping motor 51 is rotated, the timing gear 81 connected to the shaft 51a rotates, and accordingly, the timing gear 80 and the feed screw are connected via the timing belt 82. 70
Rotates, and the feed screw 63 rotates accordingly, so that the shaft 15 moves in the longitudinal direction.

(5) Other Embodiments In the above embodiments, automatic setting of the resonance frequency of the resonator for automatically setting the resonance frequency of the dielectric resonator 10 having a known load Q to a predetermined set frequency is performed. Although the setting device has been described, the present invention is not limited to this, and can be applied to other types of resonators having a known load Q such as a cavity resonator and a semi-coaxial resonator.

[0060]

As described in detail above, according to the apparatus for automatically setting the resonance frequency of the resonator according to the first aspect of the present invention,
An oscillation loop circuit having amplification means, electrically connected to a resonator having a predetermined load Q and capable of changing a resonance frequency and having a predetermined transmission phase; and an oscillation signal generated in the oscillation loop circuit. Frequency measurement means for measuring the oscillation frequency of the resonator, and calculation for calculating the resonance frequency of the resonator based on the oscillation frequency measured by the frequency measurement means, the transmission phase of the oscillation loop circuit, and the load Q of the resonator. Means, and control means for controlling the resonance frequency of the resonator based on the resonance frequency of the resonator calculated by the calculation means such that the resonance frequency of the resonator becomes a preset frequency set in advance. Therefore, the resonance frequency of the resonator can be automatically set to the set frequency with a simple configuration and with better accuracy than the conventional example. There is a point.

According to a third aspect of the present invention, there is provided an automatic resonance frequency setting type resonator which can change a resonance frequency having a predetermined load Q. An automatic setting device which has an automatic setting device and which can automatically set the resonance frequency of the resonator to the set frequency with a simple configuration and with better accuracy than the conventional example. Vessels can be configured.

[Brief description of the drawings]

FIG. 1 is a block diagram of an apparatus for automatically setting a resonance frequency of a dielectric resonator according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the dielectric resonator of FIG. 1 and a shield case accommodating the same.

FIG. 3 is a longitudinal sectional view showing details of a dielectric resonator of FIG. 1, a shield case accommodating the dielectric resonator, and a driving mechanism of a stepping motor.

FIG. 4 is a graph showing a relationship between a position of a dielectric tuning element of the dielectric resonator of FIG. 1 and a resonance frequency.

FIG. 5 is a flowchart showing an automatic setting process of the automatic setting device of FIG. 1;

FIG. 6 shows a first example of a driving mechanism of the stepping motor shown in FIG.
It is the longitudinal section and side view which show the modification of.

FIG. 7 shows a second driving mechanism of the stepping motor shown in FIG.
It is the side view and longitudinal cross section which show the modification of.

FIG. 8 shows a third example of the driving mechanism of the stepping motor shown in FIG.
It is the side view and longitudinal cross section which show the modification of.

FIG. 9 is a block diagram of a conventional automatic tuning type resonator.

[Explanation of symbols]

 Reference Signs List 10: dielectric resonator, 11: dielectric resonator, 12: dielectric tuning element, 23, 24: coil, 33: amplifier, 34: directional coupler, 35: frequency counter, 40: microprocessor unit (MPU) ), 42: keyboard, 51: stepping motor, SW2: switch.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Kubo 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto, Japan Inside Murata Manufacturing Co., Ltd. (72) Inventor Taiyo Nishiyama 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto, Japan Murata Manufacturing Co., Ltd.

Claims (3)

(57) [Claims] 1. An oscillation loop circuit having amplification means, electrically connected to a resonator having a predetermined load Q and capable of changing a resonance frequency, and having a predetermined transmission phase, and the oscillation loop circuit. Frequency measuring means for measuring an oscillation frequency of an oscillation signal generated in the oscillator, and resonance of the resonator based on the oscillation frequency measured by the frequency measuring means, the transmission phase of the oscillation loop circuit, and the load Q of the resonator. Calculating means for calculating a frequency, and controlling the resonance frequency of the resonator based on the resonance frequency of the resonator calculated by the calculation means such that the resonance frequency of the resonator becomes a preset frequency set in advance. An automatic setting device for a resonance frequency of a resonator, comprising: a control unit. 2. The resonator according to claim 1, further comprising: a frequency variable element capable of changing an element constant for determining a resonance frequency of the resonator, wherein the control unit changes an element constant of the frequency variable element of the resonator. The absolute value of the difference between the calculated resonance frequency of the resonator and the set frequency becomes less than a predetermined value based on the element constant changing means and the resonance frequency of the resonator calculated by the calculation means. Controlling the element constant changing means to change the element constant of the frequency variable element of the resonator, thereby controlling the resonance frequency of the resonator so that the resonance frequency of the resonator becomes the set frequency. The automatic setting device according to claim 1, further comprising frequency control means. 3. An automatic resonance frequency setting type resonance comprising a resonator having a predetermined load Q and capable of changing the resonance frequency, and the automatic setting device according to claim 1. vessel.