JPH11340737A - Dielectric oscillator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillator for oscillating with different oscillation frequencies in a wide band by providing island-shaped patterns on a micro-strip line, providing an open stab having an island-shaped pattern at a variable capacitive diode for adjusting tuning frequencies, using a common substrate, exchanging a dielectric resonator and changing the connection of the patterns on the substrate. SOLUTION: The tuning frequencies of a resonance circuit are varied by a movable short-circuit board 26 and a variable capacitive diode 14, and island- shaped patterns 8 and 9 and an island-shaped pattern 10 of a first open stab 6 are connected through a golden ribbon with the both edge sides of a second micro-strip line 5 so that the tuning frequencies can be adjusted. Moreover, a second open stab 10 is connected through a golden ribbon with an island- shaped pattern 11 so that an impedance at the output side of an FET 1 can be adjusted. Also, a first micro-strip line 3 and the second micro-strip line 5 are arranged in non-parallel so that a dielectric resonator 4 can be interposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric oscillator used for a microwave transceiver, a microwave synthesizer, and the like.

[0002]

2. Description of the Related Art FIG.
No. 5 shows a configuration of a conventional dielectric oscillator using a variable capacitance diode, wherein 1 is a field effect transistor (hereinafter referred to as FET), 4 is a dielectric resonator,
3, 55 are a first microstrip line and a second microstrip line arranged at right angles to each other, 14 is a variable capacitance diode, 2, 15 is a high impedance line,
50 is a load resistance, 16 is a control voltage input terminal, and 56 is a stub length variable open stub. 13 is a ground,
These patterns and electronic components are formed on a high-frequency board (not shown). FIG. 12 shows, for example, Avant
FIG. 4 is a cross-sectional view of a dielectric oscillator that adjusts the tuning frequency using a movable short-circuit plate shown in the supplementary material of the ek catalog.
Is a dielectric resonator, 26 is a movable short-circuit plate, 25 is a high-frequency substrate, 23 is a metal case, and 27 is a metal lid.

In such a conventional dielectric oscillator, the oscillation frequency is mainly determined by the resonance frequency determined by the dielectric constant and the external dimensions of the dielectric resonator 4, and the movable short-circuit plate 26, the dielectric resonator 4 and 12 (FIG. 12) or the capacitance braking voltage of the variable capacitance diode 14 (FIG. 1).
Fine adjustment of the oscillation frequency is performed according to 1). The output power, phase noise, frequency tuning sensitivity, etc. of the dielectric oscillator
The distance between the movable short-circuit plate 26 and the dielectric resonator 4 or the capacitance braking voltage of the variable capacitance diode 14,
The first microstrip line 56 connected to the gate terminal of the FET 1, the second microstrip line 53 connected to the variable capacitance diode 14, and the dielectric resonator 4
Is determined by the load Q value of the resonance circuit using the coupling amount determined by the position of the resonance circuit as a parameter. In order for this dielectric oscillation circuit to oscillate, as viewed from the gate terminal of the FET1,
Reflection coefficient Γa of active resonance circuit 21 and dielectric resonance circuit 2
The relationship between 0 and the reflection coefficient Γr is expressed by the following equations (1) and (2).
It is necessary to satisfy the condition that can be expressed by. | Γa | · | Γr |> 1 ‥‥ (1) ∠Γa + ∠Γr = 2nπ (n: integer) ‥‥ (2) Can be configured.

[0004]

In the conventional dielectric oscillator having the above-described structure, the oscillation circuit section is configured so that the optimum oscillation conditions are obtained only in the dielectric resonator 4 having a specific resonance frequency. The variable range of the oscillation frequency is limited to the range of adjustment of the variable capacitance diode 14 or the movable short-circuit plate 26. Further, even if only the dielectric resonator 4 is replaced to change the oscillation frequency, the desired output power, phase noise, frequency tuning sensitivity, etc. can be obtained as it is because the resonance frequency of the oscillation circuit section is different. Have difficulty. Therefore, for each dielectric resonator 4 having a desired resonance frequency, it is necessary to manufacture a high-frequency substrate constituted by the microstrip lines 53 and 55 and the stub length variable open stub 56 which are optimal for the resonance frequency. Was. For this reason, when manufacturing a small number and variety of dielectric oscillators, it is necessary to design for each resonance frequency, and there has been a problem that the cost is increased and the manufacturing period is lengthened.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems, and only uses a common substrate to change the dielectric resonator and change the connection of the pattern on the substrate. An object is to obtain a dielectric oscillator that oscillates at different oscillation frequencies.

[0006]

According to a first aspect of the present invention, there is provided a dielectric oscillator including a movable short-circuit plate and a variable capacitance diode, wherein a tuning frequency of a resonance circuit is varied, and one end of the variable capacitance diode is provided. An island-shaped pattern is provided at both ends of a microstrip line (second microstrip line) connected to the side, and an open stub having an island-shaped pattern is provided at the other end of the variable capacitance diode. The tuning frequency is adjusted.

In the dielectric oscillator according to a second aspect of the present invention, the island-shaped pattern is formed of a gold ribbon such that the line length of the first open stub becomes ４ wavelength at a desired frequency. In the second microstrip line, the line length from the coupling point of the dielectric resonator to the variable capacitance diode is 波長 wavelength, and the line length on the side opposite to the coupling point is 1/2. The island-like pattern of the second microstrip line is connected by a gold ribbon so as to have four wavelengths.

In a dielectric oscillator according to a third aspect of the present invention, the first microstrip line and the second microstrip line are sandwiched by a dielectric resonator, and
They are arranged in parallel.

According to a fourth aspect of the present invention, in the dielectric oscillator, the output matching circuit includes a third microstrip line connected to the drain side of the FET, and an island shape connected to the third microstrip line. The second having the pattern of
And the second open stub and the island-shaped pattern are connected by a gold ribbon.
The position and length of the second open stub with respect to the ET can be changed.

According to a fifth aspect of the present invention, there is provided a dielectric oscillator, comprising: a 波長 wavelength and a ４ wavelength at a desired frequency from an FET;
At a distance of an integer multiple of half wavelength
A coupling point between the dielectric resonator and the first microstrip line is provided, and a second microstrip line is formed so that a variable capacitance diode can be mounted at a position corresponding to the position of the coupling point. It was done.

A dielectric oscillator according to a sixth aspect of the present invention includes a FET and a variable capacitance diode each provided with a bias circuit composed of a high impedance line and a radial stub.

In a dielectric oscillator according to a seventh aspect of the present invention, the second microstrip line is a circle centered on a mounting position of a terminal of the variable capacitance diode opposite to the second microstrip line. They are arranged in an arc.

In the dielectric oscillator according to the present invention, an island pattern is provided between the dielectric resonator and the second microstrip line, and the second microstrip line and the island are provided. Are connected to each other with a gold ribbon so that the distance between the dielectric resonator and the second microstrip line can be changed.

According to a ninth aspect of the present invention, there is provided a dielectric oscillator in which a radio wave absorber is attached to both sides or one side of a movable short-circuit plate.

According to a tenth aspect of the present invention, in the dielectric oscillator, the movable short-circuit plate has a structure that covers at least a portion of the substrate on which the dielectric resonance circuit is mounted, and a screw is provided on the movable short-circuit plate. Thus, the movable short-circuit plate is fixed to the metal case, and the distance between the dielectric resonator and the movable short-circuit plate can be changed.

In a dielectric oscillator according to an eleventh aspect of the present invention, the movable short-circuit plate is formed in a disk shape, and a screw portion is formed on a side surface of the movable short-circuit plate and an inner side surface of the metal case. By screwing into the metal case, the movable short-circuit plate is fixed to the metal case, and the distance between the dielectric resonator and the movable short-circuit plate can be changed.

In the dielectric oscillator according to a twelfth aspect of the present invention, the metal plate to which the movable short-circuit plate is attached can be covered, and the movable short-circuit plate attached can cover the entire portion of the substrate on which the dielectric resonance circuit is mounted. It is a metal plate provided with mounting holes at a plurality of locations.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, portions common to the conventional example will be described using the same reference numerals.

Embodiment 1 FIG. 1A is a configuration diagram of a dielectric oscillator according to the first embodiment of the present invention, wherein 20 is a dielectric resonance circuit, 21 is an active resonance circuit, and 22 is an output matching circuit. The active resonance circuit 21 is composed of the FET 1 whose drain is grounded at a high frequency by applying a negative voltage to the drain terminal (D). The drain terminal (D) of FET1 has a drain bias input terminal 1
A bias voltage is supplied from 6 via a high impedance line 15, and the source terminal (S) of the FET 1 is connected to the ground 13 via the high impedance line 15. The dielectric resonance circuit 20 includes a dielectric resonator 4 having a desired resonance frequency, a linear first microstrip line 3 connected to the gate terminal (G) of the FET 1, and the first microstrip line. 2, a second microstrip line 5 having island-shaped patterns 7 and 8 at both ends, and a second terminal (anode side)
Is connected to the second microstrip line 5 and the other terminal (cathode side) is connected to the first open stub 6 having the island-shaped pattern 9.
And Reference numeral 12 denotes a terminating resistor (Z0) for grounding the first microstrip line 3 to the ground 13,
An input control voltage input terminal 16 supplies a control voltage to the variable capacitance diode 14, and a gate bias input terminal 17 supplies a bias voltage to the gate terminal (G) of the FET 1 via the high impedance line 15. The output matching circuit 22 is a third microstrip line 2 that connects the drain terminal (D) of the FET 1 and the output terminal 19.
And a second open stub 10 having an island-shaped pattern 11 connected to the third microstrip line 2.

FIG. 1B is a sectional perspective view of the dielectric oscillator according to the first embodiment of the present invention.
A high-frequency substrate made of, for example, alumina ceramics, on which patterns such as the first microstrip line 3 and the second microstrip line 5 and electronic components such as the dielectric resonator 4 are arranged as shown in FIG. Is a movable short-circuit plate, and 27 is a metal lid. Here, the movable short-circuit plate 25 is fixed to the metal lid 27 by an adjusting screw 25n so as to face the dielectric resonator 4, and the movable short-circuit plate 25 and the dielectric resonator 4 are connected to each other. The distance is adjusted by the adjusting screw 25n. Reference numeral 23 denotes a carrier that supports the high-frequency substrate 25.

In the dielectric oscillator having the above structure, the FET
The first microstrip line 3 connected to the first gate terminal (G) is disposed at a distance d1 from the dielectric resonator 4, and is electrically coupled to the dielectric resonator 4 by spatial electromagnetic coupling. This constitutes an LCR parallel resonance circuit that can be regarded as a parallel circuit of a resistor, an inductor, and a capacitor. The dielectric resonator 4 is arranged at a distance d2 from the second microstrip line 5 connected to the variable capacitance diode 14, and is spatially electromagnetically coupled to the second microstrip line 5. Therefore, the control voltage input terminal 1
6 according to the change in the capacitance Cj of the variable capacitance diode 14 controlled by the input voltage from
The load Q value of the parallel resonance circuit can be changed. Further, the load Q value of the dielectric resonator 4 can be changed by the movable short-circuit plate 26 provided above the dielectric resonator 4 and capable of changing the distance from the dielectric resonator 4. Therefore, the oscillation frequency of the dielectric oscillator according to the first embodiment is mainly determined by the dielectric constant and the external size of the dielectric resonator 4, and can be finely adjusted by changing the load Q as described above. .

In the second microstrip line 5, the line length from the coupling point of the dielectric resonator to the variable capacitance diode 14 is set to １ ／ of the wavelength of the oscillation frequency, and The second microstrip line 5 is set so that the line length on the opposite side becomes １ ／ wavelength.
Are connected by, for example, a gold ribbon, and the line length of the open-end stub 6 connected to the variable capacitance diode 14 is set to １ ／ wavelength of the wavelength of the oscillation frequency. By connecting the island-shaped pattern 9 of the open end stub 6 with, for example, a gold ribbon, deterioration of the load Q due to the resistance of the variable capacitance diode 14 due to resistance is reduced, and stable oscillation and low oscillation are achieved. Phase noise can be obtained. Since the first microstrip line 3 and the second microstrip line 5 are arranged non-parallel with the dielectric resonator 4 interposed therebetween, the first microstrip line 3 and the second microstrip line 5 can be arranged in the above manner depending on the position where the dielectric resonator 4 is placed. Distances d1 and d2 between microstrip lines 3 and 5 and dielectric resonator 4 can be varied. Moreover, the microstrip line 3,
By arranging 5 in a C-shape, it is easy to increase or decrease the distance between dielectric resonator 4 and microstrip lines 3 and 5 together.

Further, the second open stub 10 connected to the third microstrip line 2 between the FET 1 and the oscillator output terminal 19 and the island-shaped pattern 11 are connected by, for example, a gold ribbon, and the second The position and length of the open stub 10 of the
The impedance on the output side of T1 is adjusted so that oscillation power can be output efficiently. Further, by supplying the bias to the FET 1 and the variable capacitance diode 14 via the high impedance line 15, the oscillation can be stabilized.

As described above, according to the first embodiment, the tuning frequency of the resonance circuit is changed by the movable short-circuit plate 26 and the variable capacitance diode 14, and the island-like shape is provided at both ends of the second microstrip line 5. Patterns 8, 9 and 1
The tuned frequency is adjusted by connecting the island-shaped pattern 10 of the open stub 6 with a gold ribbon, and further connecting the second open stub 10 and the island-shaped pattern 11 with a gold ribbon to output the FET1. Since the impedance on the side is adjusted, low phase noise, high output power, and stable oscillation can be obtained at a desired oscillation frequency over a wide band. Further, since the first microstrip line 3 and the second microstrip line 5 are arranged non-parallel so as to sandwich the dielectric resonator 4, the microstrip lines 3, 5 and the dielectric resonator 4 The distances d1 and d2 can be changed. Therefore, by simply replacing the dielectric resonator 4 and changing the connection of the pattern, it is possible to easily configure a dielectric resonator having various oscillation frequencies using a common high-frequency substrate and electronic components.

Embodiment 2 FIG. 2 is a diagram showing the configuration of a dielectric oscillator according to a second embodiment of the present invention. The microstrip lines 3 and 5 coupled to the dielectric resonator 4 are formed by curves, so that the circuit mounting area is increased. Is reduced, whereby the size of the dielectric oscillator can be reduced.

Embodiment 3 FIG. FIG. 3 is a diagram showing a configuration of a dielectric oscillator according to a second embodiment of the present invention. A coupling point between a dielectric resonator 4 and a first microstrip line 3 is set at a desired frequency from the FET 1 at a desired frequency. / 4 wavelength and 1
The second microstrip line 5 can be oscillated at any position separated by an integral multiple of / 4 + half wavelength.
The variable capacitance diode 14 is patterned so that it can be mounted, and the same oscillation frequency can be obtained even if the position of the dielectric oscillator 4 is moved. For example,
The position of the dielectric resonator 4 for obtaining the optimum oscillation characteristics is 4a in FIG.
At the position of four wavelengths, the dielectric resonator 4 may be close to the FET 1, or the distance between the movable short-circuit plate 26 and the FET 1 may be short, so that the assembling workability may be difficult. At this time, the position of the dielectric oscillator 4 can be coupled to the first microstrip line 3 at a desired oscillation frequency at a position 4b which is separated by a half wavelength or an integer multiple of the half wavelength. Since the variable diode 14b corresponding to the position 4b of the dielectric oscillator and the microstrip line composed of the island-shaped pattern 8b and the stub composed of the island-shaped pattern 9b are formed in advance on the substrate, the dielectric oscillator 4a Is moved to the position of the dielectric oscillator 4b, optimum oscillation characteristics can be obtained.

Embodiment 4 In the first to third embodiments, the bias circuit of the FET 1 and the variable capacitance diode 14 is constituted only by the high impedance line 15, but as shown in FIG. 4, a radial stub 28 is used in combination with the bias circuit. This makes it possible to widen the bandwidth of the bias circuit according to the frequency band in which oscillation can be performed on the same substrate.

Embodiment 5 FIG. 5 is a diagram showing a configuration of the dielectric oscillator according to the second embodiment of the present invention. The microstrip line 5 on which the variable capacitance diode 14 is mounted and the island-shaped pattern 8 are replaced with the variable capacitance diode 14 of the stub 6. By arranging them on a circle centered on the point connected to the terminal, even if it is necessary to move the connection point between the microstrip line 5 and the variable capacitance diode 14 to oscillate different frequencies, the variable capacitance diode 14 can be easily implemented. Also, this structure
As in the third embodiment (FIG. 3), when there are a plurality of mounting positions of the variable capacitance diodes 14 (14a and 14b in FIG. 3), as shown in FIG. A plurality of arcs may be formed according to the mounting position of the diode 14, and the mounting position of the variable capacitance diode 14 may be selected as necessary.

Embodiment 6 FIG. FIG. 6 is a diagram showing a configuration of a dielectric oscillator according to a sixth embodiment of the present invention, in which an island-like pattern arranged planarly between a dielectric resonator 4 and a second microstrip line 5 is shown. 5k, the second microstrip line 5 and the island-shaped pattern 5k are connected by a gold ribbon so that the distance between the dielectric resonator 4 and the second microstrip line 5 can be varied. Thus, an optimal electronic tuning range can be obtained even for dielectric resonators 4 having different external shapes.

Embodiment 7 FIG. 7 is a sectional view of a dielectric oscillator according to Embodiment 7 of the present invention,
By attaching the radio wave absorber 29 to the substrate and adjusting the position and size of the radio wave absorber 29, the oscillation of the dielectric resonator can be stabilized even when the dielectric resonator 4 is replaced. .

Embodiment 8 FIG. FIG. 8 is a cross-sectional view of the dielectric oscillator according to the second embodiment of the present invention.
With a structure that covers the entire dielectric resonance circuit on the substrate,
Further, a screw 30n provided around the movable short-circuit plate 30
Are fixed to the metal case 23 by, for example, a nut (not shown), and the distance h between the dielectric resonator 4 and the movable short-circuit plate 30 is made variable. With such a movable short-circuit plate structure, in the dielectric oscillator shown in the first to fifth embodiments, in order to oscillate different oscillation frequencies, the outer size of the dielectric resonator and the mounting position on the resonance circuit board are changed. Even if it fluctuates greatly on the resonance circuit board, the physical fluctuation of the interval h related to vibration and the like is reduced,
0 allows stable oscillation.

Ninth Embodiment FIG. 9 is a sectional view of a dielectric oscillator according to a second embodiment of the present invention. The distance h between the dielectric resonator 4 and the movable short-circuiting plate 30 is made variable by a disk-like shape provided with a mountain and a screw thread provided on the inner side surface of the metal case 23, and the movable short-circuiting plate 30 is connected to the metal case. It may be fixed. In the dielectric oscillator having such a structure, since no protrusion such as a screw is formed in the height direction of the dielectric resonator 4, the size of the dielectric oscillator can be reduced.

Embodiment 10 FIG. 10 is a sectional view of a dielectric oscillator according to Embodiment 10 of the present invention, in which a plurality of screw holes 31 are provided in a metal cover 27 for fixing a movable short-circuit plate. Even when the mounting position of the dielectric resonator changes in order to oscillate a different frequency in the dielectric oscillator shown in the first to fifth embodiments, the movable short-circuit plate 26 is connected to the dielectric resonator by using any one of the screw holes. 4 can be configured.

[0034]

As described above, according to the first aspect of the present invention, the tuning frequency of the resonance circuit can be varied by the movable short-circuit plate and the variable capacitance diode, and at both ends of the second microstrip line. An island pattern is provided,
Further, since the tuning frequency is adjusted by providing an open stub having an island pattern on the other end side of the variable capacitance diode, the dielectric resonator 4 is replaced, and the connection of the pattern is simply changed. Dielectric resonators having various oscillation frequencies can be easily formed using a common high-frequency substrate and electronic components.

According to the second aspect of the present invention, the line length of the first open stub is set to １ ／ at a desired frequency.
The island-shaped pattern is connected by a gold ribbon so as to have a wavelength, and in the second microstrip line, the line length from the coupling point of the dielectric resonator to the variable capacitance diode is set to 波長 wavelength, and Since the island-like pattern of the second microstrip line is connected by a gold ribbon so that the line length on the side opposite to the coupling point becomes ４ wavelength, the tuning frequency can be easily adjusted with a simple configuration. Adjustments can be made.

According to the third aspect of the present invention, the first microstrip line and the second microstrip line are arranged in a non-parallel manner with the dielectric resonator interposed therebetween. The distance between the microstrip line and the dielectric resonator can be varied according to the position where the resonator is placed.

According to the fourth aspect of the present invention, the second open stub of the output matching circuit and the island-shaped pattern are connected by the gold ribbon, and the position and the length of the second open stub with respect to the FET are variable. Since it is made possible, the impedance on the output side of the FET is adjusted so that oscillation power can be output efficiently.

According to the fifth aspect of the present invention, the dielectric resonator and the FET are separated from each other at a desired frequency by a distance equal to １ ／ wavelength and １ ／ times an integer multiple of half wavelength. Since a coupling point with the first microstrip line is provided, and a second microstrip line is formed so that a variable capacitance diode can be mounted at a position corresponding to the position of each coupling point, the dielectric oscillator Optimum oscillation characteristics can be obtained even by moving.

According to the sixth aspect of the present invention, since the FET and the variable capacitance diode are each provided with the bias circuit composed of the high impedance line and the radial stub, the bandwidth of the bias circuit can be widened. it can.

According to the seventh aspect of the present invention, the second microstrip line is arranged in an arc shape centering on the mounting position of the terminal of the variable capacitance diode opposite to the second microstrip line. Therefore, even if it is necessary to move the connection point between the microstrip line and the variable capacitance diode to oscillate different frequencies,
A variable capacitance diode can be easily mounted.

According to the present invention, an island-like pattern is provided between the dielectric resonator and the second microstrip line, and the second microstrip line and the island-like pattern are provided. The pattern and the pattern are connected by a gold ribbon so that the distance between the dielectric resonator and the second microstrip line can be varied.
, An optimum electronic tuning range can be obtained.

According to the ninth aspect of the present invention, the radio wave absorber is stuck on both sides or one side of the movable short-circuiting plate. Even when the body resonance is replaced, the oscillation of the dielectric resonator can be stabilized.

According to the tenth aspect of the present invention, the movable short-circuit plate has a structure which covers at least the entire portion of the substrate on which the dielectric resonance circuit is mounted, and a screw is provided on the movable short-circuit plate, and the movable short-circuit is provided by the screw. The plate is fixed to the metal case and the distance between the dielectric resonator and the movable short-circuit plate can be changed.The external size of the dielectric resonator and its mounting on the resonant circuit board to oscillate different oscillation frequencies Even if the position largely fluctuates on the resonance circuit board, stable oscillation can be performed.

According to the eleventh aspect of the present invention, the movable short-circuit plate is formed in a disk shape, and a screw portion is formed on a side surface of the movable short-circuit plate and an inner side surface of the metal case. Screwing the movable short-circuit plate to the metal case and changing the distance between the dielectric resonator and the movable short-circuit plate. Since no projection is generated, the size of the dielectric oscillator can be reduced.

In the dielectric oscillator according to the twelfth aspect of the present invention, the metal plate to which the movable short-circuit plate is attached can be covered, and the attached movable short-circuit plate can entirely cover the portion of the substrate on which the dielectric resonance circuit is mounted. Since the metal plate has mounting holes at multiple locations, even if the mounting position of the dielectric resonator fluctuates to oscillate different frequencies, use one of the screw holes to move the movable short-circuit plate to the dielectric. It can be configured on a resonator.

[Brief description of the drawings]

FIG. 1 is a structural diagram and a sectional perspective view showing a configuration of a dielectric oscillator according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a dielectric oscillator according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a dielectric oscillator according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a dielectric oscillator according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of a dielectric oscillator according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a dielectric oscillator according to a sixth embodiment of the present invention.

FIG. 7 is a sectional perspective view of a dielectric oscillator according to a seventh embodiment of the present invention.

FIG. 8 is a sectional view of a dielectric oscillator according to an eighth embodiment of the present invention.

FIG. 9 is a sectional view of a dielectric oscillator according to a ninth embodiment of the present invention.

FIG. 10 is a sectional perspective view of a dielectric oscillator according to a tenth embodiment of the present invention.

FIG. 11 is a diagram showing a configuration of a conventional dielectric oscillator using a variable capacitance diode.

FIG. 12 is a sectional view of a conventional dielectric oscillator using a movable short-circuit plate.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 FET (field effect transistor), 2 3rd microstrip line, 3 1st microstrip line, 5 2nd microstrip line, 4 dielectric resonator, 6 first open stub, 10 second open stub,
7, 8, 9, 11, 5k island pattern, 12 terminator, 13 ground, 14 variable capacitance diode, 1
5 high impedance lines, 16 control voltage input terminals,
17 gate bias input terminal, 18 drain bias input terminal, 19 oscillation output terminal terminal, 20 dielectric resonance circuit, 21 active resonance circuit, 22 output matching circuit, 2
3 metal case, 24 carrier, 25 high frequency board,
26, 30 movable short-circuiting plate, 27 metal lid, 28 radial stub, 29 radio wave absorber, 31 screw holes for mounting movable short-circuiting plate

Claims (12)

[Claims] 1. An active resonance circuit comprising an FET, an output matching circuit provided between a drain side of the FET and an output terminal, a dielectric resonator having a specific resonance frequency, and a gate side of the FET. A first microstrip line that is connected to the dielectric resonator and electromagnetically couples in space with the dielectric resonator;
A dielectric resonance circuit comprising a second microstrip line connected to one end of the variable capacitance diode; and a movable resonance short circuit. The tuning frequency is varied by providing an open stub having an island-shaped pattern on the other end of the variable capacitance diode, and providing an island-shaped pattern on both ends of the second microstrip line. A dielectric oscillator characterized by adjusting the following. 2. The island-shaped pattern is connected by a gold ribbon so that the line length of the first open stub becomes １ ／ wavelength at a desired frequency. The line length from the coupling point of the body resonator to the variable capacitance diode is 波長 wavelength, and the line length on the side opposite to the coupling point is ４ wavelength.
2. The dielectric oscillator according to claim 1, wherein the island-shaped patterns of the second microstrip line are connected by a gold ribbon. 3. The device according to claim 1, wherein the first microstrip line and the second microstrip line are arranged non-parallel so as to sandwich the dielectric resonator.
3. The dielectric oscillator according to claim 1. 4. An output matching circuit comprising: a third microstrip line connected to a drain side of the FET;
A second open stub connected to the third microstrip line and having an island-shaped pattern is formed. The second open stub and the island-shaped pattern are connected by a gold ribbon. 2. The dielectric oscillator according to claim 1, wherein the position and length of the second open stub can be changed. 5. A coupling between a dielectric resonator and a first microstrip line at a position separated from an FET by a distance obtained by adding a quarter wavelength and an integral multiple of a half wavelength to a quarter at a desired frequency. 2. The dielectric according to claim 1, wherein a point is provided, and a second microstrip line is formed so that a variable capacitance diode can be mounted at a position corresponding to the position of each coupling point. Oscillator. 6. The dielectric oscillator according to claim 1, wherein a bias circuit comprising a high impedance line and a radial stub is provided for each of the FET and the variable capacitance diode. 7. The semiconductor device according to claim 1, wherein the second microstrip line is arranged in an arc shape centering on a mounting position of a terminal of the variable capacitance diode opposite to the second microstrip line. 3. The dielectric oscillator according to claim 1. 8. An island pattern is provided between the dielectric resonator and the second microstrip line, and the second microstrip line and the island pattern are connected by a gold ribbon. 2. The dielectric oscillator according to claim 1, wherein a distance between the dielectric resonator and the second microstrip line is variable. 9. The dielectric oscillator according to claim 1, wherein a radio wave absorber is attached to both sides or one side of the movable short-circuit plate. 10. A structure in which the movable short-circuit plate covers at least a portion of the substrate on which the dielectric resonance circuit is mounted, a screw is provided on the movable short-circuit plate, and the movable short-circuit plate is fixed to the metal case with the screw. 2. The dielectric oscillator according to claim 1, wherein a distance between the dielectric resonator and the movable short-circuit plate is variable. 11. The movable short-circuit plate is formed in a disk shape, and a screw portion is formed on a side surface of the movable short-circuit plate and an inner side surface of the metal case, and the movable short-circuit plate is screwed into the metal case to thereby form the movable short-circuit plate. 2. The dielectric oscillator according to claim 1, wherein the short-circuit plate is fixed to a metal case, and a distance between the dielectric resonator and the movable short-circuit plate is variable. 12. A metal plate on which a movable short-circuit plate is mounted, and a metal plate provided with mounting holes at a plurality of locations where the mounted movable short-circuit plate can cover all portions of the substrate on which the dielectric resonance circuit is mounted. 2. The method according to claim 1, wherein
3. The dielectric oscillator according to claim 1.