JPH0334608A - Microwave band dielectric voltage control oscillator - Google Patents

Abstract

PURPOSE:To easily obtain the best coupling condition of an auxiliary resonator with a varactor diode, and a dielectric oscillator by loading a substrate on which the auxiliary resonator having a variable capacitance element for varying an oscillation frequency is formed, so as to be movable on a substrate of the dielectric oscillator, and also by adjusting and fixing it. CONSTITUTION:By operating a dielectric oscillator, a position of a dielectric 1 to a coupling pattern 13 is adjusted so that prescribed oscillating condition can be obtained. Subsequently, an auxiliary resonator is loaded on a dielectric oscillator substrate 5 of the dielectric oscillator, and by moving an auxiliary resonance substrate 9, for instance, in the direction as indicated with an arrow so that prescribed variable frequency band width and a satisfactory control voltage-to-variable frequency characteristic can be obtained, an adjustment as a dielectric voltage control oscillator is executed. Also, a fine adjustment is executed with regard to a position of the dielectric 1, and subsequently, a fine adjustment is executed with regard to a position of the auxiliary resonance substrate 9. Next, a dielectric holding body 10 and the auxiliary resonance substrate 9 are fixed to the dielectric resonance substrate 5. In such a way, the best coupling state is obtained easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a microwave band dielectric voltage controlled oscillator using a dielectric resonator.

(Prior Art) A microwave band dielectric voltage controlled oscillator that controls the oscillation frequency of a dielectric oscillator using a dielectric by changing the voltage applied to a variable capacitance element, such as a varactor diode, to change its capacitance. is widely used.

FIG. 4 is a schematic configuration diagram showing an example of such a conventional microwave band dielectric voltage controlled oscillator, in which (A) is a plan view and (B) is a left side view. As shown in FIG. 4, the microwave band dielectric voltage controlled oscillator described above has a dielectric oscillator pattern 11, a coupling pattern 12, a back pattern 13, etc. formed on the surface of a dielectric oscillator substrate 5, and a predetermined pattern. A dielectric oscillator is constructed by attaching an oscillation transistor 4, an output coupling capacitor 6, a bias resistor 7, a dielectric holder 10 to which the dielectric 1 is fixed, etc., and also prevents static electricity of the varactor diode 3 due to voltage changes. In order to efficiently convert capacitance changes into changes in oscillation frequency, an auxiliary resonator 2 to which the varactor diode 3 is attached is formed at an appropriate position near the dielectric 1 on the dielectric oscillator substrate 5 to generate an auxiliary resonance. The device 2 and the dielectric 1 are appropriately combined.

(Problem to be Solved by the Invention) However, in the microwave band dielectric voltage controlled oscillator having the above configuration, since the auxiliary resonator is formed as a microstrip pattern on the dielectric oscillator substrate, the auxiliary resonator and Since the positional relationship of the dielectric oscillators is fixed, there have been cases where the best coupling conditions for the oscillator cannot be obtained due to variations in the characteristics of the elements and variations caused during manufacturing. For this reason, ■ the necessary variable frequency bandwidth cannot be obtained, ■ good control voltage vs. variable frequency characteristics cannot be obtained, ■ it is difficult to adjust the output level, ■ the above position provides the best coupling conditions. In order to determine the relationship, it was necessary to conduct repeated experiments to confirm the results, which led to problems such as inefficiency.

The present invention solves the above problems, and aims to provide a microwave band dielectric voltage controlled oscillator that can easily obtain the best coupling conditions between an auxiliary resonator with a varactor diode and a dielectric oscillator. This is the purpose.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a structure in which a substrate forming an auxiliary resonator having a variable capacitance element that changes the oscillation frequency is movably mounted on the substrate of a dielectric oscillator. It is fixed after adjustment.

(Function) After adjusting the position of the dielectric of the dielectric oscillator to satisfy the oscillation conditions, the auxiliary resonator board is mounted on the dielectric oscillator board, and the above-mentioned steps are performed to obtain the best condition as a dielectric voltage controlled oscillator. Move the auxiliary resonator board. Since the auxiliary resonator substrate can be freely moved on the dielectric oscillator substrate, the best condition can be easily obtained.

(Example) FIG. 1 is a schematic configuration diagram showing an example of the present invention.
A) is a plan view, (B) is a left side view, FIG. 2 is a schematic diagram of the dielectric oscillator, and FIG. 3 is a schematic diagram of the auxiliary resonator.

The configuration of this embodiment will be explained below based on FIGS. 1 to 3. The microwave band dielectric voltage controlled oscillator according to this embodiment is composed of a dielectric oscillator and an auxiliary resonator. The dielectric oscillator has a dielectric oscillator pattern 11, a coupling pattern 12, a back pattern 13, etc. formed on the surface of a dielectric oscillator substrate 5, as shown in FIG. A coupling capacitor 6, a bias resistor 7, a dielectric holder 10 to which a dielectric 1 is fixed, etc. are attached, and oscillation output is output from an oscillation output terminal 8.

The above configuration is almost the same as the conventional example shown in FIG. 4, but is different in that an auxiliary resonator with a varactor diode is not formed on the dielectric oscillator substrate 5. On the other hand, the auxiliary resonator has an auxiliary resonator pattern 2 formed on the surface of an auxiliary resonator substrate 9 and a varactor diode 3 attached at a predetermined position, as shown in FIG. Note that in FIGS. 1 to 3, circuits for supplying DC voltage to the oscillation transistor 4 and the varactor diode 3 are omitted for simplicity of the drawings.

Next, the adjustment in this embodiment will be explained. First, the dielectric oscillator shown in FIG. 2 is operated, and the position of the dielectric 1 with respect to the coupling pattern 13 is adjusted so that predetermined oscillation conditions are obtained. Next, the auxiliary resonator shown in FIG. 3 is mounted on the dielectric oscillator substrate 5 of the dielectric oscillator as shown in FIG. 1, and a predetermined variable frequency bandwidth and good control voltage vs. variable frequency characteristics are obtained. Adjustment as a dielectric voltage controlled oscillator is performed by moving the auxiliary resonator substrate 9, for example, in the direction of the arrow shown in FIG. Furthermore, when the auxiliary resonator board 9 is mounted on the dielectric oscillator board 5, the oscillation conditions change slightly due to the influence of the auxiliary resonator, so the position of the dielectric 1 is finely adjusted, and then the dielectric voltage The position of the auxiliary resonator substrate 9 with respect to the dielectric 1 is finely adjusted so as to obtain the best condition as a controlled oscillator. By repeating such adjustments, it is possible to simultaneously satisfy both the oscillation conditions and the characteristics required as a dielectric voltage controlled oscillator. Next, the dielectric holder 10 and the auxiliary resonator substrate 9 are fixed to the dielectric resonator substrate 5, and the adjustment is completed.

(Effects of the Invention) As described above in detail, according to the present invention, an auxiliary resonator with a variable capacitance element that changes the oscillation frequency is formed on the auxiliary resonator substrate, and this is attached to the dielectric oscillator substrate 1-. Since it is mounted, the auxiliary resonator substrate can be moved freely during adjustment.

Therefore, the necessary variable frequency bandwidth and good control voltage vs. variable frequency characteristics can be easily obtained, and the output level can also be easily adjusted.

Furthermore, since the position of the auxiliary resonator on the dielectric oscillator substrate does not need to be strictly determined in advance,
Experiments for the determination become unnecessary and become efficient.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, in which (A) is a plan view, (B) is a left side view, FIG. 2 is a schematic configuration diagram of a dielectric oscillator, and FIG. 3 is an auxiliary resonator. FIG. 4 is a schematic diagram of a conventional microwave band dielectric voltage controlled oscillator, in which (A) is a plan view and (B) is a left side view. 1... Dielectric material, 2... Auxiliary resonator pattern, 3...
・Varactor diode, 4... oscillation transistor,
5... Dielectric oscillator board, 6... Output coupling content, 7... Bias resistor, 8... Oscillation output end, 9
... Auxiliary resonator board, ] O... Dielectric holder, dielectric oscillator button, 2... Coupling button, ]2 3... Back pattern.

Claims (1)

[Claims] A microwave band dielectric voltage characterized in that a substrate forming an auxiliary resonator having a variable capacitance element that changes the oscillation frequency is movably mounted on the substrate of a dielectric oscillator and fixed after adjustment. Controlled oscillator.