JPH09162642A - Method for adjusting microwave oscillating frequency and microwave oscillation circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust an oscillating frequency from the microwave oscillating circuit. SOLUTION: Tip open stubs 10-12 are connected in advance to a microstrip line resonator 7. While open patterns 13-23 are formed in advance in the vicinity of the tip of the stubs 10-12, the stub 10 and the pattern 15, for example, are short-circuited by soldering. The entire area of the stub 10 connecting to a resonator 7, that is the capacitance of the stub 10 is increased, resulting that the resonance frequency is decreased. The fact as above is similarly caused to each of the other stubs 11, 12.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a microwave oscillation frequency adjusting method in a microwave oscillation circuit including a microstrip line resonator as a main constituent element, and further,
The present invention relates to a microwave oscillation circuit having a configuration in which adjustment of the microwave oscillation frequency is easy.

[0002]

2. Description of the Related Art Conventionally, as an oscillation circuit used in a microwave band, a microstrip line resonator, which is easy to be mass-produced and reduced in price, has been used exclusively as its resonator. It's a reality. By the way, in a microwave oscillating circuit including a microstrip line resonator as a main constituent element, its oscillating frequency generally varies widely due to variations in processing accuracy, component characteristics, etc. In order to bring them closer to each other, various methods have been adopted such as mounting solder on the resonator and utilizing the frequency fluctuation due to the skin effect, or trimming the resonator pattern by a laser cutter to reduce the pattern area. There is. Among these methods, for example, an oscillation frequency adjusting method using a stub is disclosed in, for example, Japanese Patent Laid-Open No. 5-335834.
Although the one described in the publication is known, FIG. 7 shows a configuration of an example of a microstrip line resonator to which such an adjusting method is applicable. As shown in the figure, the microstrip line resonator 54 is formed on a dielectric substrate, and is connected to an aspert pattern on the back surface of the substrate through a through hole 55. In the container 54, fine adjustment stubs 58 to 62 and a coarse adjustment stub 57 are formed in advance. The rough adjusting stub 57 is configured to be connected to the aspert pattern on the back surface of the substrate through the through hole 56. Now, regarding the oscillation frequency adjusting method in the microstrip line resonator 54, if any of the fine adjusting stubs 58 to 62 is selectively cut by a laser cutter or the like, the resonance frequency is lowered. Therefore, the oscillation frequency is adjusted by selectively cutting one of the fine adjustment stubs 58 to 62 sequentially until the desired frequency is reached. At this time, if the oscillation frequency is far away from the desired frequency, the coarse adjustment stub 57 is first cut, and then the fine adjustment stubs 58 to 62 are sequentially selectively cut until it falls within the desired frequency. It has been done.

[0003]

However, in the microstrip line resonator according to the prior art, the stub pattern needs to be cut in order to adjust the oscillation frequency, and special equipment such as a laser cutter is required. It has become one. Further, as the stub is sequentially cut, the selectivity Q indicating the sharpness of resonance is improved, so that C / N
Many stubs had to be cut to improve (carrier / noise).

A first object of the present invention is to provide a microwave oscillation frequency adjusting method capable of easily adjusting the oscillation frequency in the microwave oscillation circuit. A second object of the present invention is to
An object of the present invention is to provide a microwave oscillation circuit whose microwave oscillation frequency is easily adjusted.

[0005]

The first object of the present invention is basically that a microstrip line resonator is preformed with at least one open tip stub and an open pattern corresponding to the open tip stub. In this state, each time an open tip stub is selected, the open tip stub and the open pattern near the open tip stub are short-circuited with a conductor. The second object is also to pre-form the microstrip line resonator with one or more open-end stubs and an open pattern corresponding to the open-end stubs, which can be short-circuited with a conductor on the open-end stub. It is achieved by leaving.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before specifically explaining the present invention, a brief description thereof will be given. A microstrip line resonator is provided with one or more open-end stubs and corresponding open-end stubs. , When the tip open stub is selected in advance in the state where the open pattern which can be short-circuited with the conductor is formed in advance on the tip open stub, the tip open stub and the opening near the tip open stub are opened each time the tip open stub is selected. The pattern and the conductor are short-circuited. If the oscillation frequency is adjusted by short-circuiting between the open stub and the open pattern by a conductor (metal) such as soldering, the oscillation frequency can be easily adjusted without the need for special equipment such as a laser cutter. I will get it. Further, in the case of short-circuiting with a bonding wire instead of soldering, the oscillation frequency can be finely adjusted more finely by adjusting the number of the bonding wires. Furthermore, when the oscillation frequency is not adjusted, that is, in the initial state, the total area of the stubs formed in the microstrip line resonator is minimized, so that the selectivity Q as a resonator is the best and the number of adjustments It is possible to reduce the number and distribute the selectivity Q in a good direction.

The present invention will be described with reference to FIGS. 1 to 6. First, the microwave oscillating circuit according to the present invention will be described. FIG. 1 shows a configuration of an example of a microstrip line resonator as a main part thereof together with peripheral circuits. As shown in the figure, in the resonance circuit 2, the microstrip line resonator 7 according to the present invention is configured as a rectangular shape that resonates at an electrical length of a half wavelength λ / 2 of an intended oscillation frequency. However, the open tip stubs 10 to 12 are further pre-connected thereto, and the open patterns 13 to 23 are also pre-formed near the tip portions of the open tip stubs 10 to 12, respectively. . Incidentally, the negative resistance circuit 3 and the microstrip line resonator 7 are coupled via a line 8, and the end portion of the line 8 is terminated by a non-reflection terminator 9 of 50Ω. Further, in the resonance circuit 2, a variable capacitance circuit 8 whose capacitance is variable by an external control voltage 1 is connected to the microstrip line resonator 7, and the variable capacitance circuit 8 oscillates microwaves. The circuit itself is used as a voltage controlled oscillator (VCO) for PLL, and the voltage controlled oscillation output 5 is taken out from the buffer amplifier circuit 4.

The microstripline resonator 7 according to the present invention is constructed as described above. Here, assuming that the open stub 10 and the open pattern 15 are short-circuited by soldering, for example, Open-ended stub 10 connected to the microstripline resonator 7
However, this is equivalent to an increase in the capacitance connected to the microstrip line resonator 7, and the resonance frequency can be lowered by the short circuit. This situation also applies to each of the other open-end stubs 11 and 12. However, how much the resonance frequency is lowered depends on the microstrip line resonator 7 of each of the open-end stubs 10-12.
It depends on the formation position. In the formed state shown in FIG. 1, the frequency adjustment width is increased in the order of the open-end stubs 10, 11 and 12. In other words, the open tip stubs 10 and 11 function for fine frequency adjustment, and the open tip stub 12 functions for coarse frequency adjustment. By the way, the tip open stub 10-12
When each is connected to the microstrip line resonator 7, the connection portion with the microstrip line resonator 7 has a narrow pattern width and the tip portion is formed as a rectangular land having a wide pattern width. In this case, the solder is prevented from flowing into the central portion of the microstrip line resonator 7, and the increase of the oscillation frequency due to the skin effect can be prevented.

FIG. 2 also shows the configuration of another example of the microstrip line resonator according to the present invention, together with peripheral circuits. As shown in the figure, the microstrip line resonator 25 in the present example is configured to be bent in a U shape, and as a result, the size thereof is reduced mainly for a low microwave band. It has become a thing. Now, the microstrip line resonator 2
5, five tip-opening stubs 27 to 31 are connected and formed at equal intervals, and each tip-opening stub 27 to 31 is formed.
Opening patterns 32 to 36 are also formed in the vicinity of the tip portion. However, when the opening patterns 32 to 36 are formed in different sizes as shown in the drawing, The same frequency fluctuation amount can be obtained regardless of which of the open patterns 32 to 36 is short-circuited. As a result, the open pattern 32 ... Until the desired frequency is set.
It suffices that 36 be sequentially short-circuited by soldering, and the frequency can be adjusted in a simple process. Incidentally, the microstrip line resonator 25 in this example is coupled to the variable capacitance circuit 6 and directly connected to the negative resistance circuit via the connection terminal 26.

Further, FIG. 3 shows the configuration of another example of the microstrip line resonator according to the present invention together with peripheral circuits. In the microstrip line resonator 25 of this example, although the open patterns 42 to 46 have the same size, the open tip stubs 37 to 37 are formed.
Since 41 is connected and formed at unequal intervals, the frequency variation amount when the open pattern 42 is short-circuited is f1, and the open patterns 43, 44, 45, 46 are 2 × in order.
It is set so as to obtain the frequency variation amounts of f1, 4 × f1, 8 × f1, and 16 × f1. Therefore, since it is possible to adjust in 32 steps within the frequency range of 0 to 31 × f1 with the resolution of the frequency f1, it is easy to determine the open pattern position to be short-circuited from the oscillation frequency without adjustment. It is known to. By the way, when each of the open-end stubs 37 to 41 is formed in a state of being connected to the microstripline resonator 25, the pattern width of the connection portion with the microstripline resonator 25 is narrowed and the tip portion is widened. When it is formed in a trapezoidal shape, the inflow of solder to the central portion side of the microstrip line resonator 25 is blocked, and the rise of the oscillation frequency due to the skin effect can be prevented. In this example, the capacitor 24 shortens the length of the microstrip line resonator 25 to reduce the size thereof. However, as a result, the occupied area of the adjustment portion is smaller than that of the configuration shown in FIG. It has been reduced.

In any of the above examples, the open stub and the open pattern are short-circuited by soldering. However, the present invention is not limited to this. For example, a bonding wire may be used for short-circuiting. It's good.
As shown in FIG. 4, the resonance frequency is reduced by shorting the open stub 49 and the open pattern 50 with the bonding wire 52. However, the open pattern is further improved by the bonding wire 53. By short-circuiting 51, the resonance frequency is further reduced. At that time, for example, when the number of the bonding wires 52 that short-circuit the open stub 49 and the open pattern 50 is appropriately adjusted, the resonance frequency can be further finely adjusted. . In FIG. 4, reference numerals 47 and 48 respectively denote a ground pattern and a dielectric substrate.

Finally, considering the effect of the present invention, it is shown how the resonance frequency is lowered as the open patterns 32 to 36 in FIG. 2 are sequentially short-circuited by soldering. 5 shows. As shown in the figure, the resonance frequency is linearly lowered, and the frequency can be easily adjusted. Further, when unadjusted, the stub area on the microstrip line resonator is minimized and the selectivity Q is the best, so that the selectivity Q is distributed in a good direction as shown in FIG. C / N
It is possible to reduce the yield deterioration when the specification is improved.

[0013]

As described above, according to the first to fifth aspects, there is provided a microwave oscillation frequency adjusting method for easily adjusting the oscillation frequency in the microwave oscillation circuit.
According to the sixth to tenth aspects, the microwave oscillation circuits in which the microwave oscillation frequency can be easily adjusted are obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an example of a microstrip line resonator to which an oscillation frequency adjusting method using a stub according to the present invention is applicable.

FIG. 2 is a view showing a configuration of another example of the microstrip line resonator to which the oscillation frequency adjusting method by the stub according to the present invention is applicable.

FIG. 3 is a diagram showing a configuration of still another example of the microstrip line resonator to which the oscillation frequency adjusting method by the stub according to the present invention is applicable.

FIG. 4 is a diagram for explaining a frequency adjustment method in the case of short-circuiting the open stub and the open pattern with a bonding wire.

FIG. 5 is a diagram for explaining the degree of effects of the present invention.

FIG. 6 is a diagram for explaining the function and effect of the microwave oscillation circuit according to the present invention.

FIG. 7 is a diagram showing a configuration of an example of a microstripline resonator to which an oscillation frequency adjusting method using a stub according to a conventional technique is applicable.

[Explanation of symbols]

7, 25 ... Microstripline resonator, 10-1
2, 27-31, 37-41, 49 ... Tip open stub,
13-23, 32-36, 42-46, 50, 51 ... Open pattern

Claims (10)

[Claims] 1. A microwave oscillating frequency adjusting method in a microwave oscillating circuit including a microstrip line resonator as a main constituent element, wherein the microstrip line resonator is provided with at least one open tip stub and the open tip stub. The microwave oscillating frequency is configured such that the tip open stub and the open pattern near the tip open stub are short-circuited with a conductor every time the tip open stub is selected in a state where the open pattern is formed in advance. Adjustment method. 2. A microwave oscillating frequency adjusting method in a microwave oscillating circuit including a microstrip line resonator as a main constituent element, wherein the microstrip line resonator has one or more open tip stubs and the open tip stubs. The microwave oscillating frequency is such that the tip open stub and the open pattern near the tip open stub are short-circuited with solder every time the tip open stub is selected in the state where the open pattern is formed in advance. Adjustment method. 3. A microwave oscillating frequency adjusting method in a microwave oscillating circuit including a microstrip line resonator as a main component, wherein the microstrip line resonator has one or more open tip stubs and the open tip stubs. Each time the tip open stub is selected in a state in which the tip open stub is formed in advance, the tip open stub and the open pattern near the tip open stub are short-circuited with one or more bonding wires. Microwave oscillation frequency adjustment method. 4. A microwave oscillation frequency adjusting method in a microwave oscillating circuit including a microstrip line resonator as a main component, wherein the microstrip line resonator is provided near the tip open stub so as to correspond to the tip open stub. Each time the tip open stub is selected in the state where the open pattern of the size is formed and the tip open stubs are formed at equal intervals in advance, the tip open stub and the open pattern near the tip open stub are A microwave oscillation frequency adjusting method in which a conductor is short-circuited. 5. A method of adjusting a microwave oscillation frequency in a microwave oscillation circuit including a microstrip line resonator as a main constituent element, wherein the microstrip line resonator corresponds to a tip open stub and is provided in the vicinity of the tip open stub. Each time the tip opening stub is selected in the state where the opening pattern having a size is formed and the tip opening stubs are formed in advance at unequal intervals, the tip opening stub and the opening pattern near the tip opening stub are A method for adjusting the microwave oscillation frequency in which the conductor is short-circuited with a conductor. 6. A microwave oscillating circuit including a microstrip line resonator as a main component, wherein the microstrip line resonator has one or more open-end stubs and the open-end stubs corresponding to the open-end stubs. A microwave oscillation circuit having a structure in which an open pattern which can be short-circuited with a conductor is formed in advance. 7. A microwave oscillating circuit including a microstripline resonator as a main component, wherein the microstripline resonator has two or more open-end stubs at equal intervals, and the open-end stub is provided in correspondence with the open-end stub. A microwave oscillating circuit having a structure in which an open pattern of a specific size is formed in advance, which is short-circuited with a conductor on an open-end stub. 8. A microwave oscillating circuit including a microstripline resonator as a main constituent element, wherein the microstripline resonator has two or more open-end stubs at non-equidistant intervals, and the open-end stubs correspond to the open-end stub. A microwave oscillating circuit having a structure in which an open pattern of the same size, which is short-circuited by a conductor, is formed in advance on the open-end stub. 9. A microwave oscillating circuit including a microstripline resonator as a main constituent element, wherein a pattern width of a connecting portion of the microstripline resonator to the microstripline resonator is narrowed and a tip is provided. One or more open-end stubs whose portions are rectangular lands having a wide pattern width, and an open pattern corresponding to the open-end stubs and which can be short-circuited with a conductor by a conductor are formed in advance. Microwave oscillator circuit. 10. A microwave oscillating circuit including a microstripline resonator as a main constituent element, wherein a pattern width of a connecting portion of the microstripline resonator to the microstripline resonator is narrowed and a tip is provided. A microstructure having a structure in which one or more open tip stubs each having a taper shape with a wide pattern width, and an open pattern corresponding to the open tip stubs and capable of being short-circuited with a conductor by a conductor are formed in advance. Wave oscillator circuit.