JPS63316902A - Method for adjusting resonance frequency of resonator - Google Patents

Abstract

PURPOSE:To reduce a cost by simplifying the adjustment of a resonance frequency, by including a process to adjust the actual electric length of a strip line by filling a part between the strip line and a grounded pattern with a conductive material. CONSTITUTION:To adjust the resonance frequency of a strip line resonator 10, firstly, a belt-shaped grounded pattern 18 is formed on the main plane on the other side of a substrate 12 in the width direction of the strip line 16, for example, keeping an interval of 0.2mm. By filling the part between the strip line 16 and the grounded pattern 18 with the conductive material 20 such as solder or conductive paste, etc., as shown in an alternate long and short dash line in figure, the length L of the strip line 16 can be adjusted to, for example, length L1. Thereby, the actual electric length of the strip line 16 can be adjusted. In such a way, it is possible to adjust the resonance frequency of the strip line resonator 10 by adjusting the actual electric length of the strip line 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for adjusting the resonant frequency of a resonator, and particularly to a method for adjusting the resonant frequency of a stripline resonator.

(Prior Art) Conventionally, for example, a coaxial dielectric resonator with a high Q has been used in an oscillator for a mobile radio device in order to suppress its phase noise. However, such an oscillator cannot be made lighter or smaller due to the structure of the coaxial dielectric resonator.

Therefore, recently, stripline resonators have been used in oscillators instead of coaxial dielectric resonators.

In an oscillator using a stripline resonator, if a substrate with a high dielectric constant is used as the substrate for the stripline resonator, the wavelength shortening rate will increase, making it suitable for weight reduction and miniaturization. The oscillation frequency fluctuates due to variations.

(Problem to be Solved by the Invention) In such an oscillator, in order to adjust the oscillation frequency, it is sufficient to adjust the resonant frequency of the stripline resonator, but in the conventional method, the resonant frequency of the stripline resonator is adjusted. Since it is difficult to adjust the resonant frequency, we connect a trimmer capacitor 2 in parallel to the stripline resonator 1 and adjust the capacitance of the trimmer capacitor 2, as shown in the circuit shown in Figure 3. The oscillation frequency was adjusted. Providing separate parts such as a trimmer capacitor in this way increases the overall cost.

Therefore, the main object of the present invention is to provide a method for adjusting the resonant frequency of a resonator, which allows the resonant frequency of the resonator to be easily adjusted.

(Means for Solving the Problems) The present invention includes a dielectric substrate, a ground electrode formed on one main surface of the dielectric substrate, and a ground electrode formed on the other main surface of the dielectric substrate, at least one end of which is a ground electrode. A method for adjusting the resonant frequency of a resonator having a strip line connected to the ground pattern, the ground pattern being spaced apart from the strip line on the other main surface of the dielectric substrate and having one end connected to a ground electrode. This is a method for adjusting the resonant frequency of a resonator, which includes the steps of: forming a conductive material; and adjusting the substantial electrical length of the stripline by filling the gap between the stripline and the ground pattern with a conductive material.

(Operation) By adjusting the substantial electrical length of the stripline, the resonant frequency of the stripline resonator is adjusted.

(Effects of the Invention) According to the present invention, the resonant frequency of the resonator can be adjusted by adjusting the substantial electrical length of the strip line, so the resonant frequency of the resonator can be easily adjusted. .

Furthermore, by applying the method of the present invention to the resonator of an oscillator, the oscillation frequency of the oscillator can be adjusted. In this case, compared to the conventional method of adjusting the oscillation frequency using a trimmer capacitor, separate parts such as a trimmer capacitor are not required, so that costs can be reduced.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Embodiment) FIG. 1 is a perspective view showing an example of a stripline resonator to which the present invention is applied. This stripline resonator IO includes a substrate 12 made of a dielectric material.

A ground electrode 14 is formed on the substrate 12 from one main surface to one end surface. Further, on the other main surface of the substrate 14, a band-shaped strip line 16 is provided on the ground electrode 1.
It is formed extending from 4.

That is, one end of the strip line 16 is grounded and the other end is open. Therefore, this stripline resonator 10 is configured as a resonator that resonates at the λ/4 wavelength determined by the length of the stripline.

In order to adjust the resonant frequency of the stripline resonator 10, first, strip-shaped ground patterns 18 are formed on the other main surface of the substrate 12 at intervals of, for example, 0.2 mm in the width direction of the stripline 16. do. This ground pattern 18 is formed extending from the ground electrode 14 .

Next, the length of the strip line 16 is increased by filling the space between the strip line 16 and the ground pattern 18 with a conductive material 20, such as solder or conductive base, as shown by the dashed line in FIG. For example, take the length and adjust it. Thereby, the substantial electrical length of the stripline 16 is adjusted. In this way, by adjusting the substantial electrical length of the stripline 16, the resonant frequency of the stripline resonator 10 can be adjusted.

Note that if the width of the ground pattern 18 is formed to be extremely narrower than the width of the strip line 16, the actual electrical length of the strip line 16 cannot be changed much. It is desirable to have a width.

FIG. 2 is an equivalent circuit diagram showing an example of an oscillator using the stripline resonator shown in FIG. 1.

In this oscillator 30, the strip line resonator 10
By adjusting the resonant frequency of the oscilloscope in the above-described manner, its oscillation frequency can be adjusted. In this case, the oscillator 30 does not require separate parts such as a trimmer capacitor, and can be manufactured at a lower cost than the conventional oscillator shown in FIG.

In addition to the stripline resonator that resonates at λ/4 wavelength, the present invention can also be applied to a stripline resonator that has a stripline whose both ends are grounded and that resonates at λ/2 wavelength.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a stripline resonator to which the present invention is applied. FIG. 2 is an equivalent circuit diagram showing an example of an oscillator using the stripline resonator shown in FIG. 1. FIG. 3 is a circuit diagram showing an example of a conventional oscillator which is the background of the present invention. In the figure, 10 is a strip line resonator, 12 is a substrate, 14 is a ground electrode, 16 is a strip line, and 18 is a strip line resonator.
indicates a grounding pattern, and 20 indicates a conductive material.

Claims (1)

[Scope of Claims] A dielectric substrate, a ground electrode formed on one main surface of the dielectric substrate, and a strip formed on the other main surface of the dielectric substrate and at least one end of which is connected to the ground electrode. A method for adjusting the resonant frequency of a resonator having a line, the method comprising forming a ground pattern on the other main surface of the dielectric substrate, the ground pattern being spaced apart from the strip line and having one end connected to the ground electrode. and filling a space between the strip line and the ground pattern with a conductive material to adjust the substantial electrical length of the strip line.