JPH1117417A - Dielectric resonator circuit and its frequency adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dielectric resonator circuit capable of easily adjusting a resonance frequency, being suitable for automation, improving productivity and lowering the cost. SOLUTION: A first microstrip line 2 and a second microstrip line 1 are formed on one main surface of a dielectric substrate 1, a ground electrode 3 is formed on the other main surface, a columnar dielectric resonator 4 is loaded on one main surface of the dielectric substrate 1 and a metallic cover 5 is provided so as to cover the first and second microstrip lines 2 and 11 and the dielectric resonator 4. A window 14 is opened on the cover 5 and one end of the second microstrip line 11 is shaven and shortened by a laser 15 through the window 14. Thus, the resonance frequency is adjusted in the state of continuously operating this dielectric resonator circuit without detaching the cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator circuit and a method of adjusting the frequency thereof, and more particularly to a dielectric resonator circuit used as a resonance system of a microwave oscillator and capable of adjusting the frequency, and a method of adjusting the frequency thereof. About.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing the structure of a conventional dielectric resonator circuit. In FIG. 8, the dielectric resonator circuit is:
A dielectric substrate 1, a microstrip line 2 formed on one main surface of the dielectric substrate 1, a ground electrode 3 formed on the other main surface of the dielectric substrate 1, and mounted on one main surface of the dielectric substrate 1. It comprises a cylindrical dielectric resonator 4, a microstrip line 2, and a metal cover 5 provided on the dielectric substrate 1 so as to cover the dielectric resonator 4. The microstrip line 2 is arranged close to the dielectric resonator 4,
Its end is connected to an external circuit (an active element such as an FET, not shown). The resonance system of this dielectric resonator circuit includes a dielectric resonator 4 and a ground electrode 3 of the dielectric substrate 1.
And the cavity formed by the cover 5, the resonance frequency of which is substantially determined by the shape of the dielectric resonator 4 and the shape of the cavity. In this dielectric resonator circuit, the dielectric resonator 4 is electromagnetically coupled to a high-frequency signal flowing through the microstrip line 2 and resonates in the E01δ mode.

In the dielectric resonator circuit configured as described above, when the resonance frequency is changed, the dielectric resonator 4
The upper surface is cut by a luter or the like to provide a recess 6. Since the resonance frequency of the dielectric resonator circuit is substantially inversely proportional to the volume or size of the dielectric resonator, the resonance frequency can be increased as the size of the recess 6 on the upper surface of the dielectric resonator 4 is increased. , The resonance frequency can be adjusted.

FIG. 9 is a sectional view showing another configuration of a conventional dielectric resonator circuit. In FIG. 9, the same or equivalent parts as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 9, a metal screw 7 is provided on a portion of the cover 5 corresponding to the upper part of the dielectric resonator 4.

In the dielectric resonator circuit configured as described above, the resonance frequency also depends on the shape of the space formed by the dielectric substrate 1 and the cover 5, and the upper part of the dielectric resonator 4 and the cover 5 When the distance is small, the resonance frequency is low, and when the distance is large, the resonance frequency is high. Therefore, the resonance frequency can be adjusted by adjusting the screw 7 provided on the cover 5 to adjust the distance between the upper part of the resonator 4 and the screw 7 (that is, the distance from the cover 5).

FIG. 10 shows still another configuration of a conventional dielectric resonator circuit. This is the one whose basic configuration is proposed in Japanese Patent Application Laid-Open No. 7-122915. FIG.
8 is a plan view different from FIG. 8 and FIG. 9 for convenience of description, and the same or equivalent parts as in FIG. 8 are denoted by the same reference numerals and description thereof is omitted. In FIG. 10, a plurality of land patterns 8 are provided in a row on a dielectric substrate 1 with a gap therebetween in the vicinity of a dielectric resonator 4. Is provided with a through hole 9 for connection to the ground electrode (3) formed on the back surface of the. In FIG. 10, only the cover 5 is a sectional view.

In the dielectric resonator circuit configured as described above, the land pattern 8 corresponds to the microstrip line 2.
In the same manner as described above, it is electromagnetically coupled to the dielectric resonator 4. At this time, the land pattern 8 has a shape added to a resonance system composed of the dielectric resonator 4, the dielectric substrate 1, and the cover 5, and the difference in the shape affects the resonance system, that is, the resonance frequency.

Therefore, in the dielectric resonator circuit of FIG. 10, the land pattern 8 is soldered to the metal piece 10 as a connecting means in order from the side where the through hole 9 is provided.
The length of the land pattern 8 is increased. Thereby, the resonance frequency can be changed. Actually, as the length of the land pattern 8 increases, the resonance frequency sequentially decreases.

[0009]

However, in the above-mentioned three dielectric resonator circuits, the adjustment of the resonance frequency is basically performed by hand. In particular, in the conventional examples shown in FIGS. 8 and 10, it is necessary to remove the cover from the dielectric resonator during frequency adjustment, and the operation of the dielectric resonator circuit stops in that state.
For this reason, it is not possible to adjust the resonance frequency in real time while checking the resonance frequency, and it is difficult to automate the adjustment of the resonance frequency, resulting in poor productivity and an increase in production cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is possible to easily adjust a resonance frequency, to be suitable for automation, and to realize a dielectric resonator capable of improving productivity and reducing costs. Provide circuit circuit.

[0011]

To achieve the above object, a dielectric resonator circuit according to the present invention has a first microstrip line formed on one main surface and a ground electrode formed on the other main surface. And a dielectric resonator provided on one main surface of the dielectric substrate and magnetically coupled to the first microstrip line to resonate at a predetermined frequency. In the circuit, one or more second microstrip lines are provided on one main surface of the dielectric substrate in proximity to the dielectric resonator.

Further, the dielectric resonator circuit according to the present invention is characterized in that the dielectric substrate is provided with a through hole for connecting one end of the second microstrip line and the ground electrode.

In the dielectric resonator circuit according to the present invention, the dielectric resonator and a cover for covering only one end of the second microstrip line are provided on one main surface of the dielectric substrate. It is characterized by.

Further, in the dielectric resonator circuit according to the present invention, a strip electrode is provided on the other main surface of the dielectric substrate, and a through hole connecting one end of the strip electrode and one end of the second microstrip line is provided. It is provided on the dielectric substrate.

Further, a frequency adjustment method for a dielectric resonator circuit according to the present invention is characterized in that in the above-described dielectric resonator circuit, a step of reducing the length or width of the second microstrip line is provided. .

Further, the frequency adjusting method of the dielectric resonator circuit according to the present invention comprises a step of cutting the other end of the second microstrip line which is not covered by the cover in the dielectric resonator circuit. It is characterized by the following.

Further, a frequency adjustment method for a dielectric resonator circuit according to the present invention is characterized in that in the above-described dielectric resonator circuit, a step of cutting the other end of the strip electrode is provided.

By doing so, according to the dielectric resonator circuit and the method of adjusting the frequency of the dielectric resonator circuit of the present invention, the resonance frequency can be easily adjusted, suitable for automation, productivity improvement and cost reduction. Can be realized.

[0019]

FIG. 1 is a plan view showing one embodiment of a dielectric resonator circuit according to the present invention. In addition, FIG.
FIG. 1 and 2, the same or equivalent parts as those in FIGS. 8 to 10 are denoted by the same reference numerals, and description thereof will be omitted. However, in FIGS. 1 and 2, FIG.
Or the microstrip line 2 in FIG.
Of the microstrip line 2. Further, for convenience of description, in the plan views thereafter, only the cover shows a cross-sectional state.

1 and 2, a second microstrip line 11 is provided on one main surface of a dielectric substrate 1 in close proximity to a dielectric resonator 4, and a second microstrip line 11 is provided at one end thereof.
A through hole 12 is provided for connecting the microstrip line 11 to the ground electrode 3 formed on the other main surface of the dielectric substrate 1. Also, on the cover 5,
A window 14 is provided in a part thereof.

In the dielectric resonator circuit configured as described above, the second microstrip line 11
In the same manner as the land pattern 8 in the conventional example shown in FIG. 1, the magnetic field and the dielectric resonator 4 are electromagnetically coupled and resonated, and the resonance frequency of the dielectric resonator circuit can be changed depending on the shape. Therefore, one end 13 of the second microstrip line 11 where the through hole 12 is not formed is cut off with a laser or a router through a window 14 provided in the cover 5.
The length of the second microstrip line 11 is reduced.
In FIG. 2, an arrow 15 indicates laser irradiation. Thereby, the resonance frequency of the dielectric resonator circuit can be adjusted. Actually, the resonance frequency can be increased as the second microstrip line 11 is shortened.

As described above, the dielectric resonator circuit is formed, and the length of the second microstrip line is reduced by cutting the second microstrip line with a laser or a luter so that the dielectric resonator circuit can be operated without removing the cover. Adjustment of the resonance frequency can be performed in a state in which the resonance frequency is maintained, automation of the adjustment becomes possible, and improvement in productivity and cost reduction can be realized.

In the above-described embodiment, one end of the second microstrip line 11 is cut with a laser or a luter to shorten the length. It may be a method of reducing the width by shaving. In this case, the resonance frequency increases as the width of the second microstrip line 11 decreases. In particular, it is better to cut off the side edge of the second microstrip line 11 facing the dielectric resonator 4 to increase the distance between the dielectric resonator 4 and the second microstrip line 11. The effect of weakening the electromagnetic coupling with the second microstrip line 11 overlaps with the effect of increasing the resonance frequency, and the effect of increasing the resonance frequency increases.

In the above embodiment, a through-hole is provided at one end of the second microstrip line and connected to the ground electrode, and the second microstrip line is grounded. However, it may be an open track. However, in this case, since the mode of resonance of the second microstrip line itself is different from the case where one end is grounded, the resonance frequency of the dielectric resonator circuit is also different.

In the above embodiment, one second microstrip line is used. However, a plurality of second microstrip lines may be provided as long as the Q of the dielectric resonator circuit is not deteriorated. . Further, the second microstrip line is linear, but may be curved along the dielectric resonator. Also, the window provided in the cover is not only an opening, if only laser is used,
It is also possible to adopt a structure that is sealed with a laser-permeable material such as glass. In this case, since the dielectric resonator portion can be hermetically sealed, the reliability can be improved.

FIG. 3 is a plan view of another embodiment of the dielectric resonator circuit according to the present invention. FIG. 4 is a sectional view taken along the line BB. 3 and 4, the same or equivalent parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

3 and 4, on one main surface of the dielectric substrate 1, a second microstrip line 16 is provided close to the dielectric resonator 4, and the cover 5 is
In addition to the microstrip line 2 and the dielectric resonator 4,
One end of the second microstrip line 16 is covered. Therefore, a part of the dielectric substrate 1 and the other end 17 of the second microstrip line 16 formed thereon are not covered by the cover 5. Further, the second microstrip line 16 and the cover 5 are electrically insulated.

In the thus configured dielectric resonator circuit, the second microstrip line 16 is electromagnetically coupled to the dielectric resonator 4 and resonates, and the shape of the second microstrip line 16 depends on the shape thereof. The resonance frequency changes. Therefore, one end 17 of the second microstrip line 16 that is not covered with the cover 5 is shaved with a laser or a luter to obtain a second end.
Of the microstrip line 16 is shortened. FIG.
, The arrow 18 indicates laser irradiation. Thereby, the resonance frequency of the dielectric resonator circuit can be adjusted. Actually, the second microstrip line 1
6, the resonance frequency can be increased as the length is shortened.

By forming the dielectric resonator circuit in this way and cutting the second microstrip line with a laser or a luter to shorten the length, the dielectric resonator circuit can be operated without removing the cover. In this state, the resonance frequency can be adjusted, the adjustment can be automated, and the productivity can be improved and the cost can be reduced. In addition, since the dielectric resonator can be hermetically sealed, reliability can be improved.

FIG. 5 is a plan view showing still another embodiment of the dielectric resonator circuit according to the present invention. Also, FIG.
FIG. FIG. 7 shows a bottom view thereof. FIG.
In FIG. 7 to FIG. 7, the same reference numerals are given to the same or equivalent parts as in FIG. 1 and FIG. 2, and the description thereof will be omitted.

In FIGS. 5 to 7, a second microstrip line 18 is provided on one main surface of the dielectric substrate 1 close to the dielectric resonator 4, and one end thereof is provided on the other main surface. Is provided so as to face one end of the second microstrip line 18, and one end of the second microstrip line 18 and one end of the strip electrode 19 are connected by a through hole 20. Here, the strip electrode 19 is insulated from the ground electrode 3 formed on the other main surface of the dielectric substrate 1.

In the thus configured dielectric resonator circuit, the second microstrip line 18 and the strip electrode 19 connected by the through hole 20 are electromagnetically coupled to the dielectric resonator 4 to resonate. However, the resonance frequency of the dielectric resonator circuit changes depending on the shape. Therefore, the other end 21 of the strip electrode 19 is shaved with a laser or a luter to shorten the overall length of the second microstrip line 18 and the strip electrode 19. In FIG. 6, an arrow 22 indicates laser irradiation. Thereby, the resonance frequency of the dielectric resonator circuit can be adjusted. Actually, the resonance frequency can be increased as the strip electrode 19 is shortened.

The dielectric resonator circuit is constructed as described above, and the strip electrode formed on the other main surface of the dielectric substrate is shaved with a laser or a luter to shorten the length thereof, without removing the cover. The resonance frequency can be adjusted with the dielectric resonator circuit kept operating, the adjustment can be automated, and productivity can be improved and cost can be reduced. In addition, since the dielectric resonator can be hermetically sealed, reliability can be improved.

[0034]

According to the dielectric resonator circuit and the adjusting method of the present invention, the microstrip line electromagnetically coupled to the dielectric resonator and the strip electrode electrically connected to the microstrip line are provided. By shortening or narrowing the length and width with a laser or luter, the resonance frequency can be adjusted while the dielectric resonator circuit is operating, and the adjustment can be automated, resulting in productivity. And cost reduction can be realized.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a dielectric resonator circuit according to the present invention.

FIG. 2 is a sectional view taken along line AA of the embodiment of FIG.

FIG. 3 is a plan view showing another embodiment of the dielectric resonator circuit of the present invention.

FIG. 4 is a sectional view taken along line BB of the embodiment of FIG. 3;

FIG. 5 is a plan view showing still another embodiment of the dielectric resonator circuit of the present invention.

FIG. 6 is a sectional view taken along line CC of the embodiment of FIG. 5;

FIG. 7 is a bottom view of the embodiment of FIG.

FIG. 8 is a sectional view showing a conventional dielectric resonator circuit.

FIG. 9 is a sectional view showing another example of a conventional dielectric resonator circuit.

FIG. 10 is a plan view showing still another example of the conventional dielectric resonator circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dielectric board 2 ... 1st microstrip line 3 ... Ground electrode 4 ... Dielectric resonator 5 ... Cover 11 ... 2nd microstrip line 12 ... Through-hole 13 ... Deletion part by laser or luter 14 ... Window 15 … Laser irradiation

Claims (7)

[Claims] 1. A dielectric substrate having a first microstrip line formed on one main surface and a ground electrode formed on the other main surface, and a first microstrip line formed on one main surface of the dielectric substrate. In a dielectric resonator circuit comprising a dielectric resonator provided so as to resonate at a predetermined frequency by being magnetically coupled to a strip line, the dielectric resonator circuit includes: a first main surface of the dielectric substrate; A dielectric resonator circuit provided with at least one second microstrip line. 2. The dielectric resonator circuit according to claim 1, wherein a through-hole for connecting one end of the second microstrip line and the ground electrode is provided in the dielectric substrate. . 3. The dielectric resonator and a cover that covers only one end of the second microstrip line is provided on one principal surface of the dielectric substrate. 3. The dielectric resonator circuit according to claim 1. 4. A dielectric substrate, wherein a strip electrode is provided on the other main surface, and a through hole connecting one end of the strip electrode and one end of the second microstrip line is provided in the dielectric substrate. The dielectric resonator circuit according to claim 1, wherein 5. The dielectric resonator circuit according to claim 1, further comprising a step of reducing a length or a width of said second microstrip line. Adjustment method. 6. The dielectric resonator circuit according to claim 3, further comprising a step of shaving the other end of the second microstrip line that is not covered by the cover. How to adjust the frequency of the circuit. 7. The method for adjusting the frequency of a dielectric resonator circuit according to claim 4, comprising a step of shaving the other end of said strip electrode.