JPH05226915A - Resonance frequency adjusting method for dielectric resonator - Google Patents

Abstract

PURPOSE:To easily and efficiently adjust the resonance frequency of a dielectric resonator in high accuracy. CONSTITUTION:The dielectric resonator 1 housed in a metallic case 4 is mounted onto a printed circuit board 3 with a supporting base 2, an electrode 6 is fitted onto the plane 1a of the dielectric resonator 1 and the passing part 7 of a laser beam A is provided on the position of the metallic case 4 opposed to the electrode 6. The electrode 6 is irradiated with a laser beam A through the passing part 7 from the external part of the metallic case 4 and by cutting off the electrode 6 while the dielectric resonator 1 is resonated, the resonance frequency is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily adjusting the resonance frequency of a dielectric resonator that resonates in the TE ₀₁ δ mode.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a dielectric resonator which resonates in the TE ₀₁ δ mode of this kind is housed in a metal case to form a resonator.

In this figure, a dielectric resonator 1 is formed of a dielectric material into a columnar shape or a prismatic shape, and the axial direction passing through the flat portions 1a and 1b facing each other is the traveling direction of microwaves. There is.

The dielectric resonator 1 is mounted on a microwave circuit board 3 by using a support base 2 formed of an insulating material, and the dielectric resonator 1, the support base 2 and the circuit board 3 are mounted. Is housed in the metal case 4 to form a resonator.

Although not shown, a microstrip line is provided on the circuit board 3, and the dielectric resonator 1 is magnetically coupled by the magnetic flux forming the magnetic field interlinking with the microstrip line. A resonant circuit will be formed.

By the way, in the resonator as described above,
As a conventional adjustment method for adjusting the resonance frequency of the dielectric resonator 1, as shown in FIG. 3, a metal tuning member is provided on the upper portion of the metal case 4 so as to face the flat surface portion 1a of the dielectric resonator 1. A method of attaching a screw 5 and adjusting the screw 5 to approach or separate from the dielectric resonator 1, a method of scraping off the flat surface portion 1a of the dielectric resonator 1, or a method of attaching another dielectric material to the flat surface portion 1a. Was adopted.

[0007]

However, the former method of using the tuning screw 5 has a problem that the mechanical structure of the metal case 4 becomes complicated and the manufacturing cost becomes high.

In the latter method of scraping or attaching a dielectric, it is necessary to remove the metal case each time adjustment is made, and further, it is not possible to perform it while checking the frequency while the dielectric resonator is operating. The problem is that it takes longer time.

Further, in the adjustment by shaving, the shavings may adhere to the pattern or parts on the circuit board 3 to give a bad influence.

Therefore, according to the present invention, in order to solve the above-mentioned problems, the resonance frequency of the dielectric resonator can be efficiently adjusted in a short time, and the structure of the metal case is complicated, and the pattern and the parts are complicated. It is an object of the present invention to provide a method for adjusting the resonance frequency of a dielectric resonator that can be adjusted without adversely affecting the.

[0011]

In order to solve the above problems, the present invention has an electrode attached to one flat surface of a dielectric resonator that resonates in TE ₀₁ δ mode, A laser passage portion is provided at a position facing the plane portion provided with the electrode of the metal case to be housed, and the electrode is irradiated with a laser through the passage portion from outside the metal case in a state where the dielectric resonator is resonated. This is a structure in which the resonance frequency of the dielectric resonator is adjusted by scraping off the electrodes.

[0012]

[Function] An electrode is attached to one flat surface of the dielectric resonator,
This dielectric resonator is housed in a metal case, the laser beam is irradiated from the outside of the metal case through the passage part to the dielectric electrode, and the electrode is scraped off by the laser beam while the dielectric resonator is operating in resonance. Thus, the frequency can be adjusted while checking the resonance frequency.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

The same parts as the basic structure of the resonator shown in FIG. 3 will be described using the same reference numerals.

As shown, the dielectric resonator 1 has TE ₀₁ δ
Which resonate in a mode, and are opposed to each other,
It is formed in a columnar shape or a prismatic shape having 1b, and a mesh-shaped electrode 6 is attached near the center of the flat surface portion 1a.

As shown in FIG. 1, the dielectric resonator 1 is adhered and fixed to an upper end of a support base 2 mounted on a circuit board 3 so that an electrode 6 faces upward, and together with the circuit board 3 and the support base 2, a metal is formed. It is housed in the case 4 to form a resonator. When a ground electrode is formed on the lower surface of the circuit board 3, the ground electrode can be regarded as the bottom of the metal case 4.

A passage portion 7 for the laser beam A is provided at an upper position facing the electrode 6 of the metal case 4, and the laser beam A is passed from the outside of the metal case 4 through the passage portion 7 to the electrode 6.
Then, the resonance frequency of the dielectric resonator 1 is adjusted by irradiating the substrate with the laser beam and scraping off the electrode 6.

Next, a specific method of adjusting the resonance frequency of the dielectric resonator 1 will be described.

As shown in FIG. 2, the dielectric resonator 1 having the electrode 6 attached to the central portion of the upper plane portion 1a is mounted on the support base 2 as shown in FIG. The resonator 1 is resonated and the resonance frequency is confirmed.

The confirmation of the resonance frequency is performed by, for example, placing a probe in the metal case 4 and viewing it with a network analyzer. When the oscillation circuit is configured on the circuit board 3,
Look at the oscillation frequency on the counter.

In this way, while oscillating the dielectric resonator 1 and confirming its resonance frequency, the laser beam A is applied to the electrode 6 from the outside of the metal case 4 through the passage portion 7 to scrape off the electrode 6. Adjust the resonant frequency to the desired value.

In the dielectric resonator 1, the resonance frequency increases due to the attachment of the electrode 6, and when the electrode 6 is scraped off by the laser beam A, the resonance frequency is lowered according to the scraped amount, so that the desired resonance frequency is obtained. The electrode 6 may be scraped off while checking the frequency.

In the above adjusting method, the dielectric resonator 1
The material of the electrode 6 provided in the above may be any one that can be scraped off by the laser beam A. For example, Ag, Ag-Pt, Ag-P.
It is preferable to use an alloy mainly composed of Ag such as d. Since such a material is sublimated by the irradiation of a laser beam, shavings are generated to cut off other circuits or parts like when a dielectric resonator is cut. There is an advantage that it does not adversely affect.

Further, the coating area of the electrode 6 on the dielectric resonator 1 is limited to about a quarter of the area of the flat surface portion 1a, and is limited to the vicinity of the center of the flat surface portion 1a, whereby the Q of the resonance system is deteriorated. Can be relatively small.

Nevertheless, the resonance frequency is about 3% depending on the presence or absence of the electrode 6, for example, 300 M at 10 GHz.
Hz can be changed.

Further, by making the hole diameter of the passage portion 7 provided in the metal case 4 about the same as that of the electrode 6, there is almost no change in resonance frequency and deterioration of Q, and the influence of the hole can be ignored.

In the illustrated embodiment, the electrode 6 is attached to the upper flat surface portion 1a of the dielectric resonator 1 and the electrode 6 is scraped off by the laser beam A through the passage portion 7 provided on the upper portion of the metal case 4. Alternatively, the resonance frequency may be adjusted by attaching an electrode to the lower flat surface portion 1b of the dielectric resonator 1 and scraping off the electrode.

In this case, the support base 2 may be formed in a hollow cylindrical shape, and the circuit board 3 and the metal case 4 may be provided with holes through which the laser beam passes.

Therefore, the dielectric resonator 1 has only to resonate in the TE ₀₁ δ mode and the traveling direction of the electromagnetic field points to the passage portion 7 of the metal case 4, and its shape and arrangement can be freely selected. ..

Further, the metal case 4 provided with the passage portion 7 is used for adjusting the resonance frequency, and the adjusted dielectric resonator is housed in a metal case having no passage portion to form a product. The shape can be improved, and the passing portion 7
There is only one metal case 4 having. Of course, the metal case 4 provided with the passage portion 7 can be used as it is as a product.

[0031]

As described above, according to the present invention, the electrode is attached to the flat surface of the dielectric resonator housed in the metal case, and the laser beam is applied to the electrode from the outside of the metal case through the passing portion. Since the resonance frequency of the dielectric resonator is adjusted by removing the electrode, the resonance frequency of the dielectric resonator can be adjusted simply by irradiating the electrode with a laser beam, and the adjustment work can be automated. It is easy and the adjustment time can be shortened.

Further, the frequency can be adjusted while the dielectric resonator is being resonated, and the adjustment accuracy and work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a resonator showing an adjusting method of the present invention.

FIG. 2 is a perspective view of a dielectric resonator used in the adjusting method of the present invention.

FIG. 3 is a vertical sectional view showing a basic structure of a resonator.

[Explanation of symbols]

 1 Dielectric Resonator 2 Support 3 Circuit Board 4 Metal Case 6 Electrode 7 Passage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Mori 2 26-10 Tenjin Tenjin, Nagaokakyo City, Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (1)

[Claims] An electrode is attached to one flat surface of a dielectric resonator that resonates in the TE ₀₁ δ mode, and a laser is placed at a position facing the flat surface of the metal case that houses the dielectric resonator. A characteristic is that the resonance frequency of the dielectric resonator is adjusted by irradiating the electrode with a laser from the outside of the metal case through the passage part while the dielectric resonator is resonating and shaving the electrode with the laser. And a method for adjusting the resonance frequency of a dielectric resonator.