JPH05226916A - 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 7 is fitted to the end face of a dielectric body 6 whose dielectric constant is lower than that of the dielectric resonator provided on the plane 1a of the dielectric resonator 1 and the passing part 8 of a laser beam A is provided on the position of a metallic case 4 opposed to an electrode 7. The electrode 7 is irradiated with a laser beam A through the passing part 8 from the external part of the metallic case 4 and by cutting off the electrode 7 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 a lower dielectric constant than the dielectric resonator on one plane portion of the dielectric resonator that resonates in the TE ₀₁ δ mode. A dielectric is attached, electrodes are attached to the end faces of the dielectric, and a laser passage portion is provided at a position facing the electrode of the metal case housing the dielectric resonator, and the dielectric resonator is resonated. A structure is adopted in which the electrode is irradiated with a laser from the outside of the metal case through the passage and the electrode is scraped off by the laser to adjust the resonance frequency of the dielectric resonator.

[0012]

Function: An electrode is attached to an end surface of a dielectric material having a dielectric constant lower than that of the dielectric resonator mounted on one flat surface of the dielectric resonator, and the dielectric resonator is housed in a metal case. It is possible to adjust the frequency while confirming the resonance frequency by irradiating the dielectric electrode with a laser beam from the outside through the passage, and scraping off the electrode with the laser beam while the dielectric resonator is operating in resonance. .

[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,
1b has a lower dielectric constant than that of the dielectric resonator 1 formed in the shape of a cylinder or a prism having a diameter smaller than that of the dielectric resonator 1 near the center of the flat surface portion 1a. The dielectric 6 is adhesively fixed, and a mesh-shaped electrode 7, for example, is attached to the upper end surface of the dielectric 6.

As shown in FIG. 1, the dielectric resonator 1 is adhesively fixed to the upper end of a support base 2 mounted on a circuit board 3 so that the electrodes 7 face 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 8 for the laser beam A is provided at an upper position facing the electrode 7 of the metal case 4, and the laser beam A is passed from the outside of the metal case 4 through the passage portion 8 to the electrode 7.
Then, the resonance frequency of the dielectric resonator 1 is adjusted by irradiating the electrode 7 and shaving off the electrode 7.

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

As shown in FIG. 2, a dielectric 6 is attached to the central portion of the upper plane portion 1a, and an electrode 7 is attached to the upper end surface of the dielectric 6 to mount the dielectric resonator 1 on a support 2 as shown in FIG. Then, the dielectric resonator 1 is resonated and housed in the metal case 4, 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.

As described above, while resonating the dielectric resonator 1 and checking the resonance frequency, the electrode 7 is irradiated with the laser beam A from the outside of the metal case 4 through the passage portion 8 to scrape off the electrode 7. Adjust the resonant frequency to the desired value.

The resonance frequency of the dielectric resonator 1 is increased by the attachment of the electrode 7 provided via the dielectric 6 having a low dielectric constant. When the electrode 7 is scraped off by the laser beam A, the resonance frequency is changed according to the scraped amount. It is sufficient to scrape off the electrode 7 while confirming the frequency so that the frequency is lowered and thus the desired resonance frequency is obtained.

In the above adjusting method, the dielectric resonator 1
The material of the electrode 7 provided on the dielectric 6 attached to the above may be any material that can be scraped off by the laser beam A. For example, an alloy mainly composed of Ag such as Ag, Ag-Pt, or Ag-Pd is used. Since such a material is preferably sublimated by irradiation with a laser beam, there is an advantage that shavings do not come out and have a bad influence on other circuits and parts as in the case of shaving a dielectric resonator.

Further, it is desirable that the dielectric 6 has a dielectric constant as low as possible. Even if the area of the electrode 7 provided on the end face of the dielectric 6 is relatively large, the electrode is directly provided on the dielectric resonator 1. Compared with the case, there is an advantage that Q is less deteriorated.

That is, when the dielectric 6 having a low dielectric constant is attached on the flat surface 1a of the dielectric resonator 1 and the electrode 7 is formed on the end face of the dielectric 6, the electrode 7 is separated from the dielectric resonator 1. Since it is arranged, Q is less likely to deteriorate.

By the way, depending on the presence or absence of the electrode 7, the resonance frequency can be changed by about 3%, for example, 300 MHz at 10 GHz.

Further, by making the hole diameter of the passage portion 8 provided in the metal case 4 to be approximately the same as the electrode 7, there is almost no change in the resonance frequency or deterioration of Q, and the influence of the hole can be ignored.

In the illustrated embodiment, the dielectric 6 is provided on the upper flat portion 1a of the dielectric resonator 1, the electrode 7 is attached to the end face thereof, and the laser beam A is passed through the passage portion 8 provided on the upper portion of the metal case 4. Although the example of scraping off the electrode 7 is shown, the dielectric 6
May be attached to the lower flat surface portion 1b of the dielectric resonator 1, an electrode may be attached to the lower end surface thereof, and the electrode may be scraped off to adjust the resonance frequency.

In this case, the support base 2 is formed into a hollow cylindrical shape which is fitted onto the dielectric 6, and the circuit board 3 and the metal case 4 are used.
A hole for passing a laser beam may be provided at the bottom of the.

Therefore, the dielectric resonator 1 has only to resonate in the TE ₀₁ δ mode and the traveling direction of the electromagnetic field indicates the passage portion 8 of the metal case 4, and its shape and arrangement can be freely selected. .

Further, the metal case 4 provided with the passage portion 8 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 8
There is only one metal case 4 having. Of course, the metal case 4 provided with the passage portion 8 may be used as it is as a product.

[0032]

As described above, according to the present invention, a dielectric material having a dielectric constant lower than that of the dielectric resonator is attached to the flat surface of the dielectric resonator to be housed in the metal case, and the electrode is attached to the end face of the dielectric material. Since it adheres, the electrode is irradiated with a laser beam from the outside of the metal case through the passing portion, and the resonance frequency of the dielectric resonator is adjusted by removing the electrode.
The resonant frequency of the dielectric resonator can be adjusted simply by irradiating the electrodes with a laser beam, which facilitates automation of the adjustment work and shortens the adjustment time.

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

Furthermore, the electrode can be provided by a dielectric material apart from the dielectric resonator, and deterioration of Q can be suppressed even if the electrode area is relatively large.

[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 Dielectric 7 Electrode 8 Passage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahito Ogi 2 26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Murata Manufacturing Co., Ltd. (72) Inventor Yukio Mori 226-10 Tenjin, Nagaokakyo, Kyoto Stock Company Murata Manufacturing

Claims (1)

[Claims] 1. A dielectric resonator having a lower dielectric constant than that of a dielectric resonator that resonates in a TE ₀₁ δ mode is attached to one flat surface of the dielectric resonator, and an electrode is attached to an end surface of the dielectric resonator, A laser passage portion is provided at a position facing the electrode of the metal case that houses the body resonator, and the laser is irradiated to the electrode through the passage portion from the outside of the metal case in a state where the dielectric resonator resonates. A method of adjusting a resonance frequency of a dielectric resonator, the method comprising adjusting the resonance frequency of a dielectric resonator by scraping off.