JPH0352241B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a dielectric resonator device that utilizes the H ₀₁ δ mode or the H ₁₁ δ mode, and particularly relates to a dielectric resonator device that utilizes the H 01 δ mode or the H 11 δ mode. The present invention relates to a dielectric resonator device in which the resonant frequency can be adjusted to a target value by cutting off the resonant frequency.

[Conventional technology]

When configuring an oscillator or filter using a dielectric resonator, the resonant frequency of the dielectric resonator may deviate from the design value due to the influence of other nearby components, mainly the housing case. A tuning mechanism that adjusts the resonant frequency of the dielectric resonator from outside the housing case is essential.

FIG. 1 shows an example of a conventional oscillator. In the figure, 1 is a cylindrical or prismatic dielectric resonator made of titanium oxide ceramic dielectric, 2 is a stripline substrate made of alumina, 3 is the center conductor of the stripline, 4 is a ground conductor, and 5 is a ground conductor. Main case, 6 is cover case, 7 is tuning screw,
8 is a lock screw, 9 and 10 are lead leads, and an oscillator is constructed by combining with other parts not shown.

In the conventional oscillator described above, the resonant frequency of the dielectric resonator 1 can be adjusted to a target value by moving the tuning screw 7 forward and backward.

[Problem that the invention seeks to solve]

However, in the tuning mechanism of the conventional oscillator described above, since the tuning screw 7 passes through the cover case 6, there is a problem that the airtightness of the penetrating part is inevitably impaired, and it is necessary to ensure the airtightness of the part. It is very difficult.

SUMMARY OF THE INVENTION In view of the above conventional problems, an object of the present invention is to provide a dielectric resonator device that can accurately adjust the resonant frequency of a dielectric resonator to a target value and easily ensure airtightness.

[Means for solving problems]

The present invention provides a dielectric resonator device in which a dielectric resonator and a coupling means are housed in a housing case, and the housing case is configured in a sealed manner by a substrate and an exterior case fitted to the substrate. , the dielectric resonator and the coupling means are housed in the housing case, and a metal plate cover having a blocking function to block the influence of the exterior case on the resonant frequency is attached to the housing case. The metal plate cover is located between the dielectric resonator and covers the dielectric resonator, and the metal plate cover is arranged to cover the dielectric resonator by adjusting the distance between the metal plate cover and the dielectric resonator. It is characterized by having a tuning function that adjusts the resonance frequency to a target value.

Here, the tuning function in the present invention can be realized, for example, by forming a tongue-like piece on the metal cover.

[Effect]

In assembling the dielectric resonator device according to the present invention, first, the dielectric resonator is placed on the substrate, and a metal plate cover is placed to cover this. Since the cover is brought closer, the resonant frequency of the dielectric resonator changes. Therefore, by using the tuning function of the cover, for example, by moving the tongue-shaped piece formed on the cover closer to or away from the dielectric resonator, the above change can be absorbed and the resonant frequency can be easily and reliably adjusted to the target value.

Thereafter, an exterior case is fitted onto the substrate to hermetically house the dielectric resonator. In this case, in the conventional device without the metal plate cover,
Since the exterior case is directly opposed to and close to the dielectric resonator, the resonant frequency changes. However, in the present invention, since the dielectric resonator is covered with the metal plate cover, the exterior The influence of the case is blocked, and the resonant frequency does not change due to the attachment of the outer case.

In this way, in the present invention, the metal plate cover disposed inside the housing case has both the tuning function of adjusting the resonant frequency to the target value during assembly and the function of blocking the influence of the outer case on the resonant frequency. Therefore, the resonant frequency of the dielectric resonator can be easily and reliably adjusted to the target value (design value).

In addition, the tuning mechanism of the present invention is composed of a metal plate cover housed in the housing case, and there is no part that penetrates the housing case like in the conventional example described above, so its airtightness can be easily ensured. can.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

2 to 5 are diagrams for explaining one embodiment of the present invention, and this embodiment is an example of an oscillator.

In the figure, 11 is a hermetic base as a board, 12 is a cap as an exterior case fitted and attached to the base 11, and the cap 1
2 and the hermetic base 11 constitute a sealed storage case.

Reference numeral 13 denotes a metal plate cover, which consists of a band-shaped metal plate with a pair of legs 13a and both legs 1.
3a and a blocking portion 13b located between the blocking portions 13a and 13b. This blocking section 13
As will be described later, b has a blocking function of blocking the influence on the resonant frequency due to the exterior case 12 being located above the dielectric resonator 1.

Further, the blocking portion 13b of the metal plate cover 13
As shown in FIGS. 4 and 5, a tongue-like piece 14 is integrally formed by cutting and raising a part of the tongue. This tongue-shaped piece 14 has a tuning function of adjusting the resonant frequency of the dielectric resonator 1 by changing its cutting and raising angle to change the distance from the dielectric resonator 1 .

Note that the tuning function described above can also be achieved by not providing the tongue-like piece 14 as shown in FIG. 3, but by preparing legs 13a of various heights and selecting an appropriate one. realizable.

When assembling the oscillator of this example,
A stripline board 2 on which a dielectric resonator 1 and the like are mounted in the same manner as before is mounted on a hermetic base 11, a metal plate cover 13 is placed on the base 11, and the stripline board 2 is mounted on the hermetic base 11. Fix it so that it is covered.

At this time, the cover 13 is positioned within the resonant magnetic field of the dielectric resonator 1. Therefore, since this cover 13 is located opposite to the dielectric resonator 1, the resonant frequency of the resonator 1 changes. Therefore, by moving the tongue-shaped piece 14 of the cover 13 closer to or away from the dielectric resonator 1, tuning is performed so that the resonance frequency becomes the target value.

After the tuning during assembly is completed, the cap 12 is fitted onto the hermetic base 11. In this case, in a conventional structure without a blocking member such as the cover 13 of this embodiment, the resonant frequency of the resonator changes because the cap 12 faces and approaches the dielectric resonator. Tuning screws (see Figure 1) were required.
In contrast, in this embodiment, the cover 13 blocks the adverse effects of the cap 12 on the resonant frequency, and as a result, the resonant frequency is maintained at the target value tuned during the assembly.

As described above, in this embodiment, the dielectric resonator 1 is covered with the metal plate cover 13 having both the tuning function and the cutoff function. It is removed with a tongue-like piece to achieve the target value with high accuracy.
In addition, it can be easily adjusted, and the cover 13 can block the adverse effects of attaching the cap 12, so that the adjusted target value can be maintained. In other words, in this embodiment, a metal plate cover 13 is attached in advance so that the resonance frequency does not change even when the cap 12 is attached, and the influence of the cover 13 is corrected by the tongue-shaped piece 14. It is.

Furthermore, since the tuning mechanism of this embodiment is housed in a case and does not have a case penetration part that impairs airtightness unlike the conventional tuning mechanism, airtightness can be easily improved.

In the above embodiment, the tongue-like piece 14 is formed as a tuning mechanism, but this can also be realized by appropriately selecting legs 13a having different heights, as described above, or by using a known method. This can also be achieved by adding resonance frequency adjustment means to the cover 13.

In addition, in the above embodiment, an oscillator was taken as an example, but
The present invention is applicable not only to oscillators but also to any dielectric resonator device having a tuning mechanism such as a filter.

〔Effect of the invention〕

As described above, according to the dielectric resonator device according to the present invention, a metal member having a function of blocking the influence of the outer case on the resonant frequency is placed in the sealed housing case in which the outer case is fitted to the substrate. A plate cover is placed to cover the dielectric resonator, and the cover has a tuning function to adjust the resonant frequency of the dielectric resonator to the target value, so the resonant frequency of the dielectric resonator can be adjusted to the target value. It has the effect of being able to adjust the value accurately and easily improving airtightness.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of a conventional dielectric resonator device (oscillator), FIG. 2 is a cross-sectional side view of an oscillator according to an embodiment of the present invention, and FIGS. 3 and 4 are metal plates of the embodiment. FIG. 5 is a perspective view showing the manufactured cover, and FIG. 5 is a side view thereof. In the figure, 1 is a dielectric resonator, 11 is a hermetic base (substrate), 12 is a cap (exterior case), 13 is a metal plate cover, and 14 is a tongue-like piece (tuning function).

Claims (1)

[Claims] 1. In a dielectric resonator device in which a dielectric resonator and a coupling means for coupling the dielectric resonator to a circuit are housed in a housing case, the housing case is connected to a substrate and an exterior fitted thereto. a metal plate cover configured in a sealed manner with a case, housing the dielectric resonator and coupling means in the housing case, and having a blocking function to block the influence of the exterior case on the resonant frequency; The metal plate cover is located between the dielectric resonator and the exterior case and is arranged to cover the dielectric resonator, and the metal plate cover is arranged to cover the dielectric resonator by adjusting the distance from the dielectric resonator. A dielectric resonator device characterized by having a tuning function for adjusting the resonant frequency of the dielectric resonator to a target value.