JPS5938724Y2 - coaxial resonator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coaxial resonator, and particularly to a coaxial resonator having a structure that is meaningful for manufacturing purposes.

The present inventors have developed and manufactured a coaxial TEM resonator filled with a dielectric material, and the current coaxial TEM resonator has a structure as shown in FIG.

In the figure, reference numeral 1 denotes a quarter-wavelength coaxial TEM resonator, in which a dielectric material 4, such as a titanium oxide ceramic dielectric material, is filled between an inner conductor 2 and an outer conductor 3.

As a specific structure, for example, this 1/4 wavelength coaxial T
The EM resonator 1 is constructed by baking a material having excellent high-frequency conductivity and good adhesion to the dielectric material, such as silver paste, onto the inner wall surface and outer peripheral surface of a thick-walled pipe-shaped dielectric material 4. Let's call it conductor 3.

The interior of the inner conductor 2 is hollow, into which a center rod 5 made of a similar ceramic or the like and having the same axial length as the dielectric 4 is inserted as necessary.

However, a 1/4 wavelength coaxial TEM with such a structure
When constructing a filter using a resonator, there are difficulties, particularly in connection of the resonator with other components.

First, the open end of the resonator is connected to other components, such as another resonator, by capacitive coupling, but when using a capacitor, measures must be taken to secure it.

In addition, the frequency adjustment of a resonator with this type of structure can be done by cutting both end faces of the resonator and changing the axial length.
Therefore, adjustments made especially after being incorporated into the case were inefficient.

Therefore, one object of this invention is to provide a coaxial resonator that can be easily connected to other components when the resonator is used.

One of the objectives of this invention is to provide a coaxial resonator that can simplify the structure of a filter using a resonator and realize a low-cost filter.

One object of this invention is to provide a coaxial resonator with a structure that facilitates frequency adjustment, especially after it is assembled into a case or the like.

In summary, this idea is a coaxial TEM in which a dielectric is present between inner and outer conductors and at least one end surface is open.
This is a coaxial resonator in which an inner conductor is provided with a terminal protruding from an open end surface.

The above-mentioned objects and other objects and features of the present invention will become clearer from the following detailed description with reference to the drawings.

FIGS. 2 to 5 show examples of embodiments of this invention, and parts that are the same as those of the conventional example shown in FIG.

Referring to FIG. 2, numeral 11 shows a coaxial resonator according to an embodiment of the invention, numeral 12 is made of ceramic or the like, and the axial length is longer than the dielectric material 4: +=41J; numeral 13 is an open end surface of the resonator 11. It is an electrode film formed on the surface of the center rod 120 portion 15 protruding from the center rod 14, and is integrally formed with the inner conductor 2.

FIG. 3 is a diagram showing only the main parts of another embodiment of the resonator 21.
A case is shown in which the center rod 12 is not used; in this case, a terminal electrode 22 of an arbitrary shape is inserted into a hole surrounded by the inner conductor 2, fixed, and connected to the inner conductor 2.

On the other hand, 31 and 32 are chip capacitors, and the resonator 21
It is used when capacitively coupling to other parts, such as another resonator or connector.

That is, the upper part of the terminal electrode 22 is shaped appropriately, one electrode 33.34 of the capacitor 31.32 is connected to the other electrode 35.36 of the capacitor 31.32, and one end of the lead wire 37.38 is connected to the other electrode 35.36 of the capacitor 31.32. The other ends of the leads 37, 38 may be connected to, for example, another resonator or connector.

The connection structure of the capacitors 31 and 32 to the terminal electrode 22 is not limited to this, and may be as shown in FIG. 4, for example.

In this case the terminal electrode is illustrated at 41. In these cases, the number of connected capacitors is of course not limited to the above.

It goes without saying that when using a capacitor, the structure shown in FIG. 2 can be applied in place of the terminal electrodes 22.41.

The embodiment shown in FIG. 5 shows a structure for adjusting the number of rotations using the protruding terminals illustrated in FIGS. 2 to 4.

In this case the terminal electrode is illustrated at 51.

Reference numeral 61 denotes a male screw having a conductive component, which is screwed into a female screw formed on the terminal electrode 51, and its protrusion amount l can be adjusted.

The resonant wave number of the resonator 21 is determined by this protrusion amount l.

Of course, other parts such as capacitors 31 and 32 can be added to the terminal electrode 51.

Among these, the resonant frequency can be adjusted by cutting the terminal electrodes themselves and changing their axial lengths without using male screws.

As is clear from the above embodiments, the coaxial resonator of this invention has the effect of facilitating connection with other components.

Further, when a filter is constructed using this resonator, the filter structure becomes simple and a low-cost filter can be realized.

In addition, 0

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional 1/4 wavelength coaxial TEM resonator.
Figure 2 is a sectional view of the first embodiment of the present invention, Figure 3 is a sectional view showing the main parts of the second embodiment of the invention, and Figure 4 is the main part of the third embodiment of the invention. FIG. 5 is a front view showing the main parts of the fourth embodiment of the present invention. 11.21 is a 1/4 wavelength coaxial resonator, 2 is an inner conductor, 3 is an outer conductor, 4 is a dielectric, 13 is an electrode film, 14 is an open end surface,
15 is a protruding portion, 22, 41, and 51 are terminal electrodes.

Claims (1)

[Scope of utility model registration request] A coaxial TEM resonator in which a dielectric material is present between inner and outer conductors and at least one end face is open, and the inner conductor is provided with a terminal protruding from the open end face.