JPH0212041B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a filter device that can be used in high frequency communication equipment.

Conventional Structure and Problems In recent years, as high-frequency communication equipment has become cheaper and more sophisticated, there has been a demand for filter devices that are low-priced and have excellent reliability.

A conventional filter device will be described below with reference to the drawings. FIG. 1 is an exploded view of a conventional filter device. In Figure 1, 1 is a case,
2 is a cover, 3 is a dielectric coaxial resonator, 4 is a dielectric substrate, 5 is a connection terminal, 6 is a hot terminal, 7 is a connection part between the case 1 and the dielectric coaxial resonator 3, and 8 is a ground terminal. be.

The operation of the filter device configured as above will be described below. The dielectric coaxial resonator 3 is made by firing a dielectric material onto a coaxial cylinder.
It has a structure with thick film printing of silver, and works as a λ/4 type resonator. Further, the dielectric substrate 4 is provided with an electrode made by thick film printing of silver, and between the hot terminal 6 and the dielectric coaxial resonator 3,
and act as a capacitor for capacitively coupling the dielectric coaxial resonators 3 to each other. 5 is a terminal for connecting the dielectric coaxial resonator 3 and the dielectric substrate 4; furthermore, the case 1 and the cover 2 serve as ground planes while fixing the dielectric coaxial resonator 3;
The whole constitutes a filter device.

However, in the filter device configured as described above, in order to ground the outer peripheral surface of the dielectric coaxial resonator 3, the case 1 and the cover 2 are divided, and the connecting portion 7 of the cover 2 is first connected to the dielectric coaxial resonator 3. It is necessary to solder the outer circumferential surface of case 3 and ground it, and then put it on case 1 and solder this case 1 and cover 2. Since the case 1 and cover 2 are separated, the number of parts increases, Soldering was also required at two locations: between the cover 2 and the dielectric coaxial resonator 3, and between the cover 2 and the case 1, resulting in poor workability.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a filter device that has a small number of parts and has good workability.

Structure of the Invention In order to achieve this object, the filter device of the present invention includes a window on the side surface of the case, a protrusion for soldering inside the window, and a dielectric coaxial resonator that connects the protrusion with a soldering part. This means that the number of parts is small and the workability is good.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is an exploded perspective view of a filter device in one embodiment of the present invention. In FIG. 2, 9 is a cap-shaped case, 10 is a protrusion for soldering formed in a window provided on one side of the case 9, and 11 is a cap-shaped case.
is the ground terminal. 12 is a dielectric coaxial resonator, which is provided on a dielectric substrate 13. 14 is a connection terminal, and 15 is a hot terminal.

The operation of the filter device of this embodiment configured as described above will be described below. The dielectric coaxial resonator 12 has a structure in which a dielectric is fired into a coaxial cylinder shape and a thick film of silver is printed on it.
It works as a λ/4 type resonator. Further, the dielectric substrate 13 is provided with electrodes made by thick film printing of silver, and the capacitors are connected between the hot terminal 15 and the dielectric coaxial resonators 12, and between the dielectric coaxial resonators 12, respectively. It works as a coupling capacitor. 14 is a dielectric coaxial resonator 12
This is a terminal for connecting the dielectric substrate 13 and the dielectric substrate 13. Now, the characteristic point of this embodiment is that a window is provided on the side surface of the case 9 as shown in FIG. It is connected to the resonator 12 by solder 16, and the outer peripheral surface of the dielectric coaxial resonator is grounded.

Effects of the Invention As is clear from the above description, the present invention provides a case covering a dielectric coaxial resonator on a dielectric substrate, a window is provided on the side surface of the case, and a protrusion for soldering is provided in the window. The structure is such that this protruding part is directly soldered to the dielectric coaxial resonator, making it possible to securely ground the case. This reduces the number of parts in the case compared to the conventional case, and eliminates the need for the process of assembling the case, resulting in improved workability.

[Brief explanation of drawings]

Fig. 1 is an exploded view of a conventional filter device, Fig. 2 is an exploded view of a filter device according to an embodiment of the present invention, and Fig. 3 is a partially cutaway perspective view showing the configuration of the above embodiment. . 9...Case, 10...Protrusion for soldering, 1
1... Earth terminal, 12... Dielectric coaxial resonator,
13... Dielectric substrate, 14... Connection terminal, 15...
...Hot terminal, 16...Solder.

Claims (1)

[Claims] 1 comprising a dielectric substrate, a dielectric coaxial resonator provided on the dielectric substrate, and a case covering the dielectric coaxial resonator on the dielectric substrate, with a window provided on a side surface of the case; . A filter device characterized in that a protrusion for soldering is formed within the window, and the protrusion is directly soldered to the dielectric coaxial resonator.