JPS6236326Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the package structure of a stripline filter, and in particular, it houses a stripline filter in which a full-surface electrode is formed on one main surface of a dielectric substrate and a resonant electrode is formed on the other main surface. Regarding the package structure.

FIG. 1 is a schematic perspective view showing the elements of a stripline filter, which is the background of this invention. In the figure, a stripline filter element 1 includes a full-surface electrode 3 formed on one main surface of a dielectric substrate 2, and resonant electrodes 41-45 formed on the other main surface. The entire surface electrode 3 is formed extending from one main surface of the dielectric substrate 2 through its side surface to the other main surface. One end of each of the resonant electrodes 41 to 45 is commonly connected to the entire surface electrode 3. That is, the resonant electrodes 41 to 45 are arranged to extend in parallel from one end of the entire surface electrode 3. Such a resonant electrode 41
45 is formed by printing and then baking using a conductive material such as silver. Each resonant electrode 4
Nos. 1 to 45 are constructed as 1/4 wavelength ones, and therefore, each end on the entire surface electrode side is a short-circuit end, that is, the voltage standing wave is zero. Therefore, dimension A in FIG. 1 is chosen to correspond to 1/4 wavelength. Note that the entire surface electrode 3 does not necessarily have to be formed extending to a part of the other main surface, but is formed only on one main surface and the side surface, and the resonant electrode 4
Each end of Nos. 1 to 45 may be connected to a full-surface electrode extending on the side surface thereof. however,
In reality, the length A of the resonant electrodes 41 to 45 may differ from the predetermined value (designed value) due to misalignment of pattern printing, so the entire surface electrode 3 is On the other hand, it is more preferable to extend to the main surface. These resonant electrodes 41 to 4
The mutual spacing of 5 determines the pass (or rejection) bandwidth of this stripline filter 1.

Further, external extraction electrodes 51 and 52 acting as input/output electrodes are provided at the ends of each of the arranged resonance electrodes 41 to 45, that is, 41 and 45.
is formed. These external extraction electrodes 51 and 52
are separated from the short-circuited ends of the resonant electrodes 41 and 45 by a predetermined distance,
It is formed parallel to the

By the way, when mounting the above-mentioned stripline filter element 1 on a printed circuit board, for example, there is a need for a package structure for a stripline filter that can be easily mounted and improve workability.

Therefore, the main objective of this invention is to provide a package structure for a stripline filter that can meet the above-mentioned needs.

In summary, this idea consists of extending the external extraction electrode of the element toward the opening of the conductive case, connecting the extraction terminal to the external extraction electrode, and electrically connecting the element to one inner wall of the conductive case. Moreover, the conductive case is mechanically fixed, and the opening of the conductive case is sealed with a sealing member.

FIG. 2 is a schematic perspective view of a stripline filter element included in one embodiment of the invention. This element 1 is the same as shown in FIG. 1 above, except for the following points. That is, the end portions 31 and 32 of the full surface electrodes formed on the dielectric substrate 2 shown in FIG. It is formed to extend to the side.

FIG. 3 is a perspective view schematically showing a conductive case included in an embodiment of the invention. In the figure, the conductive case 6 is made of metal, for example, and has a box shape with an opening 61 on one side. Attachment terminals 62 to 65 are formed extending outward from the four corners of the opening 61 and serving also as ground terminals.

FIG. 4 is a sectional view of an embodiment of this invention.
In particular, FIG. 4a shows a front sectional view, and FIG. 4b shows a side sectional view.

Next, a method of assembling an embodiment of this invention will be described with reference to FIGS. 2 to 4. First, the second
External lead-out electrodes 53 and 54 of the element 1 shown in the figure are connected to lead-out terminals 8 and 9 as input/output terminals by soldering or the like. Then, the element 1 is housed in the case 6 such that the lead-out terminals 8 and 9 protrude from the opening 61 of the case 6. At this time, the entire surface electrode 3 of element 1
is electrically connected and mechanically fixed to one inner wall of the case 6 by conductive adhesive or soldering 7 or the like. Then, the opening 61 of the case 6 is sealed with a sealing member, such as a rubber seal 10. Furthermore, the opening 61 is sealed by pouring, for example, epoxy resin over the rubber seal 10.

When the strip line filter configured as described above is mounted on a printed circuit board, for example, through holes are formed at positions corresponding to the lead terminals 8 and 9 and the mounting terminals 62 to 65, and the lead terminals 8 and 9 are inserted into the through holes.
Then, the mounting terminals 62 to 65 are inserted and soldered. In this case, the mounting terminals 62 to 65
can be used as a ground terminal. Therefore, according to this embodiment, when the stripline filter is mounted on a printed circuit board or the like, the mounting can be made simple and easy. Furthermore, since the element 1 can be mounted in an upright state, there is an advantage that the installation space can be reduced.

FIG. 5 is a schematic perspective view showing a stripline filter element according to another embodiment of the invention. This element 1 is the same as in FIG. 1 described above except for the following points. That is, the external extraction electrode 5
5 and 56 are formed to extend in the opposite direction to the end portions 31 and 32 of the full-surface electrodes. When this element is housed in the case 6 described above, the lead terminals 8 and 9 may be connected to the external lead electrodes 55 and 56, and the element may be mounted so that the side surface on which the entire surface electrode 3 is formed faces upward. Thereby, the same effect as the stripline filter shown in FIG. 4 can be obtained.

Although the above embodiment describes the case where the resonator has a 1/4 wavelength, those skilled in the art will readily understand that this idea can be similarly applied to a stripline filter using a 1/2 wavelength resonator. will be understood. Furthermore, it goes without saying that it can be used not only as a band pass filter but also as a band rejection filter.

As described above, according to this invention, the entire surface electrode of the element is electrically connected and mechanically fixed to one inner wall of the conductive case, and the external lead terminal of the element is made to extend in the opening direction of the case. Since the external lead electrode is formed, the lead terminal is connected to the external lead electrode, and the opening is sealed with a sealing member, it can be mounted extremely simply and easily on a printed circuit board or the like. Thereby, the installation of the strip line filter does not require any skill, and work efficiency can be improved. Moreover, since the structure is relatively simple, the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing a stripline filter element which is the background of this invention.
FIG. 2 is a schematic perspective view of elements used in one embodiment of the invention. FIG. 3 is a schematic perspective view showing a conductive case used in an embodiment of this invention. FIG. 4 is a sectional view of one embodiment of this invention. FIG. 5 is a schematic perspective view showing elements of another embodiment of the invention. In the figure, 2 is a dielectric substrate, 3 is an entire surface electrode,
41 to 45 are resonance electrodes, 51 to 56 are external extraction electrodes, 6 is a conductive case, 61 is an opening, 7 is a conductive adhesive, 8 and 9 are extraction terminals, 10 is a rubber seal, and 11 is a resin.

Claims (1)

[Claims for Utility Model Registration] A conductive case with an opening on one side, a dielectric substrate, a full-surface electrode formed on one main surface of the dielectric substrate, and an electrode formed on the other main surface of the dielectric substrate. an element that includes a formed resonance electrode and an external extraction electrode connected to the resonance electrode, and is housed in the conductive case, and the external extraction electrode of the element connects the element to the conductive case. When housed in the conductive case, the conductive case is extended to face the opening direction, and further includes a lead terminal connected to the external lead electrode, and electrically connects the entire surface electrode of the element to one inner wall of the conductive case. A package structure for a strip line filter, comprising: a sealing member connected to and mechanically fixed to, and further surrounding the extraction terminal and sealing the opening.