CN211182466U - Thin film dielectric filter - Google Patents
Thin film dielectric filter Download PDFInfo
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- CN211182466U CN211182466U CN202020068922.7U CN202020068922U CN211182466U CN 211182466 U CN211182466 U CN 211182466U CN 202020068922 U CN202020068922 U CN 202020068922U CN 211182466 U CN211182466 U CN 211182466U
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Abstract
The utility model provides a small-sized thin film dielectric filter capable of avoiding the influence of crosstalk of an external circuit, which comprises a thin film circuit substrate and a cover plate on the substrate, wherein the cover plate is formed by laying a metal film on the back surface of a dielectric thin plate, the front surface of the cover plate is a closed circuit, the front surface and the back surface are connected by via holes, and the metal film is laid on the wall of the via hole; the thin film circuit substrate is a circuit substrate, the front surface and the back surface of the thin film circuit substrate are connected through a via hole, a metal film is laid on the wall of the via hole, and the thin film circuit substrate is adhered with a cover plate, so that the filter has a high Q value and smaller insertion loss than a planar filter; the internal circuit of the filter is completely sealed in the thin film dielectric material, so that the crosstalk influence between the filter and an external circuit is effectively avoided; the sealing device can be made, and the reliability grade of the product is improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a dielectric filter.
Background
In a traditional thin film dielectric filter, a circuit is manufactured on a dielectric called an electronic ceramic material by a thin film process, and the traditional thin film dielectric filter is of a single-sided planar circuit structure. The filter with the structure has low Q value and large insertion loss, and can generate crosstalk with other devices of a circuit when in use, thereby influencing the performance indexes of the filter and a circuit system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a small and can avoid receiving the thin film dielectric filter that external circuit crosstalked and influences.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a thin film dielectric filter, characterized by: the thin film circuit substrate and the cover plate are attached to the thin film circuit substrate, the cover plate is formed by laying a metal film on the back surface of the medium thin plate, the front surface of the cover plate is a closed circuit, the front surface and the back surface are connected by a via hole, and the wall of the via hole is laid with the metal film; the thin film circuit substrate is a single-sided filter circuit substrate, the thin film circuit substrate is formed by laying a metal film on the back of a dielectric thin plate, the filter circuit on the front of the thin film circuit substrate is connected with input and output leads at the edge, the front and the back of the thin film circuit substrate are connected by a via hole, and the wall of the via hole is laid with the metal film.
The technical scheme has the following technical effects that as the cover plate is attached to the thin film circuit substrate, the filter is completely positioned in the high dielectric constant material, and compared with a planar filter, the size of the filter is greatly reduced; the filter has high Q value and smaller insertion loss than a plane filter; the internal circuit of the filter is completely sealed in the thin film dielectric material, so that the crosstalk influence between the filter and an external circuit is effectively avoided; the sealing device can be made, and the reliability grade of the product is improved.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a perspective view of the present invention as a separate piece;
FIG. 3 is a front view of the base sheet and the cover sheet of embodiment 1 of the present invention;
figure 4 is a front elevation view of the base and cover sheet of example 2 of the present invention.
Detailed Description
As shown in the figure, the filter comprises a film dielectric filter, a film circuit substrate 10 and a cover plate 20 attached to the film circuit substrate 10, wherein the cover plate 20 is formed by laying a metal film 22 on the back surface of a cover plate dielectric thin plate 21, the front surface of the cover plate 20 is a closed circuit, the front surface and the back surface are connected by a cover plate through hole 23, and the substrate metal film 22 is laid on the wall of the through hole; the thin film circuit substrate 10 is a single-sided filter circuit substrate, the thin film circuit substrate 10 is formed by laying a substrate metal film 12 on the back of a substrate medium thin plate 11, a filter circuit on the front of the thin film circuit substrate 10 is connected with input and output leads 14 and 15 at the edge, the front and the back of the thin film circuit substrate 10 are connected by a substrate through hole 13, and the substrate metal film 12 is laid on the wall of the through hole.
In the above scheme, the thin film circuit substrate 10 is set as a normal closed circuit and a metal film layer, and the area where the closed circuit is located is covered by the cover plate 20, and the two are connected by adopting a bonding or welding method, so that the thin film circuit substrate 10 and the cover plate 20 are integrated into a whole to form the filter with a strip line structure.
Preferably, the filter circuit on the front surface of the thin-film circuit substrate 10 includes strip- shaped resonance bars 121a, 121b each having a shape of a side band 12a and a side band 12b formed by a side band 12a and a side band 12b, which are laid on opposite sides and extend toward each other, at the bottom sides of the side bands 12a and 12b, the strip- shaped resonance bars 121a, 121b are connected to the bottom sides of the side bands 12a and 12b, respectively, through a keyhole 16, a metal film is laid on the wall of the keyhole 16 and is attached to the end face of the keyhole, the ends of the strip- shaped resonance bars 121a, 121b are spaced from the bottom sides of the side bands 12a and 12b, respectively, and input and output leads 14, 15 are connected to the strip- shaped resonance bars 121a, 121b at the outer side portions of the side bands 121a, 121b, respectively, 121b are connected and led out from the notch portion of the "[ ]" -shaped side band.
The dielectric material in the above scheme can be semiconductor, glass, ceramic and other materials used for microwave.
Example 1
The two opposite sides of the front surface of the cover plate 20 are laid with [ ] "shaped side bands which are formed by [ ]" shaped side bands 22a and "]" shaped side bands 22b, and the positions and the areas of the [ ] "shaped side bands on the cover plate 20 are matched with the positions and the areas of the [ ]" shaped side bands on the thin film circuit substrate 10.
Example 2
Auxiliary band- shaped resonance rods 221a and 221b are connected to the "[" -shaped sidebands 22a and "]" -shaped sidebands 22b opposed to the front surface of the cover sheet 20, and the positions and areas of the auxiliary band- shaped resonance rods 221a and 221b on the cover sheet 20 coincide with the positions and areas of the band- shaped resonance rods 121a and 121b on the thin-film circuit substrate 10.
The difference between the embodiment 2 and the embodiment 1 is that the cover sheet 20 is reasonably arranged, and the performance index of the product can be improved.
Claims (4)
1. A thin film dielectric filter, characterized by: the thin-film circuit substrate comprises a thin-film circuit substrate (10) and a cover plate (20) attached to the thin-film circuit substrate (10), wherein the cover plate (20) is formed by laying a cover plate metal film (22) on the back surface of a cover plate medium thin plate (21), the front surface of the cover plate (20) is a closed circuit, the front surface and the back surface are connected through a cover plate through hole (23), and the cover plate metal film (22) is laid on the wall of the through hole; the thin film circuit substrate (10) is a single-sided filter circuit substrate, the thin film circuit substrate (10) is formed by laying a substrate metal film (12) on the back of a substrate medium thin plate (11), a filter circuit on the front side of the thin film circuit substrate (10) is connected with input and output leads (14 and 15) at the edge, the front side and the back side of the thin film circuit substrate (10) are connected through a substrate through hole (13), and the substrate metal film (12) is laid on the wall of the substrate through hole (13).
2. The thin film dielectric filter of claim 1, wherein: the filter circuit on the front surface of the thin film circuit substrate (10) comprises [ ] "shaped sidebands (12a) and" ] "shaped sidebands (12b) which are laid on two opposite sides, band-shaped resonance rods (121a, 121b) which are extended towards each other on the bottom edges of the" [ ] "shaped sidebands (12a) and the" ] "shaped sidebands (12b), key holes (16) are arranged at the connection positions of the band-shaped resonance rods (121a, 121b) and the bottom edges of the connected" [ "-shaped sidebands (12a) and" ] "shaped sidebands (12b), metal films are laid on the hole walls of the key holes (16) and are connected to the end surfaces of the holes, the end parts of the band-shaped resonance rods (121a, 121b) and the bottom edges of the" [ "-shaped sidebands (12a) or the" ] "shaped sidebands (12b) on the opposite sides are arranged at intervals, input leads (14, 15) and the band-shaped resonance rods (121a, 12b) on the opposite sides are respectively, 121b) The band-shaped resonance bars (121a, 121b) at the outer side of the middle part are connected and led out from the notch part of the "[ ]" -shaped side band.
3. The thin film dielectric filter of claim 1 or 2, wherein: the two opposite sides of the front surface of the cover plate (20) are laid with [ ] "-shaped side bands (22a) and [ ]" -shaped side bands (22b) which are formed by outlines, and the positions and the areas of the [ ] "-shaped side bands on the cover plate (20) are matched with the positions and the areas of [ ]" -shaped side bands on the thin-film circuit substrate (10).
4. The thin film dielectric filter of claim 3, wherein: auxiliary strip-shaped resonance rods (221a, 221b) are connected to the [ "-shaped side band (22a) and the [" -shaped side band (22b) which are opposite to the front surface of the cover sheet (20), and the positions and the areas of the auxiliary strip-shaped resonance rods (221a, 221b) on the cover sheet (20) are matched with the positions and the areas of the strip-shaped resonance rods (121a, 121b) on the thin-film circuit substrate (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020068922.7U CN211182466U (en) | 2020-01-11 | 2020-01-11 | Thin film dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020068922.7U CN211182466U (en) | 2020-01-11 | 2020-01-11 | Thin film dielectric filter |
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| Publication Number | Publication Date |
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| CN211182466U true CN211182466U (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020068922.7U Active CN211182466U (en) | 2020-01-11 | 2020-01-11 | Thin film dielectric filter |
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| CN (1) | CN211182466U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024025335A1 (en) * | 2022-07-27 | 2024-02-01 | 주식회사 케이엠더블유 | Filter for communication device |
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2020
- 2020-01-11 CN CN202020068922.7U patent/CN211182466U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024025335A1 (en) * | 2022-07-27 | 2024-02-01 | 주식회사 케이엠더블유 | Filter for communication device |
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