CN216793961U - Broadband filter based on ceramic substrate - Google Patents
Broadband filter based on ceramic substrate Download PDFInfo
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- CN216793961U CN216793961U CN202122501280.2U CN202122501280U CN216793961U CN 216793961 U CN216793961 U CN 216793961U CN 202122501280 U CN202122501280 U CN 202122501280U CN 216793961 U CN216793961 U CN 216793961U
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- ceramic substrate
- cover body
- filter
- shielding cover
- printed circuit
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Abstract
The utility model relates to the technical field of ceramic filters, in particular to a broadband filter based on a ceramic substrate, which comprises a ceramic substrate, a shielding cover body and a printed circuit, wherein the shielding cover body is arranged on the ceramic substrate; the ceramic substrate is used as a bottom plate of the filter, the shielding cover body is connected with the ceramic substrate in a welding mode, and a mounting cavity is formed inside the shielding cover body and used for mounting a plurality of resonators inside the filter; the printed circuit 3 is printed on the upper end face of the ceramic substrate; the utility model has simple integral structure, ensures that the printed circuit can adopt interdigital capacitance connection coupling by optimizing the structures of the ceramic substrate and the resonator in the filter, can realize the reduction of the volume of the filter, and further improves the adaptability to ultra wide band.
Description
Technical Field
The utility model relates to the technical field of ceramic filters, in particular to a ceramic substrate based broadband filter.
Background
After the 5G era, the original 3G and 4G frequency bands are still used, the coexistence of multiple communication systems is a long-term result, the construction space resources of a base station are more and more tense, high requirements are put on the integration and miniaturization of a broadband ceramic duplexer, and the problem of the structure of a miniaturized broadband ceramic filter is urgently needed to be solved due to the fact that a large-bandwidth design and a combined port are difficult to process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a tool which is simple in structure, stable in holding and capable of preventing tin overflow.
A broadband filter based on a ceramic substrate comprises the ceramic substrate, a shielding cover body and a printed circuit;
the ceramic substrate is used as a bottom plate of the filter, the shielding cover body is welded with the ceramic substrate, and an installation cavity is formed inside the shielding cover body and used for installing a plurality of resonators inside the filter; the printed circuit 3 is printed on the upper end face of the ceramic substrate;
furthermore, a plurality of avoiding holes are formed in the shielding cover body;
furthermore, the shielding cover body is a rectangular cover body, and is welded and fixed on the ceramic base by reflow soldering
Further, the thickness of the ceramic substrate 1 is 1-2mm, and the ceramic substrate is prepared by sintering ceramic powder with dielectric constant ER10.09 and QF 51000;
further, the printed circuit is printed and sintered by silver paste, and the conductivity of the silver paste is 6.02e 7S/M;
furthermore, the printed circuit adopts the mutual cascade of electric coupling, and the coupling bandwidth between the internal resonators is increased through interdigital capacitance:
the utility model has simple integral structure, ensures that the printed circuit can adopt interdigital capacitance connection coupling by optimizing the structures of the ceramic substrate and the resonator in the filter, can realize the reduction of the volume of the filter, and further improves the adaptability to the ultra wide band.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
reference numerals: 1-ceramic substrate, 2-shielding cover body, 21-avoiding hole and 3-printed circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, a ceramic substrate based broadband filter includes a ceramic substrate 1, a shielding case 2, and a printed circuit 3;
the ceramic substrate 1 is used as a bottom plate of the filter, the shielding cover body 2 is connected with the ceramic substrate 1 in a welding mode, and an installation cavity is formed inside the shielding cover body and used for installing a plurality of resonators inside the filter; the printed circuit 3 is printed on the upper end surface of the ceramic substrate 1;
further, the shielding cover body 2 is also provided with a plurality of avoiding holes 21;
further, the shielding cover body 2 is a rectangular cover body, and is fixed on the upper end face of the ceramic substrate 1 by reflow soldering;
further, the thickness of the ceramic substrate 1 is 1-2mm, and the ceramic substrate 1 is made by sintering ceramic powder with the dielectric constant of ER10.09 and QF 51000;
further, the printed circuit 3 is printed and sintered by silver paste, the conductivity of the silver paste is 6.02e7S/M, and the frequency loss of the silver paste is less than 0.6dB at 1600-
In the embodiment, the circuit adopting the silver paste printing process has the advantages of low curing temperature, extremely high bonding strength and stable electrical property.
Further, the printed circuit 3 adopts electric coupling to be mutually cascaded, and the coupling bandwidth between the internal resonators is increased through interdigital capacitors;
in the embodiment, the ultra-wideband filter circuit adopts mutual cascade electric coupling, the input and the output adopt a magnetic coupling structure and are composed of 9-order interdigital resonators, the coupling bandwidth is increased by interdigital capacitors among the resonators, and the physical structure of the ultra-wideband filter circuit adopts a size of 36.2 × 14.5 × 7.5mm, so that the relative bandwidth of the whole filter reaches more than 39.2% (1600-2600 MHz).
The utility model has simple integral structure, ensures that the printed circuit can adopt interdigital capacitance connection coupling by optimizing the structures of the ceramic substrate and the resonator in the filter, can realize the reduction of the volume of the filter, and further improves the adaptability to the ultra wide band.
The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications, additions and substitutions for the described embodiments may be made by those skilled in the art without departing from the scope and spirit of the utility model as defined in the accompanying claims.
Claims (6)
1. A broadband filter based on a ceramic substrate is characterized by comprising a ceramic substrate (1), a shielding cover body (2) and a printed circuit (3);
the ceramic substrate (1) is used as a bottom plate of the filter, the shielding cover body (2) is connected with the ceramic substrate (1) in a welding mode, and an installation cavity is formed inside the shielding cover body and used for installing a plurality of resonators inside the filter; the printed circuit (3) is printed on the upper end face of the ceramic substrate (1).
2. The ceramic substrate-based broadband filter according to claim 1, wherein the shielding cover body (2) is further provided with a plurality of avoiding holes (21).
3. The broadband filter based on the ceramic substrate as claimed in claim 1, wherein the shielding case (2) is a rectangular cover body, and is fixed on the upper end face of the ceramic substrate (1) by reflow soldering.
4. The broadband filter based on ceramic substrates of claim 1, wherein the thickness of the ceramic substrate (1) is 1-2mm, and the ceramic substrate (1) is made by sintering ceramic powder with dielectric constant ER10.09 and QF 51000.
5. The ceramic substrate-based broadband filter of claim 1, wherein the printed circuit (3) is printed and sintered by silver paste with a conductivity of 6.02e 7S/M.
6. A ceramic substrate based broadband filter according to claim 1, characterized in that the printed circuits (3) are cascaded to each other with electrical coupling, increasing the coupling bandwidth between the internal resonators by means of interdigital capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122501280.2U CN216793961U (en) | 2021-10-18 | 2021-10-18 | Broadband filter based on ceramic substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122501280.2U CN216793961U (en) | 2021-10-18 | 2021-10-18 | Broadband filter based on ceramic substrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216793961U true CN216793961U (en) | 2022-06-21 |
Family
ID=81999230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122501280.2U Active CN216793961U (en) | 2021-10-18 | 2021-10-18 | Broadband filter based on ceramic substrate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216793961U (en) |
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2021
- 2021-10-18 CN CN202122501280.2U patent/CN216793961U/en active Active
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