CN111211395B - Preparation method of high-molecular composite material cavity filter - Google Patents
Preparation method of high-molecular composite material cavity filter Download PDFInfo
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Abstract
The invention discloses a preparation method of a high polymer composite cavity filter, which adopts a high polymer matrix composite containing a reinforcing material to prepare a high polymer filter cavity; manufacturing a polymer composite cover plate by adopting a polymer-based composite material containing a reinforcing material; the polymer-based composite material containing the reinforced material is used as a raw material and is subjected to injection molding to form the polymer composite material resonance column; carrying out surface metallization on the polymer composite material cavity, the polymer composite material cover plate and the polymer composite material resonance column through a chemical plating or electroplating process to enable the polymer composite material cavity, the polymer composite material cover plate and the polymer composite material resonance column to be provided with a surface conducting layer; and fastening the polymer composite resonance column on the polymer composite cavity, and installing a tuning screw on the polymer composite cover plate to obtain the polymer composite cavity filter. The light-weight polymer composite cavity filter has the advantages of light weight, simple production process, reduction of production and manufacturing cost and great improvement of product performance.
Description
Technical Field
The invention relates to a preparation process of a radio frequency structural part, in particular to a preparation method of a high polymer composite material cavity filter.
Background
In recent years, with the continuous development of communication technology, the trend of high speed, high density, and multifunctional high performance of products requires the development of mobile communication devices toward miniaturization and light weight. The filter is a core component in a mobile communication base station, and the reduction of the size of the filter greatly contributes to the miniaturization and light weight of mobile communication equipment.
At present, a 5G base station filter can have 3 schemes of a small metal cavity filter, a plastic filter and a ceramic dielectric filter, and the three schemes have advantages and disadvantages respectively.
The small metal cavity filter reduces the size and weight of the filter on the premise of keeping the performance of the filter basically stable by improving the metal processing technology, and meets the requirements of a 5G base station system. Compared with other filters, the small metal cavity filter has stable performance and mature process and can be used commercially quickly. In the 5G low-frequency band, the small metal cavity filter still has competitiveness, but the metal cavity filter still has the problem that the processing process is complicated and the quality is heavier, because of the high requirement of the 5G communication band, the metal cavity filter cavity is firstly subjected to die-casting molding and then is further subjected to fine machining to improve the performance of a product, and the process determines that the cost of the metal cavity is higher.
Disclosure of Invention
The present invention is to solve the problems in the prior art, and aims to provide a method for manufacturing a cavity filter made of a polymer composite material.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a high polymer composite material cavity filter comprises the following steps:
(1) preparing a polymer filter cavity by using a polymer-based composite material containing a reinforcing material as a raw material through injection molding; wherein the polymer-based composite material containing the reinforcing material has a thermal expansion coefficient of 15 to 40 x 10-6/℃；
(2) Manufacturing a polymer composite cover plate by adopting a polymer-based composite material containing a reinforcing material;
(3) the polymer-based composite material containing the reinforced material is used as a raw material and is subjected to injection molding to form the polymer composite material resonance column 3; the polymer-based composite material containing the reinforcing material has a thermal expansion coefficient ranging from 10 to 30 x 10-6/℃；
(4) Carrying out surface metallization on the polymer composite material cavity, the polymer composite material cover plate and the polymer composite material resonance column through a chemical plating or electroplating process to enable the polymer composite material cavity, the polymer composite material cover plate and the polymer composite material resonance column to be provided with a surface conducting layer;
(5) and fastening the polymer composite resonance column on the polymer composite cavity, and installing a tuning screw on the polymer composite cover plate to obtain the polymer composite cavity filter.
The invention further improves that in the step (1), the step (2) and the step (3), the polymer-based composite material containing the reinforcing material comprises 30-95% of polymer matrix material and 5-70% of reinforcing material in percentage by mass.
The invention is further improved in that the polymer matrix material is one or more of unsaturated polyester resin, phenolic resin, epoxy resin, polyphenylene sulfide resin, polyimide resin, polyetherimide resin and polyether ether ketone resin.
The invention is further improved in that the reinforcing material is one or more of carbon fiber, glass fiber, ceramic fiber, high polymer material fiber, inorganic whisker, crystal and powder.
The further improvement of the invention is that in the step (1), the polymer-based composite material containing the reinforcing material comprises 40-95% of polymer matrix material and 5-60% of reinforcing material by mass percent.
The further improvement of the invention is that in the step (2), the polymer-based composite material containing the reinforcing material comprises 30-95% of polymer matrix material and 5-70% of reinforcing material by mass percent.
The further improvement of the invention is that in the step (3), the polymer-based composite material containing the reinforcing material comprises 30-70% of polymer matrix material and 30-70% of reinforcing material by mass percent.
Compared with the prior art, the invention has the beneficial effects that:
1. the cavity filter is prepared by adopting the polymer composite material as the base material, so that the weight of the filter is effectively reduced, and the lightweight of the filter is realized.
2. The high-molecular composite material is formed by injection molding or die pressing, so that the filter can be rapidly prepared, the forming precision of a product can be effectively ensured, and the production cost is reduced.
3. The filter cavity and the resonator are prepared from the polymer composite materials with different thermal expansion coefficients, so that the design space of the filter can be effectively enlarged, and the design difficulty is reduced.
4. Compared with a metal cavity filter, the plastic cavity prepared by the invention has light weight and strong rigidity, and the thermal expansion coefficient of the material can be controlled by adjusting the composition of the polymer composite material, so that the cavity of the filter is not easily influenced by the external temperature. In addition, the polymer composite filter can be formed by injection molding or die pressing and other rapid processing technologies, and the forming cost is low.
Drawings
Fig. 1 is a schematic structural view of a chamber prepared by the present invention.
In the figure, 1 is a polymer filter cavity, 2 is a polymer composite cover plate, 3 is a polymer resonance column, and 5 is a tuning screw.
Detailed Description
The technical solutions of the present invention are described in detail below to make them easier to understand and master.
The high polymer composite material adopted by the invention for manufacturing the cavity of the high polymer composite material cavity filter is different from the raw material adopted by the high polymer resonance column, and the high polymer material used for manufacturing the high polymer resonance column has smaller thermal expansion coefficient.
In particular to a polymer composite material for manufacturing a polymer filter cavityDifferent from the raw materials used for manufacturing the high-molecular resonance column, the high-molecular materials used for manufacturing the high-molecular resonance column have smaller thermal expansion coefficients. The range of the thermal expansion coefficient of the high polymer filter cavity material is 15-40 multiplied by 10-6The range of thermal expansion coefficient of the material for manufacturing the polymer resonance column is 10-30 multiplied by 10 DEG C-6/℃。
The high-molecular filter cavity 1 and the high-molecular composite material cover plate can be made of the same material or different materials.
Referring to fig. 1, the polymer composite cavity filter prepared by the invention comprises a polymer filter cavity 1, a polymer resonance column 3, a polymer composite cover plate 2, a tuning screw 5 and a polymer locking screw 4, wherein the polymer cover plate 2 is arranged at the top of the polymer filter cavity 1, the polymer resonance column 3 is fixed in the polymer filter cavity 1 through the polymer locking screw 4, and the tuning screw 5 is arranged on the polymer composite cover plate 2 and extends into the cavity to be matched with a resonator for tuning and selecting frequency.
Wherein, polymer filter cavity 1, polymer resonance post 3 and polymer apron 2 all use macromolecular material as the host material, and polymer filter cavity 1, polymer resonance post 3 and the compound apron 2 surfaces of polymer all cover the conducting layer.
In the invention, the reinforcing material is one or more of carbon fiber, glass fiber, ceramic fiber, high polymer material fiber, inorganic crystal whisker, crystal and powder (the powder is calcium carbonate, silicon dioxide, talcum powder or titanium dioxide).
The following are specific examples.
Example 1
A preparation method of a high polymer composite material cavity filter comprises the following steps:
(1) the chopped glass fiber reinforced polyphenylene sulfide composite material is used as a raw material to prepare a high polymer filter cavity 1 through injection molding, wherein the chopped glass fiber reinforced polyphenylene sulfide composite material comprises 60% of polyphenylene sulfide matrix resin, 20% of reinforcing fibers and 20% of reinforcing particles in percentage by massThe chopped glass fiber reinforced polyphenylene sulfide composite material has a thermal expansion coefficient of 30 multiplied by 10-6/℃。
(2) The polymer composite material cover plate 2 is made of glass fiber cloth reinforced epoxy resin composite materials, wherein the glass fiber cloth reinforced epoxy resin composite materials comprise 45% of epoxy resin and 55% of glass fiber cloth in percentage by mass.
(3) The chopped glass fiber reinforced polyphenylene sulfide composite material is used as a raw material and is subjected to injection molding to form the polymer composite material resonance column 3, wherein the chopped glass fiber reinforced polyphenylene sulfide composite material comprises, by mass, 50% of polyphenylene sulfide matrix resin, 35% of reinforcing fibers (glass fibers), 15% of reinforcing particles (calcium carbonate), and the chopped glass fiber reinforced polyphenylene sulfide composite material has a thermal expansion coefficient of 24 x 10-6/℃。
(4) The surface of the high polymer composite material cavity 1, the high polymer composite material cover plate 2 and the high polymer composite material resonance column 3 is metalized through chemical plating and electroplating processes, so that the high polymer composite material cavity has a good surface conducting layer.
(5) The polymer composite resonator is fastened on the polymer composite cavity 1 by a polymer locking screw 4, then the polymer composite resonator is combined with a polymer composite to obtain a polymer cavity filter, and the filter is tuned by a tuning screw on an assembly and cover plate, so that the polymer cavity filter has good filtering performance.
The obtained filter has good filtering performance and high and low temperature performance, wherein the temperature drift is +/-0.2 MHz within the range of-40-80 ℃.
Example 2
A preparation method of a high polymer composite material cavity filter comprises the following steps:
(1) preparing a polymer filter cavity 1 by using a polymer-based composite material containing a reinforcing material as a raw material through injection molding; wherein the polymer matrix composite material containing the reinforcing material has a thermal expansion coefficient of 15 × 10-6V. C. The polymer-based composite material containing the reinforcing material comprises 30 percent of polymer matrix material and 70 percent of reinforcing material by mass percentageA material.
The polymer matrix material is unsaturated polyester resin.
The reinforcing material is carbon fiber.
(2) A polymer-based composite material containing a reinforcing material is adopted to manufacture a polymer composite material cover plate 2; the polymer-based composite material containing the reinforcing material comprises 60% of a polymer matrix material and 40% of the reinforcing material in percentage by mass. The polymer matrix material is unsaturated polyester resin. The reinforcing material is carbon fiber.
(3) The polymer-based composite material containing the reinforced material is adopted as a raw material and is subjected to injection molding to form the polymer composite material resonant column 3; the polymer-based composite material containing the reinforcing material has a thermal expansion coefficient in the range of 10 x 10-6V. C. The polymer matrix composite material containing the reinforcing material comprises 30% of polymer matrix material and 70% of the reinforcing material in percentage by mass. The polymer matrix material is unsaturated polyester resin. The reinforcing material is carbon fiber.
(4) Carrying out surface metallization on the polymer composite material cavity 1, the polymer composite material cover plate 2 and the polymer composite material resonance column 3 through a chemical plating or electroplating process to enable the polymer composite material cavity, the polymer composite material cover plate and the polymer composite material resonance column to be provided with a surface conducting layer;
(5) fastening the polymer composite resonance column 3 on the polymer composite cavity 1, and installing the tuning screw 5 on the polymer composite cover plate 2 to obtain the polymer composite cavity filter.
Example 3
A preparation method of a high polymer composite material cavity filter comprises the following steps:
(1) preparing a polymer filter cavity 1 by using a polymer-based composite material containing a reinforcing material as a raw material through injection molding; wherein the polymer matrix composite material containing the reinforcing material has a thermal expansion coefficient of 40 × 10-6V. C. The polymer-based composite material containing the reinforcing material comprises 95% of a polymer matrix material and 5% of the reinforcing material in percentage by mass.
The high molecular base material is a mixture of phenolic resin and epoxy resin.
The reinforcing material is a mixture of glass fibers and ceramic fibers.
(2) A polymer-based composite material containing a reinforcing material is adopted to manufacture a polymer composite material cover plate 2; the polymer-based composite material containing the reinforcing material comprises 95% of a polymer matrix material and 5% of the reinforcing material in percentage by mass.
(3) The polymer-based composite material containing the reinforced material is used as a raw material and is subjected to injection molding to form the polymer composite material resonance column 3; the polymer-based composite material containing the reinforcing material has a thermal expansion coefficient in the range of 30X 10-6V. C. The polymer-based composite material containing the reinforcing material comprises 70% of a polymer matrix material and 30% of the reinforcing material by mass percent.
(4) Carrying out surface metallization on the polymer composite material cavity 1, the polymer composite material cover plate 2 and the polymer composite material resonance column 3 through a chemical plating or electroplating process to enable the polymer composite material cavity, the polymer composite material cover plate and the polymer composite material resonance column to be provided with a surface conducting layer;
(5) fastening the polymer composite resonance column 3 on the polymer composite cavity 1, and installing the tuning screw 5 on the polymer composite cover plate 2 to obtain the polymer composite cavity filter.
Example 4
A preparation method of a high polymer composite material cavity filter comprises the following steps:
(1) a polymer-based composite material containing a reinforcing material is adopted as a raw material, and a polymer filter cavity 1 is prepared by injection molding; wherein the polymer matrix composite material containing the reinforcing material has a thermal expansion coefficient of 22 x 10-6V. C. The polymer matrix composite material containing the reinforcing material comprises 45% of a polymer matrix material and 55% of the reinforcing material in percentage by mass.
The polymer matrix material is a mixture of polyphenylene sulfide resin, polyimide resin, polyetherimide resin and polyether-ether-ketone resin.
The reinforcing material is calcium carbonate.
(2) A polymer-based composite material containing a reinforcing material is adopted to manufacture a polymer composite material cover plate 2; the polymer-based composite material containing the reinforcing material comprises 50% of a polymer matrix material and 50% of the reinforcing material in percentage by mass.
(3) The polymer-based composite material containing the reinforced material is used as a raw material and is subjected to injection molding to form the polymer composite material resonance column 3; the polymer-based composite material containing the reinforcing material has a thermal expansion coefficient in the range of 20X 10-6V. C. The polymer matrix composite containing the reinforcing material comprises 50% of a polymer matrix material and 50% of the reinforcing material in percentage by mass.
(4) Carrying out surface metallization on the polymer composite material cavity 1, the polymer composite material cover plate 2 and the polymer composite material resonance column 3 through a chemical plating or electroplating process to enable the polymer composite material cavity, the polymer composite material cover plate and the polymer composite material resonance column to be provided with a surface conducting layer;
(5) fastening the polymer composite resonance column 3 on the polymer composite cavity 1, and installing the tuning screw 5 on the polymer composite cover plate 2 to obtain the polymer composite cavity filter.
Example 5
A preparation method of a high polymer composite material cavity filter comprises the following steps:
(1) preparing a polymer filter cavity 1 by using a polymer-based composite material containing a reinforcing material as a raw material through injection molding; wherein the polymer matrix composite material containing the reinforcing material has a thermal expansion coefficient of 32 x 10-6V. C. The polymer matrix material containing the reinforcing material comprises 60% of the polymer matrix material and 40% of the reinforcing material in percentage by mass.
The polymer matrix material is a mixture of polyimide resin, polyetherimide resin and polyether-ether-ketone resin.
The reinforcing material is a mixture of carbon fibers, glass fibers, ceramic fibers and silicon dioxide.
(2) A polymer-based composite material containing a reinforcing material is adopted to manufacture a polymer composite material cover plate 2; the polymer-based composite material containing the reinforcing material comprises 75% of a polymer matrix material and 25% of the reinforcing material in percentage by mass.
(3) The polymer-based composite material containing the reinforced material is used as a raw material and is subjected to injection molding to form the polymer composite material resonance column 3; the polymer-based composite material containing the reinforcing material has a thermal expansion coefficient in the range of 18 x 10-6V. C. The polymer matrix composite containing the reinforcing material comprises 40% of a polymer matrix material and 60% of the reinforcing material in percentage by mass.
(4) Carrying out surface metallization on the polymer composite material cavity 1, the polymer composite material cover plate 2 and the polymer composite material resonance column 3 through a chemical plating or electroplating process to enable the polymer composite material cavity, the polymer composite material cover plate and the polymer composite material resonance column to be provided with a surface conducting layer;
(5) fastening the polymer composite resonance column 3 on the polymer composite cavity 1, and installing the tuning screw 5 on the polymer composite cover plate 2 to obtain the polymer composite cavity filter.
Example 6
A preparation method of a high polymer composite material cavity filter comprises the following steps:
(1) preparing a polymer filter cavity 1 by using a polymer-based composite material containing a reinforcing material as a raw material through injection molding; wherein the polymer matrix composite material containing the reinforcing material has a thermal expansion coefficient of 35 × 10-6V. C. The polymer matrix composite material containing the reinforcing material comprises 85% of polymer matrix material and 15% of the reinforcing material in percentage by mass.
The polymer matrix material is unsaturated polyester resin and phenolic resin.
The reinforcing material is a mixture of carbon fiber, glass fiber, titanium dioxide and talcum powder.
(2) A polymer-based composite material containing a reinforcing material is adopted to manufacture a polymer composite material cover plate 2; the polymer-based composite material containing the reinforcing material comprises, by mass, 30% of a polymer base material and 70% of the reinforcing material.
(3) The polymer-based composite material containing the reinforced material is used as a raw material and is subjected to injection molding to form the polymer composite material resonance column 3; heat of polymer-based composite material containing reinforcing materialExpansion coefficient range of 28X 10-6V. C. The polymer matrix composite material containing the reinforcing material comprises 65 percent of polymer matrix material and 35 percent of reinforcing material in percentage by mass.
(4) Carrying out surface metallization on the polymer composite material cavity 1, the polymer composite material cover plate 2 and the polymer composite material resonance column 3 through a chemical plating or electroplating process to enable the polymer composite material cavity, the polymer composite material cover plate and the polymer composite material resonance column to be provided with a surface conducting layer;
(5) fastening the polymer composite resonance column 3 on the polymer composite cavity 1, and installing the tuning screw 5 on the polymer composite cover plate 2 to obtain the polymer composite cavity filter.
The filters obtained in examples 1 to 6 had good performance, and the center frequencies and temperature drift ranges (-40 to 85 ℃ C.) are shown in Table 1.
TABLE 1 Filter Performance obtained in examples 1 to 6
| Examples | Cavity CTE | Resonator CTE | Center frequency | Range of temperature drift |
| Example 1 | 30 | 24 | 800MHz | ±0.5MHz |
| Example 2 | 15 | 10 | 2.6GHz | ±5MHz |
| Example 3 | 40 | 30 | 3.5GHz | ±13MHz |
| Example 4 | 22 | 20 | 1.3GHz | ±5MHz |
| Example 5 | 32 | 18 | 900MHz | ±0.2MHz |
| Example 6 | 35 | 28 | 3.5GHz | ±10MHz |
The technical solutions of the present invention are fully described above, it should be noted that the specific embodiments of the present invention are not limited by the above description, and all technical solutions formed by equivalent or equivalent changes in structure, method, or function according to the spirit of the present invention by those skilled in the art are within the scope of the present invention.
Claims (1)
1. A preparation method of a high polymer composite material cavity filter is characterized by comprising the following steps:
1) the chopped glass fiber reinforced polyphenylene sulfide composite material is used as a raw material to be prepared into a high polymer filter cavity (1) through injection molding, wherein the chopped glass fiber reinforced polyphenylene sulfide composite material comprises 60% of polyphenylene sulfide matrix resin, 20% of reinforcing fibers and 20% of reinforcing particles by mass, and the coefficient of thermal expansion of the chopped glass fiber reinforced polyphenylene sulfide composite material is 30 multiplied by 10-6/℃；
2) The polymer composite material cover plate (2) is made of glass fiber cloth reinforced epoxy resin composite materials, wherein the glass fiber cloth reinforced epoxy resin composite materials comprise 45% of epoxy resin and 55% of glass fiber cloth in percentage by mass;
3) the chopped glass fiber reinforced polyphenylene sulfide composite material is used as a raw material and is subjected to injection molding to form a polymer composite material resonance column (3), wherein the chopped glass fiber reinforced polyphenylene sulfide composite material comprises, by mass, 50% of polyphenylene sulfide matrix resin, 35% of glass fiber and 15% of calcium carbonate, and the chopped glass fiber reinforced polyphenylene sulfide composite material has a thermal expansion coefficient of 24 multiplied by 10-6/℃；
4) Carrying out surface metallization on the high polymer composite material cavity (1), the high polymer composite material cover plate (2) and the high polymer composite material resonance column (3) through chemical plating and electroplating processes to enable the high polymer composite material cavity to be provided with a surface conducting layer;
(5) fastening a polymer composite resonator on a polymer composite cavity (1) by using a polymer locking screw (4), then combining the polymer composite resonator with a polymer composite to obtain a polymer cavity filter, and tuning the filter by assembling and tuning screws on a cover plate to ensure that the filter has filtering performance;
the temperature drift of the obtained filter is +/-0.2 MHz within the range of-40-80 ℃.
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Application publication date: 20200529 Assignee: Jiangsu Jinzheng Surface Treatment Technology Co.,Ltd. Assignor: Jiangsu Baoli Jincai Technology Co.,Ltd. Contract record no.: X2023320000166 Denomination of invention: A Preparation Method for Polymer Composite Cavity Filter Granted publication date: 20220517 License type: Common License Record date: 20230710 |