CN113690561B - Preparation method of filter for 5G signal conversion - Google Patents
Preparation method of filter for 5G signal conversion Download PDFInfo
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- CN113690561B CN113690561B CN202111022260.5A CN202111022260A CN113690561B CN 113690561 B CN113690561 B CN 113690561B CN 202111022260 A CN202111022260 A CN 202111022260A CN 113690561 B CN113690561 B CN 113690561B
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- H—ELECTRICITY
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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Abstract
The invention discloses a preparation method of a filter for 5G signal conversion, and relates to the technical field of filter preparation. The invention comprises the following steps: and (3) SS01 ceramic powder granulation: and (4) placing the sieved ceramic powder into a granulator, and granulating the ceramic powder by using the granulator. The manufacturing method of the filter blank is carried out in a step-by-step pressing forming mode, and in the step-by-step pressing process, the adhesive can be sequentially added into the filter blank to reinforce the blank, so that the formed blank of the filter has higher strength, better effect and smaller deformation in the subsequent sintering and shaping process, and simultaneously the processed filter has higher strength and better stability.
Description
Technical Field
The invention belongs to the technical field of filter preparation, and particularly relates to a preparation method of a filter for 5G signal conversion.
Background
Filters, as the name implies, are devices that filter waves. "wave" is a very broad physical concept, and in the field of electronics, is narrowly limited to refer specifically to processes that describe the variation of values of various physical quantities over time. This process is converted into a time function of voltage or current, called time waveform of various physical quantities, or called signal, by the action of various sensors. Since the argument time is continuously valued, it is called a continuous time signal, which is also conventionally called an analog signal.
With the continuous development of modern communication technology, the requirements on filters are higher and higher, and the filter technology with small size, high performance, high power and low cost is very important for filters in wireless communication applications, and under the application condition of 5G array antennas, the size of the existing metal cavity filter can not meet the requirements of wireless communication systems at all. The common filter is mainly ceramic dielectric filter, and its use and casting process are mature.
The ceramic dielectric filter is a filter prepared by utilizing a microwave dielectric ceramic material, has the characteristics of low loss, stable frequency temperature coefficient, small thermal expansion coefficient, high power capacity, small volume and the like, and is particularly suitable for filtering at all levels of wireless communication systems such as communication base stations, navigation positioning systems, portable equipment and the like. However, with the shortage of communication frequency band resources and the increasing complexity of electromagnetic environment, the wireless communication system puts higher requirements on the size, performance, cost, productivity, etc. of the radio frequency device. The existing ceramic dielectric filter is smaller and smaller in size, so that the internal complex structure is very difficult in the production process, more gaps often appear in the ceramic dielectric filter in the integral casting process, the strength of the ceramic dielectric filter is poor, the working efficiency is influenced to a certain degree, and a plurality of device models with excellent performance cannot be realized, so that the development of the use of the dielectric filter, the duplexer and 5G is severely limited.
Disclosure of Invention
The invention aims to provide a preparation method of a filter for 5G signal conversion, which is characterized in that a blank of the filter is manufactured in a step-by-step compression molding mode, and in the step-by-step compression process, an adhesive can be sequentially added into the blank of the filter to reinforce the blank, so that the formed blank of the filter has higher strength, better effect and smaller deformation in the subsequent sintering and shaping process, and the processed filter has higher strength and better stability, thereby not only obviously improving the performance of the filter, but also reducing the production error of the filter.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a preparation method of a filter for 5G signal conversion, which comprises the following steps:
and (3) granulating SS01 ceramic powder: placing the sieved ceramic powder into a granulator, and granulating the ceramic powder by using the granulator;
SS02 granulated ceramic pellet: placing the granulated and formed ceramic in a plurality of separated dies in sequence, and performing compression forming on the granulated ceramic by using a forging press to form a plurality of ceramic dry pressing blank sheets;
pressing SS03 ceramic rough blank: stacking the ceramic dry pressing blank sheets subjected to preliminary pressing in the ceramic rough blank forming die in sequence according to the serial number sequence of the separation die, coating an adhesive between the two ceramic dry pressing blank sheets which are stacked mutually for connecting the ceramic dry pressing blank sheets, and performing press forming on the stacked ceramic dry pressing blank sheets by using the forging press again to complete the press forming of the ceramic rough blank;
And (3) binder removal and sintering of the SS04 ceramic rough blank: heating the formed ceramic rough blank at the temperature rise rate of 0.5-5 ℃/min, carrying out heat preservation, glue removal and sintering for 8-40h at the temperature of 150-1600 ℃, and cooling at room temperature to obtain a ceramic block;
processing of SS05 filter: and grinding and polishing the sintered and molded ceramic block, and then preparing an electrode on the ceramic block to obtain the ceramic dielectric filter.
Further, the adhesive comprises 60-90 wt% of oligomer, 5-10 wt% of reaction diluent, 1-4 wt% of photoinitiator, 0.1-1 wt% of thermal polymerization inhibitor and 5-10 wt% of leveling agent, and is prepared by mixing the raw materials through magnetic stirring for 5-10h and then heating to 60-80 ℃.
Further, the oligomer is epoxy acrylate, the reaction diluent is N-vinyl pyrrolidone, the photoinitiator is benzoin dimethyl ether, the thermal polymerization inhibitor is hydroquinone, and the leveling agent is BYK-057.
Further, the dielectric constant epsilon of the ceramic block in the step 4 is 8-120.
Further, the rubber discharge treatment in the step 4 is divided into four stages: in the first stage, the temperature is raised to 150-200 ℃ at the speed of 3-5 ℃/min, and the temperature is kept for 30-80 min; in the second stage, the temperature is raised to 400-450 ℃ at the speed of 0.5-1.5 ℃/min, and the temperature is kept for 360 min; the third stage, the temperature is continuously increased to 600-700 ℃ at the speed of 0.5-1.5 ℃/min, and the temperature is preserved for 100-160 min; and in the fourth stage, the temperature is reduced according to 0.5-1 ℃/min, and the ceramic rough blank is subjected to rubber discharge.
Further, the sintering treatment in the step 4 is divided into four stages: in the first stage, the temperature is raised to 150-200 ℃ at the speed of 3-5 ℃/min, and the temperature is kept for 30-150 min; in the second stage, the temperature is raised to 500-700 ℃ according to 1-3 ℃/min, and the temperature is kept for 60-120 min; in the third stage, the temperature is raised to the ceramic sintering temperature according to the temperature of 4-7 ℃/min, and the temperature is kept for 300 min; and in the fourth stage, cooling to finish sintering the ceramic block.
Further, the glue discharging and sintering treatment in the step 4 are both performed under protective gas or active gas, the active gas is oxygen or hydrogen, and the protective gas is nitrogen.
The invention has the following beneficial effects:
the manufacturing method of the filter blank is carried out in a step-by-step pressing forming mode, and in the step-by-step pressing process, the adhesive can be sequentially added into the filter blank to reinforce the blank, so that the formed blank of the filter has higher strength, better effect and smaller deformation in the subsequent sintering and shaping process, and simultaneously the processed filter has higher strength and better stability.
Of course, it is not necessary for any product to practice the invention to achieve all of the above-described advantages at the same time.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention relates to a preparation method of a filter for 5G signal conversion, which comprises the following steps:
and (3) granulating SS01 ceramic powder: placing the sieved ceramic powder into a granulator, and granulating the ceramic powder by using the granulator;
SS02 granulated ceramic pellet: placing the granulated and formed ceramic in a plurality of separated dies in sequence, and performing compression forming on the granulated ceramic by using a forging press to form a plurality of ceramic dry pressing blank sheets;
pressing SS03 ceramic rough blank: sequentially stacking a plurality of preliminarily pressed ceramic dry pressing sheets in a ceramic rough blank forming die according to the serial number sequence of a separation die, coating an adhesive prepared from 80 wt% of epoxy acrylate, 7.2 wt% of N-vinyl pyrrolidone, 2.7% of benzoin dimethyl ether, 0.6 wt% of hydroquinone and 9.5 wt% of BYK-057 between the two stacked ceramic dry pressing sheets, stirring for 8 hours by magnetic force, heating to 75 ℃ for connecting the ceramic dry pressing sheets, and performing press forming on the stacked ceramic dry pressing sheets by using a forging press again to finish the press forming of the ceramic rough blank;
And (3) binder removal and sintering of the SS04 ceramic rough blank: heating the formed ceramic rough blank to carry out glue discharging treatment, wherein the glue discharging treatment comprises four stages: in the first stage, the temperature is raised to 170 ℃ at the rate of 3 ℃/min, and the temperature is kept for 60 min; in the second stage, the temperature is raised to 440 ℃ according to 1.2 ℃/min, and the temperature is kept for 300 min; in the third stage, the temperature is continuously increased to 670 ℃ at the speed of 0.8 ℃/min, and the temperature is kept for 120 min; fourthly, cooling according to 1 ℃/min to finish the rubber discharging of the ceramic rough blank; then, the sintering treatment is carried out, and the sintering treatment is also divided into four stages: in the first stage, the temperature is raised to 160 ℃ at the rate of 3 ℃/min, and the temperature is kept for 80 min; in the second stage, the temperature is raised to 700 ℃ according to the speed of 2 ℃/min, and the temperature is kept for 80 min; in the third stage, the temperature is raised to the ceramic sintering temperature according to the speed of 6 ℃/min, and the temperature is kept for 180 min; step four, cooling to finish sintering the ceramic blocks; the binder removal and sintering treatment are carried out under nitrogen, and the dielectric constant epsilon of the ceramic block is 49;
processing of SS05 filter: and grinding and polishing the sintered and molded ceramic block, and then preparing an electrode on the ceramic block to obtain the ceramic dielectric filter.
Example 2
The invention relates to a preparation method of a filter for 5G signal conversion, which comprises the following steps:
and (3) SS01 ceramic powder granulation: placing the sieved ceramic powder into a granulator, and granulating the ceramic powder by using the granulator;
SS02 granulated ceramic pellet: placing the granulated and formed ceramic in a plurality of separated dies in sequence, and performing compression forming on the granulated ceramic by using a forging press to form a plurality of ceramic dry pressing blank sheets;
pressing SS03 ceramic rough blank: sequentially stacking a plurality of preliminarily pressed ceramic dry pressing blank sheets in a ceramic rough blank forming die according to the serial number sequence of a separation die, coating an adhesive prepared from 85 wt% of epoxy acrylate, 7.5 wt% of N-vinyl pyrrolidone, 1.6 wt% of benzoin dimethyl ether, 0.5 wt% of hydroquinone and 5.4 wt% of BYK-057 between the two ceramic dry pressing blank sheets which are stacked mutually, stirring for 8 hours by magnetic force, heating to 75 ℃ for connecting the ceramic dry pressing blank sheets, and performing press forming on the plurality of stacked ceramic dry pressing blank sheets by using a forging press again to complete the press forming of the ceramic rough blank;
and (3) carrying out binder removal and sintering on the SS04 ceramic rough blank: heating the formed ceramic rough blank to carry out glue discharging treatment, which comprises four stages: in the first stage, the temperature is raised to 170 ℃ at the rate of 3 ℃/min, and the temperature is kept for 60 min; in the second stage, the temperature is raised to 440 ℃ according to 1.2 ℃/min, and the temperature is kept for 300 min; in the third stage, the temperature is continuously increased to 670 ℃ at the speed of 0.8 ℃/min, and the temperature is kept for 120 min; fourthly, cooling according to 1 ℃/min to finish the rubber discharging of the ceramic rough blank; then, the sintering treatment is carried out, and the sintering treatment is also divided into four stages: in the first stage, the temperature is raised to 160 ℃ at the rate of 3 ℃/min, and the temperature is kept for 80 min; in the second stage, the temperature is raised to 700 ℃ according to the speed of 2 ℃/min, and the temperature is kept for 80 min; in the third stage, the temperature is raised to the ceramic sintering temperature according to the speed of 6 ℃/min, and the temperature is kept for 180 min; step four, cooling to finish sintering the ceramic blocks; the binder removal and sintering treatment are carried out under nitrogen, and the dielectric constant epsilon of the ceramic block is 55;
Processing of SS05 filter: and grinding and polishing the sintered and molded ceramic block, and then preparing an electrode on the ceramic block to obtain the ceramic dielectric filter.
Example 3
The invention relates to a preparation method of a filter for 5G signal conversion, which comprises the following steps:
and (3) SS01 ceramic powder granulation: placing the sieved ceramic powder into a granulator, and granulating the ceramic powder by using the granulator;
SS02 granulated ceramic pellet: placing the granulated and formed ceramic in a plurality of separated dies in sequence, and performing compression forming on the granulated ceramic by using a forging press to form a plurality of ceramic dry pressing blank sheets;
pressing SS03 ceramic rough blank: sequentially stacking a plurality of preliminarily pressed ceramic dry pressing blank sheets in a ceramic rough blank forming die according to the serial number sequence of a separation die, coating an adhesive prepared from 85 wt% of epoxy acrylate, 7.5 wt% of N-vinyl pyrrolidone, 1.6 wt% of benzoin dimethyl ether, 0.5 wt% of hydroquinone and 5.4 wt% of BYK-057 between the two ceramic dry pressing blank sheets which are stacked mutually, stirring for 5 hours by magnetic force, heating to 80 ℃ for connecting the ceramic dry pressing blank sheets, and performing press forming on the plurality of stacked ceramic dry pressing blank sheets by using a forging press again to complete the press forming of the ceramic rough blank;
And (3) carrying out binder removal and sintering on the SS04 ceramic rough blank: heating the formed ceramic rough blank to carry out glue discharging treatment, which comprises four stages: in the first stage, the temperature is raised to 170 ℃ at the rate of 3 ℃/min, and the temperature is kept for 60 min; in the second stage, the temperature is raised to 440 ℃ according to 1.2 ℃/min, and the temperature is kept for 300 min; in the third stage, the temperature is continuously increased to 670 ℃ at the speed of 0.8 ℃/min, and the temperature is kept for 120 min; fourthly, cooling according to 1 ℃/min to finish the rubber discharging of the ceramic rough blank; then, the sintering treatment is carried out, and the sintering treatment is also divided into four stages: in the first stage, the temperature is raised to 160 ℃ at the rate of 3 ℃/min, and the temperature is kept for 80 min; in the second stage, the temperature is raised to 700 ℃ according to the speed of 2 ℃/min, and the temperature is kept for 80 min; in the third stage, the temperature is raised to the ceramic sintering temperature according to the speed of 6 ℃/min, and the temperature is kept for 180 min; step four, cooling to finish sintering the ceramic blocks; the binder removal and sintering treatment are carried out under nitrogen, and the dielectric constant epsilon of the ceramic block is 59;
processing of SS05 filter: and grinding and polishing the sintered and molded ceramic block, and then preparing an electrode on the ceramic block to obtain the ceramic dielectric filter.
Example 4
The invention relates to a preparation method of a filter for 5G signal conversion, which comprises the following steps:
and (3) SS01 ceramic powder granulation: placing the sieved ceramic powder into a granulator, and granulating the ceramic powder by using the granulator;
SS02 granulated ceramic pellet: placing the granulated and formed ceramic in a plurality of separated dies in sequence, and performing compression forming on the granulated ceramic by using a forging press to form a plurality of ceramic dry pressing blank sheets;
pressing SS03 ceramic rough blank: sequentially stacking a plurality of preliminarily pressed ceramic dry pressing blank sheets in a ceramic rough blank forming die according to the serial number sequence of a separating die, coating 80 wt% of epoxy acrylate, 7.2 wt% of N-vinyl pyrrolidone, 2.7% of benzoin dimethyl ether, 0.6 wt% of hydroquinone and 9.5 wt% of BYK-057 between the two stacked ceramic dry pressing blank sheets, stirring for 8 hours by magnetic force, heating to 75 ℃ to prepare an adhesive for connecting the ceramic dry pressing blank sheets, and performing press forming on the plurality of stacked ceramic dry pressing blank sheets by using a forging press again to complete the pressing of the ceramic rough blank;
and (3) carrying out binder removal and sintering on the SS04 ceramic rough blank: heating the formed ceramic rough blank to carry out glue discharging treatment, which comprises four stages: in the first stage, the temperature is raised to 200 ℃ at the rate of 3 ℃/min, and the temperature is kept for 50 min; in the second stage, the temperature is raised to 440 ℃ according to 1.2 ℃/min, and the temperature is kept for 300 min; in the third stage, the temperature is continuously increased to 670 ℃ at the speed of 0.8 ℃/min, and the temperature is kept for 120 min; fourthly, cooling according to 1 ℃/min to finish the rubber discharging of the ceramic rough blank; then, the sintering treatment is carried out, and the sintering treatment is also divided into four stages: in the first stage, the temperature is raised to 200 ℃ at a rate of 4 ℃/min, and the temperature is kept for 50 min; in the second stage, the temperature is raised to 650 ℃ according to the speed of 2 ℃/min, and the temperature is kept for 60 min; in the third stage, the temperature is raised to the ceramic sintering temperature according to the speed of 5 ℃/min, and the temperature is kept for 180 min; step four, cooling to finish sintering the ceramic blocks; the binder removal and sintering treatment are carried out under nitrogen, and the dielectric constant epsilon of the ceramic block is 62;
Processing of SS05 filter: and grinding and polishing the sintered and molded ceramic block, and then preparing an electrode on the ceramic block to obtain the ceramic dielectric filter.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. A preparation method of a filter for 5G signal conversion is characterized by comprising the following steps: the method comprises the following steps:
and (3) SS01 ceramic powder granulation: placing the sieved ceramic powder into a granulator, and granulating the ceramic powder by using the granulator;
SS02 granulated ceramic pellet: placing the granulated and formed ceramic in a plurality of separated dies in sequence, and performing compression forming on the granulated ceramic by using a forging press to form a plurality of ceramic dry pressing blank sheets;
pressing SS03 ceramic rough blank: stacking the ceramic dry pressing blank sheets subjected to preliminary pressing in the ceramic rough blank forming die in sequence according to the serial number sequence of the separation die, coating an adhesive between the two ceramic dry pressing blank sheets which are stacked mutually for connecting the ceramic dry pressing blank sheets, and performing press forming on the stacked ceramic dry pressing blank sheets by using the forging press again to complete the press forming of the ceramic rough blank;
and (3) carrying out binder removal and sintering on the SS04 ceramic rough blank: heating the formed ceramic rough blank at the temperature rise rate of 0.5-5 ℃/min, carrying out heat preservation, glue removal and sintering for 8-40h at the temperature of 150-1600 ℃, and cooling at room temperature to obtain a ceramic block;
processing of SS05 filter: and grinding and polishing the sintered and molded ceramic block, and then preparing an electrode on the ceramic block to obtain the ceramic dielectric filter.
2. The method as claimed in claim 1, wherein the adhesive comprises 60-90 wt% of oligomer, 5-10 wt% of reaction diluent, 1-4 wt% of photoinitiator, 0.1-1 wt% of thermal polymerization inhibitor, and 5-10 wt% of leveling agent, and the adhesive is prepared by mixing the above raw materials by magnetic stirring for 5-10h, and then heating to 60-80 ℃.
3. The method for manufacturing the filter for 5G signal conversion according to claim 2, wherein the oligomer is epoxy acrylate, the reaction diluent is N-vinyl pyrrolidone, the photoinitiator is benzoin dimethyl ether, the thermal polymerization inhibitor is hydroquinone, and the leveling agent is BYK-057.
4. The method for manufacturing a filter for 5G signal conversion according to claim 1, wherein the dielectric constant ε of the ceramic block in step SS04 is 8 to 120.
5. The method as claimed in claim 1, wherein the step of discharging the photoresist in SS04 includes four steps: in the first stage, the temperature is raised to 150-200 ℃ at the speed of 3-5 ℃/min, and the temperature is kept for 30-80 min; in the second stage, the temperature is raised to 400-450 ℃ at the speed of 0.5-1.5 ℃/min, and the temperature is kept for 360 min; the third stage, the temperature is continuously increased to 600-700 ℃ at the speed of 0.5-1.5 ℃/min, and the temperature is preserved for 100-160 min; and in the fourth stage, the temperature is reduced according to 0.5-1 ℃/min, and the ceramic rough blank is subjected to rubber discharge.
6. The method as claimed in claim 1, wherein the sintering process in step SS04 is divided into four stages: in the first stage, the temperature is raised to 150-200 ℃ at the speed of 3-5 ℃/min, and the temperature is kept for 30-150 min; in the second stage, the temperature is raised to 500-700 ℃ according to 1-3 ℃/min, and the temperature is kept for 60-120 min; in the third stage, the temperature is raised to the ceramic sintering temperature according to the temperature of 4-7 ℃/min, and the temperature is kept for 300 min; and in the fourth stage, cooling to finish sintering the ceramic block.
7. The method as claimed in claim 1, wherein the steps of SS04, namely, the steps of binder removal and sintering are performed under a protective gas or under a reactive gas, wherein the reactive gas is oxygen or hydrogen, and the protective gas is nitrogen.
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