CN103296345B - A kind of medium of dielectric filter and attaching method thereof - Google Patents

Abstract

The invention provides a medium of a dielectric filter, including a vibrator and a support body and an adhesive layer bonding the vibrator and the support body, the adhesive adopts a ceramic-glass composite adhesive, and the composite adhesive The agent includes glass powder, ceramic powder and solvent, and also involves this connection method. Ceramic-glass composite powder is used to bond the vibrator and support body by melting, cooling and solidification, and ceramic-glass composite adhesive is used to replace traditional organic glue. This kind of filter not only has high temperature resistance and low loss, but also meets the needs of current dielectric filters; ceramic powder of the same material as the vibrator and support body is also added to the traditional glass powder, which prevents the thermal stress generated during cooling and solidification. Adhesive breaks.

Description

A medium of a dielectric filter and its connection method

【Technical field】

The invention relates to a filter in the communication field, in particular to a medium of a dielectric filter and a connection method thereof.

【Background technique】

Filters are needed in modern communications. Traditional metal cavity filters are large in size and weight, and dielectric filters are the way to achieve miniaturization. The medium is composed of a ceramic vibrator and a ceramic support body. The ceramic vibrator and the ceramic support body are generally bonded with organic glue, but the organic glue bond makes the filter not resistant to high temperature, and the dielectric loss is also high. Organic glue is easy to use and has low loss, but its loss is higher than that of glass, and it softens after being heated, and its volatilization phenomenon is not conducive to stable performance.

【Content of invention】

The technical problem to be solved by the present invention is to provide a dielectric filter medium and its connection method, and use ceramic-glass composite adhesive to replace the vibrator and support body of the traditional organic glue bonded filter medium. The filter not only High temperature resistance, low loss, and can also reduce thermal stress generated during cooling.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a medium of a dielectric filter, including a vibrator and a support body and an adhesive layer bonding the vibrator and the support body, and the adhesive is made of ceramic-glass A composite binder, the composite binder includes glass powder, ceramic powder and solvent.

The vibrator is made of ceramic powder A with a dielectric constant of 35-60 and a loss tangent angle of less than 0.0001.

As a further improvement, the ceramic powder A is preferably a BaTiO ₃ system or a MgTiO ₃ -CaTiO ₃ system.

The support body is made of ceramic powder B with a dielectric constant less than 10 and a loss tangent angle less than 0.0001.

As a further improvement, the ceramic powder B is preferably Al ₂ O ₃ , cordierite or mullite.

The ceramic powder is a mixed ceramic powder of ceramic powder A and ceramic powder B.

The glass powder is preferably BaO-B ₂ O ₃ -CuO system or Bi ₂ O ₃ -ZnO-CuO-B ₂ O ₃ system.

A method for preparing a medium of a dielectric filter, the preparation method comprising the following steps:

Mix ceramic powder A, ceramic powder B, glass powder and solvent to prepare slurry;

apply the slurry to one end of the vibrator and one end of the support respectively and dry;

Close the end faces coated with the slurry face to face, and fix the vibrator and the support body as a whole;

The fixed whole is heated to melt the glass powder in the slurry and kept warm, and then cooled and solidified.

The vibrator is made of ceramic powder A with a dielectric constant of 35-60 and a loss tangent angle of less than 0.0001.

As a further improvement, the ceramic powder A is preferably a BaTiO ₃ system or a MgTiO ₃ -CaTiO ₃ system.

The support body is made of ceramic powder B with a dielectric constant less than 10 and a loss tangent angle less than 0.0001.

As a further improvement, the ceramic powder B is preferably Al ₂ O ₃ , cordierite or mullite.

The ceramic powder is a mixed ceramic powder of ceramic powder A and ceramic powder B.

The glass powder is preferably BaO-B ₂ O ₃ -CuO system or Bi ₂ O ₃ -ZnO-CuO-B ₂ O ₃ system.

The beneficial effects of the present invention are as follows: ceramic-glass composite powder is used to bond the vibrator and the support body through melting, cooling and solidification, and the ceramic-glass composite adhesive is used to replace the traditional organic glue. Low, meeting the needs of the current dielectric filter; ceramic powder of the same material as the vibrator and support body is also added to the traditional glass powder, which prevents the thermal stress generated during the cooling and solidification process from breaking the adhesive.

【detailed description】

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

A medium for a dielectric filter, including a vibrator and a support body and a ceramic-glass composite adhesive bonding the vibrator and the support body. In this embodiment, the vibrator uses a dielectric constant of 35-60 and a loss tangent angle of less than 0.0001 Made of ceramic powder A, preferably BaTiO ₃ system or MgTiO ₃ -CaTiO ₃ system, the support body is made of ceramic powder B with a dielectric constant less than 10 and a loss tangent angle less than 0.0001, preferably Al ₂ O _3. Cordierite or mullite; and the composite binder includes glass powder, ceramic powder A, ceramic powder B and solvent, wherein the glass powder is preferably BaO-B ₂ O ₃ -CuO system or Bi ₂ O ₃ -ZnO -CuO-B ₂ O ₃ system.

Embodiment one

The connection method between the vibrator and the support body is as follows:

Mix 50% of the glass powder, 25% of the ceramic powder A and 25% of the ceramic powder B by mass percentage to form a ceramic-glass-based slurry; adding ceramic powder with the same composition as the vibrator and the support to the glass powder is to Prevent the thermal stress generated during cooling and solidification from breaking the adhesive;

Coating a layer of ceramic-glass-based slurry on one end of the vibrator and one end of the support body and drying;

Close the end faces coated with the ceramic-glass base paste face to face, and fix the vibrator and the support as a whole;

Put the fixed whole into the furnace and start heating. Slowly raise the temperature from room temperature to about 170°C at a rate of 3°C/min~4°C/min and keep it warm for about 50 minutes. After the organic solvent is completely removed to prevent ceramic-glass based slurry The material produces a large number of bubbles during the melting process;

Then increase the temperature at a rate of 5°C/min to the melting temperature of the glass powder at 600°C~700°C, and keep the temperature for 40 minutes to completely melt the glass powder;

Finally, the temperature is rapidly lowered to room temperature at a rate of 10°C/min, and the glass powder changes from a molten state to a solid, so that the vibrator and the support body are bonded as a whole.

Of course, the glass powder in this embodiment can use the BaO-B ₂ O ₃ -CuO system, or the Bi ₂ O ₃ -ZnO-CuO-B ₂ O ₃ system; The method bonds the vibrator and the support body, and replaces the traditional organic glue with a ceramic-glass composite adhesive. This filter not only has high temperature resistance and low loss, but also prevents the thermal stress generated during the cooling and solidification process from making the adhesive Fracture, to meet the needs of the current dielectric filter.

Embodiment two

60% glass powder, 20% ceramic powder A and 20% ceramic powder B are mixed into ceramic-glass based slurry by mass percentage;

Coating a layer of ceramic-glass-based slurry on one end of the vibrator and one end of the support body and drying;

Close the end faces coated with the ceramic-glass base paste face to face, and fix the vibrator and the support as a whole;

Put the fixed whole into the furnace and start heating. Slowly raise the temperature from room temperature to about 160°C at a rate of 3°C/min~4°C/min and keep it warm for about 45 minutes. After the organic solvent is completely removed to prevent ceramic-glass based slurry The material produces a large number of bubbles during the melting process;

Then increase the temperature at a rate of 5°C/min to the melting temperature of the glass powder at 600°C~700°C, and keep the temperature for 40 minutes to completely melt the glass powder;

Finally, the temperature is rapidly lowered to room temperature at a rate of 10°C/min, and the glass powder changes from a molten state to a solid, so that the vibrator and the support body are bonded as a whole.

Of course, the mass percentages of glass powder, ceramic powder A and ceramic powder B can be set according to actual needs.

The ceramic-glass composite powder is used to bond the vibrator and the support body through melting, cooling and solidification, and the traditional organic glue is replaced by the ceramic-glass composite adhesive. This filter is not only high temperature resistant and low loss, but also prevents the The thermal stress generated during the cooling and solidification process breaks the adhesive, meeting the needs of current dielectric filters.

Embodiment three

The prepared ceramic-glass-based paste can also be coated only on one end of the vibrator or one end of the support body, and the vibrator and the support body are joined together so that they are bonded as a whole. Other steps are the same as in Embodiment 1.

Embodiment four

The fourth embodiment differs from the above embodiments in that two different ceramic-glass-based slurries can be prepared, one of which is coated on one end of the vibrator, and the other is coated on one end of the support. , and then the end faces coated with different ceramic-glass based slurries were bonded together. Other steps are the same as in Embodiment 1.

Embodiment five

The fifth embodiment differs from the above embodiments in that multiple ceramic-glass-based slurries are prepared according to different mass percentages and coated on one end of the vibrator and/or one end of the support multiple times. Other steps are the same as in the first embodiment, and can also achieve The purpose of the present invention is to reduce thermal stress, reduce loss and resist high temperature.

In the above embodiments, the present invention is only described as an example, but those skilled in the art can make various modifications to the present invention without departing from the spirit and scope of the present invention after reading this patent application.

Claims (4)

1. a kind of medium of dielectric filter, including oscillator and supporter and the adhesive phase for bonding oscillator and supporter, it is special Levy and be, described adhesive uses ceramics-glass composite adhesive, the composite adhesive includes glass dust, ceramic powder And solvent；The ceramic powder is ceramic powder A and ceramic powder B hybrid ceramic powder；The composite adhesive is by mass percent 50%~60% glass dust, 20%~25% ceramic powder A and 20%~25% ceramic powder B are mixed into；The oscillator is adopted It is that dielectric constant is made for the ceramic powder A that 35~60, loss tangent angle is less than 0.0001, the supporter is used Dielectric constant is less than what ceramic powder B of 10, the loss tangent angle less than 0.0001 was made；Wherein, the oscillator, the supporter and The ceramics-glass composite adhesive is made by following steps：The slurry of the ceramics-glass composite adhesive is applied respectively Oscillator one end and supporter one end and drying are layed onto, the end face for being coated with slurry closes up Face to face, and by oscillator and support Body fixes integral, and the entirety after fixation is put into stove and begun to warm up, by room temperature with 3 DEG C/min~4 DEG C/min speed It is to slowly warm up to 170 DEG C or so and is incubated 50 minutes or so, treats to exclude organic solvent completely, prevent ceramics-glass based sizing from existing A large amount of bubbles are produced in melting process；Then the melting temperature 600 DEG C~700 of glass dust is warming up to 5 DEG C/min speed again DEG C, 40 minutes are incubated, glass dust is completely melt；The last speed fast cooling with 10 DEG C/min is to room temperature, and glass dust is by melting Melt state and be changed into solid, make oscillator Nian Jie with supporter to be overall.

2. the medium of dielectric filter according to claim 1, it is characterised in that the glass dust is preferably BaO-B₂O₃- CuO systems or Bi₂O₃-ZnO-CuO-B₂O₃System.

3. a kind of method for the medium for preparing dielectric filter, it is characterised in that the preparation method comprises the following steps：

Ceramic powder A, ceramic powder B, glass dust and solvent are mixed, slurry is configured to, wherein, by mass percentage by 50%~ 60% glass dust, 20%~25% ceramic powder A and 20%~25% ceramic powder B are mixed into ceramics-glass based sizing；

Oscillator one end and supporter one end and drying is respectively coated in slurry；The oscillator use dielectric constant for 35~ 60th, ceramic powder A of the loss tangent angle less than 0.0001 is made, and the supporter uses dielectric constant less than 10, loss What the ceramic powder B that tangent angle is less than 0.0001 was made；

The end face for being coated with slurry closes up Face to face, and oscillator and supporter are fixed into integral；

Entirety after fixation is heated, makes the glass powder in slurry and insulation, then cools and solidifies；Wherein, will be solid Entirety after fixed, which is put into stove, to be begun to warm up, and 170 DEG C or so are to slowly warm up to 3 DEG C/min~4 DEG C/min speed by room temperature And 50 minutes or so are incubated, treat to exclude organic solvent completely, prevent ceramics-glass based sizing from producing a large amount of gas in melting process Bubble；Then 600 DEG C~700 DEG C of the melting temperature of glass dust is warming up to 5 DEG C/min speed again, 40 minutes is incubated, makes glass Powder is completely melt；The last speed fast cooling with 10 DEG C/min is to room temperature, and glass dust is changed into solid from molten condition, makes oscillator Nian Jie with supporter is overall.

4. the method for the medium according to claim 3 for preparing dielectric filter, it is characterised in that the glass dust is preferred For BaO-B₂O₃- CuO systems or Bi₂O₃-ZnO-CuO-B₂O₃System.