CN102810723A - Method for preparing buried medium antenna - Google Patents

Abstract

The invention provides a method for preparing a buried medium antenna, and belongs to the technical field of electromagnetic fields and microwaves. The preparation method comprises the following steps of: totally burying a self-designed copper antenna into a ceramic medium material doped with an yttrium group of rare earth formula to ensure that a metal part of the antenna is not exposed; forming and manufacturing the copper antenna; sintering the copper antenna at a specific temperature; and manually reducing the temperature of the sintered copper antenna to prepare the buried medium antenna of which the metal part of the antenna can be seamlessly integrated with a buried medium. By the ceramic medium, the antenna is subjected to the sintering and is buried into the ceramic medium, so that the antenna can be seamlessly integrated with the ceramic medium to guarantee stable performance; the metal part of the antenna is insusceptible to corrosion and environmental interference on the metal part is reduced; a bismuthic acid barium-based ceramic material is adopted to fill the antenna, and a melting point of the bismuthic acid barium-based ceramic material is lower than that of a copper sheet, so that melting and deformation of the copper sheet in the sintering process are avoided, and the design requirement of the buried medium antenna can be easily met; and therefore, the rate of finished products is improved.

Description

A kind of medium buries the preparation method of antenna

Technical field

The present invention relates to a kind of preparation method, be specifically related to the preparation method that a kind of medium buries antenna, belong to the Electromagnetic Field and Microwave Technology field.

Background technology

At present; Antenna mainly can be divided into electronically small antenna (like the vertical reception antenna of vehicle-mounted amplitude modulation), resonant antenna (like dipole antenna), broad-band antenna (like helical antenna) and aperture antenna (like horn antenna) etc.; And at present these antenna all is the surface of the equipment of being exposed to, these antenna or can not be conformal when installing with equipment, or receive certain limitation during large-scale production; Be exactly that production cost is higher, or being exposed to airborne antenna metal section and part receive oxide etch etc.

Medium buries antenna, as the term suggests exactly antenna is buried one type of antenna in medium.According to design feature medium is buried antenna and made following regulation: medium buries antenna and is meant antenna is all buried in medium; And any edge of each component units of regulation antenna all should and bury between the corresponding any edge of dielectric substrate has certain distance; The edge that is each component units of antenna all must (be seen from substrate side with assurance to the distance of center of antenna less than substrate edge corresponding with it to the distance of center of antenna; Each component units edge of antenna is not exposed at the medium outside), only in this way just can be referred to as medium and bury microstrip antenna.Should be emphasized that; Here it is to be different from the medium cover antenna that present Chinese scholars are being studied that the medium of stipulating buries microstrip antenna; Because the latter only covers medium on the component units of antenna; Simultaneously this covering allows to have between medium and the antenna element slit to exist, and allows the antenna element edge to even up mutually with substrate edge, promptly allows the side open of antenna element; In addition, also have an a kind of part to insert in the medium with antenna, though also there is the foreign scholar to make medium bury antenna, though do not meet the implication of afore mentioned rules, so be not that the said medium of the present invention buries antenna.

Medium buries antenna though begun one's study; But also antenna is not imbedded in the medium fully and with the theory and technology of medium processing all-in-one-piece comparative maturity; Especially also do not have a kind of complete feasible preparation method, because it is big and rate of finished products is low that antenna and medium are processed into the integrated technique difficulty, and antenna is generally copper sheet; Its fusing point is lower; In the selection of medium under the situation that does not influence antenna performance, guarantee in sintering process, can not cause copper sheet to melt distortion again, so difficulty is big.

Summary of the invention

In view of this; The invention provides the preparation method that a kind of medium buries antenna; Through copper antenna integral body all being buried in the ceramic medium material of doped with yttrium group rare-earth prescription; Carry out moulding then and under specified temp sintering, artificially control the medium that makes after temperature is progressively cooled off with the seamless combination of medium and bury antenna.

A kind of medium buries the preparation method of antenna, and its preparation methods steps is following:

Step 1: try to achieve the wavelength of electromagnetic wave at dielectric space according to formula (1-1);

${\mathrm{\λ}}_{\mathrm{\ϵ}}=\frac{{\mathrm{\λ}}_0}{\sqrt{{\mathrm{\ϵ}}_r}}---(1-1)$

Wherein, λ ₀Be the wavelength of electromagnetic wave in free space, λ _εBe the wavelength of electromagnetic wave in dielectric space, ε _rBe dielectric constant;

Step 2: the wavelength X of trying to achieve according to step 1 _ε, again according to formula (2-1) ~ (2-2) calculate in dielectric space between each antenna element apart from d _εLength l with each antenna element _n

d _ε＝k ₁λ _ε； （2-1）

l _n＝K _nk ₂λ _ε； （2-2）

Wherein, k ₁, k ₂, K _nBe coefficient, k ₁Span be [0.2,2.5], k ₂Span be [0.3,0.49], K _n=1-e ^-(n-1), n gets the integer in [1, m], and m is the antenna element number in the antenna;

Step 3: choose l ₁1/10th width as antenna element, thereby confirmed the size of current antenna;

Whether step 4: the size according to current antenna is carried out emulation experiment, and observes the transfer function curve, be the best with the design size of judging current antenna;

Step 5: if the size that step 3 obtains is not best, then repeating step two ~ step 4 is promptly adjusted k ₁, k ₂, K _nUp to the size that obtains optimal antenna;

Step 6: the optimum size that obtains antenna according to step 5 is made antenna element formation bar shaped copper sheet, and with 505 Instant cements each antenna element is fixed on the transparent plastic sheet;

Step 7: choose the yttrium group rare-earth and mix with mass ratio 1/1000 ~ 5/1000, form and bury the doped dielectric material with bismuthic acid barium base ceramic material;

Step 8: the plastic plate that has the bar shaped copper sheet that makes in the step 6 is placed on the center of mould, and fills until the bar shaped copper sheet is buried fully with the doped dielectric material that step 6 makes;

Step 9: the mould after filling in the step 8 is shaken, medium is filled evenly and compression moulding, send in the sintering furnace behind the dismounting mould;

Step 10: control sintering furnace temperature between 850-880 ℃, behind the sintering 3-4h progressively cooling obtain medium and bury antenna.

If the antenna that buries is selected the Yagi spark gap chip aerial for use, then before step 3, need confirm to guide into the quantity in a period of time.

Beneficial effect: (1) the present invention through adopt ceramic dielectric through oversintering with antenna bury with wherein, make antenna and ceramic dielectric seamlessly to organically combine, it is more stable to make medium bury antenna performance; (2) the present invention buries antenna through adopting medium, makes the antenna metal section and part not be vulnerable to corrode and can also reduce the interference of environment to it; (3) the present invention adopts bismuthic acid barium base ceramic material to fill, because the fusing point of bismuthic acid barium base ceramic material is lower than the fusing point of copper sheet, can not cause copper sheet thawing distortion in sintering process, can be easier to reach the designing requirement that medium buries antenna, improves rate of finished products; (4) because the dielectric constant of ceramic dielectric, makes that the electromagnetic wavelength shortening effect in the medium is obvious greater than 4, and the proportional relation of antenna size and wavelength, i.e. the present invention buries antenna through ceramic dielectric can reduce antenna volume.

Description of drawings

Fig. 1 is preparation method's of the present invention flow chart

Fig. 2 is the structure chart of Yagi spark gap chip aerial of the present invention.

Embodiment

Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.

Shown in accompanying drawing 1, the present invention provides a kind of medium to bury the preparation method of antenna, and its preparation methods steps is following:

Step 1: try to achieve the wavelength of electromagnetic wave at dielectric space according to formula (1-1);

${\mathrm{\λ}}_{\mathrm{\ϵ}}=\frac{{\mathrm{\λ}}_0}{\sqrt{{\mathrm{\ϵ}}_r}}---(1-1)$

Wherein, λ ₀Be the wavelength (free space be meant medium be air) of electromagnetic wave in free space, λ _εBe the wavelength of electromagnetic wave in dielectric space, ε _rBe dielectric constant;

Step 2: antenna generally is made up of several antenna elements, and certain distance is arranged between each antenna element; The wavelength X of trying to achieve according to step 1 _ε, again according to formula (2-1) ~ (2-2) calculate in dielectric space between each antenna element apart from d _εLength l with each antenna element _n

d _ε＝k ₁λ _ε； （2-1）

l _n＝K _nk ₂λ _ε； （2-2）

Wherein, k ₁, k ₂, K _nBe coefficient, k ₁Span be [0.2,2.5], k ₂Span be [0.3,0.49], K _n=1-e ^-(n-1), n gets the integer in [1, m], and m is the antenna element number in the antenna.In general m can not surpass 11.

To the Yagi spark gap chip aerial, as shown in Figure 2, it comprises reflection oscillator, excitation oscillator, director dipole, and each oscillator just is meant each antenna element.Wherein director dipole can be for a plurality of, and its quantity is confirmed according to the required value (promptly needing electromagnetic intensity) of antenna gain.

Fig. 2 shows the situation of two director dipoles, m=4 then, the length l of reflection oscillator _r=l ₁, the length 2l of excitation oscillator _s=l ₂, the length of first director dipole is l ₃, the length of second director dipole is l ₄, all utilize formula (2-2) to calculate.

Step 3: choose l ₁1/10th width as antenna element, thereby confirmed the size of current antenna.

Whether step 4: the size according to current antenna is carried out emulation experiment, and observes transfer function curve (it exports electromagnetic intensity curve for antenna), be the best with the design size of judging current antenna.

This is judged as this area routine techniques means, and its waveform through the transfer function curve judges whether antenna performance reaches needed standard, if think that then current antenna is of a size of the best.

Step 5: if the size that step 4 obtains is not best (judging through exporting electromagnetic intensity curve), then repeating step two ~ step 4 is promptly adjusted k ₁, k ₂, K _nUp to the optimum size that obtains antenna.

Step 6: the optimum size that obtains antenna according to step 5 is made antenna element formation bar shaped copper sheet, and with 505 Instant cements each antenna element is fixed on the transparent plastic sheet.

Step 7: choose the yttrium group rare-earth and mix with mass ratio 1/1000 ~ 5/1000, form and bury the doped dielectric material with bismuthic acid barium base ceramic material.

Because the fusing point of bismuthic acid barium base ceramic material is lower than the fusing point of copper sheet; Can not cause copper sheet thawing distortion in sintering process; Can be easier to reach the designing requirement that medium buries antenna, improve rate of finished products, and increase yttrium group rare-earth can improve the magnetic of antenna and the hardness of medium.

Step 8: the plastic plate that has the bar shaped copper sheet that makes in the step 6 is placed on the center of mould, and fills until the bar shaped copper sheet is buried fully, and be full of mould with the doped dielectric material that step 7 makes;

Step 9: the mould after filling in the step 8 is shaken, medium is filled evenly and compression moulding (can be square, cuboid, cylinder and spheroid), send in the sintering furnace behind the dismounting mould;

Step 10: control sintering furnace temperature behind the sintering 3-4h, is artificially controlled temperature and is progressively cooled off and obtain medium and bury antenna between 850-880 ℃.

Embodiment one: the mass ratio of choosing yttrium group rare-earth and bismuthic acid barium base ceramic material is 1/1000, and the temperature of control sintering furnace is behind 850 ℃ and the sintering 3h, artificially controls temperature and progressively cools off and obtain medium and bury antenna.

Embodiment two: the mass ratio of choosing yttrium group rare-earth and bismuthic acid barium base ceramic material is 3/1000, and the temperature of control sintering furnace is behind 860 ℃ and the sintering 3.5h, artificially controls temperature and progressively cools off and obtain medium and bury antenna.

Embodiment three: the mass ratio of choosing yttrium group rare-earth and bismuthic acid barium base ceramic material is 5/1000, and the temperature of control sintering furnace is behind 880 ℃ and the sintering 4h, artificially controls temperature and progressively cools off and obtain medium and bury antenna.

The medium that the foregoing description one ~ embodiment three makes buries antenna, its antenna with bury that medium is seamless organically to be combined into one, its volume is little and functional.

In sum, more than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (2)

1. a medium buries the preparation method of antenna, it is characterized in that its preparation methods steps is following:

Step 1: try to achieve the wavelength of electromagnetic wave at dielectric space according to formula (1-1);

${\mathrm{\λ}}_{\mathrm{\ϵ}}=\frac{{\mathrm{\λ}}_0}{\sqrt{{\mathrm{\ϵ}}_r}}---(1-1)$

Wherein, λ ₀Be the wavelength of electromagnetic wave in free space, λ _εBe the wavelength of electromagnetic wave in dielectric space, ε _rBe dielectric constant;

Step 2: the wavelength X of trying to achieve according to step 1 _ε, again according to formula (2-1) ~ (2-2) calculate in dielectric space between each antenna element apart from d _εLength l with each antenna element _n

d _ε＝k ₁λ _ε； （2-1）

l _n＝K _nk ₂λ _ε； （2-2）

Wherein, k ₁, k ₂, K _nBe coefficient, k ₁Span be [0.2,2.5], k ₂Span be [0.3,0.49], K _n=1-e ^-(n-1), n gets the integer in [1, m], and m is the antenna element number in the antenna;

Step 3: choose l ₁1/10th width as antenna element, thereby confirmed the size of current antenna;

Whether step 4: the size according to current antenna is carried out emulation experiment, and observes the transfer function curve, be the best with the design size of judging current antenna;

Step 5: if the size that step 3 obtains is not best, then repeating step two ~ step 4 is promptly adjusted k ₁, k ₂, K _nUp to the size that obtains optimal antenna;

Step 6: the optimum size that obtains antenna according to step 5 is made antenna element formation bar shaped copper sheet, and with 505 Instant cements each antenna element is fixed on the transparent plastic sheet;

Step 7: choose the yttrium group rare-earth and mix with mass ratio 1/1000 ~ 5/1000, form and bury the doped dielectric material with bismuthic acid barium base ceramic material;

Step 8: the plastic plate that has the bar shaped copper sheet that makes in the step 6 is placed on the center of mould, and fills until the bar shaped copper sheet is buried fully with the doped dielectric material that step 6 makes;

Step 9: the mould after filling in the step 8 is shaken, medium is filled evenly and compression moulding, send in the sintering furnace behind the dismounting mould;

Step 10: control sintering furnace temperature behind the sintering 3-4h, is artificially controlled temperature and is progressively cooled off and obtain medium and bury antenna between 850-880 ℃.

2. a kind of medium as claimed in claim 1 buries the preparation method of antenna, it is characterized in that, if the antenna that buries is selected the Yagi spark gap chip aerial for use, then before step 3, need confirm to guide into the quantity in a period of time.

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