CN116315546A - Design method of surface microprotrusion high-power ferrite circulator - Google Patents
Design method of surface microprotrusion high-power ferrite circulator Download PDFInfo
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Abstract
The invention discloses a design method of a high-power ferrite circulator with a microprotrusion surface, which comprises the following steps: processing to obtain a metal cavity with a boss; processing a plurality of bulges on the surface of a ferrite substrate to obtain ferrite with bulges; ferrite with protrusions is fixed on the boss of the metal cavity. The method of the invention realizes the remarkable improvement of the micro-discharge threshold power of the ferrite circulator on the premise of ensuring the unchanged electrical performance and not additionally increasing the volume and the weight of the microwave component.
Description
Technical Field
The invention belongs to the technical field of high-power special effects of spacecraft microwave components, and particularly relates to a design method of a surface microprotrusion high-power ferrite circulator.
Background
The micro discharge is performed under vacuum or near vacuum environment with lower air pressure P (P is less than or equal to 10) -3 Pa), and secondary electron emission, multiplication, avalanche and discharge effects of the free electrons, which are generated by continuous collision with the microwave component under the action of the electromagnetic field in the microwave component. The high micro discharge risk of the spacecraft high-power ferrite circulator is that the long service life and high availability of the spacecraft effective load are affectedThe key factor of the reliability is also one of the biggest single point failure links of the satellite under the high-power microwave application.
The existing high-power ferrite circulator micro-discharge inhibition method mainly comprises two major categories of optimization structural design and surface treatment. The optimized structural design comprises the increase of volume or the adoption of a special-shaped cavity structure and the like, so that the increase of mass and volume is often brought, and the design requirement on mass and volume minimization in the aerospace industry is not facilitated. The surface-treated high-power ferrite circulator micro-discharge resistance design method can effectively inhibit the micro-discharge threshold. However, the surface treatment has the disadvantages of higher technological requirements, difficult removal of the generated magnetic powder and easy initiation of high-power ignition. In order to further reduce the dependency on the process, the effect of dust at high power.
Disclosure of Invention
The technical solution of the invention is as follows: the design method of the surface microprotrusion high-power ferrite circulator overcomes the defects of the prior art, and achieves remarkable improvement of the micro-discharge threshold power of the ferrite circulator on the premise of ensuring the unchanged electrical performance and not increasing the volume and the weight of microwave components additionally.
In order to solve the technical problems, the invention discloses a design method of a high-power ferrite circulator with a microprotrusion surface, which comprises the following steps:
processing to obtain a metal cavity with a boss;
processing a plurality of bulges on the surface of a ferrite substrate to obtain ferrite with bulges;
ferrite with protrusions is fixed on the boss of the metal cavity.
In the design method of the surface microprotrusion high-power ferrite circulator, the structural shape of the bulge is any one or more of the following shapes: cylindrical, square, and polygonal columns.
In the design method of the surface microprotrusion high-power ferrite circulator, when the structural shape of the bulge is cylindrical, a plurality of bulges are processed on the surface of the ferrite substrate by the following method to obtain ferrite with the bulges:
step (a)11, determining initial structural parameters of the cylindrical protrusion: determining an initial value R of the radius of the circular cross-section of the cylindrical protrusion 0 Initial value of center-to-center distance between two adjacent cylindrical protrusions
Initial value of the height of the cylindrical bulge +.>
Wherein R is 0 The range of the values is as follows: 0.2 mm-lambda/10, lambda representing the operating wavelength;
step 12, processing cylindrical bulges on the surface of the ferrite substrate according to the determined initial structural parameters of the cylindrical bulges to obtain ferrite with the cylindrical bulges meeting the initial structural parameters
Step 13, calculating ferrite with cylindrical protrusions by adopting Monte Carlo simulation method
To obtain ferrite with cylindrical protrusions>
Is used for determining the secondary electron emission characteristics of ferrite with cylindrical protrusions under the condition of vertical incidence of electrons>
Secondary electron emission yield curves of (2);
step 14, ferrite with cylindrical protrusions
Is of the secondary electricity of (2)The sub-emission yield curve is determined based on ferrite with cylindrical protrusions combined with electromagnetic particle algorithm>
Micro-discharge threshold power P of designed ferrite circulator 1 R ；
Step 15, if P 1 R ＞P 0 It is determined that the design requirements are satisfied by using ferrite with cylindrical protrusions
The design of micro discharge resistance of the surface micro-bulge high-power ferrite circulator is realized; wherein P is 0 Representing a micro-discharge threshold power index of the surface micro-bulge high-power ferrite circulator to be designed;
step 16, if P 1 R ≤P 0 The radius of the circular section of the cylindrical bulge, the center distance between two adjacent cylindrical bulges and the height of the cylindrical bulge are adjusted; wherein the radius of the circular section of the cylindrical bulge is selected within the range of 0.2 mm-lambda/10; repeating the steps 13-14 until the micro-discharge threshold power of the designed ferrite circulator is greater than P 0 And processing the cylindrical protrusion on the surface of the ferrite substrate based on the obtained final structural parameters of the cylindrical protrusion to obtain the ferrite with the cylindrical protrusion, which meets the final structural parameters.
In the design method of the surface microprotrusion high-power ferrite circulator, when the structural shape of the embossments is square columns, a plurality of embossments are processed on the surface of the ferrite substrate by the following method, so that ferrite with the embossments is obtained:
step 21, determining initial structural parameters of the square column protrusions: determining an initial value L of side length of square section of square column bulge 0 Initial value of center-to-center spacing of two adjacent square stud bumps
Height of square column bulgeInitial value +.>
Wherein L is 0 The range of the values is as follows: 0.2 mm-lambda/10, lambda representing the operating wavelength;
step 22, processing square column protrusions on the surface of the ferrite substrate according to the determined initial structural parameters of the square column protrusions to obtain ferrite with the square column protrusions meeting the initial structural parameters
Step 23, calculating ferrite with square column protrusions by adopting Monte Carlo simulation method
To obtain ferrite with square column protrusions>
Is used for determining ferrite with square column protrusions under the condition of vertical incidence of electrons>
Secondary electron emission yield curves of (2);
step 24, ferrite with square column protrusions
Is determined based on ferrite with square column protrusions in combination with electromagnetic particle algorithm>
Micro-discharge threshold power P of designed ferrite circulator 1 L ；
Step 25, if P 1 L ＞P 0 The design requirements are met, and ferrite with square column protrusions is adopted
The design of micro discharge resistance of the surface micro-bulge high-power ferrite circulator is realized; wherein P is 0 Representing a micro-discharge threshold power index of the surface micro-bulge high-power ferrite circulator to be designed;
step 26, if P 1 L ≤P 0 The side length of the square section of the square column bulge, the center distance between two adjacent square column bulges and the height of the square column bulge are adjusted; wherein, the side length of the square section of the square column bulge is selected within the range of 0.2 mm-lambda/10; repeating the steps 23-24 until the micro-discharge threshold power of the designed ferrite circulator is greater than P 0 And processing the square column protrusions on the surface of the ferrite substrate based on the obtained final structural parameters of the square column protrusions to obtain ferrite with the square column protrusions, wherein the ferrite meets the final structural parameters.
In the design method of the surface microprotrusion high-power ferrite circulator, when the structural shape of the embossment is a polygonal column, a plurality of embossments are processed on the surface of the ferrite substrate by the following method, so that ferrite with embossments is obtained:
step 31, determining initial structural parameters of the polygonal column bulge: determining an initial value D of the center-to-side distance of the polygonal cross section of the polygonal column protrusion 0 Initial value of center-to-center distance between adjacent two polygonal column protrusions
Initial value of height of polygonal column bulge +.>
Wherein D is 0 The range of the values is as follows: 0.2 mm-lambda/10, lambda representing the operating wavelength;
step 32, processing the polygonal column protrusions on the surface of the ferrite substrate according to the determined initial structural parameters of the polygonal column protrusions to obtain the ferrite with the polygonal column protrusions meeting the initial structural parameters
Step 33, calculating ferrite with polygonal column protrusions by using Monte Carlo simulation method
To obtain ferrite with polygonal column protrusions>
Is used for determining ferrite with polygonal columnar protrusions under the condition of normal incidence of electrons>
Secondary electron emission yield curves of (2);
step 34, ferrite with polygonal column protrusions
Is determined based on ferrite with polygonal columnar projections in combination with electromagnetic particle algorithm>
Micro-discharge threshold power P of designed ferrite circulator 1 D ；
Step 35, if P 1 D ＞P 0 Then confirm to meet the design requirement, adopt ferrite with polygonal column protrusion
Realize high-power ferrite with micro-protrusions on surfaceA body circulator is designed to resist micro discharge; wherein P is 0 Representing a micro-discharge threshold power index of the surface micro-bulge high-power ferrite circulator to be designed;
step 36, if P 1 D ≤P 0 The distance from the center of the polygonal section of the polygonal column bulge to the side length, the center distance between two adjacent polygonal column bulges and the height of the polygonal column bulge are adjusted; wherein, the distance from the center of the polygonal section of the polygonal column bulge to the side length is selected within the range of 0.2 mm-lambda/10; repeating the steps 33-34 until the micro-discharge threshold power of the designed ferrite circulator is greater than P 0 And processing the polygonal columnar projections on the surface of the ferrite substrate based on the obtained final structural parameters of the polygonal columnar projections to obtain the ferrite of the polygonal columnar projections meeting the final structural parameters.
In the design method of the surface microprotrusion high-power ferrite circulator, lambda=2pi/f 0 ，f 0 The working frequency of the surface microprotrusion high-power ferrite circulator to be designed is shown.
In the design method of the surface microprotrusion high-power ferrite circulator, the protrusions are uniformly arranged periodically or unevenly arranged on the ferrite substrate.
In the design method of the surface microprotrusion high-power ferrite circulator, the number of the bosses is one or two, and the number of the ferrite substrates is one or two.
In the design method of the surface microprotrusion high-power ferrite circulator, when the number of ferrite substrates is two, the protrusions are arranged in a staggered manner on the ferrite substrates, namely, the protrusions on one ferrite substrate are opposite to the gaps between the protrusions on the other ferrite substrate.
In the design method of the surface microprotrusion high-power ferrite circulator, a plurality of bulges are processed on the surface of a ferrite substrate by a mechanical processing method, so that ferrite with the bulges is obtained.
The invention has the following advantages:
the invention discloses a design method of a high-power ferrite circulator with surface microprotrusions, which realizes effective suppression of secondary electron emission on the surface of a ferrite material by integrally processing the surface microprotrusions during processing of the ferrite material, and further realizes the micro-discharge suppression of the ferrite circulator by comprehensively optimizing design on the premise of ensuring the electrical performance according to the design characteristics of a junction circulator, and has the characteristics of integrally forming the ferrite material, good heat dissipation performance, vibration resistance, small loss and the like, thereby having great application prospect and application value.
Drawings
FIG. 1 is a schematic diagram of the basic structure of a dual-chip ferrite substrate circulator in an embodiment of the invention;
FIG. 2 is a schematic diagram of the basic structure of a monolithic ferrite substrate circulator in accordance with an embodiment of the invention;
FIG. 3 is a schematic diagram of a ferrite structure with hexagonal stud bumps according to an embodiment of the present invention;
FIG. 4 is a flow chart of secondary electron emission characteristic calculation according to an embodiment of the present invention;
fig. 5 is a graph of secondary electron emission yield for a ferrite with hexagonal stud bumps according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention disclosed herein will be described in further detail with reference to the accompanying drawings.
In this embodiment, the design method of the surface microprotrusion high-power ferrite circulator includes:
and step 1, processing to obtain the metal cavity with the boss.
In this embodiment, the boss is integrally formed with the metal cavity, and belongs to a part of the metal cavity. The number of the bosses is one, as shown in fig. 1; or two, as shown in fig. 2.
And 2, processing a plurality of protrusions on the surface of the ferrite substrate to obtain the ferrite with the protrusions.
In this embodiment, the number of ferrite substrates is identical to the number of bosses. A plurality of protrusions can be machined on the surface of the ferrite substrate by a machining method, and ferrite with the protrusions is obtained.
Preferably, the shape of the raised structure may be any one or more of the following: cylindrical, square, and polygonal columns; the protrusions are arranged uniformly on the ferrite substrate periodically or non-uniformly (for example, when the number of ferrite substrates is two, the protrusions may be arranged on the ferrite substrate in a staggered manner, that is, the protrusions on one ferrite substrate are opposite to the gaps between the protrusions on the other ferrite substrate). In other words, any one shape combination of a cylindrical shape, a square shape and a polygonal shape can be selected, and ferrite with protrusions meeting the requirements can be processed on the ferrite substrate in a periodical uniform arrangement mode or a non-uniform arrangement mode. The following description is made of the design method of the cylindrical, square column and polygonal column protrusion.
When the structure shape of the protrusions is cylindrical, a plurality of protrusions can be processed on the surface of the ferrite substrate by the following method, so that ferrite with the protrusions is obtained:
step 11, determining initial structural parameters of the cylindrical protrusions: determining an initial value R of the radius of the circular cross-section of the cylindrical protrusion 0 Initial value of center-to-center distance between two adjacent cylindrical protrusions
Initial value of height of cylindrical bump
Wherein R is 0 The range of the values is as follows: 0.2mm to lambda/10, lambda representing the operating wavelength lambda=2pi/f 0 ，f 0 Indicating the working frequency of the surface microprotrusion high-power ferrite circulator to be designed; the method comprises the steps of carrying out a first treatment on the surface of the />
A substep 12, processing cylindrical bulges on the surface of the ferrite substrate according to the determined initial structural parameters of the cylindrical bulges to obtain the product meeting the initial junctionFerrite with cylindrical protrusions of structural parameters
Substep 13, calculating ferrite with cylindrical protrusions by using Monte Carlo simulation method
To obtain ferrite with cylindrical protrusions>
Is used for determining the secondary electron emission characteristics of ferrite with cylindrical protrusions under the condition of vertical incidence of electrons>
Secondary electron emission yield curves of (2).
Substep 14, ferrite with cylindrical protrusions
Is determined based on ferrite with cylindrical protrusions in combination with electromagnetic particle algorithm>
Micro-discharge threshold power P of designed ferrite circulator 1 R 。
Sub-step 15, if P 1 R ＞P 0 It is determined that the design requirements are satisfied by using ferrite with cylindrical protrusions
The design of micro discharge resistance of the surface micro-bulge high-power ferrite circulator is realized. Wherein P is 0 And the micro-discharge threshold power index of the surface micro-bulge high-power ferrite circulator to be designed is represented.
Sub-step 16, if P 1 R ≤P 0 Then adjust the cylindrical protrusionThe radius of the circular section, the center distance between two adjacent cylindrical bulges and the height of the cylindrical bulges; wherein the radius of the circular section of the cylindrical bulge is selected within the range of 0.2 mm-lambda/10; repeating the steps 13-14 until the micro-discharge threshold power of the designed ferrite circulator is greater than P 0 And processing the cylindrical protrusion on the surface of the ferrite substrate based on the obtained final structural parameters of the cylindrical protrusion to obtain the ferrite with the cylindrical protrusion, which meets the final structural parameters.
When the protruding structure is square, a plurality of protrusions can be processed on the surface of the ferrite substrate by the following method to obtain ferrite with the protrusions:
step 21, determining initial structural parameters of the square column protrusions: determining an initial value L of side length of square section of square column bulge 0 Initial value of center-to-center spacing of two adjacent square stud bumps
Initial value of height of square column bulge
Wherein L is 0 The range of the values is as follows: 0.2 mm-lambda/10,/DEG C>
Step 22, processing square column protrusions on the surface of the ferrite substrate according to the determined initial structural parameters of the square column protrusions to obtain ferrite with the square column protrusions meeting the initial structural parameters
Substep 23, calculating ferrite with square column protrusions by using Monte Carlo simulation method
To obtain ferrite with square column protrusions>
Is used for determining ferrite with square column protrusions under the condition of vertical incidence of electrons>
Secondary electron emission yield curves of (2).
Substep 24, ferrite with square stud bumps
Is determined based on ferrite with square column protrusions in combination with electromagnetic particle algorithm>
Micro-discharge threshold power P of designed ferrite circulator 1 L 。
Sub-step 25, if P 1 L ＞P 0 The design requirements are met, and ferrite with square column protrusions is adopted
The design of micro discharge resistance of the surface micro-bulge high-power ferrite circulator is realized.
Sub-step 26, if P 1 L ≤P 0 The side length of the square section of the square column bulge, the center distance between two adjacent square column bulges and the height of the square column bulge are adjusted; wherein, the side length of the square section of the square column bulge is selected within the range of 0.2 mm-lambda/10; repeating the steps 23-24 until the micro-discharge threshold power of the designed ferrite circulator is greater than P 0 Obtaining final structural parameters of the square stud bump, and processing a square on the surface of the ferrite substrate based on the obtained final structural parameters of the square stud bumpAnd the column protrusions are used for obtaining the ferrite with square column protrusions, which meets the final structural parameters.
When the protruding structural shape is a polygonal column, a plurality of protrusions can be processed on the surface of the ferrite substrate by the following method to obtain ferrite with the protrusions:
step 31, determining initial structural parameters of the polygonal column bulge: determining an initial value D of the center-to-side distance of the polygonal cross section of the polygonal column protrusion 0 Initial value of center-to-center distance between adjacent two polygonal column protrusions
Initial value of height of polygonal column bulge +.>
Wherein D is 0 The range of the values is as follows: 0.2 mm-lambda/10,
step 32, processing the polygonal column protrusions on the surface of the ferrite substrate according to the determined initial structural parameters of the polygonal column protrusions to obtain the ferrite with the polygonal column protrusions meeting the initial structural parameters
Substep 33, calculating ferrite with polygonal columnar protrusions by using Monte Carlo simulation method
To obtain ferrite with polygonal column protrusions>
Is used for determining ferrite with polygonal columnar protrusions under the condition of normal incidence of electrons>
Secondary electron emission yield curves of (2).
Substep 34, ferrite with polygonal columnar projections is to be formed
Is determined based on ferrite with polygonal columnar projections in combination with electromagnetic particle algorithm>
Micro-discharge threshold power P of designed ferrite circulator 1 D 。
Sub-step 35, if P 1 D ＞P 0 Then confirm to meet the design requirement, adopt ferrite with polygonal column protrusion
The design of micro discharge resistance of the surface micro-bulge high-power ferrite circulator is realized.
Sub-step 36, if P 1 D ≤P 0 The distance from the center of the polygonal section of the polygonal column bulge to the side length, the center distance between two adjacent polygonal column bulges and the height of the polygonal column bulge are adjusted; wherein, the distance from the center of the polygonal section of the polygonal column bulge to the side length is selected within the range of 0.2 mm-lambda/10; repeating the steps 33-34 until the micro-discharge threshold power of the designed ferrite circulator is greater than P 0 And processing the polygonal columnar projections on the surface of the ferrite substrate based on the obtained final structural parameters of the polygonal columnar projections to obtain the ferrite of the polygonal columnar projections meeting the final structural parameters.
And 3, fixing ferrite with protrusions on the boss of the metal cavity.
On the basis of the above-described embodiment, the following description will be made in connection with a specific example.
The structure of the high-power ferrite circulator with the microprotrusions on the surface to be designed is as follows: the ferrite cavity comprises a metal cavity and a ferrite substrate, wherein the ferrite substrate is positioned above a boss in the metal cavity and is tightly connected with the boss. The boss belongs to a part of the metal cavity and is related to the working bandwidth and impedance matching characteristic of the ferrite circulator.
Working frequency f of surface microprotrusion high-power ferrite circulator to be designed 0 10GHz, micro-discharge threshold power index P 0 The electric performance index is that S11 is less than or equal to-10 dB, S21 is more than or equal to-0.5 dB and S31 is less than or equal to-25 dB at the working frequency.
Then there are:
(1) And constructing a bulge on the ferrite substrate to obtain the ferrite with the bulge.
The structural shape of the protrusions may be any one or more of the following shapes: cylindrical, square, and polygonal columns. For example, to enhance process availability, the raised structures may be hexagonal pillars in shape, as shown in FIG. 3.
(2) As shown in fig. 4, a secondary electron emission characteristic of ferrite having protrusions may be calculated using a monte carlo simulation method, and a secondary electron emission yield curve of ferrite having protrusions may be determined as shown in fig. 5. Wherein FIG. 5 (a) shows different hexagonal cross-section side lengths L C Secondary electron emission yield plot of ferrite with hexagonal stud bumps, FIG. 5 (b) is a graph of the secondary electron emission yield at different heights H C Secondary electron emission yield plots for ferrites with hexagonal stud bumps.
(3) According to the micro-discharge threshold power index P 0 And optimizing the structural parameters of the protrusions, and determining the final structural parameters of the protrusions. For example, for a ferrite with hexagonal stud bumps, the final structural parameters of the hexagonal stud bumps are as follows: h c 1.5mm, L c Average value D of center-to-center spacing of every two hexagonal columns of 0.5mm c 1.67mm.
(4) And determining the sizes of the boss and the ferrite substrate according to the electrical performance index of the surface microprotrusion high-power ferrite circulator to be designed, and realizing the micro discharge resistance design of the surface microprotrusion high-power ferrite circulator design method.
The micro-discharge threshold pairs of the high-power ferrite circulator with the micro-protrusions on the front surface and the rear surface are optimally designed as shown in table 1:
| device and method for manufacturing the same | Micro-discharge experimental threshold |
| Circulator (smooth surface) | 380W，400W |
| Circulator (surface micro-pore array structure) | ≥3400W，≥3400W |
TABLE 1
The electrical performance pairs of the microprotrusion high-power ferrite circulator on the front surface and the rear surface are optimally designed as shown in table 2:
| device and method for manufacturing the same | Insertion loss |
| Circulator (smooth surface) | 0.15dB |
| Circulator (surface micropore structure) | 0.15dB |
TABLE 2
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
What is not described in detail in the present specification belongs to the known technology of those skilled in the art.
Claims (10)
1. The design method of the surface microprotrusion high-power ferrite circulator is characterized by comprising the following steps of:
processing to obtain a metal cavity with a boss;
processing a plurality of bulges on the surface of a ferrite substrate to obtain ferrite with bulges;
ferrite with protrusions is fixed on the boss of the metal cavity.
2. The method for designing a surface microprotrusion high power ferrite circulator of claim 1, wherein the structural shape of the embossment is any one or more of the following shapes: cylindrical, square, and polygonal columns.
3. The design method of the surface microprotrusion high power ferrite circulator of claim 2, wherein when the structural shape of the protrusions is cylindrical, a plurality of protrusions are processed on the surface of the ferrite substrate by the following method to obtain ferrite with the protrusions:
step 11, determining initial structural parameters of the cylindrical protrusions: determining an initial value R of the radius of the circular cross-section of the cylindrical protrusion 0 Initial value W of center-to-center spacing of two adjacent cylindrical protrusions 0 R Initial value H of height of cylindrical boss 0 R The method comprises the steps of carrying out a first treatment on the surface of the Wherein R is 0 The range of the values is as follows: 0.2 mm-lambda/10, lambda representing the operating wavelength; w (W) 0 R -R 0 ＝0.2mm；H 0 R ＝0.1mm；
Step 12, processing cylindrical bulges on the surface of the ferrite substrate according to the determined initial structural parameters of the cylindrical bulges to obtain ferrite A with the cylindrical bulges, wherein the ferrite A meets the initial structural parameters 0 R ；
Step 13, calculating ferrite A with cylindrical protrusions by adopting Monte Carlo simulation method 0 R And randomly moving to obtain ferrite A with cylindrical protrusions 0 R Is used for determining the secondary electron emission characteristics of ferrite A with cylindrical protrusions under the condition of normal incidence of electrons 0 R Secondary electron emission yield curves of (2);
step 14, ferrite A with cylindrical protrusion 0 R Is determined based on ferrite a with cylindrical protrusions in combination with an electromagnetic particle algorithm 0 R Micro-discharge threshold power P of designed ferrite circulator 1 R ；
Step 15, if P 1 R ＞P 0 Then confirm to meet the design requirement, adopt ferrite A with cylindrical protrusion 0 R The design of micro discharge resistance of the surface micro-bulge high-power ferrite circulator is realized; wherein P is 0 Representing a micro-discharge threshold power index of the surface micro-bulge high-power ferrite circulator to be designed;
step 16, if P 1 R ≤P 0 The radius of the circular section of the cylindrical bulge, the center distance between two adjacent cylindrical bulges and the height of the cylindrical bulge are adjusted; wherein the radius of the circular section of the cylindrical bulge is selected within the range of 0.2 mm-lambda/10; repeating the steps 13-14 until the micro-discharge threshold power of the designed ferrite circulator is greater than P 0 Obtaining the final structural parameters of the cylindrical protrusions, and processing the cylindrical protrusions on the surface of the ferrite substrate based on the obtained final structural parameters of the cylindrical protrusions to obtain the final productFerrite with cylindrical protrusions of structural parameters.
4. The design method of the surface microprotrusion high power ferrite circulator of claim 2, wherein when the structural shape of the protrusions is square columns, a plurality of protrusions are processed on the surface of the ferrite substrate by the following method to obtain ferrite with the protrusions:
step 21, determining initial structural parameters of the square column protrusions: determining an initial value L of side length of square section of square column bulge 0 Initial value W of center distance of two adjacent square column bulges 0 L Initial value H of height of square column bulge 0 L The method comprises the steps of carrying out a first treatment on the surface of the Wherein L is 0 The range of the values is as follows: 0.2 mm-lambda/10, lambda representing the operating wavelength; w (W) 0 L -L 0 ＝0.2mm；H 0 L ＝0.1mm；
Step 22, processing square column protrusions on the surface of the ferrite substrate according to the determined initial structural parameters of the square column protrusions to obtain ferrite A with the square column protrusions, wherein the ferrite A meets the initial structural parameters 0 L ；
Step 23, calculating ferrite A with square column protrusions by adopting Monte Carlo simulation method 0 L Randomly moves to obtain ferrite A with square column protrusions 0 L Is used for determining the secondary electron emission characteristics of ferrite A with square column protrusions under the condition of vertical incidence of electrons 0 L Secondary electron emission yield curves of (2);
step 24, ferrite A with square column protrusions 0 L Is determined based on ferrite A with square column protrusions by combining secondary electron emission yield curve with electromagnetic particle algorithm 0 L Micro-discharge threshold power P of designed ferrite circulator 1 L ；
Step 25, if P 1 L ＞P 0 Then confirm to meet the design requirement, adopt ferrite A with square column protrusion 0 L Realize high-power ferrite with micro-protrusions on surfaceA circulator is designed to resist micro discharge; wherein P is 0 Representing a micro-discharge threshold power index of the surface micro-bulge high-power ferrite circulator to be designed;
step 26, if P 1 L ≤P 0 The side length of the square section of the square column bulge, the center distance between two adjacent square column bulges and the height of the square column bulge are adjusted; wherein, the side length of the square section of the square column bulge is selected within the range of 0.2 mm-lambda/10; repeating the steps 23-24 until the micro-discharge threshold power of the designed ferrite circulator is greater than P 0 And processing the square column protrusions on the surface of the ferrite substrate based on the obtained final structural parameters of the square column protrusions to obtain ferrite with the square column protrusions, wherein the ferrite meets the final structural parameters.
5. The design method of the surface microprotrusion high power ferrite circulator of claim 2, wherein when the structural shape of the protrusions is polygonal column, a plurality of protrusions are processed on the surface of the ferrite substrate by the following method to obtain ferrite with the protrusions:
step 31, determining initial structural parameters of the polygonal column bulge: determining an initial value D of the center-to-side distance of the polygonal cross section of the polygonal column protrusion 0 Initial value W of center-to-center spacing of adjacent two polygonal column protrusions 0 D Initial value H of height of polygonal column bulge 0 D The method comprises the steps of carrying out a first treatment on the surface of the Wherein D is 0 The range of the values is as follows: 0.2 mm-lambda/10, lambda representing the operating wavelength; w (W) 0 D -D 0 ＝0.2mm；H 0 D ＝0.1mm；
Step 32, processing the polygonal column protrusions on the surface of the ferrite substrate according to the determined initial structural parameters of the polygonal column protrusions to obtain ferrite A with the polygonal column protrusions meeting the initial structural parameters 0 D ；
Step 33, calculating ferrite A with polygonal column protrusions by using Monte Carlo simulation method 0 D Is randomly moved to obtainTo ferrite A with polygonal columnar projections 0 D Defining ferrite A having polygonal columnar projections at normal incidence of electrons 0 D Secondary electron emission yield curves of (2);
step 34, ferrite A with polygonal columnar protrusions 0 D Is based on ferrite a with polygonal columnar projections, determined by combining secondary electron emission yield curves with electromagnetic particle algorithm 0 D Micro-discharge threshold power P of designed ferrite circulator 1 D ；
Step 35, if P 1 D ＞P 0 Then confirm to meet the design requirement, adopt ferrite A with polygonal column protrusion 0 D The design of micro discharge resistance of the surface micro-bulge high-power ferrite circulator is realized; wherein P is 0 Representing a micro-discharge threshold power index of the surface micro-bulge high-power ferrite circulator to be designed;
step 36, if P 1 D ≤P 0 The distance from the center of the polygonal section of the polygonal column bulge to the side length, the center distance between two adjacent polygonal column bulges and the height of the polygonal column bulge are adjusted; wherein, the distance from the center of the polygonal section of the polygonal column bulge to the side length is selected within the range of 0.2 mm-lambda/10; repeating the steps 33-34 until the micro-discharge threshold power of the designed ferrite circulator is greater than P 0 And processing the polygonal columnar projections on the surface of the ferrite substrate based on the obtained final structural parameters of the polygonal columnar projections to obtain the ferrite of the polygonal columnar projections meeting the final structural parameters.
6. The method for designing a surface microprotrusion high power ferrite circulator of claim 3, 4 or 5, wherein λ=2pi f 0 ，f 0 The working frequency of the surface microprotrusion high-power ferrite circulator to be designed is shown.
7. The method of designing a surface microprotrusion high power ferrite circulator of claim 1, wherein the protrusions are arranged uniformly periodically or non-uniformly on the ferrite substrate.
8. The method of designing a surface microprotrusion high power ferrite circulator of claim 1, wherein the number of bosses is one or two and the number of ferrite substrates is one or two.
9. The method of designing a surface microprotrusion high power ferrite circulator of claim 8, wherein when the number of ferrite substrates is two, the protrusions are arranged in a staggered manner on the ferrite substrates, i.e., the protrusions on one ferrite substrate are opposed to the gaps between the protrusions on the other ferrite substrate.
10. The design method of the surface microprotrusion high power ferrite circulator of claim 1, wherein a plurality of protrusions are machined on the surface of the ferrite substrate by a machining method to obtain the ferrite with the protrusions.
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