CN113328224B - Microstrip circulator with shielding structure - Google Patents
Microstrip circulator with shielding structure Download PDFInfo
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- CN113328224B CN113328224B CN202110878194.5A CN202110878194A CN113328224B CN 113328224 B CN113328224 B CN 113328224B CN 202110878194 A CN202110878194 A CN 202110878194A CN 113328224 B CN113328224 B CN 113328224B
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- permanent magnet
- shielding
- shielding cover
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/32—Non-reciprocal transmission devices
- H01P1/38—Circulators
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Abstract
The invention discloses a microstrip circulator with a shielding structure, which belongs to the technical field of microwave components and parts and comprises a permanent magnet, a ceramic plate, a ferrite and a bottom plate from top to bottom, wherein a medium plate is arranged above the permanent magnet, a shielding cover is arranged above the medium plate, the inner diameter of the shielding cover is larger than the outer diameters of the medium plate, the permanent magnet and the ceramic plate, the inner diameter of the shielding cover is smaller than the outer diameter of the ferrite, and the bottom end of the shielding cover is not more than the bottom end of the permanent magnet; the microstrip circulator disclosed by the invention can compensate the change of the magnetic field intensity under the temperature change due to the adoption of a new semi-shielding structure, so that the product has better temperature stability.
Description
Technical Field
The invention relates to the technical field of microwave components, in particular to a microstrip circulator with a shielding structure.
Background
A typical microstrip ferrite structure is shown in fig. 1, and includes a permanent magnet 1, a ceramic plate 2, a ferrite 3, and a bottom plate 4 (generally an iron bottom plate) from top to bottom; in order to shield the influence of the upper cover plate of the microwave assembly on the magnetic field (the cavity effect and the influence of the wave-absorbing material), a shielding structure is generally required to be arranged.
At present, there are two common shielding structures: one is a shielding structure based on a side guide die, as shown in fig. 2, the shielding shell extends from the metal bottom plate to the upper side of the permanent magnet from the side, and is a U-shaped shielding shell 5, and a gasket 6 is arranged between the permanent magnet 1 and the U-shaped shielding shell 5, as shown in fig. 3. The other is a microstrip spacer ring assembly full shielding structure, as shown in fig. 4, the shielding structure is composed of an upper shield 7 and a lower shield 8, as shown in fig. 5, a compensation sheet 9 and the like are arranged between the upper shield 7 and the permanent magnet 1.
However, the two existing shielding structures do not have any influence on the magnetic field intensity change at different temperatures, that is, the magnetic field change caused by the temperature change cannot be compensated, which is not favorable for the temperature stability of the circulator. In the prior art, compensation plates are generally provided, which are made of round or square iron or nickel alloy, but are positioned above or below a magnetic field, and the effect of the compensation plates is to increase or reduce the magnetic field, and the compensation effect of the magnetic field on temperature change is not involved.
Disclosure of Invention
The invention aims to provide a microstrip circulator with a shielding structure to solve the problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a microstrip circulator with shielding structure, includes permanent magnet, potsherd, ferrite and bottom plate from top to bottom the permanent magnet top sets up the medium piece the top of medium piece sets up the shielding lid, the shielding lid internal diameter is greater than the external diameter of medium piece, permanent magnet and potsherd, the shielding lid internal diameter is less than the external diameter of ferrite, the bottom of shielding lid is no longer than the bottom of permanent magnet, and the shielding lid only shelters from the partly rather than sheltering from completely of permanent magnet promptly, and above-mentioned structure can improve the temperature stability of microstrip circulator.
The dielectric sheet in the above structure is generally made of a ceramic material or a material with low magnetic permeability such as polytetrafluoroethylene, belongs to one of shielding structural components, and has the function of shielding signals, and the dielectric sheet is only a compensation sheet without the shielding cover and has no shielding function, so that the dielectric sheet needs to be arranged, and the independent dielectric sheet does not have the function of compensating and shunting the magnetic field.
As a preferred technical scheme: the bottom plate is connected with the ferrite in a welding mode, and the ferrite is connected with the ceramic plate, the ceramic plate is connected with the permanent magnet, the permanent magnet is connected with the medium plate, and the medium plate is connected with the shielding cover in an adhesion mode.
As a preferred technical scheme: the inner diameter of the shielding cover is 0.2mm-0.5mm larger than the outer diameter of the permanent magnet.
As a preferred technical scheme: the inner diameter of the shielding cover is smaller than the outer diameter of the ferrite by 0.1mm-0.5 mm.
As a preferred technical scheme: the height of the interior of the shielding cover is 0.2mm-0.5mm greater than the height of the medium sheet, but the bottom end of the shielding cover does not exceed the bottom end of the permanent magnet.
The inner diameter of the shielding cover is too small, which is not beneficial to the bonding process; the shielding cover has an overlarge inner diameter, cannot effectively restrain a magnetic field and cannot achieve the purpose of shunting the magnetic field at different temperatures, and becomes a common compensation sheet; the height of the interior of the shielding cover does not exceed the height of the medium, so that the aim of shunting the magnetic field at different temperatures cannot be fulfilled, and the shielding cover can also become a common compensation sheet; the bottom end of the shielding cover exceeds the bottom end of the permanent magnet, so that the change of the magnetic field is too large, and the electrical property of the product is poor.
As a preferred technical scheme: the shielding cover is made of iron or nickel materials.
The shielding cover semi-covers the permanent magnet, and the structure can effectively compensate the magnetic field change of the permanent magnet caused by temperature change: when the temperature rises, the magnetic field intensity of the permanent magnet of the device is weakened, but the magnetic conductivity of the shielding cover is reduced, the structure of the shielding cover of the invention enables the side surface to be reduced through the magnetic field, namely the ineffective magnetic field is reduced, thereby restricting the effective magnetic field to increase, slowing down the weakening of the magnetic field intensity at high temperature, and the shielding structure plays a role in shunting; when the temperature reduces, the permanent magnet magnetic field intensity of device becomes strong, but the magnetic permeability grow of shield cover, and the structure of shield cover makes the side pass through the magnetic field grow, and the null magnetic field increases promptly, and the effective magnetic field reduces, slows down the magnetic field intensity grow under the low temperature, finally reaches the purpose in compensation magnetic field under the different temperatures for the product has better temperature stability.
Compared with the prior art, the invention has the advantages that: the micro-strip circulator adopts a new semi-shielding structure, and can compensate the change of the magnetic field intensity under the temperature change through the shunting action, so that the product has better temperature stability.
Drawings
FIG. 1 is a schematic diagram of a typical microstrip circulator;
FIG. 2 is a schematic diagram of a microstrip circulator with a shielding structure based on an edge guided mode in the prior art;
fig. 3 is a schematic structural view of the shield case of fig. 2;
FIG. 4 is a schematic diagram of a microstrip circulator with a fully shielded structure according to the prior art;
FIG. 5 is a schematic view of the upper and lower shields of FIG. 4;
FIG. 6 is a schematic structural diagram of a microstrip circulator in patent embodiment 1 of the present invention;
FIG. 7 is an electrical property simulation diagram of the microstrip circulator of example 1 at room temperature;
FIG. 8 is an electrical property simulation diagram of the microstrip circulator of comparative example 1 at normal temperature;
FIG. 9 is a graph showing the electrical performance simulation of the microstrip circulator of example 1 at 85 ℃;
FIG. 10 is an electrical performance simulation of the microstrip circulator of comparative example 1 at 85 deg.C;
FIG. 11 is a graph showing the electrical performance simulation of the microstrip circulator of example 1 at-55 ℃;
fig. 12 is a simulation graph of the electrical performance of the microstrip circulator of comparative example 1 at-55 ℃.
In the figure: 1. a permanent magnet; 2. a ceramic plate; 3. a ferrite; 4. a base plate; 5. a U-shaped shielding shell; 6. a gasket; 7. an upper shield; 8. lower shielding; 9. a compensation plate; 10. a dielectric sheet; 11. and a shielding cover.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 6, a microstrip circulator with a shielding structure includes a permanent magnet 1, a ceramic plate 2, a ferrite 3 and a bottom plate 4 from top to bottom, wherein a dielectric plate 10 is arranged above the permanent magnet 1, the outer diameters of the permanent magnet 1, the ceramic plate 2 and the dielectric plate 10 are the same, a shielding cover 11 is arranged above the dielectric plate 10, the inner diameter of the shielding cover 11 is greater than the outer diameter of the permanent magnet 1 by 0.3mm, the inner diameter of the shielding cover 11 is less than the outer diameter of the ferrite 3 by 0.3mm, the inner height of the shielding cover 11 is greater than the height of the dielectric plate 9 by 0.5mm, and the height of the shielding cover 11 is not more than the bottom end of the permanent magnet 1, that is, the shielding cover 10 covers a part of the permanent magnet 1;
in this embodiment, the shielding cover 11 is made of an iron material; the bottom plate 4 is connected with the ferrite 3 in a welding mode, and the ferrite 3 is connected with the ceramic plate 2, the ceramic plate 2 is connected with the permanent magnet 1, the permanent magnet 1 is connected with the medium sheet 10, and the medium sheet 10 is connected with the shielding cover 11 in an adhesion mode;
the circulator having the above-described structure is "embodiment 1".
Comparative example 1
In comparison with example 1, the comparative circulator is "comparative example 1", in which the dielectric sheet 10 and the shield cover 11 are not provided, but the edge guide mode-based shield structure as shown in fig. 2 is mentioned in the background art.
And (3) performance testing:
1. and (3) simulating the electrical performance of the microstrip circulator at normal temperature:
the performance of the circulators of the aforementioned "example 1" and "comparative example 1" was simulated at normal temperature (25 ℃), and the results are shown in fig. 7 and 8,
as can be seen from the comparison between fig. 7 and fig. 8, the electrical performance of the microstrip circulator of comparative example 1 at normal temperature is not much different from that of the half-shielded microstrip circulator of example 1.
2. And (3) simulating the electrical property of the microstrip circulator at high temperature (85 ℃):
electrical property simulations were performed at 85 c for the aforementioned circulators of "example 1" and "comparative example 1", and the results are shown in fig. 9 and 10,
as can be seen from a comparison of fig. 9 and fig. 10, the high-frequency electrical performance (11.8 GHz) of the microstrip circulator of comparative example 1 is deteriorated (compared with fig. 8) at high temperature (85 ℃), because the magnetic field strength of the permanent magnet of the device is weakened at high temperature, which results in the deterioration of the high-frequency electrical performance and the improvement of the low-frequency electrical performance; the high-frequency electrical performance (11.8 GHz) of the semi-shielded microstrip circulator of example 1 is also deteriorated (compared with fig. 7), but not as much as that of the microstrip circulator of comparative example 1;
the structure of the shielding cover can be proved to be capable of properly enhancing the magnetic field intensity at high temperature and slowing down the weakening of the magnetic field intensity at high temperature.
3. And (3) simulating the electrical property of the micro-strip circulator at low temperature (-55 ℃):
electrical performance simulations were performed at-55 c for the aforementioned circulators of "example 1" and "comparative example 1", and the results are shown in figures 11 and 12,
as can be seen from the comparison of fig. 11 and fig. 12, the low-frequency electrical performance (7.8 GHz) of the microstrip circulator of comparative example 1 is deteriorated at low temperature (-55 ℃) (compared with fig. 8), because the magnetic field strength of the permanent magnet of the device becomes stronger at low temperature, resulting in the deterioration of the low-frequency electrical performance and the improvement of the high-frequency electrical performance; the low-frequency electrical performance (7.8 GHz) of the semi-shielded microstrip circulator of example 1 is also degraded (compare with fig. 7), but not as much as that of a general microstrip circulator;
the structure of the shielding cover can be used for properly weakening the magnetic field strength at low temperature and slowing down the magnetic field strength strengthening at low temperature.
The simulation indexes of the edge frequency electrical property of different structures at different temperatures are shown in table 1:
TABLE 1 simulation index of edge frequency electrical performance of different structures at different temperatures
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a microstrip circulator with shielding structure, includes permanent magnet, potsherd, ferrite and bottom plate from top to bottom, its characterized in that: the micro-strip circulator comprises a permanent magnet, a shielding cover, a medium sheet, a ferrite, a micro-strip circulator and a micro-strip circulator, and is characterized in that the medium sheet is arranged above the permanent magnet, the shielding cover is arranged above the medium sheet, the inner diameter of the shielding cover is larger than the outer diameters of the medium sheet, the permanent magnet and the ceramic sheet, the inner diameter of the shielding cover is smaller than the outer diameter of the ferrite, the bottom end of the shielding cover is not more than the bottom end of the permanent magnet, and the temperature stability of the micro-strip circulator can be improved by the structure.
2. The microstrip circulator with a shielding structure of claim 1, wherein: the bottom plate is connected with the ferrite in a welding mode, and the ferrite is connected with the ceramic plate, the ceramic plate is connected with the permanent magnet, the permanent magnet is connected with the medium plate, and the medium plate is connected with the shielding cover in an adhesion mode.
3. The microstrip circulator with a shielding structure of claim 1, wherein: the inner diameter of the shielding cover is 0.2mm-0.5mm larger than the outer diameter of the permanent magnet.
4. The microstrip circulator with a shielding structure of claim 1, wherein: the inner diameter of the shielding cover is smaller than the outer diameter of the ferrite by 0.1mm-0.5 mm.
5. The microstrip circulator with a shielding structure of claim 1, wherein: the height of the interior of the shielding cover is 0.2mm-0.5mm greater than the height of the medium sheet.
6. The microstrip circulator with a shielding structure of claim 1, wherein: the shielding cover is made of iron or nickel materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110878194.5A CN113328224B (en) | 2021-08-02 | 2021-08-02 | Microstrip circulator with shielding structure |
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| CN202110878194.5A CN113328224B (en) | 2021-08-02 | 2021-08-02 | Microstrip circulator with shielding structure |
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| CN113328224A CN113328224A (en) | 2021-08-31 |
| CN113328224B true CN113328224B (en) | 2021-10-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103647126A (en) * | 2013-12-18 | 2014-03-19 | 成都致力微波科技有限公司 | Two-junction microstrip circulator with magnetic shielding case and assembly formed by same |
| CN103647125A (en) * | 2013-12-18 | 2014-03-19 | 成都致力微波科技有限公司 | Unijunction microstrip circulator or microstrip isolator with magnetic shielding case |
| CN203721864U (en) * | 2013-12-18 | 2014-07-16 | 成都致力微波科技有限公司 | Single-junction microstrip isolator with magnetic shield |
| CN104167584A (en) * | 2014-08-13 | 2014-11-26 | 杭州电子科技大学 | Thin film circulator integrating micro-strip and manufacturing method thereof |
| CN112838344A (en) * | 2020-12-31 | 2021-05-25 | 广东大普通信技术有限公司 | Circular device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100231703B1 (en) * | 1997-09-12 | 1999-12-01 | 이계철 | Isolator/circulator with propeller shaped resonator |
| KR100269588B1 (en) * | 1997-12-30 | 2000-10-16 | 김덕용 | Microwave circulator |
| JP3173596B2 (en) * | 1998-10-23 | 2001-06-04 | 日本電気株式会社 | Microwave / millimeter wave circuit device |
| JP5137125B2 (en) * | 2008-06-02 | 2013-02-06 | 国立大学法人山口大学 | Nonreciprocal circuit element that can be integrated |
| US10096879B2 (en) * | 2016-03-07 | 2018-10-09 | Raytheon Company | Shaped magnetic bias circulator |
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2021
- 2021-08-02 CN CN202110878194.5A patent/CN113328224B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647126A (en) * | 2013-12-18 | 2014-03-19 | 成都致力微波科技有限公司 | Two-junction microstrip circulator with magnetic shielding case and assembly formed by same |
| CN103647125A (en) * | 2013-12-18 | 2014-03-19 | 成都致力微波科技有限公司 | Unijunction microstrip circulator or microstrip isolator with magnetic shielding case |
| CN203721864U (en) * | 2013-12-18 | 2014-07-16 | 成都致力微波科技有限公司 | Single-junction microstrip isolator with magnetic shield |
| CN104167584A (en) * | 2014-08-13 | 2014-11-26 | 杭州电子科技大学 | Thin film circulator integrating micro-strip and manufacturing method thereof |
| CN112838344A (en) * | 2020-12-31 | 2021-05-25 | 广东大普通信技术有限公司 | Circular device |
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