CN211320283U - Composite ferrite ultra-wideband circulator - Google Patents
Composite ferrite ultra-wideband circulator Download PDFInfo
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- CN211320283U CN211320283U CN201922104523.1U CN201922104523U CN211320283U CN 211320283 U CN211320283 U CN 211320283U CN 201922104523 U CN201922104523 U CN 201922104523U CN 211320283 U CN211320283 U CN 211320283U
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Abstract
The utility model discloses a make portably, compound ferrite ultra wide band circulator that stability is strong, including high magnetic conductivity sheetmetal, high saturation magnetization ferrite, three low saturation magnetization ferrite, and three matching circuit medium that is connected with it, high saturation magnetization ferrite sets up in high magnetic conductivity sheetmetal middle part, all low saturation magnetization ferrites and matching circuit medium that are connected are arranged around high saturation magnetization ferrite circumference, high saturation magnetization ferrite, low saturation magnetization ferrite, be equipped with microstrip circuit or belted line circuit on the matching circuit medium, one side of keeping away from high magnetic conductivity sheetmetal on the high saturation magnetization ferrite is equipped with outer biasing steady magnetic field source, be equipped with three straight cutting edge on the high saturation magnetization ferrite, and each other becomes 120 degrees; the ferrite with low saturation magnetization is provided with two straight cutting edges; the matching circuit medium is provided with a straight cut edge.
Description
Technical Field
The invention belongs to the field of microwave devices, relates to a nonreciprocal microwave device, and particularly relates to a composite ferrite ultra-wideband circulator.
Background
The electromagnetic suppression, electromagnetic interference and anti-interference functions in modern battlefields are increasingly prominent, corresponding electronic equipment is required to have ultra-bandwidth and high-power performance, and a ferrite-based microstrip/strip line circulator/isolator becomes a preferred component of the modern electronic equipment due to good insertion loss performance, high-power performance and high-bandwidth performance.
At present, large bandwidth ferrite circulators with relative bandwidth less than 70% (upper frequency minus lower frequency divided by center frequency) are commonly implemented by using a single ferrite material based on wave impedance and coupling angle continuous tracking (continuous tracking) technology. For an ultra-bandwidth ferrite circulator with a relative bandwidth of more than 80%, the ultra-bandwidth can not be realized by using a single ferrite material, and the current solution is based on the perimeter mode theory and adopts a cylinder-ring composite ferrite nested structure with gradient of saturation magnetization from the center to the periphery, namely, a ferrite cylinder with high saturation magnetization is nested in the center, a ferrite ring with low saturation magnetization is nested in the periphery of the ferrite cylinder, a medium is nested outside the ring, and an electromagnetic field forms a perimeter mode on the interface of the ferrite cylinder and the ring, and the construction schematic diagram is shown in fig. 1 (for the sake of intuition, conductors and permanent magnets are omitted in the schematic diagram).
Although the circulator/isolator with the cylindrical-circular ring composite ferrite structure can well realize super bandwidth, the electrical property is very sensitive to gaps among nested structures, so that the requirement on the precision of the nested structures is very high, the processing and manufacturing difficulty is very high, the consistency and stability of products are difficult to ensure during batch production, and the production efficiency is very low. Meanwhile, as the medium with holes and the ferrite ring are generally punched by laser, the hole wall punched by the laser has inherent taper, the thicker the substrate is, the more remarkable the taper is, and in addition, the ferrite material is very brittle, so that great difficulty is brought to the assembly of a later-stage nested structure, the edge of the ferrite cylinder/ring can be broken by carelessness, and the electrical property is further deteriorated. Meanwhile, laser drilling is very costly and has limited precision (the diameter tolerance is difficult to be within 30 micrometers and sometimes the roundness is poor), and these factors cause that the efficiency is very low in batch production on one hand and the consistency and stability of products are poor on the other hand.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the composite ferrite ultra-wideband circulator is simple and convenient to manufacture and high in stability.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a composite ferrite ultra-wideband circulator comprises a high-permeability metal sheet as a splicing carrier plate, high-saturation magnetization ferrite, three low-saturation magnetization ferrites and matching circuit media which are equal to the low-saturation magnetization ferrite in number and are connected with the low-saturation magnetization ferrite, wherein the high-saturation magnetization ferrite is arranged in the middle of the high-permeability metal sheet, all the connected low-saturation magnetization ferrite and matching circuit media are circumferentially arranged around the high-saturation magnetization ferrite, a micro-strip circuit or a strip-line circuit is arranged on the high-saturation magnetization ferrite, one side, far away from the high-permeability metal sheet, of the high-saturation magnetization ferrite is provided with an external bias constant magnetic field source, and the high-saturation magnetization ferrite is provided with three flat cutting edges for seamless splicing with the low-saturation magnetization ferrite, and are mutually at an angle of 120 degrees; the low saturation magnetization ferrite is provided with two straight cutting edges which are respectively used for being seamlessly spliced with the high saturation magnetization ferrite and the matching circuit medium; the matching circuit medium is provided with a straight cutting edge butted with the ferrite with low saturation magnetization; when the high saturation magnetization ferrite, the low saturation magnetization ferrite and the matching circuit medium are provided with micro-strip circuits, the adjacent micro-strip circuits are mutually lapped by adopting metal lapping objects (the metal lapping objects can be bonding gold wires, gold-plated copper wires, wide gold belts, gold-plated copper foils, conductive pastes, conductive adhesives and the like).
As a preferable mode, the above-mentionedThe value of the saturation magnetization of the ferrite having a high saturation magnetization is fUpper sidebandP, unit: gauss; f. ofUpper sidebandThe frequency is the upper frequency of the ultra-wideband, the unit MHz is adopted, and the P value is 6.5-4.5.
Preferably, the value of the saturation magnetization of the ferrite with low saturation magnetization is fLower sideband frequencyThe unit,/P': gauss; f. ofLower sideband frequencyThe lower frequency of the ultra-wideband is set, the unit MHz is set, and the value P' is 3-4.
Preferably, the surface of the high-permeability metal sheet is provided with a metal coating. On the one hand, to prevent rusting and, on the other hand, also for welding or gluing needs.
Preferably, the metal plating layer is a nickel or gold plating layer.
As a preferable scheme, the external bias steady magnetic field comprises a first permanent magnet and a second permanent magnet which are arranged on the ferrite with high saturation magnetization from bottom to top, wherein the size of the contact surface of the first permanent magnet and the second permanent magnet is smaller than that of the second permanent magnet.
Preferably, an insulating pad is arranged between the first permanent magnet and the ferrite with high saturation magnetization.
The invention has the beneficial effects that:
in the scheme, the ferrite with high and low saturation magnetization and the peripheral matching circuit medium can be cut by a dicing saw and then seamlessly spliced, due to the inherent high precision and cutting surface flatness of the dicing saw, seamless splicing can be easily realized between the ferrite with high and low saturation magnetization and between the ferrite and the matching circuit medium, a splicing gap can be easily realized to be less than 10 micrometers, even basically seamless, and the consistency and stability of product performance in batch production are effectively ensured. In addition, each component of the splicing structure can be cut by a dicing saw, the precision is higher than that of a cylinder-ring nesting structure, each component is simple to manufacture and easy to assemble, edge breakage of the edge of the ferrite cannot be caused easily like the cylinder-ring nesting structure during assembly, and the finished product rate of products is effectively guaranteed.
Drawings
Fig. 1 is a schematic diagram of a cylinder-ring composite ferrite nesting structure.
Figure 2 is a schematic diagram of a portion of a microstrip type composite ferrite ultra-wideband circulator circuit,
fig. 3 is a schematic diagram of an external bias steady magnetic field source structure of the microstrip type composite ferrite ultra-wideband circulator.
Fig. 4 is a schematic diagram of a process for manufacturing the microstrip type composite ferrite ultra-wideband circulator circuit of embodiment 1.
Figure 5 is a schematic diagram of a portion of a microstrip type composite ferrite ultra-wideband circulator circuit,
in fig. 1 to 5: 1. the ferrite with high saturation magnetization, 2 parts of ferrite with low saturation magnetization, 3 parts of matching circuit medium, 4 parts of microstrip circuit, 5 parts of high-permeability metal sheet, 6 parts of metal lap joint, 7 parts of external bias steady magnetic field source, 71 parts of first permanent magnet, 72 parts of second permanent magnet and 8 parts of insulating pad.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The surface of the metal sheet 5 with high magnetic conductivity is provided with a metal coating. A ferrite 1 with high saturation magnetization is arranged in the middle of the metal sheet 5 with high magnetic permeability, the ferrite 1 with high saturation magnetization has a value fUpper sidebandP, unit: gauss; f. ofUpper sidebandThe frequency is the upper frequency of the ultra-wideband, the unit MHz is adopted, and the P value is 6.5-4.5. In this example fUpper sidebandIf 13000(MHz) is used for (MHz) and the P value is 5.2, 2500(Gauss) is used for the saturation magnetization of the ferrite 1 with high saturation magnetization. The P value becomes small. Although the frequency band is widened, the low frequencyThe segment S parameters will deteriorate; the P value becomes higher and the low band S parameter becomes better, but the bandwidth of the band becomes narrower. The selection of the P value requires a compromise between bandwidth and S parameter.
The value of the saturation magnetization of the ferrite 2 having low saturation magnetization is fLower sideband frequencyThe unit,/P': gauss; f. ofLower sideband frequencyThe lower frequency of the ultra-wideband is set, the unit MHz is set, and the value P' is 3-4. In this example fLower sideband frequencyWhen the value of (MHz) is 5000 MHz and the value of P' is 3.57, the saturation magnetization of the ferrite 2 having a low saturation magnetization is 1400 (Gauss). The P' value becomes lower, and the low frequency moves to the high frequency, so that the bandwidth becomes narrower; the P' value becomes high, and the high frequency is shifted to the low frequency, so that the bandwidth becomes wide, but the S parameter is deteriorated. The choice of the P' value requires a compromise between bandwidth and S parameters. All the connected low saturation magnetization ferrite 2 and the matching circuit medium 3 are arranged circumferentially around the high saturation magnetization ferrite 1.
The high saturation magnetization ferrite 1, the low saturation magnetization ferrite 2 and the matching circuit medium 3 are provided with a micro-strip circuit 4, and one side of the high saturation magnetization ferrite 1 far away from the high magnetic conductivity metal sheet 5 is provided with an external bias steady magnetic field source 7. Three straight cutting edges for seamless splicing with the ferrite 2 with low saturation magnetization are arranged on the ferrite 1 with high saturation magnetization, and the straight cutting edges form an angle of 120 degrees with each other; the low saturation magnetization ferrite 2 is provided with two straight cutting edges which are respectively used for being seamlessly spliced with the high saturation magnetization ferrite 1 and the matching circuit medium 3; the matching circuit medium 3 is provided with a straight cutting edge butted with the ferrite 2 with low saturation magnetization; the adjacent microstrip circuits 4 are lapped with each other by adopting metal lapping objects 6 (gold wires with the diameter of 25 microns).
The external bias steady magnetic field comprises a first permanent magnet 71 (made of samarium cobalt) and a second permanent magnet 72 (made of samarium cobalt) which are arranged on the ferrite 1 with high saturation magnetization from bottom to top, wherein the size of the contact surface of the first permanent magnet 71 and the second permanent magnet 72 is smaller than that of the second permanent magnet 72 (so that the central part of the external bias steady magnetic field is thicker, the magnetic field is larger, the peripheral part of the external bias steady magnetic field is thinner, and the magnetic field is weaker). An insulating pad 8 is arranged between the first permanent magnet 71 and the ferrite 1 with high saturation magnetization.
The following table is a partial structure and performance parameter for example 1:
example 2, as shown in fig. 3, the difference from example 1 is: the matching circuit medium 3 has a rectangular shape and two trapezoidal shapes.
The above-mentioned embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be used, not restrictive; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.
Claims (7)
1. A composite ferrite ultra-wideband circulator is characterized in that: the high-saturation magnetization ferrite is arranged in the middle of the high-permeability metal sheet, all the connected low-saturation magnetization ferrites and matching circuit media are circumferentially arranged around the high-saturation magnetization ferrite, the low-saturation magnetization ferrite and the matching circuit media are provided with micro-strip circuits or strip-line circuits, one side of the high-saturation magnetization ferrite, which is far away from the high-permeability metal sheet, is provided with an external bias steady magnetic field source, and the high-saturation magnetization ferrite is provided with three straight cutting edges for seamless splicing with the low-saturation magnetization ferrite, and are mutually at an angle of 120 degrees; the low saturation magnetization ferrite is provided with two straight cutting edges which are respectively used for being seamlessly spliced with the high saturation magnetization ferrite and the matching circuit medium; the matching circuit medium is provided with a straight cutting edge butted with the ferrite with low saturation magnetization; when the high saturation magnetization ferrite, the low saturation magnetization ferrite and the matching circuit medium are provided with the micro-strip circuits, the adjacent micro-strip circuits are mutually lapped by adopting metal lapping objects.
2. The composite ferrite ultra-wideband circulator of claim 1, wherein: the value of the saturation magnetization of the high saturation magnetization ferrite is fUpper sidebandP, unit: gauss; f. ofUpper sidebandThe frequency is the upper frequency of the ultra-wideband, the unit MHz is adopted, and the P value is 6.5-4.5.
3. The composite ferrite ultra-wideband circulator of claim 1, wherein: the value of the saturation magnetization of the ferrite with low saturation magnetization is fLower sideband frequencyThe unit,/P': gauss; f. ofLower sideband frequencyThe lower frequency of the ultra-wideband is set, the unit MHz is set, and the value P' is 3-4.
4. The composite ferrite ultra-wideband circulator of claim 2 or 3, wherein: and a metal coating is arranged on the surface of the high-permeability metal sheet.
5. The composite ferrite ultra-wideband circulator of claim 4, wherein: the metal coating is a nickel or gold coating.
6. The composite ferrite ultra-wideband circulator of claim 2 or 3, wherein: the external bias steady magnetic field comprises a first permanent magnet and a second permanent magnet which are arranged on the ferrite with high saturation magnetization from bottom to top, wherein the size of the contact surface of the first permanent magnet and the second permanent magnet is smaller than that of the second permanent magnet.
7. The composite ferrite ultra-wideband circulator of claim 6, wherein: an insulating pad is arranged between the first permanent magnet and the ferrite with high saturation magnetization.
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| CN110994101A (en) * | 2019-11-29 | 2020-04-10 | 苏州华博电子科技有限公司 | Composite ferrite ultra-wideband circulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110994101A (en) * | 2019-11-29 | 2020-04-10 | 苏州华博电子科技有限公司 | Composite ferrite ultra-wideband circulator |
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