Triple frequency circulator and electronic equipment

Abstract

The invention provides a frequency tripling circulator and electronic equipment, and the frequency tripling circulator comprises a grounding plate, a composite substrate located above the grounding plate, and an upper metal layer located on the composite substrate, the composite substrate comprises a ceramic substrate, and the surface of the ceramic substrate is provided with a through inner ferrite; the outer side of the inner ferrite is sequentially sleeved with a plurality of annular outer ferrites, and the saturation magnetization intensity of the inner ferrite and the saturation magnetization intensity of the outer ferrites are sequentially reduced from inside to outside; the upper metal layer comprises a central junction, the central junction is provided with three end points, each end point is connected with one port of the circulator through a metal transmission path, and the side edge of the central junction is provided with a plurality of SSPP grooves between two adjacent end points to form SSPPs branches. The scheme can have the characteristics of miniaturization and broadband, thereby satisfying more application scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of circulators, in particular to a triple frequency circulator and electronic equipment. Background Art

[0002] Circulators are an important basic device in microwave engineering. They are non-reversible devices with several ports. They contain gyromagnets made of gyromagnetic materials. Under the combined action of an external microwave magnetic field and a constant DC magnetic field, the gyromagnetic material produces gyromagnetic properties, causing the polarization rotation of the electromagnetic waves propagating in the gyromagnet, thereby achieving unidirectional transmission of high-frequency signal energy. Circulators have the characteristics of small size, light weight, and easy integration. They are widely used in various civil and military equipment such as civil communications, microwave measurement, communications, radar, electronic countermeasures, aerospace, etc., mainly to achieve antenna transmission and reception sharing, inter-stage isolation, and improve system matching.

[0003] With the development of civilian microwave technology and the intensification of international military product competition, the overall system has increasingly higher requirements on the structure and size, performance, and operating frequency band of each component. The research on the design and preparation of high-performance, wide-band microstrip circulators is of great significance, but the current circulator research can no longer meet the application needs in specific scenarios. Summary of the invention

[0004] The purpose of the present invention is to provide a triple frequency circulator and an electronic device, which can have both miniaturization and wide-band characteristics, so as to meet more application scenarios.

[0005] The technical solution provided by the present invention is as follows:

[0006] In a first aspect, the present application provides a triple frequency circulator, comprising a ground plate, a composite substrate located above the ground plate, and an upper metal layer located on the composite substrate:

[0007] The composite substrate comprises a ceramic substrate, and a penetrating inner ferrite is arranged on the surface of the ceramic substrate, and a plurality of annular outer ferrites are sequentially sleeved on the outer side of the inner ferrite, and the saturation magnetization intensity of the inner ferrite and the outer ferrite decreases from the inside to the outside;

[0008] The upper metal layer includes a central junction having three endpoints, and each endpoint is connected to a port of the circulator through a metal transmission path. The side of the central junction is provided with a plurality of SSPP grooves between two adjacent endpoints to form SSPPs branches.

[0009] In some embodiments, the sides of the central knot between two adjacent endpoints are straight edges;

[0010] The groove width of each of the SSPP grooves between two adjacent end points is equal, and the distance between two adjacent SSPP grooves is equal.

[0011] In some embodiments, the sides of the central knot between two adjacent endpoints are arc-shaped;

[0012] The groove widths of the SSPP grooves between two adjacent end points are equal, and the angles of separation between two adjacent SSPP grooves relative to the center of the center knot arc side plate are equal.

[0013] In some embodiments, the SSPP grooves between two adjacent end points are based on the middle groove, and the groove depths of the grooves on both sides gradually decrease.

[0014] In some embodiments, the outer side of the SSPPs branch is generally in an inwardly concave arc shape;

[0015] The three sides of the central knot are rotationally symmetrical at 120° about the center of the central knot.

[0016] In some embodiments, the metal transmission path is composed of multiple transmission line segments, and the overall width of each transmission line segment gradually decreases along the direction from the end point of the central junction to the corresponding port.

[0017] In some embodiments, the metal transmission path consists of three sections of transmission line;

[0018] The width of the first transmission line connected to the port is a first preset width; the width of the third transmission line connected to the end point of the center junction gradually decreases along the end point of the center junction to the corresponding port, and the width on the side away from the end point of the center junction is a third preset width; the width of the second transmission line between the first transmission line and the third transmission line is a second preset width; the first preset width is smaller than the second preset width, and the second preset width is smaller than the third preset width.

[0019] In some embodiments, the ceramic substrate is square, the inner ferrite is cylindrical, and the outer ferrite is ring-shaped;

[0020] The center of the ceramic substrate is offset by a preset distance relative to the center of the inner ferrite.

[0021] In some embodiments, the number of the outer ferrite is one,

[0022] The surfaces of the outer ferrite and the inner ferrite are flush with the surface of the ceramic substrate.

[0023] In a second aspect, the present application provides an electronic device comprising the triple frequency circulator of the first aspect.

[0024] The triple frequency circulator and electronic device provided by the present invention can have both miniaturization and wide-band characteristics, thereby meeting more application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present solution.

[0026] Figure 1 is a schematic diagram of the overall structure of a frequency tripler circulator according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of a top view of a frequency tripler circulator according to an embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the disassembled structure of the upper metal layer of a frequency tripler circulator according to an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of the dimensions of the upper metal layer of a frequency tripler circulator according to an embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of a top view of a composite substrate of a frequency tripler circulator according to an embodiment of the present invention;

[0031] Figure 6 is a simulation schematic diagram of a triple frequency circulator according to an embodiment of the present invention;

[0032] Figure 7 is a schematic diagram of the overall structure of a frequency tripler circulator according to another embodiment of the present invention;

[0033] Figure 8 is a schematic diagram of a top view of a frequency tripler circulator according to another embodiment of the present invention;

[0034] Fig. 9 is a schematic diagram of the dimensions of the upper metal layer of a frequency tripler circulator according to another embodiment of the present invention;

[0035] Fig.10 It is a simulation schematic diagram of a triple frequency circulator according to another embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0037] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0038] Circulators are an important basic device in microwave engineering. They are non-reversible devices with several ports. They contain gyromagnets made of gyromagnetic materials. Under the combined action of an external microwave magnetic field and a constant DC magnetic field, the gyromagnetic material produces gyromagnetic properties, causing the polarization rotation of the electromagnetic waves propagating in the gyromagnet, thereby achieving unidirectional transmission of high-frequency signal energy. Circulators allow signals to be transmitted from one port to the next, but prevent reverse transmission. For example, the signal is conductive from port 1 to port 2 and from port 2 to port 3, while the reverse transmission (from 2 to 1, from 3 to 2, and from 1 to 3) is isolated. This characteristic makes circulators very important in radar / communication systems, which can achieve isolation of transmit and receive signals and allow the same antenna to be shared by the transmitter and receiver. By design, the polarization plane of the electromagnetic wave is perpendicular to the grounded resistive plug during forward transmission, and the attenuation is very small; the polarization plane of the electromagnetic wave is parallel to the grounded resistive plug during reverse transmission, and is almost completely absorbed. Circulators have the characteristics of small size, light weight, and easy integration. They are widely used in various civil and military equipment such as civil communications, microwave measurement, communications, radar, electronic countermeasures, aerospace, etc., mainly to achieve antenna transmission and reception sharing, inter-stage isolation, and improve system matching.

[0039] With the development of civil microwave technology and the intensification of international military product competition, the overall system has higher and higher requirements on the structure and size, performance, working frequency band of each component. The research on designing and preparing high-performance, wide-band microstrip circulators is of great significance, but the current research on circulators can no longer meet the application in specific scenarios. By integrating lumped elements, a circulator with a very small size can be designed, and the circuit area can be reduced to 0.1λ0×0.1λ0, but its relative working bandwidth is very narrow, less than 10%; by using self-biased magnetic materials, the use of external bias magnets can be avoided, greatly reducing the longitudinal volume of the circulator, but most of these materials are still under development and are not mature enough for commercialization; there is also a circulator based on spatiotemporal modulation of electromagnetic signal propagation and does not require external magnetic bias. Although they are small in size, they require quite complex modulation circuits. In addition, they have high levels of insertion loss and poor linearity and can only handle low-power electromagnetic signals. Through the two loop conditions of the circulator, the theoretical maximum working bandwidth can be designed to be single octave, and the designed circulator size is relatively large, above 0.5λ0×0.5λ0. Therefore, the design of a circulator with both miniaturization and broadband characteristics is still a technical problem that needs to be solved urgently.

[0040] Because the thickness of the non-magnetic dielectric substrate affects the device's circulatory effect, in the existing scheme, based on the theory that the bandwidth of the thin film circulator is proportional to the ratio of the thickness of the thin film substrate, an attempt is made to dig a groove in the substrate to increase the ratio of the ferrite film to the dielectric substrate, and the circulator is etched with a cylindrical bottom groove at the bottom of the substrate, and the thickness of the substrate at the magnetized area is reduced to improve the circulator's circulatory effect. On the one hand, this method reduces the impedance value of the center junction, making the corresponding microstrip line impedance value larger and reducing the manufacturing difficulty. On the other hand, it also increases the working bandwidth of the circulator. However, in actual production, this method cannot keep the bottom groove surface flat and the position cannot be located in the middle, resulting in excessive device loss. In another existing scheme, a three-octave ultra-wideband microstrip circulator is designed by using a composite ferrite method. The ultra-wideband microstrip circulator is within the working frequency band of 6 to 18 GHz, but the difference between the measured results and the simulation results is relatively large, and low-field loss occurs. Another existing solution proposes a multi-octave MEMS (microelectromechanical system) silicon-based microstrip circulator. The matching section of the circulator is in a bent form, which makes the circulator further miniaturized. The size is 0.24λ0×0.24λ0 and the operating frequency is 5-13GHz. However, this method of bending the matching section will cause the coupling between metals to become more serious, which will affect the insertion loss and isolation within the circulator band, and will also affect the operating bandwidth of the circulator.

[0041] The main matching section of the circulator of the present application adopts multi-section matching, and is matched with a 50-ohm coaxial port according to the theory of a quarter-wavelength impedance matcher. The center junction adopts an edge-guided mode transmission form. In order to eliminate the influence of the reactance component, a series of slots are opened; or the center junction is in the form of a gradual arc, and a slot shaped like an SSPP branch is opened, which complements the original SSPP branch, and can play a role in miniaturization and impedance matching. At the same time, composite ferrite is used as the substrate of the circulator to achieve the purpose of expanding the working bandwidth. The following will be described in detail with reference to the accompanying drawings:

[0042] In one embodiment, the present application provides a triple frequency circulator, including a ground plate, a composite substrate located above the ground plate, and an upper metal layer located on the composite substrate.

[0043] The composite substrate includes a ceramic substrate, and a surface of the ceramic substrate is provided with a penetrating inner ferrite, and the outer side of the inner ferrite is sequentially sleeved with a plurality of annular outer ferrites, and the saturation magnetization intensity of the inner ferrite and the outer ferrite decreases from the inside to the outside. The present application does not limit the number of the outer ferrites. For example, in a specific implementation, the composite substrate includes an outer ferrite with a high saturation magnetization intensity and two inner ring ferrites with gradually decreasing magnetization intensity; for another example, referring to the appendix of the specification Figure 5 In a specific implementation, the number of outer ferrites is one, and the composite substrate includes an inner ferrite 22 with a high saturation magnetization and an outer ferrite 23 with a relatively lower magnetization. The surfaces of the outer ferrite 23 and the inner ferrite 22 are flush with the surface of the ceramic substrate 21. The present application also does not limit the shapes of the outer ferrite 23 and the inner ferrite 22. For example, in a specific implementation, the ceramic substrate 21 is square, the inner ferrite 22 is cylindrical, and the outer ferrite 23 is annular.

[0044] Preferably, the center of the ceramic substrate 21 is offset from the center of the inner ferrite 22 by a preset distance (eg, 0.5 mm-2 mm) in the Y-axis direction, which can further achieve miniaturization of the circulator structure.

[0045] The metal transmission path is composed of multiple transmission lines, and the overall width of each transmission line gradually decreases along the direction from the end point of the center junction to the corresponding port. The present application does not limit the specific number of multiple transmission lines. For example, in a specific implementation, the metal transmission path is composed of three transmission lines; the width of the first transmission line connected to the port is a first preset width; the width of the third transmission line connected to the end point of the center junction gradually decreases along the direction from the end point of the center junction to the corresponding port, and the width of the side away from the end point of the center junction is a third preset width; the width of the second transmission line between the first transmission line and the third transmission line is a second preset width; the first preset width is less than the second preset width, and the second preset width is less than the third preset width. The present application does not limit the specific values ​​of the first preset width, the second preset width, and the third preset width, and can be adjusted according to the actual usage scenario.

[0046] The upper metal layer includes a central junction, which has three endpoints, and each endpoint is connected to a port of the circulator through a metal transmission path. The three sides of the central junction are 120° rotationally symmetrical about the center of the central junction. The sides of the central junction are provided with a number of SSPP grooves between two adjacent endpoints to form SSPPs branches. The present application does not limit the specific form of the central junction. For example, the central junction can be triangular, circular, polygonal, etc., and it is only necessary to open an SSPP groove on the side of the central junction. The SSPP (Spoof Surface Plasmon Polariton) structure is an artificial periodic structure that simulates the characteristics of natural SPP (Surface Plasmon Polaritons) at microwave and terahertz frequencies. The SSPP structure has the advantages of broadband, low cross-coupling, low cost, low loss, etc., and has the advantages of strong field confinement, exhibiting the same dispersion characteristics as natural SPP, and its cutoff frequency can be changed by adjusting the shape and size of the groove.

[0047] In a specific implementation, refer to the attached specification. Figures 1 to 4A triple frequency circulator includes a ground plate 3, a composite substrate located above the ground plate 3, and an upper metal layer 1 located on the composite substrate. The composite substrate includes a ceramic substrate 21, and a penetrating inner ferrite 22 is provided on the surface of the ceramic substrate 21, and an annular outer ferrite 23 is sleeved on the outer side of the inner ferrite 22, and the saturation magnetization intensity of the inner ferrite 22 is greater than the saturation magnetization intensity of the outer ferrite 23. The thickness of the ceramic substrate 21, the inner ferrite 22 and the outer ferrite 23 are equal, the radius of the inner ferrite 22 is r1, r1 is between 5.1-5.3㎜, the radius of the outer ferrite 23 is r2, r2 is between 10-10.5㎜, the saturation magnetization intensity of the inner ferrite 22 is 1800Gauss, and the ferromagnetic resonance line width is 35Oe, the saturation magnetization intensity of the outer ferrite 23 is 1250Gauss, and the ferromagnetic resonance line width is 75Oe; the ceramic medium is in the shape of a square, with a side length of p, p is between 25-26㎜, and the relative dielectric constant is 20.3.

[0048] The upper metal layer 11 includes a central junction 14, which has three endpoints, and each endpoint is connected to a port of the circulator through a metal transmission path. The sides of the central junction 14 between two adjacent endpoints are straight edges, and the sides of the central junction 14 are provided with a plurality of SSPP grooves between two adjacent endpoints to form SSPPs branches, that is, the central junction adopts an edge-guided mode transmission form. The groove width of each SSPP groove between two adjacent endpoints is equal, and the distance between two adjacent SSPP grooves is equal. The outer side of the SSPPs branch is generally in an inwardly concave arc. The thickness of the upper metal layer 11 is t, t=0.005㎜, and the material is copper. The length of the first transmission line 11 is between 1.9-2 mm, and the width is w1, which is between 0.5-0.6 mm; the length of the second transmission line 12 is between 4.1-4.2 mm, and the width is w2, which is between 1.3-1.4 mm; the minimum width of the third transmission line 13 is w3, which is between 1.8-1.9 mm. The distance between the center O of the arc of the center node 14 and the center Z of the center node is The radius is r0, r0 is between 19-21 mm, and the angle is A groove is made on the center node between 30°-35°. The distance between the groove baseline and the center Z is d0, and d0 is between 2.3-2.5㎜. After the groove is made, the distance between the center lines of two adjacent branches is d1, and d1 is between 0.6-0.9㎜. The width of the groove is d2, and d2 is between 0.3-0.4㎜.

[0049] The electromagnetic wave starts to transmit from the right port along the microstrip line. Since the ferrite is positively magnetized by the magnet along the Z axis, the transmission of the electromagnetic wave will produce non-reciprocity, and it will be transmitted clockwise, that is, most of the energy is transmitted clockwise to the next port, while there is almost no energy along the counterclockwise port, which becomes an isolated port. The edge-guided mode device is in a traveling wave working state, with a wide working frequency band, which can achieve high indicators of forward loss, reverse isolation and input standing wave ratio within more than one octave; the operating frequency of the circulator is related to the saturation magnetization intensity of the ferrite. The introduction of the composite ferrite structure can broaden the operating frequency of the circulator. Combining these two methods, a microstrip circulator with both miniaturization and broadband characteristics can be finally realized. In this scheme, the design of the main matching section adopts a segmented matching strategy, based on the theoretical basis of the quarter-wavelength impedance transformer, to achieve efficient matching with the 50-ohm coaxial port. The design of the central node adopts an edge-guided mode transmission structure. The edge-guided mode device is in a traveling wave working state and has a wide working frequency band. It can achieve high indicators for forward loss, reverse isolation and input standing wave ratio within more than one octave, and a series of slots are opened to eliminate the influence of the reactance component, which has significant advantages for realizing the miniaturization of microwave devices. In addition, this scheme uses composite ferrite material as the substrate. Composite ferrite has a more uniform internal field when working, which can effectively improve the performance of microwave devices, thereby achieving a wider operating frequency range. The simulation results are shown in Figure 2. Figure 6 As shown, in the operating frequency band of 2-6 GHz, the insertion loss is less than 1 dB, the return loss is less than 15 dB, and the isolation is less than 15 dB.

[0050] In a specific implementation, refer to the attached specification. Figures 7 to 9 A triple frequency circulator includes a ground plate 3, a composite substrate located above the ground plate 3, and an upper metal layer 1 located on the composite substrate. The composite substrate includes a ceramic substrate 21, and a penetrating inner ferrite 22 is provided on the surface of the ceramic substrate 21, and an annular outer ferrite 23 is sleeved on the outer side of the inner ferrite 22, and the saturation magnetization intensity of the inner ferrite 22 is greater than the saturation magnetization intensity of the outer ferrite 23. The thickness of the ceramic substrate 21, the inner ferrite 22 and the outer ferrite 23 are equal, the radius of the inner ferrite 22 is r1, r1 is between 3-6 mm, the radius of the outer ferrite 23 is r2, r2 is between 8-10 mm, the saturation magnetization intensity of the inner ferrite 22 is 1100 Gauss, and the ferromagnetic resonance line width is 95 Oe, the saturation magnetization intensity of the outer ferrite 23 is 1000 Gauss, and the ferromagnetic resonance line width is 50 Oe; the ceramic medium is square in shape, with a side length of p, p is between 23-27 mm, and the relative dielectric constant is 20.3.

[0051] The upper metal layer 11 includes a center junction 14, which has three endpoints, and each endpoint is connected to a port of the circulator through a metal transmission path. The sides of the center junction 14 between two adjacent endpoints are arc-shaped, and the sides of the center junction 14 are provided with a plurality of SSPP grooves between two adjacent endpoints to form SSPPs branches, that is, the center junction presents a gradual arc form. The outer side of the SSPPs branch is an arc-shaped that is concave inward as a whole. The groove width of each SSPP groove between two adjacent endpoints is equal, and the distance between two adjacent SSPP grooves is equal. The outer side of the SSPPs branch is an arc-shaped that is concave inward as a whole. The thickness of the upper metal layer 11 is t, t is in the range of several microns to tens of microns, and the material is copper. The length of the first transmission line 11 is the length of the microstrip line connected to the fifty-ohm coaxial port, the length can be between one millimeter and several millimeters, the width is w1, and w1 is between 0.3-0.5㎜; the length of the second transmission line 12 is between 2.9-3.3㎜, the width is w2, and w2 is between 0.7-0.9㎜; the length of the third transmission line 13 is between 1.2-1.6㎜, the maximum width is w3, and w3 is between 3.7-3.9㎜.

[0052] The distance between the center of the center knot arc O1 and the center of the center knot O is x0, x0 is between 16-19 mm, the radius is r0, r0 is between 13-14 mm, the SSPP slot is generated by rotating and replicating the center O1 to both sides based on the middle, the slot width of each SSPP slot between two adjacent endpoints is equal, and the angles between two adjacent SSPP slots relative to the center of the center knot arc side plate are equal. Each SSPP slot between two adjacent endpoints is based on the middle slot, and the slot depths on both sides gradually decrease. The reference SSPP (i.e., the middle slot of each SSPP slot between two adjacent endpoints) has a slot length of lc, lc is between 2-2.2 mm, and a width of wc, wc is between 0.1-0.5 mm. In order to maintain impedance matching when electromagnetic waves transition in the SSPP structure, the lengths of other slots decrease by 0.04mm-0.06mm in sequence, and the width remains wc.

[0053] The electromagnetic wave starts to be transmitted from the right port along the microstrip line. Since the ferrite is positively magnetized along the Z axis by the magnet, the transmission of the electromagnetic wave will produce non-reciprocity, and it will be transmitted clockwise, that is, most of the energy is transmitted clockwise to the next port, while there is almost no energy along the counterclockwise port, which becomes an isolated port. In the present invention, since the artificial plasmon has a strong dispersion characteristic, it will increase the equivalent waveguide wavelength of the electromagnetic wave, which is equivalent to introducing a complementary artificial plasmon to play a miniaturized role. The operating frequency of the circulator is related to the saturation magnetization intensity of the ferrite. The introduction of the composite ferrite structure can broaden the operating frequency of the circulator. Combining these two methods, a microstrip circulator with both miniaturization and broadband characteristics can be finally realized. In this scheme, the design of the main matching section adopts a segmented matching strategy, and based on the theoretical basis of the quarter-wavelength impedance transformer, efficient matching with the 50-ohm coaxial port is achieved. The design of the central node adopts a gradient arc structure, and introduces the notch of the SSPP branch to enhance its dispersion characteristics. The SSPP structure has significant advantages in miniaturizing microwave devices due to its inherent strong dispersion characteristics. In addition, in order to further expand the working bandwidth of the circulator, this scheme uses composite ferrite materials as the substrate. Composite ferrite has a more uniform internal field when working, which can effectively improve the performance of microwave devices and achieve a wider operating frequency range. The simulation results are shown in Figure 2. Fig.10 As shown, in the operating frequency band of 2-6 GHz, the insertion loss is less than 1 dB, the return loss is less than 15 dB, and the isolation is less than 15 dB.

[0054] In one embodiment, the present application further provides an electronic device, comprising the triple frequency circulator of the aforementioned embodiment.

[0055] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A triple frequency circulator, characterized in that: The invention comprises a ground plate, a composite substrate located above the ground plate, and an upper metal layer located on the composite substrate: The composite substrate comprises a ceramic substrate, and a penetrating inner ferrite is arranged on the surface of the ceramic substrate, and a plurality of annular outer ferrites are sequentially sleeved on the outer side of the inner ferrite, and the saturation magnetization intensity of the inner ferrite and the outer ferrite decreases from the inside to the outside; The upper metal layer includes a central junction having three endpoints, and each endpoint is connected to a port of the circulator through a metal transmission path. The side of the central junction is provided with a plurality of SSPP grooves between two adjacent endpoints to form SSPPs branches.

2. The triple frequency circulator according to claim 1, characterized in that: The sides of the center knot between two adjacent endpoints are all straight edges; The groove width of each of the SSPP grooves between two adjacent end points is equal, and the distance between two adjacent SSPP grooves is equal.

3. The triple frequency circulator according to claim 1, characterized in that: The sides of the central knot between two adjacent endpoints are all arc-shaped; The groove widths of the SSPP grooves between two adjacent end points are equal, and the angles of separation between two adjacent SSPP grooves relative to the center of the center knot arc side plate are equal.

4. The triple frequency circulator according to claim 3, characterized in that: Each of the SSPP grooves between two adjacent end points is based on the middle groove, and the groove depths of the grooves on both sides gradually decrease.

5. The triple frequency circulator according to any one of claims 2 to 4, characterized in that: The outer side of the SSPPs branch is generally in an inwardly concave arc shape; The three sides of the central knot are rotationally symmetrical about the center of the central knot by 120 degrees.

6. The triple frequency circulator according to claim 1, characterized in that: The metal transmission path is composed of multiple transmission lines, and the overall width of each transmission line is gradually reduced along the direction from the end point of the central junction to the corresponding port.

7. The triple frequency circulator according to claim 6, characterized in that: The metal transmission path is composed of three sections of transmission lines; The width of the first transmission line connected to the port is a first preset width; the width of the third transmission line connected to the end point of the center junction gradually decreases along the end point of the center junction to the corresponding port, and the width on the side away from the end point of the center junction is a third preset width; the width of the second transmission line between the first transmission line and the third transmission line is a second preset width; the first preset width is smaller than the second preset width, and the second preset width is smaller than the third preset width.

8. The triple frequency circulator according to claim 1, characterized in that: The ceramic substrate is square, the inner ferrite is cylindrical, and the outer ferrite is annular; The center of the ceramic substrate is offset by a preset distance relative to the center of the inner ferrite.

9. The triple frequency circulator according to claim 1, characterized in that: The number of the outer ferrite is one, The surfaces of the outer ferrite and the inner ferrite are flush with the surface of the ceramic substrate.

10. An electronic device, characterized in that: A triple frequency circulator comprising the one described in any one of claims 1 to 9.

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