Power divider

Abstract

The invention provides a power divider, which comprises a ceramic substrate, a magnetic core, an impedance capacitor and an isolation resistor, and is characterized in that an input end electrode, a first output end electrode, a second output end electrode and a grounding end electrode are arranged on the outer surface of the ceramic substrate; the magnetic core is arranged on the outer surface of one side of the ceramic base body in the thickness direction, the magnetic core is in a square ring shape, a power distribution winding is wound on the magnetic core, and the power distribution winding is configured to distribute an input signal of the input end electrode to the first output end electrode and the second output end electrode; the impedance capacitor is arranged on the outer surface of the ceramic substrate, one end of the impedance capacitor is connected with the input end electrode, and the other end is connected with the grounding end electrode; the isolation resistor is arranged on the outer surface of the ceramic substrate, and the isolation resistor is connected between the first output end electrode and the second output end electrode. The power divider can achieve the purposes of small size, wide frequency band and high reliability.

Description

Technical Field

[0001] The present application belongs to the field of microwave communication technology, and more specifically, relates to a power divider. Background Art

[0002] Power divider, also known as power divider, is an important microwave passive device in RF and microwave circuits. A power divider is a device that divides the energy of one input signal into multiple output signals. The power divider is mainly composed of a ceramic substrate and multiple branches arranged in the ceramic substrate. A good power divider requires a relatively wide operating frequency band, low insertion loss, and high isolation between multiple output signals.

[0003] In the power divider in the related art, the components in multiple branches are irregularly arranged in a ceramic matrix, which makes the ceramic matrix larger in volume, thereby making the outer size of the power divider larger. Summary of the invention

[0004] The embodiments of the present application provide a power divider that can achieve both small size and wide frequency band.

[0005] The present application provides a power divider, including a ceramic substrate, a magnetic core, an impedance capacitor and an isolation resistor, wherein an input electrode, a first output electrode, a second output electrode and a ground electrode are provided on the outer surface of the ceramic substrate; the magnetic core is arranged on one side outer surface of the ceramic substrate in the thickness direction, the magnetic core is in a square ring shape, a power distribution winding is wound on the magnetic core, and the power distribution winding is configured to distribute the input signal of the input electrode to the first output electrode and the second output electrode; the impedance capacitor is arranged on the outer surface of the ceramic substrate, one end of the impedance capacitor is connected to the input electrode, and the other end is connected to the ground electrode; the isolation resistor is arranged on the outer surface of the ceramic substrate, and the isolation resistor is connected between the first output electrode and the second output electrode.

[0006] In some embodiments, the magnetic core includes a first magnetic strip and a second magnetic strip, and a first magnetic column, a second magnetic column and a third magnetic column connected between the first magnetic strip and the second magnetic strip; the first magnetic strip and the second magnetic strip extend in a direction perpendicular to the thickness direction of the ceramic substrate, the first magnetic strip and the second magnetic strip are spaced apart in the thickness direction of the ceramic substrate, and the first magnetic strip is connected to the ceramic substrate; the third magnetic column is located between the first magnetic column and the second magnetic column, a part of the power distribution winding is wound around the first magnetic column to form a power matching winding, and the other part is wound around the second magnetic column to form an impedance matching winding to form two magnetic circuits.

[0007] In some embodiments, the first magnetic column is perpendicular to the first magnetic stripe, the first magnetic column is perpendicular to the second magnetic stripe, and the first magnetic column, the second magnetic column and the third magnetic column are parallel to each other.

[0008] In some embodiments, the maximum dimensions of the magnetic core are: length 2.48 mm, height 1.9 mm, and width 1.0 mm, that is, the maximum dimensions of the magnetic core are 2.48 mm*1.9 mm*1.0 mm.

[0009] In some embodiments, the first magnetic strip is bonded to the ceramic matrix.

[0010] In some embodiments, the power distribution winding includes a first coil, a second coil and a third coil wound on the first magnetic column, and a fourth coil and a fifth coil wound on the second magnetic column; the input end of the first coil is connected to the input end electrode, the output end of the first coil and the input end of the second coil form a first common end, the output end of the second coil is connected to the input end of the third coil, and the output end of the third coil is connected to the ground end electrode to form the power matching winding; the input end of the fourth coil and the input end of the fifth coil form a second common end, the second common end is connected to the first common end, and the output end of the fourth coil is connected to the first output end electrode; the output end of the fifth coil is connected to the second output end electrode to form the impedance matching winding.

[0011] In some embodiments, the capacitor includes a first electrode portion and a second electrode portion, the first electrode portion and the second electrode portion are arranged on two opposite outer surfaces of the ceramic substrate in the thickness direction, and one of the first electrode portion and the second electrode portion is connected to the ground electrode.

[0012] In some embodiments, the capacitor also includes a third conductive portion arranged on the side surface of the ceramic substrate, the third conductive portion is located between the first conductive portion and the second electrode portion, the third conductive portion is connected to the second electrode portion on one side in the thickness direction of the ceramic substrate, and is spaced apart from the first electrode portion on the other side.

[0013] In some embodiments, a first auxiliary electrode is further provided on the outer surface of the ceramic substrate. The first auxiliary electrode, the second electrode portion, and the ceramic substrate are located on the same side of the ceramic substrate in the thickness direction, and the first auxiliary electrode is connected between the second electrode portion and the ground electrode.

[0014] In some embodiments, the outer surface of the ceramic substrate is also provided with a reserved end electrode and a second auxiliary electrode located on the same side as the magnetic core, the reserved end electrode, the second auxiliary electrode and the first electrode portion are located on the same side of the ceramic substrate in the thickness direction, and the reserved end electrode is connected to the first electrode portion through the second auxiliary electrode.

[0015] In some embodiments, the input electrode includes two first electrode conductive parts and a conductive through hole connected between the two first electrode conductive parts, the two first electrode conductive parts are arranged on the outer surfaces of the ceramic substrate on both sides opposite to each other in the thickness direction, and the conductive through hole penetrates the ceramic substrate along the thickness direction of the ceramic substrate.

[0016] In some embodiments, the input electrode also includes a second electrode conductive portion arranged on the side surface of the ceramic substrate, the second electrode conductive portion is located between two second electrode conductive portions, the second electrode conductive portion is connected to one of the first electrode conductive portions on one side in the thickness direction of the ceramic substrate, and is spaced apart from the other first electrode conductive portion on the other side.

[0017] In some embodiments, the structures of the first output terminal electrode, the second output terminal electrode and the ground terminal electrode are the same as the structure of the input terminal electrode.

[0018] In some embodiments, the power distribution winding is electrically connected to at least one of the input terminal electrode, the first output terminal electrode, the second output terminal electrode, and the ground terminal electrode by spot welding.

[0019] In some embodiments, the power distribution winding is enameled copper wire.

[0020] In some embodiments, the ceramic substrate is a cubic structure with a side length of 3.81 mm and a thickness of 0.65 mm, that is, the size of the ceramic substrate is 3.81 mm*3.81 mm*0.65 mm.

[0021] The power divider provided by the present application has the beneficial effect that, compared with the related art in which the power distribution circuit of the power divider is arranged inside the ceramic substrate, the power divider provided by the present application, by arranging a magnetic core, an impedance capacitor and an isolation resistor on the outer surface of the ceramic substrate, the power distribution winding is wound on the magnetic core, the impedance capacitor is connected between the input terminal electrode and the ground terminal electrode, and the isolation resistor is connected between the first output terminal electrode and the second output terminal electrode. That is to say, by combining the ceramic substrate with the magnetic core winding, the input signal of the input terminal electrode is distributed to the first output terminal electrode and the second output terminal electrode. In this way, not only the input terminal standing wave of the power divider is relatively small, the isolation between the first output terminal electrode and the second output terminal electrode is increased, which is beneficial to expand the frequency range of the power divider, but also, while simplifying the structure of the power divider, it is beneficial to the miniaturized design of the power divider volume, and at the same time, the preparation process of the power divider is simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic diagram of the appearance structure of a power divider provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 A partial structural diagram of the power divider in FIG.

[0025] Figure 3 for Figure 1 A schematic diagram of the combined structure of the magnetic core and the power distribution winding in the power divider;

[0026] Figure 4 An equivalent circuit schematic diagram of a power divider provided in an embodiment of the present application;

[0027] Figure 5 for Figure 1 A top view of

[0028] Figure 6 for Figure 1 Bottom view of .

[0029] Among them, the reference numerals in the figure are:

[0030] 1. grounding electrode; 3. first output electrode; 4. second output electrode; 5. reserved electrode; 6. input electrode; 61. first electrode conductive part; 62. conductive through hole; 63. second electrode conductive part; 7. first auxiliary electrode; 8. second auxiliary electrode;

[0031] 10. Ceramic substrate; 11. First electrode portion; 12. Second electrode portion; 13. Third electrode portion;

[0032] 20. Magnetic core; 21. First magnetic strip; 22. Second magnetic strip; 23. First magnetic column; 24. Second magnetic column; 25. Third magnetic column;

[0033] 31. Power matching winding; 32. Impedance matching winding;

[0034] Isolation resistor R; impedance capacitor C1; first capacitor C2; second capacitor C3;

[0035] The first coil L1; the second coil L2; the third coil L3; the fourth coil L4; and the fifth coil L5. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0038] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] Power divider, also known as power divider, is an important microwave passive device in RF and microwave circuits. A power divider is a device that divides the energy of one input signal into multiple output signals. The power divider is mainly composed of a ceramic substrate and multiple branches arranged in the ceramic substrate. A good power divider requires a relatively wide operating frequency band, low insertion loss, and high isolation between multiple output signals.

[0041] In the power divider in the related art, the components in multiple branches are irregularly arranged in the ceramic matrix, which makes the volume of the ceramic matrix larger, thereby making the size of the power divider larger. As the power divider develops towards miniaturization, some power dividers usually use low-temperature co-fired ceramic technology (LTCC) to print multiple components of multiple branches on multiple ceramic diaphragms. This can only reduce the volume of the power divider to a certain extent. When the multiple branches of the power divider are more complicated, in order to meet the performance indicators, either the area of ​​the ceramic diaphragm is increased or the number of ceramic diaphragms is increased. This will not only increase the volume of the power divider, but also increase the number of processing steps; if a smaller volume is used, the frequency band range will be narrower, resulting in the inability to meet the performance indicators. At the same time, the processing difficulty is greater and the cost is higher.

[0042] In order to solve the problem that the power divider in the related art cannot take into account both the frequency band range and miniaturization, the present application provides a power divider.

[0043] like Figures 1 to 3 As shown, the power divider includes a ceramic substrate 10, a magnetic core 20, an impedance capacitor C1 and an isolation resistor R. An input electrode 6, a first output electrode 3, a second output electrode 4 and a ground electrode 1 are provided on the outer surface of the ceramic substrate 10; the magnetic core 20 is arranged on one side of the outer surface of the ceramic substrate 10 in the thickness direction, and the magnetic core 20 is in a square ring shape. A power distribution winding is wound on the magnetic core 20, and the power distribution winding is configured to distribute the input signal of the input electrode 6 to the first output electrode 3 and the second output electrode 4; the impedance capacitor C1 is arranged on the outer surface of the ceramic substrate 10, one end of the impedance capacitor C1 is connected to the input electrode 6, and the other end is connected to the ground electrode 1; the isolation resistor R is arranged on the outer surface of the ceramic substrate 10, and the isolation resistor R is connected between the first output electrode 3 and the second output electrode 4.

[0044] The above power divider is a two-way power divider.

[0045] The ceramic substrate 10 is a cubic structure made of ceramic material, and mainly plays the role of bearing and insulation. Usually, the ceramic substrate 10 is a cubic structure.

[0046] The magnetic core 20 is designed to be a square ring. On the one hand, compared with shapes such as a circular ring or an elliptical ring, such a design increases the contact area between the magnetic core 20 and the ceramic substrate 10, making the connection between the magnetic core 20 and the ceramic substrate 10 more secure. On the other hand, the magnetic core 20 is made into a ring, that is, closed, which reduces the risk of magnetic leakage, thereby helping to improve the performance of the power divider.

[0047] Compared with the related art in which the power distribution circuit of the power divider is set inside the ceramic substrate 10, the power divider provided in the present application is provided with a magnetic core 20, an impedance capacitor C1 and an isolation resistor R on the outer surface of the ceramic substrate 10, and the power distribution winding is wound on the magnetic core 20. The impedance capacitor C1 is connected between the input electrode 6 and the ground electrode 1, and the isolation resistor R is connected between the first output electrode 3 and the second output electrode 4. That is to say, by combining the ceramic substrate 10 with the winding of the magnetic core 20, the input signal of the input electrode 6 is distributed to the first output electrode 3 and the second output electrode 4. In this way, not only the input standing wave of the power divider is relatively small, but also the isolation between the first output electrode 3 and the second output electrode 4 is increased, which is beneficial to expand the frequency range of the power divider. Moreover, while simplifying the structure of the power divider, it is beneficial to the miniaturization design of the power divider volume, and at the same time, the preparation process of the power divider is simplified.

[0048] In addition, the isolation resistor R is usually formed on the surface of the ceramic substrate 10 by thick film technology, and the resistance can be fine-tuned by laser resistance adjustment. The isolation resistor R has high precision, so that the output signals of each channel have good consistency. The power divider has a small size, high integration, light weight, enhanced environmental adaptability, and high reliability.

[0049] like Figure 2 As shown, the ceramic substrate 10 may be a cubic structure of 3.81 mm*3.81 mm*0.65 mm.

[0050] Such a design provides a larger platform for the magnetic core 20, which is not only conducive to controlling the size of the power divider in the thickness direction of the ceramic substrate, but also convenient for arranging the input electrode 6, the first output electrode 3, the second output electrode 4 and the ground electrode 1.

[0051] The above-mentioned cubic structure can be a rectangular parallelepiped or a cube, which is not specifically limited here.

[0052] The following takes a cubic structure of the ceramic substrate 10 with dimensions of 3.81 mm * 3.81 mm * 0.65 mm for illustration.

[0053] As Figure 3 shown, in some embodiments, the magnetic core 20 includes a first magnetic strip 21 and a second magnetic strip 22, as well as a first magnetic column 23, a second magnetic column 24, and a third magnetic column 25 connected between the first magnetic strip 21 and the second magnetic strip 22; the first magnetic strip 21 and the second magnetic strip 22 extend in a direction perpendicular to the thickness direction of the ceramic substrate 10, the first magnetic strip 21 and the second magnetic strip 22 are arranged at intervals along the thickness direction of the ceramic substrate 10, and the first magnetic strip 21 is connected to the ceramic substrate 10; the third magnetic column 25 is located between the first magnetic column 23 and the second magnetic column 24, and a part of the power distribution winding is wound around the first magnetic column 23 as the power matching winding 31, and the other part is wound around the second magnetic column 24 as the impedance matching winding 32 to form two magnetic circuits.

[0054] For the above two magnetic circuits, we refer to the part of the winding wound around the first magnetic column 23 as the power matching winding 31, and the part of the winding wound around the second magnetic column 24 as the impedance matching winding 32. That is to say, the two magnetic circuits are respectively the power matching circuit and the power matching circuit.

[0055] By winding the power distribution winding around the first magnetic column 23 and the second magnetic column 24 to form two magnetic circuits, it is beneficial to increase the frequency band range of the power divider.

[0056] As Figure 1 and Figure 3 shown, in some embodiments, the first magnetic column 23 is perpendicular to the first magnetic strip 21, the first magnetic column 23 is perpendicular to the second magnetic strip 22, and the first magnetic column 23, the second magnetic column 24, and the third magnetic column 25 are parallel to each other in pairs.

[0057] Through the above settings, the magnetic core 20 is in the shape of a "day" character in the cross-section perpendicular to the thickness direction and is placed horizontally on the ceramic substrate 10. The first magnetic strip 21 and the second magnetic strip 22 are equivalent to the two vertical lines of the "day" character, and the first magnetic column 23, the second magnetic column 24, and the third magnetic column 25 are equivalent to the three horizontal lines of the "day" character. In this way, the length of the first magnetic strip 21 can be maximized, that is, the distance between the first magnetic column 23 and the second magnetic column 24 is increased. In this way, not only is the magnetic core 20 more firmly fixed to the ceramic substrate 10, but also, when the volume and width of the magnetic core 20 remain unchanged, while increasing the length of the first magnetic strip 21, the height of the first magnetic column 23 can be reduced, which is beneficial to reducing the size of the overall shape of the power divider in the thickness direction of the ceramic substrate 10, beneficial to reducing the volume of the power divider, and at the same time, reducing the interference between the signals of the two magnetic circuits, thus being beneficial to improving the performance of the power divider.

[0058] As Figure 3 As shown, the maximum outer dimensions of the magnetic core 20 are 2.48 mm*1.9 mm*1.0 mm.

[0059] The above-mentioned maximum outer dimensions are the length, width and height of the outermost contour of the magnet.

[0060] That is, the width (thickness) of the magnetic core 20 is 1.0 mm, and in a cross section perpendicular to the thickness direction, the length is 2.48 mm and the height is 1.9 mm.

[0061] Since the magnetic core 20 is disposed on one side surface of the ceramic substrate 10 in the thickness direction, and at the same time, along the thickness direction of the ceramic substrate 10, the projection of the magnetic core 20 on the ceramic substrate 10 is inside the ceramic substrate 10. The power divider in the height direction (the thickness direction of the ceramic substrate 10) is 2.7 mm in total, which is the thickness of the ceramic substrate 10 (0.65 mm) plus the height of the magnetic core 20 (1.9 mm); and the size of the power divider in the direction perpendicular to the height direction is the same as the size of the ceramic substrate 10, which is 3.81 mm*3.81 mm. Finally, the maximum outer size of the power divider is 3.81 mm*3.81 mm*2.7 mm.

[0062] The first magnetic strip 21 is glued to the ceramic matrix 10. This ensures that the first magnetic strip 21 and the ceramic matrix 10 are firmly connected.

[0063] In order to further improve the connection degree, the first magnetic strip 21 and the ceramic matrix 10 may be fixed by using epoxy resin with higher viscosity.

[0064] like Figure 1 , Figure 4 and Figure 5 As shown, the power distribution winding includes a first coil L1, a second coil L2 and a third coil L3 wound on the first magnetic column 23, and a fourth coil L4 and a fifth coil L5 wound on the second magnetic column 24; the input end of the first coil L1 is connected to the input end electrode 6, the output end of the first coil L1 and the input end of the second coil L2 form a first common terminal, the output end of the second coil L2 is connected to the input end of the third coil L3, and the output end of the third coil L3 is connected to the ground terminal electrode 1 to form a power matching winding 31; the input end of the fourth coil L4 and the input end of the fifth coil L5 form a second common terminal, the second common terminal is connected to the first common terminal, and the output end of the fourth coil L4 is connected to the first output terminal electrode 3; the output end of the fifth coil L5 is connected to the second output terminal electrode 4 to form an impedance matching winding 32.

[0065] Specifically, the power distribution winding is connected with the input terminal electrode 6, the first output terminal electrode 3, the second output terminal electrode 4, the ground terminal electrode 1, the impedance capacitor C1 and the isolation resistor R to form a power distribution circuit of the power divider. The schematic diagram of the power distribution circuit is as follows: Figure 4 shown.

[0066] It should be noted that if Figure 4 The power distribution circuit shown also includes a first capacitor C2 and a second capacitor C3 . In fact, the first capacitor C2 and the second capacitor C3 are two parasitic capacitors generated by the fourth coil L4 and the fifth coil L5 wound around the second magnetic column 24 .

[0067] The power distribution winding can be enameled copper wire, that is, the first coil L1, the second coil L2, the third coil L3, the fourth coil L4 and the fifth coil L5 can all be made of enameled copper wire. Since the enameled copper wire is relatively soft and has good flexibility, it is convenient to wind it on the magnetic core 20 and has good reliability; at the same time, the DC resistance and resistivity are small, so that the power divider has small loss during operation, which is conducive to reducing losses and improving the performance of the power divider.

[0068] It should be noted that the input terminal electrode 6, the first output terminal electrode 3, the second output terminal electrode 4 and the ground terminal electrode 1 are actually welding pads for welding with the coils of the power distribution winding.

[0069] The above pads are printed with palladium silver at the bottom, and then nickel-plated and gold-plated. The gold-plated surface of the pad can be better for hot pressing welding, and the gold layer will not be oxidized by tin, so it can be better stored and easy to weld. The thickness of the gold layer is ≤1um, and it can be directly welded without the need for gold removal during welding.

[0070] The power distribution winding is electrically connected to at least one of the input terminal electrode 6, the first output terminal electrode 3, the second output terminal electrode 4 and the ground terminal electrode 1 by spot welding. That is to say, the two ends of the first coil L1, the second coil L2 and the third coil L3, the fourth coil L4 and the fifth coil L5 are electrically connected to the corresponding input terminal electrode 6, the first output terminal electrode 3, the second output terminal electrode 4 and the ground terminal electrode 1 by electric welding. With such a setting, the power divider reduces the probability of generating parasitic parameters.

[0071] like Figure 2 As shown, in some embodiments, the input electrode 6 includes two first electrode conductive parts 61 and a conductive through hole 62 connected between the two first electrode conductive parts 61, the two first electrode conductive parts 61 are arranged on the outer surfaces of the ceramic substrate 10 on both sides opposite to each other in the thickness direction, and the conductive through hole 62 penetrates the ceramic substrate 10 along the thickness direction of the ceramic substrate 10.

[0072] Through the above arrangement, the input terminal electrode 6 is not only convenient for welding with the power distribution winding, but also convenient for reliable connection with external devices.

[0073] like Figure 2As shown, in some embodiments, the input electrode 6 also includes a second electrode conductive portion 63 on the side surface of the ceramic substrate 10, the second electrode conductive portion 63 is located between two second electrode conductive portions 63, and the second electrode conductive portion 63 is connected to one of the first electrode conductive portions 61 on one side in the thickness direction of the ceramic substrate 10, and is spaced apart from the other first electrode conductive portion 61 on the other side.

[0074] By arranging the second electrode conductive part 63 on the side surface of the ceramic base 10, not only the positioning of the two first electrode conductive parts 61 of the input terminal electrode 6 is facilitated, but also the second electrode conductive part 63 can assist welding.

[0075] Of course, the input terminal electrode 6 may not include the second electrode conductive portion 63 disposed on the side surface of the ceramic substrate 10 , which is not specifically limited here.

[0076] It should be noted that the structures of the first output-end electrode 3 , the second output-end electrode 4 and the grounding-end electrode 1 are the same as the structure of the above-mentioned input-end electrode 6 , and will not be described in detail herein.

[0077] like Figure 2 As shown, in some embodiments, the impedance capacitor C1 includes a first electrode portion 11 and a second electrode portion 12, and the first electrode portion 11 and the second electrode portion 12 are arranged on the outer surfaces of the ceramic substrate 10 on both sides opposite to each other in the thickness direction, and one of the first electrode portion 11 and the second electrode portion 12 is connected to the ground electrode.

[0078] The parameters of the impedance capacitor C1 are determined by combining the areas of the first electrode portion 11 and the second electrode portion 12 and the thickness of the ceramic substrate 10 .

[0079] For example, Figure 2 As shown, the first electrode portion 11 is located on the upper surface of the ceramic substrate 10 , that is, on the same side as the magnetic core 20 , and the second electrode portion 12 is located on the lower surface of the ceramic substrate 10 .

[0080] like Figure 2 As shown, in some embodiments, the impedance capacitor C1 also includes a third conductive portion arranged on the side surface of the ceramic substrate 10, the third conductive portion is located between the first conductive portion and the second electrode portion 12, and the third conductive portion is connected to the second electrode portion 12 on one side in the thickness direction of the ceramic substrate 10, and is spaced apart from the first electrode portion 11 on the other side.

[0081] Through the above arrangement, the structure of the impedance capacitor C1 is different from the structure of the input terminal electrode 6 in that it only does not include the conductive through hole 62, so that the preparation process of the power divider can be simplified. Of course, when the input terminal electrode 6 does not include the second electrode conductive portion 63 provided on the side surface of the ceramic substrate 10, the impedance capacitor C1 also does not include the third conductive portion, thereby being consistent with the input terminal electrode 6.

[0082] like Figure 2 As shown, in some embodiments, the outer surface of the ceramic substrate 10 is further provided with a first auxiliary electrode 7, the first auxiliary electrode 7 and the second electrode portion 12 and the ceramic substrate 10 are located on the same side of the ceramic substrate 10 in the thickness direction, and the first auxiliary electrode 7 is connected between the second electrode portion 12 and the ground electrode. In this way, the impedance capacitor C1 can also be used as another auxiliary grounding terminal, that is, a part of the coils in the power distribution winding connected to the grounding electrode 1 is connected to the first electrode portion 11 to achieve connection with the grounding electrode 1. In this way, the number of coils connected to the grounding electrode 1 of the power distribution winding is reduced, which is conducive to improving the reliability of the electrical connection of the power distribution winding.

[0083] like Figure 2 As shown, in some embodiments, the outer surface of the ceramic substrate 10 is also provided with a reserved end electrode 5 and a second auxiliary electrode 8 located on the same side as the magnetic core 20, the reserved end electrode 5, the second auxiliary electrode 8 and the first electrode portion 11 are located on the same side of the ceramic substrate 10 in the thickness direction, and the reserved end electrode 5 is connected to the first electrode portion 11 through the second auxiliary electrode 8.

[0084] By setting the reserved terminal electrode 5, a part of the coils in the power distribution winding connected to the ground terminal electrode 1 can be connected to the reserved terminal electrode 5, thereby indirectly connecting to the ground terminal electrode 1. In this way, not only the number of coils connected to the ground terminal electrode 1 of the power distribution winding is further reduced, thereby being more conducive to improving the electrical connection reliability of the power distribution winding 31, but also, as Figure 2 As shown, along the thickness direction of the magnetic core 20, the first electrode portion 11 and the reserved end electrode 5 are located on opposite sides of the magnetic core 20. In this way, the risk of a part of the coil connected to the grounding end electrode 1 in the power distribution winding being too long or too short to be connected to the first electrode portion 11 or the grounding end electrode 1 is reduced.

[0085] To sum up, the maximum size of the power divider provided in this application is 3.81mm*3.81mm*2.7mm. Through electromagnetic simulation and reasonable calculation, the impedance matching winding 32, the power distribution winding and the isolation resistor R are selected, the material and size of the magnetic core, the wire diameter and number of turns of the enameled copper wire, the size of the isolation resistor R and the impedance capacitor C1 are determined, and the characteristic impedance of the input port, the length of the two branches, and the characteristic impedance of the output port are calculated, so that the power divider can achieve the performance requirements of low loss, first standing wave ratio and high isolation within the frequency band of 1MHz~1GHz.

[0086] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A power divider, characterized in that: include: A ceramic substrate, wherein an input terminal electrode, a first output terminal electrode, a second output terminal electrode and a ground terminal electrode are arranged on the outer surface of the ceramic substrate; A magnetic core, arranged on one side outer surface of the ceramic substrate in the thickness direction, the magnetic core is in a square ring shape, a power distribution winding is wound on the magnetic core, and the power distribution winding is configured to distribute the input signal of the input terminal electrode to the first output terminal electrode and the second output terminal electrode; An impedance capacitor is arranged on the outer surface of the ceramic substrate, one end of the impedance capacitor is connected to the input terminal electrode, and the other end is connected to the ground terminal electrode; The isolation resistor is arranged on the outer surface of the ceramic substrate, and the isolation resistor is connected between the first output terminal electrode and the second output terminal electrode.

2. The power divider according to claim 1, characterized in that: The magnetic core includes a first magnetic strip and a second magnetic strip, and a first magnetic column, a second magnetic column and a third magnetic column connected between the first magnetic strip and the second magnetic strip; The first magnetic strip and the second magnetic strip extend in a direction perpendicular to the thickness direction of the ceramic substrate, the first magnetic strip and the second magnetic strip are spaced apart in the thickness direction of the ceramic substrate, and the first magnetic strip is connected to the ceramic substrate; The third magnetic column is located between the first magnetic column and the second magnetic column. A part of the power distribution winding is wound on the first magnetic column as a power matching winding, and another part is wound on the second magnetic column as an impedance matching winding, forming two magnetic circuits.

3. The power divider according to claim 2, characterized in that: The first magnetic column is perpendicular to the first magnetic stripe, the first magnetic column is perpendicular to the second magnetic stripe, and the first magnetic column, the second magnetic column and the third magnetic column are parallel to each other.

4. The power divider according to claim 3, characterized in that: The maximum dimensions of the magnetic core are: length 2.48 mm, height 1.9 mm, width 1.0 mm; And / or, the first magnetic strip is glued to the ceramic matrix.

5. The power divider according to any one of claims 2 to 4, characterized in that: The power distribution winding includes a first coil, a second coil and a third coil wound on the first magnetic column, and a fourth coil and a fifth coil wound on the second magnetic column; The input end of the first coil is connected to the input end electrode, the output end of the first coil and the input end of the second coil form a first common terminal, the output end of the second coil is connected to the input end of the third coil, and the output end of the third coil is connected to the ground end electrode to form the power matching winding; The input end of the fourth coil and the input end of the fifth coil form a second common end, the second common end is connected to the first common end, the output end of the fourth coil is connected to the first output end electrode; the output end of the fifth coil is connected to the second output end electrode to form the impedance matching winding.

6. The power divider according to any one of claims 1 to 4, characterized in that: The impedance capacitor includes a first electrode portion and a second electrode portion, wherein the first electrode portion and the second electrode portion are disposed on two opposite outer surfaces of the ceramic substrate in a thickness direction, and one of the first electrode portion and the second electrode portion is connected to the ground electrode.

7. The power divider according to claim 6, characterized in that: The capacitor also includes a third electrode portion arranged on the side surface of the ceramic substrate, the third electrode portion is located between the first electrode portion and the second electrode portion, the third electrode portion is connected to the second electrode portion on one side in the thickness direction of the ceramic substrate, and is spaced apart from the first electrode portion on the other side.

8. The power divider according to claim 7, characterized in that: A first auxiliary electrode is further provided on the outer surface of the ceramic substrate. The first auxiliary electrode, the second electrode portion and the ceramic substrate are located on the same side of the ceramic substrate in the thickness direction. The first auxiliary electrode is connected between the second electrode portion and the ground electrode.

9. The power divider according to claim 6, characterized in that: The outer surface of the ceramic substrate is also provided with a reserved end electrode and a second auxiliary electrode located on the same side as the magnetic core. The reserved end electrode, the second auxiliary electrode and the first electrode portion are located on the same side of the ceramic substrate in the thickness direction, and the reserved end electrode is connected to the first electrode portion through the second auxiliary electrode.

10. The power divider according to claim 1, characterized in that: The input electrode includes two first electrode conductive parts and a conductive through hole connected between the two first electrode conductive parts. The two first electrode conductive parts are arranged on the outer surfaces of the ceramic substrate on both sides opposite to each other in the thickness direction. The conductive through hole penetrates the ceramic substrate along the thickness direction of the ceramic substrate.

11. The power divider according to claim 10, characterized in that: The input electrode also includes a second electrode conductive portion arranged on the side surface of the ceramic substrate, the second electrode conductive portion is located between two second electrode conductive portions, the second electrode conductive portion is connected to one of the first electrode conductive portions on one side in the thickness direction of the ceramic substrate, and is spaced apart from the other first electrode conductive portion on the other side.

12. The power divider according to any one of claims 1 to 4, 7 to 11, characterized in that: The ceramic matrix is ​​a cubic structure with a side length of 3.81 mm and a thickness of 0.65 mm.

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