Miniaturized ultra-wideband strip line power divider

Abstract

The utility model discloses a miniaturized ultra-wideband strip line power divider, which comprises a main body and a strip line power divider arranged in the main body, the stripline power divider comprises a stripline input port and two groups of output branches connected with the stripline input port, each group of output branches comprises a first-order impedance conversion stripline connected with the stripline input port, a second-order impedance conversion stripline connected with the first-order impedance conversion stripline, and a third-order impedance conversion stripline connected with the second-order impedance conversion stripline connected with the second-order impedance conversion stripline. The strip line output port is connected with the second-order impedance conversion strip line; the main body consists of a plurality of groups of plate bodies, and an upper metal layer and a lower metal layer are respectively arranged on the upper surface and the lower surface of each group of plate bodies; the upper metal layer of the top layer plate body is provided with a coplanar waveguide input port and two groups of coplanar waveguide output ports; and the coplanar waveguide input port and the two groups of coplanar waveguide output ports are respectively connected with the strip line input port and the two groups of strip line output ports through similar axes.

Description

Technical Field

[0001] The utility model relates to the field of radio frequency devices, and specifically to a miniaturized ultra-wideband stripline power divider. Background Art

[0002] The technological progress in the field of wireless communication has imposed higher requirements on radio frequency design. Compared with two-dimensional interconnection, the packaging form of three-dimensional interconnection has higher integration and smaller volume. With the increasingly wide application of three-dimensional interconnection technology in the radio frequency field, as an important and commonly used device in the radio frequency system, the power divider must also meet the structural requirements of three-dimensional interconnection.

[0003] As a radio frequency device that distributes power proportionally into two or more paths, the power divider has various forms such as microstrip power dividers and stripline power dividers. The stripline power divider has the characteristics of high port isolation, good amplitude-phase consistency, small dispersion, low loss, and can withstand large power. Moreover, the stripline power divider does not need to occupy the surface circuit and has no requirement for the cavity height of the radio frequency system, so it can make the structure of the radio frequency system more compact. However, the stripline power divider cannot be directly interconnected with the surface circuit, and its use is not as convenient as that of the microstrip power divider.

[0004] Therefore, there is a need for a new power divider configuration to solve the problem of the use of stripline power dividers in three-dimensional interconnection structures. Summary of the Utility Model

[0005] Purpose of the Utility Model: To provide a miniaturized ultra-wideband stripline power divider to solve the above problems existing in the prior art.

[0006] Technical Solution: A miniaturized ultra-wideband stripline power divider, comprising:

[0007] A main body, and a stripline power divider arranged in the main body;

[0008] The stripline power divider includes a stripline input port, and two groups of output branches connected to the stripline input port. Each group of output branches includes a first-order impedance transformation stripline connected to the stripline input port, a second-order impedance transformation stripline connected to the first-order impedance transformation stripline, and a stripline output port connected to the second-order impedance transformation stripline;

[0009] Isolation resistors are provided between the first-order impedance transformation striplines and between the second-order impedance transformation striplines of the two groups of output branches;

[0010] Both isolation resistors are printed square resistors, and are respectively connected to the first-order 1 / 4 wavelength impedance transformation stripline and the second-order 1 / 4 wavelength impedance transformation stripline.

[0011] The lengths of the first-order impedance transformation stripline and the second-order impedance transformation stripline are both one-quarter wavelength of the operating frequency;

[0012] The impedance of the first-order 1 / 4 wavelength impedance transformation stripline is 82 ohms, and the impedance of the second-order 1 / 4 wavelength impedance transformation stripline is 61 ohms. The lengths of both are one-quarter wavelength of the operating frequency;

[0013] The resistance value of the isolation resistor connected to the first-order 1 / 4 wavelength impedance transformation stripline is 98 ohms, and the resistance value of the isolation resistor connected to the second-order 1 / 4 wavelength impedance transformation stripline is 231 ohms. The isolation resistor effectively absorbs the reflected signals at the output port, reduces the signal interference between the output ports, and improves the isolation degree between the ports.

[0014] The main body is composed of multiple groups of plates, and upper metal layers and lower metal layers are respectively provided on the upper and lower surfaces of each plate. Seven groups of plates are designed;

[0015] Taking the upper metal layer on the top layer plate as the first metal layer and the lower metal layer as the second metal layer, and so on, there are a total of fourteen metal layers;

[0016] The reference ground of the stripline power divider is the second metal layer and the fourteenth metal layer. The reference ground can be connected using metallized vias and metal via shafts.

[0017] The plate is formed by laminating a microwave board and a PP material. The thickness of a single-layer microwave board CLTE-XT is 0.254 mm, the thickness of a single-layer PP is 0.1 mm, and the overall thickness of the main body is 2.7 mm.

[0018] A coplanar waveguide input port and two groups of coplanar waveguide output ports are provided on the upper metal layer of the top layer microwave board;

[0019] The coaxial-like is perpendicular to the plane where the stripline is located. The coplanar waveguide input port and the two groups of coplanar waveguide output ports are respectively connected to the stripline input port and the two groups of stripline output ports through the coaxial-like.

[0020] The present utility model adopts a three-dimensional transition structure of stripline - coaxial-like - coplanar waveguide. The stripline power divider is connected to the coplanar waveguide input and output ports through the coaxial-like. Except for the coplanar waveguide circuit, the upper metal layer of the top layer microwave board can be used for the layout of other circuits on the surface layer of the system. Therefore, the surface layer circuit can be directly interconnected with the stripline power divider, improving the integration degree of the system.

[0021] In a further embodiment, a plurality of metallized vias and metallized buried vias are provided on the main body.

[0022] In a further embodiment, a metal via shaft is provided in the metallized via, and a metal buried via shaft is provided in the metallized buried via.

[0023] In a further embodiment, the metallized vias are disposed around the stripline power divider, the coplanar waveguide input port, and the coplanar waveguide output port;

[0024] The metallized buried vias are disposed around the quasi-coaxial structure.

[0025] The metallized vias, the metallized buried vias, the metal via shafts, and the metal buried via shafts can be selected according to actual requirements;

[0026] Among them, the metallized vias can connect the ground loops of Metal Layer 1 to Metal Layer 14, and the connection is completed through the metal via shafts. They are disposed around the stripline power divider and the coplanar waveguide. The metallized buried vias connect the ground loops of Metal Layer 1 to Metal Layer 2, and the connection is completed through the metal buried via shafts and they are disposed around three quasi-coaxial structures.

[0027] The metallized vias and the metallized buried vias effectively prevent signal leakage and improve the overall performance, and can connect the circuits of corresponding layers according to actual requirements.

[0028] In a further embodiment, the stripline power divider is disposed on the lower metal layer of the fourth group of boards from the top layer to the bottom layer among the seven groups of boards, that is, the eighth metal layer.

[0029] Beneficial effects: The present utility model discloses a miniaturized ultra-wideband stripline power divider. The present utility model adopts a three-dimensional transition structure of stripline - quasi-coaxial - coplanar waveguide. The stripline power divider is connected to the input and output ports of the coplanar waveguide through the quasi-coaxial structure. Except for the coplanar waveguide circuit, the upper metal layer of the top microwave board can be used for the layout of other circuits on the surface layer of the system. Therefore, the surface layer circuit can be directly interconnected with the stripline power divider, improving the integration degree of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the present utility model.

[0031] Figure 2 is an internal structural schematic diagram of the present utility model.

[0032] Figure 3 is a schematic structural diagram of the stripline power divider of the present utility model.

[0033] Figure 4 is a schematic diagram of the main structure of the present utility model.

[0034] Reference numerals are:

[0035] 1, main body; 11, microwave board; 12, upper metal layer; 13, lower metal layer;

[0036] 21, metallized buried via; 22, metal buried via shaft; 31, metallized via; 32, metal via shaft;

[0037] 4. Stripline power divider; 41. Stripline input port; 42. First-order 1 / 4 wavelength impedance transformation stripline; 43. Second-order 1 / 4 wavelength impedance transformation stripline; 44. Stripline output port; 45. Isolation resistor

[0038] 51. Coplanar waveguide input port; 52. Quasi-coaxial; 53. Coplanar waveguide output port Detailed implementation mode

[0039] This application relates to a miniaturized ultra-wideband stripline power divider, which will be explained in detail below through specific implementation modes

[0040] A miniaturized ultra-wideband stripline power divider includes:

[0041] A main body 1, and a stripline power divider 4 arranged in the main body 1

[0042] The stripline power divider 4 includes a stripline input port 41, and two groups of output branches connected to the stripline input port 41. Each group of output branches includes a first-order impedance transformation stripline connected to the stripline input port 41, a second-order impedance transformation stripline connected to the first-order impedance transformation stripline, and a stripline output port 44 connected to the second-order impedance transformation stripline

[0043] Isolation resistors 45 are arranged between the first-order impedance transformation striplines and between the second-order impedance transformation striplines of the two groups of output branches

[0044] Both of the two isolation resistors 45 are printed sheet resistances, and are respectively connected to the first-order 1 / 4 wavelength impedance transformation stripline 42 and the second-order 1 / 4 wavelength impedance transformation stripline 43

[0045] The lengths of the first-order impedance transformation stripline and the second-order impedance transformation stripline are both one-quarter wavelength of the operating frequency

[0046] The impedance of the first-order 1 / 4 wavelength impedance transformation stripline 42 is 82 ohms, and the impedance of the second-order 1 / 4 wavelength impedance transformation stripline 43 is 61 ohms. Their lengths are both one-quarter wavelength of the operating frequency

[0047] The resistance value of the isolation resistor 45 connected to the first-order 1 / 4 wavelength impedance transformation stripline 42 is 98 ohms, and the resistance value of the isolation resistor 45 connected to the second-order 1 / 4 wavelength impedance transformation stripline 43 is 231 ohms. The isolation resistor 45 effectively absorbs the reflected signals at the output ports, reduces the signal interference between the output ports, and improves the isolation degree between the ports

[0048] The main body 1 is composed of multiple groups of plate bodies, and upper metal layers 12 and lower metal layers 13 are respectively arranged on the upper and lower surfaces of each plate body. The plate bodies include seven groups;

[0049] Taking the upper metal layer 12 on the top layer plate body as the first metal layer and the lower metal layer 13 as the second metal layer, and so on, there are a total of fourteen metal layers;

[0050] The reference ground of the stripline power divider 4 is the second metal layer and the fourteenth metal layer.

[0051] The plate body is formed by laminating a microwave board 11 and a PP material. The thickness of a single-layer microwave board 11 of CLTE-XT is 0.254 mm, the thickness of a single-layer PP is 0.1 mm, and the overall thickness of the main body 1 is 2.7 mm.

[0052] A coplanar waveguide input port 51 and two groups of coplanar waveguide output ports 53 are arranged on the upper metal layer 12 of the top layer microwave board 11;

[0053] The quasi-coaxial 52 is perpendicular to the plane where the stripline is located. The coplanar waveguide input port 51 and the two groups of coplanar waveguide output ports 53 are respectively connected to the stripline input port 41 and the two groups of stripline output ports 44 through the quasi-coaxial 52.

[0054] The utility model adopts a three-dimensional transition structure of stripline - quasi-coaxial 52 - coplanar waveguide. The stripline power divider is connected to the input and output ports of the coplanar waveguide through the quasi-coaxial 52. Except for the coplanar waveguide circuit, the upper metal layer 12 of the top layer microwave board 11 can be used for the layout of other circuits on the surface layer of the system. Therefore, the surface layer circuit can be directly interconnected with the stripline power divider 4, improving the integration degree of the system.

[0055] A plurality of metallized through holes 31 and metallized buried holes 21 are formed on the main body 1.

[0056] A metal through hole shaft 32 is arranged in the metallized through hole 31, and a metal buried hole shaft 22 is arranged in the metallized buried hole 21.

[0057] The metallized through holes 31 are arranged around the stripline power divider 4, the coplanar waveguide input port 51, and the coplanar waveguide output ports 53;

[0058] The metallized buried holes 21 are arranged around the quasi-coaxial 52.

[0059] The metallized through holes 31, the metallized buried holes 21, the metal through hole shafts 32, and the metal buried hole shafts 22 can be selected according to actual requirements;

[0060] Among them, the metallized vias 31 connect the ground loops of metal layer 1 to metal layer 14, and the connection is completed through the metal via shaft 32. They are arranged around the stripline power divider 4 and the coplanar waveguide. The metallized buried vias 21 connect the ground loops of metal layer 1 to metal layer 2, and the connection is completed through the metal buried via shaft 22. They are arranged around three coaxial-like structures 52.

[0061] The metallized vias 31 and the metallized buried vias 21 effectively prevent signal leakage and improve the overall performance.

[0062] The stripline power divider 4 is arranged on the lower metal layer 13 of the fourth group of boards from the top layer to the bottom layer among the seven groups of boards, that is, the eighth metal layer.

[0063] Principle description: The present utility model adopts a three-dimensional transition structure of stripline - coaxial-like 52 - coplanar waveguide. The stripline power divider is connected to the input and output ports of the coplanar waveguide input stage through the coaxial-like 52. The upper metal layer 12 of the top microwave board 11 can be used for the layout of other circuits of the system surface circuit except for the coplanar waveguide circuit. Therefore, the surface circuit can be directly interconnected with the stripline power divider 4, improving the integration of the system.

[0064] The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the specific details in the above embodiments. Within the technical concept of the present utility model, various equivalent transformations can be made to the technical solutions of the present utility model, and these equivalent transformations all fall within the protection scope of the present utility model.

Claims

1. A miniaturized ultra-wideband stripline power divider, comprising: a main body (1), and a stripline power divider (4) disposed within the main body (1); wherein the stripline power divider (4) includes a stripline input port (41), and two groups of output branches connected to the stripline input port (41), each group of output branches including a first-order impedance transformation stripline connected to the stripline input port (41), a second-order impedance transformation stripline connected to the first-order impedance transformation stripline, and a stripline output port (44) connected to the second-order impedance transformation stripline; isolation resistors (45) are provided between the first-order impedance transformation striplines and between the second-order impedance transformation striplines of the two groups of output branches; the main body (1) is composed of multiple groups of plates, and an upper metal layer (12) and a lower metal layer (13) are respectively provided on the upper and lower surfaces of each group of plates; a coplanar waveguide input port (51) and two groups of coplanar waveguide output ports (53) are provided on the upper metal layer (12) of the top layer plate; the coplanar waveguide input port (51) and the two groups of coplanar waveguide output ports (53) are respectively connected to the stripline input port (41) and the two groups of stripline output ports (44) through quasi-coaxial (52); 2. A miniaturized ultra-wideband stripline power divider (4) according to claim 1, characterized in that: the plates include seven groups; 3. A miniaturized ultra-wideband stripline power divider (4) according to claim 2, characterized in that: a plurality of metallized vias (31) and metallized buried vias (21) are formed on the main body (1); 4. A miniaturized ultra-wideband stripline power divider (4) according to claim 3, characterized in that: a metal via shaft (32) is provided in the metallized via (31), and a metal buried via shaft (22) is provided in the metallized buried via (21); 5. A miniaturized ultra-wideband stripline power divider (4) according to claim 4, characterized in that: the metallized vias (31) are disposed around the stripline power divider (4) and the coplanar waveguide input port (51), coplanar waveguide output ports (53); the metallized buried vias (21) are disposed around the quasi-coaxial (52); 6. A miniaturized ultra-wideband stripline power divider (4) according to claim 5, characterized in that: the stripline power divider (4) is disposed on the lower metal layer (13) of the fourth group of plates from the top layer to the bottom layer in the plates.

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