Embedded resistance LTCC wilkinson power divider

Abstract

The utility model discloses a resistance internal embedding formula LTCC wilkinson power divider adopts wilkinson structure, including LTCC raw porcelain tape subassembly, input port, two output ports, ground terminal, isolation resistance, inductance subassembly and capacitor subassembly, the input port, two output ports and ground terminal all set up in the surface of LTCC raw porcelain tape subassembly, the isolation resistance is internally buried in the inside of LTCC raw porcelain tape subassembly, and both ends are connected with two output ports respectively, the inductance subassembly adopts multilayer winding structure, and realizes the electric connection between different layers through first through -hole, the capacitor subassembly adopts parallel plate condenser structure, and realizes the electric connection between different layers parallel plate through second through -hole, the utility model discloses an integrated design through isolation resistance internal embedding, multilayer winding structure's inductance and parallel plate condenser structure, has realized the miniaturization and high reliability of power divider, can be widely applied in wireless communication, radar and other radio frequency system.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency power distribution device technology, and in particular to a resistor-embedded LTCC Wilkinson power divider. Background Technology

[0002] In radio frequency (RF) systems such as wireless communication, power dividers, as core power distribution devices, must evenly distribute the power of one input RF signal to multiple output terminals while ensuring the amplitude and phase consistency of the output signals. Traditional power dividers are mostly assembled from discrete components, which has the following drawbacks: First, the layout of discrete components occupies a lot of space, resulting in a large overall size of the power divider, making it difficult to adapt to the installation requirements of miniaturized RF equipment; second, to achieve isolation between output ports, external isolation resistors are required at the output terminals. These external resistors not only further increase the overall size of the product and circuit but also increase soldering joints, leading to reduced reliability of the components in harsh environments and making them prone to problems such as poor contact and increased signal loss.

[0003] Low-temperature co-fired ceramic (LTCC) technology, with its advantages of multilayer integration, miniaturization, and high reliability, has been widely used in the field of radio frequency devices. Although existing LTCC-based power dividers have achieved integration to a certain extent, some key components are still surface-mounted or led out to the surface, failing to fully utilize the space advantages of the LTCC multilayer structure and limiting the miniaturization effect. At the same time, the layout of components such as inductors and capacitors mostly adopts a planar structure, occupying a large area of ​​the green ceramic tape surface, further restricting the reduction of power divider size.

[0004] Therefore, how to provide a miniaturized, stable resistor-embedded LTCC Wilkinson power divider is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides an embedded resistor LTCC Wilkinson power divider to solve the above-mentioned technical problems.

[0006] To solve the above-mentioned technical problems, this utility model provides an LTCC Wilkinson power divider with embedded resistor, which adopts a Wilkinson structure and includes an LTCC green ceramic tape assembly, an input port, two output ports, a grounding terminal, an isolation resistor, an inductor assembly, and a capacitor assembly.

[0007] The input port, two output ports, and grounding terminal are all located on the surface of the LTCC green ceramic tape assembly.

[0008] The isolation resistor is embedded inside the LTCC green ceramic tape assembly, and its two ends are electrically connected to the two output ports respectively.

[0009] The inductor assembly adopts a multi-layer winding structure, and the electrical connection between different layers is achieved through the first through hole;

[0010] The capacitor assembly adopts a parallel plate capacitor structure, and the electrical connection between different layers of parallel plates is realized through the second through hole.

[0011] Preferably, the LTCC green ceramic tape assembly comprises at least 8 layers of green ceramic tape.

[0012] Preferably, the inductor assembly includes two inductors L1 and L2 with identical structures, both of which are spirally wound using a wire-wound structure.

[0013] Preferably, the inductor L1 is composed of microstrip lines L11 and L12 located in different layers of green ceramic tape and a first through hole V11. The microstrip lines L11 and L12 are electrically connected through the first through hole V11 to form a spirally wound inductor structure.

[0014] Preferably, the capacitor assembly includes four identical capacitors C1, C2, C3 and C4.

[0015] Preferably, the capacitor C4 is composed of a parallel plate C41 located in the 5th green ceramic layer, a parallel plate C42 located in the 6th green ceramic layer, a parallel plate C43 located in the 7th green ceramic layer, and a second through hole V41; the parallel plate C41 and the parallel plate C43 are electrically connected through the second through hole V41, and the parallel plates C41, C42, and C43 are arranged at intervals in sequence to jointly form a parallel plate capacitor structure.

[0016] Preferably, the isolation resistor is disposed in the fourth layer of green ceramic tape of the LTCC green ceramic tape assembly, and the two ends of the isolation resistor are respectively connected to the two output ports through metal conductors.

[0017] Preferably, the resistance of the isolation resistor is 100Ω.

[0018] Preferably, the first layer of green ceramic tape in the LTCC assembly has metal conductors printed on both the front and back sides, and the metal conductors on the front and back sides are electrically connected through a metal layer printed on the side.

[0019] Preferably, the dimensions of the resistor-embedded LTCC Wilkinson power divider are 1.6mm × 0.8mm × 0.35mm.

[0020] Compared with the prior art, the resistor-embedded LTCC Wilkinson power divider provided by this utility model has the following advantages:

[0021] 1. This utility model fully utilizes the advantages of 3D integration of LTCC technology by embedding the isolation resistor inside the LTCC green ceramic tape assembly and using an inductor assembly with a multi-layer winding structure and a capacitor assembly with a parallel plate capacitor structure. This significantly reduces the area occupied by the device on the plane and better meets the needs of modern wireless communication equipment for miniaturization and high-density packaging.

[0022] 2. In this utility model, the isolation resistor is directly embedded inside the LTCC green ceramic tape, rather than being externally connected or surface-mounted, which reduces the number of solder joints and external connections, thereby reducing the risk of connection failure caused by environmental factors such as vibration and temperature changes.

[0023] 3. This utility model adopts the Wilkinson structure, which ensures good power distribution characteristics and port isolation. The embedded isolation resistor effectively absorbs reflected signals and reduces mutual interference between ports. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the resistor-embedded LTCC Wilkinson power divider in a specific embodiment of this utility model.

[0025] Figures 2 to 9 These are structural diagrams of the first to eighth layers of the resistor-embedded LTCC Wilkinson power divider in a specific embodiment of this utility model.

[0026] Figure 10 The output port S-parameter test curve of the resistor-embedded LTCC Wilkinson power divider in a specific embodiment of this utility model is shown.

[0027] Figure 11 The input port voltage standing wave ratio of the resistor-embedded LTCC Wilkinson power divider in a specific embodiment of this utility model;

[0028] Figure 12 The phase difference at the output of the resistor-embedded LTCC Wilkinson power divider in a specific embodiment of this utility model is shown.

[0029] In the diagram: T-LTCC green ceramic tape assembly, 10-input port, 20-output port, 30-ground terminal, R-isolation resistor, L1, L2-inductors, C1, C2, C3, C4-capacitors, V1, V2-first through hole, V3, V4-second through hole. Detailed Implementation

[0030] To illustrate the technical solution of the above utility model in more detail, specific embodiments are listed below to demonstrate the technical effects; it should be emphasized that these embodiments are used to illustrate the present utility model and not to limit the scope of the present utility model.

[0031] The resistor-embedded LTCC Wilkinson power divider provided by this utility model, such as Figure 1 As shown, a Wilkinson structure is adopted, including an LTCC green ceramic tape assembly T, an input port 10, two output ports 20, a ground terminal 30, an isolation resistor R, an inductor assembly, and a capacitor assembly, wherein:

[0032] The input port 10, the two output ports 20, and the ground terminal 30 are all located on the surface of the LTCC green ceramic tape assembly T, which facilitates soldering to external radio frequency circuits.

[0033] The isolation resistor R is embedded inside the LTCC green ceramic tape assembly T, and its two ends are electrically connected to the two output ports 20 respectively.

[0034] The inductor assembly adopts a multi-layer winding structure, and the electrical connection between different layers is achieved through the first through hole V1 or V2.

[0035] The capacitor assembly adopts a parallel plate capacitor structure, and the electrical connection between different layers of parallel plates is realized through the second through hole V3 or V4.

[0036] This invention fully utilizes the advantages of LTCC technology's three-dimensional integration by embedding the isolation resistor R inside the LTCC green ceramic tape assembly T and employing a multi-layer wire-wound inductor assembly and a parallel-plate capacitor assembly. This significantly reduces the area occupied by the device on the plane and better meets the needs of modern wireless communication equipment for miniaturization and high-density packaging.

[0037] In some embodiments, please refer to the following: Figures 1 to 9 The LTCC green ceramic tape assembly T comprises at least 8 layers of green ceramic tape. In this embodiment, a glass-ceramic composite material is used. The metal conductor and the isolation resistor R are formed by printing process and then co-fired with the green ceramic tape to achieve integrated design. The 8-layer green ceramic tape design provides three-dimensional space for "embedded resistors and multi-layer inductors / capacitors," avoiding the stacking of components on a planar layer and further reducing the device size.

[0038] In some embodiments, please refer to the following: Figure 2 The first layer of the LTCC green ceramic tape assembly T has metal conductors printed on both the front and back sides, and the metal conductors on the front and back sides are electrically connected through the metal layer printed on the side. The "front and back conductors + side connection" design of the first layer of green ceramic tape reduces the grounding impedance and reduces signal reflection.

[0039] In some embodiments, please refer to the following: Figure 3 and Figure 4The inductor assembly includes two identical inductors, L1 and L2, both of which are spirally wound using a wire-wound structure. Specifically, inductor L1 consists of microstrip lines L11 and L12 located on different layers of green ceramic tape, and a first via V11. Microstrip lines L11 and L12 are electrically connected through the first via V11, forming a spirally wound inductor structure. Compared to planar inductors, this reduces the surface area occupied by 70%, and the interconnection through the first via reduces parasitic inductance and improves signal transmission efficiency.

[0040] In some embodiments, please refer to the following: Figure 5 The isolation resistor R (e.g., 100Ω) is located in the fourth layer of green ceramic tape of the LTCC green ceramic tape assembly T, and the two ends of the isolation resistor R are respectively connected to the two output ports 20 through metal conductors, eliminating the welding joint of the external resistor, improving the isolation of the output port 20, and improving the vibration resistance reliability.

[0041] In some embodiments, please refer to the following: Figures 6 to 9 The capacitor assembly includes four identical capacitors C1, C2, C3, and C4. Specifically, capacitor C4 consists of a parallel plate C41 located on the 5th green ceramic layer, a parallel plate C42 located on the 6th green ceramic layer, a parallel plate C43 located on the 7th green ceramic layer, and a second through hole V41. The parallel plates C41 and C43 are electrically connected through the second through hole V41, and the parallel plates C41, C42, and C43 are arranged alternately to form a parallel plate capacitor structure. The multilayer parallel plate capacitor utilizes the dielectric properties of the green ceramic layer to achieve a large capacitance in a small area, and the capacitance stability is high, meeting the impedance matching requirements of the radio frequency circuit.

[0042] In some embodiments, the resistor-embedded LTCC Wilkinson power divider has a size of 1.6mm × 0.8mm × 0.35mm, which is more than 80% smaller than existing LTCC power dividers (typically ≥ 3mm × 2mm), and can be directly integrated into the micro-module of the 5G mobile phone RF front end.

[0043] The LTCC Wilkinson power divider with embedded resistor provided in this invention was used for simulation testing, and the simulation results are as follows: Figures 10 to 12 As shown in the figure, within the 2.0GHz~2.8GHz band, the amplitude difference between the two output ports is ≤0.11dB, the voltage standing wave ratio of the input port is ≤1.33, and the phase difference between the two output ports is ≤3.1°. The above performance fully meets the requirements of radio frequency systems such as wireless communication and radar.

[0044] In summary, the resistor-embedded LTCC Wilkinson power divider provided by this utility model adopts a Wilkinson structure, including an LTCC green ceramic tape assembly T, an input port 10, two output ports 20, a ground terminal 30, an isolation resistor R, an inductor assembly, and a capacitor assembly. The input port 10, the two output ports 20, and the ground terminal 30 are all disposed on the surface of the LTCC green ceramic tape assembly T. The isolation resistor R is embedded inside the LTCC green ceramic tape assembly T, and its two ends are electrically connected to the two output ports 20 respectively. The inductor assembly adopts a multi-layer winding structure, and the electrical connection between different layers is realized through a first through hole V1 or V2. The capacitor assembly adopts a parallel plate capacitor structure, and the electrical connection between different parallel plates is realized through a second through hole V3 or V4. This invention fully utilizes the advantages of LTCC technology's three-dimensional integration by embedding the isolation resistor R inside the LTCC green ceramic tape assembly T and employing a multi-layer wire-wound inductor assembly and a parallel-plate capacitor assembly. This significantly reduces the area occupied by the device on the plane and better meets the needs of modern wireless communication equipment for miniaturization and high-density packaging.

[0045] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Therefore, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model also intends to include these modifications and variations.

Claims

1. A resistor-embedded LTCC Wilkinson power divider, characterized in that, It adopts Wilkinson structure, including LTCC green ceramic tape assembly, input port, two output ports, ground terminal, isolation resistor, inductor assembly and capacitor assembly; The input port, two output ports, and grounding terminal are all located on the surface of the LTCC green ceramic tape assembly. The isolation resistor is embedded inside the LTCC green ceramic tape assembly, and its two ends are electrically connected to the two output ports respectively. The inductor assembly adopts a multi-layer winding structure, and the electrical connection between different layers is achieved through the first through hole; The capacitor assembly adopts a parallel plate capacitor structure, and the electrical connection between different layers of parallel plates is realized through the second through hole.

2. The resistor-embedded LTCC Wilkinson power divider as described in claim 1, characterized in that, The LTCC green ceramic tape assembly comprises at least 8 layers of green ceramic tape.

3. The resistor-embedded LTCC Wilkinson power divider as described in claim 2, characterized in that, The inductor assembly includes two inductors L1 and L2 with identical structures, both of which are spirally wound using a wire-wound structure.

4. The resistor-embedded LTCC Wilkinson power divider as described in claim 3, characterized in that, The inductor L1 is composed of microstrip lines L11 and L12 located in different layers of green ceramic tape and a first through hole V11. The microstrip lines L11 and L12 are electrically connected through the first through hole V11 to form a spirally wound inductor structure.

5. The resistor-embedded LTCC Wilkinson power divider as described in claim 2, characterized in that, The capacitor assembly includes four identical capacitors C1, C2, C3 and C4.

6. The resistor-embedded LTCC Wilkinson power divider as described in claim 5, characterized in that, The capacitor C4 is composed of a parallel plate C41 located in the 5th layer of green ceramic tape, a parallel plate C42 located in the 6th layer of green ceramic tape, a parallel plate C43 located in the 7th layer of green ceramic tape, and a second through hole V41. The parallel plate C41 and the parallel plate C43 are electrically connected through the second through hole V41, and the parallel plates C41, C42, and C43 are arranged in sequence at intervals to form a parallel plate capacitor structure.

7. The resistor-embedded LTCC Wilkinson power divider as described in claim 2, characterized in that, The isolation resistor is disposed in the fourth layer of green ceramic tape of the LTCC green ceramic tape assembly, and the two ends of the isolation resistor are respectively connected to the two output ports through metal conductors.

8. The resistor-embedded LTCC Wilkinson power divider as described in claim 7, characterized in that, The isolation resistor has a resistance of 100Ω.

9. The resistor-embedded LTCC Wilkinson power divider as described in claim 2, characterized in that, The first layer of the LTCC green ceramic tape assembly has metal conductors printed on both the front and back sides, and the metal conductors on the front and back sides are electrically connected through a metal layer printed on the side.

10. The resistor-embedded LTCC Wilkinson power divider as described in claim 1, characterized in that, The dimensions of the embedded resistor LTCC Wilkinson power divider are 1.6mm × 0.8mm × 0.35mm.

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