Filter inductor applied to 5g communication signal transmission

Abstract

The utility model relates to the field of filter inductance, concretely relates to the filter inductance for 5G communication signal transmission, include: base, annular core, set up on the base and annular core's axis parallel to base plane, annular core and base between through epoxy resin glue fixed connection, coil winding, have three, every coil winding is wound on annular core and its positive and negative pole all downward in proper order through epoxy resin glue and base, the epoxy resin glue includes the first glue area for fixing the connecting position between annular core and base and the second glue area for fixing the positive and negative pole of coil winding through the base position. Through double glue area fixed structure, accurate parameter control and wide temperature design, solve 5G filter inductance high frequency loss, structural reliability is insufficient and high temperature parameter drift problem.

Description

Technical Field

[0001] This utility model relates to the field of filter inductors, specifically to filter inductors used in 5G communication signal transmission. Background Technology

[0002] With the rapid development of 5G communication technology, communication equipment places higher demands on the bandwidth, speed, and stability of signal transmission. As a key component in signal processing, filter inductors need to maintain low loss and high stability under high-frequency operating conditions and withstand the high-temperature conditions of complex environments such as base stations and data centers. While current mainstream filter inductor products can meet basic performance requirements (such as nominal inductance 851.6μH±10%, load inductance 300μH@8A, DCR≤125mΩ), significant technical bottlenecks remain in high-frequency signal filtering stability, multi-winding fixed reliability, and extreme temperature adaptability.

[0003] In high-frequency signal transmission scenarios, the core loss and parasitic winding parameters of traditional inductors can easily lead to deterioration in filtering performance. For example, inductors using a single epoxy resin encapsulation structure in existing technologies typically have a Q value (quality factor) below 60 in the 2.6GHz band of 5G base stations, failing to effectively suppress out-of-band interference. Meanwhile, multi-winding inductors often experience poor contact due to adhesive layer cracking or loose pins. Reliability tests conducted by a communication equipment manufacturer showed that after 1000 temperature cycles (-40℃ to 125℃), the pin detachment failure rate of traditional three-winding inductors reached as high as 3.2%.

[0004] Parameter drift under high-temperature environments is another core challenge. The upper limit of the operating temperature for existing inductor products is mostly 125℃, while the long-term operating temperature of RF modules in 5G base stations can reach over 140℃. According to the material properties data of TDK's N48 series ferrite materials, when the temperature exceeds 125℃, the permeability decreases by more than 15%, causing the inductance deviation to exceed the ±10% design threshold. Furthermore, the epoxy resin adhesive layer of traditional inductors is prone to thermal aging under sustained high temperatures, leading to a decrease in insulation performance. In one product model, the withstand voltage dropped from AC600V to 480V during a 150℃ aging test, posing a safety hazard. Utility Model Content

[0005] To address the aforementioned issues, a filter inductor for 5G communication signal transmission is provided. Through a dual-bonded area fixing structure, precise parameter control, and wide-temperature design, the problems of high high-frequency loss, insufficient structural reliability, and high-temperature parameter drift in 5G filter inductors are solved.

[0006] To address the problems of existing technologies, this utility model provides a filtering inductor for 5G communication signal transmission, comprising: a base; a toroidal iron core disposed on the base with its axis parallel to the plane of the base; the toroidal iron core and the base being fixedly connected by epoxy resin adhesive; and three coil windings, each coil winding being wound around the toroidal iron core with its positive and negative terminals passing downwards through the epoxy resin adhesive and the base; the epoxy resin adhesive includes a first adhesive area for fixing the connection position between the toroidal iron core and the base, and a second adhesive area for fixing the position where the positive and negative terminals of the coil winding pass through the base.

[0007] Preferably, the nominal inductance of the filter inductor is 851.6 μH.

[0008] Preferably, the load inductance of the filter inductor is such that, under an 8A current, the inductance drops to a minimum limit of 300μH.

[0009] Preferably, the maximum DC resistance of the filter inductor is 125mΩ.

[0010] Preferably, the operating temperature range of the filter inductor is -40°C to 155°C.

[0011] Compared with the prior art, the advantages of this utility model are: through innovative structural design and material optimization, the stability of the filter inductor in high-frequency signal transmission, the structural reliability in complex environments, and the performance consistency under wide temperature conditions are comprehensively improved, effectively meeting the stringent requirements of 5G communication equipment for key components. Attached Figure Description

[0012] Figure 1 This utility model relates to a three-dimensional filter inductor for 5G communication signal transmission. Figure 1 .

[0013] Figure 2 This utility model relates to a three-dimensional filter inductor for 5G communication signal transmission. Figure 2 .

[0014] Figure 3 This is a schematic diagram of the three-dimensional exploded structure of the filter inductor used in 5G communication signal transmission according to this utility model. Figure 1 .

[0015] Figure 4 This is a schematic diagram of the three-dimensional exploded structure of the filter inductor used in 5G communication signal transmission according to this utility model. Figure 2 .

[0016] The diagram is labeled as follows: 1. Base; 2. Toroidal core; 3. Coil winding; 4. Epoxy resin adhesive; 41. First adhesive area; 42. Second adhesive area. Detailed Implementation

[0017] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0018] See Figures 1-4 The filter inductor shown is used for 5G communication signal transmission and includes: a base 1, a toroidal core 2, which is mounted on the base 1 and whose axis is parallel to the plane of the base 1. The toroidal core 2 and the base 1 are fixedly connected by epoxy resin adhesive 4; and three coil windings 3, each coil winding 3 is wound on the toroidal core 2 and its positive and negative poles pass downward through the epoxy resin adhesive 4 and the base 1 in sequence. The epoxy resin adhesive 4 includes a first adhesive area 41 for fixing the connection position between the toroidal core 2 and the base 1 and a second adhesive area 42 for fixing the position where the positive and negative poles of the coil winding 3 pass through the base 1.

[0019] The nominal inductance of this filter inductor is 851.6 μH. The load inductance of this filter inductor drops to a minimum of 300 μH at 8A current. The maximum DC resistance of this filter inductor is 125 mΩ. The operating temperature range of this filter inductor is -40℃ to 155℃.

[0020] The performance parameters of the filter inductor of this invention are as follows: Inductance (L): The nominal inductance is 851.6μH, with a tolerance range of ±10%, and the reference value is 874.3μH.

[0021] Load inductance (L Load): At 8A current, the inductance drops to a minimum limit of 300μH, with a reference value of 347μH.

[0022] Product Q value: 80 MIN, reference value is 245.

[0023] DC resistance (DCR): The maximum DC resistance is 125mΩ, and the reference value is 108.3mΩ.

[0024] Product withstand voltage (Hi-pot test): AC600V / 1m A / 3S, test passed.

[0025] Interlayer insulation: 2.2KV / AC / area <8%, area difference <35%, test qualified.

[0026] Inductor turns (TURNS); 42TS (reference).

[0027] Operating temperature (Ope.Temp): The operating temperature range is -40℃ to 125℃. Under operating conditions, the product temperature (ambient temperature + temperature rise) should not exceed 125℃.

[0028] Product weight: 78.8g / PCS.

[0029] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A filter inductor used in 5G communication signal transmission, characterized in that, include: Base (1), A ring-shaped iron core (2) is set on a base (1) and the axis of the ring-shaped iron core (2) is parallel to the plane of the base (1). The ring-shaped iron core (2) and the base (1) are fixedly connected by epoxy resin glue (4). The coil winding (3) has three coil windings, each coil winding (3) is wound on the toroidal iron core (2) and its positive and negative poles pass downward through the epoxy resin glue (4) and the base (1) in sequence. The epoxy resin adhesive (4) includes a first adhesive area (41) for fixing the connection position between the annular iron core (2) and the base (1) and a second adhesive area (42) for fixing the positive and negative poles of the coil winding (3) passing through the base (1).

2. The filter inductor for 5G communication signal transmission according to claim 1, characterized in that, The nominal inductance of this filter inductor is 851.6 μH.

3. The filter inductor for 5G communication signal transmission according to claim 1, characterized in that, The load inductance of this filter inductor is: at an 8A current, the inductance drops to a minimum limit of 300μH.

4. The filter inductor for 5G communication signal transmission according to claim 1, characterized in that, The maximum DC resistance of this filter inductor is 125mΩ.

5. The filter inductor for 5G communication signal transmission according to claim 1, characterized in that, The operating temperature range of this filter inductor is -40℃ to 155℃.

Images