Miniaturized Inductor with Columnar Core for High-Frequency Impedance
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Solution Overview
Problem
Inductors used in small electronic devices face challenges in achieving high impedance at high frequencies due to size reduction, which affects their inductance and self-resonance frequency, making it difficult to function effectively as inductive elements at higher frequencies.
Innovation Solution
The inductor design includes a core with a columnar shaft and supports, a wire wound around the shaft with specific dimensions and terminal electrodes, optimized to achieve impedance of 500Ω or higher at 3.6 GHz, with a self-resonance frequency of 3.6 GHz or higher, using a magnetic material for the core and a conductive wire with a diameter of 14-20 μm, and strategically positioned terminal electrodes to enhance connection strength and magnetic flux density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
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If the inductor size is reduced to fit small electronic devices, then the inductor can be mounted on compact devices, but the self-resonance frequency decreases and high-frequency impedance performance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the wire diameter (14-20 μm) and the ratio between shaft cross-sectional area and support cross-sectional area (35%-75%). These parameter optimizations enable the miniaturized inductor to achieve both compact size and high self-resonance frequency (3.6 GHz or higher), resolving the contradiction between size reduction and high-frequency performance maintenance
Solution Approach 2:
The patent uses composite material structure combining magnetic material for the core and conductive material for the wire. This composite approach allows the inductor to achieve high inductance in a compact form while maintaining high self-resonance frequency and impedance performance at 3.6 GHz and above
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The inductor achieves desired impedance and inductance values across various frequencies, ensuring effective noise removal, resonance, and impedance matching, while maintaining a compact size, and suppressing parasitic capacitance to maintain high self-resonance frequency.
Implementation Method 1
a wire wound around the shaft and having two end portions connected to the terminal electrodes corresponding thereto on the supports
Implementation Method 2
using a magnetic material for the core
Data Source
AI summary
An inductor includes a core including a columnar shaft and a pair of supports on respective end portions of the shaft, a terminal electrode disposed on each support, and a wire wound around the shaft and having two end portions connected to the terminal electrodes, corresponding to the two end portions, on the supports. In the inductor, an impedance is approximately 500Ω or higher with respect to an input signal having a frequency of approximately 3.6 GHz.