Multilayer Coil Component with Dielectric Gradient for 50 GHz RF
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Solution Overview
Problem
Existing multilayer coil components do not exhibit satisfactory radio-frequency characteristics at frequencies greater than or equal to 50 GHz, which is a challenge due to the increasing communication speed and miniaturization of electronic devices.
Innovation Solution
A multilayer coil component is designed with a low-dielectric-constant portion in the center and high-dielectric-constant portions at both ends, featuring a coil structure with a specific arrangement of insulating layers and outer electrodes to reduce stray capacitance and enhance radio-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil component uses a uniform dielectric constant structure, then the manufacturing process is simple, but the radio-frequency characteristics are not satisfactory in frequency bands greater than or equal to 50 GHz
Solution Approach 1:
The patent applies local quality by dividing the insulating layers into different regions with different dielectric constants. Specifically, a first insulating layer with a first dielectric constant and a second insulating layer with a second dielectric constant are used in different portions of the coil structure. This allows optimization of radio-frequency characteristics in specific regions while maintaining overall structural integrity, thereby resolving the contradiction between performance and complexity.
2Reliability
If the number of stacked coil conductors is increased to improve inductance, then the inductance value increases, but the stray capacitance increases leading to degraded high-frequency performance
Solution Approach 1:
The patent changes the dielectric constant parameter of the insulating layers to optimize high-frequency performance. By using insulating layers with different dielectric constants in different regions, the patent controls stray capacitance while maintaining the necessary inductance value. This parameter change approach allows achieving good high-frequency characteristics without simply increasing the number of coil conductors.
3Reliability
If the coil length is increased to reduce resistance, then the resistance decreases, but the component size increases which contradicts miniaturization requirements
Solution Approach 1:
The patent uses composite material structure by combining insulating layers with different dielectric constants. This composite approach allows optimizing the electrical characteristics (resistance and inductance) within a compact size. The different dielectric constant regions enable better control of electromagnetic field distribution, achieving low resistance without proportionally increasing the physical dimensions of the component.
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 configuration results in improved radio-frequency characteristics, particularly in high-frequency bands from 30 GHz to 80 GHz, with reduced stray capacitance and suitable transmission coefficients, making it suitable for use in bias-tee circuits within optical communication circuits.
Implementation Method 1
The multilayer body includes a low-dielectric-constant portion, which is centrally arranged in the stacking direction and has a comparatively low relative dielectric constant, and high-dielectric-constant portions, which are arranged at both ends in the stacking direction and have a comparatively high dielectric constant.
Data Source
AI summary
A multilayer coil component includes a multilayer body formed by stacking a plurality of insulating layers in a length direction and that has a built-in coil, and a first outer electrode and a second outer electrode that are electrically connected to the coil. The coil is formed by a plurality of coil conductors stacked in the length direction being electrically connected to each other. The first and second outer electrodes respectively cover parts of first and second end surfaces and parts of a first main surface. The multilayer body includes a low-dielectric-constant portion, which is centrally arranged, and high-dielectric-constant portions, which are arranged at both ends in the stacking direction. The length of a region in which the coil conductors are arranged in the stacking direction lies in a range from 85% to 90% of a length of the multilayer body.