Multilayer Coil Component Parallel Axis RF Performance
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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 60 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 coil built into a multilayer body formed by stacking insulating layers and coil conductors, where the coil conductors are electrically connected and the outer electrodes are strategically positioned to cover specific surfaces, optimizing the coil's orientation and configuration to enhance radio-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil component is designed with conventional stacking configuration, then the structure is simple and easy to manufacture, but the radio-frequency characteristics are not satisfactory at frequencies greater than or equal to 60 GHz
Solution Approach 1:
The patent applies dimensionality change by transitioning from a conventional configuration where the coil axis is perpendicular to the mounting surface to a configuration where the coil axis is parallel to the mounting surface. This spatial reorientation in a different dimension enables excellent radio-frequency characteristics at 60 GHz and higher frequencies while maintaining manufacturability through standard multilayer stacking processes.
Solution Approach 2:
The patent employs parameter changes by optimizing specific geometric parameters including setting the length of the coil conductor region to 85-95% of the multilayer body length, limiting the sum of stacked coil conductors facing outer electrodes to 12 or fewer, and positioning outer electrodes to cover specific surfaces. These parameter optimizations achieve superior radio-frequency performance without significantly increasing device complexity.
2Reliability
If the coil axis is perpendicular to the mounting surface, then the manufacturing process is conventional and simple, but the transmission coefficient at 60 GHz is insufficient
Solution Approach 1:
The patent reorients the coil axis from perpendicular to parallel with the mounting surface, utilizing a different spatial dimension to achieve excellent transmission coefficients (S21 ≥ -3 dB at 60 GHz). This dimensional change is integrated into conventional multilayer stacking manufacturing processes, maintaining ease of manufacture while dramatically improving high-frequency performance.
3Reliability
If more coil conductors are stacked to increase inductance, then the inductance value increases, but the radio-frequency characteristics deteriorate due to increased parasitic capacitance
Solution Approach 1:
The patent optimizes the parameter of stacked coil conductors by limiting their sum to 12 or fewer when facing outer electrodes. This parameter control reduces parasitic capacitance effects while maintaining necessary inductance values, achieving excellent radio-frequency characteristics at 60 GHz and higher frequencies without excessive device complexity.
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 first and second outer electrodes 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 length of a region in which the coil conductors are arranged in the stacking direction lies in a range from 85% to 95% of the length of the multilayer body. The sum of the numbers of stacked coil conductors that face the parts of the first and second outer electrodes extending along the first main surface is less than or equal to twelve.