Spiral Inductor Layout With Variable Spacing for Higher Q
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Solution Overview
Problem
Miniaturized inductor components for high-frequency signals face challenges in maintaining high inductance and Q values due to reduced wiring cross sections and interference of magnetic fluxes, leading to inefficiencies in characteristic performance.
Innovation Solution
The inductor component design features a spiral coil conductor layer with varying wiring spacings between adjacent wiring portions in different directions, reducing magnetic flux cancellation and enhancing efficiency in obtaining characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of coil conductor layers is increased to increase inductance value, then the inductance value is improved, but the size of the multilayer body is increased in the layering direction
Solution Approach 1:
The patent applies local quality by varying the wiring spacing within the coil conductor layer based on the radial position. The wiring spacing is set to be smaller in the inner region (closer to the center) and larger in the outer region. This local variation optimizes the magnetic flux distribution and reduces cancellation effects, thereby improving inductance value without increasing the overall layering direction size.
Solution Approach 2:
The patent changes the parameter of wiring spacing from a uniform value to a variable value that depends on the radial position within the coil layer. By making the wiring spacing a function of position (smaller internally, larger externally), the design achieves better inductance characteristics within the same physical dimensions, resolving the contradiction between inductance value and component size.
2Quantity of substance
If the number of turns per coil conductor layer is increased to increase inductance value without modifying outward shape, then the inductance value is improved, but the Q value is reduced due to magnetic flux interference
Solution Approach 1:
The patent addresses magnetic flux interference by implementing local quality through position-dependent wiring spacing. By setting smaller wiring spacing in the inner region and larger spacing in the outer region, the design optimizes magnetic flux distribution to reduce cancellation effects. This allows for increased number of turns while maintaining higher Q value, as the varied spacing mitigates the harmful magnetic flux interference that would otherwise occur with uniformly spaced windings.
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
This design improves the efficiency in obtaining inductance and Q values by minimizing magnetic flux interference, thus optimizing performance in a compact form factor.
Implementation Method 1
a coil conductor layer formed into a spiral wound more than one turn on a main surface parallel to the first lateral surface inside the device body. At each pair of the wiring portions adjacent to each other, the magnetic fluxes generated by currents flowing through the wiring portions cancel each other out.
Data Source
AI summary
An inductor component includes a substantially rectangular parallelepiped device body including a first lateral surface and includes a coil conductor layer formed into a spiral wound more than one turn on a main surface parallel to the first lateral surface inside the device body. In the coil conductor layer, a wiring spacing between two wiring portions adjacent to each other (straight portions) in a first direction from an inner side portion to an outer side portion of the coil conductor layer differs from a wiring spacing of two wiring portions adjacent to each other (curved portions) in a second direction from the inner side portion to the outer side portion of the coil conductor layer, the second direction differing from the first direction.