Switchable Patterned Metal Shield Inductance Structure
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Solution Overview
Problem
Wireless communication devices operating across various frequency bands face performance degradation due to energy transfer between inductors and lossy substrates, leading to reduced inductor quality factor and increased phase noise.
Innovation Solution
A switchable patterned metal shield inductance structure is introduced, comprising an inductor and a metal shield with a coupling circuit that adjusts the shield's configuration in response to a control signal, selectively developing eddy currents to reduce overall inductance by different amounts in different modes, thereby isolating the inductor from the substrate and maintaining or improving inductor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shielding is used to isolate the inductor from the lossy substrate, then inductor quality factor is improved, but inductance value is reduced
Solution Approach 1:
The patent applies the dynamics principle by making the shield configuration switchable between different states. The coupling circuit can selectively connect or disconnect portions of the shield structure, allowing the inductor to dynamically adjust its inductance value while maintaining shielding benefits. This resolves the contradiction by enabling the system to operate in different modes: one mode prioritizes quality factor with full shielding, another mode prioritizes inductance value with reduced shielding.
Solution Approach 2:
The patent implements parameter changes by modifying the electrical characteristics of the shield structure through the coupling circuit. By changing the coupling state of the shield portions, the effective inductance parameter of the inductor can be adjusted. This allows the system to change the inductance value parameter while maintaining the shielding function, thus resolving the contradiction between quality factor improvement and inductance value preservation.
2Loss of energy
If the shield structure is configured to reduce energy loss to substrate, then inductor performance is improved, but inductance value decreases
Solution Approach 1:
The patent uses the dynamics principle by implementing a switchable shield configuration that can adapt its shielding strength. The coupling circuit enables dynamic reconfiguration of the shield portions, allowing the system to optimize the balance between energy loss reduction and inductance value maintenance based on operational requirements.
Solution Approach 2:
The patent applies segmentation by dividing the shield structure into multiple portions that can be independently controlled. The coupling circuit can selectively connect or disconnect specific shield segments, allowing partial shielding configurations. This segmentation enables the system to reduce energy loss through strategic shielding while preserving inductance value by leaving certain portions uncoupled.
3Measurement precision
If switchable shield configuration is implemented, then inductance control precision is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the shield into multiple controllable portions with discrete coupling states. This segmentation provides precise inductance control through a limited number of well-defined configurations, avoiding the need for continuous or overly complex control mechanisms. The discrete nature of the segmented shield portions simplifies the control logic while achieving precise inductance adjustment.
Solution Approach 2:
The coupling circuit serves multiple functions: it acts as a switch for the shield configuration, a control element for inductance adjustment, and a means for mode selection. This multi-functionality reduces the need for separate dedicated components for each function, thereby controlling device complexity while achieving precise inductance control through the universal coupling circuit.
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 solution effectively reduces energy loss from the inductor to the substrate, enhancing inductor quality factor and performance by allowing precise control of inductance, thus improving frequency selectivity and reducing phase noise in devices like voltage-controlled oscillators.
Implementation Method 1
A first eddy current may be developed in response to the first magnetic field in the first mode effective to decrease an overall inductance of the variable inductance structure by a first amount
Data Source
AI summary
Technologies are generally described for switchable patterned metal shield inductance structures. In some examples, an inductance structure on a substrate may include an inductor and a metal shield, where the metal shield separates and shields the inductor from the substrate. The configuration of the metal shield and the inductor may facilitate reduction in the overall inductance of the inductance structure. In particular, the metal shield may be configured to develop one or more eddy currents in response to an inductor-generated magnetic field. The eddy currents may then result in a magnetic field opposing the inductor-generated magnetic field, which may result in a reduction in the overall magnetic field and the overall inductance of the inductance structure. The metal shield may be switchable between multiple modes, where each mode may be effective to reduce the overall inductance by a different amount.