Laminate Inductor Corner Capture Pad for RF Isolation
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Solution Overview
Problem
In mobile RF transceivers, the integration of laminate inductors in RF front-end modules faces challenges due to space constraints, leading to increased size and isolation issues between inductors and RF traces, which affects carrier aggregation performance and results in high insertion losses and grounding complexities.
Innovation Solution
The design incorporates a laminate substrate inductor with a spiral trace and a capture pad positioned at its corner, where the capture pad is within the bounding box of the spiral trace, maintaining a constant ground clearance to reduce isolation and space constraints, allowing for high-density inductor integration and improved isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the capture pad is extended beyond the spiral trace to facilitate connection, then the ease of manufacture is improved, but the area occupied by the inductor increases and isolation from ground becomes problematic
Solution Approach 1:
The capture pad is nested within the bounding box of the spiral trace, with the spiral trace wrapping around the capture pad. This nesting arrangement allows the capture pad to be positioned at the corner of the spiral trace while remaining within the overall footprint, facilitating connection without increasing the inductor area beyond the spiral trace boundaries.
Solution Approach 2:
The solution moves the capture pad into the vertical plane by having the spiral trace wrap around it in three-dimensional space. This dimensional approach allows the capture pad to extend beyond the planar projection of the spiral trace while maintaining constant ground clearance, effectively utilizing the Z-dimension to resolve the area constraint.
2Reliability
If multiple inductors are integrated to compensate for high capacitor capacitance, then the electrical performance is improved, but the device complexity and space requirements increase
Solution Approach 1:
The capture pad and spiral trace are merged into a single integrated structure where the capture pad forms part of the inductor assembly. This merging eliminates the need for separate connection elements and reduces the overall complexity of integrating multiple inductors into the laminate substrate.
3Ease of operation
If the capture pad is positioned outside the spiral trace bounding box to improve connection access, then the ease of operation is improved, but the isolation from ground is compromised and insertion loss increases
Solution Approach 1:
The spiral trace is configured to wrap around the capture pad with varying proximity at different locations. The trace maintains appropriate spacing from ground in critical areas while providing close access to the capture pad at connection points, creating local variations in trace geometry that optimize both isolation and connection access.
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 configuration enables reduced insertion loss and enhanced isolation between inductors and RF traces, facilitating high-density inductor integration and supporting multiple-band carrier aggregation by maintaining consistent inductance and quality factor.
Implementation Method 1
it takes a lot of area or volume to generate magnetic wave or flux, which generates the inductance value
Data Source
AI summary
A laminate substrate inductor reduces insertion loss and improves isolation while reducing the area for integrating the laminate substrate inductor. The laminate substrate includes a spiral trace. The laminate substrate also includes a first capture pad at a first end of the spiral trace. The first end is located at a corner of the spiral trace. The first capture pad is substantially within a bounding box of the spiral trace. At least a portion of the first capture pad and an outer edge of the spiral trace have a same distance from a ground.