RFID IC Antenna Contacts on Multiple Surfaces
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Solution Overview
Problem
The miniaturization of RFID ICs has made the assembly of antenna contacts challenging due to increased alignment and bondwire attachment tolerances, leading to higher costs and complex assembly processes, especially as contact sizes and spacings shrink.
Innovation Solution
Placing antenna contacts on different surfaces of the IC and using antennas and assembly methods that electrically couple the antenna terminals to these surfaces, allowing for simplified and cost-effective assembly by increasing the effective area and natural separation between contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If antenna contacts are placed on a single surface of the IC, then the assembly process becomes more complex and costs increase due to alignment tolerances, but the IC structure remains conventional and compact
Solution Approach 1:
The patent applies dimensionality change by moving antenna contacts from a single surface (2D arrangement) to multiple surfaces of the IC package (3D arrangement). Specifically, first antenna contacts are placed on the front surface while second antenna contacts are placed on the back surface, allowing the antenna to wrap around the IC package. This spatial redistribution simplifies the assembly process by providing larger effective contact areas and more flexible alignment tolerances, while the IC structure itself remains conventional and compact.
2Volume of moving object
If IC size is reduced through miniaturization, then the RFID tag becomes more compact, but alignment and bondwire attachment tolerances become more difficult to achieve
Solution Approach 1:
The patent resolves the miniaturization paradox by transitioning from a planar (2D) contact arrangement to a three-dimensional arrangement utilizing both front and back surfaces of the IC package. This allows the antenna to wrap around the package with contacts distributed across multiple surfaces, effectively increasing the available contact area and providing more degrees of freedom for alignment. Consequently, compact IC sizes can be achieved without compromising manufacturing precision, as the multi-surface configuration naturally accommodates alignment tolerances.
Solution Approach 2:
The patent applies segmentation by dividing the antenna structure into multiple segments that wrap around the IC package, with each segment having its own contacts on different surfaces. This segmentation allows independent optimization of each antenna segment's position and orientation, making it easier to achieve precise alignment even when the overall IC size is reduced. The segmented approach distributes the alignment requirements across multiple locations rather than concentrating them in a single plane.
Data Source
AI summary
Embodiments are directed to a Radio Frequency Identification (RFID) integrated circuit (IC) having a first circuit block electrically coupled to first and second antenna contacts. The first antenna contact is disposed on a first surface of the IC and the second antenna contact is disposed on a second surface of the IC different from the first surface. The first and second antenna contacts are electrically disconnected from each other.