Semiconductor Module Antenna Stacking for Radar Bandwidth
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Solution Overview
Problem
Current semiconductor modules with integrated antenna structures have a narrow bandwidth, which is inadequate for motor vehicle radar applications, particularly for FMCW radar systems that require broadband capabilities.
Innovation Solution
The semiconductor module design features antenna structures arranged at different heights, with at least one antenna structure embedded in the housing material and another within the redistribution layer, allowing for vertical spacing and stacking, thereby enhancing bandwidth and directional characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antenna structures are arranged in a single plane within the semiconductor module, then the device complexity is reduced and manufacturing is simplified, but the bandwidth of the antenna is narrow which is inadequate for FMCW radar applications
Solution Approach 1:
The patent transitions from a single-plane (2D) antenna arrangement to a multi-level (3D) stacked configuration. Antenna structures are positioned at different height levels within the semiconductor module, utilizing the vertical dimension to create multiple antenna elements. This dimensional change enables broader bandwidth operation while maintaining integration within the compact module structure.
Solution Approach 2:
The patent implements a nested arrangement where multiple antenna structures are stacked vertically within the housing material. The antenna structures are positioned at different elevation levels, with each antenna nested within the vertical space of the module. This nesting approach maximizes the use of available space while achieving broadband performance through multiple resonant frequencies.
2Adaptability or versatility
If multiple antenna structures are integrated at the same level in the semiconductor module, then the manufacturing process remains simple, but the directional characteristics and bandwidth cannot be adequately adjusted
Solution Approach 1:
By introducing vertical spacing between antenna structures through multi-level stacking, the patent enables independent optimization of directional characteristics for each antenna element. The different height positions allow for tailored beam patterns and radiation patterns without complicating the horizontal manufacturing process.
Solution Approach 2:
Each antenna structure in the stacked configuration can be independently designed and positioned to achieve specific local radiation characteristics. The vertical arrangement allows different antennas to serve different functional requirements (e.g., transmission, reception, different frequency bands) while maintaining a unified manufacturing approach.
Data Source
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AI summary
The invention relates to a semiconductor module having an integrated circuit (18), comprising at least one oscillator (20) for generating a radar signal, a rewiring layer (26) for externally connecting the integrated circuit (18), and at least two antenna structures (14; 16) integrated in the semiconductor module (10) for emitting and/or receiving radar signals. Of the at least two antenna structures (14; 16), at least one is connected to the integrated circuit (18), wherein at least a first one of the antenna structures (14) is imbedded in a housing material of the semiconductor module (10) outside a height area of the rewiring layer (26). The invention further relates to a method for producing such a semiconductor module.