Radar Module Integrated Antenna Package EBG
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Solution Overview
Problem
Integrated radar modules face challenges with signal insertion losses and electromagnetic interference due to the packaging of radio-frequency integrated circuit die, and reducing system size increases complexity while requiring a low-cost solution that minimizes these issues.
Innovation Solution
An integrated antenna package architecture using an interposer with flip-chip stud bump bonding, incorporating RF signal transmission structures and metamaterials like electromagnetic band-gap surfaces to attenuate unwanted modes, and a cap that encapsulates the die and transmission structures without direct encapsulation, facilitating efficient operation at millimeter wave frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If integrated circuit die are packaged at radio frequencies, then radar functionality is achieved, but signal insertion losses occur
Solution Approach 1:
An interposer substrate is introduced as an intermediary component between the radar die and the antenna. The interposer includes a microstrip transmission line that provides a controlled impedance path for RF signals, reducing signal insertion losses compared to direct packaging. The interposer acts as a mediator that maintains signal integrity while enabling the integration of multiple components.
2Reliability
If integrated circuit die are packaged at radio frequencies, then radar functionality is achieved, but electro-magnetic interference occurs
Solution Approach 1:
The harmful electromagnetic modes are extracted and removed from the system by designing the interposer and cap structure to support only the desired fundamental mode. The cap with its specific geometry and the interposer transmission line configuration filter out unwanted higher-order modes and electromagnetic interference, allowing only the fundamental mode to propagate to the antenna.
Solution Approach 2:
The electromagnetic parameters of the packaging structure are optimized to suppress interference. The cap dimensions, interposer transmission line characteristics, and material properties are carefully selected to create a waveguide structure that allows fundamental mode propagation while blocking higher-order modes and interfering electromagnetic signals.
3Volume of moving object
If system size is reduced, then miniaturization is achieved, but system complexity increases
Solution Approach 1:
Multiple components are merged into a single integrated package structure. The radar die, interposer with transmission line, cap with waveguide cavity, and antenna are combined into one compact assembly. This merging reduces the overall system volume while the modular design approach keeps the complexity manageable by integrating components that work together synergistically.
Solution Approach 2:
The packaging structure employs a nested configuration where the radar die is mounted on the interposer, which is then enclosed by the cap, forming a nested arrangement. The antenna is positioned within the cap structure, creating a compact nested layout that minimizes volume while maintaining functional separation of components.
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 reduces signal insertion losses and improves package isolation, enabling efficient simultaneous transmit and receive operations with reduced susceptibility to radar clutter, while maintaining low costs and avoiding frequency shifts or degradation over time.
Implementation Method 1
incorporating RF signal transmission structures and metamaterials like electromagnetic band-gap surfaces to attenuate unwanted modes
Data Source
AI summary
An integrated antenna package includes an interposer, an integrated circuit die, and a cap that forms a cavity within the integrated antenna package. A lossy EBG structure resides at the cap overlying the integrated circuit device. A lossless EBG structure resides at the cap overlying a microstrip feedline. A radar module includes a plurality of receive portions, each receive portion including a parabolic structure having a reflective surface, an absorber structure, a lens, and an antenna.