SIW Antenna Direct IC Coupling for Vehicle Radar
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Solution Overview
Problem
The connection between integrated circuit components and substrate-integrated-waveguide (SIW) antennas in vehicle-based sensing and communication systems results in microwave loss and reflections, limiting bandwidth and system performance due to the need for matching microwave components and expensive blind via processes.
Innovation Solution
A direct connection between the signal generator and the SIW is established using a ball grid array and solder balls, eliminating the need for intermediate transitions and reducing microwave losses, with the antenna member situated within the substrate and conductive members forming a substrate integrated waveguide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If microstrip or coplanar wave guide transmission lines are used to connect integrated circuit components and SIW, then an interface can be provided, but microwave loss increases and reflections are introduced that limit bandwidth
Solution Approach 1:
The patent extracts and eliminates the intermediate transmission line components (microstrip or coplanar wave guide) from the connection path between the integrated circuit and SIW antenna. By directly coupling the IC output to the SIW feed point, the harmful intermediate structures that cause microwave loss and reflections are removed, while the essential connection function is preserved through direct physical contact.
2Ease of manufacture
If microstrip transmission line is used, then connection can be established, but bandwidth is limited by the requirement for ground connection through the SIW substrate using blind via process
Solution Approach 1:
The patent removes the ground connection requirement through the SIW substrate by eliminating the microstrip transmission line structure. The direct coupling method uses the IC's existing ground reference without requiring blind vias to pass through the substrate, thereby extracting the bandwidth-limiting constraint while maintaining the essential grounding function.
3Ease of manufacture
If intermediate transition components are used to connect signal generator and SIW, then connection can be made, but system complexity increases and microwave reflections occur
Solution Approach 1:
The patent merges the signal generator output directly with the SIW feed point, eliminating the need for separate intermediate transition components. By combining these previously distinct elements into a direct coupling interface, the system complexity is reduced while the connection function is maintained through direct physical and electrical contact.
4Ease of manufacture
If intermediate transition components are used, then connection can be established, but microwave reflections are introduced that limit system performance
Solution Approach 1:
The patent extracts and removes the intermediate transition components from the signal path. By establishing direct coupling between the signal generator and SIW, the sources of microwave reflections are eliminated, thereby improving system performance and reliability while maintaining the essential connection function.
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 maximizes system performance by minimizing complexity and eliminating microwave reflections, resulting in improved bandwidth and cost-effectiveness compared to previous configurations.
Implementation Method 1
The antenna member radiates a signal into the SIW based on operation of the signal generator
Data Source
AI summary
An illustrative example electronic device includes a substrate integrated wave guide (SIW) comprising a substrate and a plurality of conductive members in the substrate. An antenna member is situated at least partially in the substrate in a vicinity of at least some of the plurality of conductive members. A signal generator has a conductive output electrically coupled with the antenna member. The antenna member radiates a signal into the SIW based on operation of the signal generator.