Vehicular Radar Sensor Copper PCB Waveguide Integration
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Solution Overview
Problem
Current vehicle sensing systems using multiple PCBs for radar sensors are costly and complex, requiring an expensive glue process and tight alignment, and face mechanical issues like thermal expansion affecting signal quality.
Innovation Solution
A single printed circuit board (PCB) with two High Frequency-laminate layers and a copper layer, where the waveguide is realized within the copper layer, eliminating the need for multiple PCBs and enhancing heat transfer, simplifying manufacturing and improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple PCBs are used for radar sensors, then signal quality can be maintained, but manufacturing cost increases and alignment complexity increases
Solution Approach 1:
The patent combines multiple separate PCB components (signal layer, ground layer, and waveguide structure) into a single integrated PCB assembly. The waveguide is formed directly within the PCB structure using conductive traces and ground planes, eliminating the need for separate waveguide components and multiple PCBs. This integration maintains signal quality while simplifying manufacturing and alignment procedures.
2Manufacturing precision
If multiple PCBs are used for radar sensors, then signal quality can be maintained, but manufacturing cost increases
Solution Approach 1:
The patent integrates multiple PCB layers and waveguide functionality into a single PCB structure, reducing the total number of components that need to be manufactured and assembled. This consolidation reduces material costs, labor costs for assembly, and quality control expenses while maintaining the necessary signal quality for radar operation.
3Ease of manufacture
If traditional PCB structure is used, then manufacturing is simple, but thermal expansion affects signal quality
Solution Approach 1:
The patent modifies the PCB structure by incorporating a waveguide formed with specific geometric parameters and material properties that provide thermal stability. The waveguide structure uses controlled impedance traces and ground planes with dimensions and spacing designed to compensate for thermal expansion effects, maintaining signal quality across temperature variations while keeping the manufacturing process relatively simple.
4Temperature
If copper layer with waveguide is used, then heat transfer is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent combines the waveguide structure with the PCB's copper routing layers, so that the same copper traces and ground planes that provide electrical connectivity also form the waveguide structure for RF signal transmission. This dual-function design enhances heat transfer through the copper layer while avoiding the need for separate waveguide manufacturing processes, thus not increasing manufacturing complexity.
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 solution reduces manufacturing costs, simplifies alignment, and improves signal quality and heat dissipation, overcoming thermal expansion issues, while allowing for efficient object detection and vehicle control.
Implementation Method 1
enhancing heat transfer, simplifying manufacturing and improving signal quality
Data Source
AI summary
A method for constructing a vehicular radar sensor includes providing antenna structure and a printed circuit board having a first layer and a second layer with a copper layer disposed between the first and second layers. The antenna structure includes transmitting antennas that are operable to transmit radio signals, and receiving antennas that receive radio signals transmitted by the transmitting antennas and reflected from an object. The first layer is joined to a first side of the copper layer and the second layer is joined to a second side of the copper layer, with the copper layer spanning between and contacting opposed surfaces of the first and second layers. At least one waveguide is established through the copper layer. Electronic circuitry is disposed at the first layer of the printed circuit board and at least part of the antenna structure is disposed at the second layer of the printed circuit board.