Radar Substrate Waveguide Shielding for Low-Noise Object Detection
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Solution Overview
Problem
Existing radar technologies face challenges in reducing noise interference when transmitting and receiving signals for object detection, which can lead to inaccurate distance and velocity measurements.
Innovation Solution
The electronic device incorporates a substrate with a waveguide that guides transmission and reflected waves between surfaces, and is covered with an electromagnetic wave shielding member positioned 1/4 of a wavelength away from the surface, effectively reducing noise interference by shielding the waveguide and power supply device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power supply device and radio frequency circuit are disposed close together to reduce device size, then integration is improved, but noise interference from the power supply device affects the radio frequency circuit
Solution Approach 1:
An electromagnetic wave shielding member is introduced as an intermediary between the power supply device and the radio frequency circuit. This shielding member blocks electromagnetic waves generated by the power supply device, preventing them from interfering with the radio frequency circuit while allowing both components to be disposed close together on the same substrate.
Solution Approach 2:
The substrate is divided into a first surface for disposing the radio frequency circuit and a second surface for disposing the power supply device. This spatial segmentation on opposite surfaces reduces electromagnetic interference while maintaining compact integration, complemented by the shielding member for additional protection.
2Object-affected harmful factors
If the gap between the printed circuit board and housing is narrowed to reduce noise transmission, then noise shielding is improved, but manufacturing precision requirements increase
Solution Approach 1:
The electromagnetic wave shielding member acts as an intermediary that provides effective noise blocking without requiring tight gaps between the printed circuit board and housing. This eliminates the need for high-precision gap control while achieving the same noise reduction effect.
3Volume of moving object
If the transmission antenna and reception antenna are disposed close together to reduce device size, then integration is improved, but noise from the transmission wave interferes with the reception wave
Solution Approach 1:
The substrate surfaces are segmented into a first surface for antennas and a second surface for electronic components. This spatial separation reduces interference between transmission and reception paths while maintaining compact device size.
Solution Approach 2:
The electromagnetic wave shielding member provides intermediary protection for the reception path, blocking transmitted waves from interfering with the sensitive reception antenna and circuitry.
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 significantly reduces noise interference, enhancing the accuracy of object detection and measurement in radar systems, particularly in automotive and mobility applications.
Implementation Method 1
The substrate includes a waveguide configured to guide at least one of the transmission wave or the reflected wave between the first surface and the second surface
Implementation Method 2
The waveguide is covered with an electromagnetic wave shielding member that is apart from the second surface of the substrate by a distance of 1/4 of a wavelength of the transmission wave or the reflected wave
Data Source
AI summary
An electronic device includes a transmission unit that transmits a transmission wave from a transmission antenna; a reception unit that receives, from a reception antenna, a reflected wave of the transmission wave; a controller that detects an object that reflects the transmission wave; a power supply device that supplies electric power to at least any of the foregoing components; and a substrate having the foregoing components thereon. The transmission and reception antennas are disposed on a first surface of the substrate. The controller and the power supply device are disposed on a second surface of the substrate opposite to the first surface. The substrate includes a waveguide that guides the transmission wave and/or the reflected wave between the first and second surfaces and is covered with an electromagnetic wave shielding member apart from the second surface by a distance of ¼ of a wavelength of the transmission or reflected wave.