Waveguide-Shielded Light Receiver for High-Frequency EMI
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Solution Overview
Problem
Existing light-receiving devices, such as those used in laser scanners for screen door obstacle detection, malfunction due to high-frequency electromagnetic waves with high power density, particularly with the advent of 5G services, leading to instability and reliability issues in public transportation safety facilities.
Innovation Solution
A light-receiving device with a waveguide-shaped structure that extends in the direction of photons and high-frequency electromagnetic waves, surrounded by an insulating layer, which can take the form of a circular or rectangular waveguide, and may include a dipole antenna structure to block or redirect high-frequency electromagnetic waves, preventing interference and ensuring proper operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-receiving device is used in a laser scanner for obstacle detection, then the device can detect objects within a certain range, but the device malfunctions when exposed to high-frequency electromagnetic waves with high power density
Solution Approach 1:
A waveguide-shaped electromagnetic wave blocking structure is introduced as an intermediary component between the light-receiving device and the external environment. This structure acts as a mediator that selectively blocks harmful high-frequency electromagnetic waves while allowing legitimate laser light to pass through, thereby protecting the light-receiving device from electromagnetic interference without compromising its detection function
Solution Approach 2:
The waveguide-shaped blocking structure converts the harmful effect of electromagnetic waves into a beneficial filtering function. By designing the waveguide with specific dimensional characteristics, it exploits electromagnetic wave propagation principles to block harmful frequencies while transmitting useful light signals, thus transforming a potential harm into a protective mechanism
2Object-affected harmful factors
If a waveguide-shaped structure is added to block electromagnetic waves, then electromagnetic interference is reduced, but the device complexity increases
Solution Approach 1:
The waveguide-shaped blocking structure is designed to serve multiple functions simultaneously: it blocks harmful electromagnetic waves, maintains the structural integrity of the device, and can be integrated with the light-receiving device's existing architecture. By making this component multi-functional, the patent reduces the need for additional separate protective elements, thereby limiting the increase in overall device complexity
Solution Approach 2:
The blocking structure's effectiveness is optimized by carefully selecting and adjusting its dimensional parameters (such as waveguide width, height, and length) to match the specific frequency range of harmful electromagnetic waves. This parameter optimization allows the structure to be as simple as possible while maintaining maximum blocking efficiency, avoiding unnecessary 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
The solution effectively blocks or redirects high-frequency electromagnetic waves, preventing malfunctions and maintaining the reliability and stability of light-receiving devices in environments exposed to high-power density electromagnetic waves, thereby ensuring the safety and functionality of public transportation systems.
Implementation Method 1
a waveguide-shaped structure that extends in a traveling direction of photons and high-frequency electromagnetic waves incident on a light-receiving area and that surrounds the light-receiving area
Implementation Method 2
A light-receiving device is a device that transforms light energy into electric energy and is divided into a light detector (or a light sensor) and a solar cell
Implementation Method 3
an insulating layer configured to fix the waveguide-shaped structure
Data Source
AI summary
A light-receiving device having an electromagnetic interference removal function is provided. The light-receiving device includes a waveguide-shaped structure that extends in a traveling direction of photons and high-frequency electromagnetic waves incident on a light-receiving area and that surrounds the light-receiving area, and an insulating layer configured to fix the waveguide-shaped structure.