Dielectric Housing for Radio Wave Sensor
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Solution Overview
Problem
Existing radio wave sensors face errors in detection due to direct radio wave entry from the transmitting antenna into the receiving antenna, resulting from strong electric field coupling, which affects the accuracy of object presence detection.
Innovation Solution
A radio wave sensor design featuring a housing with distinct dielectric parts facing the transmitting and receiving antennas, where the thickness of the parts between them is thinner than those facing the antennas, strengthening the electric field coupling between the antennas and the housing, thereby reducing direct radio wave entry and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting and receiving antennas are mounted on a substrate with a space between them and covered by a housing, then the antenna structure is protected and integrated, but direct radio wave entry from the transmitting antenna to the receiving antenna occurs due to strong electric field coupling, causing detection errors
Solution Approach 1:
The housing is divided into three parts with different thicknesses: first and second parts facing the transmitting and receiving antennas are thicker, while the third part between them is thinner. This local variation in thickness creates different electric field coupling strengths in different regions, allowing the thinner third part to reduce direct radio wave coupling while the thicker first and second parts maintain proper antenna operation and protection.
2Ease of manufacture
If the housing has uniform thickness, then manufacturing is simplified, but the electric field coupling between transmitting and receiving antennas cannot be effectively controlled, leading to detection errors
Solution Approach 1:
The housing employs non-uniform thickness distribution with three distinct parts. The thinner third part located between the antennas specifically targets the region where direct radio wave coupling occurs, reducing harmful electric field interaction. This localized thickness variation can be integrated into standard manufacturing processes while achieving precise control over electromagnetic field distribution.
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 effectively suppresses errors in detection by directing more radio waves towards the intended paths and reducing unwanted coupling between the antennas, improving the accuracy of object presence detection.
Implementation Method 1
the thickness of the parts between them is thinner than those facing the antennas, strengthening the electric field coupling between the antennas and the housing
Implementation Method 2
a housing that is composed of dielectric material and faces the transmitting and receiving antennas
Implementation Method 3
a transmitting antenna configured to radiate radio waves
Implementation Method 4
a receiving antenna configured to receive incoming radio waves... configured to detect the presence of an object when the receiving antenna receives radio waves (reflected waves)
Data Source
AI summary
A radio wave sensor includes a transmitting antenna configured to radiate radio waves, a receiving antenna configured to receive incoming radio waves, and a housing that is composed of dielectric material and faces the transmitting and receiving antennas. The housing has a first part that faces the transmitting antenna, a second part that faces the receiving antenna, and a third part between the first and second parts. In a facing direction in which a bottom board of the housing faces the transmitting and receiving antennas, respective thickness of the first and second parts is thicker than thickness of the third part.