Radar Shielding Member Structure for Moisture-Driven Transmission Loss

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Solution Overview

Problem

The use of foamed resin in shielding members for radar apparatuses leads to increased transmission loss due to moisture absorption, degrading performance.

Innovation Solution

A shielding member design comprising a flat first portion made of foamed resin, surrounded by a second portion and third portions made of non-foamed resin, with a boundary set to minimize moisture absorption and transmission loss across varying incident angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a shielding member is made of foamed resin, then transmission loss of millimeter waves is reduced, but moisture enters the bubbles during use resulting in increased transmission loss and degraded performance

Engineering Contradiction:

Improvetransmission lossVSAvoidperformance stability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The shielding member is divided into multiple regions with different foam densities. The first region has a lower foam ratio while the second region has a higher foam ratio, creating functional segments that address different requirements simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the shielding member are assigned different foam ratios according to the local incident angles of millimeter waves. Regions experiencing different wave angles have optimized foam densities to minimize transmission loss while maintaining moisture resistance.

Inventive Principle:

Principle #3Local quality

2Strength

If the shielding member uses foamed resin, then the structural integrity is improved, but moisture absorption increases leading to performance degradation

Engineering Contradiction:

Improvestructural integrityVSAvoidmoisture absorption

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The shielding member employs varying foam ratios in different regions, with denser foam structures in areas more susceptible to moisture ingress while maintaining appropriate foam density in other areas for optimal wave transmission.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The shielding member combines foam resin with varying density ratios to create a composite structure that balances mechanical strength, moisture resistance, and electromagnetic wave transmission properties.

Inventive Principle:

Principle #40Composite materials

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

Prevents increase in transmission loss and maintains performance by using a combination of foamed and non-foamed resin portions, enhancing structural integrity and reducing moisture absorption.

Implementation Method 1

a first portion (18a) made of foamed resin

Methodology Applied

Scientific EffectDielectric: Dielectric

Implementation Method 2

moisture from the air may enter the bubbles in the foamed resin during use, resulting in increased transmission loss

Methodology Applied

Scientific EffectHydrophobe: Hydrophobe

Data Source

PatentUS20250216502A1Shielding member, radar apparatus

Publication Date: 2025.07.03 STANLEY ELECTRIC CO LTD

AI summary

A shielding member for use in a radar apparatus including: a flat first portion made of foamed resin; a second portion made of non-foamed resin, disposed to surround the first portion so as to contact a side surface of the first portion; and a third portion made of non-foamed resin, disposed to contact each of one surface and the other surface of the first portion.