Nano-Filled Radome Coating for RF-Transparent Ice Repulsion

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Solution Overview

Problem

Ice formation on radome surfaces of radar systems causes significant radiofrequency interference, affecting system performance and operation, necessitating effective means to prevent ice accumulation.

Innovation Solution

A coating arrangement on the radome substrate comprising a primer and a topcoat with nanoparticles, where the nanoparticles are dispersed throughout either the primer or topcoat, allowing RF signals to induce heating and prevent ice formation without impacting RF transparency or requiring additional power sources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a coating is applied to prevent ice formation on radome, then ice formation is reduced, but RF transparency may be compromised

Engineering Contradiction:

Improveice formationVSAvoidRF transparency

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The coating uses a composite material system consisting of dielectric polymer matrix combined with metal nanoparticle dispersion. This composite structure allows the coating to provide ice protection through RF-induced heating while maintaining RF signal transparency. The nanoparticle concentration is optimized to generate sufficient heat without compromising radar performance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the physical parameters of the coating by incorporating nanoparticles with specific dielectric properties and controlling their concentration (0.1-10 wt%). The particle size, shape, and distribution are also controlled to optimize both the heating efficiency for ice prevention and the RF transparency for radar operation.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If heating is applied to prevent ice formation, then ice accumulation is prevented, but additional power is required

Engineering Contradiction:

Improveice accumulationVSAvoidpower consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The coating system is self-powered by utilizing the RF signals already present in the radar system. The dielectric nanoparticles absorb the RF energy and convert it to heat through dielectric heating, eliminating the need for separate power sources or heating systems. The radar's own operational signals provide the energy needed for ice prevention.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention converts the potentially harmful RF energy (which could cause heating) into a beneficial effect by using it to prevent ice formation. The RF signals that are necessary for radar operation are simultaneously utilized to heat the coating and prevent ice accumulation, turning a potential problem into a solution.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Temperature

If nanoparticles are added to the coating, then RF-induced heating is enabled, but manufacturing complexity increases

Engineering Contradiction:

ImproveRF-induced heating capabilityVSAvoidcoating application process

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The coating utilizes a porous or dispersed structure where nanoparticles are distributed throughout the polymer matrix. This structure allows for straightforward manufacturing through dip-coating or spray-application processes, where the nanoparticle-polymer slurry is applied and then cured. The porous structure facilitates even nanoparticle distribution and simplifies the manufacturing process.

Inventive Principle:

Principle #31Porous 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

The coating arrangement effectively prevents ice formation by generating heat through RF-induced heating of nanoparticles, maintaining RF transparency and not increasing the radome's weight or affecting radar performance.

Implementation Method 1

the heating of the nanoparticles is induced by the RF signals

Methodology Applied

Scientific EffectDielectric heating: Dielectric Heating

Data Source

PatentUS20240327648A1Method of formulating an active ice-repulsing nano-filled coating

Publication Date: 2024.10.03 RAYTHEON CO

AI summary

An article transparent to radiofrequency (RF) signals includes a substrate and a coating arrangement on the substrate. The coating arrangement includes a primer applied to and in physical contact with the substrate, a topcoat applied to and in physical contact with the primer layer, the topcoat including an organic polymer material, and nanoparticles dispersed throughout one of the primer and the topcoat. A content of the nanoparticles ranges from 0.1 wt % to 10 wt %.