Aircraft Window RF Shielding via Capacitive Gasket

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Commercial aircraft windows and doors act as electromagnetic apertures, allowing radio frequency (RF) energy to enter and exit the aircraft, which can interfere with on-board systems and violate regulatory standards.

Innovation Solution

A system comprising a window mounting and window plug electrically coupled to the aircraft fuselage, providing a conductive path to attenuate RF energy through aircraft apertures, using a capacitive gasket and conductive materials to reflect and absorb electromagnetic radiation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional aircraft windows and doors are used, then the aircraft structure is simple and cost-effective, but RF energy transmission is high causing interference with on-board systems

Engineering Contradiction:

ImproveRF energy transmissionVSAvoidwindow and door assembly complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent implements a nested structure where the conductive mesh is embedded within the window assembly, which itself is integrated into the door structure. The window mounting structure contains the window, and the entire assembly is part of the door system. This nested arrangement provides RF shielding functionality without requiring separate external shielding components, thus reducing overall system complexity while maintaining effectiveness.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent uses a composite structure combining conductive mesh material with the window and door assembly. The conductive mesh is integrated with the window mounting structure, creating a composite assembly that provides both structural integrity and RF shielding properties. This composite approach allows the window and door to serve dual purposes: maintaining aircraft structure and providing electromagnetic protection.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If RF shielding is added to windows and doors, then RF energy transmission is reduced, but manufacturing complexity and cost increase

Engineering Contradiction:

ImproveRF energy transmissionVSAvoidmanufacturing complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent merges the RF shielding function with the existing window and door manufacturing processes. The conductive mesh is integrated into the window mounting structure during assembly, combining multiple functions (structural support, window mounting, and RF shielding) into a single manufactured component. This integration eliminates the need for separate shielding installations and simplifies the overall manufacturing process.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The window mounting structure is designed to serve multiple functions: it provides structural support for the window, enables window installation and removal, and simultaneously acts as an RF shield through the integrated conductive mesh. This multi-functional design reduces the number of separate components needed and simplifies manufacturing by consolidating functions into universal components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If conductive mesh is integrated into window assemblies, then RF shielding effectiveness is improved, but weight of the assembly increases

Engineering Contradiction:

ImproveRF shielding effectivenessVSAvoidwindow and door assembly weight

Core Design Contradiction:

Object-affected harmful factorsVSWeight of moving object

Solution Approach 1:

The patent employs a thin conductive mesh film integrated into the window mounting structure. This thin-film approach provides effective RF shielding while minimizing additional weight compared to bulkier shielding materials. The mesh configuration allows for effective electromagnetic protection with minimal material mass, adhering to the principle of using thin films for shielding applications.

Inventive Principle:

Principle #30Flexible shells and thin films

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

Effectively reduces RF energy transmission through aircraft windows, preventing external interference and ensuring compliance with regulatory standards by creating an indoor environment within the aircraft.

Implementation Method 1

conductive materials to reflect and absorb electromagnetic radiation

Methodology Applied

Scientific EffectElectromagnetic reflection: Reflection

Implementation Method 2

conductive materials to reflect and absorb electromagnetic radiation

Methodology Applied

Scientific EffectElectromagnetic absorption: Absorption (EM radiation)

Implementation Method 3

using a capacitive gasket and conductive materials

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS9038949B2Radio frequency shielding system

Publication Date: 2015.05.26 THE BOEING CO

AI summary

An assembly for shielding an aircraft from electromagnetic energy may include a window mounting configured to be conductively coupled to an aperture in a fuselage of an aircraft. The window mounting may include a window pane having an electromagnetically-reflective coating for reflecting electromagnetic energy. The window pane may remain electrically isolated from the fuselage prior to the electromagnetic energy exceeding a frequency of approximately 1 GHz. The window mounting may further include a capacitive gasket capacitively coupling the window pane to the fuselage after the frequency of the electromagnetic energy reflected by the window pane exceeds approximately 1 GHz.