Fluidic Shutter Shielding Antenna Arrays

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Solution Overview

Problem

Active array antenna systems, particularly for airborne platforms, require increased reconfigurability and tunable frequency bandwidth but are limited by high power consumption and reduced reliability due to the use of diode switches and mechanical actuators.

Innovation Solution

A reconfigurable fluidic shutter using a liquid that attenuates electromagnetic radiation, which is pumped into and out of a cavity between dielectric sheets to selectively shield the antenna array, allowing for efficient and low-power operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If diode switches and mechanical actuators are used to achieve reconfigurability, then antenna performance and tunability are improved, but power consumption increases and reliability decreases

Engineering Contradiction:

ImprovereconfigurabilityVSAvoidreliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces mechanical actuators with a fluidic system using liquid metal and pumps to achieve aperture shielding. This substitution eliminates mechanical wear and failure modes while maintaining reconfigurability, directly resolving the contradiction between adaptability and reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state parameter of the shielding material from solid (mechanical actuators) to liquid (liquid metal). This parameter change enables the shielding to be pumped into and out of the radome cavity, providing reconfigurability without mechanical components, thus improving reliability while maintaining adaptability.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If diode switches and mechanical actuators are used to achieve reconfigurability, then antenna performance and tunability are improved, but power consumption increases

Engineering Contradiction:

ImprovereconfigurabilityVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent replaces power-hungry mechanical actuators with a fluidic pumping system. The pumps require significantly less power to move liquid metal compared to the power needed to drive mechanical actuators and diode switches, thus reducing overall system power consumption while maintaining reconfigurability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs hydraulic principles by using liquid metal as the working fluid that can be pumped into and out of the radome cavity. This hydraulic approach consumes less power than electrical-mechanical systems, directly addressing the power consumption issue while preserving adaptability.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Object-affected harmful factors

If a metal cover is used to shield the antenna, then RF signal protection is improved, but operational flexibility and reconfigurability are reduced

Engineering Contradiction:

ImproveRF signal protectionVSAvoidoperational flexibility

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent transforms the static metal cover into a dynamic shielding system by using liquid metal that can be pumped in and out of the radome cavity. This dynamic approach allows the system to switch between shielded and unshielded states, providing both RF signal protection and operational flexibility simultaneously.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces liquid metal as an intermediary substance between the solid metal cover and the antenna. This intermediary can be selectively positioned within the radome cavity to provide shielding only when needed, maintaining operational flexibility while ensuring RF signal protection when required.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enhances antenna performance and functionality by providing a switchable aperture that can be quickly configured for various operations with minimal power consumption and improved reliability.

Implementation Method 1

at least one pump configured to pump a liquid that attenuates electromagnetic radiation into the cavity, out of the cavity, or both

Methodology Applied

Scientific EffectElectromagnetic radiation attenuation: Absorption (EM radiation)

Data Source

PatentUS7978145B2Reconfigurable fluidic shutter for selectively shielding an antenna array

Publication Date: 2011.07.12 RAYTHEON CO

AI summary

A reconfigurable fluidic shutter for selectively shielding an antenna array includes a first surface and second surface spaced apart and defining a cavity; and a pump configured to pump liquid that attenuates electromagnetic radiation, such as a liquefied metal or alloy composition, into and out of the cavity. The first and second surface are transparent to electromagnetic radiation, for instance, microwave or other RF radiation.