Optically Tunable Metamaterial Unit Cell for Antenna Beam Steering

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Solution Overview

Problem

Conventional phase shifters in antenna arrays are expensive and prone to electromagnetic interference (EMI), complicating design and increasing costs due to complex electronic circuits.

Innovation Solution

An optically tunable metamaterial unit cell with a dielectric substrate, arrays of metamaterial elements, and a layer of photo-capacitive material that adjusts capacitance with light intensity, allowing for dynamic control of electromagnetic beam direction and phase shift without electrical wires, reducing EMI and costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional electrically controlled phase shifters are used in antenna arrays, then beam steering capability is achieved, but device cost and complexity increase due to complicated electronic circuits

Engineering Contradiction:

Improvebeam steering capabilityVSAvoidelectronic circuit complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent replaces electrically controlled phase shifters with optically controlled metamaterial elements. Instead of using complex electronic circuits to control phase, the invention uses optical control through photo-capacitive materials that change capacitance in response to light intensity, thereby controlling the phase of reflected electromagnetic waves without electrical connections at each element

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces photo-capacitive material as an intermediary between optical control signals and electromagnetic wave phase modulation. The photo-capacitive material converts light intensity changes into capacitance changes, which then control the phase of reflected electromagnetic waves, providing a bridge between optical and electromagnetic domains without direct electrical connections

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If conventional electrically controlled phase shifters are used in antenna arrays, then beam steering capability is achieved, but electromagnetic interference between elements increases

Engineering Contradiction:

Improvebeam steering capabilityVSAvoidelectromagnetic interference

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent eliminates electrical conductors and electronic circuits at each antenna element by using optically controlled metamaterial elements. The photo-capacitive materials are controlled by optical signals rather than electrical signals, removing the source of electromagnetic interference between elements while maintaining beam steering capability through optical phase control

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If conventional electrically controlled phase shifters are used in antenna arrays, then beam steering capability is achieved, but manufacturing and operation costs increase

Engineering Contradiction:

Improvebeam steering capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent uses metamaterial elements with photo-capacitive materials that can be manufactured using standard lithography techniques, replacing expensive electronic phase shifter circuits. The optically controlled elements are simpler in structure and can be fabricated more cheaply, even if the photo-capacitive material has limited operational lifetime under intense illumination

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes expensive electronic control circuits with optical control mechanisms. The metamaterial elements controlled by photo-capacitive materials respond to optical signals, eliminating the need for complex electronic infrastructure and reducing both manufacturing and operational costs

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enables low-cost, efficient steering and shaping of electromagnetic beams by optically tuning metamaterial elements, reducing side lobes and electromagnetic interference, and simplifying antenna array design.

Implementation Method 1

a layer of photo-capacitive material overlapping the at least two arrays of metamaterial elements, the photo-capacitance of the photo-capacitive material being optically tunable

Methodology Applied

Scientific EffectPhoto-capacitance: Photoelectric Effect

Implementation Method 2

at least two arrays of metamaterial elements located on the top surface thereof, the metamaterial being capable of reflecting electromagnetic radiation

Methodology Applied

Scientific EffectElectromagnetic reflection: Reflection

Data Source

PatentUS10734732B1Optically controlled reflect phased array based on photosensitive reactive elements

Publication Date: 2020.08.04 THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY

AI summary

An optically tunable metamaterial unit cell is provided for photonic switching. The cell is optically tunable and includes a dielectric substrate with upper and lower surfaces. The cell further includes arrays of metamaterial elements and a layer of photo-capacitive material. The arrays are disposed the upper surface of the dielectric substrate. The metamaterial is capable of reflecting electromagnetic radiation. The layer of photo-capacitive material overlaps the arrays of metamaterial elements. The photo-capacitive material is optically tunable.