Switchable Reflectarray Unit Cell for Low-Loss Beam Steering

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Solution Overview

Problem

Existing electronically scanning reflectarrays face challenges in achieving low cost, low power consumption, and minimizing signal attenuation while avoiding undesirable effects such as grating lobes.

Innovation Solution

The design incorporates N-bit reflectarray unit cells with resonant dipole structures and switches that allow for electronic configuration of reflection phases, enabling precise control of electromagnetic wave steering without mechanical adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If mechanically redirecting an antenna is used for electromagnetic wave steering, then beam steering capability is achieved, but mechanical complexity and reliability issues arise

Engineering Contradiction:

Improveelectronic beam steering capabilityVSAvoidunit cell configuration complexity

Core Design Contradiction:

Extent of automationVSDevice complexity

Solution Approach 1:

The reflectarray panel is divided into multiple electronically configurable unit cells, each capable of independent phase control. This segmentation enables electronic beam steering without mechanical movement, as each unit cell can be independently controlled to redirect electromagnetic waves in desired directions

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The unit cells incorporate electronically controllable resonant structures that can dynamically adjust their electrical length and resonant frequency. This dynamic reconfigurability allows the reflectarray to electronically steer beams and adapt to different operational requirements without mechanical adjustments

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If conventional switch configurations are used in unit cells, then electronic configurability is achieved, but signal attenuation and power consumption increase

Engineering Contradiction:

Improvereflection phase configurabilityVSAvoidsignal attenuation and power consumption

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The resonant structures are designed with variable electrical length achieved through controlled switching of conductive elements. By changing the effective electrical length of the resonant structures rather than using conventional switches, the unit cells achieve reflection phase control with reduced signal loss and lower power consumption

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Conventional mechanical or high-loss electronic switches are replaced with resonant structure configurations where phase control is achieved through electromagnetic resonance principles. This substitution reduces signal attenuation and power consumption by utilizing the natural resonant properties of the structures rather than forceful switching mechanisms

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If unit cell density is increased to improve beam steering precision, then scanning accuracy improves, but grating lobes and other undesirable effects increase

Engineering Contradiction:

Improvebeam steering precisionVSAvoidgrating lobes

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

Each unit cell is designed with locally optimized resonant structures that provide precise phase control while maintaining appropriate electrical spacing. The local quality of each unit cell's resonant response is tailored to achieve the desired reflection phase without creating conditions that lead to grating lobes, even at high densities

Inventive Principle:

Principle #3Local quality

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

This approach allows for efficient steering of electromagnetic waves with reduced signal attenuation and power consumption, while avoiding grating lobes, thus enhancing the performance and scalability of reflectarray panels.

Implementation Method 1

Unit cells comprising a resonant structure (such as a dipole) resonate at a resonant frequency when illuminated with an incident electromagnetic wave at or near the resonant frequency. The resonating effect of the resonant structure causes the until cell to absorb and radiate the electromagnetic wave so as to reflect the wave at a phase related to the resonant frequency.

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

controlling the switches 104 and 110 to connect the respective dipole parts causes the respective dipole to resonate, and disconnecting the respective dipole parts causes the respective dipole to stop resonating

Methodology Applied

Scientific EffectElectrical connection/disconnection control:

Data Source

PatentUS12334647B2N-bit reflectarray unit cell comprising switches for configuring dipole resonant structures

Publication Date: 2025.06.17 HRL LAB

AI summary

An N-bit reflectarray unit cell is disclosed comprising a first part of a first dipole and a second part of the first dipole, and a first switch for connecting and disconnecting the first part of the first dipole to and from the second part of the first dipole. The unit cell further comprises a first part of a second dipole and a second part of the second dipole, and a second switch for connecting and disconnecting the first part of the second dipole to and from the second part of the second dipole.