Chalcogenide Tunable Capacitors for Dual-Band RIS Phase Control

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Solution Overview

Problem

Existing reconfigurable intelligent surfaces using switch technologies like PIN diodes and FETs are not suitable for wireless communications beyond 5G due to frequency limitations, size factors, ON-state series resistance, and high power consumption, especially when hundreds or thousands of unit cells are involved.

Innovation Solution

Employing chalcogenide-based phase-change materials in a dual split-ring resonator design with multi-state tunable capacitors for reconfigurable intelligent surfaces, allowing for dual-band operation at 28 GHz and 110 GHz with minimal power consumption and precise phase control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PIN diodes or FETs are used as switching technologies in reconfigurable intelligent surfaces, then the surface can be controlled to reflect and refract electromagnetic waves, but the maximum operating frequency is limited and power consumption increases

Engineering Contradiction:

Improveoperating frequency capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the material parameter from conventional semiconductor switches (PIN diodes, FETs) to phase-change material (GST alloy), enabling operation at higher frequencies (sub-terahertz bands) while reducing power consumption through non-volatile state retention

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes phase transitions of GST material between amorphous and crystalline states to achieve switching functionality, where the phase change is induced by localized heating through electromagnetic wave absorption, enabling frequency-tunable operation without continuous power supply

Inventive Principle:

Principle #36Phase transitions

2Ease of operation

If conventional switch technologies are used in each unit cell, then the surface can be reconfigured, but the switch size and ON-state series resistance increase

Engineering Contradiction:

ImprovereconfigurabilityVSAvoidswitch size

Core Design Contradiction:

Ease of operationVSLength of moving object

Solution Approach 1:

The patent replaces mechanical/electronic switch structures (PIN diodes, FETs) with a phase-change material-based switching mechanism that uses electromagnetic field-induced phase transitions, eliminating the need for bulky switch components and reducing ON-state series resistance

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If a large number of base stations are installed to provide coverage to blocked areas, then wireless communication coverage is improved, but infrastructure costs increase many times

Engineering Contradiction:

Improvewireless communication coverageVSAvoidinfrastructure quantity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent creates a multi-functional metasurface that can simultaneously reflect, refract, and focus electromagnetic waves across different frequency bands, replacing the need for multiple dedicated base stations with a single reconfigurable surface that adapts to different coverage requirements

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 efficient, low-power operation of reconfigurable intelligent surfaces for 5G and beyond, providing enhanced wireless communication coverage with precise beamforming and interference control, suitable for both indoor and outdoor scenarios.

Implementation Method 1

absorb an amount of energy from an electromagnetic signal incident on the reconfigurable intelligent surface sufficient to change a resistance state of the chalcogenide material

Methodology Applied

Scientific EffectElectromagnetic heating: Dielectric Heating

Implementation Method 2

the chalcogenide material changes from a first resistance state to a second resistance state in response to absorbing energy from the electromagnetic signal

Methodology Applied

Scientific EffectPhase change: Phase Change

Data Source

PatentUS12444544B2Chalcogenides-based dual-band tuning for changing resistance states of reconfigurable intelligent surfaces of devices

Publication Date: 2025.10.14 DELL PROD LP

AI summary

The technology described herein is directed towards phase-change material-based (e.g., chalcogenide) radio frequency components including for use in unit cells of a reconfigurable intelligent surface. A multi-state tunable capacitive element for reconfigurable operation is described, in which phase-change material operates as a switching element to controllably vary capacitance of each unit cell. The multi-state tunable capacitive element can be made of multiple subcircuits in which capacitors of various values can be selectively switched in or out to vary the capacitance of the tunable capacitive element. Arranging the subcircuits with capacitors of different values, and actuating each one in or out of the overall capacitive element, an analog-like variable capacitor is realized that provides more granular phase shift control of cells of a reconfigurable intelligent surface. When used with a dual split ring resonator capacitor, phase changes of a unit cell are achieved that redirect electromagnetic waves of two different frequencies.