Graphene Ground Electrode Voltage-Tunable Phase Shifter
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Solution Overview
Problem
Existing phase shifters, particularly those using varactor diodes and ferroelectric materials, face challenges such as high costs, complex integration, and the need for high voltages, making them unsuitable for efficient and cost-effective use in portable electronic devices and communication systems.
Innovation Solution
A voltage-tunable phase shifter utilizing a graphene ground electrode, which generates an electric field to change the phase of electromagnetic signals by varying the potential difference between a conducting line and the graphene electrode, leveraging the quantum capacitance of graphene to control phase modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If varactor diodes are used as phase modulating elements, then phase tuning capability is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the phase modulation function from complex multi-component varactor diode assemblies and implements it using a single-layer graphene electrode that directly modulates the phase of electromagnetic waves through its quantum capacitance effect, eliminating the need for multiple discrete components
Solution Approach 2:
The patent changes the fundamental parameter used for phase modulation from varactor diode capacitance to graphene quantum capacitance, which can be continuously tuned by adjusting the electrochemical potential via gate voltage, enabling simpler device architecture with fewer components
2Ease of operation
If ferroelectric materials are used for phase modulation, then phase control is achieved, but high operating voltages are required
Solution Approach 1:
The patent transitions from using high-voltage ferroelectric materials to low-voltage graphene-based quantum capacitance modulation, where the phase control is achieved through electrochemical potential adjustment at much lower voltage levels, reducing energy consumption and eliminating high-voltage requirements
Solution Approach 2:
The patent replaces the ferroelectric material's high-voltage electric field mechanism with graphene's quantum capacitance mechanism that responds to lower voltages through electrochemical potential changes, substituting a high-energy physical mechanism with a lower-energy quantum mechanical effect
3Ease of operation
If ferroelectric materials are integrated into circuits, then phase modulation is achieved, but integration difficulty increases
Solution Approach 1:
The patent removes ferroelectric materials from the circuit integration process entirely and replaces them with graphene, which can be deposited as a thin film using standard semiconductor fabrication techniques, eliminating the integration challenges associated with ferroelectric material compatibility
Solution Approach 2:
The patent uses graphene, a two-dimensional material with unique electrical properties, as a composite electrode structure that can be integrated into existing circuit architectures without requiring special handling or processing, unlike bulk ferroelectric materials
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
The solution provides a simplistic, cost-effective, and efficient means to control the phase of electromagnetic signals, overcoming the limitations of traditional phase shifters by using graphene's quantum capacitance, suitable for use in portable devices and communication systems.
Implementation Method 1
the electric field configured to change the phase of an electromagnetic signal propagating along the conducting line
Implementation Method 2
leveraging the quantum capacitance of graphene to control phase modulation
Data Source
AI summary
A voltage-tunable phase shifter comprising a conducting line and a ground electrode separated by a layer of dielectric material, the phase shifter configured to generate an electric field when a potential difference is applied between the conducting line and ground electrode, the electric field configured to change the phase of an electromagnetic signal propagating along the conducting line, wherein the ground electrode comprises graphene, and wherein the change in phase is dependent upon the strength of electric field and can be controlled by varying the potential difference between the conducting line and the ground electrode.