Graphene Non-Reciprocal RF Microelectronic Components
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Solution Overview
Problem
Existing radiofrequency and microwave components lack non-reciprocity, leading to signal reflection issues, and current solutions like ferrite-based circulators are bulky and expensive, while micro-switch based solutions require specific component manufacturing.
Innovation Solution
Incorporating one or more layers of graphene into passive microelectronic components to exploit electromagnetic polarization properties, determining a preferential direction for signal transmission and attenuation, thereby achieving non-reciprocity without increasing component size or manufacturing cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferrite and permanent magnet structure is used to create non-reciprocal circulator, then non-reciprocity is achieved, but the component becomes bulky and expensive
Solution Approach 1:
The patent changes the physical parameters of the transmission line by introducing a chiral structure characterized by pitch and helix angle, which fundamentally alters the electromagnetic wave propagation properties to achieve non-reciprocity without bulky ferrite materials
Solution Approach 2:
The invention creates a composite structure combining conductive elements arranged in helical patterns with dielectric materials, forming a chiral transmission line that exhibits non-reciprocal transmission properties while maintaining compact dimensions
2Reliability
If ferrite and permanent magnet structure is used to create non-reciprocal circulator, then non-reciprocity is achieved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive ferrite and permanent magnet materials with inexpensive conductive materials (such as copper or aluminum) arranged in chiral geometric patterns, dramatically reducing material costs while achieving the same non-reciprocal function
Solution Approach 2:
By changing from material-based non-reciprocity (ferrite) to geometry-based non-reciprocity (chiral structure), the invention enables standard manufacturing techniques to be used instead of specialized ferrite processing, reducing manufacturing complexity and cost
3Volume of moving object
If micro-switches are used to create non-reciprocal component, then size is reduced, but specific component manufacturing is required
Solution Approach 1:
The chiral transmission line structure can be integrated into existing microelectronic fabrication processes using standard deposited conductive and dielectric layers, making it compatible with conventional CMOS manufacturing rather than requiring specialized micro-switch fabrication
Solution Approach 2:
The invention merges the non-reciprocal function directly into the transmission line structure itself, eliminating the need for separate micro-switch components and their associated complex manufacturing processes
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 graphene-based approach effectively creates non-reciprocal passive microelectronic components that transmit signals in a preferred direction with minimal loss, reducing signal reflection and maintaining a small footprint, thus addressing the need for cost-effective and compact non-reciprocal components.
Implementation Method 1
a single layer of graphene exhibits good electrical conduction and a property of polarization of an electromagnetic field through the layer, the angle of rotation associated with the polarization being dependent on an electric potential applied to the graphene layer
Data Source
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AI summary
The invention concerns passive radio-frequency microelectronic components for integrated circuits, comprising a dielectric substrate (S) and at least one metal conductive layer disposed on said substrate, said conductive layer comprising at least a first metal conductive part (C1) and a second metal conductive part (C2) separated by insulation (I). A microelectronic component according to the invention comprises at least one graphene layer (G) disposed so that a radio-frequency or hyper-frequency signal passes through said at least one graphene layer (G) when it is transmitted between said first metal conductive part and said second metal conductive part, said graphene layer (G) being capable, when it is subjected to an electrical potential, of transmitting said radio-frequency or hyper-frequency signal in a first direction, and of attenuating said radio-frequency or hyper-frequency signal in a second direction opposite said first direction. The invention applies in particular to transmission-line, capacitor and microswitch microelectronic components.