Stretchable Antenna With Lateral Spring Structure
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Solution Overview
Problem
Existing wearable electronics face challenges in maintaining functionality due to the need for stretchability and flexibility to accommodate body movements, particularly in areas like elbow, finger joints, wrist, knee, and ankle, where traditional rigid antennas fail to perform consistently at constant frequencies during stretching.
Innovation Solution
The development of stretchable antennas using a metal/polymer bilayer with a lateral spring structure, where a metallic thin film is coupled with a flexible polymer like polyimide or PDMS, allowing the antenna to twist out-of-plane and maintain functionality even under significant strain, preventing metal cracking and ensuring constant frequency operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid metallic antenna structure is used, then manufacturing precision and electrical performance are improved, but flexibility and stretchability deteriorate
Solution Approach 1:
The patent applies this principle by using a thin metallic film (30-100 nm thickness) deposited on a flexible polymer substrate. The thin film structure provides the necessary electrical conductivity for antenna operation while the flexible polymer substrate enables stretchability and conformability to body surfaces, directly resolving the contradiction between structural precision and adaptability
Solution Approach 2:
The patent employs composite materials by combining metallic thin films (copper, aluminum, or silver) with flexible polymer substrates (polyimide, PDMS, or spandex). This composite structure integrates the electrical properties of metals with the mechanical flexibility of polymers, enabling the antenna to maintain manufacturing precision while achieving stretchability up to 30% strain
2Adaptability or versatility
If the antenna is made flexible and stretchable, then adaptability to body movements is improved, but frequency stability deteriorates
Solution Approach 1:
The patent applies dynamics by designing the antenna with a spring-like serpentine structure that can dynamically adjust its geometry during stretching. The antenna geometry is specifically designed to undergo controlled deformation that maintains electrical length stability, allowing the antenna to adapt to body movements while preserving frequency stability through dynamic geometric compensation
Solution Approach 2:
The patent utilizes parameter changes by carefully controlling the metallic thin film thickness (30-100 nm) and the polymer substrate properties to maintain consistent electrical characteristics during mechanical deformation. The antenna design incorporates specific geometric parameters that compensate for stretching effects, ensuring frequency stability across a range of strains up to 30%
3Adaptability or versatility
If a thin metallic film is used on a flexible substrate, then stretchability is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent applies this principle by using an extremely thin metallic film (30-100 nm) deposited on a flexible polymer substrate. The thin film structure provides the necessary electrical conductivity for antenna operation while the flexible polymer substrate enables stretchability up to 30% strain, directly resolving the contradiction between structural precision and adaptability
Solution Approach 2:
The patent employs composite materials by combining metallic thin films (copper, aluminum, or silver) with flexible polymer substrates (polyimide, PDMS, or spandex). This composite structure integrates the electrical properties of metals with the mechanical flexibility of polymers, enabling the antenna to maintain manufacturing precision while achieving stretchability
4Ease of operation
If the antenna structure is made conformal to body surfaces, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent applies this principle by using a thin metallic film (30-100 nm thickness) deposited on a flexible polymer substrate. The thin film structure provides the necessary electrical conductivity for antenna operation while the flexible polymer substrate enables stretchability and conformability to body surfaces, directly resolving the contradiction between structural precision and adaptability
Solution Approach 2:
The patent applies universality by designing a single flexible antenna structure that can be deployed across multiple body locations (wrist, ankle, elbow, knee) and applications (health monitoring, communication, sensing). The universal flexible platform eliminates the need for location-specific rigid antenna designs, reducing overall device complexity while maintaining ease of operation across diverse applications
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 stretchable antenna design enables reliable far-field communication up to 80 meters with 1.25 mW transmitted power, maintaining performance and frequency stability during stretching and bending, suitable for wearable health monitoring applications.
Implementation Method 1
The metal layer can be disposed on the polymer layer by electroplating
Implementation Method 2
The polymer layer can be disposed on the substrate by spin coating
Data Source
Figure 1A~2B
Figure 3
Figure 4A~4D
AI summary
Various examples are provided for stretchable antennas that can be used for applications such as wearable electronics. In one example, a stretchable antenna includes a flexible support structure including a lateral spring section having a proximal end and at a distal end; a metallic antenna disposed on at least a portion of the lateral spring section, the metallic antenna extending along the lateral spring section from the proximal end; and a metallic feed coupled to the metallic antenna at the proximal end of the lateral spring section. In another example, a method includes patterning a polymer layer disposed on a substrate to define a lateral spring section; disposing a metal layer on at least a portion of the lateral spring section, the metal layer forming an antenna extending along the portion of the lateral spring section; and releasing the polymer layer and the metal layer from the substrate.