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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.

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Related Experiment Video

Updated: Jun 29, 2026

A Fabrication Method for Highly Stretchable Conductors with Silver Nanowires
07:50

A Fabrication Method for Highly Stretchable Conductors with Silver Nanowires

Published on: January 21, 2016

Multidirectional strain-insensitive stretchable RF electronics.

Furong Yang1,2, Senhao Zhang3,4, Jinyao Zhang1

  • 1College of Electronics and Information Engineering, Shenzhen University, Shenzhen, 518060, China.

Nature Communications
|June 27, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel dual-port multidirectional strain-insensitive antenna (DP-MSiA) for wearable electronics. This antenna maintains stable performance under significant strain, enabling reliable wireless communication and energy harvesting for body-centric systems.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Wearable Technology

Background:

  • Stretchable radio-frequency (RF) electronics are crucial for wearable systems, enabling body-centric communication, health monitoring, and wireless power transfer.
  • On-body stretchable antennas face challenges due to multidirectional in-plane strain during natural motion, leading to resonance detuning and wireless link instability.
  • Existing strain-insensitive antenna designs often exhibit limitations in effectiveness across diverse loading directions and may compromise radiation performance.

Purpose of the Study:

  • To establish a systematic directional mechano-electromagnetic analysis framework for resonant planar antennas.
  • To introduce a dual-port multidirectional strain-insensitive antenna (DP-MSiA) that overcomes limitations of existing designs.
  • To demonstrate the practical application of the DP-MSiA in strain-insensitive wireless energy harvesting and robust on-body communication systems.

Main Methods:

  • Developed a systematic directional mechano-electromagnetic analysis framework for resonant planar antennas.
  • Designed and fabricated a dual-port multidirectional strain-insensitive antenna (DP-MSiA).
  • Evaluated antenna performance under varying degrees (up to 45%) and directions of in-plane strain, assessing resonance shift and realized gain.

Main Results:

  • Achieved strain-insensitive resonance with a minimal shift (≤ 40 MHz at 2.45 GHz) under up to 45% strain across diverse in-plane directions.
  • Demonstrated strain-insensitive wireless energy harvesting using rectifiers integrated with the DP-MSiA under varying strain conditions.
  • Showcased a strain-robust on-body communication system capable of sustaining stable multimodal health-data transmission during natural motion.

Conclusions:

  • The developed DP-MSiA offers significant improvements in strain insensitivity and performance stability for wearable RF electronics.
  • The systematic analysis framework provides a valuable tool for designing future deformation-insensitive electronic components.
  • This work enables new opportunities for robust, integrated functionalities in wearable and embodied systems, enhancing reliability during physical activity.