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WIRE MESH DIMENSIONS FOR MICROWAVE ATTENUATING MATERIALS

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Thomas R. LaSalle · 1962

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Wire mesh research from 1962 established fundamental principles for blocking microwave radiation that remain valid today.

Plain English Summary

Summary written for general audiences

This 1962 technical report examined wire mesh designs for blocking microwave radiation, focusing on protective clothing and shielding applications for radar workers. The research investigated how different mesh dimensions affect microwave attenuation effectiveness. This work laid early groundwork for understanding how conductive materials can shield against electromagnetic radiation exposure.

Why This Matters

This study represents crucial early research into EMF protection that remains highly relevant today. In 1962, scientists were already recognizing the need to shield workers from microwave radiation exposure, particularly those working with radar systems. The science demonstrates that proper shielding materials can effectively reduce EMF exposure levels.

What this means for you: the same principles studied in this wire mesh research apply to modern EMF shielding products. Whether it's your smartphone, WiFi router, or smart meter, conductive mesh materials can significantly reduce your exposure to microwave radiation. The reality is that effective EMF protection has been understood for decades, even as our exposure sources have multiplied exponentially.

Figures from the Original Paper

Diagrams extracted from the original research document.

graphPage 7 - Figure 1 - Wire diameter vs. spacing for 10 dB attenuation
p. 7 of the original PDF
chartPage 8 - Figure 2 - Wire diameter vs. spacing for -15 dB attenuation
p. 8 of the original PDF
chartPage 9 - Figure 3 - Wire diameter vs. spacing for 20 dB attenuation.
p. 9 of the original PDF
graphPage 10 - AI-described figure: Figure 4 - Wire diameter vs. spacing for 25 dB attenuation.
p. 10 of the original PDF

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 200 MHz to 30 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 200 MHz to 30 GHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Study Details

to provide a set of convenient graphs based on the formula presented in reference (b) for determining the wire size and spacing required for protective clothing and shielding to provide the desired attenuations at microwave frequencies

The charts were calculated from the empirical formula developed by Bell Telephone Laboratories and p...

Graphs showing wire diameter (D) as a function of center-to-center wire spacing (a) for representati...

The curves in the graphs are equally applicable to two perpendicular grids of wires regardless of the orientation of the electric vector or whether the incident radiation is polarized. The graphs can be used to determine wire dimensions that will provide desired attenuation at a given wavelength or band of wavelengths by choosing the appropriate graph and curve, and any combination of D and a which lies on or to the left of this curve will provide the desired (or greater) attenuation.

Cite This Study
Thomas R. LaSalle (1962). WIRE MESH DIMENSIONS FOR MICROWAVE ATTENUATING MATERIALS.
Show BibTeX
@article{wire_mesh_dimensions_for_microwave_attenuating_materials_g4110,
  author = {Thomas R. LaSalle},
  title = {WIRE MESH DIMENSIONS FOR MICROWAVE ATTENUATING MATERIALS},
  year = {1962},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

The optimal wire mesh dimensions depend on the specific microwave frequency being blocked. Generally, smaller mesh openings provide better attenuation across a wider frequency range, but the exact specifications require matching the mesh geometry to the target wavelength.
Wire mesh can be highly effective at blocking radar frequencies when properly designed. The mesh acts as a Faraday cage, with effectiveness determined by the relationship between mesh opening size and the wavelength of the electromagnetic radiation being blocked.
Yes, the fundamental physics of how conductive mesh materials block electromagnetic radiation hasn't changed since 1962. The same principles apply whether blocking radar waves then or WiFi signals today, though specific dimensions must be adjusted for different frequencies.
Radar technology was rapidly expanding in the 1960s, creating new occupational exposure risks for military and civilian workers. Scientists recognized the need to develop effective protective clothing to shield personnel from potentially harmful microwave radiation exposure.
Wire mesh provides significant attenuation but rarely blocks 100% of microwave radiation. The level of protection depends on mesh design, material conductivity, and frequency. Well-designed mesh can reduce exposure by 90% or more in many applications.