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AN IMPROVED IMPLANTABLE ELECTRIC FIELD PROBE FOR MICROWAVE DOSIMETRY

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Bassen, H., P. Herchenroeder, A. Cheung, S. Neuder · 1977

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Scientists developed precise tools to measure how microwave radiation penetrates living tissue at cell phone frequencies.

Plain English Summary

Summary written for general audiences

Researchers developed a miniaturized probe to measure microwave radiation inside biological tissues and experimental models. The 1mm x 2mm device accurately measured electromagnetic fields at 915 and 2450 MHz frequencies inside muscle-like materials. This technology enables scientists to precisely determine how much microwave energy penetrates living tissue.

Why This Matters

This 1977 study represents a crucial breakthrough in EMF research methodology that remains relevant today. The frequencies tested (915 and 2450 MHz) are particularly significant because they bracket the range used by modern wireless devices. 915 MHz sits near cellular frequencies, while 2450 MHz is the exact frequency your microwave oven uses. The development of accurate internal field measurement tools like this probe was essential for understanding how electromagnetic energy actually penetrates biological tissue, rather than just measuring what hits the surface. What makes this research especially important is that it provided the scientific foundation for measuring SAR (Specific Absorption Rate) values that regulators still use today to set exposure limits for cell phones and other wireless devices.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Bassen, H., P. Herchenroeder, A. Cheung, S. Neuder (1977). AN IMPROVED IMPLANTABLE ELECTRIC FIELD PROBE FOR MICROWAVE DOSIMETRY.
Show BibTeX
@article{an_improved_implantable_electric_field_probe_for_microwave_dosimetry_g5371,
  author = {Bassen and H. and P. Herchenroeder and A. Cheung and S. Neuder},
  title = {AN IMPROVED IMPLANTABLE ELECTRIC FIELD PROBE FOR MICROWAVE DOSIMETRY},
  year = {1977},
  
  
}

Quick Questions About This Study

The probe achieved excellent agreement with theoretical predictions at 915 MHz and 2450 MHz. These frequencies are significant because 915 MHz is near cellular bands while 2450 MHz matches microwave oven frequency.
The probe tip measured just 1mm by 2mm including insulation. This miniaturized size allowed researchers to measure electromagnetic fields inside biological tissue without significantly disturbing the field being measured.
Since this is a single-axis device, researchers must rotate it in 120-degree increments to capture the total electromagnetic field strength. This accounts for the three-dimensional nature of electromagnetic fields in biological tissue.
Researchers specially selected a Schottky diode with parameters that precisely matched the 1.5mm-long dipole antenna. This optimization achieved maximum sensitivity for detecting microwave fields inside biological materials and phantom models.
Testing in muscle-equivalent spheres showed excellent agreement with theoretically predicted electromagnetic field responses. The small probe size enabled highly repeatable measurements that closely matched scientific predictions for field behavior.