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AUTOMATED DIELECTRIC MEASUREMENTS WITH A SMALL MONOPOLE IMPEDANCE PROBE

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The automated system achieved residual errors of about .1 dB in return loss and 1° in phase after calibration.

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Summary written for general audiences

After error correction, residual errors were about .1 dB in return loss and 1° in phase. These errors correspond to about 2.5% error in dielectric constant and 12% error in loss tangent for water, and 1.7% and 2.4% for methanol. The probe technique is the only practical approach for in vivo samples but requires multiple measurements for repeatability.

Why This Matters

Interest is increasing in the use of a small monopole antenna as a probe of the dielectric properties of materials, including in vivo and simulated biological tissues. In general, phase errors primarily affect the dielectric constant and return loss errors mainly affect the loss tangent.

Cite This Study
Unknown (n.d.). AUTOMATED DIELECTRIC MEASUREMENTS WITH A SMALL MONOPOLE IMPEDANCE PROBE.
Show BibTeX
@article{automated_dielectric_measurements_with_a_small_monopole_impedance_probe_g5408,
  author = {Unknown},
  title = {AUTOMATED DIELECTRIC MEASUREMENTS WITH A SMALL MONOPOLE IMPEDANCE PROBE},
  year = {n.d.},
  
  
}
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Quick Questions About This Study

After corrections, the residual errors in the measurement system amount to about .1 dB in the return loss and about 1° in phase.
These errors would result in about a 2.5% error in the dielectric constant and 12% error in the loss tangent of water.
The corresponding values for measurements on methanol are 1.7% error in dielectric constant and 2.4% error in loss tangent.
The probe technique is the only practical approach for in vivo samples because the probe is simply inserted into or placed against the material under study, eliminating the need for precision sample holders and sample preparation.