VGTU Phase I Report (2016): Spectrum Analyzer Testing Shows 27% Average Reduction in Electric Field Strength Across 0.9–2.5 GHz EMR

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VGTU Phase I Report (2016): Spectrum Analyzer Testing Shows 27% Average Reduction in Electric Field Strength Across 0.9–2.5 GHz EMR

By Dainius Jasaitis, Prof. Artūras Jukna, VGTU

VGTU Phase I Report (2016): Spectrum Analyzer Testing Shows 27% Average Reduction in Electric Field Strength at 0.9–2.5 GHz

Independent laboratory testing at Vilnius Gediminas Technical University (VGTU) Photovoltaic Technology Laboratory. Three Aires EMR resonator-converters tested across 0–8 GHz using Signal Hound Spectrum Analyzer, with sources from 0.5 W to 800 W. Key result: 27% average electric field reduction.

Laboratory testingSpectrum analyzer0–8 GHz bandElectric field strength27% field reductionVGTU Photovoltaic Lab2016
27%
Average field strength reduction at 0.9–2.5 GHz
0–8 GHz
Test frequency band
0.5–800 W
Transmitter power range
3
Resonator models tested

Testing Institution and Context

This Phase I report was commissioned by UAB AIRESLITA (Vilnius) and conducted at the Laboratory of Photovoltaic Technology, Sauletekio av. 3, Vilnius — a certified research facility of Vilnius Gediminas Technical University (VGTU). Laboratory head: Dainius Jasaitis. Physics department consultant and head: Prof. Artūras Jukna.

Context: Lithuanian Hygiene Standard HN 80:2015 sets permissible EMR power density at 10 μW/cm². Household devices routinely approach or exceed this threshold in close-proximity use. The testing aimed to quantify how Aires resonator-converters affect the measured electric field strength of common 0.9–2.5 GHz EMR sources (mobile phones, Wi-Fi routers) in both transmission and reflection measurement modes, across far-field (distance >10λ) and near-field (distance <10λ) zones.

Devices Tested

Aires Black Crystal

Self-affine circular diffraction grating resonator; antenna-coupled; tested at 900 MHz–2.5 GHz

Aires Shield

Self-affine resonator; tested in both optical transmission and optical reflection configurations

Aires Defender

Larger-format self-affine resonator; tested across full 0–8 GHz band including far-field measurements

Test Methodology

Testing was conducted in the VGTU laboratory at room temperature, using the Signal Hound Spectrum Analyzer (100 Hz–8 GHz) operating with FFT analysis of pulsed signals. Measurement accuracy: ±1.0 dB at 50 MHz–1.9 GHz; ±2.4 dB at 1.9–35 GHz; isotropic deviation: ±1.0 dB.

Two measurement configurations:

  • Optical transmission mode: Resonator-converter placed between transmitter and receiver; residual signal at receiver measured with and without RC in line
  • Optical reflection mode: Resonator-converter placed with one face toward both transmitter and receiver; reflection-side field measured

At each fixed receiver position, the transmitter was gradually moved to different distances, allowing field strength vs. distance profiles to be established with and without the resonator-converter. Power levels: 0.5 W (Transmitter 1), 2 W (Tx2), 400 W (Tx3), 800 W (Tx4). High-power transmitters were used to minimize measurement error. All measurements were conducted per Lithuanian Hygiene Standard HN 80:2011.

Results

Key result — 27% field strength reduction: During interaction with the resonator-converter, the electric field strength of incident 0.9–2.5 GHz electromagnetic waves decreases by 27% on average (grey curve in the report’s Fig. 5 — E₀ vs. ER-C). This was measured as ΔE = E₀ − ER-C at fixed spatial points with the RC placed directly in front of the transmitter in optical transmission mode, and confirmed across all tested transmitter power levels (0.5–800 W).
Bandwidth redistribution: Beyond simple amplitude reduction, the spectrum analyzer revealed changes in the bandwidth of the signal post-interaction with the RC. FFT analysis of pulsed signal components showed redistribution of spectral energy across frequency, consistent with the theoretical prediction from the MEMS simulation reports: the self-affine diffraction grating transforms the incident wave into a coherent multi-frequency superposition rather than simply attenuating it.
Far-field and near-field both measured: Measurements were taken at both far-field (>10λ from source) and near-field (<10λ from source) distances, covering the practical range of human exposure from typical household device use. Both zones showed measurable interaction effects from the resonator-converter.

Independent Testing and Theoretical Partner

The VGTU Photovoltaic Technology Laboratory functioned as the independent experimental testing partner. Prof. Gennadi Lukyanov (ITMO University, St. Petersburg — the same institution that contributed to the 2026 thermal imaging paper) was designated to conduct theoretical simulation of the experimental results as part of the project collaboration. This established the long-term VGTU-ITMO-Aires research partnership that has continued through subsequent studies.

Conclusion and Further Plans

Phase I established the baseline measurement framework and confirmed that the Aires resonator-converters produce a statistically significant, measurable effect on incident EMR fields in the 0.9–2.5 GHz range — a 27% average reduction in electric field strength. Phase I identified which RC characteristics were most suitable for further testing and provided the specification basis for subsequent Phase II and multi-stage testing programs.

Laboratory: VGTU Photovoltaic Technology Laboratory, Vilnius  |  Head: Dainius Jasaitis  |  Consultant: Prof. Artūras Jukna  |  Year: 2016

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