The equivalent source reconstruction (ESR) method for reconstructing a set of auxiliary sources in the radiating antenna is a rather old idea. However, here – for the first time – ESR is based on field measurements in the close reactive near field, which preserves the characteristics of the purely reactive components that would be lost in measurements at greater distances. We have rigorously validated Module mmWave V3.2 for evaluation of power density (PD) at distances as close as λ/25 to the device under test (DUT), i.e., 2 mm at 6 GHz.
In recent months, we have further generalized the implementation of ESR in DASY8/6 Module mmWave, automated the grid selection, and verified the quality of the conversions. These improvements mean that V3.2 is now robust for measurements at frequencies up to 110 GHz and can be used by operators with no intrinsic knowledge of the method.
During the October 2022 Telecommunication Certified Body (TCB) Council Workshop, the US Federal Communications Commission (FCC) confirmed that the ESR method is approved for assessment of the PD of mobile devices operating in the 6 – 8.5 GHz frequency range.
SPEAG will continue to collaborate closely with national regulators to further extend the validity range of the ESR method. In the next release, we will add incident PD evaluations conformal to the device surface and further reduce the reconstruction time.
At the request of customers and regulators, we have also developed the new RP6500V1 coaxial-fed rectangular patch verification source operated at 6.5 GHz for system checking of PD and absorbed power density (APD) systems in the Wi-Fi 6 GHz bands. The validation results are available in this report. The RP6500V1 will become available to our DASY customers in March 2023 for on-site validation of the PD / APD setups.
The DASY8/6 Module mmWave V3.2 software installer and manual are available for download on our website.
If you have any suggestions or would like to receive further information, please contact us at firstname.lastname@example.org.
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