Saud Aldhafyan 2025/06/24 21:45
Thank you for the feedback — I understand your point completely. You’re right
that the equipment and method used need to be clearly stated for the results
to carry weight for qualification or verification. In this case, I’m using a
calibrated Vector Network Analyzer (VNA) with an X‑band waveguide test
fixture, and the measured data for air (ε′ ≈ 1.0, ε″ ≈ ~0) is behaving as
expected across 8–12 GHz. This is mainly intended as a sanity check for the
measurement setup, not as a formal qualification.
If this data can be used as a supporting measure and the device is eventually
accepted in writing, I’m open to that and can certainly help compile the
details. I agree this approach could be beneficial for others as well, and I’m
happy you recognize the initiative. Thanks again for sharing your experience —
it’s very helpful!
> On 24 Jun 2025, at 9:01 PM, W4JDY1953_G via groups.io
<W4JDY1953=gmail.com@groups.io> wrote:
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> On base as we work with them.
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> Not to be a party popper, but you tell them what you used to measure with
and this report does not qualify the test device.
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> Been through this before.
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> But if they accept these measurements and accept the device in writing, that
will help others here and perhaps I can backdoor UL and 3 other metrology labs
used by the USG and DoD.
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> Great to see you take the initiative.
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> W4JDY
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> **From:** NanoVNAV2@groups.io <NanoVNAV2@groups.io> **On Behalf Of** gary
miller via groups.io
> **Sent:** Sunday, June 22, 2025 6:07 PM
> **To:** NanoVNAV2@groups.io
> **Cc:** NanoVNAV2@groups.io
> **Subject:** Re: [nanovnav2] Validation of Dielectric Constant
Measurements: A Case Study with Air in the X-Band
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> Please see attached reference and data for dry nitrogen.
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> <image001.jpg>
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>> On Jun 22, 2025, at 09:00, Saud Aldhafyan via groups.io
<[Aldhafyans=gmail.com@groups.io](mailto:Aldhafyans=gmail.com@groups.io)>
wrote:
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>> I am conducting measurements of the dielectric constant of air in the
X-band frequency range (8-12 GHz) as a method to verify the accuracy of my
measurement setup. I've generated a graph of my results, but I've had
difficulty finding comparable data or confirmation in existing literature.
Could you please review my graph and provide feedback on its correctness,
particularly regarding the expected behavior of the dielectric constant of air
at these frequencies?"
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