[SI-LIST] Re: References on electrical properties of dielectric materials?
- From: Larry Zu <larry.zu@xxxxxxxxxxxxxxxx>
- To: jeff.loyer@xxxxxxxxx
- Date: Wed, 21 May 2014 23:19:11 -0700
Hi Jeff,
Your operating frequency is 4 GHz. I guess if you lower this frequency to
2.450 GHz, you will see an insertion loss difference between a dry sample
and a moist sample. The 2450 MHz frequency is the microwave oven
frequency. It heats up water molecules inside a food/material very
efficiently. In another word, the absorption or EM wave attenuation
(insertion loss for moist dielectric material) is higher at 2.45 GHz. At 4
GHz, little energy is absorbed by water molecules inside the dielectric
material. This is a quantum mechanics effect. I could be wrong.
For "low loss dielectrics responded to temperature changes significantly
less than standard FR4", could you elaborate more?
Thanks.
Larry Zu, Ph.D.
Sarcina Technology LLC
Semiconductor package design and simulation
On Wed, May 21, 2014 at 1:28 PM, Loyer, Jeff <jeff.loyer@xxxxxxxxx> wrote:
> Sorry - link got munged.
> https://www.filesanywhere.com/fs/v.aspx?v=8b6d648f606672ae9ca5
>
>
> Jeff Loyer
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Loyer, Jeff
> Sent: Wednesday, May 21, 2014 1:21 PM
> To: si-list (si-list@xxxxxxxxxxxxx)
> Subject: [SI-LIST] References on electrical properties of dielectric
> materials?
>
> Does anyone know of good references explaining the relationship between
> dielectric materials and their electrical properties? For instance,
> exactly what in their chemical makeup makes their Er higher? Similar
> question for Df. I'd prefer some which assume only "novice" knowledge of
> chemistry ("Material Properties - Simplified"? :))
> I'm trying to understand this better since our work on environmental
> effects seems contrary to my expectations. For instance, we found that the
> increase in loss due to temperature increase was the same for dry and moist
> samples - I would have expected it to be different (though I'm not sure in
> which direction).
>
> We also found that low loss dielectrics responded to temperature changes
> significantly less than standard FR4 - I'd like to understand why.
>
> For more information about these environmental effect findings, please see
> the link below (temp, humidity effects)
> https://www.filesanywhere.com/fs/v.aspx?v<6d648f606575a76e9e
>
> Thanks in advance,
> Jeff Loyer
>
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