Does anyone know dielectric constand for PEBAX?

It's "low" >:-}

This website has it, but you have to "create an account"...

...Jim Thompson

-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

A search on PEBAX + permittivity turned up a few things, e.g.

. Looks like about 13 at low frequency and 3 at 1 MHz. Yecch.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 USA 
+1 845 480 2058 

hobbs at electrooptical dot net 
http://electrooptical.net

Ya well, I entered all my stuff and when clicking on create account nothing happens. Many web site designers aren't worth their salt these days.

It's unbelievable but in some such cases I actually have to get a sample and measure.

--
Regards, Joerg 

http://www.analogconsultants.com/

Thanks, didn't think about the word permittivity because that was never used at my schools. 13 would be ugly. The question is where does it begin to rise? I need to operate in the 150-400kHz range. Maybe I just assume 4 and knock on wood :-)

--
Regards, Joerg 

http://www.analogconsultants.com/

Given that it's a polyamide block copolymer, I'd be concerned about water absorption. (Think nylon.)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 USA 
+1 845 480 2058 

hobbs at electrooptical dot net 
http://electrooptical.net

Agreed. My chemistry knowledge says it should behaves something like nylon. Not sure what the polyether part would do, electrically, but hey, it's in the ballpark. :) That would put the loss tangent around 1% and K around 4 or so. You wouldn't want to take it into the microwave, but I doubt it'll melt from 400kHz applied to bulk material.

Tim

--
Deep Friar: a very philosophical monk. 
Website: http://seventransistorlabs.com

It ain't my choice, and it's actually going into the blood stream. It's a sheath, a standard medical utensil in the world of catheters that goes in before anything else does. I already dread the lead vests during clinicals, those give me a back pain.

Note to self: Must lose weight before that.

--
Regards, Joerg 

http://www.analogconsultants.com/

I'm not sure what sort of polyether it is. My only experience with polyethers is with polyethersulfone, which is incredibly horrible stuff if there's any water around. If you try solvent-casting it, it makes a block structure with the water, i.e. it turns to very very fine pore foam. On the plus side, that's how most inexpensive ultrafilters are made--you just stir a bit of water into your PES+solvent mixture, and you can make a huge filter with very uniform ~20 nm pore sizes.

I discovered this independently while trying to find a material for a three-layer resist system for building antenna-coupled infrared tunnel junctions. Polyethersulfone worked beautifully the first time I tried it, on a cold day in January, when the indoor humidity was probably in the single digits, and never worked again. :(

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 USA 
+1 845 480 2058 

hobbs at electrooptical dot net 
http://electrooptical.net

El viernes, 1 de febrero de 2013 02:22:59 UTC+1, Joerg escribió:

Hello Joerg,

You may visit matweb

Depending on chemistry (formulation) Dielectric Constant seems to vary betw een 4 and 9.5 (general page on PEBA on matweb).

--
Wim 
PA3DJS 
www.tetech.nl 
Please remove abc first in case of PM

Move to Spain for the winter to escape the cold? :-)

Hmmm ... where did you find the dielectric constant in there?

--
Regards, Joerg 

http://www.analogconsultants.com/

I copied the wrong link...

The general data is in:

It mentions 4 to 9.5

From the list of products, click on of the products with the red dots (EMS Grivory).

This will show you product data.

You are right, the wheater in Spain is better then the rain over here (around 20 degr. C. in Malaga).

--
Wim 
PA3DJS 
www.tetech.nl 
Please remove abc first in case of PM

Datasheet E-mailed to you.

I didn't have any problems creating an account using a temporary E-mail address which I then deleted from my forwarding system >:-} ...Jim Thompson

-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Thanks, Jim. Got it.

--
Regards, Joerg 

http://www.analogconsultants.com/

I think I'll assume 7 for now and call it a day. If I provide enough margin in the calcs it should be ok.

Says "only available to premium members".

Wish I was there ...

--
Regards, Joerg 

http://www.analogconsultants.com/