Materials for construction...

[antenna_kid 13]

Hi, I looking for good materials to construct antenna. 
I know that PTFE is best choice. But that material isn't cheap and in my case, most important thing - isn't easy to work with it on CNC (specially thin plates 3mm to 6mm). It's to soft, it's not easy to mount on table and it's not easy to glue (I know that there are glues with primers).
What about PC, PMMA, PA, PP and others. 
I've found that PET is good choice - is that true ?

[Admin 2546]

The best material for the construction of the antennas is the sheet, thickness of 0.15-0.5mm

This is from the sheet of aluminum tin cans boxes

 

[antenna_kid 13]

yup i know but sometimes it's imposible to use such thin materials - case etc.
For example helical antenna - element which is holding helix.
I'm asking which of them has smallest impact.

I've found few publications as it's quite good material.
http://www.imeko.org/publications/tc4-2007/IMEKO-TC4-2007-188.pdf

 

[Admin 2546]

,,, good, show me such a material in practice ... !!!

For the helix antennas does not really matter dielectric material, but I think the best is Teflon , Polystyrene and the Air

[antenna_kid 13]

you have right. But sometimes we can't use them.

example:

a lot of PMMA.

It's obvious that will shift antenna characteristics. But I suppose that materials will have also impact on other properties of antenna.

[Admin 2546]

PMMA
Organic glass (plexiglass), or polymethyl methacrylate (PMMA)...???

The dielectric constant of PMMA is around 4.9....very bad

[antenna_kid 13]

https://www.researchgate.net/publication/227960359_A_Novel_Approach_of_Measuring_the_Dielectric_Properties_of_PET_Preforms_for_Stretch_Blow_Moulding

 

 

So PET, PP looks like better choice

 

[Admin 2546]

PET is better

[DeepBlueSea 0]

On 10/4/2017 at 11:21 PM, Admin said:

The best material for the construction of the antennas is the sheet, thickness of 0.15-0.5mm

This is from the sheet of aluminum tin cans boxes

 

 How To Build this Brother ? 

[Admin 2546]

,,, with great skill ... !!!

[erossutrisno 11]

On 10/4/2017 at 11:21 PM, Admin said:

sheet of aluminum tin cans boxes

How about stainless steel sir?, since it cheaper.

[Admin 2546]

,,,it"s good too...!!!

[swarg_eu 43]

Expanded Polystyrene  er 1,02-1,04  (99% air, water-resistant...)

https://www.epsindustry.org/sites/default/files/-Properties%2C Performance and Design Fundamentals of Expanded Polystyrene Packaging.pdf

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