Question on low loss substrate?

[amanda.]

Hi friend,

What is low loss substrate?

I'm seeking this kind of material for antenna design, anybody mind to list down some low loss substrate that available in the market?:wink:

Thank you.

 

[vfone]

The loss tangent is a metric of the quantity of electrical energy which is converted to heat by a dielectric. Low loss of the material maximizes the antenna efficiency.
Here is a nice chart for losses of different dielectric materials:

**broken link removed**

 

[biff44]

You can't beat suspended stripline for loss.

 

[amanda.]

Thank you for the comments,

Is the Duroid substrate can be consider as a low loss substrate?
So what is suspended stripline?

 

[vfone]

Yes, Duroid is a very low loss substrate.
Suspended stripline technology is mainly used in high frequency transmission lines, due to higher Q and lower loss than standard strip or microstrip lines.

 

[amanda.]

Hi vfone,

Thanks for explain.

Is there any advantages of using substrate?

 

[mkonca]

substrate gives you structural integrity. if you want to increase your efficiency you can also have a regular microstrip antenna without the back (ground conductor) but suspend it over a sheet of metal which will act as the ground.

 

[amanda.]

Hi mkonca,

Thanks for explain.