Re: Microwave dielectric constant of Plexiglass

From: redbelly (redbelly98_at_yahoo.com)
Date: 01/30/05 

Date: 30 Jan 2005 13:18:17 -0800

galaxor wrote:

> does anybody know about the (complex) microwave dielectric
> constant of plexiglass in the frequency range from 10 to 100 GHz?

You can do searches on acrylic, polymethylmethacrylate, and PMMA
(different names, same material). I think Lucite is also the same
stuff.

For acrylic @ 100 GHz, from
http://www.ovro.caltech.edu/~lamb/ALMA/Receivers/mmMaterialProperties1.pdf
:
Real part of dielectric constant is 2.595
Imaginary part is 8.1 x 10^-4 x real part

At 10 GHz, from
http://www.loqnl.ufal.br/publications/2002/artigo32002h.pdf
Dielectric constant is 2.59 (no mention of imaginary part),
and they refer to:
AIP Handbook, 3rd ed., edited by D. E. Gray ~McGraw-Hill, New York,
1972, Sec. 5, p. 132.

Hope that's a useful start.

Mark