Microwave dielectric constant of Plexiglass

- G
- galaxor
  
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posted
17 years ago

Mon, Jan 24, 2005 8:37 AM

Dear experts,
does anybody know about the (complex) microwave dielectric constant of
plexiglass in the frequency range from 10 to 100 GHz? Or where may I
find information on this?
I'd be happy about any useful comments,
best regards,
galaxor.

- M
- Martin Schoon
  
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posted
17 years ago

Mon, Jan 24, 2005 11:57 AM

I did actually characterize 'Plexiglas' for microwave applications. Not to 100 GHz though and it was some 20 years ago so I have to dig deep to find numbers.
This kind of characterization isn't *very* hard to do provided that you have measurement instruments covering the frequency range of interest. What you need to do is to adapt the procedure described in the following reference.
M. Olyphant & J.H. Ball: "Strip-Line Methods for Dielectric Measurements at Microwave Frequencies" IEEE Transactions of Electrical Insulation, March 1970, pp 26-32

- R
- redbelly
  
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posted
17 years ago

Sun, Jan 30, 2005 9:18 PM

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

formatting link

Real part of dielectric constant is 2.595 Imaginary part is 8.1 x 10^-4 x real part
At 10 GHz, from

formatting link

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

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