RE: [SI-LIST] : Coplanar Transmission Line

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From: E Montgomery (e_montgomery@littoninterconnect.com)
Date: Fri Feb 04 2000 - 09:41:16 PST


My recent message had a missing attachment.
Here it is.

-Jian

>Loss on a transmission line is mainly
>determined on the percentage of the E
>field in lossy dielectrics. A bitmap
                             ^^^^^^^^^
>picture is attached to this e-mail to
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>illustrate the cross-section of microstrip
>and CPW (co-planar waveguide). For microstrip,
>most of the field (significantly more than 50%
>of the field) is concentrated between the strip
>and the ground or the substrate. For CPW, about 50%
>of the field will be in the air and the rest is in
>the substrate. In fact, if the substrate is thin, more
>than 50% of the field will be in the air (see the
>attached picture). There is no doublt about it that the
>dielectric loss is lower on CPW.



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