RE: [SI-LIST] : even-odd mode influence

[email protected]
Mon, 19 Jul 1999 20:23:00 -0400


You mention that material dominates losses on microstrips, is this no
longer true with embedded microstrips? Is this statement true with
stripline constructions as well? I would expect it to be so.

Thanks for sending such excellent information.

Chris Heard
3Com Corp

"WAUGH,RAY (HP-SanJose,ex1)" <[email protected]> on 07/19/99
07:05:05 PM

Please respond to [email protected]

Sent by: "WAUGH,RAY (HP-SanJose,ex1)" <[email protected]>

To: "'si-list'" <[email protected]>
cc: (Chris Heard/US/3Com)
Subject: RE: [SI-LIST] : even-odd mode influence

The measurements I made on FR4 (and three other lower cost materials) were
made on microstrip lines which were five to eight inches long. What we (my
colleague Dan Swanson and I) did find is that microstrip line losses are
dominated by losses in the dielectric (rather than in the copper
conductors). As a consequence, the loss tends to be a fixed number when
expressed as dB/wavelength. See the attached PDF file.
At 10 GHz, an 18 inch FR4 microstrip line is going to be a bit lossy.
_/ Raymond W. Waugh - WSD Diode Applications
_/ E-mail: [email protected]
_/_/_/ _/_/_/
_/ _/ _/ _/ USPS : Wireless Semiconductor Division
_/ _/ _/_/_/ 39201 Cherry Street, MS NK20
_/ Newark, California 94560
-----Original Message-----
From: Stephen Zinck [mailto:[email protected]]
Sent: Monday, July 19, 1999 9:39 AM
To: [email protected]
Subject: Re: [SI-LIST] : even-odd mode influence

How long was the transmission line on this board? Have you had any success
with transmission lines on the order of 18" long (@ 10 GHz) using FR-4?
Just curious.

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