On Thu, 13 Dec 2012 16:07:31 +0000 (UTC),
(Andrew Gabriel) wrote:


It's called a microstrip line, and they're used for several
different purposes.

It is a pcb "test coupon" - used them loads of times either on the pcb
or just outside the board edge so that the stack can be tested before
breaking out the board.
Explanation and expoded diagram he-
http://www.polarinstruments.com/support/cits/AP124.html