Thanks a lot for the information
Actually, I only have a couple
of DUTs to measure. I think it may be very difficult
to solder a short section of small semi-rigid coax
to the board for measurement, since our DUTs are
so miniature that it may not have enough space for
soldering. The distance between two adjacent ports
is about 36mil=0.9mm on the same side (as indicated
in the picture above), and the distance between
adjacent port is about 164mil=4.2mm on two adjacent
sides, which is the same as the DUT's length.
For the test fixture in your reply, it might
be not proper for our measurement for the same reason
that our DUT is too miniature. I checked the specifications
of this test fixture. It requires that minimum length
of DUT is 9mm and minimum width of DUT is 2.5mm.
What do you think of this? Or could you please
offer some suggestions? Thank you so much!
If you only have a couple
DUTs to measure, then you can probably solder
a short section of small semi-rigid coax to
the board that has an SMA on the other end.
I've had great success with that up into the
6 GHz region (could probably go higher, butI've
never needed to).
For measuring a large
number of DUTs, a fixture will be necessary.
I've never used one myself, but I see that a
company called Gigalane has a productio quality
fixture for measuring your type of PCB.