GHz / Coaxial Interconnects
Fuzz Button® technology is already inherently capable of 40GHz+ frequency performance.
But, when a customer's device package and/or boards are able to accept it, Fuzz Buttons® can
be arranged in a coaxial pattern for even better impedance matching, especially when targeting
50 Ohms impedance. In this optimized configuration, there is a central Fuzz Button® for the
signal path and four to six surrounding Fuzz Buttons® arranged in a circle or semi-circle around
it to provide compliant grounds. The recommended material for the substrate carrier in such an
arrangement would be a high-grade dielectric plastic, such as Ultem® 1000 or Teflon® PTFE,
which would provide sufficient isolation between the array positions. This coaxial pattern option
can be incorporated into any of our products, including PCB interposers, test sockets and
interconnects. Hardhats can be included in the stackup of such a coaxial structure, dependent
on a requirement for high mating cycles.
Fuzz Button® RF Optimization
Many customers are looking to maximize the ground plane to further reduce signal parasitics.
For these kinds of applications there is a variant of the coaxial structure in which the interposer
or socket body is machined from a highly conductive material such as Aluminum or Brass. The
circular coaxial pattern as earlier described is again employed, but this time the central signal
Fuzz Button® is encased in a dielectric isolating/insulating sleeve (often Ultem® 1000 or
Teflon® PTFE) which is then press-fit or slip-fit into the metal body. The four to six surrounding
Fuzz Buttons® are inserted directly into machined holes within the metal body to become
compliant grounds. Although technically more challenging and costly than our other designs,
when RF performance matters most, this is the most rewarding approach.
Fuzz Buttons® ...how high do you want to go?
Custom Interconnects, LLC
7790 E. Arapahoe Rd, Suite 250
Centennial, CO 80112
For GHz / Coaxial Datasheet,
please click on any of the pictures