Shielded probe for high-frequency testing of a device under test
View Patent ↗A shielded probe for measuring the electrical characteristics of integrated circuits or other microelectronic devices at high frequencies. The probe may include a probe tip that extends through a dielectric substrate that supports on a first surface a signal path to test instrumentation and on a second surface a ground path that shields both the signal path and the probe tip.
1. A probe comprising:
(a) a dielectric substrate having opposed first and second surfaces and a thickness of less than 40 microns and a dielectric constant of less than 7;
(b) an elongate conductor supported by said first surface and suitable to be electrically interconnected to a test signal supported by a first side of said substrate;
(c) a conductive member supported by said second surface and suitable to be electrically interconnected to a ground signal supported by said second side of said substrate wherein said conductive member is under a majority of the length of said elongate conductor;
(d) said elongate conductor extending through said dielectric substrate to extend beyond said second surface which surrounds a cross-sectional periphery of said elongate conductor, said elongate conductor free from electrical interconnection with said conductive member and terminating in a contact for testing a device under test.