Patent ID: 8203351

Claim:
A probing apparatus comprising: a plurality of substrates; a plurality of probes disposed on at least a first one of the plurality of substrates; an electrical interface to a source of test signals, the electrical interface disposed on at least a second one of the plurality of substrates; a plurality of electrical connections electrically connecting the electrical interface to ones of the plurality of probes; and wherein each of ones of the plurality of electrical connections comprises: an electrically conductive signal trace disposed on a first level of one of the plurality of substrates, and a plurality of electromagnetic shielding structures disposed proximate to the signal trace on the first level, on a second level that is different than the first level, and on a third level that is different than the first level and the second level, wherein: the signal trace is disposed between ones of the shielding structures on the first level, and the signal trace is disposed between one of the shielding structures on the second level and one of the shielding structures on the third level.