Patent ID: 8069491

Claim:
A calibration substrate for calibrating a probe comprising: (a) a planar first conductive member supported by said substrate suitable to be electrically interconnected with a first signal path of said probe; (b) a planar second conductive member supported by said substrate suitable to be electrically interconnected with a second signal path of said probe; (c) a planar third conductive member supported by said substrate suitable to be electrically interconnected with a ground path of said probe; (d) a planar fourth conductive member supported by said substrate suitable to be electrically interconnected with a first signal path of another probe; (e) a planar fifth conductive member supported by said substrate suitable to be electrically interconnected with a second signal path of said another probe; (f) a planar sixth conductive member supported by said substrate suitable to be electrically interconnected with a ground path of said another probe; (g) wherein said third conductive member and said sixth conductive member are spaced apart from one another, and a resistive material supported by said substrate at least partially extends between said third conductive member and said sixth conductive member, wherein the S11 characteristic from said first, second, and third conductive members has a loss of less than 0.05 dB between 30 GHz and 50 GHz.