Tim Lesher

Optimized impedance standard substrate designs for dual and differential applications

Optimized dual signal Impedance Standard Substrate (ISS) designs are demonstrated. The optimal designs had loop-under grounds, were selected for minimum deviation from lumped element behavior and used mode dampening structures. A comparison of existing design approaches is given and the quality of the designs is illustrated to 50 GHz.

A high isolation dual signal probe technology

In this paper, we describe a new dual signal probe, and vector network analyzer (VNA) calibration standards providing high isolation between signals. Previously existing probes and standards may exhibit high coupling, making them unsuitable for use with conventional VNAs. The new design significantly reduces the signal-to-signal coupling of the probes and standards, enabling improved calibration and measurement to beyond 40 GHz.