  Coaxial wire measurements have provided a simple and effective way to measure
the beam coupling impedance of accelerator structures for a number of years. It
has been known how to measure the longitudinal and dipolar transverse impedance
using one and two wires for some time. Recently the ability to measure the
quadrupolar impedance of structures exhibiting top/bottom and left/right
symmetry has been demonstrated. A method for measuring the beam coupling
impedance of asymmetric structures using displaced single wires and two wire
measurements is proposed. Simulations of the measurement system are presented
with further work proposed.
