Three section termination for an R.F. triaxial directional bridge

A wide bandwidth R.F load having a substantially constant impedance over a range of frequencies comprising:

• an input port;
• a first and second conductor coupled to said input port;
• a first distributed load which is distributed along and between said first and second conductors, said distributed load having an inner taper and an outer taper with said inner taper comprising a first material having a first inner dielectric constant and a first inner attenuation coefficient and said outer taper comprising a second material having first outer dielectric constant and a first outer attenuation coefficient, with said first inner dielectric constant being smaller in magnitude than the magnitude of said first outer dielectric constant and said first inner attenuation coefficient being smaller in magnitude than the magnitude of said first outer attenuation coefficient;
• a lumped load coupled to said distributed load opposite said input port;
• and
• a second distributed load coupled to said lumped load opposite said distributed load relative to said lumped load, constructed of a lossy material having a magnetic permeability which is substantially larger than the magnetic permeability of both said first material and said second material.