scope:

This procedure outlines a test method to determine the permittivity (dielectric constant or E'r) and loss tangent (dissipation factor or Tand) of printed wiring materials at various frequencies (from 1 MHz to 1.5 GHz) using a single test fixture for the measurement. The permittivity and loss tangent are measured using a narrow sweep of frequency around the target or desired frequency. The test method is built around the capability of currently available materials analyzers, which use a capacitance method to determine permittivity. This test method is not intended for low loss materials, such materials may be tested at fixed frequencies using other IPC test methods.