METHOD FOR DETERMINING THE DIELECTRIC CONSTANT AND THE LOSS FACTOR OF THE INDIVIDUAL INSULANT LEVELS OF MULTILAYER PRINTED-CIRCUIT BOARDS

摘要

Method for determining the dielectric constant and theloss factor of the individual insulant levels ofmultilayer printed-circuit boards.A method for determining the dielectric constant and/orthe loss factor of insulator layers of printed-circuitboards by using test structures fitted onto or into theprinted-circuit board at measuring frequencies in the MHzto GHz range, at least one test resonator (R) beingfitted as the test structure into or onto the printed-circuit board (1), this resonator being designed as aplanar microwave line with predetermined dimensions andpredetermined position of at least one measuring point(5), in that, for each test resonator (R), its resonantfrequency (f[err]) is determined in a frequency band in whichthis resonant frequency is to be expected, and in thatthe impedance (Z[err]) at the measuring point is then deter-mined at this resonant frequency, and lastly thedielectric constant and/or the loss factor are determinedby computer from the predetermined dimensions of eachtest resonator (R) and from the determined values of theresonant frequency and of the real part of the impedanceby using the line equations.