SMTA International Conference Proceedings


The Impact of Final Plated Finishes on Insertion Loss for High Frequency PCBs

Author: John Coonrod
Company: Rogers Corporation
Date Published: 9/17/2017   Conference: SMTA International


Abstract: Many different final plated finishes are used in the PCB industry and each has its own concerns related to insertion loss. The impact of loss for an applied finish is generally dependent upon frequency, circuit thickness, and circuit design configuration. The circuit designs considered in this paper will be based on microstrip transmission lines and two different versions of grounded coplanar waveguide (GCPW). Loss vs. frequency data will be given for these circuit configurations, for six different plated finishes commonly used in the PCB industry. Loss is also dependent upon substrate thickness, so circuits using different substrate thicknesses will be evaluated to also evaluate the impact of different plated finishes on insertion loss when the substrate thickness changes.

Discussion regarding frequency dependent losses for different plated finishes will be given, as well as different substrate thicknesses and the impact these variables have on insertion loss.

Test results will be generated across a wide range of frequencies. Depending on the circuit design and configuration, there will be insertion loss data given from 10 MHz up to 25 GHz, other designs will be capable of higher frequencies and will range up to 50 GHz and a few designs will be tested to 110 GHz.

Key Words: 

Insertion loss, plated finish, high frequency, microstrip, grounded coplanar waveguide



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