SMTA International Conference Proceedings

Electrical Performance Evaluation of High-Frequency Laminates as a Function of Temperature

Author: Brian Wright
Company: Agilent Technologies
Date Published: 10/14/2012   Conference: SMTA International

Abstract: As PCB-based electrical circuits evolve to become more precise, their electrical performance can change due to environmental conditions. This demands better understanding of PCB laminate electrical properties. As a laminate is exposed to different thermal conditions during operation, it undergoes electrical performance changes. This paper compares the electrical performance of different laminates using stripline bandpass filters. PCB materials exhibiting stable and consistent electrical performance across operating temperatures will help a circuit maintain precision.

This study measures electrical performance of stripline bandpass filters at 0°C, 25°C, and 55°C. For all three temperatures, relative humidity was kept between 0 and 5%, using dry air purge with a dew point of -100°C. Electrical performance measurements were taken using an Agilent vector network analyzer (VNA), located immediately outside an environmental test chamber. The VNA recorded S-parameters of filters located inside the test chamber. S21 measurements were used to compare filter response, and S11 measurements were used to verify proper connections and PCB manufacturing.

Key Words: 

PCB laminate material, bandpass filter temperature dependency

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