Journal of SMT Article
EVALUATING THE EFFECT OF SOLDER PASTE RESIDUES ON RF SIGNALS BETWEEN 5 AND 10 GHZ
Company: University of Toronto
Date Published: 1/1/2004 Volume: 17-1
This paper presents a new method of characterizing the effect of solder paste residues on RF signals between 5 and 10 GHz with the use of Ansoft HFSS full-wave electromagnetic simulations and insertion loss measurements. A microstrip T-Resonator circuit was designed as the test vehicle of choice because resonant frequencies near 5 and 10 GHz can be achieved without unwanted coupling effects. The test vehicle was built with a low-loss substrate (Rogers 4350) and featured an ENIG surface finish.
Optical and scanning electron microscopy techniques were used to obtain solder fillet and residue dimensions needed as input to the model. Insertion loss measurements were obtained for samples processed with several different solder pastes, both after processing and after aging at 85oC and 85% RH for 14 days. Five different no-clean solder paste formulations were tested, and the effect of their residues on RF signal propagation was characterized.
Key words: solder paste, residues, RF, signal propagation.
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