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Smart and quick Dk, Df extraction flow of halogen-free and lead-free materials under different temperatures
Keywords: dielectric constant, loss tangent, halogen-free
Halogen-free and lead-free materials are eco-friendly and the main trend in the long run. Recently, a lot of electronic gadgets including not only mobile phones but relevant accessories have been gradually made of this kind of material in place of traditional formulas to comply with the compliance by European Union. However, there are many drawbacks about halogen-free and lead-free materials such as mechanical reliability and thermal issues which will cause the failure in use. Besides, electrical property is another inevitably critical problem. Not a few of electronic devices are needed to operate under different environmental temperatures stemming from different locations or the heat generated itself. Different ambient temperatures can affect the normality of each material used within the device and further influence the whole function. Therefore, correct and quick extraction of electrical parameters of the material is desirable in the development of high speed application easily influenced by the variation of temperature to conform to the requirement of higher precision of parameters and lower-cost expectation. Based on this reason, the main purpose of this paper is to set up a procedure which can provide an easy and reliable calibration and measurement of vector network analyzer (VNA) accompanies with thermal cycle oven to satisfy the users who want to get these electrical parameters in short time. Dielectric constant (DK) and dissipation factor (DF), the most two important electrical parameters, have been quickly analyzed in planar-circuit methods and processed by the programs designed by ourselves under ambient temperatures ranging from -40 to 85 degree Celsius. The results of measurement reveal that DK and DF of the halogen-free and lead-free material among these interest temperatures are 4.2-4.9 and 0.016-0.029, respectively. It is worth noting that the methodology and procedure aforementioned are also suitable for the other materials, not just confined to the halogen-free and lead-free.
Chang-Chih Liu,
Industrial Technology Research Institute
Chutung,Hsinchu, Taiwan

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