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Electrochemical impedance spectroscopy (EIS) is a powerful tool to investigate the electrochemical processes. This work investigated the interfacial properties of ion exchange membranes using EIS. Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and zeta potential were also used to characterize the membranes. With the comparison of two equivalent circuits and the consideration...
In this paper, a center-tapped spiral transformer balun over 6.33–6.89GHz is designed by using integrated passive device (IPD) technology. EM simulation is used in the layout structure of the balun for the insertion loss, phase imbalance and amplitude imbalance. Then, a reasonable method is presented to extract the equivalent circuit of the transformer balun. It is found that the simulated results...
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