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S-parameters (or scattering parameters) are used to describe how energy can propagate through an electric network. S-Parameters are used to describe the relationship between different ports, when it becomes especially important to describe a network in terms of amplitude and phase versus frequencies, rather than voltages and currents. 

LTCC (Low Temperature Co-Fired Ceramic) technology is a way to manufacturer multilayer circuits from ceramic substrates. A typical LTCC device consists of multiple dielectric layers, screen-printed or photo-imaged low-loss conductors, embedded baluns, resistors & capacitors and via holes for interconnecting the multiple layers.

China’s Current Microwave Sub-band Code