The computational values are required to set up the type of structure and target component values. Thus, going from normalized impedance to normalized admittance corresponds to a 180 degree shift. In-situ RF lab measureme nts, along with tuning work, have to be consid ered for determ ining the proper final values. Moving along a lossless transmission line toward the generator corresponds to moving clockwise along a constant SWR.

The matching task is required for a proper transfer of signal and energy from a 'source' to a 'load.' At high radio frequencies, the spurious elements (like wire inductances, interlayer capacitances, and conductor resistances) have a signif icant yet unpredic table impact on the matching network. When the Smith chart is used as an admittance chart: the upper half plane is the capacitive region, corresponding to Im(z)<0 and Im(y)>0 the lower half plane is the inductive region, corresponding to Im(z)>0 and Im(y)<0.

Typically these incl ude the antenn a to the low-noise amplifier (LNA), power- ampli fier output (RFOU T) to the antenna, and LNA/VCO output to mixer inputs.

One is the need to match the different impedances of the interconnected blocks. When dealing with the practical implementation of RF applications, there are always some nightmarish tasks.

Admittance smith chart pdf