Adverse Side Effects of Noise given rise to Vector Network Analyzer (VNA)

Network analysis is the system by which designers and manufacturers measure the electrical performances of the complex systems used in components and circuits. When these systems are transmitting signals with information content, we are most concerned with getting the signal from one point to another with minimum distortion and maximum efficiency, [7]. Efficient transfer of power is another fundamental concern in communications systems. In order to efficiently convey, transmit or receive HF power, devices such as antennas, transmissions lines and amplifiers must present the proper impedance match to the signal source. Impedance mismatches occur when the real and imaginary parts of input and output impedances are not ideal between two connecting devices. Vector Network Analysis is a method of accurately characterizing such components by measuring their effect on the magnitude and phase of swept-power and swept-frequency test signals, [8]. In this paper, the work is focused on the determining of the noise influences, generated by VNA, during calibration S parameters in the goal to minimize the distortion and the effects of random errors.