The Estimation of Cable Input Impedance Through Analytical Techniques

In this paper, two analytical techniques for computing the input impedance of cables are introduced. Given the pivotal role of the SMA connector in altering cable input impedance, it is essential to account for the significant effect of the connector in the impedance calculations. This effect is addressed through the use of two models for the connector, namely the circuit model and the cascade model. These analytical techniques can be applied to various cables, provided that the impedance of the cable up to the connector is known, and the impact of the connector on the input impedance is appropriately considered by the models.