Título: FDTD simulation of a coaxial reactive calibration standard.
Resumen: This paper presents a procedure to simulate an open-circuit coaxial reactive calibration standard having whole axial symmetry. The simulation is carried out on a planar microstrip equivalent circuit representing the coaxial standard. A two-dimensional (2-D) finite-difference time-domain (FDTD) method is used to reach this purpose. The lumped equivalent circuit inductance and capacitance of an undetermined planar circuit are used to define the characteristic impedance of the microstrip circuit. The open-circuit termination is first approximated by a middle-large impedance to obtain an initial uncompensated response, which will subsequently be compensated by means of a factor attained from a transmission line circuit analysis. Then, a second open-circuit approximation is reached when a zero current density and a source potential are stated at the microstrip output cells giving a more realistic straight response. Both, the direct and the compensated responses are compared to a measured response showing a good agreement among them.
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