Full‐wave analysis of superconducting microstrip for MMIC applications

Abstract

In this article we take into account the influence of the superconducting nature of the strip in order to study the behavior of the superconducting microstrip line by means of two numerical methods. The first one is the spectral domain approach modified by the surface impedance concept and the second one is the modified mode‐matching technique. This last one allows more accurate simulation of the presence of the superconducting strip without using surface impedance approximation. In a second step we present the corrections brought to the modified SDA in order to obtain accurate results by this more versatile numerical method, which consumes small amounts of CPU time.

Conductor loss on transmission lines in monolithic microwave and millimeter‐wave integrated circuits

“…Strictly speaking, however, that condition is fulfilled only in the case f << 6, which may lead to inaccuracies if t 4 6 is violated (see ref. 15). Sec-ond, the so-called "phenomenological loss equivalence method" has been brought up [16,17].…”

“…One example, a mode-matching technique, will be described in the following section. Other groups [15,22,23] use essentially the same method. Also, the Method of Lines [24], the Finite-Difference Method [25], and the Boundary-Integral Method [26] have been applied successfully hitherto for the analysis of planar waveguides including metallic loss.…”

Finite‐element analysis of superconducting microstrip line for mmic applications

“…Moreover, with this kind of method, any information on the behavior of the electromagnetic field inside the strip cannot be obtained. It has been proved that the modified mode-matching technique makes this last point possible and can take into account with more accuracy the electromagnetic behavior of the superconducting strip [ 2 ] . Nevertheless, a modified mode-matching technique could hardly be extended to an arbitrary shape or inhomogeneous strips.…”

“…In order to calculate the bit error probability the symbols are assumed to be associated to the constellations in the Stokes space minimizing the distance between first neighbors, which are reported in [2]. Moreover T, = 1 / N is assumed.…”