Compact Modeling for Average Power Handling Capabilities of Symmetric and Asymmetric Striplines

In this article, a compact modeling for the average power handling capabilities (APHCs) of symmetric and asymmetric striplines is investigated. According to the principle of conformal mapping technique, the striplines are transformed into parallel-plate rectangular structures. The thermal resistances of the striplines are calculated straightforwardly by this means. The temperature rises and APHCs of the striplines are obtained through the equivalent thermal circuits, where different thermal boundaries, as well as the impact of temperature-dependent resistivity of the metal strip, are taken into account. The validity of the equivalent thermal circuit is demonstrated through electrothermal co-simulation of striplines with different substrates and geometries. The results of the proposed model are in good agreement with those obtained by the commercial software.