Short-Open Calibration (SOC) Technique for Unified Circuit Representation of Microstrip-Red Slot Antennas

Unified and complete circuit model is formulated for accurate representation of a large variety of microstrip (MS)-fed slot antenna with arbitrary width and shape. It is realized by applying a so-called "short-open calibration" (SOC) technique that numerically calibrates (deembeds) the Y-matrix parameters calculated from our full-wave method of moments (MoM). The unifled model consists of an equivalent series impedance standing for the slot radiation and a pair of parasitic shunt susceptances. Three types of MS-fed slot antenna are theoretically characterized to verify our proposed model, and their circuit behaviors are also shown in the context of different slot width and shape.