Millimetre-wave Phase Shifting Metasurface Element Enabled by Air-Bridged Schottky Diodes With Enhanced Performance

A parasitic element coupling technique is applied within the framework of this paper in order to improve the response of a tunable split patch unit cell. The initial design comprises a split patch with a Schottky diode in contact with both patches, modifying the total impedance under various bias voltages. The paramount goal of the study presented in this paper is the mitigation of losses of the resonances and increase of tuning range by exploiting the presence in the unit cell of an additional parasitic non-resonant element. As a result, the unit cell exhibits double the tuning range of the initial design with lower losses. CST Microwave Studio was used to evaluate the proposed design's tuning range and reflection characteristics.