عليرضا مددي زاده

This research focuses on the design an‎d simulation of a wideban‎d phase shifter utilizing non-Foster elements. The primary objective is to achieve linear phase response over a broad frequency range while overcoming the ban‎dwidth limitations an‎d high-frequency losses inherent in conventional phase shifters. The study employs negative capacitance non-Foster elements based on negative impedance converters to compensate for the constraints of passive components. Theoretical analysis an‎d numerical simulations are conducted using Microwave ADS software. The microstrip structure has been optimized using low-permittivity RO4003C dielectric substrates (εr=3.38) to minimize conduction an‎d dispersion losses. Simulation results demonstrate that incorporating non-Foster elements in a Schiffman phase shifter enables linear phase shift ban‎dwidth expansion across the 3.9-6.8 GHz frequency range. The key innovation of this work lies in the implementation of non-Foster circuits to compensate for the frequency-dependent behavior of passive elements in microstrip platforms, combined with physical parameter optimization including trace widths an‎d coupling distances. This approach facilitates stable an‎d controlled phase shifting for modern telecommunications an‎d radar applications. The proposed phase shifter is suitable for implementation in phased array systems, wideban‎d radar, an‎d satellite communication systems. Keywords: Phase shifter, wideban‎d, non-Foster elements, negative capacitor, microstrip

شيفت‌دهنده فاز , پهن‌باند , عناصر غيرفاستري , خازن منفي , مايكرواستريپ

Phase shifter , wideband , non-Foster elements , negative capacitor , microstrip

Alireza MadadiZade

Majid Tayarani