A High-Gain, Low CRR, Narrow beam width Enhanced Vivaldi Antenna for Through-the- Wall Imaging Radar

This study presents an optimized ultra-wideband (UWB) Vivaldi antenna engineered for high gain, narrow beamwidth, and superior impedance matching, specifically designed for Through-the-Wall Imaging Radar (TWIR) systems. Fabricated on a cost-effective ۰.۸-mm-thick FR-۴ substrate with dimensions of ۱۴۸ mm × ۸۵ mm, the antenna incorporates ten open-ended rectangular slits on each arm of the exponentially tapered slot and nine metallic strips at the slot’s end. Through extensive parametric optimization and precise positioning, this configuration uniquely enhances gain by ۵۱% at lower frequencies and ۳۵% at ۴ GHz compared to conventional designs, peaking at ۱۲.۵۹ dBi. Operating across ۱.۹ to ۴.۵ GHz, it delivers gains exceeding ۷ dBi from ۲.۳ to ۴.۵ GHz and a narrow beamwidth down to ۲۹.۳° at ۴ GHz. Validated by CST Microwave Studio simulations and measurements, this antenna outperforms existing TWIR-focused Vivaldi designs in penetration and resolution, making it an exceptional candidate for advanced radar imaging applications.

کلیدواژه ها:

TWIR ، Vivaldi antennas ، Tapered Slot Antennas ، Microwave Imaging