volume | PIER Journals

Abstract

This paper proposes a high-gain ultra-wideband (UWB) dual-polarized Vivaldi antenna. The proposed antenna consists of two identical Vivaldi elements orthogonally crossed to achieve dual polarization. A tapered stepped-impedance feed matching line combined with a petal-shaped open-slot structure is deployed for every Vivaldi element to enhance impedance matching efficiently and extend operational bandwidth. Furthermore, gradient-tapered curved slots, periodic tapered rectangular slots, and bent extended stubs are arranged on both sides of the radiating patch, which effectively improves the antenna's gain and directivity at mid and low frequencies within its operating bandwidth. The overall dimensions of the proposed antenna are 0.57λ_L × 0.8λ_L, where λ_L refers to the free-space wavelength at the lowest operating frequency. Experimental measurements demonstrate that the proposed antenna achieves an impedance bandwidth of 1.5-9.5 GHz for S₁₁ ≤ -10 dB. The dual-polarization port isolation is higher than 21 dB throughout the operating band, with a peak gain of 11.38 dBi. The antenna can be deployed for wideband communication and radar detection applications.

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Dr. Chenxi Chen

Professor Jiade Yuan