Abstract

This paper presents a miniaturized Vivaldi antenna in order to meet the practical requirements of antenna array applications. Compared to the conventional Vivaldi antenna (CVA), the width of the modified Vivaldi antenna aperture is reduced 38.05% by adding regular slot edges (RSE), which will prevent the antenna array from generating the grating lobes. Additionally, the RSE has improved the radiative features of antenna. It mitigates the side lobe level, overcomes the beam-squint at E-plane, and increases gain. The parameters of the CVA and CVA-RSE are optimized. The simulated impedance bandwidth (VSWR<2) is approximately from 7.85 GHz to 12 GHz for both of them. A comparison between the modified CVA-RSE and CVA at 12 GHz shows an improved gain of 10.8 dB, −13.3 dB of the Side Lobe Level (SLL), and 0 degrees of the Main Lobe Squint (MLS) at E-plane, in contrast with 9.5 dB of gain, −9.9 dB of SLL, and 2 degrees of the MLS at E-plane in the conventional Vivaldi antenna.

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