Sub-Terahertz Antipodal Vivaldi Antenna with CSRR Meta-Walled SIW Excitation

Vivaldi antennas have been widely used in radar, wireless communication, antenna arrays, and other fields due to their broadband, dual polarization, and high gain characteristics. This article proposes a novel type of vivaldi antenna, which uses a double-layered complementary split ring resonators (SRR) instead of a metallic vias as the electrical wall for the traditional SIW (Substrate Integrated Waveguide) excitation. The salient trait of the proposed meta-walled SIW feed is to avoid the the elaborate and complex metallic vias process in terahertz regime. Within a broadband frequency range over 26.7
^%
, it can achieve an averaged high gain (>11dBi). Besides, using quadratic sine corrugation on both sides of the antenna improves the efficiency and directionality of the antenna, and reduces return loss to −10 dB.