Meandered Line Design Using Half-Mode Groove Gap Waveguide Technology for Travelling Wave Antennas

This communication presents a traveling wave antenna with frequency-dependent scanning capabilities specifically tailored for automotive radar applications at a fixed center frequency of 24 GHz. The antenna utilizes a meandered line design based on Half-Mode Groove Gap Waveguide technology, ensuring high efficiency and a low profile despite its metallic composition. With overall dimensions of 9λo x 5λo x λo (11.25 cm x 6.25 cm x 1.25 em), this compact and low-profile antenna exhibits fast scanning characteristics within a narrow bandwidth. Over a 5 % bandwidth, it achieves scanning angles of 45 degrees ( - 25 degrees to +20 degrees). Although experimental validation is pending, the simulated results show a directivity close to 22 dBi with 90 % radiation efficiency, indicating the need for further experimental verification.