ADAS radar antenna for mmW/THz communication

Antenna for advanced driving assistance system (ADAS) is a progressive field of research that introduces the intelligent and autonomous attributes in modern vehicles to deliver increased safety and comfort. ADAS includes passive and active safety system that is designed to reduce the road fatalities by minimizing human error. Here, a microstrip-fed compact triband printed antenna is investigated for the system possessing 75.5–80.2 GHz, 93.6–100.5 GHz and 116.5–129.5 GHz frequency range and thus covers the standard 77/94/122 GHz bands. The antenna has an extremely compact size of (2 × 2 × 0.288 mm³) and is printed on the substrate RO4350B. By etching a series of closed and open-ended slots, triband characteristics are achieved by exciting the TM₀₁, TM₁₀ and TM₁₁ modes at the desired resonant frequencies. The proposed structure is first of its kinds and shows 85%, 89.2% and 76.4% of radiating efficiency with the gain of 6.43 dBi, 5.43 dBi and 8.07 dBi at 77.7 GHz, 97.4 GHz and 124.7 GHz respectively and can be potentially used for autonomous driving and ADAS System applications. Nevertheless, a multiple input multiple output design is proposed for the antenna to improve the data rate, link reliability and reduce multipath fading. Its parameters like isolation, diversity gain, envelope correlation and channel capacity loss validate its performance for MIMO applications also. In addition, lumped element RLC circuit of the proposed antenna is designed and evaluated.