Composite right/left-handed substrate integrated waveguide leaky-wave antenna array with low sidelobe level and high gain

Composite right/left-handed (CRLH) substrate integrated waveguide (SIW) leaky-wave antenna array with low sidelobe level and high gain is proposed. By controlling leakage amount of each interdigital slot etched on the broadside of the SIW, the sidelobe level of the antenna can be reduced effectively. A four-way SIW power divider with Chebyshev current distribution in magnitude is proposed to improve the main lobe and to suppress the sidelobe. The simulated results show that both the gain and radiation efficiency are improved by using antenna array. The proposed CRLH antenna array has a sidelobe level of -13.3dB and a high gain up to 23.67dB at 5.8GHz.