High-gain substrate integrated cavity antenna array with laminated waveguide feeding network for W-band application

In this paper, a W-band high-gain L-probe excited substrate integrated cavity (SIC) antenna and its arrays on low-temperature co-fired ceramic (LTCC) substrate are presented. To achieve high gain, the SIC antenna is excited by using the L-probe feed techniques. As for this antenna, the SIC is the main radiator, and the L-probe is also involved in radiation. Moreover, a compact two-layer low-loss laminated waveguide (LWG) feeding network is designed for a 4 × 4 antenna array. By combining the high-gain antenna element and low-loss feeding network, a high-gain antenna array is achieved. The proposed antenna array shows a wide measured impedance of 15.9% from 87 GHz to 102 GHz for |S11|<; -10 dB, and a gain up to 18.3 dBi by reconfiguring radiating elements, feeding network, and the transition. Furthermore, the measured aperture efficiency of the proposed array is 40 %.