SIW Cavity-Backed Slot Antennas with Improved Gain

In this paper, three cavity-backed slot antennas utilizing the substrate-integrated waveguide (SIW) technology are proposed. They are single-slot, two-slot, and 2×2-slot antennastructures. Their performance is numerically evaluated by means of the method of finite elements. Using two slots backed by acircular SIW cavity, one can improve antenna gain by 2.3 dB over the gain of the single-slot antenna at the cost of a slight increase of the antenna dimensions. The maximum gain of the circular cavity backed two-slot antenna is 7.7 dB at 9.59 GHz with a broadside radiation pattern and with the desired inputmatching. For a 2×2-slot antenna, a gain of 10 dB at 9.58 GHz is achieved. This is 4.6 dB and 2.3 dB higher than the gain of thesingle and two-slot antennas, respectively. We show that its radiation pattern has low side lobe and back radiation. All theproposed antenna structures are made of a single-layer substrateand are fed by a 50Ω microstrip line. These antenna structures are compact and low-cost and have high radiation efficiency

کلیدواژه ها:

cavity-backed antenna ، SIW antenna ، compact antenna array