An SIC-based Slotted Array Antenna Design for Millimeter-Wave Application

An novel slotted-array antenna based on SIC (Substrate Integrated Cavity) structure for millimeter-wave application is presented. 3 $\times$ 3 rectangular slots and an ellipse-ring slot amalgamate to form the slot array on the top surface of SIC structure. Basically the 3 $\times$ 3 slots are used to radiate out the energy of resonant modes inside the cavity of SIC structure. The ellipse-ring slot is employed to further widen the operating bandwidth and enlarge the gain performance. The simulated results show that the proposed antenna achieves an impedance bandwidth of 26.4% (27.29 to 35.6 GHz) with an average broadside gain of 9.2 dBi. The maximum broadside gain of 9.7 dBi at 32 GHz is obtained. In addition, both symmetric radiation patterns in the E- and H-planes are realized. The cross polarization level is lower than -30dB at the broadside radiation direction.