High Gain Compact Multiband Cavity-Backed SIW and Metamaterial Unit Cells with CPW Feed Antenna for S,and Ku Band Applications

A compact multiband cavity-backed substrate integrated waveguide (SIW) and metamaterial antenna with coplanar waveguide (CPW) feed is designed for S and K_u bands thereby providing low and high frequency applications. Designing simultaneous achievement of high gain in S band and K_u band antennas are challenging task, but the proposed antenna overcomes this limitation. The proposed antenna has a ground structure with radiating T-shaped stub opposite to the feed line and a combination of SIW and metamaterial. SIW and complementary square split ring resonator (CSSRR) are used to enhance efficiency, directivity, gain and bandwidth. The proposed antenna structure uses FR-4 epoxy as the substrate material with ?_r?=?4.4 with a dimension of 40 × 40?×?1.6 mm and analyzed using ANSYS HFSS. The designed antenna resonates at three frequencies (i.e.), 4.23, 13.63 and 17.05 GHz with a gain greater than 5 dBi and efficiency greater than 80%. It is suitable for S band (ISM, WLAN, WiMax) and K_u band (radar, satellite communications) applications. The designed antenna is linearly polarized with high gain and efficiency at both the bands.