Miniaturization of microstrip antennas using metamaterials

This research focuses on several main goals, including the design of a multiband rectangular microstrip patch antenna with spacious bandwidth and high return loss by using Complementary Split Ring Resonator (CSRR) beside the Rectangular Ruler Patches (RRPs), improvement the performance of Wi-MAX and GPS applications by using Circular Head Dumbbell Structure (CHDS) beside Circular Ring Patches (CRPs), study the behavior of CHDS on three types of conventional antennas as a redirector, miniaturization the size of the microstrip patch by using (CSRR), (CHDS), (RRPs), (CRPs) and Circular patch (CP). A patch antenna is designed and simulated for 4.66 and 5.61 GHz. Two substrates of FR-4 lossy are utilized with 4.3 dielectric constant, 1.4mm and 0.2mm thickness. The shape is used for conventional patch antenna as rectangular with a central feed source. The RISs have been used as secondary or additional patches with CSRR and as main patches with CHDS, which behaves as a redirector. The conventional antenna operates at a frequency band of 4.66 GHz and 5.61 GHz, while the designed antenna with CSRR and RRPs generates four wide band resonant modes at 4.36, 4.7, 5.6 and 5.9 GHz, therefore It is considered as a multi-use antenna. The designed antenna with CHDS and CRPs generates two band resonant modes at 1.55 GHz and 5.68 GHz.