Design and Analysis of Enhanced U-Shaped Multiband Microstrip Patch Slotted Antenna Using DGS

Abstract

From the last few years, wireless communication is growing very rapidly in the communication industry. The main aim of this thesis report is to design a rectangular metallic patch with two different shapes of slots that are symmetrical maze-shaped slots and swastika-shaped slot for different wireless communication networks. By using Ushaped and double U-shaped defected ground structure the impedance bandwidths of the two proposed antenna designs is enhanced. The simulation results for the first proposed antenna display three resonant bands at frequencies of 2.47/4.48/5.2 GHz for Bluetooth/IMT/WLAN communication networks, with impedance bandwidths of about 100 MHz (2.4 2.5 GHz), 500 MHz (4.4 4.9 GHz), and 200 MHz (5.1 5.3 GHz), respectively and having return loss value of -19.93 dB, -43.4 dB,-23.3 dB respectively. The simulation results for the second proposed antenna display three resonant bands at frequencies of 1.9/2.5/5.6 GHz for GSM/Bluetooth/WLAN/WiMAX communication networks, with impedance bandwidths of about 200 MHz (1.8 2.0 GHz), 300 MHz (2.4 2.7 GHz), and 1000 MHz (5.4 6.4 GHz), respectively and having return loss value of - 18.04 dB, -17.39 dB,-27.13 dB respectively. For each simulated proposed antenna graphs of return loss, VSWR, smith chart, Radiation pattern and current distribution have been plotted and studied. Both the proposed designs are simulated using computer simulation technology (CST) software. The triple band metallic patch antenna having symmetrical maze-shaped slots and Ushaped DGS fed by microstrip line is fabricated using PCB design technique and their return loss results are tested by VNA E5071C. The measured and simulated return loss results are compared and it is concluded that return loss of compact rectangular patch with symmetrical slot and defected ground is better than the different shapes of rectangular patch.