Title: Bandwidth enhancement of microstrip antennas using additional gap-coupled hexagonal shape resonators to the radiating edges
Authors: Tapan Mandal; Santanu Das
Addresses: Department of Information Technology, Government College of Engineering and Textile Technology, Serampore, Hooghly 712201, India ' Department of Electronics and Tele-Communication Engineering, Bengal Engineering and Science University, Shibpur, Howrah 711103, India
Abstract: In this paper, the hexagonal shaped microstrip antennas (MSA) with defected ground plane and gap coupled multi-resonators are proposed and studied for different di-electric constant. The hexagonal shape structure occupies less area and is suitable for compact antenna design. The results showed gradual improvement in impedance bandwidth from 460 MHz to 2.21 GHz with frequency variation from 8 GHz to 7.96 GHz in case of substrate with di-electric constant 4.4. A sudden improvement of impedance bandwidth from 2.19 GHz to 3.75 GHz with frequency variation from 14.32 GHz to 10.5 GHz is observed by just lowering εr to 2.62.
Keywords: RHMSA; regular hexagonal microstrip antennas; planar multi-resonators; defected ground plane; parasitically coupled antenna; bandwidth enhancement; hexagonal resonators; dielectric constants; antenna design; impedance bandwidth.
International Journal of Signal and Imaging Systems Engineering, 2012 Vol.5 No.4, pp.284 - 289
Received: 05 Feb 2011
Accepted: 25 Mar 2011
Published online: 31 Dec 2014 *