Compact Triple Band Notched Pentagonal Shaped UWB Antenna Loaded with Slots and Parasitic Resonator

Abstract

In this paper, a compact, planar printed microstrip line fed pentagonal shape ultra-wideband antenna with triple bandnotched characteristics is proposed and investigated. By incorporating a pair of mirrored Γ-shape, a pair of mirrored Lshape slots in the pentagonal patch and bent C-shape parasitic strip at the backside of a patch, the tunable band notched responses are realized. The proposed antenna is fabricated on Rogers RO3003 substrate with permittivity 3.0 and thickness of 0.76 mm. The measured results indicate that the proposed antenna having dimensions of 32 × 24 × 0.76 mm 3 has a bandwidth over the frequency band 2.7-10.6 GHz with S11 ≤ -10 dB (VSWR ≤ 2), except in WiMAX band (3.27-3.85 GHz), WLAN band (5.6-5.95 GHz) and ITU-T band (7.84-8.46 GHz). The presented antennas show dipolelike patterns in E-plane and omnidirectional in H-plane, minor group delay variation, and nearly constant gain at operating frequencies. Index Terms-L-shape slot, Parasitic resonator, Triple band-notch characteristics, Ultra-wideband pentagonal patch I. INTRODUCTION Ultra-wideband (UWB) wireless communication technology has been receiving wide impetus since the Federal Communication Commission unlicensed the frequency band of 3.1-10.6 GHz for communication purposes [1]. The frequently used forms of radiating patch in UWB planar antennas are square, circular [2]; crescent-shape [3]; sectoral [4]; elliptical [5]; and their amended variations as they can be easily incorporated with microwave integrated circuits, lightweight and low profile in nature. In the designated UWB spectrum other services such as WiMAX, WLAN, IEEE 802.16 (3.3-3.7 GHz), IEEE 802.11a, ITU-T (8.02-8.4 GHz band) exist. Hence, it is necessary to develop a UWB antenna with notched frequency responses to reduce the probable interferences between mentioned narrowband and UWB systems. Numerous designs of antenna have been reported for notched frequency responses in ultrawideband. The reported designs include incorporating an elliptical slot within circular monopole [6];two annular ring-shape slots with half-wavelength dimensions at a notched frequency in the radiating patch [7]; attaching open-circuited stubs at the ends of plus-shape patch [8]; attaching quarter wavelength stubs to quasi U-shape patch [9]. By incorporating a split ring resonator (SRR) in the feedline, band rejection of WLAN has been achieved [10]. A slotline resonator within the feedline of