Abstract
In this paper, a compact, planar printed microstrip line fed pentagonal shape ultra-wideband antenna with triple band-notched characteristics is proposed and investigated. By incorporating a pair of mirrored Γ-shape, a pair of mirrored L-shape 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 mm3 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 dipole- like patterns in E-plane and omnidirectional in H-plane, minor group delay variation, and nearly constant gain at operating frequencies.
Highlights
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]
UWB antenna design is further modified by incorporating a pair of mirrored Γ- and Lshape slots along with bent C-shape parasitic resonator to obtain tunable triple notch responses in WiMAX, WLAN, and ITU-T frequency band respectively
The Γ-shape and L-shape slots increase the impedance at TM21 and TM31 modes respectively realising band rejection across WiMAX and ITU-T frequency band
Summary
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 addition of stubs, incorporation of slots in radiating patch or ground plane provides impedance mismatch, which consequences in notch response. First for microstrip line fed regular pentagonal microstrip antenna (PMSA), effects of variation in backed offset ground plane on patch modal frequencies are studied. A novel design of UWB antenna with pentagonal shape incorporated with a pair of mirrored Γ-shape and L-shape slots in the patch along with bent C-shape parasitic resonator on the backside of a patch for triple band notch responses is proposed. Later, using optimized pentagonal shape UWB antenna with mirrored Γ- and L-shape slots along with bent C-shape parasitic resonator, a notch response over three frequency bands at 3.35 - 3.81 GHz (WiMAX), 5.6 - 5.97 GHz (WLAN), and 7.94 - 8.48 GHz (ITU-T) is realized. The novelty of the paper is the inclusion of modal analysis about a mismatch of impedance to realize the notch responses along with compactness of the structure
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