Zeeshan Ahmed | National University of Sciences & Technology (NUST) (original) (raw)
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Papers by Zeeshan Ahmed
2018 International Conference on Frontiers of Information Technology (FIT), 2018
In this paper, a Co-Planar Waveguide (CPW)-fed circular monopole antenna for Ultra Wide Band (UWB... more In this paper, a Co-Planar Waveguide (CPW)-fed circular monopole antenna for Ultra Wide Band (UWB) applications is presented. The proposed antenna is etched on FR-4, which is cost effective substrate having relative permittivity of 4.4 and 1.6mm thickness. The size of the antenna is 60mm×60mm×1.6mm. Fractal slots are placed in circular patch for making frequency notch bands. The final antenna covers 1.75GHz to 11.0GHz with three rejection bands at 2.18GHz, 3.165GHz and 4.58GHz. Current distribution for four different frequencies at 2.2GHz, 3.2GHz, 4.55GHz and 7GHz is described. In addition, the antenna efficiency for the entire resonating frequency band is presented. The results depict that the antenna's maximum gain is between-9dBi and 6.2dBi. The comparison of experimental and simulation results are also discussed.
—The presented paper exhibits a coplanar waveguide (CPW)-fed symmetrical staircase shaped, planar... more —The presented paper exhibits a coplanar waveguide (CPW)-fed symmetrical staircase shaped, planar monopole Ultra Wideband (UWB) antenna having dimensions 40x30x1.6mm 3 with 5GHz WLAN notch band characteristic. The staircase pattern in the radiating patch and the U-shaped slot resonator in the feed line are used to achieve the UWB and notch the 5GHz WLAN band, respectively. The proposed antenna has impedance bandwidth ranging from 2.84GHz-13.9GHz to cover UWB. Interference caused by WLAN band from 5.15GHz-5.35GHz and 5.725GHz-5.825GHz is notched effectively. The proposed antenna has been printed on FR4 substrate with dielectric constant of 4.4 and thickness of 1.6mm. Moreover, the fabricated prototype antenna shows a good agreement between the simulated and measured results. Keywords— CPW, monopole, staircase rectangular patch, notched band, ultra wide band (UWB)
— The presented article exhibits a novel compact sized monopole Ultra-WideBand antenna with dual ... more — The presented article exhibits a novel compact sized monopole Ultra-WideBand antenna with dual band-notch characteristic having size of 19x11x1.6mm 3. The antenna is fed using microstrip line on the backside of the substrate and shorted through a 0.5mm radius pin to the patch on top of the substrate. The U-shaped (crescent) slot embedded in the patch and the U-shaped slot in the microstrip feed line are used to reject the WIMAX band (3.3GHz-3.8GHz) and X-band Downlink range (7.25GHz-7.85GHz), respectively. The proposed antenna has been printed on low cost FR4 substrate with relative permittivity of 4.4 and thickness of 1.6mm. Moreover, the fabricated prototype antenna shows good agreement between the simulated and measured results.
— The presented paper exhibits the design configuration of Microstrip Line (MS)-fed and Co-Planar... more — The presented paper exhibits the design configuration of Microstrip Line (MS)-fed and Co-Planar Waveguide (CPW)-fed symmetrical staircase shaped, planar monopole Ultra Wideband (UWB) antennae with WLAN band rejection characteristic having sized 30x30x1.6mm 3. The staircase pattern in the radiating patch and the feed line's U-shaped slot are used to achieve the UWB and notch the 5GHz WLAN band, respectively. For the MS-fed antenna with partial ground plane, a slot is introduced in the ground which is used for impedance matching and it enhances the effect of WLAN band-notch as well. The proposed antennae have achieved the 3.1GHz-10.6GHz UWB frequency range. In between this UWB range, the 5GHz WLAN band (5.15GHz-5.35GHz and 5.725GHz-5.825GHz) is notched effectively to avoid interference with UWB. FR4 substrate, having relative permittivity of 4.4 and thickness of 1.6mm, is used to print these antennae. Moreover, the fabricated prototype antennae show good simulation and measurement results.
2018 International Conference on Frontiers of Information Technology (FIT), 2018
In this paper, a Co-Planar Waveguide (CPW)-fed circular monopole antenna for Ultra Wide Band (UWB... more In this paper, a Co-Planar Waveguide (CPW)-fed circular monopole antenna for Ultra Wide Band (UWB) applications is presented. The proposed antenna is etched on FR-4, which is cost effective substrate having relative permittivity of 4.4 and 1.6mm thickness. The size of the antenna is 60mm×60mm×1.6mm. Fractal slots are placed in circular patch for making frequency notch bands. The final antenna covers 1.75GHz to 11.0GHz with three rejection bands at 2.18GHz, 3.165GHz and 4.58GHz. Current distribution for four different frequencies at 2.2GHz, 3.2GHz, 4.55GHz and 7GHz is described. In addition, the antenna efficiency for the entire resonating frequency band is presented. The results depict that the antenna's maximum gain is between-9dBi and 6.2dBi. The comparison of experimental and simulation results are also discussed.
—The presented paper exhibits a coplanar waveguide (CPW)-fed symmetrical staircase shaped, planar... more —The presented paper exhibits a coplanar waveguide (CPW)-fed symmetrical staircase shaped, planar monopole Ultra Wideband (UWB) antenna having dimensions 40x30x1.6mm 3 with 5GHz WLAN notch band characteristic. The staircase pattern in the radiating patch and the U-shaped slot resonator in the feed line are used to achieve the UWB and notch the 5GHz WLAN band, respectively. The proposed antenna has impedance bandwidth ranging from 2.84GHz-13.9GHz to cover UWB. Interference caused by WLAN band from 5.15GHz-5.35GHz and 5.725GHz-5.825GHz is notched effectively. The proposed antenna has been printed on FR4 substrate with dielectric constant of 4.4 and thickness of 1.6mm. Moreover, the fabricated prototype antenna shows a good agreement between the simulated and measured results. Keywords— CPW, monopole, staircase rectangular patch, notched band, ultra wide band (UWB)
— The presented article exhibits a novel compact sized monopole Ultra-WideBand antenna with dual ... more — The presented article exhibits a novel compact sized monopole Ultra-WideBand antenna with dual band-notch characteristic having size of 19x11x1.6mm 3. The antenna is fed using microstrip line on the backside of the substrate and shorted through a 0.5mm radius pin to the patch on top of the substrate. The U-shaped (crescent) slot embedded in the patch and the U-shaped slot in the microstrip feed line are used to reject the WIMAX band (3.3GHz-3.8GHz) and X-band Downlink range (7.25GHz-7.85GHz), respectively. The proposed antenna has been printed on low cost FR4 substrate with relative permittivity of 4.4 and thickness of 1.6mm. Moreover, the fabricated prototype antenna shows good agreement between the simulated and measured results.
— The presented paper exhibits the design configuration of Microstrip Line (MS)-fed and Co-Planar... more — The presented paper exhibits the design configuration of Microstrip Line (MS)-fed and Co-Planar Waveguide (CPW)-fed symmetrical staircase shaped, planar monopole Ultra Wideband (UWB) antennae with WLAN band rejection characteristic having sized 30x30x1.6mm 3. The staircase pattern in the radiating patch and the feed line's U-shaped slot are used to achieve the UWB and notch the 5GHz WLAN band, respectively. For the MS-fed antenna with partial ground plane, a slot is introduced in the ground which is used for impedance matching and it enhances the effect of WLAN band-notch as well. The proposed antennae have achieved the 3.1GHz-10.6GHz UWB frequency range. In between this UWB range, the 5GHz WLAN band (5.15GHz-5.35GHz and 5.725GHz-5.825GHz) is notched effectively to avoid interference with UWB. FR4 substrate, having relative permittivity of 4.4 and thickness of 1.6mm, is used to print these antennae. Moreover, the fabricated prototype antennae show good simulation and measurement results.