Zakir Ali

Dual Wideband Stacked Patch Antenna for WiMax and WLAN Applications

This paper presents dual wideband microstrip antenna which is designed using stacking configuration to give a better bandwidth as compared to single layer substrate design. The designed slotted stacked patch antenna can operate in the Wimax, (2.2-3.4 GHz) WLAN (2.40--2.48GHz), and UMTS II (2.50--2.69GHz) frequency band giving a maximum bandwidth of 37.95%. The air is used as a dielectric between the two stacks and a height of 10 mm is kept between the two stacks. The feeding technique used in the design is the coaxial probe feed and the impedance matching and radiation characteristics of the structure are investigated using MOM based IE3D. The simulation result shows that the proposed antenna can offer excellent performance for Wi Max and WLAN application.

Dual band triangular slotted stacked microstrip antenna for wireless applications

In this paper stacked configuration of microstrip antenna is used to produce dual wide band which is suitable for various wireless applications. Using triangular slot and stacking of foam substrate of dielectric constant 1, two bands of bandwidth 18.70% and 12.10% is obtained. The antenna is fed by coaxial probe feeding technique. The proposed patch antenna is designed on the foam substrate and simulated on the Zeland IE3D software.

Dual Band Microstrip Antenna for UMTS/WLAN/WIMAX Applications

In this paper a novel compact slit loaded line fed micro strip antenna is presented for UMTS/WLAN/WIMAX lower band applications. The proposed antenna has been fabricated on glass epoxy substrate having dielectric constant 4.2. The experimental results show that the antenna can provide two separate impedance bandwidths of 247MHz (about 15.10% centered at 1.64GHz) and 634MHz (about 26.63% centered at 2.38GHz), which is best suited frequency range of UMTS(1.92-2.17GHz), WLAN(2.40-2.48GHz) and WIMAX(2.495-2.695GHz). Good impedance matching and radiation efficiency in the desired frequency bands has been achieved.

Performance analysis of first iteration koch curve fractal log periodic antenna of varying flare angles

Miniaturization has always been a crucial challenge in the field of antenna engineering. In the recent past a number of researchers have shown that fractal geometry have potential to design smaller, broad band and multi band antennas. In this proposed work performances of log periodic fractal antennas of different flare angles have been investigated. Simulation results show that fractal log periodic antenna gives better performance in terms of gain, return loss and directivity. Performance of log periodic fractal antenna has also been investigated for flare angles 30°, 45°, 60°, 70° and 80°. In this proposed work fractal antenna gives best performance with 60° flare angle.

Wide Band Inset Feed Microstrip Patch Antenna for Mobile Communication

The main aim of proposed work is to obtain a large bandwidth with reduced size. The proposed micro strip antenna has a wide bandwidth covering the range from 1.806-2.978 GHz. By using new inset feed technique, wide bandwidth of 68.69% has been achieved which is suitable for Personal communication system (PCS 1.85-1.88 GHz) and IEEE 802.11b/g (2.4-2.485 GHz). The proposed patch antenna is designed and simulated on the Zealand IE3D software and the hardware of the proposed micro strip antenna is tested on the network analyzer.

Bandwidth optimization of compact microstrip antenna for PCS/DCS/bluetooth application

A novel compact broadband microstrip patch antenna is presented for various wireless applications. The proposed antenna has been fabricated and the impedance bandwidth and radiation pattern are measured. The simulated and measured antenna characteristics along with radiation pattern and gain are presented. It is stated that the proposed designed antenna can completely cover the required band widths of Digital communication system (DCS 1.71–1.88 GHz), Personal communication system (PCS 1.85–1.88 GHz) and IEEE 802.11b/g (2.4–2.485 GHz) with satisfactory radiation characteristics. The Experimental result shows that the proposed antenna presents a bandwidth 60.25% covering the range of 1.431–2.665 GHz with the maximum radiation efficiency 90%.

Performance analysis of compact Koch fractal antennas at varying iterations

Miniaturization has always been a critical challenge in the field of antenna design. Antenna design using fractal geometry has given a better solution for this issue. In this direction many works have been performed for designing a miniaturized antenna using Koch curve fractal geometry. In this proposed work log periodic fractal antenna has been designed with first iteration and second iterations. Performances of these antennas has been evaluated and compared with normal log periodic antenna. Simulation results show that the second iteration log periodic fractal antenna gives best performance amongst all.

Bandwidth Enhancement of W Slot Microstrip Antenna Using Stacked Configuration

In this paper, bandwidth of microstrip antenna is increased by introducing a slot of W shape and using stacked configuration. The proposed W slot MSA is suitable for high speed WLANs applications. By using different approach of bandwidth enhancement such as stacked configuration, cutting slot and changing the position of the coaxial probe bandwidth equal to 25.78% is achieved. The antenna is fed by coaxial probe feeding technique. The designed antenna operates in the frequency range of 4.381GHz to 5.668GHz covering the WLAN frequency band of 5.15 GHz - 5.35 GHz. The antenna is designed using air as a dielectric substrate between the two layers and simulated on the Zeland IE3D software.

A Wideband Compact Microstrip Antenna for DCS/PCS/WLAN Applications

A novel compact slit-loaded broadband microstrip patch antenna is presented for various wireless applications. The proposed antenna has been fabricated and the impedance bandwidth and radiation pattern are measured. The compact antenna size is 40 × 60 × 1.6 mm which can be integrated conveniently with other RF circuits. The simulated and measured antenna characteristics along with radiation pattern and gain are presented in the paper. It is stated that the proposed designed antenna can completely cover the required bandwidths of digital communication system (DCS 1.71–1.88 GHz), personal communication system (PCS 1.85–1.88 GHz) and IEEE 802.11 b/g (2.4–2.485 GHz) with satisfactory radiation characteristics. The experimental result shows that the proposed antenna presents a bandwidth 60.25 % covering the range of 1.431–2.665 GHz with the maximum radiation efficiency 90 %.

Inset Fed Circular Microstrip Antenna with Defected Ground

In this paper, a novel design of defected ground circular patch antenna using glass epoxy materials has been presented. The substrate of the intended antenna was prepared of glass epoxy, whereas patch and ground plane are made out of copper. Enhancement in the geometry is done by increasing the electrical length and volume without growing the size of the patch antenna. The simulations were accomplished using Computer Simulation Technology software and the association of measured and simulated results of anticipated antenna has been studied. Experimental and simulated outcome are in outstanding conformity.