Paitoon Rakluea

Unidirectional CPW-fed slot antenna using metasurface

A unidirectional CPW-fed slot antenna with metasurface is proposed. Instead of using a conducting reflector, a metasurface as a superstrate is applied to modify the radiation pattern and enhance the antenna gain. The simulation and measurement results confirm that the antenna with metasurface can enhance on broadside gain of 6.5 dB and front-to-back ratio of 10 dB. The overall thickness of the proposed antenna is only 8.4 mm, which corresponds to λ0/15 at 2.45 GHz. Good agreement between measured and computed results is achieved.

Performance comparison of AODV and OLSR for MANET

In this paper present performance comparison of AODV and OLSR for mobile ad hoc network. Though mobile ad hoc network (MANET) routing protocols have been extensively studied through simulation. We perform extensive simulations using NS-2 simulator. In particular, We look at average throughput as performance parameters while varying various network parameters such as number of nodes and pause time under different area1000×1000 m2 and 1500×1500 m2. Our studies have shown that AODV better OLSR in terms of average throughput.

Planar UWB antenna with single band-notched characteristic

The planar UWB antenna with single band-notched characteristic is proposed. It is designed for Ultra-wideband wireless communications with a notch frequency response in the WLAN bands. The antenna consists of a rectangular slot etched out from the ground plane of a FR4 substrate (dielectric constant = 2.2) and a CPW-fed. The antenna is successfully designed, implemented and measured. The measured results show the proposed UWB antenna can achieve a return loss greater than 10dB from 3.02GHz to 11.05GHz with a single band-notched characteristic 4.85 GHz to 5.50 GHz.

Designing Rectangular Slot Loop Antenna for WLAN Application

This paper presents the design of rectangular microstrip slot loop antenna that competently achieves dual frequency operation by using a microstrip feed line. This antenna is designed at the resonance frequency 2.4 GHz and 5.2 GHz thereby covering the required frequency-bandwidth of 2.4- 2.4836 GHz and 5.15-5.35 GHz, which are widely used in Wireless LAN (WLAN). The characteristics of antennas are proposed and analyzed for instance input impedance, S11 parameter and far field radiation patterns. The antenna is analyzed by finite difference time domain (FDTD) method which can predict and analysis of the electromagnetic responses of complex problems.

Analysis of Right Angle Microstrip Slot Antenna

This paper presents analysis right angle microstrip slot antenna for achieve one frequency and dual frequency. The antennas consist of L-shaped slot and inverse L-shaped slot on the ground plane fed by microstrip line to obtain for one frequency. Dual frequency is operated by antenna which L-shaped slot is integrated with inverse L-shaped slot on one ground plane. The characteristics of antennas are proposed and analyzed for instance input impedance, S11 parameter VSWR and far field radiation patterns by using finite-difference time domain method (FDTD). A verification of our simulation procedure is confirmed by comparing IE3D software which is based on the method of moments (MOM).

Rectangular Slot Antenna with Asymmetrical Conductor Strip for Bandwidth Enhancement Coverage UWB Standard

This paper presents the bandwidth enhancement of rectangular slot antenna fed by microstrip line on the flexible Mylar Polyester film substrate. Asymmetrical conductor strip is designed and inserted in the rectangular slot to extend the bandwidth from 3.06 GHz to 7.2 GHz frequency range. Besides, the rectangular conductor at the end of the feeding microstrip line is introduced for increasing the bandwidth at high frequency up to 12.32 GHz. This improved antenna to cover standard frequency range of UWB (3.1 GHz -10.6 GHz). Finally, as to reject the frequency band of IEEE 802.11a (5.15 GHz – 5.35 GHz), the line strip at the side of tuning stub is added. In this case, the band-notched frequency from 5.15GHz to 5.38 GHz can be easily obtained.

Design of right angle slot antenna for dual band and dual polarized with wireless network

A novel compact and light weight antenna for dual band and dual polarized right angle slot antenna fed by micorstrip line use in wireless network technology is designed. The antenna composed of three right angle slot radiators on a same ground plane. Two right angle slots in the same size are arranged for circularly polarized at frequency 4.95 GHz and the other one is designed for linearly polarized at frequency 2.45 GHz. Therefore, in order to achieve dual band and dual polarized with good matching, the technique of arrangement is recommended. The simulation results of return loss, VSWR, gain, axial ratio, and radiation patterns are shown at resonant frequency 2.45 GHz and 4.95 GHz.

Printed circuit antenna for UWB systems

A printed-circuit antenna for UWB systems is presented. The antenna consists of a rectangular slot etched out from the ground plane of a RT/Duroid 5880 (dielectric constant = 2.2) and a CPW-fed bowtie stub for excitation. The antenna is successfully designed, implemented and measured. A compact antenna area of 31.8 times 34.2 mm2 is obtained. The proposed antenna in this study is capable of measured a very wide operating bandwidth approximately 2.93-11.97 GHz.

Development of circular ring antennas for mobile broadband systems

This paper presents a development of circular ring antennas for mobile broadband systems. The antennas is fed by a 50ohm with two-port micro-strip line elements. The dimension size of antennas is 38×80mm2 with low-cost FR4 substrate. The simulation and experimental result achieve the average gain about 3dBi covering the UWB frequency range 3.1GHz-10.6GHz. The antennas has correlation coefficient average less than 0.1. For far field radiation patterns is omnidirectional in XZ-plane and bi-directional in YZ-plane. The experimental results are in the same trend with the simulation ones. This antennas is suitable for Multiple Input Multiple Output (MIMO) fulfilling in UWB applications.

Study on CPW-antenna for wideband coverage mobile 4G/WLAN/WiMAX/UWB

A CPW antenna is designed at resonant frequency 2.3 GHz on low cost FR4 substrate by using simulation software. The simple rectangular slot loop antenna fed by coplanar waveguide is referred as a prototype antenna to show the designed technique for bandwidth enhancement. To enhance the first band, the rectangular slot is extended from the top of slot loop into the inner conductor, and to achieve more wideband by inserting triangular conductor at the bottom of rectangular slot. Finally, the technique to enhance wide bandwidth coverings mobile 4G, WLAN, WiMAX, and UWB is done by inserting U-shaped strip into inner rectangular slot. The simulated impedance bandwidth of our propose wideband antenna is 8.52 GHz from frequency range of 2.22 GHz-10.74 GHz which is the coverage of mobile 4G (2.3 GHz-2.5 GHz), WLAN standard of IEEE 802.11b/g/j/a/n (2.4 GHz-2.4835 GHz, 4.9 GHz-5.091 GHz, 5.15 GHz-5.35 GHz, and 5.725 GHz-5.825 GHz), WiMAX (2.5 GHz, 3.5 GHz, 5.8 GHz), and UWB (3.1 GHz-10.6 GHz). The measurements of this real antenna confirm that our proposed techniques can achieve wide frequency range of 2.26 GHz-11.14 GHz, which is suitable for the low-frequency of mobile 4G and also cover the high-frequency of UWB. That means, our antenna can supports all standard frequencies of applications in WLAN, WiMAX, and UWB. By this performance, the proposes antenna can be used in several wideband applications.