Jintana Nakasuwan

Design CPW Fed Slot Antenna for Wideband Applications

In this paper, a CPW-fed slot antenna for wideband application was designed and simulated. In order to examine the performances of this antenna, a prototype was designed at frequency 2.4GHz and simulated with various width of slot antenna in both sides for input impedances matching and simulated by IE3D software package of Zeland. The simulation result of bandwidth is 1.65GHz (2.1{3.75 GHz) which covers the standard frequency of IEEE 802.11 b/g (2.4{2.4835GHz) and Wimax (2.3{3.6GHz). With these performances, the proposed antenna can be used in wideband applications. DOI: 10.2529/PIERS061009084055

Investigate Rectangular Slot Antenna with L-shaped Strip

Rectangular Slot antenna fed by microstrip line is designed for standard of IEEE 802.11b/g (2.4{2.4835GHz), IEEE 802.11a (5.15{5.35GHz), and IEEE 802.16d (5.7{5.9GHz). A rectangular slot antenna which comprises of two conductor strips located in a slot cut in the ground plane was investigated for dual frequency. This antenna was analyzed by using IE3D commercial software from Zeland (1). In this case, the frequency range at return loss i10dB is 2.26{2.61GHz for low frequency and is 5.05{8.18GHz for high frequency. DOI: 10.2529/PIERS061007105855

e-Shaped Slot Antenna for WLAN Applications

This paper present an e-shaped slot antenna for wireless communications. The antenna is designed for dual frequency band 2.4{2.52GHz and 4.82{6.32GHz, which support WLAN communications coverage IEEE 802.11b/g (2.4{2.4835GHz), IEEE 802.11j (4.90{5.091), IEEE 802.11a (5.15{5.35GHz), and IEEE 802.16d (5.7{5.9GHz). The bandwidth at low reso- nant frequency and high resonant frequency are about 0.12GHz and 1.5GHz, respectively. The simulation results of e-shaped slot antenna are analyzed by using Method of Moment (MoM) from IE3D Software. DOI: 10.2529/PIERS061007105447

Design Narrow Slot Antenna for Dual Frequency

Abstract| The narrow slot loop antenna and linear slot antenna fed by microstrip line are designed for dual frequency at 2.44 GHz and 5.25 GHz on the standard of IEEE 802.11b/g (2.4{2.4835 GHz), IEEE 802.11j/a (5.15{5.35 GHz), and IEEE 802.16d (5.7{5.9 GHz).

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.

Inset dual U-strip slot antenna fed by microstrip line for WLAN applications

This paper presents the slot antenna fed by microstrip line with inset U-strip for dual frequency operates in WLAN applications. The rectangular slot antenna is proposed for comparison between with and without U-strip in slot antenna by using three configurations of slot antenna. This antenna is designed for dual frequency used in WLAN system coverage IEEE 802.11 b/g (2.4-2.4835 GHz), IEEE 802.11j (4.90-5.091), IEEE 802.11a (5.15-5.35 GHz) and WiMAX of IEEE802.16d (5.7-5.9 GHz). The PCB-FR4 substrate with dielectric constant (epsivr) 4.5 of thickness 1.6 mm is chose for low cost. The simulation results of these slot antennas are analyzed by using Method of Moment (MoM) from IE3D Software. Finally, the result of bandwidth at low frequency and high frequency of the desirable antenna are 9.76% and 31.6% at frequency range 2.3-2.58 GHz and 4.76-6.34 GHz, respectively.

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.

Frequency Discriminator Using Double Capacitive Layer Distributed RC Network

The paper describes a frequency discriminator using double capacitive layers uniformly distributed RC network (DURC). The configuration of the circuit consisted of two active DURC notch networks. Herein, the capacitive ratio of the DURC network are used to adjust it steepness of the magnitude slope of a frequency discriminator. It is shown that the output voltage of the circuit has more steepness of slope than does a simple capacitive layer URC. Simulated results of the proposed circuit is investigated.

Multi-Frequency Rectangular Spiral Slot Antenna for WLAN and X-Band Applications

A new design of multi-frequency antenna was presented. Rectangular spiral slot antenna was designed on the RT/Duroid 5880 substrate with 2.2 of dielectric constant and 1.575 mm of thickness. The antenna was proposed with information of designing and matching improvement. The characteristics of the proposed antenna were determined by FDTD method. Some matching techniques were used, in order to obtain the multi-frequency rectangular spiral slot antenna supporting IEEE 802.11b/g (Wi-Fi) and X-band communications