Small CPW-fed microstrip monopole antenna for WLAN applications

Abstract

IntroductionDuring the last decade, wireless communication systems attract a lot of attentions because of their advantages, including convenience, low cost and easy operation. WLAN (Wireless Local Area Networks) are being widely recognized as a flexible, cost effective and high speed data connectivity solution. There are three operation bands in the IEEE 802.11 WLAN standards , 2.4 GHz (2400 2484 MHz), 5.2 GHz (5150 5350 MHz) and 5.8 GHz (5725 5825 MHz) . A single antenna is highly desirable if it can operate at these three bands. In addition, the antenna used for WLAN should be in the planar form, lightweight, compact and easy to fed, so that it can easily be embedded in communication devices. Fractal structure can be used to design compact and multiband antenna because of its self-similarity and spacefilling properties [1]- [2]. Several modified Sierpinski gasket fractal antennas offering dualband operation have been reported [3]-[4]. Owing to their simple structure of a single metallic layer, good impedance matching, and easy to integration with active and passive circuit components, CPW-fed antennas become very attractive and suitable for WLAN [5]- [6]. In this Letter, we presented a small CPW-fed three-band monopole antenna that covers the 2.4GHz, 5.2GHz and 5.8GHz WLAN operation bands and has considerable bandwidths at every one. Antenna height reduction about 22% compared to standard Sierpinski gasket monopole. Antenna ConfigurationThe scheme of the proposed small CPW-fed modified Sierpinski gasket monopole antenna is shown in Fig.1. The monopole antenna is printed on one side of a substrate, Rogers RO4003C, which has 0.81mm thickness and permittivity of 3.38, and the plate of the other side of the substrate is eroded. During the process of simulation, it was found that the radiations of the monopole antenna are mainly from the round of the whole monopole and the round of top hollowed trapezium. The bottom triangle of the monopole has less influence on the operation of the monopole. Thus, in order to minimize the monopole, we can compress the height of the bottom triangle of the monopole. To satisfy the resonant condition that the perimeters of the whole monopole and the top hollowed trapezium are set to close to g at 2.5GHz and 5.4GHz, the standard equilateral triangle Sierpinski gasket monopole was changed to became a pentagon. In addition, in order to make the current on the monopole flow symmetrically, the cut triangle at the center of bottom of the monopole is set to a trapezium. The overall size of the antenna is l×h×t = 40mm×100mm×0.81mm. The feeding line is designed to match the 50ȍ SMA connector. The other detailed dimensions of the antenna are: h1 = 79.7mm, h2 = 14mm, h3 = 12.5mm, h4 = 7.2mm; l1 = 26mm, l2 = 16.4mm; w1 = 3mm, w2 = 3.3mm, w3 = 1.6mm. Simulated and Experimental Results978-1-4244-2642-3/08/$25.00 ©2008 IEEE Simulation results of the proposed monopole were performed using HFSS. A prototype antenna was fabricated and measured. The impedance bandwidth has been measured using an Agilent...

A Novel Compact Dual-Band Antenna Design for WLAN Applications

“…WLANs are also being widely recognized as a reliable, cost effective solution for wireless high speed data connectivity and a general purpose connectivity alternative for a broad range of applications. There are three operation bands in the IEEE 802.11 WLAN standards: 2.4 GHz (2400-2484 MHz), 5.2 GHz (5150-5350 MHz) and 5.8 GHz (5725-5825 MHz) [2]. WLANs working at IEEE 802.11a employ the higher frequency band from 5.15-5.35 GHz and 5.725-5.825 GHz while those working at IEEE 802.11b/g use the 2.4-2.484 GHz band.…”

Compact dual-band antenna for WLAN applications

“…WLANs are also being widely recognized as a reliable, cost effective solution for wireless high speed data connectivity and a general purpose connectivity alternative for a broad range of applications. There are three operation bands in the IEEE 802.11 WLAN standards: 2.4 GHz (2400-2484 MHz), 5.2 GHz (5150-5350 MHz) and 5.8 GHz (5725-5825 MHz) [1]. WLANs working at IEEE 802.11a employ the higher frequency band from 5.…”