Summary
International Symposium on Antennas and Propagation
2009
Session Number:3B1
Session:
Number:3B1-3
A Shorted-End Curved Strip Dipole on Dielectric and Conducting Plane for Wireless LANs
N. Fhafhiem, P. Krachodnok, M. Uthansakul, R. Wongsan,
pp.835-838
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
Wireless local area network (WLAN) system has been extensively used for communications in wide range of the service area. The antenna is important for develop WLANs, it applied for high frequency 2.45 GHz. In addition the antenna has been sufficient gain, it required either unidirectional or omnidirectional beam coverage abroad area and high power handing. Moreover, the antennas are relatively simple in concept, structure easy, and inexpensive. The dipole antenna has some qualification that prominent point, its shape could be change easy and variety. This antenna will be usually placed at the wall of rooms or buildings. However, most kinds of this antennas has omnidirectional pattern, therefore, they are not suitable for field radiating in the large room because of power loss in unnecessary directions such as outside of room. Also, this paper is interested that qualification. This argues, if we can design an antenna to illuminate a predefined wide coverage area, it will have more efficient for field radiating. The related literatures to the shape or curved dipole structure have been reported by several authors. Krishnan et al. [1] presented a V-shape wire loop that structure liked butterfly, it had elliptically radiation pattern. Dubost [2] presented the antenna which is shorted-circuited dipole parallel on perfect reflector plane. Tumvichit et al. [3] presented a half-wave dipole with a conductor plane at a distance much smaller than a quarter wavelength, the operating frequency is 2 GHz. Feed point of the antenna is fed though the coaxial cable on the backside of the conductor plane, it had the half power beamwidth is 85.5° in the E-plane and 87° in the H-plane. Besides these, Pimpol and Wongsan [4] presented the impedance analysis of a shorted-end curved dipole on reflector plane. A curved dipole consists of curved wire dipole and shorted their both end on metallic reflector plane applied for the broadcasting station (UHF TV). As far as we know, there is no information about curved strip dipole which is necessary for the structure that requires the simple in concept, simple feeder high power handing, small structure, and used for high frequency that is required. Since impedance is the important characteristic that determines efficiency of antenna. Therefore, this paper focuses on the impedance and parameter that used for design of a shorted-ends curve strip dipole. Numerical result of this antenna will be simulated by Computer Simulation Technology (CST) Software. At first, we present about configuration geometry of propose curved strip antenna (Sect. 2). Next, current distributions, input impedance, return loss, and radiation patterns are introduced with computational results in Sect. 3. Finally, the conclusions are given in Sect. 4.