Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FA3
Session:
Number:4FA3-2
A Study of a Leaf-Shaped Bowtie Antenna Backed by an Electromagnetic Band Gap Structure
Tomoyuki KOYANAGI, Manabu Yamamoto, Toshio Nojima,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Ultra-wideband (UWB) radio technology has recently attracted considerable attention for various applications, such as short-range high-speed communication, sensor networks, radar and location tracking. As a planar-type wideband antenna being useful for UWB radio systems, the authors have previously proposed a leaf-shaped bowtie antenna [1]. It have been also demonstrated that unidirectional radiation characteristics can be obtained over a wide frequency range by placing the antenna parallel to a reflector [2]. For the case when a perfect electric conductor (PEC) plane is used as the reflector, the antenna height from the reflector is chosen to be one-quarter wavelength of the operating center frequency in order to avoid the degradation of the antenna characteristics [2],[3]. In recent years, it is reported by many researchers that unidirectional beam can be realized by arranging omnidirectional antennas on electromagnetic band gap (EBG) structures with the antenna height of less than one-quarter wavelength [4]-[6]. This paper presents a study on a low profile unidirectional UWB antenna consisting of a leaf-shaped bowtie antenna and a mushroom-type electromagnetic band gap (EBG) reflector [6]. In order to demonstrate effective performance of the proposed configuration, fundamental characteristics of the antenna are investigated and revealed by the finite-difference time domain (FDTD) analysis and measurements.