| Abstract: | This paper proposes a new and simple design for a broadband planar antenna with bi- and uni-directional radiation for WLAN applications. The broadband operation is realized by loading a patch into a circular aperture slot, which is fed by a micostrip line on the other side of the slot. The frequency characteristics and the radiation performance of the antenna were studied theoretically and experimentally. The obtained results show that the proposed antenna can offer effective bandwidth for the two cases in bi- and uni-directional radiation. For the former, more than 75% impedance bandwidth can be obtained whereas for the latter, better than 20 dB front–back radiation ratio can be achieved.Tayeb A. Denidni (M 98-SM04) received the B.Sc. degree in electronic engineering from the University of Setif, Setif, Algeria, in 1986, and the M.Sc. and Ph.D. degrees in electrical engineering from Laval University, Qubec City, QC, Canada, in 1990 and 1994, respectively. From 1994 to 1996, he was an Assistant Professor with the engineering department, Universit du Qubec in Rimouski (UQAR), Rimouski, QC, Canada. From 1996 to 2000, he was also an Associate Professor at UQAR, where he founded the Telecommunications laboratory. Since August 2000, he has been with the Personal Communications Staff, Institut National de la Recherche Scientifique (INRS-EMT), Universit du Qubec, Montreal, QC, Canada. His current research interests include planar microstrip antennas, dielectric resonator antennas, adaptive antenna arrays, microwave and RF design for wireless applications, phased arrays, microwave filters, RF instrumentation and measurements, microwave and development for wireless communications systems. Dr. Denidni is a Member for the Order of Engineers of the Province of Qubec, Canada. He is also a Member of URSI (Commission C). He has authored more than 60 papers in refereed journals and conferences.Qinjiang Rao received the Ph.D. degree from Peking University, Beijing, China, in July 1999. Now he is a postdoctoral fellow at INRS-EMT, University of Quebec, Montreal, Canada. Before this term, he even worked as a postdoctoral fellow at Kyoto University, Kyoto, Japan, and University of Calgary, Calgary, Canada, respectively. His research fields focus on antennas, high-frequency electromagnetic simulators, radio wave propagation and scattering. In 1999, he was the recipient of a Post-doctoral Fellowship awarded by the JSPS (Japan Society for the Promotion of Science.) |
