The Q134 antenna capitalizes on Harris’ proven annular-slot technology providing a 3.7:1 operating bandwidth, which exceeds the useful bandwidth of most blades and other exposed apertures. Texas housing poker online, free. In addition to the broad operating bandwidth, the Q134 also provides a significant reduction in Radar-Cross-Section versus conventional blade designs. A novel design of a circularly polarized annular-ring slot antenna is discussed. The circular polarization is attained through a newly proposed double-bent microstripline that feeds the antenna at two different positions. Several structural parameters were experimentally studied with care to establish a design procedure, which was subsequently drawn into a design flow chart. Antennas List. Antenna Tutorial (Home) Slot antennas are used typically at frequencies between 300 MHz and 24 GHz. The slot antenna is popular because they can be cut out of whatever surface they are to be mounted on, and have radiation patterns that are roughly omnidirectional (similar to a linear wire antenna, as we'll see). This corresponds to a radiation efficiency of 90 percent for the cavity-backed annular-slot antenna. No attempt has been made here to estimate the over-all efficiency of the antenna. There is, of course, further absorption of energy radiated into the upper half-space. This loss is due to the finite conductivity of the adjacent ground plane.

A Broadband Eccentric Annular Slot Antenna Cable
A Broadband Eccentric Annular Slot Antenna Replacement
A Broadband Eccentric Annular Slot Antenna System

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.

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Author information

A Broadband Eccentric Annular Slot Antenna

Correspondence to Tayeb A. Denidni.

Additional information

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. Ladbrokes free slot games. 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.)

A Broadband Eccentric Annular Slot Antenna Cable

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A Broadband Eccentric Annular Slot Antenna Replacement

Denidni, T.A., Rao, Q. Patch Loading Circular Aperture Slot Antennas for Broadband WLAN Applications. Wireless Pers Commun33, 121–129 (2005) doi:10.1007/s11277-005-8261-9

A Broadband Eccentric Annular Slot Antenna System

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Keywords

Microstrip slot antennas
patch antenna
front–back radiation ratio