Efficient and scalable media access control (MAC) protocol design is crucial to guarantee the reliable broadcast of safety messages in vehicular ad hoc networks (VANETs). To devise a MAC for safety message broadcasting with reliability and minimum delay, in this paper, we propose a novel time slotsharing MAC, referred to as SS-MAC, which can support diverse periodical broadcasting rates. In spe...

The Design of hexagonal patch is presented withsingle coaxial feed namelysimple hexagonalpatch,hexagonal patch with one triangular slot in ground for circular polarization. The circular polarization of two antennas are obtained with 1.31% axial ratio(AR) for simple hexagonal patch, 4.43% axial ratio hexagonal patch with slotted ground hexagonal patch antenna. The impedance band widths of these ...

UWB antenna with dual notched characteristics fed by microstrip transmission line is presented in this paper. The tapered connection between the rectangular patch and the feed line is used to produce a good impedance matching from 2.3 to 11.5 GHz. A dual band frequency notches are achieved using UDGS loaded with lumped capacitors. The first notch frequency band is achieved using DGS to reduce t...

Two design procedures for Radial Line Slot Antennas (RLSAs) with circular polarization and either maximum gain or an arbitrary shaped pattern are proposed. Firstly, a method to design a RLSA with any desired pattern is presented. It is based on an optimization algorithm and some measures to ensure its fast convergence and stability need to be taken. Secondly, a fast technique to calculate the l...

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A slot line fed planar dipole antenna with a parasitic strip for wide band applications is presented. The presented antenna offers a 2:1 VSWR bandwidth from 1.66 to 2.71 GHz covering the DCS/ PCS/UMTS and IEEE 802.11b/g bands with a gain better than 6.5 dBi. The uniplanar design, simple feeding, and high gain make it a versatile antenna for wireless applications. © 2009 Wiley Periodicals, Inc. ...

A V-shaped ultra-wideband antenna has been analyzed. Firstly, a rectangular planar monopole antenna has been studied and its base is tapered to obtain a better bandwidth. The feed-line is then offset for impedance matching. A bandwidth of around 14.3 GHz is obtained for this configuration. Then, a V-slot is cut in the patch and a parametric study of the width of the V-slot, the width of the pat...

This paper presents a new dual-band elliptical dielectric resonator antenna (EDRA). The EDRA is mounted on a ground plane and fed with a rectangular slot exited by a microstrip line. By optimizing the structure parameters, it is possible to obtain more than one excited mode in a limited frequency band. Numerical and measurement results for the radiation patterns of this slot fed EDRA are given ...