A compact printed wide-slot (PWS) antenna is proposed for UWB applications. The proposed UWB-PWS antenna basically consists of a stepped microstrip feed-line with a rectangular patch stub and a rectangular wide-slot element at the aperture. Additional parasitic split-ring elements are placed along the patch stub to achieve notch-band characteristics. As the proposed antenna in absence of the ri...

In this paper, two miniaturized (20 × 20mm2) coplanar waveguide fed slot antennas are proposed. Both the antennas are characterized by ultra wide impedance bandwidth while one of them has an additional narrow band near 2.5GHz. The radiating element of the proposed antennas is a modified rectangular geometry which is excited by a 50 ohm line. The slot in the ground plane is stair case shape for ...

In this paper, periodic structures are investigated in antenna design for wireless applications. These antennas were compared with CRLH miniaturization method. Three different models of patch antenna with coaxial feed on EBG ground, metamaterial substrate or EBG/AMC structure have been presented here. Also two compact dual-band antennas have been designed and fabricated based on CRLH techniques...

Microstrip patch antennas are widely used in modern day communication devices due to their light weight, low cost and ease of fabrication. In this paper, we have designed a Microstrip Patch Antenna and array of patch for 2.45GHz for Wireless Local Area Network (WLAN) applications using antenna simulation software. The designed antenna consists of rectangular radiating patch on FR-4 (lossy) subs...

The proliferation of wireless transceivers and the availability of unlicensed band has given a boost to the deployment of wireless networks, with IEEE802.11/WiFi being the major driver in this arena. In this research, we consider a wireless mesh network designed for long distance communication with a typical deployment scenario of a maritime mesh network. This network uses an antenna system mad...

ACR: An Adaptive Communication-Aware Routing through Maximally Zone-Disjoint Shortest Paths in Ad Hoc Wireless Networks with Directional Antenna Tetsuro Ueda, Shinsuke Tanaka, Bokuji Komiyama ATR Adaptive Communication Research Laboratories 2-2-2 Hikaridai, Seika-cho Soraku-gun, Kyoto 619-0288 JAPAN e-mail: {teueda, shinsuke, komiyama}@atr.jp Tel: +81-774-95-1529 Fax: +81-774-95-1509 Siuli Roy,...

In wireless networks, hidden terminal problem is common and leads to collision which makes it difficult to provide the required quality of multimedia services or support priority based services. To overcome these problems a directional antennas have been extensively used in designing MAC protocols for wireless network. Directional antennas provide many advantages over the classical antennas. In...

A compact-size planar antenna with ultra-wideband (UWB) bandwidth and directional patterns is presented. The antenna can be fabricated on a printed circuit board (PCB). On one side of the PCB, it has a circular patch, and on the other side it has a slot-embedded ground plane with a fork-shaped feeding stub in the slot. Directional radiation is achieved by using a reflector below the antenna. To...

A novel tri-band patch antenna with enhanced bandwidth and a diverse radiation pattern is presented in this study. An off-center probe introduced to excite conventional circular antenna, the multi-frequency resonance modes of TM01, TM02, TM03 different properties are obtained. Four metal cambered strips distributed around adjust impedance matching antenna. In order widen bandwidth, parasitic pl...

Directional antenna offers a variety of benefits forwireless networks, one of which is the increased spatial reuse ratio. This feature gives rise to the improved throughput in resource limited wireless ad hoc networks. In this paper, we formulate the maximum flow problem as an optimization problem in wireless ad hoc networks with switched beam directional antennas constrained by interference. W...