This paper investigates the channel allocation problem in multi-channel wireless networks with directional antennas. In particular, we propose a general analytical framework on the number of channels, in which we consider a new directional antenna model. This antenna model is more general than existing antenna models since other existing antenna models can be regarded as a special case of our m...

Smart and directional antennas can be used to improve the throughput performance of wireless communications in ad hoc networks. This improvement consists basically of minimizing collision and increasing simultaneous communications. Directional antennas reduce potential collision zone since data packets are directionally transmitted. Smart antennas are more intelligent than directional antennas ...

Wireless adhoc netwok is a decentralized type of wireless network, it does not rely on a preexisting infrastructure. These types of networks are used in situations where temporary network connectivity is needed. This research paper explores the effect of using directional antennas in ad hoc network. Antenna patterns of omni directional and directional antenna have been developed using the OPNET...

This paper presents the development of an Ultra Wide Band (UWB) monopole antenna with dual band notch characteristics. Modified crown-square shaped fractal slots in the ground-plane are implemented to enhance the impedance bandwidth to around 58% as compared to conventional square monopole antenna without slots. Impedance bandwidth of the proposed antenna is approximately 114% with Voltage stan...

This research proposes a development of embroidered dual band textile antenna that could integrate wearable telecommunication device with a garment. The proposed antenna could operate at 2.4 GHz and 5.8 GHz of WLAN applications. Two versions of the presented antennas are developed from the conventional rectangular patch. Two types of slot structures are loaded on each antenna and the antenna pe...

CPW structure is became common structure for UWB and multi band antenna design and SRR structure is well-known kind of metamaterial that has been used in antenna and filter design for multi band application. In this paper, a SRR dual band monopole antenna with CPW-fed for WLAN and WiMAX is presented. The prototype antenna is designed for wireless communication such as WLAN and WIMAX respectivel...

This paper describes an antenna design approach for achieving super directivity in AESA (Active Electronic Scanned Array) radar using unconventional 3D phased array (PA) concept based on directional Yagi–Uda elements. The proposed scheme is shown to have a wider scanning feature, with higher comparison the same geometry dipole without increasing element number. antenna’s microwave includes anti...

In this paper, we investigate the network connectivity of wireless sensor networks with directional antennas. In particular, we establish a general framework to analyze the network connectivity while considering various antenna models and the channel randomness. Since existing directional antenna models have their pros and cons in the accuracy of reflecting realistic antennas and the computatio...