In the real military scenarios and particularly using Unmanned Aerial Vehicles (UAVs) that perform aspecific communication task; it is not desirable to have an antenna that covers a wide angle. Omni directional antenna transmits power into all directions and thus it gives transmitter benefits of increasing the probability of being detected by hostile receivers. This paper addresses the problem ...

Recent studies on directional media access protocols (MACs) using smart antennas for wireless ad hoc networks have shown that directional MACs outperform against traditional omini-directional MACs. Those studies evaluate the performance mainly on simulations, where antenna beam is assumed to be ideal, i.e., with neither side-lobes nor back-lobes. Propagation conditions are also assumed to be ma...

Directional communication has the potential to improve the energy efficiency of wireless communication without sacrificing its quality. We present a system solution, BeamSwitch, for directional communication on mobile devices. BeamSwitch employs a special multi-antenna system that consists of multiple identical directional antennas, or beams, a single regular omni-directional antenna, and a sin...

Recent developments in the field of wireless communication systems are due to the development in field of Smart Antennas. These Antennas are capable of fulfilling high demand of data rate, capacity and also offers good quality of services to wireless communication systems. These characteristics can be obtained by increasing the gain of antenna in the desired direction; which is achieved by dire...

The digital beamforming antenna array is one of the most important components in wireless communication systems used in defence applications to improve the system capacity and spectral efficiency. The pattern synthesis of active antenna array is required in many defence applications like radar, satellite communication, sonar, mobile communication etc., where interference signals are considered ...

Abstract: This paper presents a miniaturized inverted fork patch antenna with ground plane. This design is a modified design of [1]. This design offer proper impedance matching of patch antenna with tremendously increased bandwidth (1 GHz). It reduces return loss of antenna and increases the gain of antenna. This antenna has been simulated at 2.67GHz frequency using CST software. This modified ...

This paper introduced a new low cost, compact and robust microstrip antenna based on metamaterial split ring resonator property to replace the existed antenna by small size and multiband Frequency antenna. The proposed antenna is designed with multi rectangular patches and simulated for different frequency. By using the metamaterial property, the bandwidth of the antenna has been improved. The ...

Several routing schemes have been proposed in the context of mobile ad hoc network. Some of them use multiple paths simultaneously by splitting the information among multitude of paths, as it may help to reduce end-to-end delay and perform load balancing. Multipath routing also diminishes the effects of unreliable wireless links in the constantly changing topology of ad hoc networks to a large ...

Any AM antenna system consists of the antenna itself, some sort of transmission line to convey the RF energy from the transmitter to the antenna, and some sort of impedance matching network. Directional antenna systems consist of multiple radiating elements, transmission lines and matching networks. In this paper, we will examine in building-block fashion the components that make up such system...

The design of a 400 M H z directional antenna for a space vehicle is presented. The design utilizes the spacecraft itself as an integral part of the antenna. The antenna has a gain of 4 dB over a dipole, a front to back ratio of 8 dB, and a -6 dB beam angle of 34“. Design equations and experimental data are presented.