Ground Penetrating Radar (GPR) is a promising sensor for landmine detection, however there are two major problems to overcome. One is the rough ground surface. The other problem is the distance between the antennas of GPR. It remains irremovable clutters on a sub-surface image output from GPR by first problem. Geography adaptive scanning is useful to image objects beneath rough ground surface. ...

Recently, wireless-PAN systems using a UWB technique are considered. Antennas such as a planar trapezoidal monopole or dipole antenna for a UWB was developed.[1],[2] Since a 5 GHz band is allocated for wireless LAN service such as an IEEE802.11a, a UWB antenna should have a band notch to avoid an interference between two systems. To fulfil this requirement, several UWB antennas having a band no...

Planar inverted-F antennas (PIFA) are widely used in wireless hand-held devices due to their small-size, moderate bandwidth and radiation patterns. However, the radiation patterns of such antennas degrade when placed very close to a conductive finite ground plane. In this paper, an engineered magnetic superstrate is introduced to enhance the gain of PIFA antennas. The engineered magnetic supers...

Multiple Input Multiple Output (MIMO) becomes a key technology to achieve a higher data rates in wireless communication. The theoretical limit of MIMO capacity can be achieved by increasing the number of antennas at the transmitter and receiver. While increasing the number of antennas, receiver design becomes very much challenging. Maximum Likelihood Detector (MLD) provides a optimal performanc...

Jobs, M. 2015. Wireless Interface Technologies for Sensor Networks. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1216. 97 pp. uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-554-9136-9. The main focus of the work presented in this thesis concerns the development and improvement of Wireless Sensor Networks (WSNs) as well as Wireless Bod...

This article presents a comprehensive study of the various structured Dielectric Resonator Antennas (DRAs) and also analyzes the effects generated due to change in material of substrate. Dielectric resonator antennas (DRAs) have received increased attention in various applications due to their attractive features in terms of high radiation efficiency, light weight, small size and low profile. O...

We explore a full-duplex technique in wireless communication particularly for relay networks. We consider the relay to operate in full-duplex, which occurs when transmission and reception are conducted in the same channel. We investigate potential benefits of full-duplex technique in relay networks, which uses multiple antennas for transmission and reception combined with the Amplify-Forward (A...

We introduce a scheme that achieves a diversity gain for coded systems under static fading conditions by using multiple antennas and random signal mapping. In a two-antenna system, the BER performance of the proposed scheme approaches that of Alamouti’s scheme when the channel is perfectly known. In the presence of channel mismatch, the proposed scheme outperforms Alamouti’s scheme significantl...

Currently, cellular networks are one of the essential communication methods for people. Providing proper coverage for the users and also offering high-quality services to them are two of the most important issues of concern in cellular networks. The fifth-generation cellular communication networks can provide higher data transmission rates, which lead to a higher quality of service but this hig...

A brief review of metamaterials and their applications to antenna systems is given. Artificial magnetic conductors and electrically small radiating and scattering systems are emphasized. Single negative, double negative, and zero-index metamaterial systems are discussed as a means to manipulate their size, efficiency, bandwidth, and directivity characteristics. key words: metamaterials, electri...