Preface

Abstract

The first 2007 issue is constituted of papers dealing with the subject of modern trends in the development of  microwave techniques, antenna and satellite technology. The significant cluster of papers covers the field of smart, ring and phased array antennas and their applications and equipment, as well as issues connected with satellites and radars. 
The future wireless systems have to be equipped with multiband and wideband smart antennas in order to provide high speed data transmission and avoid undesired interference. The beam-forming techniques used in the narrowband systems are unsuitable for wideband counterparts as they cause such adverse effects as main beam squinting and null shifting. The use of the radar adapting wideband beam and null steering methods is unattractive for communication systems because of both, high complexity and the cost of the systems. In order to overcome this obstacle, the fully spatial wideband beam forming techniques can be applied in designing of the wideband smart antennas. (...)