This report summarizes activities and results of a three year research projekt directed towards techniques for microwave radar systems. The focus has been on implementation and application of very compact active array antennas for radar. The concept is based on a tight integration of the antenna elements and feed electronics in a tie structure - a so called Smart Skin with applications such as multipurpose radars for fighter airplanes, UAV, land vehicle radars, ships etc. The result shows that it is possible to reduce complexity and volume of the feed electronics as well as architecture of the array antenna, potentially making the technique more affordable in the future. These condusions are based on the design and experimental evaluation of a small concept demonstrator. The evaluation shows excellent agreement with expected results. To investigate the possibilities to enhance the area of coverage, with the objective to improve the situation awareness, methods to design conformal antennas have been studied. Focus has been on developing methods for analysis and synthesis for future studies of conformal antennas. System design and signal processing have been studied in order to investigate applications of the technique. The research has focused on methods and algorithms for signal processing for radar and multifunction systems using digital beam forming array antennas. Various system concepts have also been developed.