Millimeter-wave antennas

With the continually increasing demand for bandwidth, and the development of components for higher and higher frequencies, millimeter-wave systems are finding numerous applications of a commercial nature rather than being limited to military and scientific applications only. Since active device performance deteriorates with increasing frequency, the performance of the antenna becomes critical as we go higher into the millimeter-wave band. This paper presents a review of some of the recent devlopments in the field of millimeter-wave antennas. Finally, some details of a specific antenna for imaging are given, illustrating the benefits and challenges of fabricating such antennas.