Millimetre wave antennas

A review is conducted of the major applications of millimeter waves in the military field, taking into account implications on the antenna design. Much of the impetus for the development of millimeter wave systems is due to the congestion of lower, microwave, bands and the need for larger bandwidths. A number of short range microwave systems which can take advantage of the possible size reduction and security through nonoverreach have been scaled up to the lower millimeter wave frequencies where existing antenna design techniques can still be employed. The majority of millimeter wave systems seek to exploit the higher resolution available over comparable microwave systems. High gain parabolic reflector antennas are, therefore, commonly employed at these frequencies. Attention is also given to horn antennas, array antennas, and future trends.