Phase-Controlled Antennas, Patch Antennas, Measurement Technology

Electronically controlled or phased array antennas are increasingly being used in radar technology. With these, the antenna pattern is not swiveled mechanically, but by means of a phase control of a group of individual radio emitters. The advantage of such antennas is that the antenna beam can be swiveled much faster compared to a mechanically swiveling antenna. This chapter also introduces the frequently used patch antennas. It also explains how a chaotic design can reduce sidelobes immensely and briefly describes the basic antenna measurement technology