ABSTRACT
Antenna arrays are groups of similar antennas arranged in var-ious spatial configurations with relative amplitude and phase between the exciting currents or fields driving adjacent antennas chosen to give a desired radiation pattern. We will concentrate in this chapter on arrays of half-wave dipole antennas; however, many of the features of array radiation that will be uncovered are universally applicable to arrays of any type of antenna as will become clear. The chapter will conclude with a discussion of microstrip patch antennas that can be fabricated by inexpensive lithographic techniques and are replacing aperture antennas in many applications; microstrip patch antennas can be analyzed as a two-dimensional array of dipole antennas.
