antenna array is an antenna that is composed of more than one
conductor. There are two types of antenna arrays: arrays – all
elements in the antenna are fed RF from the transmitter arrays –
only one element is connected to the transmitter. The other
elements are coupled to the driven element through the electric
fields and magnetic exist in the near field region of the driven
element are many types of driven arrays. The four most common
types are: Log Periodic Array collinear array consists of l/2
dipoles oriented end-to-end. The center dipole is fed by the
transmitter and sections of shorted transmission line known as
phasing lines connect the ends of the dipoles as shown below.
The length of the phasing lines are adjusted so that the
currents in all the dipole sections are in phase, as shown
below. The input impedance of a collinear array is approximately
300 ohms. The directivity of a collinear array slowly increases
as the number of collinear sections is increased. A broadside
array consists of an array o