c. The importance of knowing the polarization of an antenna is this: a
receiving antenna usually picks up more energy when it is polarized the same
horizontal, because the TV transmitting antennas are horizontal.
d. That completes the brief review of antenna fundamentals. Now, let's
The two main ones that apply
these antenna properties work together.
Directivity and radiation pattern.
a. A directive antenna radiates energy in only one direction
receives energy from only one direction.
If the antenna radiates
receives signals in many directions, it has poor directivity.
antenna transmits and receives signals from only one direction, it has
b. Figure 134 shows how energy radiates in all directions from a dipole
When used to represent a receiving antenna, the
pattern indicates the areas from which signals will be received.