Freq - Frequency of wave
C - Speed of Light (3 x 108)
Far field Distance - The far-field distance is the distance from the transmitting antenna to the beginning of the Fraunhofer region or far-field. In the far-field, the radiation pattern does not change shape as the distance increases.
Dipole antenna is the most basic antenna used in broadcasting and receiving radio frequency signals. It consists of two conductors of equal length oriented end-to-end with the feedline connected between them. The length of the radiating elements determines many of the properties of the dipole antenna: its feed impedance, center operating frequency, whether it is a resonant antenna, etc. As such the dipole length is an important aspect of the dipole antenna parameters.
Log-Periodic antennas are multi-element directional antennas used for operating in a wide range of frequencies. The most common Log- periodic antenna used are LPDA(Log-Periodic Dipole Array) antennas which is a combination of a dipole antenna and log-periodic antenna. The construction and operation of a log-periodic antenna are similar to that of a Yagi-Uda antenna. The main advantage of this antenna is that it exhibits constant characteristics over a desired frequency range of operation.