Tech moves fast! Stay ahead of the curve with Techopedia!
Join nearly 200,000 subscribers who receive actionable tech insights from Techopedia.
A log-periodic antenna is an antenna that can operate on a wide frequency band and has the ability to provide directivity and gain. It has radiation and impedance characteristics that are repeated as a logarithmic function of excitation frequency. These antennas are fractal antenna (self-similar antenna) arrays.
A log-periodic antenna may also be referred to as a log-period array or a log-periodic beam antenna.
Log-periodic antennas were initially developed at the University of Illinois in 1955. They are capable of operating over a frequency range of 2:1. They are mainly used at the high frequency (HF) band of the spectrum. They are also used at very high frequency (VHF) and ultra high frequency (UHF) bands as TV antennas. The length and spacing of elements in a log-periodic antenna increase logarithmically from one end of the dipole to the other. The different types of log-periodic antennas include: