Log-Periodic Antenna

What Does Log-Periodic Antenna Mean?

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.

Techopedia Explains Log-Periodic 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:

  • Slot-log periodic antenna
  • V-log periodic antenna
  • Zig-zag-log periodic array
  • Trapezoidal-log periodic antenna
  • Log-periodic dipole array

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Margaret Rouse
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Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.