Log-Periodic Antenna

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log-periodic antenna

[′läg ‚pir·ē¦ad·ik an′ten·ə]
A broad-band antenna which consists of a sheet of metal with two wedge-shaped cutouts, each with teeth cut into its radii along circular arcs; characteristics are repeated at a number of frequencies that are equally spaced on a logarithmic scale.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Log-Periodic Antenna


a type of a frequency-independent antenna with periodic repetition of the ratios of the characteristic dimensions of the adjoining components. The repetition obeys a logarithmic law in such a way that the ratio between the wavelength of the electromagnetic oscillations being radiated and the characteristic dimensions of the excited part of the antenna remains virtually constant over a wide frequency range.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Log periodic antennas can be purchased at ham radio supply stores.
For example, a conventional log periodic antenna can easily be designed to provide low SWR over several octaves of frequency.
The original issue of IEC 61000-4-3 defined the test distance as 3 meters from the uniform plane to the tip of a log periodic antenna or to the balun of a biconical antenna.
For example, the Amplifier Research Model AT5026 Log Periodic Antenna is designed for frequencies from 26 MHz to 5 GHz and measures 279 X 54 X 202 cm.
A heavy-duty, non-conductive support and positioner is available for high gain, log periodic antennas. The model AP5010 positioner is compatible with antenna models AT-2526 covering the frequency range of 26-250 MHz and 15 kW input power and AT5026 covering the frequency range of 26-5000 MHz with an input power of 5 kW.
The log periodic antennas are common examples of this category.