Log-Periodic Antenna

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log-periodic antenna

[′läg ‚pir·ē¦ad·ik an′ten·ə]
(electromagnetism)
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 It might be outdated or ideologically biased.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 ?
The HL 562, which measures approximately 0.60 m x 1.65 m x 1.68 m, features a single-piece log-periodic array in order to maximise mechanical stability and is calibrated prior to delivery using the three-antenna technique combined with tolerance analysis.
Yet, other studies for a log-periodic array of narrow rectangular microstrip elements indicate that bandwidth at least as great as 50 percent can be achieved.[26] However, this technique suffers from nearly all the disadvantages of the quasi-periodic technique.
Mayes, "Log-Periodic Array of Dual-Feed Microstrip Patch Antennas," IEEE Trans.
Mayes, "Coplanar Waveguide Dual-Feed Patch Elements and a Log-Periodic Array Thereof," Electromagnetics Lab.
This limitation can be overcome by using the concept of log-periodic arrays for the design of wideband printed antennas [5].
A critical point in the design of printed log-periodic arrays is the modeling of the feeding network [11].
Design procedures for Yagi-Uda and log-periodic arrays, horns and microstrip patches are described, as well as techniques using the Schelkunoff, Fourier transform, Woodward-Lawson, Tschebyscheff and Taylor methods.