Talk:Log-periodic antenna

message: Was " log-periodic antenna " in the first section a mistype?  Is there anything generically called a periodic antenna?  {Note that a the time of this edit, periodic antenna does not exist.}
According to the NTIA (http://www.its.bldrdoc.gov/fs-1037/dir-027/_3924.htm) it's "An antenna that has an approximately constant input impedance over a narrow range of frequencies. Note: An example of a periodic antenna is a dipole array antenna. Synonym resonant antenna." Colonies Chris 12:20, 9 June 2006 (UTC)
thread_title: Typo?

message: In the lead, the paragraph about self-similarity needs to be completely rewritten so that it speaks with one voice. That's why I put the cleanup tag at the top of the page. Binksternet (talk) 01:07, 26 August 2008 (UTC)
thread_title:  Self-similar or not 

message: It should look more like the Yagi-Uda article or the reference 
http://www.radio-electronics.com/info/antennas/log_p/log_periodic.php
There has got to be a good basic description that can be gleaned from an antenna text or similar source.
The self-similar / fractal stuff does not belong at all – it just adds noise. 
The best way to drive home the operation of a LPDA is to show an image of the current distribution from a moment-method calculation. I didn’t really grasp the concept fully until I saw one of these plots about 25 years ago.  It was excited at a frequency such that one of the middle elements was resonant and that element “glowed”  bright red in the plot. The element in front and behind this element was less-resonant and showed somewhat less current. The remaining elements had almost zero current on them. That image for me was worth 1000 words. Onoahimahi (talk) 16:20, 12 December 2010 (UTC)
thread_title:  This article should be rewritten 

message: No references I have (mostly ARRL antenna handbooks) put it in log-periodic, but one ("Some Notes on Two-Element Horizontal Phased Arrays—Part 3 The Limits of a Single Phase Line: The ZL-Special" by the late L.B. Cebik in the March/April 2002 NCJ at http://81.70.242.211/eab/manual/Magazine/National%20Contest%20Journal%20ARRL%20USA%20www.ncjweb.com/200203.pdf) puts it in the phased array camp; the same author said: 
:"Some call the ZL Special a 135° phased array because they think of the rear element as 180° minus the 45° twisted phase line out of phase with the front element. This is true with respect to impedance values found at each element. However, it is current magnitude and phase which determine the performance of the array, and the target ballpark for that current is 315° (which is also -45°) out of phase with the front element. The half twist of the phase line is equivalent to twisting the element itself 180° with respect to the front element, with an added 45° phase line between them."
I think it could be both, but that's just my thoughts.  There are very few authoritative books/texts that mention it... but a few Practical Wireless articles from way back IIRC - I should look 'em up. Thoughts? Maitchy (talk) 01:42, 9 June 2011 (UTC)
thread_title:  Is the ZL Special Log-periodic or Phased-array or both? 

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message: The SI system demands dB referenced to anything be written as such. dB alone is meaningless in context. dBd or dBi are appropriate with preference to the latter as the antenna world moved on from dBd quite some time ago. crcwiki (talk) 20:22, 5 May 2020 (UTC)
thread_title:  dB for antenna gain is mis-referenced