A 3.5 Octave LPDA of High Potential Performance
But an Antenna that No One Will Build

A Gallery of Performance Graphics

L. B. Cebik, W4RNL





The following graphics show the free-space azimuth patterns and the relative current magnitudes for the two designs discussed in the linked note. The "60-Element" design provides patterns for all bands, while the "64-Element design shows patterns only for the uppermost bands--where the graphics differ from those of the 60-Element design.

Among other things, one might well note the rear azimuth patterns for all of the frequencies checked. Perhaps more important, note the number of active elements for each band and the relationship On the uppermost bands) of the antenna performance to the number of active elements forward of the one with the highhest relative current magnitude.

60-Element LPDA

3 MHz:

3.5 MHz:

4 MHz:

7.15 MHz:

10.125 MHz:

14.175 MHz:

18.118 MHz:

21.225 MHz:

24.94 MHz:

28 MHz:

28.5 MHz:

29 MHz:

29.5 MHz:

30 MHz:

64-Element LPDA

21.225 MHz:

24.94 MHz:

28 MHz:

28.5 MHz:

29 MHz:

29.5 MHz:

30 MHz:

Updated 04-14-2000. L. B. Cebik, W4RNL. Data may be used for personal purposes, but may not be reproduced for publication in print or any other medium without permission of the author.

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