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 holl_ands | Home > LPDA + ZigZagLPA Antennas  
LPDA + ZigZagLPA Antennas
LPDA (Log Periodic Dipole Array) and Zig-Zag LPA (Log Periodic Array) Antenna performance analyzed using 4nec2.
Date(s): December 23, 2008. 1 - 6 of 6 Total. Shared
UHF LPDA
1. UHF LPDA  (8 Dec 2011)
UHF Log Periodic Dipole Array (LPDA) Antennas analyzed using 4nec2.
All are 75-ohms Impedance, except as noted below.

Although analyzed using Zig-Zag Feedlines, Raw Gain should be close if using Dual-Boom Feedline,
although the actual SWR will depend on the Boom dimensions, so construct a detailed model.
8 Albums
Shared Folder
Hi-VHF LPDA
2. Hi-VHF LPDA  (December 24, 2008)
Hi-VHF Log Periodic Dipole Array (LPDA) Antennas analyzed using 4nec2.

ZS6BTE's Hi-VHF 14-Element LPDA for comparison to Zig-Zags.
Element lenghts and spacings are same as in Zig-Zags.
2 Albums
Shared Folder
VHF LPDA
3. VHF LPDA  (25 Aug 2013)
VHF (Ch2-13) Log Periodic Dipole Array (LPDA) Antennas analyzed using 4nec2.
2 Albums
Shared Folder
ZigZagBoom
4. ZigZagBoom  (December 24, 2008)
Zig-Zag LPAs with Center Boom.
1 Albums
Shared Folder
ZigZagNoBoom
5. ZigZagNoBoom  (December 23, 2008)
Wedge Zig-Zag (No Center Wires or "Booms").
Phi=18 degrees (et. al) are optimized for 300-ohm load, using Quarter Inch Tubing or RG cable.

Stacked Zig-Zag is lower (1-2 dB) Gain version when space is not available for Wedge.

EDIT (22Jun2009): Added details for Building and Attic Installation for Hi-VHF Zig-Zag LPA.  More to come.....
3 Albums
Shared Folder
FM Stacked ZigZag - As Built About 1967
6. FM Stacked ZigZag - As Built About 1967  (December 16, 2008)
FM Band, Stacked Zig-Zag Log Periodic Array, using Saw-Tooth RG-59 Wire Elements.
On higher frequencies, Gain is very low and Impedance is TOO HIGH!!
Does not appear to be very well optimized.
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15 Images
Shared Album