On Mon, 25 Sep 2006 20:02:11 -0000, Dave Platt
wrote:
The elevation pattern of the antenna shows a hint of the high-angle
secondary lobes which characterize an EDZ.

This is definitely noticable on a log plot.

So, I'd conclude that you've developed a variant on the EDZ (or
something partway between an EDZ and a center-fed fullwave) which
yields slightly lower gain than an EDZ but has a simpler matching
section.

What sort of gain is expected from an EDZ? I tweaked the topology
of my design a bit in the hope of getting a broader bandwidth, but
instead got even more gain. For example, the version represented
below has a minimum gain of more than 4.7 dBi (at the side) and more
than 5.25 dBi in the forward direction. Previously I reported gain
values that ran from 4.2-4.7 dBi. So this one represents a bit of an
improvement. I may try building it this weekend. Thanks, --John

CM Model: expt5
CM parms = [4.68255, 3.41606, 36.4806, 7.22131, 11.9807, 3.02775, ];
CM
CM A1: 4-11/16 in.
CM A2: 3-7/16 in.
CM B1: 36-1/2 in.
CM B2: 7-1/4 in.
CM C: 12 in.
CM D: 3 in.
CM Wire diameter: 0.0640837
CM COM: (0 in., 9-1/16 in., 0 in.)
CM BBOX: dX=0, dY=11.9807, dZ=90.4316
CM COM Turning radius: 9.06615
CM Min Turning radius: 5.99035
CE
GW 1 3 0 0 9.10555 0 0 9.18245 0.000813863
GW 2 7 0 0 9.18245 0 0.30431 9.18245 0.000813863
GW 3 19 0 0.30431 9.18245 0 0.30431 10.1091 0.000813863
GW 4 5 0 0.30431 10.1091 0 0.30431 10.2925 0.000813863
GW 5 3 0 0.30431 10.2925 0 0.185373 10.2925 0.000813863
GW 6 3 0 0.30431 10.1091 0 0.217542 10.1091 0.000813863
GW 7 7 0 0 9.10555 0 0.30431 9.10555 0.000813863
GW 8 19 0 0.30431 9.10555 0 0.30431 8.17894 0.000813863
GW 9 5 0 0.30431 8.17894 0 0.30431 7.99552 0.000813863
GW 10 3 0 0.30431 7.99552 0 0.185373 7.99552 0.000813863
GW 11 3 0 0.30431 8.17894 0 0.217542 8.17894 0.000813863
GE 0
FR 0 201 0 0 144 0.02
EX 0 1 2 0 1
GN -1 0 0 0 0.0 0.0 0.0 0.0 0.0 0.0
RP 0 1 73 1001 90, 0, 1, 5
EN