RE:NEC-LIST: 4NEC2 Optimizer

Dear Mike

I have optimised a couple of yagi's using SuperNEC's Genetic Algorithm
optimiser(some of my MSc work) and I have listed the results below. Most of
the results were nice and broadband with very good Gains and VSWR's .Please
contact me if you require any of the antenna parameters for any of the
designs listed.
All the yagi designs below use elements with a 0.008m radius, a folded
dipole feed, directors of all equal length, spacing between directors all
equal, and the design frequency was set to 300Mhz (you can always scale the
designs for the right operation frequency) .

-5 element yagi(vswr for 75ohms)
Gain BW 22.3% VSWR<2 BW 8.7% gain @ 300Mhz 10.19dBi
Gain BW 21.7% VSWR<2 BW 5% gain @ 300MHz 10.4dBi

-6 element yagi (VSWR for 75ohms)
Gain BW 14% VSWR<2 BW 5.7% gain @300MHz 11.62dBi

-12 element yagi (VSWR for 200 Ohms)
Gain BW 29.3% VSWR<2 BW 20% gain @300MHz
12.11dBi

-15 element yagi (VSWR for 200 Ohms)
Gain BW 11.3% VSWR<2 BW 11.3% gain @ 300MHz 15.38dBi
Gain BW 14% VSWR<2 BW 12.7% gain @ 300MHz 14.61dBi

-17 element yagi (VSWR for 200Ohms)
Gain BW 15.7% VSWR<2 BW 11% gain @ 300MHz 14.59dBi
Gain BW 17.3% VSWR<2 BW 12.7% gain @300 MHZ 13.97dBi

where %gain BW = ((Fh-Fl)*100)/Fc
where Fc=300MHz(design frequency) Fh=highest frequency at which gain is 3dB
lower than gain at Fc and
Fl=lowest frequncy at which gain is 3dB lower than gain at Fc

Regards,
Brandon

-- 
The NEC-List mailing list <nec-list_at_gweep.ca>
http://www.gweep.ca/mailman/listinfo.cgi/nec-list