Bacteria Foraging Algorithm in Antenna Design

Table 3

Design and performance parameters for the Yagi-Uda at 300 MHz with and without BFA optimization.

Element number ()	12-element Yagi-Uda (conventional)			12-element Yagi-Uda (optimized)
	Fixed design parameters: , ,  MHz; Optimized design parameters			Fixed design parameters: , ,  MHz; Optimized design parameters
	Length in m	Spacing in m	SWG	Length in m	Spacing in m	SWG
1	0.510		10	0.492	—	10
2	0.490	0.250	10	0.487	0.226	10
3	0.450	0.300	10	0.441	0.228	10
4	0.445	0.300	10	0.422	0.206	10
5	0.440	0.300	10	0.428	0.226	10
6	0.435	0.300	10	0.426	0.448	10
7	0.430	0.300	10	0.424	0.396	10
8	0.425	0.300	10	0.422	0.372	10
9	0.420	0.300	10	0.424	0.452	10
10	0.415	0.300	10	0.416	0.434	10
11	0.410	0.300	10	0.420	0.446	10
12	0.400	0.300	10	0.428	0.326	10
	Performance parameters			Performance parameters
1	(Ωs) =			(Ωs) =
2	DR (dB) = 12.670 (+-axis)			DR (dB) = 16.3391 (+-axis)
3	FTBR (dB) = 10.3248			FTBR (dB) = 18.2209
4	FSLL (dB) = 8.9446			FSLL (dB) = 12.3298
5	EHPBW (°) = 29.1124			EHPBW (°) = 24.6027
6	HHPBW (°) = 30.5694			HHPBW (°) = 25.3909
	Fitness value			Fitness value
FT	0.4008			0.2361