ANN Synthesis Model of Single-Feed Corner-Truncated Circularly Polarized Microstrip Antenna with an Air Gap for Wideband Applications

Table 3

Comparison of the synthesis model constructed with MLPs and RBFNs.

Networks			MLP	RBFNs
Hidden layer configuration			15×20×4	100	200	300	400	500
Training time (seconds)			912	208	452	714	1032	1378
MRE (%)	𝐿	Training	1.56	356	347	214	132	61.8
		Test	1.55	225	191	115	528	1573
	𝐿𝑡	Training	2.05	260	196	59.5	65.6	29.3
		Test	2.19	148	118	55.9	158	471
ARE (‰)	𝐿	Training	0.206	71.7	39.9	29.3	21.5	16.4
		Test	0.224	70.3	39.8	31.0	26.6	28.1
	𝐿𝑡	Training	0.367	44.6	23.1	15.9	11.9	9.0
		Test	0.403	42.9	23.3	17.0	14.2	13.6
MSE (mm)	𝐿	Training	5.96×10^−4	51.4	16.2	9.15	5.32	3.24
		Test	8.13×10^−4	51.9	17.5	11.5	8.81	17.1
	𝐿𝑡	Training	4.23×10^−5	0.738	0.196	0.095	0.055	0.033
		Test	6.46×10^−5	0.731	0.224	0.130	0.092	0.124