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

Table 2

Comparison of MLP-based synthesis model with different hidden layer configurations.

Configuration of hidden layers				Two hidden layers			Three hidden layers
			15×14	15×20	15×26	15×20×2	15×20×4	15×20×6
Training time (seconds)			606	871	1146	827	912	1074
MRE (%)	𝐿	Training	2.56	2.25	5.16	2.04	1.56	1.19
		Test	3.37	2.30	5.66	1.41	1.55	1.35
	𝐿𝑡	Training	7.82	4.12	3.88	2.87	2.05	1.29
		Test	10.3	5.14	13.3	2.03	2.19	3.48
ARE (‰)	𝐿	Training	0.491	0.473	0.754	0.288	0.206	0.190
		Test	0.519	0.486	0.820	0.298	0.224	0.221
	𝐿𝑡	Training	0.928	0.846	0.140	0.505	0.367	0.387
		Test	0.968	0.871	0.141	0.540	0.403	0.415
MSE (mm)	𝐿	Training	3.60×10^−3	3.43×10^−3	7.85×10^−3	1.15×10^−3	5.96×10^−4	5.17×10^−4
		Test	4.77×10^−3	4.17×10^−3	9.94×10^−3	1.31×10^−3	8.13×10^−4	8.09×10^−4
	𝐿𝑡	Training	2.95×10^−3	2.46×10^−4	6.39×10^−4	8.90×10^−5	4.23×10^−5	5.07×10^−5
		Test	3.38×10^−3	2.62×10^−4	7.71×10^−4	1.11×10^−4	6.46×10^−5	6.27×10^−5