Table 1. Antenna I: Optimization results...

Table 1.

Antenna I: Optimization results

Target operating conditions F_t		Gradient-based optimization (5)		Iterative correction scheme (7)^b
f₁ [GHz]	f₂ [GHz]	Objective function value*	Optimization cost^a	Objective function value*	Optimization cost^a
2.10	4.80	–15.5 dB	9	–15.5 dB	3^$
2.30	4.00	–17.7 dB	11	–17.5 dB	3^$
2.45	5.10	–11.6 dB	6	–20.9 dB	3^$
2.50	4.75	–10.6 dB	10	–21.1 dB	3^$
2.70	4.50	–18.9 dB	11	–18.8 dB	3^$
3.00	5.00	–22.1 dB	11	–21.3 dB	3^$

Target operating conditions F_t		Gradient-based optimization (5)		Iterative correction scheme (7)^b
f₁[GHz]	f₂[GHz]	Objective function value*	Optimization cost^a	Objective function value*	Optimization cost^a
2.10	4.80	–15.5 dB	9	–15.5 dB	3^$
2.30	4.00	–17.7 dB	11	–17.5 dB	3^$
2.45	5.10	–11.6 dB	6	–20.9 dB	3^$
2.50	4.75	–10.6 dB	10	–21.1 dB	3^$
2.70	4.50	–18.9 dB	11	–18.8 dB	3^$
3.00	5.00	–22.1 dB	11	–21.3 dB	3^$

Notes:

*Objective function defined as the maximum reflection at both operating frequencies including their ±20 MHz vicinity. ^aThe cost in terms of the number of EM simulations required by the optimization process. ^bThe scheme complemented by gradient search according to (5)

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