TABLE 1.

SNR comparison of the single ceramic probe, the solenoid probe and the dual ceramic probe, in numerical simulations and experiments.

	$\frac{{\mathrm{SNR}}_{1\mathrm{DR}}}{{\mathrm{SNR}}_{\mathrm{sol}}}$	$\xi =\frac{{\mathrm{SNR}}_{1\mathrm{DR}}}{{\mathrm{SNR}}_{2\mathrm{DRs}}}$	$\frac{{\mathrm{SNR}}_{2\mathrm{DRs}}}{{\mathrm{SNR}}_{\mathrm{sol}}}$
Numerical simulations	1.95 ≈ 2	$1.41\approx \sqrt{2}$	1.38
Experimental results	2.2	1.53 (DR1) 1.32 (DR2)	1.47 (DR1) 1.70 (DR2)