Table 4
Parameters used in simulating the electric field propagation through (A) the frequency domain approach (Sect. 3.1) and (B) the finite element time domain (FETD) approach (Sect. 3.2).
| Frequency domain | Time domain | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Scale | Diameter | Distance | Method | Range | Relative size | Pulse | Center frequency | Relative size | Bandwidth |
| Itokawa | 535 m | 4.83 km | (A) | 0.766–6.90 MHz | 2.53–22.8 λ | Ricker | 2.30 MHz | 7.6 λ | 1.53 MHz |
| (B) | BH | 3.87 MHz | 12.8λ | 2.09 MHz | |||||
| (B) | BH | 4.92 MHz | 16.3λ | 2.20 MHz | |||||
| Analog object | 20.5 cm | 1.85 m | (A) | 2.00–18.0 GHz | Ricker | 6.00 GHz | 7.6 λ | 4.00 GHz | |
| (B) | BH | 10.1 GHz | 11.0λ | 5.45 GHz | |||||
| (B) | BH | 12.9 GHz | 14.8λ | 5.70 GHz | |||||
| Center frequency 10 MHz | 124 m | 1.12 km | (A) | 2.38–21.5 MHz | Ricker | 10 MHz | 7.6 λ | 6.67 MHz | |
| 207 m | 1.87 km | (B) | BH | 11.0λ | 5.40 MHz | ||||
| 264 m | 2.38 km | (B) | BH | 14.8λ | 4.42 MHz | ||||
| Center frequency 20 MHz | 62 m | 0.560 km | (A) | 4.76–42.2 MHz | Ricker | 20 MHz | 7.6 λ | 13.3 MHz | |
| 104 m | 0.935 km | (B) | BH | 11.0λ | 10.8 MHz | ||||
| 132 m | 1.19 km | (B) | BH | 14.8λ | 8.84 MHz | ||||
Notes. In the case of (A), the time domain data was obtained using the Ricker window and, in (B), the first time derivative of a quadrature amplitude modulated Blackman-Harris (BH) window. The dimensions are given in term of wavelengths, with λ, the wavelength in the medium having a permittivity of εr = 3.4 + j0.04 (interior part).
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