Near-field dipole radiation dynamics through FDTD modeling

Dipole Radiation Near Anisotropic Low-Permittivity Media

“…The slight discrepancy and ringing effects in the patterns are well known for finite size simulations and have previously been demonstrated and studied for the dielectric half-space problem [16,21]. The fullwave simulation results in fact converge to the ideal far-field results for larger observation spheres around the dipole.…”

“…Other effects such as subsurface peaking was also explored by the same authors in [14]. Such studies have been intended for various applications such as Ground Penetrating Radar [15,16], antennas for communication above earth or under water [2,13], antennas on semiconductors [9] or above dielectrics for imaging [12], to only name a few.…”

“…The poor convergence of Sommerfeld type integrals has been an important reason for devising various efficient techniques for solving these types of problems as done in [17] and using integral equations solved with the Method of Moments [18,19], and exact solutions such as [20]. Finite Difference Time Domain (FDTD) methods have also been used to analyze radiation patterns of such scenarios [16,21], analyzing both the near-field [21] and the far-field [16,21], pointing out some ripple effects on the patterns obtained due to finite observation distances. Effects of lateral waves were also explored in works such as [16,22,23].…”

“…Finite Difference Time Domain (FDTD) methods have also been used to analyze radiation patterns of such scenarios [16,21], analyzing both the near-field [21] and the far-field [16,21], pointing out some ripple effects on the patterns obtained due to finite observation distances. Effects of lateral waves were also explored in works such as [16,22,23]. Other time domain techniques have also been used for solving the problem of a source above a lossy half-space as in [24].…”

Three-dimensional Finite-difference Time-domain Modeling of Ground-penetrating Radar Survey for Detection of Underground Cavity

“…FDTD을 이용 하여 GPR 반응을 모사하여 안테나 방사 분석 (Bourgeois and Smith, 1996;Roberts and Daniels, 1997;Bergmann et al, 1998;Nishioka et al, 1999;Radzevicius et al, 2003), 시추공 토모그래피 (Holliger and Bergmann, 2002), 비파괴실험 (Giannopoulos and Dimanti, 2008), 지뢰탐지 (Giannakis et al, 2016) 등 여러 분야에서 응용된 사례가 발표되었다. GPR 탐 사 모델링에서 FDTD 기법의 사용은 다른 EM 모델링 방법과 비교하면 다음과 같은 많은 장점이 있다 (Roberts and Daniels, 1997;Cassidy, 2007): (Sullivan, 2000;Jang et al, 2007).…”