Computation of Fields from a Magnetic Dipole in a Conductive Medium Using the QS-DGTD Method

ÖZAKIN M. B., Chen L., Ahmed S., Bagci H.

2019 International Applied Computational Electromagnetics Society Symposium in Miami, ACES-Miami 2019, Florida, Amerika Birleşik Devletleri, 14 - 18 Nisan 2019 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Florida
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Anahtar Kelimeler: Discontinuous Galerkin time-domain method, magnetic dipole, Quasi-static approximation
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

Loop antennas are often used for field generation in low-frequency electromagnetic applications. Since the antenna dimensions are much smaller than the wavelength, the antenna can accurately be replaced by its equivalent magnetic dipole model in simulations. In this paper, low-frequency magnetic dipole radiation fields in a conductive medium are computed using a three-dimensional discontinuous Galerkin Time-Domain (DGTD) scheme. It is shown that this computation can be accelerated using a material scaling scheme under Quasi-Static (QS) approximation, i.e., time step size can be scaled up without sacrificing from the accuracy and the stability of the time marching scheme. Radiated fields from a magnetic dipole in a conductive medium computed by this accelerated scheme are compared to those obtained using analytical expressions. Results are in good agreement.