Title :
Cylindrical coordinates FD-TD analysis of cylindrical microstrip GPS antennas for ships
Author :
Morita, N. ; Hata, S. ; Kazama, Y. ; Teshirogi, T.
Author_Institution :
Chiba Inst. of Technol., Narashino, Japan
Abstract :
A cylindrical coordinates FD-TD algorithm is developed for analysing antennas whose structure mainly consists of circular and/or cylindrical shapes. The absorbing boundary condition scheme employed is that of Berenger´s (see J. Compt. Phys., vol.114, p.185-200, 1994) PML (perfectly matched layers) algorithm adapted to the cylindrical coordinates. The model for excitation is that of a coaxial line inside which the voltage and current are are calculated by a one dimensional FD-TD method. The algorithm is applied to the analysis of circular polarization cylindrical microstrip antennas (MSA) with a wide hemispherical beam radiation pattern, the GPS antenna for ships. The results agree very accurately with those of the experiment.
Keywords :
Global Positioning System; antenna radiation patterns; electromagnetic wave absorption; electromagnetic wave polarisation; finite difference time-domain analysis; microstrip antennas; mobile antennas; ships; Berenger´s PML; D-TD algorithm; absorbing boundary condition; circular polarization; circular shape; coaxial line; current; cylindrical coordinates FD-TD analysis; cylindrical microstrip GPS antennas; excitation model; experiment; perfectly matched layers; ships; voltage; wide hemispherical beam radiation pattern; Algorithm design and analysis; Antenna radiation patterns; Boundary conditions; Coaxial components; Microstrip antennas; Pattern analysis; Perfectly matched layers; Polarization; Shape; Voltage;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1998. IEEE
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-4478-2
DOI :
10.1109/APS.1998.701609
