Title :
A hybrid differential/mode filtering technique for FDTD analysis of dual-polarization antenna feeds
Author :
Celuch-Marcysiak, M. ; Sypniewski, M. ; Gwarek, W.K.
Author_Institution :
Inst. of Radioelectron., Warsaw Univ. of Technol., Poland
Abstract :
A new technique for efficient analysis of dual-polarization antenna feeds has been developed. It combines conformal FDTD modelling of the structure, differential decomposition of total fields into incident and reflected, and filtering of the fields through numerical modal templates. The new technique has been validated for matched dual-polarization circular and ridged circular guides, even with coarse discretization producing accurate results. For the practical design of a septum polarizer, excellent agreement with the measurements has been obtained, and a critical parameter which is the 90/spl deg/ phase shift between the polarizations has been simulated with 0.5/spl deg/ accuracy.
Keywords :
antenna feeds; circular waveguides; electromagnetic wave polarisation; filtering theory; finite difference time-domain analysis; ridge waveguides; 90/spl deg/ phase shift; FDTD analysis; coarse discretization; conformal FDTD modelling; differential decomposition; dual-polarization antenna feeds; hybrid differential/mode filtering; incident field; matched dual-polarization circular guides; matched dual-polarization ridged circular guides; measurements; numerical modal templates; reflected field; septum polarizer; simulation; total fields; Antenna feeds; Electromagnetic radiation; Electromagnetic scattering; Filtering; Finite difference methods; Frequency; Horn antennas; Polarization; Scattering parameters; Time domain analysis;
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.1998.699204
