Open AccessRadiation characteristics of circular waveguide antenna loaded with ferrite rod
Author(s) -
Sheikh Sharif Iqbal Mitu,
Algarni A.M.,
Ragheb Hassan
Publication year - 2016
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2015.0569
Subject(s) - hfss , ferrite (magnet) , materials science , optics , waveguide , smith chart , acoustics , antenna (radio) , physics , engineering , electrical engineering , microstrip antenna , electrical impedance , impedance matching , composite material
High power waveguide antennas are widely used for military and commercial application. In this study, a magnetised ferrite rod loaded circular waveguide antenna (CWA) is presented, where the main beam is steered by varying the external magnetising field ( H 0 ). To predict the limitations of this multimode antenna, the modes supported by the structure and the lossy ferrimagnetic resonance region needs to be calculated. An analytical technique, based on boundary values, is used to derive six characteristic equations for the partially ferrite loaded CWA. The non‐trivial solution of the equations is used to plot the mode chart and identify the low‐loss operating region. Using HFSS simulator, the coaxially excited ferrite loaded CWA is optimised to demonstrate a beam scan up to ±30° for H 0 = ±142 KA/m. Experimental results are used to verify the simulated scan characteristics of the antenna.