A Ka Dual-Band Circular Waveguide Polarizer
会议名称：《2006 7th International Symposium on Antennas, Propagation and EM Theory》
会议日期：2006年
学科分类：070207[理学-光学] 07[理学] 0702[理学-物理学]
关 键 词：Circular polarizer, dielectric septum, dual compensation slots.
摘 要：The design of a Ka dual-band circular polarizer by inserting a dielectric septum in the middle of the circular waveguide is discussed here. The dielectric septum is located in fixing slots, and by adjusting the dimension of the dual-compensation slots which are built in the orthogonal plane, the phase difference of 90° at the center frequency for the dual-band can be achieved. Furthermore, the gradual changing structures at both ends of the dielectric septum are built for impedance matching for both Ex and Ey polarizations. The simple structure of this kind of polarizer can reduce the influence of manufacturing inaccuracy in the Ka-band. The measured phase difference is within 90°± 4.5° for both bands. In addition, the return losses for both Ex and Ey polarizations are better than -15dB