Double-layer broadband circular polarizer based on fission transmission of linear polarization for ku-band applications

What is it about?

A double-layer broadband circular polarizer based on fission transmission of linear polarized (FTLP) for Ku-band applications is presented. Firstly, the novel approach of “fission transmission of linear polarization” is introduced to investigate the polarization transformation behaviour (giant CD effect and optical activity) for linear-to-circular polarization. The designed structure achieves broadband circularly polarized wave with asymmetric transmission (AT) wave emission under the principle of (FTLP). The proposed structure achieves a right-handed circularly polarized (RHCP) wave at 13.94–15.70 GHz, respectively. The axial ratio bandwidth of 11.76% is obtained from 13.94 to 15.70 GHz. The simulated and measured results exhibit good correspondence.

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Why is it important?

First, the novel approach of “fission transmission of linear polarization (FTLP)” is presented, which transforms linearly polarized (giant optical activity) wave into circular polarized (strong circular dichroism) wave. It means that the incident linearly polarized wave is decomposed into two components through bottom-layer and impinge on the upper-layer along 1z direction. Consequently, the two decomposed linearly polarized wave from bottom-layer are used as excitation source for upper-layer. Finally, the two pairs of orthogonal components emerge at the end of structure and converted in circular polarization. This incidence and transmission sequence of the orthogonal components sustains the chain transmission of EM wave. The high transmission efficiency and axial ratio bandwidth are the good advantages of proposed design which are relatively better than most of the reported work. The designed structure is simple and can be easily fabricated. Meanwhile, the double-layer broad-band circular polarizer is also suitable to design the application of microwave devices and scaled into higher frequencies ranges.