Abstract
In this paper, we propose, design and fabricate a kind of ultrathin and high-efficiency circularly polarization converter based on artificially engineered surfaces in the transmission mode. The converter is composed of double-layer periodic surface structures with cross slots. The top and bottom layers are printed on both sides of the F4B substrate and connected by metallic via holes. The proposed converter can transform the right-handed circularly polarized incident electromagnetic (EM) wave to a left-handed circularly-polarized one with near-unity efficiency in the transmission mode, or vice versa. We explain the conversion mechanism based on numerical simulations and equivalent circuit (EC) theory. The measured result has a good agreement with the simulated one in the working frequency band. Such ultrathin polarization converters can be used in wireless microwave communication, remote sensing, and EM imaging where circularly polarization diversity is needed.
Highlights
Polarization (CP) is one of the most important characteristics of EM waves and Circularly polarization (CP) has always attracted the attention of researchers in wireless and satellite communication [1]
The manipulation of CP converter is the ability to convert the polarization state of incident waves when it reflects or transmits through polarization converters, including linear-to-circular (LTC) polarization converter, which requires the generation of two orthogonal field components with a 90° phase shift between them, and circular-to-circular (CTC) polarization converter [2,3]
Traditional ways to achieve CP waves can be directly created by antenna [4]
Summary
Polarization (CP) is one of the most important characteristics of EM waves and CP has always attracted the attention of researchers in wireless and satellite communication [1]. Traditional ways to achieve CP waves can be directly created by antenna [4] Another alternative approach adopted in recent years is to use an LTC polarization converter positioned in front of the antenna, which radiates linearly polarized EM waves [5,6]. CP converter can convert incident waves with given right- or left-hand circularly polarized (RHCP or LHCP) state to versa state ones in the reflected or transmitted mode. Artificially engineered surfaces have been presented to design polarization converter which is capable of transforming the polarization of an incident wave to other polarization states [9,10]. The converter can realize transmission polarization conversion from right-handed circularly polarized incident EM wave to left-handed circularly polarized one. The measured results and simulated ones have good agreement in the entire frequency range
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