Ultra-Thin Metasheet for Dual-Wide-Band Linear to Circular Polarization Conversion With Wide-Angle Performance

Abstract

Satellite communication systems require dual-band circularly polarized (CP) waves to integrate receiving and transmit antennas into one dual-band terminal. Polarization converters play an important role in such a scenario to convert the incoming linearly polarized (LP) signal into the transmitted CP signal. Wide-band and wide-angle performance for the transmission based dual-band polarization converters has been a challenge. In this paper, a transmission-based linear polarization to circular polarization (LP-to-CP) converter is presented using a very simple and thin metasurface based structure. The proposed metasheet is uni-layered, patterned with a circular diagonal split ring enclosed in the square ring. The idea for dual-band polarization conversion is verified with an example in which x(y) polarization is converted into LHCP(RHCP) in Ku-band (15.25~18.9 GHz), and RHCP(LHCP) in Ka-band (29.7~36.7GHz). The converter performs polarization conversion for both bands over 21% of bandwidth which is very wide. Moreover, it maintains performance over wide-angled oblique incidences. Dual-band performance is analyzed theoretically, numerically, and experimentally. The equivalent circuit model is also presented for the unit cell. This metasheet has simple and low-cost design, wide polarization conversion bandwidths, polarization diversity, and wide-angle performance which are very promising for future communication systems.

Easy‐to‐Implement Ultra‐Thin, Wide‐Band, and Multi‐Functional Polarization Converter for K and Ka Band Applications

“…We also compared the efficiency of our proposed polarization converter with those of the polarization converters in the transmission mode. [ 9,10 ] When our proposed polarized converter is compared with those in the studies, [ 9,10 ] it is noted that our proposed method has both LP to CP conversion and CPC conversion, while the polarization converters in the studies [ 9,10 ] have only LP to CP conversion. Besides, our proposed polarization converter design has a very broad frequency band (between 17.87 and 43.15 GHz) over which its PCR value is above 90%.…”

Single-Layered Frequency Selective Surface for Polarization Processing by Transmission Through Elementary Simple Structure Unit Cell Array

“…The converter reported in [2] works in the 6-12 GHz band with an IL of 2.5-3 dB, a 53% AR bandwidth, and an angular stability of 30o. The more recent work [21] introduces a structure with dualband polarization conversion at 17.2 GHz and 34.2 GHz, with 45 • and 30 • angular stability respectively, and 21% AR bandwidth (IL not readily available).…”

“…A single layer, dual band polarization converter has been proposed in [21]. It provides opposite circular polarization for incident linear polarization in the Ku band (17.2 GHz) and Ka band (34.2 GHz), with AR bandwidth of 21% and angular stability of 45 • and 30 • respectively.…”

Reconfigurable Graphene-Based Metamaterial Polarization Converter for Terahertz Applications

“…Also, from the drawbacks of LP waves multipath fading during transmission and the orientation of the antenna at the receiving side. So, the need for using circularly polarized waves became a necessity because of its advantages compared to the LP waves [14][15][16]. The most important advantage of the CP is its high immunity against the transmission medium effects [17][18][19].…”