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- MakaleYalnız künye2025Scopus SJRQ1Multi-functional, multi-band, low-profile, ultra-thin, and cost-effective metasurface-based polarization converter
Kaya, Yunus; Hasar, Ugur Cem; Ozturk, Hamdullah; Ozturk, Gokhan
This article presents a polarization converter (PC) that demonstrates linear polarization (LP) to LP (LP–LP), circular polarization (CP) to CP (CP–CP), and LP to CP (LP–CP) conversion performance in microwave C-band (4–8 GHz), X-band (8–12 GHz), Ku-band (12–18 GHz), and K-band (18–27 GHz). The designed converter performs LP–LP conversion in the frequency ranges of 6.414–6.771 GHz, 10.681–12.160 GHz, and 18.093–19.045 GHz, CP–CP conversion in the same frequency ranges (6.414–6.771 GHz, 10.681–12.160 GHz, and 18.093–19.045 GHz), and LP–CP conversion in the frequency ranges of 7.374–9.414 GHz and 13.792–16.777 GHz. It is single-layer, metasurface-based, reflection-type (because it consists of a metasurface-substrate-metal ground adaptation), multi-band (five bands), multi-functional (because it shows all three LP–LP, LP–CP, and CP–CP conversions), ultra-thin (with a substrate thickness of 1.6 mm (0.034λ)), low-profile, and cost-effective (since relatively cheaper and easily available FR4 dielectric material is used). Simulations for the designed PC have been carried out by the 3D full electromagnetic simulation program — the Computer Simulation Technology (CST) Studio Suite. The performance analysis of the designed converter was carried out according to the reflection coefficients in the frequency range of 4–21 GHz. It was fabricated using the traditional printed circuit board production method, and its performance was validated in microwave X-band by free-space microwave measurements. More information about the conversion mechanism of the converter was also provided by parametric study and surface current analysis. It is observed that the PC design, which has wide angular independence (50°), can be configured to be efficiently used in radar cross section (RCS) reduction and stealth applications.
AtıfScopus10WoS10OpenAlex8
İncele - MakaleAçık Erişim2024Ultra-thin Polarization Converter Using Single Layer Metasurface for X-, Ku-, and K-Band Applications
Arslan Madak, Seher Şeyma; Teber, Ahmet; Topkaya, Ramazan
In this article, an ultrathin (λ0/14.9), single layer, reflective type polarization converter for either linear-to-circular (LP-to-CP) or linear-to-linear (LP-to-LP) polarization conversion is reported. It has been demonstrated to achieve the LP-to-CP conversion at two separate frequency bands, including 11.52-11.84GHz and 19.83-20.01GHz. The circular polarization type is specified as a right-hand circular polarization (RHCP) for the first band and a left-hand circular polarization (LHCP) for the second band. In both of frequency bands, the metasurface structure reveals highly efficient features. Besides that, the metasurface structure exhibits highly efficient features within 3-dB bandwidths of 10.29-12.58GHz and 19.32-20.50GHz. Crucial parameters of polarization conversion such as ellipticity, axial ratio, and |Eco|/|Ecross| are confirmed to be in good agreement with another one. The metasurface structure's angular stability up to 200 oblique incidence angles makes it useful for beam scanning antennas. CST Microwave Studio program is utilized to carry out extensive simulations. This presented study offers a low cost, relatively high-performance, ultrathin polarization converter capable of linear-to-linear and circular polarization conversion in the X-, Ku-, and K-bands.
AtıfScopus2
İncele - MakaleAçık Erişim2023Scopus SJRQ2Cheaper, Wide-Band, Ultra-Thin, and Multi-Purpose Single-Layer Metasurface Polarization Converter Design for C-, X-, and Ku-Band Applications
Kaya, Yunus
This article presents the design of wide-band, ultra-thin, and multi-purpose polarization converter utilizing metasurface for C-, X-, and Ku-band applications. Having a topology on a FR-4 substrate with metasurface metallic patterns on the front and an all-metallic surface finish on the back, the unit cell of converter design has symmetry in the (Formula presented.) plane with unique features of having both linear polarization (LP) and circular polarization (CP) property. While the polarization conversion ratio (PCR) of converter in normal incidence case is more than 90% in three different frequency bands of 6.46–6.78 GHz, 10.52–11.85 GHz, and 16.49–17.37 GHz, it shows linear-to-linear polarization feature and a linear-to-circular polarization feature with left-handed circular polarization (LHCP) for the frequency range between 7.28 and 9.40 GHz and right-handed circular polarization (RHCP) for the frequency range between 13.38 and 15.19 GHz. It is also seen that the converter has a PCR value of around 90% for oblique incidence case with incidence angles up to 45 (Formula presented.). Extensive simulations have been conducted to prove the performance of suggested converter with the aid of a commercially-available simulation platform, called CST Microwave Studio. The advantages of suggested polarization converter are low-cost, wide-band, ultra-thin, and having both LP and CP conversion in C-, X-, and Ku-bands.
AtıfScopus13WoS10OpenAlex15İncele