Novel Polarization Conversion Metasurface Based Circular Polarized Slot Antenna with Low Profile

Zhong, Tao; Hou, Zhi‐Ling; Xu, Haiyang; Chen, Qiang

doi:10.1109/csqrwc.2019.8799106

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…Therefore, the use of circularly polarized (CP) waves has become a necessity owing to its advantages compared with the LP waves (Lin et al 2020;Qi et al 2020;Fahad et al 2020). The most important advantage of CP waves is their high immunity against transmission-medium effects (Baghel et al 2019;Tao et al 2019;Chen et al 2018). To convert LP waves to CP waves, researchers have started designing a structure that can perform this conversion, which is called polarization converters.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: High-gain reconfigurable polarization antenna based on metamaterial array for Terahertz applications

2023

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This paper suggestsproposes a high-gain reconfigurable polarization antenna using a metasurface polarizaer. The metasurface polarizer is a rectangular array that consists of similar 25 unit-cell elements. Each metamaterial (MM) unit-cell element consists of a circular copper patch attached to two copper arrow-shaped strips installed at its circumference. The circular patch and two arrows are installed between a rectangular superstrate at the top and a rectangular substrate at the bottom, which is backed with a perfect electric conductor with a relative permittivity of εsub = 3.38. The MM characteristics are obtained in a wide range of frequencies from 1.4 to 2.1 THz. The metasurface polarizer array is installed at an optimized height of 25 μm under a linear polarized dipole antenna that operates at 1.81 THz with a bandwidth (BW) of 0.2 THz from 1.75 to 1.95 THz (11.05%, − 10 dB BW) and gain of 2.27 dBi. The incident-plane wave from the antenna can be converted into a reconfigurable left- or right-hand circular polarization according to the directions of the arrow of the MM unit-cell element. Moreover, the operating − 10-dB BW of the dipole antenna increases to 30.93%, and the gain is enhanced to 6.18 dBi at the same operating frequency. A reconfigurable polarization conversion for the dipole antenna can be obtained over wide 3-dB axial ratio BW from 1.45 to 1.95 THz (33.3% BW).

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Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: High-gain reconfigurable polarization antenna based on metamaterial array for Terahertz applications

2023

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“…The gain of the antenna in [17] was enhanced by 2 dBi thanks to applying a metasurface placed on the main radiation patch. The antennas in [17][18][19][20][21][22] also implemented a metasurface, but the special feature of these designs is that the metasurface is capable of re-polarization from LP (linear polarization) to CP. Thereby, we can see that using a metasurface is not only to reconfigure the polarization but also to increase gain.…”

Section: Antenna Designmentioning

confidence: 99%

A Wideband, High Gain and Low Sidelobe Array Antenna for Modern ETC Systems

Tran,

Khuat,

Phi

2023

ACES Journal

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Modern electronic toll collection (ETC) systems are currently moving towards a system design that is capable of fast and optimal payment handling for a single lane. Thus, the antenna of a roadside reader unit (RSU) needs to provide sufficient coverage over the vehicle lane during a payment cycle. In this paper, a left-hand circularly polarized (LHCP) 2×4 array antenna is proposed for European standard RSU readers at 5.8 GHz. The proposed array antenna consists of patch element antennas with parasitic elements to enhance gain and bandwidth. Sequential phase rotation feeding networks are applied to make the antenna low-profile. By using the optimized nut-shaped metasurface, the antenna can achieve higher gain due to concentrated radiation power in the boresight direction. The antenna has a wide impedance bandwidth of 2.34 GHz (37.73%), axis ratio bandwidth of 2.07 GHz (32.9%), high gain of 17 dBi, and sidelobe level (SLL) lower than -15 dB at 5.8 GHz. Especially, half-power beamwidths are 34∘ and 17∘ in horizontal and vertical planes, respectively, which covers sufficient space for a single lane while avoiding interference with other lanes. The performance of the proposed antenna is verified by measured results. It showed that the proposed antenna is a promising candidate for ETC applications.

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“…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]. To convert the LP wave to CP wave, the researchers started to design an aided construction that can obey that conversion which is called polarization converters.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Graphene-Based Metamaterial Polarization Converter for Terahertz Applications

Mabrouk

Donkol

Seliem

2022

Preprint

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This paper suggests a high gain polarization converter using a graphene-based metamaterial array. The graphene-based metamaterial polarization converter is a rectangular array that consists of 20 periodic unit-cell elements. Each graphene-based metamaterial unit-cell element consists of a rectangular patch with four triangular-shaped graphene parts at its four corners. The rectangular patch with the four graphene parts are placed over a rectangular substrate backed with a perfect electric conductor (PEC) and has a relative permittivity of εsub = 3.38. The metamaterial characteristics of the proposed graphene-based metamaterial unit-cell element are obtained over a wide range of frequencies of 0.7 THz ranging from 1.5 THz to 2.2 THz. The graphene-based metamaterial array is placed over a linear polarized slot antenna that operates at 1.8 THz with a maximum gain of 5.5 dBi. The linearly polarized wave that radiated from the slot antenna can be converted into a reconfigurable right-handed circular polarization (RHCP) or Left-handed circular polarization (LHCP) according to the biasing states of the graphene parts. Moreover, the operating -10 dB B.W of the slot antenna is increased to 22.2%, and the gain is enhanced to 8 dBi at the same operating frequency. A reconfigurable polarization conversion for the slot antenna can be obtained over a wide 3dB axial ratio (AR) B.W from 1.75 THz to 1.92 THz (20% 3dB B. W).

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Novel Polarization Conversion Metasurface Based Circular Polarized Slot Antenna with Low Profile

Cited by 11 publications

References 18 publications

RETRACTED ARTICLE: High-gain reconfigurable polarization antenna based on metamaterial array for Terahertz applications

RETRACTED ARTICLE: High-gain reconfigurable polarization antenna based on metamaterial array for Terahertz applications

A Wideband, High Gain and Low Sidelobe Array Antenna for Modern ETC Systems

Reconfigurable Graphene-Based Metamaterial Polarization Converter for Terahertz Applications

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