Single-Layer Dual-Band Linear-to-Circular Polarization Converter With Wide Axial Ratio Bandwidth and Different Polarization Modes

Wang, Hong Bin; Cheng, Yu Jian

doi:10.1109/tap.2019.2905962

Cited by 154 publications

(71 citation statements)

References 29 publications

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“…The goal is to maximize the transmission at two frequencies and shape the AR response according to the project specifications. Multi-layer FSS-based structures have been proposed operating either in reflection [19]- [23] or transmission [24], [25]. In [25], the entries of ECMs are obtained by performing optimizations in Keysight Advanced Design System (ADS) [28].…”

Section: Introductionmentioning

confidence: 99%

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Dual-Band, Orthogonally-Polarized LP-to-CP Converter for SatCom Applications

Mastro¹,

Ettorre²,

Grbic³

2020

IEEE Trans. Antennas Propagat.

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A systematic design of dual-band, orthogonallypolarized linear-to-circular polarization (LP-to-CP) converters is proposed. This class of polarization converters can transform linearly-polarized waves into right-and left-hand circularlypolarized (RHCP and LHCP) waves in two separate non-adjacent frequency bands. The reported polarizer is made of three cascaded bianisotropic sheet admittances, spaced by two isotropic dielectric slabs. The electromagnetic problem is studied by means of impedance boundary conditions. A transmission-matrix analysis of periodically-loaded transmission-lines is employed in design. An analytic model is developed and closed-form expressions are derived for the frequency response of each sheet admittance. This method avoids the use of multi-parameter optimization procedures. An example of a dual-band, orthogonally-polarized LP-to-CP converter is proposed for satellite communication applications in the K/Ka-band. The polarizer separately performs LP-to-LHCP and LP-to-RHCP conversions over the transmitting and receiving channels of the K/Ka-band. The design is validated with a prototype. Under normal incidence, the polarizer exhibits axial ratios (ARs) lower than 3 dB over the 18-22.2 GHz (∼21%) and 28.7-30.4 GHz (∼6%) bands. The total transmission is above-1 dB within the same two bands. The performance is stable for scanning angles up to ±45 •. For a 45 • angle of incidence, the AR is lower than 3 dB in the bands 17-22 GHz (∼25.6%) and 28.6-30 GHz (∼4.7%) with a total transmission higher than-1.2 dB.

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Section: Introductionmentioning

confidence: 99%

“…Multi-layer FSS-based structures have been proposed operating either in reflection [19]- [23] or transmission [24], [25]. In [25], the entries of ECMs are obtained by performing optimizations in Keysight Advanced Design System (ADS) [28]. The ECMs of [24] have been recently presented in [26], but they refer to a given unit cell's geometry.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band, Orthogonally-Polarized LP-to-CP Converter for SatCom Applications

Mastro¹,

Ettorre²,

Grbic³

2020

IEEE Trans. Antennas Propagat.

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“…In the past, many diagonal symmetry/semi-symmetric anisotropic structures have been proposed for single band LP-to-CP conversion [41][42][43][44][45]. Dual band LP-to-CP operation has been achieved using center-connected [38] and semi-diagonal symmetric [37] structures. Symmetric structures with horizontal and vertical axis symmetry cannot be a choice for LP-to-CP operation because the electric response for such components at normal incidence and horizontal polarization will not generate a vertical component [42].…”

Section: Designmentioning

confidence: 99%

“…However, if for a certain frequency range these transmission coefficients become comparable and their phase angles are 90 • apart, i.e., t xx = t xy and ϕ xy = 2nπ ± π/2, with n being an integer, then the conditions for linear-to-circular polarization conversion will be met. In order to describe the transmission conversion performance of the proposed structure, the axial ratio for the transmitted wave is calculated as given in Equation (6) [38]:…”

Section: Principle Of Operationmentioning

confidence: 99%

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Dual-Wide-Band Dual Polarization Terahertz Linear to Circular Polarization Converters based on Bi-Layered Transmissive Metasurfaces

2019

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Transmissive metasurface-based dual-wide-band dual circular polarized operation is needed to facilitate volume and size reduction along with polarization diversity for future THz wireless communication. In this paper, a novel dual-wide-band THz linear polarization to circular polarization (LP-to-CP) converter is proposed using transmissive metasurfaces. It converts incident X polarized waves into transmitted left-hand circular polarized (LHCP) and right-hand circular polarized (RHCP) waves at two frequency bands. The structure consists of bi-layered metasurfaces having an outer conductor square ring and three inner conductor squares diagonally intersecting each other. The proposed converter works equally well with incident Y polarizations. Operational bandwidths for the dual-band LP-to-CP are 1.16 THz to 1.634 THz (34% fractional bandwidth) and 3.935 THz to 5.29 THz (29% fractional bandwidth). The electromagnetic simulation was carried out in two industry-standard software packages, High Frequency Structure Simulator (HFSS) and Computer Simulation Technology (CST), using frequency and time domain solvers respectively. Close agreement between results depicts the validity and reliability of the proposed design. The idea is supported by equivalent circuits and physical mechanisms involved in the dual-wide-band dual polarization operation. The impact of different geometrical parameters of the unit cell on the performance of LP-to-CP operation is also investigated.

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Multifunction Tunable Piezoelectric‐Actuated Metasurface at Millimeter‐Waves

Vassos

Feresidis

2023

Advanced Photonics Research

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Free space (also termed quasi‐optical) metasurfaces have recently been designed and proposed as new types of polarizers that allow polarization control of an impinging wave in ways that are not possible with conventional designs. However, existing methods for tunable metasurface polarizers are not able to fully control the polarization dynamically; additionally, at mm‐wave and submillimeter bands, they typically suffer from high losses, which are predominantly produced by the inherent limitations of the tuning elements or materials. An electromechanically tunable reﬂection polariser that has the ability to fully control the polarization of an impinging wave has been designed, fabricated, and experimentally tested in a frequency band centered at 57 GHz. The proposed technique utilizes a variable air cavity between a periodic metasurface array and a ground plane, controlled by a piezoelectric actuator. The periodic metasurface element consists of two slightly different cross‐shaped metallic elements arranged in a periodic triangular lattice. Full‐wave simulations are presented and experimentally validated with measurements. The proposed approach is scalable from microwave up to THz frequencies with low‐loss performance due to the nature of the tuning technology whereby the tuning element is not interfering with the electromagnetic waves in the structure.

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Single-Layer Dual-Band Linear-to-Circular Polarization Converter With Wide Axial Ratio Bandwidth and Different Polarization Modes

Cited by 154 publications

References 29 publications

Dual-Band, Orthogonally-Polarized LP-to-CP Converter for SatCom Applications

Dual-Band, Orthogonally-Polarized LP-to-CP Converter for SatCom Applications

Dual-Wide-Band Dual Polarization Terahertz Linear to Circular Polarization Converters based on Bi-Layered Transmissive Metasurfaces

Multifunction Tunable Piezoelectric‐Actuated Metasurface at Millimeter‐Waves

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