Metasurfaces for broadband terahertz linear polarization rotation and linear-to-circular polarization conversion

2018 ◽  
Author(s):  
Hou-Tong Chen
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Polarization Conversion ◽  
Polarization Rotation ◽  
Broadband Terahertz

scholarly journals A Multi Polarization Square Patch Antenna with a Reconfigurable Feeding Network

2021 ◽  
Author(s):  
Roozbeh Rezaeipour
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Signal Strength ◽  
Reconfigurable Antenna ◽  
Polarization Rotation ◽  
Power Dividers ◽  
Switching Circuits ◽  
Specific Frequency ◽  
The One

<p>Rotation of polarization is the one of problem in communication with linear polarization. In fact, it can reduce the received signal strength down to -20 dB in some cases. Circular polarization is one the accessible approaches for sorting this problem due to it can be immune against polarization rotation. In this paper, proposed antenna can perform in linear and circular polarization which can be switched according to the condition of signal which is being transmitted. Consequently, environmental disruptions could not decline the quality of communication. 1) The proposed antenna is categorized in reconfigurable antennas which have different methods for implementation. First of all, the proposed antenna is a multi-polarization reconfigurable antenna that can radiate circular polarization and linear polarization on the same structure at a specific frequency. Moreover, a simple feeding network for this antenna is implemented. This antenna utilizes common power dividers for feeding the square patch. Finally, switching circuits which are used for changing polarization in this antenna are by far simple than that of existing works.</p>

scholarly journals A Multi Polarization Square Patch Antenna with a Reconfigurable Feeding Network

2021 ◽  
Author(s):  
Roozbeh Rezaeipour
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Signal Strength ◽  
Reconfigurable Antenna ◽  
Polarization Rotation ◽  
Power Dividers ◽  
Switching Circuits ◽  
Specific Frequency ◽  
The One

<p>Rotation of polarization is the one of problem in communication with linear polarization. In fact, it can reduce the received signal strength down to -20 dB in some cases. Circular polarization is one the accessible approaches for sorting this problem due to it can be immune against polarization rotation. In this paper, proposed antenna can perform in linear and circular polarization which can be switched according to the condition of signal which is being transmitted. Consequently, environmental disruptions could not decline the quality of communication. 1) The proposed antenna is categorized in reconfigurable antennas which have different methods for implementation. First of all, the proposed antenna is a multi-polarization reconfigurable antenna that can radiate circular polarization and linear polarization on the same structure at a specific frequency. Moreover, a simple feeding network for this antenna is implemented. This antenna utilizes common power dividers for feeding the square patch. Finally, switching circuits which are used for changing polarization in this antenna are by far simple than that of existing works.</p>

scholarly journals Simple design of efficient broadband multifunctional polarization converter for X-band applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thi Kim Thu Nguyen ◽  
Thi Minh Nguyen ◽  
Hong Quang Nguyen ◽  
Thanh Nghia Cao ◽  
Dac Tuyen Le ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Incident Angle ◽  
Polarization Conversion ◽  
Simple Design ◽  
Cross Polarization ◽  
Polarization Converter ◽  
Frequency Bands ◽  
X Band ◽  
Cost Efficient ◽  
Patch Resonators

AbstractA simple design of a broadband multifunctional polarization converter using an anisotropic metasurface for X-band application is proposed. The proposed polarization converter consists of a periodic array of the two-corner-cut square patch resonators based on the FR-4 substrate that achieves both cross-polarization and linear-to-circular polarization conversions. The simulated results show that the polarization converter displays the linear cross-polarization conversion in the frequency range from 8 to 12 GHz with the polarization conversion efficiency above 90%. The efficiency is kept higher than 80% with wide incident angle up to 45°. Moreover, the proposed design achieves the linear-to-circular polarization conversion at two frequency bands of 7.42–7.6 GHz and 13–13.56 GHz. A prototype of the proposed polarization converter is fabricated and measured, showing a good agreement between the measured and simulated results. The proposed polarization converter exhibits excellent performances such as simple structure, multifunctional property, and large cost-efficient bandwidth and wide incident angle insensitivity in the linear cross polarization conversion, which can be useful for X-band applications. Furthermore, this structure can be extended to design broadband polarization converters in other frequency bands.

scholarly journals Broadband Linear Polarization in Ap Stars

1993 ◽  
Vol 138 ◽  
pp. 305-309
Author(s):  
Marco Landolfi ◽  
Egidio Landi Degl’Innocenti ◽  
Maurizio Landi Degl’Innocenti ◽  
Jean-Louis Leroy ◽  
Stefano Bagnulo
Keyword(s):  
Magnetic Field ◽  
Circular Polarization ◽  
Linear Polarization ◽  
Rotation Axis ◽  
Spectral Lines ◽  
Line Of Sight ◽  
Long Time ◽  
Rotating Star ◽  
Ap Stars ◽  
The Magnetic Field

AbstractBroadband linear polarization in the spectra of Ap stars is believed to be due to differential saturation between σ and π Zeeman components in spectral lines. This mechanism has been known for a long time to be the main agent of a similar phenomenon observed in sunspots. Since this phenomenon has been carefully calibrated in the solar case, it can be confidently used to deduce the magnetic field of Ap stars.Given the magnetic configuration of a rotating star, it is possible to deduce the broadband polarization at any phase. Calculations performed for the oblique dipole model show that the resulting polarization diagrams are very sensitive to the values of i (the angle between the rotation axis and the line of sight) and β (the angle between the rotation and magnetic axes). The dependence on i and β is such that the four-fold ambiguity typical of the circular polarization observations ((i,β), (β,i), (π-i,π-β), (π-β,π-i)) can be removed.

Broadband linear polarization conversion based on the coupling of bilayer metamaterials in the terahertz region

2017 ◽  
Vol 383 ◽  
pp. 310-315 ◽  
Author(s):  
Rui Xia ◽  
Xufeng Jing ◽  
Huihui Zhu ◽  
Weimin Wang ◽  
Ying Tian ◽  
...  
Keyword(s):  
Linear Polarization ◽  
Polarization Conversion ◽  
Terahertz Region

Compact e-shape metasurface with dual-band circular polarization conversion

2016 ◽  
Vol 381 ◽  
pp. 48-55 ◽  
Author(s):  
Hailin Cao ◽  
Xiaodong Wu ◽  
Zhoujian Chen ◽  
Chengzhuo Zhu ◽  
Xiaoheng Tan ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Dual Band ◽  
Polarization Conversion
Sign in / Sign up

Export Citation Format

Share Document