A Wideband Non-Uniform Metasurface-Based Circularly Polarized Reconfigurable Antenna

Abstract This paper reports a novel polarization-reconfigurable antenna array based on the theory of mode combination (MC), which can electronically alter its polarization states between left-hand circular polarization (LCP) mode, right-hand circular polarization (RCP) mode, and two combined linear polarization (LP) modes. The array element is adopted as the L-probes fed circularly-polarized antenna reported by Luk et al. [1]. To verify the concept, a prototype of 2×2 antenna array is manufactured and tested. By properly exciting the feeding probes, four polarization modes can be switchable. Measurement results show that the proposed antenna has an overlapped −10 dB impedance bandwidth around 34 % for both CP modes and LP(2) mode, and an overlapped 3 dB axial-ratio bandwidth around 22.0 % of the CP modes. The average realized gains are around 12.4 dB for CP modes and LP(1) mode, which remain stable in the axial-ratio bandwidth.

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Metasurface based Circularly Polarized Reconfigurable Antenna

Indian Journal of Science and Technology ◽

10.17485/ijst/2016/v9i44/101959 ◽

2016 ◽

Vol 9 (44) ◽

Author(s):

S. Revathi ◽

E. Sivakumar ◽

B. Ramachandran

Keyword(s):

Reconfigurable Antenna ◽

Circularly Polarized

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Circularly polarized reconfigurable microstrip loop antenna using parasitic patches and PIN diodes

Frequenz ◽

10.1515/freq-2019-0160 ◽

2020 ◽

Vol 74 (7-8) ◽

pp. 255-262

Author(s):

Supakit Kawdungta ◽

Chuwong Phongcharoenpanich

Keyword(s):

Wireless Communication ◽

Circular Polarization ◽

Axial Ratio ◽

Loop Antenna ◽

Main Beam ◽

Impedance Bandwidth ◽

Reconfigurable Antenna ◽

Communication Performance ◽

Pin Diodes ◽

Circularly Polarized

AbstractThis research proposes a novel circularly polarized (CP) reconfigurable microstrip loop antenna for 2.4–2.5 GHz advanced wireless communication using two parasitic patches and two PIN diodes. The reconfigurable antenna can alternate between right hand circular polarization (RHCP) and left hand circular polarization (LHCP) at the main beam by manipulating the ON/OFF status of the PIN diodes. Simulations were carried out for the optimal antenna parameters, and an antenna prototype was fabricated and experiments were undertaken. The simulation and measured results are in good agreement. The antenna achieves an impedance bandwidth of 2.4–2.5 GHz and unidirectional radiation pattern with a maximum gain of 5 dBic and 3-dB axial ratio for both RHCP and LHCP. As a result, the proposed reconfigurable antenna could be utilized to improve wireless communication performance. In essence, the novelty of this research lies in the utilization of parasitic patches and shorted PIN diodes to transform linear to circular polarization; and the reconfigurability of polarization between RHCP and LHCP.

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A Circularly-Polarized Frequency-Reconfigurable Antenna with Self-Complementary Metasurface

2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) ◽

10.1109/nemo49486.2020.9343510 ◽

2020 ◽

Author(s):

Ge Zhao ◽

Mei Song Tong

Keyword(s):

Reconfigurable Antenna ◽

Circularly Polarized ◽

Frequency Reconfigurable Antenna

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Differential polarization imaging of sickled cells

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100102390 ◽

1988 ◽

Vol 46 ◽

pp. 62-63

Author(s):

Marcos F. Maestre

Keyword(s):

Optical Properties ◽

Theoretical Approach ◽

Polarized Light ◽

Polarization Microscopy ◽

Spectroscopic Techniques ◽

Polarization Imaging ◽

Circularly Polarized Light ◽

Circularly Polarized ◽

Microscopic Scale ◽

Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

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