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Journal articles on the topic 'Circular polarized'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Shi, Hong-Yu, Wei Li, Shi-Tao Zhu, et al. "Broadband Circular Polarizer Based on Plasmon Hybridizations." International Journal of Antennas and Propagation 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/3859206.

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This paper presents a broadband circular polarizer with a ring/disk cavity structure, which is a broadband application of plasmon hybridizations. The proposed design can convert a linearly polarized wave to a circularly polarized wave from 12.66 GHz to 17.43 GHz within a bandwidth of 30%. The broadband polarization conversion characterization results from the different plasmon hybridization modes induced in the ring/disk cavity. The proposed broadband circular polarizer is demonstrated by both full-wave simulation and measurement.

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2

Fan, Jiao Jiao, Jian Li, Dan Song, Li Wu, and Shu Sheng Peng. "A New Design of Ka-Band Circularly-Polarized Antenna." Applied Mechanics and Materials 631-632 (September 2014): 383–86. http://dx.doi.org/10.4028/www.scientific.net/amm.631-632.383.

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A new ka-band circularly-polarized antenna is presented in this paper, in which a linearly-polarized wave is conversed into a circularly-polarized wave with a circular waveguide polarizer. After simulation and optimization with HFSS (High Frequency Structure Simulator), a compact circularly-polarized antenna is designed with a total height less than 25mm. More simple and easier structure is adopted to achieve a low-profile circularly-polarized antenna.

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3

Mangi, Farman Ali, Shaoqiu Xiao, Ghulam Ali Mallah, Deedar Ali Jamro, Imran Memon, and Ghulam Fatima Kakepoto. "Multiband Circular Polarizer Based on Fission Transmission of Linearly Polarized Wave forX-Band Applications." Journal of Electrical and Computer Engineering 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/4293089.

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A multiband circular polarizer based on fission transmission of linearly polarized wave forx-band application is proposed, which is constructed of 2 × 2 metallic strips array. The linear-to-circular polarization conversion is obtained by decomposing the linearly incidentx-polarized wave into two orthogonal vector components of equal amplitude and 90° phase difference between them. The innovative approach of “fission transmission of linear-to-circular polarized wave” is firstly introduced to obtain giant circular dichroism based on decomposition of orthogonal vector components through the struc

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4

Yavorskiy, Dmitriy, Maria Szoła, Krzysztof Karpierz, et al. "Polarization of Magnetoplasmons in Grating Metamaterials Based on CdTe/CdMgTe Quantum Wells." Materials 13, no. 8 (2020): 1811. http://dx.doi.org/10.3390/ma13081811.

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Grating metamaterials were fabricated with electron beam lithography on CdTe/CdMgTe modulation doped structures with two non-interacting quantum wells. Two types of samples were studied: with etched gratings and with gratings formed by deposition of Au stripes. The polarization properties at THz frequencies of the gratings were determined at room temperature. It was shown that Au gratings formed a linear polarizer, while etched gratings did not polarize THz radiation. Transmission of circularly polarized THz radiation at low temperatures through a sample with no grating showed a strongly circu

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5

Kakepoto, Ghulam Fatima, Shao-Qiu Xiao, and Farman Ali Mangi. "Circularly polarized scanning phased array antenna based on circular polarizer." Journal of Electromagnetic Waves and Applications 34, no. 18 (2020): 2514–26. http://dx.doi.org/10.1080/09205071.2020.1828180.

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6

Partini, Juliasih. "Efek Circular Dichroism pada Metamaterial Chiral Planar." Risalah Fisika 2, no. 2 (2018): 49–52. http://dx.doi.org/10.35895/rf.v2i2.113.

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Abstrak – Penelitian ini mengkaji efek circular dichroism pada metamaterial chiral planar. Bidang polarisasi akan terotasi ketika cahaya yang terpolarisasi linear melewati metamaterial chiral planar. Pada efek circular dichroism, cahaya yang terpolarisasi circular putaran kanan dan putaran kiri akan mempunyai perbedaan absorpsi dalam interaksinya dengan partikel penyusun metamaterial chiral planar. Spektrum eliptisitas metamaterial chiral planar menunjukkan eliptisitas bahan yang bernilai positif untuk sampel putar kanan dan bernilai negatif untuk sampel putar kiri. Nilai eliptisitas diperoleh

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7

Takano, Hideo, and Yuhji Yoshida. "Circular Polarized LCD." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 321, no. 1 (1998): 359–63. http://dx.doi.org/10.1080/10587259808025102.

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8

Joseph, Ronald, and Takeshi Fukusako. "CIRCULARLY POLARIZED BROADBAND ANTENNA WITH CIRCULAR SLOT ON CIRCULAR GROUNDPLANE." Progress In Electromagnetics Research C 26 (2012): 205–17. http://dx.doi.org/10.2528/pierc11110810.

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9

Safin, F. M., V. G. Maslov, A. Y. Dubavik, E. P. Kolesova, A. V. Baranov, and A. V. Fedorov. "Photochemically Induced Circular Dichroism of Semiconductor Nanocrystals-=SUP=-*-=/SUP=-." Журнал технической физики 128, no. 8 (2020): 1192. http://dx.doi.org/10.21883/os.2020.08.49723.1008-20.

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Here, we report an investigation of optical activity which was photochemically induced by illumination of QRs and DiRs with circularly polarized light; the photo-induced circular dichroism was quantitatively estimated, and it was shown that the photo-induced chemical reaction proceeds selectively, depending on the handedness of circularly polarized light. Keywords: chirality, optical activity, circular dichroism, photoinduced circular dichroism, semiconductor nanocrystals, quantum rods, quantum dot-in-rods.

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10

Tam, M. T. K., and R. D. Murch. "Circularly polarized circular sector dielectric resonator antenna." IEEE Transactions on Antennas and Propagation 48, no. 1 (2000): 126–28. http://dx.doi.org/10.1109/8.827396.

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11

Jiang, Yannan, Jing Zhao, and Jiao Wang. "Reconfigurable Polarizer Based on Bulk Dirac Semimetal Metasurface." Crystals 10, no. 3 (2020): 228. http://dx.doi.org/10.3390/cryst10030228.

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In this paper, we propose a reflective polarizer in terahertz regime, which utilizes the Bulk-Dirac-Semimetal (BDS) metasurface can be dynamically tuned in broadband. The proposed polarizer is capable of converting the linear polarized wave into the circular polarized or the cross polarized waves by adjusting the Fermi energy (EF) of the BDS. In the frequency range of 0.51 THz and 1.06 THz, the incident linear polarized wave is converted into a circular polarized wave with an axial ratio (AR) less than 3 dB when EF = 30 meV. When EF = 45 meV, the cross-polarization conversion is achieved with

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12

Zhang, Ranran, Qiuling Zhao, Xia Wang, Wensheng Gao, Jensen Li, and Wing Yim Tam. "Measuring circular phase-dichroism of chiral metasurface." Nanophotonics 8, no. 5 (2019): 909–20. http://dx.doi.org/10.1515/nanoph-2019-0061.

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AbstractThe ability of chiral media to differentiate circularly polarized light is conventionally characterized by circular dichroism (CD) which is based on the difference in the absorption of the incident light for different polarizations. Thus, CD probes the bulk properties of chiral media. Here, we introduce a new approach termed as circular phase-dichroism that is based on the surface properties and is defined as the difference of the reflection phase for different circularly polarized incident lights in characterizing chiral media. As a demonstration, we measure the reflection phase from

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13

Yo, Tzong-Chee, Chien-Ming Lee, Chen-Ming Hsu, and Ching-Hsing Luo. "Compact Circularly Polarized Rectenna With Unbalanced Circular Slots." IEEE Transactions on Antennas and Propagation 56, no. 3 (2008): 882–86. http://dx.doi.org/10.1109/tap.2008.916956.

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14

Rza̧żewski, Kazimierz, and Bernard Piraux. "Circular Rydberg orbits in circularly polarized microwave radiation." Physical Review A 47, no. 3 (1993): R1612—R1615. http://dx.doi.org/10.1103/physreva.47.r1612.

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15

Kumar, Sachin, Abhishek Sharma, Binod K. Kanaujia, Mukesh K. Khandelwal, and Anil Kumar Gautam. "Dual-band stacked circularly polarized microstrip antenna for S and C band applications." International Journal of Microwave and Wireless Technologies 8, no. 8 (2015): 1215–22. http://dx.doi.org/10.1017/s1759078715000732.

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A single-fed circularly polarized microstrip antenna is proposed where the antenna structure exhibits truncated corners in the radiating square patch. The truncated corners square patch structure is loaded with a circular slot and is resonating at 2.25 GHz with circular polarization. Furthermore, the proposed antenna is stacked using an upper circular patch thus achieving a dual-band circularly polarized pattern. The dual-band antenna resonates at 2.25 GHz in the first band and with impedance bandwidth ranging from 4.4 to 5.5 GHz in the second band. The size of the proposed stacked structure i

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16

Chiou, Tsyr-Huei, and Ching-Wen Wang. "Neural processing of linearly and circularly polarized light signal in a mantis shrimp Haptosquilla pulchella." Journal of Experimental Biology 223, no. 22 (2020): jeb219832. http://dx.doi.org/10.1242/jeb.219832.

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ABSTRACTStomatopods, or mantis shrimp, are the only animal group known to possess circular polarization vision along with linear polarization vision. By using the rhabdomere of a distally located photoreceptor as a wave retarder, the eyes of mantis shrimp are able to convert circularly polarized light into linearly polarized light. As a result, their circular polarization vision is based on the linearly polarized light-sensitive photoreceptors commonly found in many arthropods. To investigate how linearly and circularly polarized light signals might be processed, we presented a dynamic polariz

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17

Fan, Tingting, Patrik Grychtol, Ronny Knut, et al. "Bright circularly polarized soft X-ray high harmonics for X-ray magnetic circular dichroism." Proceedings of the National Academy of Sciences 112, no. 46 (2015): 14206–11. http://dx.doi.org/10.1073/pnas.1519666112.

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We demonstrate, to our knowledge, the first bright circularly polarized high-harmonic beams in the soft X-ray region of the electromagnetic spectrum, and use them to implement X-ray magnetic circular dichroism measurements in a tabletop-scale setup. Using counterrotating circularly polarized laser fields at 1.3 and 0.79 µm, we generate circularly polarized harmonics with photon energies exceeding 160 eV. The harmonic spectra emerge as a sequence of closely spaced pairs of left and right circularly polarized peaks, with energies determined by conservation of energy and spin angular momentum. We

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18

Chang, Ki-Hun, Ji-Hwan Ahn, and Young-Joong Yoon. "Artificial Magnetic Conductor(AMC) Polarizer Backed Circular-Polarized(CP) Antenna." Journal of Korean Institute of Electromagnetic Engineering and Science 21, no. 5 (2010): 459–67. http://dx.doi.org/10.5515/kjkiees.2010.21.5.459.

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19

Squadrito, Paolo, Patrizia Livreri, Loreto Di Donato, Concetto Squadrito, and Gino Sorbello. "A Telemetry, Tracking, and Command Antennas System for Small-Satellite Applications." Electronics 8, no. 6 (2019): 689. http://dx.doi.org/10.3390/electronics8060689.

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Circularly polarized (CP) antennas are used in space applications for telemetry tracking and command (TT&C). In this paper, we present an antenna for a TT&C system that can employ only four antennas to achieve a wide quasi-isotropic coverage. The proposed single-feed circular polarized annular patch antenna is low profile and compact. It exhibits a wide impedance bandwidth of 19.7%, wide-angle circular polarization with an on-axis maximum gain higher than 6 dBi and an axial ratio below 4 dB in the frequency band 2.0–2.3 GHz. The developed low-cost antenna can be used for small-satellit

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20

Kumar, Jatish, Tsuyoshi Kawai, and Takuya Nakashima. "Circularly polarized luminescence in chiral silver nanoclusters." Chemical Communications 53, no. 7 (2017): 1269–72. http://dx.doi.org/10.1039/c6cc09476g.

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Sets of mirror image circular dichroism (CD) and circularly polarized luminescence (CPL) spectra are for the first time demonstrated using enantiomeric dihydrolipoic acid (DHLA)-capped silver nanoclusters.

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21

Hu, Yan‐wen, Yu Wang, Zhong‐ming Yan, and Hong‐cheng Zhou. "A high‐gain circularly polarized Fabry‐Perot antenna with chiral metamaterial‐based circular polarizer." Microwave and Optical Technology Letters 62, no. 2 (2019): 906–11. http://dx.doi.org/10.1002/mop.32102.

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22

Hareli, Liran, Gavriel Lerner, Oren Cohen, and Alon Bahabad. "Circularly polarized high harmonic generation through virtual circular birefringence." Applied Physics Letters 118, no. 22 (2021): 221106. http://dx.doi.org/10.1063/5.0053660.

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23

Klemke, Nicolai, Nicolas Tancogne-Dejean, Giulio M. Rossi, et al. "Polarization states of high-harmonics generated in silicon from elliptical drivers." EPJ Web of Conferences 205 (2019): 02022. http://dx.doi.org/10.1051/epjconf/201920502022.

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The polarization states of high-harmonics generated in silicon with elliptical excitation are studies. Circularly polarized harmonics are demonstrated with both circular and non-circular excitation, determined by crystal symmetry and the dynamical response of the system.

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24

Dhbaibi, Kais, Ludovic Favereau, Monika Srebro-Hooper, et al. "Exciton coupling in diketopyrrolopyrrole–helicene derivatives leads to red and near-infrared circularly polarized luminescence." Chemical Science 9, no. 3 (2018): 735–42. http://dx.doi.org/10.1039/c7sc04312k.

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25

Ramin Moayed, Mohammad Mehdi, Fu Li, Philip Beck, Jan-Christian Schober, and Christian Klinke. "Anisotropic circular photogalvanic effect in colloidal tin sulfide nanosheets." Nanoscale 12, no. 11 (2020): 6256–62. http://dx.doi.org/10.1039/d0nr01189d.

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The electronic response of colloidal 2D tin sulfide crystals to the illumination with circularly polarized light has been investigated. The nanocrystals show a strong anisotropic circular photogalvanic effect.

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26

Zainud-Deen, S., S. Abd Elhamied, and H. Abd El-Azem Malhat. "Integrated Millimeter-Wave Antennas for On-Chip Communication." Advanced Electromagnetics 5, no. 1 (2016): 22. http://dx.doi.org/10.7716/aem.v5i1.333.

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This paper introduces the design and analysis of circularly polarized (CP) and dual-polarized on-chip microstrip antennas for wireless communication at 60 GHz. The CP on-chip antenna consists of a circular aluminum patch with two overlapped circular slots fed by the transmission line. The radiation characteristics of the CP have been analyzed using the finite integration technique and finite element method based electromagnetic solvers. The CP antenna introduces left-hand circular polarization and employs as on-chip transmitter. A design of dual-polarized on-chip microstrip antenna at 60 GHz i

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27

Liang, Kaichang, Lichao Dong, Na Jin, et al. "The synthesis of chiral triphenylpyrrole derivatives and their aggregation-induced emission enhancement, aggregation-induced circular dichroism and helical self-assembly." RSC Advances 6, no. 28 (2016): 23420–27. http://dx.doi.org/10.1039/c5ra26985g.

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28

Li, Hongkun, Juan Cheng, Yihua Zhao, et al. "l-Valine methyl ester-containing tetraphenylethene: aggregation-induced emission, aggregation-induced circular dichroism, circularly polarized luminescence, and helical self-assembly." Mater. Horiz. 1, no. 5 (2014): 518–21. http://dx.doi.org/10.1039/c4mh00078a.

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29

Zhao, Na, Wangwang Gao, Min Zhang, et al. "Regulation of circular dichroism behavior and construction of tunable solid-state circularly polarized luminescence based on BINOL derivatives." Materials Chemistry Frontiers 3, no. 8 (2019): 1613–18. http://dx.doi.org/10.1039/c9qm00292h.

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30

Ishii, A., and T. Miyasaka. "Direct detection of circular polarized light in helical 1D perovskite-based photodiode." Science Advances 6, no. 46 (2020): eabd3274. http://dx.doi.org/10.1126/sciadv.abd3274.

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Detection of circularly polarized light (CPL) has a high potential for development of various optical technologies. Conventional photodetectors require optical polarizers on the device to detect polarized light, and this causes substantial losses of sensitivity and resolution in light detection. Here, we report direct CPL detection by a photodiode using a helical one-dimensional (1D) structure of lead halide perovskites composed of naphthylethylamine-based chiral organic cations. The 1D structure with face-sharing (PbI6)4− octahedral chains whose helicity is largely affected by chiral cations

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31

Gon, Masayuki, Yasuhiro Morisaki, and Yoshiki Chujo. "A silver(i)-induced higher-ordered structure based on planar chiral tetrasubstituted [2.2]paracyclophane." Chemical Communications 53, no. 59 (2017): 8304–7. http://dx.doi.org/10.1039/c7cc03615a.

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32

Amako, Tomoyuki, Kazuki Nakabayashi, Tadashi Mori, Yoshihisa Inoue, Michiya Fujiki, and Yoshitane Imai. "Sign inversion of circularly polarized luminescence by geometry manipulation of four naphthalene units introduced into a tartaric acid scaffold." Chem. Commun. 50, no. 85 (2014): 12836–39. http://dx.doi.org/10.1039/c4cc04228j.

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33

Peregrine-Smew, Anabel, David Farrelly, and T. Uzer. "Comment on ‘‘Circular Rydberg orbits in circularly polarized microwave radiation’’." Physical Review A 51, no. 5 (1995): 4293–94. http://dx.doi.org/10.1103/physreva.51.4293.

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34

Mcpherson, Tyler J., Zabed Iqbal, and Sungkyun Lim. "A Wideband, Circularly Polarized, Directive Antenna With a Circular Reflector." IEEE Access 7 (2019): 177703–12. http://dx.doi.org/10.1109/access.2019.2958528.

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35

Horinaka, Hiromichi, Hiroshi Inada, and Takashi Saijyo. "Luminescence Circular Polarization of AgGaSe2on Excitation of Circularly Polarized Light." Japanese Journal of Applied Physics 28, Part 1, No. 8 (1989): 1332–36. http://dx.doi.org/10.1143/jjap.28.1332.

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36

Tan, Yan Bing, Yoshinori Okayasu, Shohei Katao, et al. "Visible Circularly Polarized Luminescence of Octanuclear Circular Eu(III) Helicate." Journal of the American Chemical Society 142, no. 41 (2020): 17653–61. http://dx.doi.org/10.1021/jacs.0c08229.

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37

Sanchez-Castillo, A., S. Eslami, F. Giesselmann, and P. Fischer. "Circular polarization interferometry: circularly polarized modes of cholesteric liquid crystals." Optics Express 22, no. 25 (2014): 31227. http://dx.doi.org/10.1364/oe.22.031227.

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38

Qi, S. Shan, Wen Wu, and D. Gang Fang. "Singly-Fed Circularly Polarized Circular Aperture Antenna With Conical Beam." IEEE Transactions on Antennas and Propagation 61, no. 6 (2013): 3345–49. http://dx.doi.org/10.1109/tap.2013.2253302.

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39

Cheng, C. H., C. Y. Lee, and T. F. Gallagher. "Production of Circular Rydberg States with Circularly Polarized Microwave Fields." Physical Review Letters 73, no. 23 (1994): 3078–81. http://dx.doi.org/10.1103/physrevlett.73.3078.

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40

Rahman, Muhammad Asad, Quazi Delwar Hossain, Md Azad Hossain, Eisuke Nishiyama, and Ichihiko Toyoda. "Design and parametric analysis of a planar array antenna for circular polarization." International Journal of Microwave and Wireless Technologies 8, no. 6 (2015): 921–29. http://dx.doi.org/10.1017/s1759078715000264.

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A new circularly polarized planar array antenna using linearly polarized microstrip patches is designed and optimized for X-band wireless communication applications. Four square patch elements with feed network are used to design the circularly polarized array antenna. The feed network consists of microstrip lines on the obverse side of the dielectric substrate and slot line on the reverse side of the substrate. Both-sided MIC technology is successfully employed to apply its inherent advantages in the design process of the array structure. The unequal feed line is used to create 90° phase diff

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41

Pongratz, S. "Circular polarized electron cyclotron resonance source." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 9, no. 6 (1991): 3493. http://dx.doi.org/10.1116/1.585830.

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42

Wang, Jijun, Jing Cao, Min Zhu, Zhipan Zhu, and Yun-tuan Fang. "Split and Merge of Left–Right Circular Polarized Light through Coupled Magnetic Resonators." Zeitschrift für Naturforschung A 67, no. 8-9 (2012): 491–97. http://dx.doi.org/10.5560/zna.2012-0051.

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In order to obtain the means to control light polarization, we designed a structure of coupled magnetic resonators and studied its transmission properties by the 4x4 transfer matrix method. The incidence of linearly polarized light results in two transmission resonant peaks of left-handed circular polarization at shorter wavelengths and two transmission resonant peaks of right-handed circular polarization at longer wavelengths, respectively. Through adjusting the magnetizations, the inner left-handed circular polarization and right-handed circular polarization can be merged into one linear pol

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43

Harada, Tomoyuki, Hiroshi Yanagita, Naoya Ryu, et al. "Lanthanide ion-doped silica nanohelix: a helical inorganic network acts as a chiral source for metal ions." Chemical Communications 57, no. 36 (2021): 4392–95. http://dx.doi.org/10.1039/d1cc01112j.

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Chiroptical properties (circular dichroism and circularly polarized luminescence) were induced in lanthanide ions by doping in silica nanohelices with a chirally arranged siloxane network without any organic mediates.

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44

Yadav, R. K., Mritunjay Rai, and Manoj Kumar Vishwakarma. "Microstrip Patch Antenna with Circular Polarization Loaded with Drumsticks Slots." International Journal of Sensors, Wireless Communications and Control 9, no. 2 (2019): 260–68. http://dx.doi.org/10.2174/2210327908666180628162129.

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Background & Objective: In this paper circularly polarized microstrip planar antenna is proposed in the 5-6 GHz frequency range. With the introduction of Drum sticks slot and a coaxial feed the antenna exhibits excellent Return loss and Axial Ratio characteristics during simulation. Further, a wider AR bandwidth is achieved in the antenna 3 with the introduction of central circular slots. The circularly polarized antenna is fabricated using Arlon AD 250 substrate and this paper presents its design and simulation using optimization engine HFSS. Conclusion: The substrate has a relative permi

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45

Martinez-de-Rioja, Eduardo, Daniel Martinez-de-Rioja, Rafael López-Sáez, Ignacio Linares, and Jose A. Encinar. "High-Efficiency Polarizer Reflectarray Antennas for Data Transmission Links from a CubeSat." Electronics 10, no. 15 (2021): 1802. http://dx.doi.org/10.3390/electronics10151802.

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This paper presents two designs of high-efficiency polarizer reflectarray antennas able to generate a collimated beam in dual-circular polarization using a linearly polarized feed, with application to high-gain antennas for data transmission links from a Cubesat. First, an 18 cm × 18 cm polarizer reflectarray operating in the 17.2–22.7 GHz band has been designed, fabricated, and tested. The measurements of the prototype show an aperture efficiency of 52.7% for right-handed circular polarization (RHCP) and 57.3% for left-handed circular polarization (LHCP), both values higher than those previou

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46

Chung, S. C., Y. F. Song, P. C. Tseng, C. C. Chen, C. T. Chen, and K. L. Tsang. "A high-performance wide-range beamline for elliptically polarized undulator source." Journal of Synchrotron Radiation 5, no. 3 (1998): 551–53. http://dx.doi.org/10.1107/s0909049597015409.

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A high-performance wide-range beamline has been designed for monochromatizing circularly polarized photons with energies from 10 to 1400 eV. A grazing SGM-based beamline with two entrance slits has been employed to optimize the performance. The degree of the circular polarization affected by the beamline optics has been analysed. The horizontal and vertical refocusing mirrors have been specially arranged to improve greatly the polarization degree in the low-energy region. By connecting this beamline to a high-efficiency elliptically polarized undulator, this beamline should be able to provide,

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47

Zhao, Shuang, and Dian Ren Chen. "Research on the Circular Polarization Microstrip Array Antenna." Applied Mechanics and Materials 662 (October 2014): 243–46. http://dx.doi.org/10.4028/www.scientific.net/amm.662.243.

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A single array element circularly polarized microstrip patch antenna is analyzed based on the theory of cavity mode. Through studying the design of circularly polarized microstrip antenna array, a 96 elements circularly polarized microstrip antenna array is designed and it is optimized by using the Ansoft's HFSS software. After testing of the antenna, we can see that it provides a gain of 22.6dB and has a good axial ratio.

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48

Aqlan, Basem, Mohamed Himdi, Hamsakutty Vettikalladi, and Laurent Le-Coq. "Experimental Realization of Sub-THz Circularly Polarized Antenna Based on Metasurface Superstrate at 300 GHz." Materials 14, no. 17 (2021): 4796. http://dx.doi.org/10.3390/ma14174796.

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This communication presents a low-profile fully metallic high gain circularly polarized resonant cavity antenna, with a novel single-layer metasurface as superstrate operating at 300 GHz. The unit cell of the metallic metasurface layer consists of perforated grids of hexagonal and octagonal-shaped radiating apertures. The metasurface superstrate layer acts as a polarization convertor from linear-to-circular, which provides left-handed circularly polarized (LHCP) radiation. For simplicity and less design difficulty, a low cost laser cutting brass technology is proposed to design the antenna at

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Hajlaoui, El Amjed, and Ziyad Almohaimeed. "Analysis and Development of an Efficient Cross-Slot Loaded Compact Electromagnetic Band Gap Antenna." Applied Computational Electromagnetics Society 36, no. 6 (2021): 734–39. http://dx.doi.org/10.47037/2020.aces.j.360615.

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Abstract:

This paper is devoted to a novel Electromagnetic Band Gap (EBG) single-feed circularly polarized microstrip EBG antenna with compact size proposed for C-Band applications. The antenna structure will include eight slits introduced at the boundary and the corners in the radiating square patch with a cross-slot at the center. The provided study will effectively approve the various proposed structures and interest occupied by these types of antennas in the enhancement of output parameters (gain, directivity, radiation efficiency, and bandwidth) without much affecting the operating bandwidth at C-b

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Stevenson, Warren D., Xiangbing Zeng, Chris Welch, Anil K. Thakur, Goran Ungar, and Georg H. Mehl. "Macroscopic chirality of twist-bend nematic phase in bent dimers confirmed by circular dichroism." Journal of Materials Chemistry C 8, no. 3 (2020): 1041–47. http://dx.doi.org/10.1039/c9tc05061b.

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Abstract:

Long-range global chirality is confirmed in the twist-bend nematic phase of bent dimers using circular dichroism spectroscopy. The phase absorbs left and right circularly polarized light differently, confirming its helical rather than wavy character.

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