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Journal articles on the topic 'Log spiral antenna'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Alhomrani, Abdulrahman, Ali Yahyaoui, Anas Al Hashmi, et al. "Parametric Analysis of an Optical Log-Spiral Nano-Antenna for Infrared Energy Harvesting." Applied Computational Electromagnetics Society 35, no. 10 (2020): 1183–91. http://dx.doi.org/10.47037/2020.aces.j.351011.

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In this paper, we present the design of a spiral nano-antenna dedicated to infrared energy harvesting at 28.3 THz. A comprehensive, detailed parametric study of key parameters such as the initial angle at the origin arm, width of the spiral arms, gap between the two arms, thickness of substrate, length of substrate, thickness of patch and number of turns of the nano-antenna is also presented and discussed in order to harvest maximum electric field in the gap of the spiral antenna in the frequency range of 28 – 29 THz. The maximum electric field is simulated at 28.1, 28.3, 28.5 and 28.7 THz. A variation of the electric field of the antenna for different value of incident wave angle at the resonance frequency 28.3 THz has been simulated. The main advantages of the studied structure are its ability to reach high confined electric field within its gap, its wideband behavior around the operating frequency 28.3 THz, and its insensitivity to polarization of incident electromagnetic waves.

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2

Yahyaoui, Ali, Ahmed Elsharabasy, Jawad Yousaf, and Hatem Rmili. "Numerical Analysis of MIM-Based Log-Spiral Rectennas for Efficient Infrared Energy Harvesting." Sensors 20, no. 24 (2020): 7023. http://dx.doi.org/10.3390/s20247023.

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This work presents the design and analysis of a metal-insulator-metal (MIM)-based optical log spiral rectenna for efficient energy harvesting at 28.3 THz. To maximize the benefits of the enhanced field of the proposed nano-antenna in the rectification process, the proposed design considers the antenna arms (Au) as the electrodes of the rectifying diode and the insulator is placed between the electrode terminals for the compact design of the horizontal MIM rectenna. The rectifier insulator, Al2O3, was inserted at the hotspot located in the gap between the antennas. A detailed analysis of the effect of different symmetric and asymmetric MIM-configurations (Au-Al2O3-Ag, Au-Al2O3-Al, Au-Al2O3-Cr, Au-Al2O3-Cu, and Au-Al2O3-Ti) was conducted. The results of the study suggested that the asymmetric configuration of Au-Al2O3-Ag provides optimal results. The proposed design benefits from the captured E-field intensity, I-V, resistivity, and responsivity and results in a rectenna that performs efficiently.

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3

Kang, Ho Jae, Jung Ju Bang, Chang Su Huh, and Uk Youl Huh. "Alternative Antenna Research to Optimize MIL-STD-188-125-1 Standard Shielding Effectiveness Measurement." Applied Mechanics and Materials 548-549 (April 2014): 1347–50. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1347.

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Currently, When Shielding effectiveness(SE) test was conducted in MIL-STD-188-125-1, The experiments are using Loop antenna, Log Periodic(LP) antenna, Biconical antenna about shielding in the frequency range of 10k∼1GHz. But, Their size in the shielding effectiveness test influences chamber construction costs. And these influences play a role in increased production costs. So spiral antenna to clear antenna size problem was proposed. This antenna has small size and function to cover broad frequency compared to other antennas. To evaluate antenna performance, we use commercial software simulation program. And we observe radiation characteristic changing arm width and distance between arm. First, through magnitude analysis of S-parameter, antenna characteristic according to each arm distance is analyzed. Secondly, through Theta/Degree Vs. dB function and 2D/3D model, radiation pattern of antenna is investigated. Third, radiation energy magnitude and characteristic of antenna is investigated in simulation program.

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4

Amin, Y., Q. Chen, L. R. Zheng, and H. Tenhunen. "“Green” wideband log-spiral antenna for RFID sensing and wireless applications." Journal of Electromagnetic Waves and Applications 26, no. 14-15 (2012): 2043–50. http://dx.doi.org/10.1080/09205071.2012.724767.

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5

Ernest, Anthony J., Youssef Tawk, Joseph Costantine, and Christos G. Christodoulou. "A Bottom Fed Deployable Conical Log Spiral Antenna Design for CubeSat." IEEE Transactions on Antennas and Propagation 63, no. 1 (2015): 41–47. http://dx.doi.org/10.1109/tap.2014.2367539.

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6

Pradeep Kumar, K. A., Rajagopalan Thiruvengadathan, and G. A. Shanmugha Sundaram. "A log-periodic spiral antenna array for L-band radio interferometric imaging." Journal of Intelligent & Fuzzy Systems 38, no. 5 (2020): 6607–18. http://dx.doi.org/10.3233/jifs-179740.

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7

Mukminin, Moch Khafid, and Nurhayati Nurhayati. "LITERATURE STUDY OF HARVESTING ENERGY WITH RESOURCES RADIO FREQUENCY." INAJEEE Indonesian Journal of Electrical and Eletronics Engineering 3, no. 2 (2020): 48. http://dx.doi.org/10.26740/inajeee.v3n2.p48-55.

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Energy harvesting is the process of harvesting energy from external sources such as solar energy, heat, wind and electromagnetic waves / radio frequencies. dimension. Research on harvesting energy needs to be developed because the use of non-renewable energy is increasingly limited. The use of radio frequency (RF) as a source of energy for harvesting is an effort to create environmentally friendly energy. This is due to the growing use of telecommunications technology. Various studies have been conducted by harvesting RF from various telecommunication signals and broadcasting media (AM / FM, TV / DTV, GSM signals, Wi-Fi signals). The purpose of writing this article is to study literature on the use of harvesting energy, especially those originating from radio / RF frequencies. A simple harvesting energy harvesting system consists of an antenna and a voltage rectifier circuit. The antennas used for RF energy harvesting have different designs according to the type of signal captured, including using periodic log antennas, archimedean spiral antennas, patch antennas, dipole patch antennas and vivaldi antennas. The energy yield obtained from the energy harvesting process with radio frequency sources tends to be small in the milliwatt scale (1.17 µW / cm2 - 20VDC) depending on the type of antenna and radio frequency used (0.3 - 27.5 GHz) and can be applied to low power electronic devices.

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8

Jahangiri, Payam, Ramezan Ali Sadeghzadeh, and Ali Pourziad. "Log spiral antenna with CPW feed line for UWB application and circular polarization." Microwave and Optical Technology Letters 58, no. 1 (2015): 17–21. http://dx.doi.org/10.1002/mop.29486.

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9

Peng, Fei, and Zong Hong Xie. "The Study about the Effect of Geometric Parameters' and Material Properties’ Changing on the Electromagnetic Performance of BSSAS." Applied Mechanics and Materials 459 (October 2013): 76–81. http://dx.doi.org/10.4028/www.scientific.net/amm.459.76.

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This paper introduced a research work on the development of a Broadband Smart Skin Antenna Structure (BSSAS). This structure possessed the load-bearing, shape maintaining and communication capabilities at the same time. A frequency-independent planar log-spiral antenna suitable for electromagnetic communication from 0.8GHz to 8GHz was embedded in a composites sandwich panel. Numerical models have been generated to analyze the effect of geometric parameters and material properties changing on the electromagnetic performance of BSSAS. The numerical results showed that both VSWR and the maximum gain of BSSAS at 1.2GHz and 1.6GHz were not sensitive to the geometric parameters and material properties of the packaging structure.

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10

Anstey, Dominic, Eloy de Lera Acedo, and Will Handley. "A general Bayesian framework for foreground modelling and chromaticity correction for global 21 cm experiments." Monthly Notices of the Royal Astronomical Society 506, no. 2 (2021): 2041–58. http://dx.doi.org/10.1093/mnras/stab1765.

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ABSTRACT The H i 21 cm absorption line is masked by bright foregrounds and systematic distortions that arise due to the chromaticity of the antenna used to make the observation coupling to the spectral inhomogeneity of these foregrounds. We demonstrate that these distortions are sufficient to conceal the 21 cm signal when the antenna is not perfectly achromatic and that simple corrections assuming a constant spatial distribution of foreground power are insufficient to overcome them. We then propose a new physics-motivated method of modelling the foregrounds of 21 cm experiments in order to fit the chromatic distortions as part of the foregrounds. This is done by generating a simulated sky model across the observing band by dividing the sky into N regions and scaling a base map assuming a distinct uniform spectral index in each region. The resulting sky map can then be convolved with a model of the antenna beam to give a model of foregrounds and chromaticity parametrized by the spectral indices of the N regions. We demonstrate that fitting this model for varying N using a Bayesian nested sampling algorithm and comparing the results using the evidence allows the 21 cm signal to be reliably detected in data of a relatively smooth conical log spiral antenna. We also test a much more chromatic conical sinuous antenna and find this model will not produce a reliable signal detection, but in a manner that is easily distinguishable from a true detection.

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11

Kong, Moon Sik, Ji Su Kim, Sang Pil Han, et al. "Terahertz radiation using log-spiral-based low-temperature-grown InGaAs photoconductive antenna pumped by mode-locked Yb-doped fiber laser." Optics Express 24, no. 7 (2016): 7037. http://dx.doi.org/10.1364/oe.24.007037.

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12

Kang, H.-C., T. Nishimura, T. Komori, et al. "3D-integration of a log spiral antenna onto a dual grating-gate plasmon-resonant terahertz emitter for high-directivity radiation." Journal of Physics: Conference Series 193 (November 1, 2009): 012070. http://dx.doi.org/10.1088/1742-6596/193/1/012070.

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13

Čibiraitė-Lukenskienė, Dovilė, Kęstutis Ikamas, Tautvydas Lisauskas, Viktor Krozer, Hartmut G. Roskos, and Alvydas Lisauskas. "Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector." Sensors 20, no. 15 (2020): 4087. http://dx.doi.org/10.3390/s20154087.

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This work presents, to our knowledge, the first completely passive imaging with human-body-emitted radiation in the lower THz frequency range using a broadband uncooled detector. The sensor consists of a Si CMOS field-effect transistor with an integrated log-spiral THz antenna. This THz sensor was measured to exhibit a rather flat responsivity over the 0.1–1.5-THz frequency range, with values of the optical responsivity and noise-equivalent power of around 40 mA/W and 42 pW/ Hz , respectively. These values are in good agreement with simulations which suggest an even broader flat responsivity range exceeding 2.0 THz. The successful imaging demonstrates the impressive thermal sensitivity which can be achieved with such a sensor. Recording of a 2.3 × 7.5-cm 2 -sized image of the fingers of a hand with a pixel size of 1 mm 2 at a scanning speed of 1 mm/s leads to a signal-to-noise ratio of 2 and a noise-equivalent temperature difference of 4.4 K. This approach shows a new sensing approach with field-effect transistors as THz detectors which are usually used for active THz detection.

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14

Alaş, Ali, Ahmet Öktener, and Dilek Türker. "The Sea of Marmara: New Locality for Lepeophtheirus europaensis Zedam, Berrebi, Renaud, Raibaut and Gabrion, 1988 (Copepoda, Siphonostomatoida, Caligidae) from Turkey." Transylvanian Review of Systematical and Ecological Research 19, no. 3 (2017): 29–40. http://dx.doi.org/10.1515/trser-2017-0019.

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Abstract Lepeophtheirus europaensis Zeddam, Berrebi, Renaud, Raibaut and Gabrion, 1988 (Copepoda, Siphonostomatoida, Caligidae) an ectoparasite of flatfishes, was reported for the first time in the Sea of Marmara Coasts. Some morphological characters of this parasitic copepod are given using original photographs and drawings. The general morphology, the mouth parts (antenna, mandible, maxillule, maxilla, and maxilliped), the outgrowth developed between the post-antennary process and the antenna, the setal and spinal formula from first leg to fourth leg in this study are compatible according to the specific literature.

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15

Yahyaoui, Ali, Jawad Yousaf, Amira Dhiflaoui, et al. "Design and Comparative Analysis of Ultra-wideband and High Directive Antennas for THz Applications." Applied Computational Electromagnetics Society 36, no. 3 (2021): 308–19. http://dx.doi.org/10.47037/2020.aces.j.360311.

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This work presents a comprehensive detailed comparative study of the three ultra-wideband and high directive antennas for the THz imaging, spectroscopy, and communication applications. Three different types of photoconductive antennas (log-spiral, Vivaldi, and bowtie antennas) are designed and simulated in the frequency range of 1 to 6 THz in the CST microwave studio (MWS). The enhanced directivity of the designed PCAs is achieved with the integration of the hemispherical silicon-based lens with the PCA gold electrode and quartz substrate of the proposed antennas. The performance of the designed PCAs is compared in terms of impedance and axial ratio bandwidths, directivity, and radiation efficiency of the proposed antennas. The reported log spiral, Vivaldi PCAs with added silicon lens exhibit the -10 dB impedance bandwidth of 6 THz, 3dB AR bandwidth of 5 THz, 6 THz, and 6 THz and peak total radiation efficiencies of 45%, 65%, and 95% respectively.

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16

González, F. J., and G. D. Boreman. "Comparison of dipole, bowtie, spiral and log-periodic IR antennas." Infrared Physics & Technology 46, no. 5 (2005): 418–28. http://dx.doi.org/10.1016/j.infrared.2004.09.002.

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17

Langenbach, M., A. Roggenbuck, I. Cámara Mayorga, et al. "Group Delay in THz Spectroscopy with Ultra-Wideband Log-Spiral Antennae." Journal of Infrared, Millimeter, and Terahertz Waves 35, no. 11 (2014): 918–31. http://dx.doi.org/10.1007/s10762-014-0098-4.

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18

Dhiflaoui, Amira, Ali Yahyaoui, Jawad Yousaf, et al. "Full wave numerical analysis of wideband and high directive log spiral THz photoconductive antenna." International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 33, no. 6 (2020). http://dx.doi.org/10.1002/jnm.2761.

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