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Статті в журналах з теми "Multiband I"

Автор: Grafiati

Опубліковано: 8 червня 2022

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1

Zhao, Yongqiang, Qunnie Peng, Chen Yi, and Seong G. Kong. "Multiband Polarization Imaging." Journal of Sensors 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/5985673.

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Анотація:

Multiband polarization imaging is an emerging sensing method that enables simultaneous acquisition of multiband spectral and multiangle polarization information of an object of interest in the scene. Spectral signatures of the light reflected from a target reveal the characteristics of the material composing the target while polarized light provides useful information on the surface features such as light scattering and specular reflection. In multiband spectral imaging, combined spectral and polarization information offers a comprehensive representation of an object utilizing complementary spectral and polarization information in visual sensing. Multiband polarization imaging has demonstrated a potential in the recognition of targets in challenging operating environments such as low-contrast and hazy conditions. This paper presents the concept and recent advances of multiband polarization imaging techniques, in particular, a bioinspired multiband polarization vision system. Applications of multiband polarization imaging in various fields include atmospheric observation, object detection and classification, medical diagnostics, surveillance, and 3D object reconstruction.

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2

NAGAO, HIDEMI, SERGEI P. KRUCHININ, ANATOLI M. YAREMKO, and KIZASHI YAMAGUCHI. "MULTIBAND SUPERCONDUCTIVITY." International Journal of Modern Physics B 16, no. 23 (September 10, 2002): 3419–28. http://dx.doi.org/10.1142/s0217979202012220.

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Multi-band superconductivity is investigated by using two-particle Green's function techniques, and equations for coupled states are derived in the framework of a two-band model. These results suggest that superconductivity appears, even if electron–electron interaction is positive. We also present a cooperative mechanism for multi-band superconductivity.

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3

Kruchinin, S. P. "Multiband Superconductors." Reviews in Theoretical Science 4, no. 2 (June 1, 2016): 165–78. http://dx.doi.org/10.1166/rits.2016.1057.

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4

Garcia-Lamperez, Alejandro, and Magdalena Salazar-Palma. "Single-Band to Multiband Frequency Transformation for Multiband Filters." IEEE Transactions on Microwave Theory and Techniques 59, no. 12 (December 2011): 3048–58. http://dx.doi.org/10.1109/tmtt.2011.2170579.

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5

Yu, Yuchi, Han Jia, Yuzhen Yang, Han Zhao, Quanquan Shi, Peng Kong, Jun Yang, and Ke Deng. "Multi-order resonators for acoustic multiband asymmetric absorption and reflection." Journal of Applied Physics 131, no. 13 (April 7, 2022): 135102. http://dx.doi.org/10.1063/5.0084450.

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We propose a multiband asymmetric acoustic absorption and reflection system constructed from a waveguide and multi-order resonators with different radiant modes. Theoretical and experimental results confirm that the coupling of the dark and bright modes at each resonant frequency enables multiband high-efficiency absorption requiring only two functional units. More interestingly, we demonstrate a hybrid multiband asymmetric system based on customized multi-mode pairs. One side of the hybrid multiband system almost completely absorbs the lower frequency incident sound waves while reflecting the higher frequency ones; conversely, the other side effectively reflects the lower frequency ones and absorbs the higher frequency ones. Our design showcases the flexibility of customized multiband asymmetric absorption and also provides an approach for the design of bidirectional wave-manipulation devices.

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6

Anguera, Jaume, Aurora Andújar, José Luis Leiva, Oriol Massó, Joakim Tonnesen, Endre Rindalsholt, Rune Brandsegg, and Roberto Gaddi. "Reconfigurable Multiband Operation for Wireless Devices Embedding Antenna Boosters." Electronics 10, no. 7 (March 29, 2021): 808. http://dx.doi.org/10.3390/electronics10070808.

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Wireless devices such as smart meters, trackers, and sensors need connections at multiple frequency bands with low power consumption, thus requiring multiband and efficient antenna systems. At the same time, antennas should be small to easily fit in the scarce space existing in wireless devices. Small, multiband, and efficient operation is addressed here with non-resonant antenna elements, featuring volumes less than 90 mm3 for operating at 698–960 MHz as well as some bands in a higher frequency range of 1710–2690 MHz. These antenna elements are called antenna boosters, since they excite currents on the ground plane of the wireless device and do not rely on shaping complex geometric shapes to obtain multiband behavior, but rather the design of a multiband matching network. This design approach results in a simpler, easier, and faster method than creating a new antenna for every device. Since multiband operation is achieved through a matching network, frequency bands can be configured and optimized with a reconfigurable matching network. Two kinds of reconfigurable multiband architectures with antenna boosters are presented. The first one includes a digitally tunable capacitor, and the second one includes radiofrequency switches. The results show that antenna boosters with reconfigurable architectures feature multiband behavior with very small sizes, compared with other prior-art techniques.

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7

Amirov, S. F., B. Kh Khushbokov, and N. E. Balgaev. "Multiband current transformers." Russian Electrical Engineering 80, no. 2 (February 2009): 119–21. http://dx.doi.org/10.3103/s1068371209020126.

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8

Griffin, Daniel W., and Jae S. Lim. "Multiband excitation vocoder." IEEE Transactions on Acoustics, Speech, and Signal Processing 36, no. 8 (August 1988): 1223–35. http://dx.doi.org/10.1109/29.1651.

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9

Walbeoff, A., and R. J. Langley. "Multiband PCB antenna." IEE Proceedings - Microwaves, Antennas and Propagation 152, no. 6 (2005): 471. http://dx.doi.org/10.1049/ip-map:20050053.

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10

Sabah, Cumali. "Multiband planar metamaterials." Microwave and Optical Technology Letters 53, no. 10 (July 20, 2011): 2255–58. http://dx.doi.org/10.1002/mop.26296.

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11

Dias, R. G., and A. M. Marques. "Frustrated multiband superconductivity." Superconductor Science and Technology 24, no. 8 (June 30, 2011): 085009. http://dx.doi.org/10.1088/0953-2048/24/8/085009.

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12

Kandwal, Abhishek, Jai Verdhan Chauhan, and Sunil Kumar Khah. "Multiband-coupled sectoral antenna using high and low dielectric constant substrates." International Journal of Microwave and Wireless Technologies 7, no. 6 (July 24, 2014): 721–26. http://dx.doi.org/10.1017/s1759078714000919.

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Анотація:

Design analysis of multiband-coupled stacked sectoral antenna array with finite ground plane using high low dielectric constant substrates is proposed in this paper for modern communication systems and applied physics. Multiband planar antennas have been extensively developed due to demands for integration of wireless communication systems. In this paper, we present the design and development of a multiband microstrip antenna array with parasitic coupling and stacking using two different substrates. The stacked designed antenna resonates at three different frequencies: 3.8, 5.4, and 10 GHz; therefore, showing a multiband property with good radiation (far-field) characteristics. A significant comparison study is also presented considering different dielectric constant substrates. The proposed antenna is an attractive solution for different wireless communication systems such as mobile systems, satellite systems, etc.

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13

Arablouei, Reza. "Fusing Multiple Multiband Images." Journal of Imaging 4, no. 10 (October 12, 2018): 118. http://dx.doi.org/10.3390/jimaging4100118.

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High-resolution hyperspectral images are in great demand but hard to acquire due to several existing fundamental and technical limitations. A practical way around this is to fuse multiple multiband images of the same scene with complementary spatial and spectral resolutions. We propose an algorithm for fusing an arbitrary number of coregistered multiband, i.e., panchromatic, multispectral, or hyperspectral, images through estimating the endmember and their abundances in the fused image. To this end, we use the forward observation and linear mixture models and formulate an appropriate maximum-likelihood estimation problem. Then, we regularize the problem via a vector total-variation penalty and the non-negativity/sum-to-one constraints on the endmember abundances and solve it using the alternating direction method of multipliers. The regularization facilitates exploiting the prior knowledge that natural images are mostly composed of piecewise smooth regions with limited abrupt changes, i.e., edges, as well as coping with potential ill-posedness of the fusion problem. Experiments with multiband images constructed from real-world hyperspectral images reveal the superior performance of the proposed algorithm in comparison with the state-of-the-art algorithms, which need to be used in tandem to fuse more than two multiband images.

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14

Ren, Han, Jin Shao, Mi Zhou, Bayaner Arigong, Jun Ding, and Hualiang Zhang. "Novel design of multiband branch-line coupler using multiband transmission lines." Microwave and Optical Technology Letters 56, no. 12 (September 26, 2014): 2841–45. http://dx.doi.org/10.1002/mop.28722.

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15

Wang, Zhebin, and Chan-Wang Park. "Novel Multiband Matching Network Using Resonators for Multiband Power Amplifier Applications." Microwave and Optical Technology Letters 55, no. 10 (July 26, 2013): 2469–75. http://dx.doi.org/10.1002/mop.27888.

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16

Zhu, Zhihui, and Michael B. Wakin. "Approximating Sampled Sinusoids and Multiband Signals Using Multiband Modulated DPSS Dictionaries." Journal of Fourier Analysis and Applications 23, no. 6 (August 29, 2016): 1263–310. http://dx.doi.org/10.1007/s00041-016-9498-2.

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17

Wang, Zhebin, and Chan-Wang Park. "Pi-shaped quarter wavelength structure for multiband applications." International Journal of Microwave and Wireless Technologies 5, no. 6 (August 28, 2013): 735–48. http://dx.doi.org/10.1017/s175907871300072x.

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Анотація:

In this paper, for the first time, we present a novel Pi-shaped structure using resonators for multiband applications. The multiband Pi-shaped structure with LC resonators is analyzed. In order to demonstrate the proposed multiband Pi-shaped structure, one tri-band Wilkinson power divider and one tri-band rat-race coupler are designed, fabricated, and tested. The compactness of the two demonstrated components is well kept by putting all stubs with resonators inside the components themselves. Measured results are in good agreement with the simulated results.

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18

Arun, M. "A Monopole Antenna at Quad Band Frequency for Indoor Application." International Journal for Research in Applied Science and Engineering Technology 9, no. VIII (August 14, 2021): 331–36. http://dx.doi.org/10.22214/ijraset.2021.37340.

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Анотація:

In this paper we concentrate on design of multiband antenna for existing wireless services. At present, the available techniques are modifying the main radiator (bending, folding, meandering and wrapping) which affects the size of antenna. This makes it more complex in implementing on RF circuits. To achieve multiband capability along with compactness in size we go with slotted multiband planar system. Here we design antenna in such a way in works on quad band frequency i.e., GPS, WiMax and WLAN(IEEE 802.11 a,b) for indoor application.

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19

R, Banuprakash, GSPN Amith, Gagana N, Ravi AG, and Pavanashree C. "Design of Multiband Antenna for Wimax and WLAN Applications Using DGS." International Journal of Engineering & Technology 7, no. 3.12 (July 20, 2018): 140. http://dx.doi.org/10.14419/ijet.v7i3.12.15904.

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In this paper, a multiband antenna with a micro strip feed line is presented. This antenna is designed on FR4 substrate with dielectric constant 4.4 having overall size of 20 × 20 × 1.6mm3. The proposed antenna comprises defected ground structure with T and L shape slots to achieve multiband frequencies. This multiband antenna covers three different frequencies as 3.3 GHz, 3.85 GHz and 5.25 GHz. All of these frequencies are applicable for WiMAX and WLAN applications respectively. Return loss (S11), Gain and Radiation patterns are simulated and observed on HFSS.

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20

Qiujiao Du, Qiujiao Du, Jinsong Liu Jinsong Liu, and Hongwu Yang Hongwu Yang. "Compact multiband left-handed metamaterial at terahertz frequencies." Chinese Optics Letters 9, no. 11 (2011): 110015–18. http://dx.doi.org/10.3788/col201109.110015.

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21

Shi, Chen, Jinsong Zhao, David M. Malaspina, Stuart D. Bale, Xiangcheng Dong, Tieyan Wang, and Dejin Wu. "Multiband Electrostatic Waves below and above the Electron Cyclotron Frequency in the Near-Sun Solar Wind." Astrophysical Journal Letters 926, no. 1 (February 1, 2022): L3. http://dx.doi.org/10.3847/2041-8213/ac4d37.

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Abstract Using the Parker Solar Probe measurements, this Letter reports two new types of multiband electrostatic waves in and near the heliospheric current sheet. They are classified into the f < f ce and f > f ce multiband electrostatic waves, in which most (or all) of the bands in the former type are lower than f ce, and all of the bands in the latter type are higher than f ce, where f and f ce denotes the wave frequency and the electron cyclotron frequency, respectively. This Letter also exhibits observational evidence of the existence of nonlinear wave–wave interactions of both types of electrostatic waves. In particular, the f > f ce multiband electrostatic waves are found to be modulated in the presence of low-frequency oblique ion-scale waves. According to the observed frequency distribution, this Letter proposes that the mode nature of the f < f ce multiband electrostatic waves could be the oblique ion acoustic wave or the lower-hybrid wave, and the f > f ce multiband electrostatic waves are the electron Bernstein mode wave. These findings provide a challenge to understand the complex electron and ion dynamical processes in and near the heliospheric current sheet.

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22

Aziz, Rao Shahid, Majeed A. S. Alkanhal, and Abdel-Fattah Sheta. "MULTIBAND FRACTAL-LIKE ANTENNAS." Progress In Electromagnetics Research B 29 (2011): 339–54. http://dx.doi.org/10.2528/pierb11030904.

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23

Tanaka, Y., T. Yanagisawa, A. Crisan, P. M. Shirage, A. Iyo, K. Tokiwa, T. Nishio, A. Sundaresan, and N. Terada. "Domains in multiband superconductors." Physica C: Superconductivity and its Applications 471, no. 21-22 (November 2011): 747–50. http://dx.doi.org/10.1016/j.physc.2011.05.043.

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24

Deshmukh, AmitA, and KP Ray. "Multiband Rectangular Microstrip Antennas." IETE Journal of Research 57, no. 5 (2011): 437. http://dx.doi.org/10.4103/0377-2063.90160.

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25

Gu, Chao, Shao-Bo Qu, Zhi-Bin Pei, Zhuo Xu, Jia Liu, and Wei Gu. "Multiband terahertz metamaterial absorber." Chinese Physics B 20, no. 1 (January 2011): 017801. http://dx.doi.org/10.1088/1674-1056/20/1/017801.

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26

HORI, T. "Broadband/Multiband Printed Antennas." IEICE Transactions on Communications E88-B, no. 5 (May 1, 2005): 1809–17. http://dx.doi.org/10.1093/ietcom/e88-b.5.1809.

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27

Wang, Jiafu, Shabo Qu, Yiming Yang, Hua Ma, Xiang Wu, and Zhuo Xu. "Multiband left-handed metamaterials." Applied Physics Letters 95, no. 1 (July 6, 2009): 014105. http://dx.doi.org/10.1063/1.3170236.

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28

van Straten, F., B. Smolders, A. van Zuijlen, and R. Ooijman. "Multiband cellular RF solutions." IEEE Journal of Solid-State Circuits 39, no. 10 (October 2004): 1598–604. http://dx.doi.org/10.1109/jssc.2004.833558.

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29

Abbasi, Nisar Ahmad, Richard Langley, and Shahid Bashir. "Multiband shorted monopole antenna." Journal of Electromagnetic Waves and Applications 28, no. 5 (February 5, 2014): 618–33. http://dx.doi.org/10.1080/09205071.2014.882271.

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30

Müller, Karl-Hartmut, Günter Fuchs, Stefan-Ludwig Drechsler, Ingo Opahle, Helmut Eschrig, Ludwig Schultz, Günter Behr, et al. "Multiband superconductivity in HoNi2B2C." Physica C: Superconductivity and its Applications 460-462 (September 2007): 99–102. http://dx.doi.org/10.1016/j.physc.2007.03.294.

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31

Labiad, Abdelhadi, Khadidja Bouras, and Mouloud Bouzouad. "Metamaterials Reconfigurable Multiband Antenna." Advanced Science, Engineering and Medicine 11, no. 11 (November 1, 2019): 1097–99. http://dx.doi.org/10.1166/asem.2019.2460.

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Анотація:

In this paper a Metamaterials Reconfigurable Multiband Antenna is designed. The design consists of a rectangular patch antenna surrounded by an arrangement of cross shaped metamaterials cells that have two different behaviours and can be controlled electronically in order to switch between the two different behaviours; therefore, the antenna will have a controllable size according to the surrounding area behaviour. The obtained results show that the antenna operates at different frequencies. We demonstrate the possibility to design a metamaterials based frequency agile antenna.

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32

Korshunov, Maksim M., Yuliya N. Togushova, and O. V. Dolgov. "Impurities in multiband superconductors." Uspekhi Fizicheskih Nauk 186, no. 12 (December 2016): 1315–47. http://dx.doi.org/10.3367/ufnr.2016.07.037863.

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33

Korshunov, M. M., Yu N. Togushova, and O. V. Dolgov. "Impurities in multiband superconductors." Physics-Uspekhi 59, no. 12 (December 31, 2016): 1211–40. http://dx.doi.org/10.3367/ufne.2016.07.037863.

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34

Goelman, G., and J. S. Leigh. "Multiband Adiabatic Inversion Pulses." Journal of Magnetic Resonance, Series A 101, no. 2 (February 1993): 136–46. http://dx.doi.org/10.1006/jmra.1993.1023.

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35

Basavarajappa, Vedaprabhu, and Vincent Fusco. "Multiband evanescent waveguide antenna." Microwave and Optical Technology Letters 57, no. 3 (January 23, 2015): 540–42. http://dx.doi.org/10.1002/mop.28896.

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36

Rao, Qinjiang, and Wen Geyi. "Folded multiband strip antenna." Microwave and Optical Technology Letters 52, no. 9 (June 17, 2010): 2087–90. http://dx.doi.org/10.1002/mop.25390.

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37

Prakash, Om, A. Thamizhavel, and S. Ramakrishnan. "Multiband superconductivity in Lu3Os4Ge13." Superconductor Science and Technology 28, no. 11 (September 29, 2015): 115012. http://dx.doi.org/10.1088/0953-2048/28/11/115012.

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38

Yang, Feiran, and Jun Yang. "Multiband‐structured Kalman filter." IET Signal Processing 12, no. 6 (August 2018): 722–28. http://dx.doi.org/10.1049/iet-spr.2017.0313.

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39

Kondo, Jun. "Theory of Multiband Superconductivity." Journal of the Physical Society of Japan 71, no. 5 (May 15, 2002): 1353–59. http://dx.doi.org/10.1143/jpsj.71.1353.

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40

Feng, Yan, and Xiaodong Wang. "Adaptive Multiband Spectrum Sensing." IEEE Wireless Communications Letters 1, no. 2 (April 2012): 121–24. http://dx.doi.org/10.1109/wcl.2012.022012.110230.

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41

Yu, K. M., W. Walukiewicz, J. W. Ager, D. Bour, R. Farshchi, O. D. Dubon, S. X. Li, I. D. Sharp, and E. E. Haller. "Multiband GaNAsP quaternary alloys." Applied Physics Letters 88, no. 9 (February 27, 2006): 092110. http://dx.doi.org/10.1063/1.2181627.

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42

Aziz, P., H. Sorensen, and J. van der Spiegel. "Multiband sigma-delta modulation." Electronics Letters 29, no. 9 (1993): 760. http://dx.doi.org/10.1049/el:19930509.

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43

Tang and Wahid. "Hexagonal fractal multiband antenna." IEEE Antennas and Wireless Propagation Letters 3 (2004): 111–12. http://dx.doi.org/10.1109/lawp.2004.829989.

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44

Haider, N., D. Caratelli, and A. G. Yarovoy. "Recent Developments in Reconfigurable and Multiband Antenna Technology." International Journal of Antennas and Propagation 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/869170.

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Анотація:

A comparative analysis of various reconfigurable and multiband antenna concepts is presented. In order to satisfy the requirements for the advanced systems used in modern wireless and radar applications, different multiband and reconfigurable antennas have been proposed and investigated in the past years. In this paper, these design concepts have been classified into three basic approaches: tunable/switchable antenna integration with radio-frequency switching devices, wideband or multiband antenna integration with tunable filters, and array architectures with the same aperture utilized for different operational modes. Examples of each design approach are discussed along with their inherent benefits and challenges.

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45

Et.al, R. Ramasamy. "Design and Analysis of Multiband Bloom Shaped Patch Antenna for IoT Applications." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 3 (April 10, 2021): 4578–85. http://dx.doi.org/10.17762/turcomat.v12i3.1848.

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Анотація:

A Microstrip Bloom shaped patch antenna is proposed for Internet of Things (IoT) application. This antenna operates at multiband frequencies between 1.6 GHz to 2.45 GHz. The Bloom shaped antenna provides multiband response that examined in HFSS Software. In this proposed antenna design, FR4 substrate material is used because it is easily available and low cost. The proposed antenna structure simulated and analyzed in different experimental results including return loss measurement, Voltage Standing Wave Ratio measurement, radiation pattern measurement and gain measurement. This proposed Multiband Microstrip Bloom shaped patch antenna provides better experimental results in all the parameters

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46

Wang, Junjun, and Xudong He. "Analysis and Design of a Novel Compact Multiband Printed Monopole Antenna." International Journal of Antennas and Propagation 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/694819.

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Анотація:

A compact multiband printed monopole antenna is presented. The proposed antenna, composed of a modified broadband T-shaped monopole antenna integrating some band-notch structures in the metallic patch, is excited by means of a microstrip line. To calculate the bandwidth starting frequency (BSF) of the T-shaped broadband antenna, an improved formula is proposed and discussed. The multiband operation is achieved by etching three inverted U-shaped slots on the radiant patch. By changing the length of the notch slots, operation bands of the multiband antenna can be adjusted conveniently. The antenna is simulated in Ansoft HFSS and then fabricated and measured. The measurement results show that the proposed antenna operates at 2.25–2.7 GHz, 3.25–3.6 Hz, 4.95–6.2 GHz, and 7-8 GHz, covering the operation bands of Bluetooth, WiMAX, WLAN, and downlink of X-band satellite communication system and thus making it a proper candidate for the multiband devices.

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47

Anand, C. "Design of Compact MIMO Multiband Antenna for Wireless Radio Communication Application." September 2021 3, no. 3 (November 25, 2021): 170–81. http://dx.doi.org/10.36548/jsws.2021.3.004.

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Анотація:

Slot and patch modification for the design of a compact multiband antenna with Multi-Input-Multi-Output (MIMO) functionality is proposed in this paper. At various frequency bands, the antenna performance is obtained by modification and addition of slot and patch shapes in the design of the compact MIMO multiband antenna. Addition of slots or patches is done separately in the already existing multiband antenna designs. Whereas in this work, the addition of slot and patch are combined. Arlon Diclad 880 with a dielectric constant of 2.17 - 2.2 (εr) and height 0.75mm is used for the antenna design. The MIMO multiband antenna with the dimension of 12.5 mm × 7.5 mm is designed. On various millimeter-wave frequency bands ranging from 20 GHz to 40 GHz, the MIMO antenna can function as observed in the results of simulation and evaluation. This work shows that microstrip antennas can be added with slots and patches during their design and development, thereby enabling the antenna to operate under multiple frequency bands.

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48

Kang, You Sun, and Duk Shin. "Multiband Camera System Using Color and Near Infrared Images." Applied Mechanics and Materials 446-447 (November 2013): 922–26. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.922.

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Анотація:

Various applications using a camera system have been developed and deployed commercially to improve our daily life. The performance of camera system is mainly dependent on image quality and illumination conditions. Multiband camera has been developed to provide a wealth of information for image acquisition. In this paper, we developed two applications about image segmentation and face detection using a multiband camera, which is available in four bands consisting of a near infrared and three color bands. We proposed a multiband camera system to utilize two different images i.e. color image extracted from Bayer filter and near infrared images. The experimental results showed the effectiveness of the proposed system.

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Lian, Ji-Shun, Shan-Qin Wang, Wen-Pei Gan, Jing-Yao Li, and En-Wei Liang. "Modeling the Multiband Light Curves of the Afterglows of Three Gamma-Ray Bursts and their Associated Supernovae." Astrophysical Journal 931, no. 2 (May 27, 2022): 90. http://dx.doi.org/10.3847/1538-4357/ac69db.

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Анотація:

Abstract Some dozen supernovae (SNe) associated with long gamma-ray bursts (GRBs) have been confirmed. Most of the previous studies derive the physical properties of the GRB-SNe by fitting the constructed (pseudo-)bolometric light curves. However, many GRB-SNe only have a few filter data, for which the (pseudo-)bolometric light curves are very difficult to construct. Additionally, constructing (pseudo-)bolometric light curves rely on some assumptions. In this paper, we use the multiband broken power-law plus 56Ni model to fit the multiband light curves of the afterglows and the SNe (SN 2001ke, SN 2013dx, and SN 2016jca) associated with three GRBs (GRB 011121, GRB 130702A, and GRB 161219B). We find our model can account for the multiband light curves of the three GRB-SNe (except for the late-time z-band light curve of two events), indicating that the model is a reliable model. The 56Ni masses we derive are higher than those in the literature. This might be due to the fact that the 56Ni masses in the literature are usually obtained by fitting the pseudo-bolometric light curves whose luminosities are usually (significantly) underestimated. We suggest that the multiband model can not only be used to fit the multiband light curves of GRB-SNe that have many filter observations, but also fit those having sparse data.

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50

Beigi, Payam, Yashar Zehforoosh, Mirhamed Rezvani, and Javad Nourinia. "Evaluation of a compact triangular crinkle-shaped multiband antenna with circular polarized for ITU band based on MADM method." Circuit World 45, no. 4 (November 4, 2019): 292–99. http://dx.doi.org/10.1108/cw-04-2019-0040.

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Анотація:

Purpose This paper aims to present a new triangular crinkle-shaped multiband antenna for multiband operation. Design/methodology/approach This paper refers to increasing the number of resonance frequency by appending triangular crinkle. Experimental frequency results of the presented antenna are 1.60/2.80/4.00/5.80/7.12/8.32/10.06 GHz. Findings The triangular shaped antenna is manufactured on a low-priced FR-4 substrate with small size and tested. The reported antenna with full size 14 × 14 mm2 with a half elliptical ground sheet on the bottom plane of the substrate and a triangular crinkle strip patch in the front of the substrate. The reported antenna has dual polarized, by rectangular slits on the ground sheet can produce the CP radiation on ITU band. The radiation characteristics indicate the mentioned antenna plays good task for multiband structures. Simulation and measured consequences are in desirable agreement and refer to agreeable operation for the introduced antenna. Originality/value Also, an evaluation is done based on multiple attribute decision-making method for comparison the proposed monopole antenna with some previously presented multiband monopole antennas.

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