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Journal articles on the topic 'Tapered matching'

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Author: Grafiati

Published: 14 March 2023

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1

Xie, Yangbo, Adam Konneker, Bogdan-Ioan Popa, and Steven A. Cummer. "Tapered labyrinthine acoustic metamaterials for broadband impedance matching." Applied Physics Letters 103, no. 20 (November 11, 2013): 201906. http://dx.doi.org/10.1063/1.4831770.

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2

Zhang, Chunjin, Yongsheng Ren, Shujuan Ji, and Jinfeng Zhang. "Analysis of the Vibration and Chatter Stability of a Tapered Composite Boring Bar." Shock and Vibration 2020 (June 27, 2020): 1–11. http://dx.doi.org/10.1155/2020/4190806.

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As metal boring bars have low dynamic stiffness, chatter is easily induced during the boring process. Therefore, improvement of the chatter stability is an open problem that requires further study. Though researchers proved that the composite materials suitable for making tapered boring bars can further improve the dynamic stiffness to meet the need of high-speed boring, existing research studies did not study the dynamic characteristics of the tapered composite boring bar comprehensively. In particular, no research has been done about the natural frequency and chatter stability of the composite boring bar under various taper ratios. Therefore, in this paper, a model of a tapered composite boring bar is established based on the Adomian modified decomposition method (AMDM). Second, this paper verifies the effectiveness of the AMDM by using the ANSYS software. Moreover, this paper studies the natural frequency of the boring bar model under various situations. Third, we verify the convergence of chatter stability of the boring bar model. Finally, the chatter stability of the tapered composite boring bar is analyzed comprehensively. The results show that the natural frequency and the chatter stability of the tapered model can be improved by choosing appropriate taper ratio, ply angle, stacking sequences, L/D ratio, T/D ratio, and the carbon composite. The results are helpful for the design of high-quality tapered composite boring bars matching the need of high speed cutting. In particular, these results can provide guidelines for adjusting the cutting speed in CNC boring and can further improve the surface finish of the machined workpieces.

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3

Kim, Seokjin, Hyekyoung Jwa, and Hosung Chang. "Design of impedance-matching circuits with tapered transmission lines." Microwave and Optical Technology Letters 20, no. 6 (March 20, 1999): 403–7. http://dx.doi.org/10.1002/(sici)1098-2760(19990320)20:6<403::aid-mop13>3.0.co;2-e.

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4

Vegni, L., A. Toscano, and F. Bilotti. "Tapered stripline embedded in inhomogeneous media as microwave matching line." IEEE Transactions on Microwave Theory and Techniques 49, no. 5 (May 2001): 970–78. http://dx.doi.org/10.1109/22.920156.

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5

Payne, Philip W. "Tapered tube impedance matching underwater voice communicator with bubble silencer." Journal of the Acoustical Society of America 79, no. 2 (February 1986): 586. http://dx.doi.org/10.1121/1.393520.

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6

Yu, Yinni, Phillip Blake, and D. Keith Roper. "Tapered Optical Fibers Designed for Surface Plasmon Resonance Phase Matching." Langmuir 25, no. 1 (January 6, 2009): 59–63. http://dx.doi.org/10.1021/la801953z.

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7

Simons, R. N., and R. Q. Lee. "Impedance matching of tapered slot antenna using a dielectric transformer." Electronics Letters 34, no. 24 (1998): 2287. http://dx.doi.org/10.1049/el:19981612.

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8

Song, Choongho, and Sangseol Lee. "Design of a tapered impedance-matching line using inverse scattering." Microwave and Optical Technology Letters 32, no. 5 (January 25, 2002): 393–96. http://dx.doi.org/10.1002/mop.10188.

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9

Al-Obaidi, Mohammed K., Ezri Mohd, Noorsaliza Abdullah, Samsul Haimi Dahlan, and Jawad Ali. "Design and implementation of microstrip rotman lens for ISM band applications." Bulletin of Electrical Engineering and Informatics 8, no. 1 (March 1, 2019): 90–98. http://dx.doi.org/10.11591/eei.v8i1.1392.

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This work presents the design and implementation of Rotman lens as a beam steering device for Industrial, Scientific, and Medical (ISM) applications. 2.45 GHz is considered as a center frequency design with (2-6) GHz frequency bandwidth. The beam steering is examined to cover ±21o scan angle with maximum main lobe magnitude 10.1 dBi, rectangular patch antennas are used as radiation elements to beam the output far field. The work is extended to compare between the tapered line which is used for matching between 50-Ω ports and lens cavity. CST microwave simulation studio results show that the rectangular taper line can yield 2 dB return loss less than linear taper line with a little bit shifting in responses for same input and load impedance.

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10

Abdulnabi, Hussein A., Refat T. Hussein, and Raad S. Fyath. "UWB Single Port Log Periodic Toothed Terahertz Antenna Design Based on Graphene Artificial Magnetic Conductor." Modern Applied Science 11, no. 3 (January 14, 2017): 86. http://dx.doi.org/10.5539/mas.v11n3p86.

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In this work, a single port exponential tapered toothed log periodic antenna based on graphene artificial magnetic conductor (AMC) is suggested for ultra-wideband (1–10) THz operation. The resonance frequency of the proposed antenna can be tuned by changing the connected DC voltage which leads to variation in the chemical potential of the graphene.The radiating toothed log periodic antenna consists of gold patch placed on 25x25 graphene patches which act as an AMC surface unit. Exponential taper is used to satisfy impedance matching between the antenna and the feeder over the frequency range. The simulation results reveal that 90% of frequency range satisfies when the chemical potential is1eV.

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11

Razzaz, Faroq, Saud Saeed, and Majeed Alkanhal. "Compact Ultra-Wideband Wilkinson Power Dividers Using Linearly Tapered Transmission Lines." Electronics 11, no. 19 (September 27, 2022): 3080. http://dx.doi.org/10.3390/electronics11193080.

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In this work, compact extended ultra-wideband (UWB) Wilkinson power dividers (WPDs) using tapered transmission lines are analyzed, designed, and measured. Utilizing carefully designed tapered transmission sections results in widening the operational bandwidth and reducing the element dimensions. Analytical models and design procedures of simple and compact and equal and unequal UWB WPDs based on linearly tapered transmission lines are developed and outlined in this paper. Four different configurations of equal and unequal power dividers are designed and presented. The number and locations of the isolation resistors have a noticeable effect on extending the operational bandwidth of the dividers. The presented designs of the WPDs have superior performance over extended bandwidths. The simulation and experimental results are in very good agreement with good insertion and return loss, good matching, and isolation, over the extended UWB operational bandwidth from 3 GHz to 27 GHz.

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12

Kang, Y., H. C. Cheng, C. W. Lee, and S. Y. Hu. "Investigations in Hydrostatic Planar Bearings Compensated by Tapered-Spool Restrictors II: Load Capacity and Static Stiffness." Journal of Mechanics 32, no. 1 (July 15, 2015): 71–82. http://dx.doi.org/10.1017/jmech.2015.42.

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ABSTRACTThis study including two parts investigates the influence of design parameters of tapered-spool restrictors and hydrostatic planar bearing on static characteristics of load capacity and static stiffness. The former part provides guides for the design of single-action and double-action tapered-spool restrictors. This part provides design guides for planar hydrostatic bearing and for matching up with tapered-spool restrictor. The equations of flow continuity are utilized to determine the film thickness for open-type planar bearing and worktable displacement for closed-type planar bearing with respect to the recess pressure, respectively. The load capacity can be obtained by multiplying recess pressure by effective area of bearing pad. Furthermore, the static stiffness can be obtained by differentiating the recess pressure with respect to film thickness or worktable displacement. The finding results give that the usage range of recess pressure, and the availability ranges of design parameters of restrictor and bearing parameters. Which are found for getting the maximum stiffness.

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13

de Villiers, D. I. L., P. W. van der Walt, and P. Meyer. "Design of Conical Transmission Line Power Combiners Using Tapered Line Matching Sections." IEEE Transactions on Microwave Theory and Techniques 56, no. 6 (June 2008): 1478–84. http://dx.doi.org/10.1109/tmtt.2008.923879.

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14

Daniel, Shoshana R., Katrina Armstrong, Jeffrey H. Silber, and Paul R. Rosenbaum. "An Algorithm for Optimal Tapered Matching, With Application to Disparities in Survival." Journal of Computational and Graphical Statistics 17, no. 4 (December 2008): 914–24. http://dx.doi.org/10.1198/106186008x385806.

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15

Dwivedi, Smrity, and Pradeep Kumar Jain. "Performance Improvement Study of Tapered Magnetically Insulated Line Oscillator Through Impedance Matching." IEEE Transactions on Plasma Science 42, no. 9 (September 2014): 2186–92. http://dx.doi.org/10.1109/tps.2014.2341639.

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16

Nour, Amro A., Ali Bostani, and Girish Awadhwal. "A Tapered Fork-Shaped Antenna With Small Ground Plane for UWB Applications." International Journal of Interdisciplinary Telecommunications and Networking 13, no. 1 (January 2021): 13–24. http://dx.doi.org/10.4018/ijitn.2021010102.

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A tapered fork-shaped antenna having small ground for ultra-wide band (UWB) antenna is proposed in this paper. Finite element method has been successfully employed to simulate and optimize the feed line, ground, and tapered fork-shaped diameter to enhance the performance of the antenna in terms of bandwidth obviously for the ultra-wideband purposes. An acceptable impedance matching performance has been achieved, which is a band wider than the UWB band that is defined by the Federal Communications Commission (FCC). In this paper, the detailed design parameters including the key elements in bandwidth enhancement is presented. The results of the finite element simulations have been presented as well indicating the return loss and radiation pattern of the proposed antenna.

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17

Hu, Hongyu, Wenbo Li, Xiang Zhang, and Niloy K. Dutta. "Broadband Supercontinuum Generation in a Tapered-Rib Lead-Silicate Waveguide." International Journal of High Speed Electronics and Systems 24, no. 03n04 (September 2015): 1550009. http://dx.doi.org/10.1142/s0129156415500093.

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We have studied supercontinuum generation in a tapered-rib lead-silicate waveguide. The Air-SF57 glass-SiO2 waveguide is 2 cm long, with a varying etch depth to manage the dispersion profile. Numerical simulations are conducted for input sech2 pulses centered at 1.55 μm. Due to continuous modification of the phase matching condition for dispersive wave emission, the proposed waveguide geometry generates broadband output spectrum extending from ~1 μm to ~4.6 μm at −30 dB level. With proper pumping conditions, fully coherent supercontinuum can be obtained.

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18

Yong Bae Park, Keum Cheol Hwang, and Ikmo Park. "Mode Matching Analysis of a Tapered Coaxial Tip in a Parallel-Plate Waveguide." IEEE Microwave and Wireless Components Letters 18, no. 3 (March 2008): 152–54. http://dx.doi.org/10.1109/lmwc.2008.916773.

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19

Shohat, J., I. D. Robertson, and S. J. Nightingale. "10-Gb/s driver amplifier using a tapered gate line for improved input matching." IEEE Transactions on Microwave Theory and Techniques 53, no. 10 (October 2005): 3115–20. http://dx.doi.org/10.1109/tmtt.2005.855119.

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20

Lan Feng, Yang Zi-Qiang, and Shi Zong-Jun. "Coaxial Bragg reflector with small tapered inner rode corrugated ripples and phase matching section." Acta Physica Sinica 60, no. 9 (2011): 091101. http://dx.doi.org/10.7498/aps.60.091101.

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21

Bürklein, Sebastian, Lennart Zupanc, David Donnermeyer, Karsten Tegtmeyer, and Edgar Schäfer. "Effect of Core Mass and Alloy on Cyclic Fatigue Resistance of Different Nickel-Titanium Endodontic Instruments in Matching Artificial Canals." Materials 14, no. 19 (October 1, 2021): 5734. http://dx.doi.org/10.3390/ma14195734.

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Instrument failure during root canal preparation is still a concern among endodontists. However, it remains unclear whether the use of more martensitic alloys or the cross-sectional design parameters (i.e., core mass) significantly improve fracture resistance. The aim of the study was to evaluate the impact of core mass and alloy on dynamic cyclic fatigue resistance of nickel-titanium endodontic instruments in matching artificial canals at body temperature. Two groups were tested. (A) taper 0.04: F360 (Komet, Lemgo, Germany), Twisted file (Sybron Endo, Glendora, CA, USA) (=TF), JIZAI (Mani, Tochigi, Japan) (=J_04) (all size #25) and the variable tapered TruNatomy (Dentsply, Ballaigues, Switzerland) (size #26) (=TN). (B) size #25; taper 0.06: (Mtwo (VDW, Munich, Germany), JIZAI (Mani) (=J_06), and variable tapered Hyflex EDM OneFile (Coltene Whaledent, Altstätten, Switzerland) (=HF). Time, number of cycles to fracture (NCF), and number and length of fractured fragments were recorded and statistically analysed using ANOVA Student-Newman-Keuls, Kruskal–Wallis or Chi-square test (significance level = 0.05). (A) TN showed the significantly shortest time until fracture, followed by TF, F360 and J_04 which also differed significantly, while NCF showed the following order: F360 < TN < TF < J_04 (p < 0.05). Only one J_04 but all instruments of the other groups fractured within the test-limit of 10 min. (B) Mtwo was significantly inferior concerning time until fracture and NCF, compared to J_06 and HF (p < 0.05), which did not differ significantly (p > 0.05). While all Mtwo instruments fractured, only four instruments failed in the other groups (p < 0.05). Within the limitations of this study, alloy and cross-sectional design (i.e., core mass) were critical factors regarding instrument failure, but none of these factors could be determined as a main parameter for increased or decreased time, and cycles to fracture. Rather, it seemed to be the interaction of multiple factors (e.g., longitudinal and cross-sectional design, alloy, and rotational speed) that was responsible for differences in the time and cycles to fracture. Nonetheless, all instruments had lifetimes that allow safe clinical use. However, the superiority or inferiority of an instrument with regard to cyclic fatigue based on laboratory results—even when identical trajectories are guaranteed—may be considered questionable, as the characteristics and design parameters of the instruments vary considerably, and the experimental setups lack additional clinical parameters and thus clinical relevance.

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22

Yang, Guangyao, Shengbo Ye, Feng Zhang, Yicai Ji, Xiaojuan Zhang, and Guangyou Fang. "Dual-Polarized Dual-Loop Double-Slot Antipodal Tapered Slot Antenna for Ultra-Wideband Radar Applications." Electronics 10, no. 12 (June 8, 2021): 1377. http://dx.doi.org/10.3390/electronics10121377.

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The miniaturized high-gain antenna is required in portable, ultra-wideband radar systems. However, the miniaturization, ultra-wideband and high gain often restrict each other in the antenna design. In this paper, a dual-polarized, double-slot, antipodal tapered slot antenna with a double-layer, dual-loop structure and novel slot edges is presented. The proposed magnetic dual-loop structure has the capacity to reduce the low cut-off frequency of the double-slot tapered slot antenna by weakening the resonance and coupling. In addition, the high gain, low sidelobe level (SLL), and low cross-polarization level are achieved in the boresight direction. A novel gradient slot profile is designed to improve the low-frequency directivity of the tapered slot antenna without affecting the matching. To feed the antenna elements, a kind of wideband, balun-divider structure is designed. The dual-polarized antenna is combined by two orthogonal elements in a cross configuration without galvanic contact or influence to performance. The measured results show that the impedance bandwidth of the proposed antenna is 0.6~4 GHz, and the maximum gain is 11 dBi. The isolation between the two antenna ports is better than 32 dB, and the cross-polarization discrimination (XPD) is better than 20 dB.

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23

Dong, Ya Zhou, Shi Wei Dong, Zhong Bo Zhu, and Ying Wang. "Ka Band Transition between Rectangular Waveguide and Substrate Integrated Waveguide." Advanced Materials Research 443-444 (January 2012): 362–65. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.362.

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This paper presents novel designs of Ka band transitions between standard rectangular waveguide and substrate integrated waveguide (SIW). The proposed transitions can provide simultaneous field and impedance matching. The transition with a height-tapered waveguide exhibits outstanding low-loss performance over an ultra-wideband range (entire Ka-band). And the other one with Chebyshev transformers has a compact profile and low loss better than 2dB in a bandwidth of 11GHz at Ka band. The simulation and analysis of the transitions are carried out with Ansoft HFSS.

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24

Latif, Saeed I., Daniel Flores Tapia, Diego Rodriguez Herrera, Mario Solis Nepote, Stephen Pistorius, and Lotfollah Shafai. "A Directional Antenna in a Matching Liquid for Microwave Radar Imaging." International Journal of Antennas and Propagation 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/751739.

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The detailed design equations and antenna parameters for a directional antenna for breast imaging are presented in this paper. The antenna was designed so that it could be immersed in canola oil to achieve efficient coupling of the electromagnetic energy to the breast tissue. Ridges were used in the horn antenna to increase the operating bandwidth. The antenna has an exponentially tapered section for impedance matching. The double-ridged horn antenna has a wideband performance from 1.5 GHz to 5 GHz (3.75 GHz or 110% of impedance bandwidth), which is suitable for breast microwave radar imaging. The fabricated antenna was tested and compared with simulated results, and similar bandwidths were obtained. Experiments were conducted on breast phantoms using these antennas, to detect a simulated breast lesion. The reconstructed image from the experiments shows distinguishable tumor responses indicating promising results for successful breast cancer detection.

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25

Ramya and Thipparaju Rama Rao. "Penta-band linear tapered feed planar spiral antenna for vehicular communications." International Journal of Microwave and Wireless Technologies 9, no. 7 (February 13, 2017): 1523–32. http://dx.doi.org/10.1017/s175907871700006x.

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Owing to dynamic nature of vehicular environments, it becomes essential to achieve effective communication via vehicle-to-vehicle and infrastructure-to-vehicle. This leads to the need for an antenna system that supports multiple frequency bands, high gain, broadside radiation pattern, and circular polarization. We propose single-arm penta-band-based spiral antenna with dimensions of 51 × 35 × 1.574 mm3resonating at navigational wireless frequencies 1.2 GHz for IRNSS and 1.5 GHz for GPS; wireless communication frequencies 2.45 and 3.3 GHz and dedicated short range communication frequency 5.8 GHz. Linear taper feed has been introduced to achieve good impedance matching and the outer edge feed of the spiral on the same plane helps to achieve circular polarization. The measurement result proves the betterment in impedance of the spiral antenna that varies from 50 –55 Ω across the desired operating frequencies.

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26

Percaz, Jon M., Israel Arnedo, Ivan Arregui, Fernando Teberio, Petronilo Martin-Iglesias, Miguel A. G. Laso, and Txema Lopetegi. "General Synthesis of Tapered Matching Sections for Single-Mode Operation Using the Coupled-Mode Theory." IEEE Transactions on Microwave Theory and Techniques 67, no. 9 (September 2019): 3511–26. http://dx.doi.org/10.1109/tmtt.2019.2929132.

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27

Jaschke, Thomas, Hans K. Mitto, and Arne F. Jacob. "K/Ka-band dual-polarized SIW-fed lens antennas for Rx/Tx integration." International Journal of Microwave and Wireless Technologies 10, no. 5-6 (April 3, 2018): 627–34. http://dx.doi.org/10.1017/s1759078718000399.

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AbstractThis contribution deals with array elements for K/Ka-band satellite communication terminals. It proposes an end-fire design realized in substrate integrated waveguide technology and featuring dual-band functionality, and dual circular polarization. The latter is achieved by means of a dual-band orthomode transducer. An extended hemispherical dielectric lens ensures good matching and radiation properties. The feed structure is composed of a multilayer printed circuit board and tapered superstrates. The design procedure of the components is explained in detail and three different variants of the antenna are compared. The measured scattering and far-field parameters validate the concept.

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28

Lee, Kun-A., and Kwang-Cheol Ko. "Lumped-element model of a tapered transmission line for impedance matching in a pulsed power system." Journal of the Korean Physical Society 69, no. 2 (July 2016): 131–36. http://dx.doi.org/10.3938/jkps.69.131.

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29

Dong-Wook Kim. "An Output Matching Technique for a GaN Distributed Power Amplifier MMIC Using Tapered Drain Shunt Capacitors." IEEE Microwave and Wireless Components Letters 25, no. 9 (September 2015): 603–5. http://dx.doi.org/10.1109/lmwc.2015.2451351.

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30

Pramanick, P., and P. Bhartia. "A generalized theory of tapered transmission line matching transformers and asymmetric couplers supporting non-TEM modes." IEEE Transactions on Microwave Theory and Techniques 37, no. 8 (1989): 1184–91. http://dx.doi.org/10.1109/22.31077.

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31

Cogollos, Santiago, Joaquin Vague, Vicente E. Boria, and Jorge D. Martinez. "Novel Planar and Waveguide Implementations of Impedance Matching Networks Based on Tapered Lines Using Generalized Superellipses." IEEE Transactions on Microwave Theory and Techniques 66, no. 4 (April 2018): 1874–84. http://dx.doi.org/10.1109/tmtt.2018.2791952.

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32

Yuniar, R. N., T. Hariyadi, A. Saripudin, and B. Mulyanti. "Design of a compact UWB Wilkinson Power Divider using ring structured and tapered line matching transformer." IOP Conference Series: Materials Science and Engineering 850 (May 23, 2020): 012055. http://dx.doi.org/10.1088/1757-899x/850/1/012055.

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33

Ristić, Davor, Alphonse Rasoloniaina, Andrea Chiappini, Patrice Féron, Stefano Pelli, Gualtiero Nunzi Conti, Mile Ivanda, Giancarlo C. Righini, Gilles Cibiel, and Maurizio Ferrari. "About the role of phase matching between a coated microsphere and a tapered fiber: experimental study." Optics Express 21, no. 18 (August 30, 2013): 20954. http://dx.doi.org/10.1364/oe.21.020954.

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34

Mitani, Tomohiko, Ryo Nakajima, Naoki Shinohara, Yoshihiro Nozaki, Tsukasa Chikata, and Takashi Watanabe. "Development of a Microwave Irradiation Probe for a Cylindrical Applicator." Processes 7, no. 3 (March 7, 2019): 143. http://dx.doi.org/10.3390/pr7030143.

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A microwave irradiation probe was newly developed for downsizing microwave applicators and the overall microwave heating apparatus. The key component of the proposed probe is a tapered section composed of polytetrafluoroethylene (PTFE) and alumina. Insertion of the tapered section between the input port and the applicator vessel realizes impedance matching to the microwave power source and reduces the reflected power from the applicator. The proposed microwave probe for a cylindrical applicator was designed using 3D electromagnetic simulations. The permittivity data of two liquid samples—ultrapure water and 2 M NaOH solution—were measured and taken into simulations. The conductivity of the NaOH solution was estimated from the measurement results. The measured reflection ratio of the fabricated applicator was in good accordance with the simulated one. The frequency ranges in which the measured reflection ratio was less than 10% were from 1.45 GHz to 2.7 GHz when using water and from 1.6 GHz to 2.7 GHz when using the NaOH solution as the sample. The heating rate of the applicator was roughly estimated as 63 to 69 K for a 5 min interval during the 2.45 GHz microwave irradiation at the input power of 100 W.

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35

Barma, Minakshi Deb, Sumita Deb, and Ardhendu Saha. "Broadband fractional total internal reflection quasi phase matching based second harmonic generation in reverse tapered isotropic semiconductor considering the effect of nonlinear reflection." Journal of Nonlinear Optical Physics & Materials 24, no. 04 (December 2015): 1550041. http://dx.doi.org/10.1142/s0218863515500411.

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This paper analyzes a highly efficient broadband second-harmonic generator in the mid infrared region using an isotropic reverse tapered semiconductor slab configuration, using fractional total internal reflection quasi-phase matching technique. A computer aided simulation has been performed using ZnTe as the nonlinear material which provides an extremely high conversion efficiency of 22.94% with a 3[Formula: see text]dB bandwidth of 200[Formula: see text]nm. Effect of varying the slab dimensions on the performance parameters has also been analyzed. Finally, the catastrophic effect caused by destructive interference due to nonlinear law of reflection has also been incorporated in the analysis thereby giving more accurate results.

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36

Gallacher, Kevin, Paul F. Griffin, Erling Riis, Marc Sorel, and Douglas J. Paul. "Silicon nitride waveguide polarization rotator and polarization beam splitter for chip-scale atomic systems." APL Photonics 7, no. 4 (April 1, 2022): 046101. http://dx.doi.org/10.1063/5.0077738.

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The design, fabrication, and characterization of a silicon nitride waveguide polarization rotator and polarization beam splitter that operate with a polarization extinction ratio (PER) of ∼30 dB at the rubidium atomic transition of 780 nm wavelength are demonstrated. These polarization devices are fabricated on the same chip using a self-aligned process for integration of the rib and ridge waveguide structures. The polarization rotator is based on the mode evolution approach using adiabatic tapers and demonstrates a PER of ≥20 dB over a 100 nm bandwidth (730–830 nm wavelengths) with an insertion loss (IL) ≤1 dB. The polarization beam splitter is based on a cascaded tapered asymmetric directional coupler with phase matching between the fundamental and higher order TM modes, whereas the TE mode is separated by the through port. This provides a PER ≥ 20 dB with IL ≤ 1 dB over a 50 nm bandwidth for the cross port and a PER ≥ 15 dB with an IL ≤ 1 dB over an 18 nm bandwidth for the through port. These polarization control waveguide devices will enable photonic integrated circuits for saturated absorption spectroscopy of atomic vapors for laser stabilization on-chip.

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37

Aboufoul, Tamer, Akram Alomainy, and Clive Parini. "Reconfigured and Notched Tapered Slot UWB Antenna for Cognitive Radio Applications." International Journal of Antennas and Propagation 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/160219.

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A compact reconfigurable and notched ultra-wideband (UWB) tapered slot antenna (TSA) is presented. The antenna reconfiguration operation principle relies on 2 mechanisms: in the first mechanism a resonator parasitic microstrip line electrically coupled to the TSA is used to notch the TSA at a specific frequency and the second mechanism relies on changing the input impedance matching of the antenna by means of changing the length of a stub line extended from an additional tiny partial ground on the back side of the antenna. The reflection coefficient, radiation patterns, and gain simulations and measurements for the proposed antenna are presented to verify the design concepts featuring a very satisfactory performance. Total efficiency simulations and measurements are also presented to highlight the filtering performance of the reconfigured antenna. When the antenna was reconfigured from the UWB to work into multiple frequency bands, the radiation patterns were still the same and the total peak gain has slightly improved compared to the UWB case. In addition, when the antenna operated in the notched mode, the gain has significantly dropped at the notch frequency. The simplicity and flexibility of the proposed multimode antenna make it a good candidate for future cognitive radio front ends.

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38

Jia, Yanxing, Jun Wang, Qing Ge, Haijing Wang, Jiachen Li, Chunyang Xiao, Rui Ming, et al. "Monolithic integration of 1.3 μm asymmetric lasers grown on silicon and silicon waveguides with tapered coupling." Laser Physics 32, no. 9 (September 1, 2022): 096201. http://dx.doi.org/10.1088/1555-6611/ac8c41.

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Abstract We proposed a design scheme to enable the monolithic integration between a silicon waveguide and a 1.3 μm wavelength band III–V quantum dot laser, which is epitaxially grown on silicon with an asymmetric structure. The III–V laser is grown in a deep trench of a silicon-on-insulator wafer by the selective area epitaxy technique, and a GaAs coupling layer is inserted into the lower cladding layer of the laser, which can make the optical field distribution of the laser shift down. Besides, a mode-size converter with a three-segment tapered structure is designed to couple the output laser into the standard single-mode silicon waveguide. For the laser, the composition and the thickness of AlGaAs cladding layers and AlGaAs transition layer are optimized based on the optical waveguide theory. When the upper cladding layer is 0.6 μm Al0.7Ga0.3As, the lower cladding layer is 1.2 μm Al0.25Ga0.75As, and the transition layer is 20 nm Al0.45Ga0.55As, the optical confinement factors of the active region and the coupling layer are 45.34% and 40.69%, respectively. Then the length of the mode-size converter with a three-segment tapered structure is further optimized by the mode-matching method. When the lengths of the three tapered structures of the mode-size converter are 50 μm, 53 μm and 10 μm respectively, a coupling efficiency of 65% can be obtained between the laser and the Si waveguide. This scheme is expected to realize the efficient optical coupling between the silicon integrated light source and the silicon waveguide, which will promote the development of silicon monolithic photonic integration.

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Saha, Ardhendu, and Sumita Deb. "Broadband second harmonic generation in a tapered isotropic semiconductor slab using total internal reflection quasi phase matching." Optics Communications 284, no. 19 (September 2011): 4714–22. http://dx.doi.org/10.1016/j.optcom.2011.05.067.

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Saha, Ardhendu, and Sumita Deb. "Broadband second-harmonic generation in a double-tapered gallium arsenide slab using total internal reflection quasiphase matching." Optik 125, no. 23 (December 2014): 6861–66. http://dx.doi.org/10.1016/j.ijleo.2014.08.111.

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Kurisawa, Taiga, Yoshiki Kamiura, Chiemi Fujikawa, and Osamu Mikami. "Polymer tapered pillar on a fiber end fabricated by UV irradiation using a high-NA fiber." Photonics Letters of Poland 14, no. 4 (December 31, 2022): 80–82. http://dx.doi.org/10.4302/plp.v14i4.1179.

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The increasing need for single-mode fibers (SMFs) and advances in silicon photonics (SiPh) devices have led to the need for an efficient method of optical coupling between them. To achieve a higher coupling between them, a polymer tapered pillar was fabricated on the end face of the SMF by applying the optical diffraction effect and a self-written waveguide technology using a high numerical aperture (HiNA) fiber. The initial 10.4 µm spot size was reduced to 4.17 µm at 1.55 µm wavelength, and the greatest coupling efficiency of –1.01 dB was reached between an SMF with a tapered pillar and uncured resin cladding and a HiNA fiber. Full Text: PDF ReferencesR. Marchetti, C. Lacava, L. Carroll, K. Gradkowski, P. Minzioni, "Coupling strategies for silicon photonics integrated chips [Invited]", Photonics Res. 7, 201 (2019). CrossRef R. Bachelot, C. Ecoffet, D. Deloeil, P. Royer, D.-J. Lougnot, "Integration of micrometer-sized polymer elements at the end of optical fibers by free-radical photopolymerization", Appl. Opt. 40, 5860 (2001). CrossRef P. Pura, M. Szymanski, M. Dudek, L.R. Jaroszewicz, P. Marc, M. Kujawinska, "Polymer Microtips at Different Types of Optical Fibers as Functional Elements for Sensing Applications", J. Lightwave Techn. 33, 2398 (2015). CrossRef O. Mikami, R. Sato, S. Suzuki, C. Fujikawa, "Polymer Microlens on Pillar Grown From Single-Mode Fiber Core for Silicon Photonics", IEEE Photonics. Technol. Lett. 32, 399 (2020). CrossRef Y. Kamiura, T. Kurisawa, C. Fujikawa, O. Mikami, "High optical coupling efficiency of polymer microlens and pillar on single mode fiber for silicon photonics", Jpn. J. Appl. Phys. 61, SK1009 (2022). CrossRef F. Tan, H. Terasawa, O. Sugihara, A. Kawasaki, T. Yamashita, D. Inoue, M. Kagami, C. Andraud, "Two-Photon Absorption Light-Induced Self-Written Waveguide for Single-Mode Optical Interconnection", J. Lightwave Tech. 36, 2478 (2018). CrossRef H. Terasawa, O. Sugihara, "Near-Infrared Self-Written Optical Waveguides for Fiber-to-Chip Self-Coupling", J. Lightwave Technol. 39, 7472 (2021). CrossRef K. Vanmol, K. Saurav, V. Panapakkam, H. Thienpont, N. Vermeulen, J. Watté, J. Van Erps, "Mode-field Matching Down-Tapers on Single-Mode Optical Fibers for Edge Coupling Towards Generic Photonic Integrated Circuit Platforms", J. Lightwave Tech. 38, 4834 (2020). CrossRef Y. Saito, K. Shikama, T. Tsuchizawa, H. Nishi, A. Aratake, N. Sato, "Tapered Self-Written Waveguide between Silicon Photonics Chip and Standard Single-Mode Fiber", Opt. Fiber Communication Conference (OFC2020), paper W1A.2, (2020). CrossRef Y. Saito, K. Shikama, T. Tsuchizawa, N. Sato, "Tapered self-written waveguide for a silicon photonic chip I/O", Opt. Lett. 47(12), 2971 (2022). CrossRef N.A. Baharudin, C. Fujikawa, O. Mitomi, A. Suzuki, S. Taguchi, O. Mikami, S. Ambran, "Tapered Spot Size Converter by Mask-Transfer Self-Written Technology for Optical Interconnection", Photon. Technol. Lett. 29, 949 (2017). CrossRef H. Nawata, K. Ohmori, Proc. International Conference on Electronics Packaging (ICEP), paper 23 (2014) DirectLink S. J. Frisken, "Light-induced optical waveguide uptapers", Opt. Lett. 18, 1035 (1993). CrossRef Y. Obata, Y. Oyama, H. Ozawa, T. Ito, O. Mikami, T. Uchida, "Multi-array Self-written Waveguides using Photo-mask for Optical Surface Mount Technology", International Conference on Electronics Packaging (ICEP), paper 225 (2005). DirectLink P. Yin, J.R. Serafini, Z. Su, R. Shiue, E. Timurdogan, M.L. Fanto, S. Preble, "Low connector-to-connector loss through silicon photonic chips using ultra-low loss splicing of SMF-28 to high numerical aperture fibers", Opt. Expr. 27, 24188 (2019). CrossRef https://coherentinc.force.com/Coherent/UHNA3?cclcl=en_US, (18/09/2022). DirectLink

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Lu, Ming-Feng, and Yang-Tung Huang. "Design of a Photonic Crystal Tapered Coupler with Different Section Lengths Based on Multimode Interference and Mode Matching." Japanese Journal of Applied Physics 47, no. 3 (March 14, 2008): 1822–27. http://dx.doi.org/10.1143/jjap.47.1822.

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Ajala, Rasheed, and Patricia Persaud. "Ground-Motion Evaluation of Hybrid Seismic Velocity Models." Seismic Record 2, no. 3 (July 1, 2022): 186–96. http://dx.doi.org/10.1785/0320220022.

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Abstract Cost-effective strategies for enhancing seismic velocity models are an active research topic. The recently developed hybridization technique shows promise in improving models used for deterministic earthquake hazard evaluation. We augment the results of Ajala and Persaud (2021) by exploring other hybrid models generated using 13 sets of embedding parameters—taper widths and subvolumes—and summarize their effect on waveform predictions up to a minimum period of 2 s. Our results introduce the notion of compatibility as a consideration by showing that the same basin models embedded into two different regional models can produce notably different outcomes. In contrast to most of our hybrid Harvard models that produce better matching ground motions, only one of the hybrid models generated using the Southern California Earthquake Center model as a regional model gives a closer match to the waveforms. Similar results are obtained at higher frequencies; however, improvements due to hybridization are reduced. A potential explanation for these results may be the limited high spatial frequencies in the travel time tomography basin models and the >5–6 s wavefield-dominated adjoint regional models. Although the strongly tapered compatible hybrid models tend to produce better results, we find instances of improvements even with merging artifacts.

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Cheng, Yong, Jing Lu, and Can Wang. "Design of a Multiple Band Vehicle-Mounted Antenna." International Journal of Antennas and Propagation 2019 (December 16, 2019): 1–11. http://dx.doi.org/10.1155/2019/6098014.

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This paper designs a vertically polarized, horizontal, omnidirectional vehicle antenna for the mobile communication band, covering the available frequency bands of the wireless sensor network and 5G. The antenna is composed of semi-T monopole and semicone monopole, which are placed vertically on the metal plate, especially suitable for being mounted on top of a car. T-branch mainly works at low frequency, and cone branch mainly works at high frequency. The cone branch adopts tapered structure in order to improve the impedance matching of antenna and increase the bandwidth of antenna. The antenna can be miniaturized by cutting the antenna in half. The operating frequencies of the antenna are 770 MHz–1000 MHz and 1.7 GHz–3.78 GHz which can cover multiple wireless system bands, including GSM, LTE, and 5G.

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Firdaus, Afrizal Yuhanef, Yulindon Yulindon, Dwiny Meidelfi, and Meza Silvana. "The Small UWB Monopole Antenna with Stable Omnidirectional Radiation Pattern." JOIV : International Journal on Informatics Visualization 6, no. 4 (December 31, 2022): 815. http://dx.doi.org/10.30630/joiv.6.4.972.

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Ultra Wideband (UWB) technology is an unmodulated wireless digital communication system that uses an extremely short duration pulse to transmit information bit. Because of this pulse, the UWB system needs a very wide bandwidth. Federal Communication Commission (FCC) has regulated the 3.1 – 10.6 GHz frequency spectrum for UWB. Since FCC released this frequency, many research in telecommunication have been done on UWB systems. One of them is a development of an Antenna that is suitable for UWB devices. UWB antenna characteristics require FCC band, omnidirectional radiation pattern, and compact size. In order to meet these needs, an antenna with a simple structure in the form of a monopole patch antenna with a similar patch size and ground width has been designed. The antenna is built on an FR4 – epoxy substrate material, with 4.4 dielectric constant and 1.6 mm thickness. The antenna feeding structure consists of two 100 Ω and 50 Ω lines with a wideband impedance matching scheme using tapered side and tapered transformers. The antenna design and optimization processes are conducted using electromagnetic simulation software, and measurements are carried out in an anechoic chamber. Simulation and measurement results show good agreement, and the antenna can work at frequencies 3.5 - 11.3 GHz with a gain of 1.5 – 3.25 dBi and stable omnidirectional radiation patterns. The antenna has dimensions of 27 × 8 × 1.6 mm, which are smaller than the antenna reported in the last research and suitable to be applied on various UWB devices.

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Rababah, Mahmoud M., Ze Zhong C. Chen, and Li Ming Wang. "A New Approach to Five-Axis CNC Flute Grinding of Solid End-Mills." Materials Science Forum 723 (June 2012): 421–32. http://dx.doi.org/10.4028/www.scientific.net/msf.723.421.

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The traditional cutting tools grinding reveals inexact tool flutes that altered the tool strength and affect the chip evacuation capabilities. Moreover, the normal rake angles are neither exact nor varying smoothly on the rake face along the cutting edge. Adopting the rake face grinding process, the wheel shape and path are optimized using GODLIKE scheme in order to grind the tool flutes with exact helical and normal rake angles while keeping close matching to the designed flutes. A tapered ball-end mill is considered in this study due to its extensive role in five-axis sculpture surfaces machining. With this approach proposed, a simple grinding wheel replaces the complex wheels commonly used, and the deviation between the designed and the generated flutes reveals less than 4 % of the tool minor radius. Beside all, a relationship between the radial and the normal rake angles are established.

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Wu, Yanjie, Kang Ding, Bing Zhang, Jianfeng Li, Duolong Wu, and Kun Wang. "Design of a Compact UWB MIMO Antenna without Decoupling Structure." International Journal of Antennas and Propagation 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/9685029.

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A compact high isolation ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna is designed. The proposed MIMO antenna consists of a rectangular monopole antenna and a slot antenna fed by two microstrip lines, respectively. To improve the impedance matching, a circular coupling structure is designed to feed the tapered slot antenna. The parasitic resonance introduced by the ground stub helps to extend the impedance bandwidth of monopole antenna at the upper UWB band. Commonly used complex decoupling or coupling structures are eliminated that endow the proposed antenna minimized foot print, which is preferred in mobile handset. Although without decoupling structure, high isolation is obtained between two antenna elements. Simulation and measurement verify the antenna’s desirable performance, showing a broad impedance bandwidth of 3.1–10.6 GHz with |S11| < −10 dB and |S21| < −20 dB over 3.4–10.6 GHz, and |S21| < −18 dB from 3.1–3.4 GHz.

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Deb, Sumita, and Ardhendu Saha. "Highly efficient broadband second harmonic generation in a tapered zinc telluride slab using total internal reflection fractional quasi phase matching." Optik 124, no. 16 (August 2013): 2428–31. http://dx.doi.org/10.1016/j.ijleo.2012.07.046.

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Yeo, Junho, and Jong-Ig Lee. "Miniaturized Wideband Loop Antenna Using a Multiple Half-Circular-Ring-Based Loop Structure and Horizontal Slits for Terrestrial DTV and UHD TV Applications." Sensors 21, no. 9 (April 21, 2021): 2916. http://dx.doi.org/10.3390/s21092916.

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A miniaturized wideband loop antenna for terrestrial digital television (DTV) and ultra-high definition (UHD) TV applications is proposed. The original wideband loop antenna consists of a square loop, two circular sectors to connect the loop with central feed points, and a 75 ohm coplanar waveguide (CPW) feed line inserted in the lower circular sector. The straight side of the square loop is replaced with a multiple half-circular-ring-based loop structure. Horizontal slits are appended to the two circular sectors in order to further reduce the antenna size. A tapered CPW feed line is also employed in order to improve impedance matching. The experiment results show that the proposed miniaturized loop antenna operates in the 460.7–806.2 MHz frequency band for a voltage standing wave ratio less than two, which fully covers the DTV and UHD TV bands (470–771 MHz). The proposed miniaturized wideband loop antenna has a length reduction of 21.43%, compared to the original loop antenna.

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Li, Xue-Ping, Gang Xu, Chang-Jiao Duan, Ming-Rong Ma, Shui-E. Shi, and Wei Li. "Compact TSA with Anti-Spiral Shape and Lumped Resistors for UWB Applications." Micromachines 12, no. 9 (August 27, 2021): 1029. http://dx.doi.org/10.3390/mi12091029.

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A novel compact tapered-slot-fed antenna (TSA) with anti-spiral shape and lumped resistors is presented for ultra-wideband (UWB) applications. Unique coplanar waveguide (CPW) to coplanar strip (CPS) feeding structure and exponential slot are designed to ensure the continuous current propagation and good impedance matching. With a pair of anti-spiral-shaped structure loadings at the end of the antenna, the radiation performance in lower operating band can be enhanced obviously. The typical resistor loading technique is applied to improve the time domain characteristics and expand the bandwidth. The fabricated prototype of this proposed antenna with a size of 53 × 63.5 mm2 was measured to confirm simulated results. The proposed antenna has S11 less than −10 dB in the range of 1.2–9.8 GHz, and the group delay result is only 0.4 ns. These findings indicate the proposed antenna can be taken as a promising candidate in UWB communication field.

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