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498 results on '"Sim, Chow-Yen-Desmond"'

1. Introduction to the Flexible and Transparent Antennas

Author

Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, Dhasarathan, Vigneswaran, Chlamtac, Imrich, Series Editor, Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, and Dhasarathan, Vigneswaran

Published
2024
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2. Flexible 4-Port CP MIMO Antenna

Author

Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, Dhasarathan, Vigneswaran, Chlamtac, Imrich, Series Editor, Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, and Dhasarathan, Vigneswaran

Published
2024
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3. Flexible, Transparent, and Wideband 4-Port MIMO Antenna

Author

Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, Dhasarathan, Vigneswaran, Chlamtac, Imrich, Series Editor, Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, and Dhasarathan, Vigneswaran

Published
2024
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4. UWB Flexible Antenna

Author

Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, Dhasarathan, Vigneswaran, Chlamtac, Imrich, Series Editor, Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, and Dhasarathan, Vigneswaran

Published
2024
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5. Advancements in Flexible MIMO Antennas for 5G Smartphones

Author

Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, Dhasarathan, Vigneswaran, Chlamtac, Imrich, Series Editor, Kulkarni, Jayshri, Desai, Arpan, Tung Hsu, Heng, Garner, Brian, Li, Yang, Sim, Chow-Yen-Desmond, and Dhasarathan, Vigneswaran

Published
2024
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6. Multi Band Cactus Shaped Monopole MIMO Antenna for Wireless LAN and X Band Satellite Communication Applications

Author

Kulkarni, Jayshri, Kulkarni, Shailesh, Sim, Chow-Yen-Desmond, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tiwari, Manish, editor, Ismail, Yaseera, editor, Verma, Karan, editor, and Garg, Amit Kumar, editor

Published
2023
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7. Multi Band Inter Connected C-Shaped Flexible Antenna for Mobile and Fixed Wireless Communication Systems

Author

Kulkarni, Jayshri, Sim, Chow-Yen-Desmond, Poddar, Ajay, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tiwari, Manish, editor, Ismail, Yaseera, editor, Verma, Karan, editor, and Garg, Amit Kumar, editor

Published
2023
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14. Design and Implementation of Automatic Following Technology for Mobile Devices

Author

Tsai, Ming-Fong, Chen, Chi-Feng, Sim, Chow-Yen-Desmond, Li, Chih-Sheng, Chen, Lien-Wu, Akan, Ozgur, Editorial Board Member, Bellavista, Paolo, Editorial Board Member, Cao, Jiannong, Editorial Board Member, Coulson, Geoffrey, Editorial Board Member, Dressler, Falko, Editorial Board Member, Ferrari, Domenico, Editorial Board Member, Gerla, Mario, Editorial Board Member, Kobayashi, Hisashi, Editorial Board Member, Palazzo, Sergio, Editorial Board Member, Sahni, Sartaj, Editorial Board Member, Shen, Xuemin (Sherman), Editorial Board Member, Stan, Mircea, Editorial Board Member, Jia, Xiaohua, Editorial Board Member, Zomaya, Albert Y., Editorial Board Member, Deng, Der-Jiunn, editor, Pang, Ai-Chun, editor, and Lin, Chun-Cheng, editor

Published
2020
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19. Intelligent Trashcan Applications Relying on Internet of Things Technologies

Author

Kiong, Ye Chin, Sim, Chow-Yen-Desmond, Sinn, Ang, Tsai, Ming-Fong, Chen, Lien-Wu, Akan, Ozgur, Series Editor, Bellavista, Paolo, Series Editor, Cao, Jiannong, Series Editor, Coulson, Geoffrey, Series Editor, Dressler, Falko, Series Editor, Ferrari, Domenico, Series Editor, Gerla, Mario, Series Editor, Kobayashi, Hisashi, Series Editor, Palazzo, Sergio, Series Editor, Sahni, Sartaj, Series Editor, Shen, Xuemin (Sherman), Series Editor, Stan, Mircea, Series Editor, Xiaohua, Jia, Series Editor, Zomaya, Albert Y., Series Editor, Lin, Yi-Bing, editor, Deng, Der-Jiunn, editor, You, Ilsun, editor, and Lin, Chun-Cheng, editor

Published
2018
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20. An Aperture-Shared Vehicular Antenna With Large Frequency Ratio and Pattern Diversity for Future 5G Millimeter-Wave and DSRC Applications

Author

Feng, Botao, Li, Haoming, Rao, Liwei, Ding, Xiao, Sim, Chow-Yen-Desmond, and Chung, Kwok L.

Abstract

A vehicular antenna with diverse radiation patterns is proposed for both the dedicated short range communications (DSRC) and the fifth-generation (5G) millimeter-wave (MMW) communications. The proposed antenna mainly comprised a 2 × 2 MMW subarray, an 8-element DSRC subarray and a corresponding 5-port feeding network. The radiating patches of the MMW subarray are excited by two pairs of coaxial-to-substrate integrated waveguide (SIW) transition (CST) feeding networks that are comprised of two 3-dB couplers, two 90$^{\circ }$-phase shifters, and four power dividers (PDs), which provide in-phase and differential-phase output signals to achieve single-beam and conical-beam radiation patterns. On the other hand, the 8 monopoles of the DSRC subarray arranged around the aforementioned MMW radiator are excited by a coaxial-to-SIW-to-coaxial transition (CSCT) feeding network that includes a 1-to-4 SIW PD and four 1-to-2 microstrip PDs to form an omni-directional radiation and achieve a large frequency ratio (LFR). Measured results indicate that wide bandwidths of 15.44% (24.14-28.18 GHz), 16.09% (24.29-28.54 GHz), 15.01% (23.85-27.72 GHz), and 14.29% (24.05-27.75 GHz) with corresponding high peak gains of 10.97$\pm$1.03 dBi, 11.71$\pm$1.32 dBi, 10.84$\pm$1.00 dBi, and 11.29$\pm$1.28 dBi are obtained by the four MMW subarray ports, while a bandwidth of 11.40% (5.46-6.12 GHz) with an azimuth-plane gain of 0.64 dBi and a peak gain of 4.29$\pm$0.19 dBi for the DSRC subarray port are also obtained. Besides, low cross-polarization (X-pol) levels of −24 dB and −27 dB are achieved for the two subarrays, respectively.

Published
2024
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25. Wideband Low-Profile Endfire Antenna With Polarization Reconfigurability

Author

Jaiswal, Rahul Kumar, Aakash, Ojha, Anuj Kumar, Sim, Chow-Yen-Desmond, and Srivastava, Kumar Vaibhav

Abstract

A wideband, low-profile endfire antenna with polarization reconfiguration is proposed. The endfire antenna can be electronically switched among the left-hand circular polarization (LHCP), right-hand circular polarization (RHCP), and linear polarization (LP) using six PIN diodes in conjunction with biasing lines. The proposed antenna consists of a wideband half-mode substrate integrated waveguide (HMSIW) cavity (vertically polarized magnetic dipole) and tapered switchable electric dipole (horizontally polarized) with a feed line. The impedance bandwidth of the HMSIW cavity is increased by combining the resonance frequencies of quasi-TE1,0.5,0 mode with quasi-TE3,0.5,0 mode by placing the two slotted pairs at the null of quasi-TE3,0.5,0 mode. At LHCP/RHCP states, the proposed endfire antenna exhibited a stacked 10-dB impedance bandwidth (IBW) of 11.66% (6.54-7.35 GHz) and a 3-dB axial ratio bandwidth (ARBW) of 11.23% (6.515-7.29 GHz) with a peak gain of approximately 4.20 dBic. When switched to the LP state, it shows a 10-dB impedance bandwidth of 11.58% (6.87-7.715 GHz) with a peak gain of 5.35 dBi. Therefore, it can exhibit good effective bandwidths (stacked 10-dB IBW and 3-dB ARBW) of 5.93% (6.87-7.29 GHz) and 10.84% (6.54-7.29 GHz) across the three polarization states (LP/RHCP/LHCP) and two CP states (RHCP/LHCP), respectively.

Published
2024
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26. The propagation of VHF and UHF radio waves over sea paths

Author

Sim, Chow Yen Desmond, Warrington, E. M., and Stocker, A.

Subjects
621.38411
Abstract

This thesis is concerned with the statistical studies of VHF/UHF radio wave propagation over the sea path at the limits of line-of-sight range. The objective is to provide a set of data that leads to the understanding of the characteristic of VHF/UHF radio wave over the sea path. A series of experiments were conducted using two paths of around 33 and 48 km across the English Channel. These two paths are between fixed land-based locations that provide an unobstructed condition. This allows a prolonged period of data collection under several sea states and atmospheric conditions without the heavy expenses of ship borne trial. The statistic studies showed that the high signal strength variation observed at both receiving sites are the results due to ducting and super-refraction. It occurred around 43 to 76% and 31 to 48% of the total time (percentage of days) during summer 2001 and 2002 respectively. In comparison, the total time was below 10% during winter period. Across the Jersey-Alderney path (48 km), high fading phenomenon was observed which is a result due to interference fading between the diffracted and troposcattered signal. The statistics showed that it occurred at around 35 to 55% of the total times during summer with an average fading range of around 10 and 7 dB during autumn and summer respectively, with an average fading period of around 7 seconds. The results from simulation showed that when the VHF/UHF signal reaches the radio horizon, the dominant propagating mechanism is smooth earth diffraction. Beyond the radio horizon, the attenuation rate increases dramatically and at a certain distance (depending on the frequency, antenna height and seasonal condition), the diffracted signals will be weaken and the troposcatter effect will become the dominant propagating mechanism.

Published
2002

43. A Linear Decreasing Inertia Weight Particle Swarm Optimization Base on a K-means Clustering Chaotic Sampling for Antenna Design

Author

Qin, Peng-Fei, Li, Wen-Hao, Wang, Dong, Huang, Guan-Long, Fan, Wei, and Sim, Chow-Yen-Desmond

Subjects
Sampling methods, Wireless communication, Microstrip antennas, Computational modeling, Optimization methods, Costs, Patch antennas
Abstract

This paper presents a $K$-means clustering chaotic sampling linear decreasing inertia weight particle swarm optimization (KCS-LDIWPSO) method for antenna fast design application. In this proposed method, a $K$-means clustering chaotic sampling method is used to obtain the initial particle swarm. The linear decreasing inertia weight particle swarm optimization method updates the particles to improve the optimization capability of the particle swarm optimization method. The proposed method is verified through optimization of a slotted patch antenna. The results show that the proposed method finds a required antenna with less simulation cost and computational time than other optimization methods.

Published
2022

44. A Simply-Constructed Wideband Onmidirectional Antenna for 2/3/4/5G Application

Author

Zhang, Zhong-Qi, Chen, Min, Li, Xiao-Dong, Liu, Hao-Lei, Huang, Guan-Long, Fan, Wei, and Sim, Chow-Yen-Desmond

Subjects
Broadband antennas, 3G mobile communication, Omnidirectional antennas, 5G mobile communication, Wireless communication, Dipole antennas, Antenna feeds
Abstract

A compact wideband omnidirectional antenna that can cover frequency range from 0.8 GHz to 4.0 GHz is proposed in this paper, which can be adapted to 2G, 3G, 4G and 5G frequency bands. The proposed antenna is designed according to dipole structure but having excitation at one edge of the antenna via a tapering feeding line. Moreover, the antenna is purposely placed on a ABS shell to evaluate its radiation performance in practical application environment.

Published
2022

46. Fringing Aperture Modulation of Transverse Electric Mode Excited Microstrip Antenna for Wireless Underground Sensor Networks

Author

Annavarapu, Sarath Kumar, Ghosh, Abhijyoti, Singh, Lourembam Lolit Kumar, Chattopadhyay, Sudipta, and Sim, Chow-Yen-Desmond

Abstract

In the present era, the key challenge for a low-frequency planar antenna applied to a wireless underground sensor network (WUSN) and other underground wireless communication is to achieve positive gain with good efficiency. Besides that, a relatively wider bandwidth with more than one operating frequency is desirable for operational versatility. In this work, a simple artificial magnetic conductor (AMC)-integrated rectangular microstrip antenna (RMA) of size $0.28\lambda _{0} \times 0.28\lambda _{0} \times 0.07\lambda _{0}$ is employed. By meticulously exploiting a dual-periodic AMC along with dielectric strips (AMC radiating patch and AMC ground plane) and proper utilization of an L-probe feed, two resonances at 572 MHz (low band) and 768 MHz (high band) can be yielded with a wide bandwidth of around 12%. Unlike the classical RMA design, a transverse electric (TE) mode excited RMA is proposed. The proposed antenna can also achieve good positive gains of 4.3 dBi (572 MHz) and 6.1 dBi (768 MHz) across both bands with an efficiency of 71% and 75%, respectively.

Published
2023
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