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Träfflista för sökning "WFRF:(Lau Yuk Chiu) "

Sökning: WFRF:(Lau Yuk Chiu)

  • Resultat 1-6 av 6
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1.
  • Chiu, Chi-Yuk, et al. (författare)
  • Bandwidth enhancement technique for broadside tri-modal patch antenna
  • 2020
  • Ingår i: IEEE Open Journal on Antennas and Propagation. - 2637-6431. ; 1, s. 524-533
  • Tidskriftsartikel (refereegranskat)abstract
    • A technique for enhancing the bandwidth of a broadside tri-modal patch antenna is described. The key idea of the technique is to incorporate a dual-resonance structure into the broadside tri-modal patch geometry. By increasing one edge of the tri-modal patch while decreasing its size at the opposite edge, the resulting structure can be viewed as two super-imposed Y-shaped structures of different resonant frequencies. This intuition is confirmed using characteristic mode analysis (CMA). Furthermore, guided by CMA, further modificationsenable two sets of resonant modes to be tuned for increasing the bandwidth of the tri-modal patch antenna. Importantly, the proposed bandwidth enhancement technique does not affect the desired broadside radiation patterns significantly. Therefore, it can be utilized to modify the tri-modal patch antenna withoutdegrading its potential for massive MIMO array application. Measurement results show that the technique enhances the 10 dB impedance bandwidth from 4.3% to 19.7% with the largest antenna dimension of 0.48λc, where λc is the wavelength in air at the center frequency. The design example of the proposed technique is able to cover widely used 3 GHz bands in 5G communication systems and its potential usage in massive MIMO arrays is demonstrated.
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2.
  • Chiu, Chi-Yuk, et al. (författare)
  • Co-designed 3+3 port dual-band broadside tri-modal patch antenna
  • 2021
  • Ingår i: IEEE Open Journal on Antennas and Propagation. - 2637-6431. ; 2, s. 767-777
  • Tidskriftsartikel (refereegranskat)abstract
    • A co-designed (3+3)-port antenna for dual-band operation that requires no feeding or decoupling network is proposed and verified. The antenna consists of six ports which are divided into two groups that resonate in two differentfrequency ranges. The basic radiating element is a tri-modal patch in a folded snowflake-shaped structure with the largest antenna dimension of 0.48λ1 or 0.68λ2, where λ1 and λ2 are the wavelengths in air at the center frequencies of the lower and upper operating bands, respectively. Measurement results showthat the 10 dB impedance bandwidths of the two respective bands are 19.7% and 14.4%. The proposed antenna exhibits compact, multiport, multiband and broadside radiation characteristics which are not only suitable for dual-band MIMO applications, but also for energy harvesting systems with spatial and frequency diversities, or dual-function wireless systems with simultaneousinformation and power transfer.
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3.
  • Chiu, Chi Yuk, et al. (författare)
  • The design of a trimodal broadside antenna element for compact massive MIMO arrays : Utilizing the Theory of Characteristic Modes
  • 2020
  • Ingår i: IEEE Antennas and Propagation Magazine. - 1045-9243. ; 62:6, s. 46-61
  • Tidskriftsartikel (refereegranskat)abstract
    • Massive multiple-input multiple-output (MIMO) arrays are becoming critical elements in cellular base station infrastructure. We utilize the theory of characteristic modes (TCM) to design a novel tri-modal broadside antenna element which is suitable for the construction of compact massive MIMOarrays. The proposed antenna element consists of three ports which is formed by reviewing an existing compact two-port Y-shaped patch antenna from a TCM perspective. Using this perspective the Y-shaped antenna is modified into a snowflake-shaped patch antenna and excited by three ports via capacitive coupling. The advantage of the design approach is that the size of the three-port antenna is approximately the same as a conventional dual-polarized patch antenna, hence allowing 50% more antenna elements for the same array aperture. By cutting the ground plane into a hexagonal shape, multiple of the proposed three-port canonical antennas are concatenated together to form 21- and 102-port massive MIMO arrays with all radiation patterns pointing in the broadside direction. Key performance characteristics of the massive MIMO arrays, such asthe Hermitian product of the simulated massive MIMO channel and mutual coupling, validate the effectiveness of the compact design.
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4.
  • Chiu, Chi-Yuk, et al. (författare)
  • Two-port design of Y-shaped patch using characteristic mode analysis
  • 2020
  • Ingår i: Proceedings of the 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting. - 9781728166711 - 9781728166704
  • Konferensbidrag (refereegranskat)abstract
    • The design of two antenna ports for a compact Y-shaped patch on top of a square ground plane is considered in this work. Specifically, characteristic mode analysis reveals candidate regions to locate two direct probe feeding ports to jointly excite two significant modes of the Y-shaped patch with low mutual coupling and correlation. The feed design procedure, based on both the amplitude and phase distributions of the characteristic electric near-fields, is validated in full-wave simulation with two example realizations of two-port designs.
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5.
  • Vardelle, Armelle, et al. (författare)
  • Erratum to The 2016 Thermal Spray Roadmap
  • 2017
  • Ingår i: Journal of thermal spray technology (Print). - : Springer Science and Business Media LLC. - 1059-9630 .- 1544-1016. ; 26:5, s. 985-986
  • Tidskriftsartikel (refereegranskat)
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6.
  • Vardelle, Armelle, et al. (författare)
  • The 2016 Thermal Spray Roadmap
  • 2016
  • Ingår i: Journal of thermal spray technology (Print). - : Springer Science and Business Media LLC. - 1059-9630 .- 1544-1016. ; 25:8, s. 1376-1440
  • Tidskriftsartikel (refereegranskat)abstract
    • Considerable progress has been made over the last decades in thermal spray technologies, practices and applications. However, like other technologies, they have to continuously evolve to meet new problems and market requirements. This article aims to identify the current challenges limiting the evolution of these technologies and to propose research directions and priorities to meet these challenges. It was prepared on the basis of a collection of short articles written by experts in thermal spray who were asked to present a snapshot of the current state of their specific field, give their views on current challenges faced by the field and provide some guidance as to the R&D required to meet these challenges. The article is divided in three sections that deal with the emerging thermal spray processes, coating properties and function, and biomedical, electronic, aerospace and energy generation applications. © 2016, ASM International.
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  • Resultat 1-6 av 6

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