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162 results on '"Chen, Hua-Ming"'

12. Planar inverted-L antenna with a dielectric resonator feed in a mobile device

Author

Lin, Yi-Fang, Chen, Hua-Ming, Lin, Che-Yen, and Pan, Shan-Cheng

Subjects
Antennas (Electronics) -- Design and construction, Mobile devices -- Design and construction, Dielectric resonators -- Design and construction, Business, Computers, Electronics, Electronics and electrical industries
Published
2009

13. Microstrip-fed circularly polarized square-ring patch antenna for GPS applications

Author

Chen, Hua-Ming, Wang, Yang-Kai, Lin, Yi-Fang, Lin, Che-Yen, and Pan, Shan-Cheng

Subjects
Antennas (Electronics) -- Design and construction, Global Positioning System -- Equipment and supplies, Dielectrics -- Usage, Dielectrics -- Properties, Electromagnetic waves -- Polarization, Electromagnetic waves -- Observations, Global Positioning System, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A novel coupling technique for circularly polarized square-ring patch antenna is developed and discussed. The circular polarization (CP) radiation of the square-ring patch antenna is achieved by a simple microstrip feed line through the coupling of a square patch on the same plane of the antenna. Proper positioning of the coupling square patch excites two orthogonal resonant modes with 90[degrees] phase difference, and a pure circular polarization is obtained. The dielectric material is a square block of ceramic with a permittivity of 58 and that reduces the size of the antenna. The prototype has been designed, fabricated and found to have an impedance bandwidth of 1.1% and a 3-dB axial-ratio bandwidth of about 0.03 % at GPS frequency of 1573 MHz. The characteristics of the proposed antenna have been studied by simulation software HFSS and experiments. The measured and simulated results are in good agreement. Index Terms--Ceramic dielectric material, circular polarization (CP), global position system (GPS), square-ring patch antenna.

Published
2009

15. A new coupling mechanism for circularly polarized annular-ring patch antenna

Author

Lin, Yi-Fang, Chen, Hua-Ming, and Lin, Shih-Chieh

Subjects
Antennas (Electronics) -- Design and construction, Dielectrics -- Properties, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A novel coupling technique for circularly polarized annular-ring patch antenna is developed and discussed. The circular polarization (CP) radiation of the annular-ring patch antenna is achieved by a simple microstrip feed line through the coupling of a fan-shaped patch on the same plane of the antenna. Proper positioning of the coupling fan-shaped patch excites two orthogonal resonant modes with 90[degrees] phase difference, and a pure circular polarization is obtained. The dielectric material is a cylindrical block of ceramic with a permittivity of 25 and that reduces the size of the antenna. The prototype has been designed and fabricated and found to have an impedance bandwidth of 2.3% and a 3 dB axial-ratio bandwidth of about 0.6% at the center frequency of 2700 MHz. The characteristics of the proposed antenna have been by simulation software HFSS and experiment. The measured and simulated results are in good agreement. Index Terms--Annular-ring patch antenna, ceramic dielectric material, circular polarization (CP), patch coupling.

Published
2008

27. Reliability Analysis of Prestressed Egg-shaped Digester

Author

Li, Jie, Chen, Hua-ming, Chen, Jian-bing, Motasoares, C. A., editor, Martins, J. A. C., editor, Rodrigues, H. C., editor, Ambrósio, Jorge A. C., editor, Pina, C. A. B., editor, Motasoares, C. M., editor, Pereira, E. B. R., editor, and Folgado, J., editor

Published
2006
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29. Risk‐adapted stereotactic body radiation therapy for central and ultra‐central early‐stage inoperable non‐small cell lung cancer

Author

Meng, Mao‐Bin, primary, Wang, Huan‐Huan, additional, Zaorsky, Nicholas G., additional, Sun, Bing‐Shen, additional, Zhu, Lei, additional, Song, Yong‐Chun, additional, Li, Feng‐Tong, additional, Dong, Yang, additional, Wang, Jing‐Sheng, additional, Chen, Hua‐Ming, additional, Yu, Xu‐Yao, additional, and Yuan, Zhi‐Yong, additional

Published
2019
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32. Four‐port MIMO dual‐loop antennas for 5G C‐band access point applications.

Author

Chen, Wen‐Shan, Lin, Yung‐Chi, and Chen, Hua‐Ming

Subjects
ANTENNAS (Electronics), 5G networks, BANDWIDTHS
Abstract

This paper presents a four‐port design for multiple‐input and multiple‐output (MIMO) dual‐loop antennas in 5G C‐band access point applications. The dimensions of the design are 90 mm × 90 mm × 15 mm. It consists of four dual‐loop antennas, four feed lines, and a reflector. The design uses a phase difference of 90° among the antennas to improve the isolation. It was observed that a dual‐loop antenna with another nearby dual‐loop antenna generates two modes to form the bandwidths WRC 5G C‐band (3.4‐3.6 GHz) and China 5G C‐band (3.3‐3.8 GHz). A rectangular parasitic element placed in the middle of the four dual‐loop antennas enhances the antenna gain. The proposed design has a compact size, good gain, low cost, and easy manufacturing, and is a suitable candidate for practical applications. [ABSTRACT FROM AUTHOR]

Published
2021
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35. A Compact Dual-Band Dielectric Resonator Antenna Using a Parasitic Slot

Author

Shan-Cheng Pan, Chen Hua-Ming, Yang-Kai Wang, Lin Yi-Fang, and Shih-Chieh Lin

Subjects
Physics, Dielectric resonator antenna, business.industry, Bandwidth (signal processing), computer.software_genre, Microstrip, Simulation software, Microstrip antenna, Optics, Multi-band device, Electrical and Electronic Engineering, business, computer, Parametric statistics, Ground plane
Abstract

A compact dual-band dielectric resonator antenna (DRA) using a parasitic c-slot fed by a microstrip line is proposed. In this configuration, the DR performs the functions of an effective radiator and the feeding structure of the parasitic c-slot in the ground plane. By optimizing the proposed structure parameters, the structure resonates at two different frequencies. One is from the DRA with the broadside patterns and the other from the c-slot with the dipole-like patterns. In order to determine the performance of varying design parameters on bandwidth and resonance frequency, the parametric study is carried out using simulation software High-Frequency Structure Simulator and experimental results. The measured and simulated results show excellent agreement.

Published
2009

39. Investigation of near-field S-loop antenna for RFID reader

Author

Sim Chow-Yen-Desmond, Chen Chien-Hung, Liao Chia-Te, and Chen Hua-Ming

Subjects
Loop antenna, Computer science, business.industry, Antenna measurement, Electrical engineering, Antenna rotator, Antenna tuner, law.invention, Hardware_GENERAL, law, Electronic engineering, Dipole antenna, Antenna (radio), Omnidirectional antenna, business, Monopole antenna
Abstract

A developing innovative technology of dual S-loop antenna is proposed for near-field operations in the Ultra-High Frequency Band. The UHF RFID reader antenna can be generated a strong and uniform electromagnetic field in a near-field zone of the dual-loop. The proposed full wave dual loop antenna is suitable for handheld radio frequency identification reader, especially for water applications in the food-production chain. The reader achieved a long transmission range with a compact size and practical scientific application.

Published
2015

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