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Now showing items 129 - 144 of 183

  • Resonance in a spherical-circular microstrip structure with an airgap

    Kin-Lu Wong   Hong-Twu Chen  

    The resonance problem of the spherical-circular microstrip structure with an airgap between the substrate layer and the ground conducting sphere is studied by using a rigorous Green's function formulation in the spectral domain and Galerkin's moment method calculation. Complex resonant frequencies are obtained in this study, which provide the resonant frequencies and half-power bandwidth of the structure. From the numerical results, it is found that with the increasing of the airgap thickness, the half-power bandwidth of the structure is considerably increased. This improves the low-bandwidth characteristics of microstrip structures. Details of the numerical results are presented and discussed
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  • Resonant frequency of a slot-coupled cylindrical-rectangular microstrip structure

    Kin-Lu Wong   Yeong-Chin Chen  

    Abstract The resonance problem of a slot-coupled cylindrical-rectangular microstrip structure is investigated by using the exact derived Green's functions for the structure in a spectral-domain moment-method solution. The resonant frequencies of the slot-coupled microstrip structure with various curvature radii are calculated and presented. It is observed that the resonant frequency is affected by both the slot length and the curvature radius. © 1994 John Wiley & Sons, Inc.
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  • On-board small-size printed monopole antenna integrated with USB connector for penta-band WWAN mobile phone

    Kin-Lu Wong   Chih-Hua Chang  

    Abstract An on-board small-size printed two-strip monopole antenna integrated with a universal series bus (USB) connector and generating two wide operating bands to cover penta-band wireless wide area network operation in the 824–960/1710–2170 MHz bands is presented.The two strips of the antenna are respectively printed on two small no-ground portions of 15 × 25 and 15 × 15 mm2 (total size 600 mm2). In-between the two printed strips, there is a protruded ground of 15 × 10 mm2 to accommodate a USB connector, which serves as the data port of the mobile phone. Also, easy control of the antenna's two wide lower and upper bands can be achieved by respectively adjusting the longer and shorter strips of the printed monopole antenna. That is, the antenna is easy to fabricate and also easy to fine-tune in practical applications. Details of the proposed antenna are presented and discussed. The radiation characteristics of the antenna, including the specific absorption rate results with the presence of the user's head and hand, are also studied. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2523–2527, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25537
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  • Generalized transmission-line model for cylindrical-rectangular microstrip antennas

    Kin-Lu Wong   Yu-Hua Liu   Chih-Yu Huang  

    Abstract An analysis using a generalized transmission-line model (GTLM)for a probe-fed cylindrical-rectangular microstrip antenna is presented. The equivalent circuit elements for the microstrip antenna modeled as a transmission line loaded with wall admittances are derived, and the expression for the input impedance is given. Numerical results of the input impedance are calculated and presented as a function of the cylinder radius and the substrate thickness. Excellent agreement of the GTLM solutions with the experimental results is observed. © 1994 John Wiley & Sons, Inc.
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  • Analysis of dielectric-covered radiating slots in the ground plane of a microstrip line

    Kin-Lu Wong   Hsin-Cheng Su  

    Abstract The dielectric overlay effects on the impedance properties of a radiating slot in the ground plane of a microstrip line are studied by using the reciprocity theorem and a moment-method calculation. The Green's functions for the dielectric-covered microstrip line-fed radiating slot are given, and the expression for the slot impedance is shown. Numerical convergence of the moment-method calculation using, respectively, piece-wise sinusoidal basis functions and rooftop basis functions is discussed. Numerical results for the slot impedance as a function of overlay thickness and permittivity are presented and discussed. © 1994 John Wiley & Sons, Inc.
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  • Simple printed monopole slot antenna for penta-band wireless wide area network operation in the mobile handset

    Kin-Lu Wong   Po-Wei Lin   Chih-Hua Chang  

    Abstract A simple printed monopole slot antenna for penta-band wireless wide area network operation (824–960/1710–2170 MHz) in the mobile handset is presented.The monopole slot has a length of 50 mm only and is embedded close to the bottom edge of the system ground plane of the handset with a small distance of 11 mm. By adding a small-size C-shaped strip connected orthogonal to the bottom edge of the system ground plane, good excitation of the monopole slot antenna at its fundamental (0.25 wavelength) and higher-order resonant modes can be obtained. The excited resonant modes form two wide operating bands to cover the GSM850/900 operation (824–960 MHz) and GSM1800/1900/UMTS operation (1710–2170 MHz). Detailed operating principle and radiation characteristics including the specific absorption rate results of the proposed monopole slot antenna are described. Measured results of the fabricated antenna are also presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1399–1404, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26017
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  • Compact shorted patch antenna mounted above the system ground plane of a wireless device for WLAN operation

    Kin-Lu Wong   Chih-Hua Chang   Brian Chen   Sam Yang  

    Abstract A novel compact shorted patch antenna suitable to be mounted above the system ground plane of a wireless communication device is presented. With the proposed design, the antenna does not directly occupy the system ground plane, thus leaving the board space of the system ground plane or circuit board almost intact for employing the antenna. In this case, the associated components of the wireless device can still be placed on the system ground plane or circuit board under the antenna, with the performances of the antenna almost unaffected. An example of the proposed design applied to a wireless device for WLAN operation in the 2.4-GHz band (2400–2484 MHz) is demonstrated. The experimental results are presented and discussed. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 474–476, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21382
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  • Measured input impedance and mutual coupling of rectangular microstrip antennas on a cylindrical surface

    Kin-Lu Wong   Shih-Min Wang   Shyh-Yeong Ke  

    Abstract Measured input impedance and mutual coupling of cylindrical-rectangular microstrip antennas operated in the TM01 mode are presented and discussed. Results for the antennas on curved surfaces of different cylinder radii are given, and the curvature effects on the input impedance and mutual coupling are analyzed. Theoretical results calculated using a full-wave analysis are also shown for comparison with the measured data. ©1996 John Wiley & Sons, Inc.
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  • On-board 7-band WWAN/LTE antenna with small size and compact integration with nearby ground plane in the mobile phone

    Kin-Lu Wong   Ming-Fang Tu   Chun-Yih Wu   Wei-Yu Li  

    Abstract A small-size on-board 7-band WWAN/LTE antenna formed by a coupled-fed loop antenna connected with a chip-inductor-loaded strip is presented. The antenna is disposed on a small board space of 15 × 25 mm2 (375 mm2) on the system circuit board and provides two wide operating bands to respectively cover GSM850/900 (824–960 MHz) and GSM1800/1900/UMTS/LTE2300/2500 (1710–2690 MHz) for the 7-band operation in the mobile phone. The antenna's upper band is contributed by the coupled-fed loop antenna operated at its 0.5-wavelength resonant mode. The generation of the lower band is owing to the chip-inductor-loaded strip connected to the coupled-fed loop antenna to form a coupled-fed shorted monopole antenna operated at its 0.25-wavelength resonant mode. In addition, the antenna's lower and upper bands can be respectively controlled, making it easy in fine-tuning the desired operating bandwidths in practical applications. Further, the proposed antenna can be in compact integration with its nearby ground plane on the system circuit board; that is, small isolation distance between the antenna and the nearby ground plane can be achieved for the proposed antenna. This leads to efficient board space planning on the system circuit board of the mobile phone. Details of the proposed antenna are described in the article. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2847–2853, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25619
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  • Internal eight-band WWAN/LTE handset antenna using loop shorting strip and chip-capacitor-loaded feeding strip for bandwidth enhancement

    Kin-Lu Wong   Yu-Wei Chang  

    Abstract A planar inverted-F antenna (PIFA) with a loop shorting strip and a chip-capacitor-loaded feeding strip to achieve a small size yet wideband operation for eight-band WWAN/LTE operation (698˜960/1710˜2690 MHz) in the mobile handset is presented.The antenna occupies a small no-ground footprint of 15 × 35 mm2 on the main circuit board of the handset and is closely integrated with the surrounding system ground plane to achieve compact integration inside the handset. By applying the proposed shorting strip and feeding strip, a dual-resonance excitation at about 800 MHz which forms the antenna's wide lower band to cover the LTE700/GSM850/900 operation is obtained. Further, the proposed shorting strip and feeding strip lead to the generation of additional higher-order resonant modes to assist in forming a wide upper band for the antenna to cover the GSM1800/1900/UMTS/LTE2300/2500 operation. The proposed antenna also shows good radiation characteristics over the eight operating bands. The obtained SAR values of the antenna are well less than the limit of 1.6 W/kg for 1-g head tissue for practical handset applications. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1217–1222, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25983
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  • Small-size wideband monopole antenna closely coupled with a chip-inductor–loaded shorted strip for 11-band WWAN/WLAN/WiMAX operation in the slim mobile phone

    Kin-Lu Wong   Cheng-Tse Lee  

    Abstract A small-size wideband antenna suitable for the 11-band WWAN/WLAN/WiMAX operation in the slim mobile phone is presented. The wideband antenna has a simple structure and is formed by a printed monopole closely coupled with a chip-inductor-loaded shorted strip. The antenna occupies a small footprint of 15 × 20.5 mm2 (∼308 mm2) on the system circuit board and can generate two wide operating bands for the desired 11-band operation. The antenna's upper band is mainly contributed by the printed monopole and covers the GSM1800/1900/UMTS operation (1710–2170 MHz), the 2.4/5.2/5.8 GHz WLAN operation (2400–2484/5150–5350/5725–5875 MHz), and the 2.5/3.5/5.5 GHz WiMAX operation (2500–2690/3300–3800/5250–5850 MHz). The lower band is contributed by the parasitic chip-inductor-loaded shorted strip closely coupled by the printed monopole and covers the GSM850/900 operation (824–960 MHz). Further, the antenna can be disposed on the system circuit board of the mobile phone with a small thickness of 3 mm only, allowing the antenna very promising to be applied in the modern slim mobile phone. Detailed results of the proposed antenna are presented. The specific absorption rate results of the antenna, including the case with the user's hand presence, are also analyzed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:361–366, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25712
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  • [IEEE 2013 IEEE International Workshop on Electromagnetics; Applications and Student Innovation (iWEM) - Kowloon, Hong Kong, China (2013.8.1-2013.8.3)] 2013 IEEE International Workshop on Electromagnetics, Applications and Student Innovation Competition - Keynote speaker 3: Handheld communication device ground antennas: Advances and perspectives

    Kin-Lu Wong  

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  • Thin Internal GSM/DCS Patch Antenna for Mobile Phones

    Kin-Lu Wong   Yuan-Chih Lin   Chih-Hsien Wu   Chen, B.   Yang, S.  

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  • Resonance and radiation of a superstrate-loaded spherical-circular microstrip patch antenna

    Kin-Lu Wong   Sun-Fu Hsiao   Hong-Twu Chen  

    The effects of the dielectric superstrate cover on the resonance and radiation problems of a spherical-circular microstrip patch antenna are studied, using the Green's function formulation in the spectral domain and the Galerkin moment method calculation. Numerical results for the resonant frequency, half-power bandwidth, and radiation pattern of the superstrate-loaded antenna are presented. The effects of curvature on these characteristics are also shown.
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  • Design and Development of MSA agent for Rectangular and U Slotted MSA

    Aruna Rani   Ajay Kumar Gautam   Rashid A. Bhatti   Nguyên Viêt Anh   Seong-Ook Park   Jia-Yi Sze   Kin-Lu Wong   Neela Chattoraj   J. S. Roy   Vinod Kumar Singh   Zakir Ali   Fernando G. Lobo   David E. Goldberg  

    Recently; research interest has increased in the design; development; and deployment of microstrip antenna agent systems for high-level inference and surveillance in a wireless sensor network (WSN). The proposed Antenna agent systems employ migrating codes to facilitate flexible application retasking; local processing; and calculating parameters. This provides extra flexibility; as well as new capabilities to MSA. It employs the genetic Algorithm to generate various results. This provides extra flexibility as well as new capability to design Rectangular and U slotted Microstrip Antenna.The development of Rectangular & U slit loaded antenna into Algorithm design based on parameter analysis and the coding for the architecture of rectangular and U slot loaded MSA agent. The taxonomy covers low level to high level design issue and facilitate the variation in design parameters like h; fr; Ɛ r; flow; fhigh; R according to the requirement of the proposed agent. IndexTerms-Microstrip antenna; communication; dielectric constant; frequency; bandwidth; java program; algorithm;Optimization program; genetic algorithm; SHF; U slot.
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  • Bandwidth Enhancement of Circular Micro Strip Antenna using Stub

    Rajarshi Sanyal   Sekhar Rana   Sudarshan Chakravorty   Kin-Lu Wong   Chun-Yih Wu   Keng L. Wong  

    A novel circular micro strip dual band stub loaded antenna is described. The antenna is built with a dielectric constant of (?r =2. 33) with RT/5870 as the substrate material. Due to the effect of stub loading; dual frequency is produced at 1. 88 GHz and 2. 73 GHz respectively for the stub length=17 m. m. With the further increment of stub length; shifting of secondary resonant frequency is possible from 2. 88 GHz to 1. 99 GHz which further improves the percentage bandwidth using controllable dual band. The primary resonant frequency is fixed at 1. 88GHz . Throughout the entire operation and the gain also remains constant.
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