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Kinlu Wong - One of the best experts on this subject based on the ideXlab platform.
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small size hybrid loop open Slot Antenna for the lte smartphone
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Kinlu Wong, Yuchen ChenAbstract:A small-size hybrid loop/open-Slot Antenna for the LTE smartphone is presented. The Antenna is disposed in a small notch of $7 \times 40\;\text{mm}^{2}$ in the system ground plane of the smartphone and has a thickness of 5.8 mm to be capable of embedding within most modern smartphones. The Antenna mainly comprises a capacitively fed loop Antenna and a ground strip embedded therein to create an open-Slot Antenna so as to generate additional resonant modes for bandwidth enhancement. The Antenna can provide two wide operating bands to cover the LTE low band (698–960 MHz) and the LTE middle/high bands (1710–2690/3400–3800 MHz). In this study, the creation of the open-Slot Antenna using a ground strip embedded in the ground clearance region for the coupled-fed loop Antenna is addressed. The proposed Antenna is also fabricated and tested. Both the simulation study and the experimental results are presented.
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internal multiband printed folded Slot Antenna for mobile phone application
Microwave and Optical Technology Letters, 2007Co-Authors: Kinlu Wong, Yunwen ChiAbstract:A novel printed folded Slot Antenna suitable for GSM/DCS/PCS/UMTS multiband operation in the mobile phone is presented. The proposed Slot Antenna has a planar configuration and is easy to fabricate by printing on the system circuit board of the mobile phone. The Slot Antenna has a length of 106 mm and is folded into a compact structure with its two Slot ends facing toward each other. This configuration allows the Antenna to occupy a small area of 21 × 45 mm2 centered on the top portion of the system ground plane. By feeding the Slot Antenna using a 50 Ω microstrip line printed along the centerline of the system ground plane, two wide bands (the half- and one-wavelength modes) of the Antenna can be generated, with the lower band covering GSM operation and the upper band covering DSC/PCS/UMTS operation. In addition, small excited surface currents in the system ground plane are observed, and the Antenna's two operating bands are in general not sensitive to the ground-plane length variations. These features are attractive for practical applications and different from those of the conventional internal mobile phone Antennas. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1833–1837, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22602
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a broad band cpw fed strip loaded square Slot Antenna
IEEE Transactions on Antennas and Propagation, 2003Co-Authors: Jyhying Chiou, Jiayi Sze, Kinlu WongAbstract:A novel broadband design of a coplanar waveguide fed square Slot Antenna loaded with conducting strips is proposed and experimentally studied. The obtained results show that the impedance bandwidth, determined by 10-dB return loss, of the proposed Slot Antenna can be greater than 60%. The design considerations for achieving broad-band operation of the proposed Slot Antenna are described, and experimental results are presented.
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stripline fed printed square spiral Slot Antenna for circular polarisation
Electronics Letters, 1998Co-Authors: Chihyu Huang, Kinlu WongAbstract:A novel design for a circularly-polarised printed square spiral Slot Antenna with a stripline feed is demonstrated. The printed Slot Antenna consists of a square spiral Slot of /spl sim/1.25 turns, and a total Slot length of approximately one free-space operating wavelength. By carefully trimming both ends of the square spiral Slot, circular polarisation (CP) operation with a wide operating bandwidth can easily be achieved. A CP bandwidth of >6% has been obtained.
Kamal Sarabandi - One of the best experts on this subject based on the ideXlab platform.
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A compact millimeter-wave Slot Antenna array for 5G standards
Antennas and Propagation (APCAP), 2015 IEEE 4th Asia-Pacific Conference on, 2015Co-Authors: Ali T. Alreshaid, Oualid Hammi, Mohammad Said Sharawi, Kamal SarabandiAbstract:A millimeter wave (mm-wave) two-dimensional Slot Antenna array, operating at 28 GHz, is designed and presented in this paper. The Antenna array consists of 8 elements in a 2??4 configuration. A 1-to-4 power divider is feeding the 2??4 Slot Antenna array in both schemes; parallel and series. The bandwidth achieved for the integrated system was almost 5% with a center frequency at 28.2 GHz. The occupied size was 29.9??28.7??0.13 mm3, making it easier to fit within handheld devices for the upcoming 5G cellular standards.
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A varactor-tuned dual-band Slot Antenna
IEEE Transactions on Antennas and Propagation, 2006Co-Authors: Nader Behdad, Kamal SarabandiAbstract:A new technique for designing dual-band reconfigurable Slot Antennas is introduced. The technique is based on loading a Slot Antenna with a lumped capacitor (or varactor) at a certain location along the Slot. Given a fixed capacitor location along the Slot, decreasing the capacitance results in increasing the first and second resonant frequencies of the Slot Antenna. However, the changes in the resonant frequencies are significantly different for the first and second resonances and, hence, a dual-band Antenna with considerable frequency ratio tuning range can be obtained. Based on this technique, an electronically tunable dual-band Antenna with a frequency ratio in the range of 1.2-1.65 is designed and fabricated using a single varactor with a capacitance range of 0.5-2.2 pF. The Antenna has similar radiation patterns with low cross-polarization levels at both bands and across the entire tunable frequency range.
Chien-jen Wang - One of the best experts on this subject based on the ideXlab platform.
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Modeling of Stepped-Impedance Slot Antenna
IEEE Transactions on Antennas and Propagation, 2014Co-Authors: Chien-jen Wang, Ling-ting ChenAbstract:In this study, the resonant analysis and modeling of the microstrip-fed stepped-impedance (SI) Slot Antenna are presented by utilizing the transmission-line and lumped-element circuit topologies. This study analyzes the SI-Slot Antenna and systematically summarizes its frequency response characteristics, such as the resonance condition, spurious response, and equivalent circuit. Design formulas with respect to the impedance ratio of the SI Slot Antenna were analytically derived. The Antenna designers can predict the resonant modes of the SI Slot Antenna without utilizing expensive EM-simulation software.
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Analysis of stepped-impedance Slot Antenna
2014 International Symposium on Antennas and Propagation Conference Proceedings, 2014Co-Authors: Yu-wei Cheng, Ling-ting Chen, Chien-jen WangAbstract:The design procedure of the microstrip-fed stepped-impedance (SI) Slot Antenna has been derived by utilizing the transmission-line and lumped-element circuit topologies. The resonant analysis and modeling of the Antenna are also included. This study does not only analyze the SI-Slot Antenna, but also systematically summarizes its frequency response characteristics, including the resonance condition and spurious response. The design formulas with respect to the impedance ratio of the SI Slot Antenna are analytically derived. Note that the resonant modes of the SI-Slot Antenna are predicted without utilizing expensive EM simulation software.
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A unidirectionally radiating monopole Slot Antenna
2011 International Workshop on Antenna Technology (iWAT), 2011Co-Authors: Tz-hsiung Lin, Te-liang Sun, Chien-jen WangAbstract:A wideband planar Antenna with unidirectional characteristics is demonstrated based on the monopole Slot Antenna. By utilizing a stub-protruded feedline and adding two symmetrical stubs at the Slot edge, the impedance-matching condition is improved. The resonance frequency of the monopole Slot Antenna is significantly shifted down, and the impedance bandwidth is enlarged. By changing the width of the ground plane, connecting one metallic finger at the upper right corner, and etching two asymmetrical slits in the ground plane as reflectors, the radiation directivity of the monopole Slot Antenna can be enhanced. The proposed Antenna achieves a measured 97.4 % bandwidth for S 11 < −10 dB at the center frequency of 2.31 GHz, better than 10 dB front-to-back ratio.
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A dual broadband dual Slot Antenna
2007 IEEE Antennas and Propagation Society International Symposium, 2007Co-Authors: Su-wei Chang, Chien-jen WangAbstract:In this paper, two types of the Slot Antenna were designed, fabricated, and measured. We used several technical methods to perform the impedance characteristics, control the operating frequency of resonances, enhance the impedance bandwidth at the resonances and miniaturize the size of the microstrip-fed Slot Antenna at the 2.4 GHz and 5 GHz (the industrial-scientific-medical (ISM) bands and the Hiperlan2) bands. The Slot Antenna was fabricated by changing the radiation element from the rectangular Slot to the Z-like Slot, adding four symmetrical tuning stubs at the Slot edges, and splitting the Slot into a double Slot. The obtained impedance bandwidths for two operating bands can reach about 16.07 % for the 2.4 GHz band and 20.59 % for the 5 GHz band. The simulated and the measured radiation patterns of the double Z-like Slot Antenna were shown.
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experimental studies of a miniaturized cpw fed Slot Antenna with the dual frequency operation
IEEE Antennas and Wireless Propagation Letters, 2003Co-Authors: Chien-jen Wang, Reybin HuangAbstract:Several practical techniques have been employed to modify the operating frequency, enhance the bandwidth and miniaturize the Antenna size for a small coplanar waveguide (CPW)-fed Slot Antenna at 2.4 and 5.2 GHz, the industrial-scientific-medical (ISM) bands. These techniques include: utilizing an E-like feeding structure instead of the conventional T-shaped one; adding a matching stub at the Slot edge; adding four floating patches on the bottom plane of the substrate. In experiments, the -10 dB bandwidths achieved were 220 and 600 MHz at 2.4 and 5.2 GHz, respectively. The proposed CPW-fed Slot Antenna not only creates the dual resonant frequency bands, but the Antenna size is also reduced to approximately 60% of the traditional Slot Antenna. The E- and H-plane radiation patterns of the proposed CPW-fed Slot Antenna were measured at 2.45 and 5.2 GHz.
Ling-ting Chen - One of the best experts on this subject based on the ideXlab platform.
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Modeling of Stepped-Impedance Slot Antenna
IEEE Transactions on Antennas and Propagation, 2014Co-Authors: Chien-jen Wang, Ling-ting ChenAbstract:In this study, the resonant analysis and modeling of the microstrip-fed stepped-impedance (SI) Slot Antenna are presented by utilizing the transmission-line and lumped-element circuit topologies. This study analyzes the SI-Slot Antenna and systematically summarizes its frequency response characteristics, such as the resonance condition, spurious response, and equivalent circuit. Design formulas with respect to the impedance ratio of the SI Slot Antenna were analytically derived. The Antenna designers can predict the resonant modes of the SI Slot Antenna without utilizing expensive EM-simulation software.
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Analysis of stepped-impedance Slot Antenna
2014 International Symposium on Antennas and Propagation Conference Proceedings, 2014Co-Authors: Yu-wei Cheng, Ling-ting Chen, Chien-jen WangAbstract:The design procedure of the microstrip-fed stepped-impedance (SI) Slot Antenna has been derived by utilizing the transmission-line and lumped-element circuit topologies. The resonant analysis and modeling of the Antenna are also included. This study does not only analyze the SI-Slot Antenna, but also systematically summarizes its frequency response characteristics, including the resonance condition and spurious response. The design formulas with respect to the impedance ratio of the SI Slot Antenna are analytically derived. Note that the resonant modes of the SI-Slot Antenna are predicted without utilizing expensive EM simulation software.
Youngje Sung - One of the best experts on this subject based on the ideXlab platform.
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Size reduction technique for Slot Antenna
Electronics Letters, 2013Co-Authors: Youngje SungAbstract:A novel ground plane with a meander line is proposed for the design of a compact Slot Antenna. By using this new design, size reduction for the Slot Antenna can be realised. By embedding a meander line into the ground plane of the Slot, it is observed that the resonant frequency of the Slot Antenna significantly decreases, which can lead to a large size reduction for fixed-frequency operation. In this case, the measured bandwidth of the proposed Antenna is comparable with that of the reference Antenna.
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bandwidth enhancement of a microstrip line fed printed wide Slot Antenna with a parasitic center patch
IEEE Transactions on Antennas and Propagation, 2012Co-Authors: Youngje SungAbstract:A printed wide-Slot Antenna with a parasitic patch for bandwidth enhancement is proposed and experimentally investigated. A simple 50-Ω microstrip line is used to excite the Slot. A rotated square Slot resonator is considered as reference geometry. The rotated square Slot Antenna exhibits two resonances (f1 : lower resonant frequency, f2: higher resonant frequency). By embedding a parasitic patch into the center of the rotated square Slot, the lower resonant frequency is decreased and the higher resonant frequency is increased. Thus, broadband characteristic of the wide-Slot Antenna is achieved. The measured results demonstrate that this structure exhibits a wide impedance bandwidth, which is over 80% for |S11| ≤ -10 dB ranging from 2.23 to 5.35 GHz. Also, a stable and omnidirectional radiation pattern is observed within the operating bandwidth. In this design, a smaller ground plane is considered compared to the reference Antenna (rotated square Slot Antenna without the parasitic center patch).
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Compact microstrip arrow-shaped Slot Antenna
2009 IEEE Antennas and Propagation Society International Symposium, 2009Co-Authors: Youngje SungAbstract:A compact microstrip Slot Antenna is proposed. It presents the very small size of 0.19 λ g × 0.19 λ g at the resonant frequency of 1.37 GHz, which represents a size reduction of 48 % compared with a conventional microstrip Slot Antenna. The proposed Antenna exhibits a gain of 1.6 dBi.
