The Experts below are selected from a list of 10854 Experts worldwide ranked by ideXlab platform
Zhi Ning Chen - One of the best experts on this subject based on the ideXlab platform.
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A zero-phase-shift line (ZPSL) grid Loop Antenna with enhanced magnetic field distribution
2016 IEEE 5th Asia-Pacific Conference on Antennas and Propagation (APCAP), 2016Co-Authors: Yunjia Zeng, Zhi Ning Chen, Xianming QingAbstract:In this paper, a zero-phase-shift line (ZPSL) grid Loop Antenna is proposed to enhance the magnetic field distribution over a large interrogation zone for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications. A new type of ZPSL structure is presented to achieve a small phase lag along the Loop Antenna. The measured results show that the proposed ZPSL grid Loop Antenna achieves impedance matching over a frequency range of 900-1000 MHz with a reflection coefficient smaller than -10 dB, and produces a uniform magnetic field distribution within a large interrogation zone of 200×200 mm2.
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electrically large dual Loop Antenna for uhf near field rfid reader
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Xianming Qing, Zhi Ning ChenAbstract:An electrically large dual-Loop Antenna is proposed for ultra high frequency (UHF) near-field radio frequency identification (RFID) readers. The proposed Antenna is composed of a main Loop and a parasitic Loop wherein the Loops are constructed using segmented lines with distributed capacitors. The parasitic Loop enhances and uniforms the magnetic field distribution in the central portion of the larger main Loop so that the perimeter of interrogation zone of the dual-Loop Antenna can be extended up to three operating wavelengths. The measurement shows that a dual-Loop Antenna prototype printed onto a piece of FR4 printed circuit board (PCB) achieves good impedance matching over the frequency range of 845-928 MHz and produces strong and uniform magnetic field distribution with an interrogation zone of 250 mm 250 mm. A parametric study is carried out to provide the guidelines for the Antenna design.
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Horizontally polarized omnidirectional segmented Loop Antenna
2012 6th European Conference on Antennas and Propagation (EUCAP), 2012Co-Authors: Xianming Qing, Zhi Ning ChenAbstract:A horizontally polarized omnidirectional Loop Antenna using segmented line configuration is proposed. The utilization of the coupled line section to configure the segmented Loop Antenna makes the current along the Loop Antenna keeping in phase and flowing in a single direction. Therefore, the Antenna produces horizontally polarized omnidirectional radiation. The Antenna prototype printed onto an FR4 printed circuit board (PCB) with overall size of 50 mm × 50 mm × 0.5 mm shows desirable performance over the frequency range of 2.35-2.55 GHz: return loss of larger than 10-dB, maximum gain of 2 dBi, and omnidirectivity of less than ± 2 dB.
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A cavity backed UHF near-field segmented Loop Antenna
Antennas and Propagation (APCAP), 2012 IEEE Asia-Pacific Conference on, 2012Co-Authors: Jin Shi, Xianming Qing, Zhi Ning ChenAbstract:A cavity backed segmented Loop Antenna is proposed for ultra high frequency (UHF) near-field radio frequency identification (RFID) readers. The induced current along the cavity edges shows significant effect on the impedance matching and magnetic field distribution of the segmented Loop Antenna. A backed cavity with optimized dimensions enables the Antenna generating stronger magnetic field so that the reading range is enhanced. The reading range of an Antenna prototype with a cavity of optimized dimensions of 234 mm × 234 mm × 51 mm is increased by 7 mm compared to that of the segmented Loop Antenna without any cavity.
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Loop Antenna for uhf near field rfid reader
European Conference on Antennas and Propagation, 2010Co-Authors: Zhi Ning Chen, Xianming QingAbstract:A Loop Antenna with phase shifters is proposed for ultra-high frequency (UHF) near-field radio frequency identification (RFID) readers. Using stub phase shifters, the solid-line Loop Antenna is capable of generating strong and uniform magnetic field in a near-field zone even though the perimeter of the Loop is electrically large. Based on this design concept, a square Loop Antenna with a perimeter of two wavelengths at 915 MHz is prototyped and exhibits 100% reading rate with the reading range up to 24 mm.
Xianming Qing - One of the best experts on this subject based on the ideXlab platform.
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A zero-phase-shift line (ZPSL) grid Loop Antenna with enhanced magnetic field distribution
2016 IEEE 5th Asia-Pacific Conference on Antennas and Propagation (APCAP), 2016Co-Authors: Yunjia Zeng, Zhi Ning Chen, Xianming QingAbstract:In this paper, a zero-phase-shift line (ZPSL) grid Loop Antenna is proposed to enhance the magnetic field distribution over a large interrogation zone for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications. A new type of ZPSL structure is presented to achieve a small phase lag along the Loop Antenna. The measured results show that the proposed ZPSL grid Loop Antenna achieves impedance matching over a frequency range of 900-1000 MHz with a reflection coefficient smaller than -10 dB, and produces a uniform magnetic field distribution within a large interrogation zone of 200×200 mm2.
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electrically large dual Loop Antenna for uhf near field rfid reader
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Xianming Qing, Zhi Ning ChenAbstract:An electrically large dual-Loop Antenna is proposed for ultra high frequency (UHF) near-field radio frequency identification (RFID) readers. The proposed Antenna is composed of a main Loop and a parasitic Loop wherein the Loops are constructed using segmented lines with distributed capacitors. The parasitic Loop enhances and uniforms the magnetic field distribution in the central portion of the larger main Loop so that the perimeter of interrogation zone of the dual-Loop Antenna can be extended up to three operating wavelengths. The measurement shows that a dual-Loop Antenna prototype printed onto a piece of FR4 printed circuit board (PCB) achieves good impedance matching over the frequency range of 845-928 MHz and produces strong and uniform magnetic field distribution with an interrogation zone of 250 mm 250 mm. A parametric study is carried out to provide the guidelines for the Antenna design.
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Horizontally polarized omnidirectional segmented Loop Antenna
2012 6th European Conference on Antennas and Propagation (EUCAP), 2012Co-Authors: Xianming Qing, Zhi Ning ChenAbstract:A horizontally polarized omnidirectional Loop Antenna using segmented line configuration is proposed. The utilization of the coupled line section to configure the segmented Loop Antenna makes the current along the Loop Antenna keeping in phase and flowing in a single direction. Therefore, the Antenna produces horizontally polarized omnidirectional radiation. The Antenna prototype printed onto an FR4 printed circuit board (PCB) with overall size of 50 mm × 50 mm × 0.5 mm shows desirable performance over the frequency range of 2.35-2.55 GHz: return loss of larger than 10-dB, maximum gain of 2 dBi, and omnidirectivity of less than ± 2 dB.
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A cavity backed UHF near-field segmented Loop Antenna
Antennas and Propagation (APCAP), 2012 IEEE Asia-Pacific Conference on, 2012Co-Authors: Jin Shi, Xianming Qing, Zhi Ning ChenAbstract:A cavity backed segmented Loop Antenna is proposed for ultra high frequency (UHF) near-field radio frequency identification (RFID) readers. The induced current along the cavity edges shows significant effect on the impedance matching and magnetic field distribution of the segmented Loop Antenna. A backed cavity with optimized dimensions enables the Antenna generating stronger magnetic field so that the reading range is enhanced. The reading range of an Antenna prototype with a cavity of optimized dimensions of 234 mm × 234 mm × 51 mm is increased by 7 mm compared to that of the segmented Loop Antenna without any cavity.
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Loop Antenna for uhf near field rfid reader
European Conference on Antennas and Propagation, 2010Co-Authors: Zhi Ning Chen, Xianming QingAbstract:A Loop Antenna with phase shifters is proposed for ultra-high frequency (UHF) near-field radio frequency identification (RFID) readers. Using stub phase shifters, the solid-line Loop Antenna is capable of generating strong and uniform magnetic field in a near-field zone even though the perimeter of the Loop is electrically large. Based on this design concept, a square Loop Antenna with a perimeter of two wavelengths at 915 MHz is prototyped and exhibits 100% reading rate with the reading range up to 24 mm.
Kunpeng Wei - One of the best experts on this subject based on the ideXlab platform.
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a mng tl Loop Antenna array with horizontally polarized omnidirectional patterns
IEEE Transactions on Antennas and Propagation, 2012Co-Authors: Kunpeng Wei, Zhenghe Feng, Zhijun Zhang, Magdy F IskanderAbstract:A horizontally polarized omnidirectional planar Loop Antenna that employs an artificial mu-negative transmission line (MNG-TL) is proposed. The MNG-TL is designed using periodically loaded parallel-plate lines. The reactive loading is inspired by the zeroth-order resonator (ZOR), which has a propagation constant of zero. Due to the unique property of an infinite wavelength, the MNG-TL Loop Antenna presented in this paper allows current along the Loop to remain in phase so that a horizontal polarized omnidirectional pattern is generated. A series-fed array, which is composed of four MNG-TL Loop Antennas and operates at 2.4 GHz band, is designed, fabrication, and measured. The MNG-TL Loop Antenna array offers a horizontally polarized omnidirectional radiation pattern with enhanced gain of 6.5 ~ 7.9 dBi and measured radiation efficiency exceeding 85% for covering bands. The concept extends the degrees of design freedom for horizontally polarized omnidirectional Antenna array.
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design of a wideband horizontally polarized omnidirectional printed Loop Antenna
IEEE Antennas and Wireless Propagation Letters, 2012Co-Authors: Kunpeng Wei, Zhenghe FengAbstract:This letter presents the design of a novel wideband horizontally polarized omnidirectional printed Loop Antenna. The proposed Antenna consists of a Loop with periodical capacitive loading and a parallel stripline as an impedance transformer. Periodical capacitive loading is realized by adding interlaced coupling lines at the end of each section. Similarly to mu-zero resonance (MZR) Antennas, the periodical capacitive loaded Loop Antenna proposed in this letter allows current along the Loop to remain in phase and uniform. Therefore, it can achieve a horizontally polarized omnidirectional pattern in the far field, like a magnetic dipole Antenna, even though the perimeter of the Loop is comparable to the operating wavelength. Furthermore, the periodical capacitive loading is also useful to achieve a wide impedance bandwidth. A prototype of the proposed periodical capacitive loaded Loop Antenna is fabricated and measured. It can provide a wide impedance bandwidth of about 800 MHz (2170-2970 MHz, 31.2%) and a horizontally polarized omnidirectional pattern in the azimuth plane.
Zhenghe Feng - One of the best experts on this subject based on the ideXlab platform.
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A Compact Dual-Mode Metamaterial-Based Loop Antenna for Pattern Diversity
IEEE Antennas and Wireless Propagation Letters, 2015Co-Authors: Yi Zhang, Zhijun Zhang, Yue Li, Zhenghe FengAbstract:This letter presents a novel design of compact dual-port dual-mode metamaterial-based Loop Antenna for pattern diversity. The proposed metamaterial-based Loop Antenna consists of a Loop based on periodically loaded capacitive arc strips and two independent ports with feeding networks. Similar to mu-zero resonance (MZR) Antennas, the periodically loaded capacitive Loop Antenna proposed in this letter allows current along the Loop to remain in phase and uniform. By making use of a hybrid feed network, the even and odd modes of the proposed metamaterial-based Loop Antenna are exploited so that its pattern diversity is achieved effectively. The theory of operation and performances of the proposed Antenna are demonstrated in both a full-wave simulation and in the experiments.
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a mng tl Loop Antenna array with horizontally polarized omnidirectional patterns
IEEE Transactions on Antennas and Propagation, 2012Co-Authors: Kunpeng Wei, Zhenghe Feng, Zhijun Zhang, Magdy F IskanderAbstract:A horizontally polarized omnidirectional planar Loop Antenna that employs an artificial mu-negative transmission line (MNG-TL) is proposed. The MNG-TL is designed using periodically loaded parallel-plate lines. The reactive loading is inspired by the zeroth-order resonator (ZOR), which has a propagation constant of zero. Due to the unique property of an infinite wavelength, the MNG-TL Loop Antenna presented in this paper allows current along the Loop to remain in phase so that a horizontal polarized omnidirectional pattern is generated. A series-fed array, which is composed of four MNG-TL Loop Antennas and operates at 2.4 GHz band, is designed, fabrication, and measured. The MNG-TL Loop Antenna array offers a horizontally polarized omnidirectional radiation pattern with enhanced gain of 6.5 ~ 7.9 dBi and measured radiation efficiency exceeding 85% for covering bands. The concept extends the degrees of design freedom for horizontally polarized omnidirectional Antenna array.
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design of a wideband horizontally polarized omnidirectional printed Loop Antenna
IEEE Antennas and Wireless Propagation Letters, 2012Co-Authors: Kunpeng Wei, Zhenghe FengAbstract:This letter presents the design of a novel wideband horizontally polarized omnidirectional printed Loop Antenna. The proposed Antenna consists of a Loop with periodical capacitive loading and a parallel stripline as an impedance transformer. Periodical capacitive loading is realized by adding interlaced coupling lines at the end of each section. Similarly to mu-zero resonance (MZR) Antennas, the periodical capacitive loaded Loop Antenna proposed in this letter allows current along the Loop to remain in phase and uniform. Therefore, it can achieve a horizontally polarized omnidirectional pattern in the far field, like a magnetic dipole Antenna, even though the perimeter of the Loop is comparable to the operating wavelength. Furthermore, the periodical capacitive loading is also useful to achieve a wide impedance bandwidth. A prototype of the proposed periodical capacitive loaded Loop Antenna is fabricated and measured. It can provide a wide impedance bandwidth of about 800 MHz (2170-2970 MHz, 31.2%) and a horizontally polarized omnidirectional pattern in the azimuth plane.
Jaehoon Choi - One of the best experts on this subject based on the ideXlab platform.
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Compact segmented Loop Antenna for UAV applications
2017 International Symposium on Antennas and Propagation (ISAP), 2017Co-Authors: Do-gu Kang, Jaehoon ChoiAbstract:For UAV (unmanned aerial vehicle) applications, a proposed miniaturized segmented Loop Antenna is comprised of a segmented Loop, stubs, and a shorting strip. By reducing the number of segments and adding stubs, the compact segmented Loop Antenna is realized. Addition of the shorting strip improve the impedance matching. The Antenna has omnidirectional radiation at 956 MHz.
