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Chow-Yen-Desmond Sim
Electrical Engineering, Feng Chia University, 34902 Taichung, Taiwan, 40724

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Journal article
Published: 12 August 2021 in IEEE Antennas and Wireless Propagation Letters
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A circularly polarized (CP) meander loop antenna design for GNSS applications is presented. The antenna size is 52.552.50.76 mm3 and it is placed 10 mm above a 100100 mm2 metal plane. The proposed antenna utilizes a meandered loop antenna and have applied a perturbed element into the loop to excite two equal electric fields with near 90 phase difference, thereby radiating a good CP radiation. In addition, a triangular patch is loaded to the two diagonal corners of the loop are for improving the CP performances, as well as maintaining its CP radiation even under the interference of a large metal surface beneath it. The simulated 10-dB impedance bandwidth of proposed antenna was 2.2% (1.5571.593 GHz), and the measured one was 2.4% (1.5531.591 GHz). The simulated and measured 3-dB AR bandwidths were 0.8% (1.571.583 GHz) and 1.02% (1.5671.583 GHz), respectively. Lastly, the proposed antenna is suitable for GNSS application that has large metal surface/ground, such as the roof of a vehicle.

ACS Style

Tuan-Yung Han; Chow-Yen-Desmond Sim; Chin-Yang Chen. A Circularly Polarized Meander Loop Antenna Design for GNSS Application. IEEE Antennas and Wireless Propagation Letters 2021, PP, 1 -1.

AMA Style

Tuan-Yung Han, Chow-Yen-Desmond Sim, Chin-Yang Chen. A Circularly Polarized Meander Loop Antenna Design for GNSS Application. IEEE Antennas and Wireless Propagation Letters. 2021; PP (99):1-1.

Chicago/Turabian Style

Tuan-Yung Han; Chow-Yen-Desmond Sim; Chin-Yang Chen. 2021. "A Circularly Polarized Meander Loop Antenna Design for GNSS Application." IEEE Antennas and Wireless Propagation Letters PP, no. 99: 1-1.

Journal article
Published: 24 June 2021 in Sensors
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A single-layer ±45° dual-polarized directional array antenna for millimeter wave (mm-wave) applications is designed in this communication. Based on the theory of orthogonal circularly polarized (CP) wave multiplexing, two ports of a series-fed dual CP array are fed with equal amplitudes, and the array can radiate a linearly polarized wave with ±45° polarization orientations through the adjustment of the feeding phase difference. As the two ports of the series-fed array are simultaneously excited, the antenna can achieve directional radiation. In addition, the cross-polarization level of the array can be effectively suppressed by placing two series-fed arrays side by side. A prototype of the designed array antenna operating at 30 GHz is fabricated and measured; the working bandwidth of the proposed antenna is approximately 3.5%. Owing to its simple structure and directional radiation, the proposed antenna array is a competitive candidate for mm-wave applications.

ACS Style

Qinyi Lv; Yu-Hang Yang; Shi-Gang Zhou; Chan Shao; Deyun Zhou; Chow-Yen-Desmond Sim. Design of a Single-Layer ±45° Dual-Polarized Directional Array Antenna for Millimeter Wave Applications. Sensors 2021, 21, 4326 .

AMA Style

Qinyi Lv, Yu-Hang Yang, Shi-Gang Zhou, Chan Shao, Deyun Zhou, Chow-Yen-Desmond Sim. Design of a Single-Layer ±45° Dual-Polarized Directional Array Antenna for Millimeter Wave Applications. Sensors. 2021; 21 (13):4326.

Chicago/Turabian Style

Qinyi Lv; Yu-Hang Yang; Shi-Gang Zhou; Chan Shao; Deyun Zhou; Chow-Yen-Desmond Sim. 2021. "Design of a Single-Layer ±45° Dual-Polarized Directional Array Antenna for Millimeter Wave Applications." Sensors 21, no. 13: 4326.

Journal article
Published: 17 March 2021 in IEEE Antennas and Wireless Propagation Letters
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Classical microstrip patch antenna fabricated on a dielectric substrate suffers from poor gain, efficiency, and high cross-polarization due to the automatic excitation of TM0 surface wave. It also radiates strong fields along the horizon which is susceptible to MIMO or array configurations. In view of this, a separate class of circular microstrip antenna (CMA) known as the reduced surface wave (RSW) circular patch antenna has been proposed with a pair of shorting strips. Unlike earlier RSW inspired antenna that mainly confirmed their ability for the successful reduction in the mutual coupling between array elements, here, the enhancement of radiation properties is considered. The proposed RSW inspired circular patch yields concurrent improvement in gain (8.5 dBi), efficiency (93%), as well as polarization purity (25 dB) in both the principal planes.

ACS Style

Zonun Mawii; Abhijyoti Ghosh; L. Lolit K. Singh; Sudipta Chattopadhyay; Chow-Yen-Desmond Sim. Reduced-Surface-Wave-Inspired Circular Microstrip Antenna for Concurrent Improvement in Radiation Characteristics. IEEE Antennas and Wireless Propagation Letters 2021, 20, 858 -862.

AMA Style

Zonun Mawii, Abhijyoti Ghosh, L. Lolit K. Singh, Sudipta Chattopadhyay, Chow-Yen-Desmond Sim. Reduced-Surface-Wave-Inspired Circular Microstrip Antenna for Concurrent Improvement in Radiation Characteristics. IEEE Antennas and Wireless Propagation Letters. 2021; 20 (5):858-862.

Chicago/Turabian Style

Zonun Mawii; Abhijyoti Ghosh; L. Lolit K. Singh; Sudipta Chattopadhyay; Chow-Yen-Desmond Sim. 2021. "Reduced-Surface-Wave-Inspired Circular Microstrip Antenna for Concurrent Improvement in Radiation Characteristics." IEEE Antennas and Wireless Propagation Letters 20, no. 5: 858-862.

Journal article
Published: 13 October 2020 in IEEE Antennas and Wireless Propagation Letters
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A microstrip-fed circular ring-slot antenna excited at 2.45 GHz band for WLAN 2.4 GHz operation is initially studied to achieve very wideband harmonic suppression between 3 GHz and 20 GHz (7 fc), in which the technique of integrating a stepped impedance resonator (SIR) that has low pass filter (LPF) characteristic and open stubs that possesses band-stop characteristic into the slot antenna is applied. By further loading two dissimilar slots into the single-band design, a triple-band operation for WLAN 2.4/5.2/5.8 GHz with harmonic suppression of up to 7.86 fc (2.73 21.9 GHz) is realized.

ACS Style

Chih-Chiang Chen; Sheng-Yang Huang; Xiu Yin Zhang; Chow-Yen-Desmond Sim. Microstrip-Fed Circular Ring-Slot Antennas With Very Wideband Harmonic Suppression. IEEE Antennas and Wireless Propagation Letters 2020, 19, 2295 -2299.

AMA Style

Chih-Chiang Chen, Sheng-Yang Huang, Xiu Yin Zhang, Chow-Yen-Desmond Sim. Microstrip-Fed Circular Ring-Slot Antennas With Very Wideband Harmonic Suppression. IEEE Antennas and Wireless Propagation Letters. 2020; 19 (12):2295-2299.

Chicago/Turabian Style

Chih-Chiang Chen; Sheng-Yang Huang; Xiu Yin Zhang; Chow-Yen-Desmond Sim. 2020. "Microstrip-Fed Circular Ring-Slot Antennas With Very Wideband Harmonic Suppression." IEEE Antennas and Wireless Propagation Letters 19, no. 12: 2295-2299.

Journal article
Published: 30 June 2020 in IEEE Access
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A dualband dual-polarized antenna element with dual wide beamwidths for 5G microcell applications is initially proposed and investigated in this paper. To achieve very low manufacturing cost, an unprecedented method is applied to the antenna element, in which the antenna components are printed separately on F-4B substrates, follow by assembling them to form the antenna element (similar to building block assembly). To further achieve high gain, an 1×4 antenna array is also designed. Measured results show that the half power beamwidths (HPBWs) in H- and E-planes are 112±1∘ and 105±3∘ in the lower frequency band of 3.22-3.88 GHz, respectively, and 99±3∘ and 106±4∘ in the upper frequency band of 4.52-5.02 GHz, respectively. In addition, high front-to-back ratio (FBR) of approximately 19 dB and high isolation of 33.6 dB can also be achieved.

ACS Style

Botao Feng; Jiexin Lai; Chow-Yen-Desmond Sim. A Building Block Assembly Dualband Dual-Polarized Antenna With Dual Wide Beamwidths for 5G Microcell Applications. IEEE Access 2020, 8, 123359 -123368.

AMA Style

Botao Feng, Jiexin Lai, Chow-Yen-Desmond Sim. A Building Block Assembly Dualband Dual-Polarized Antenna With Dual Wide Beamwidths for 5G Microcell Applications. IEEE Access. 2020; 8 (99):123359-123368.

Chicago/Turabian Style

Botao Feng; Jiexin Lai; Chow-Yen-Desmond Sim. 2020. "A Building Block Assembly Dualband Dual-Polarized Antenna With Dual Wide Beamwidths for 5G Microcell Applications." IEEE Access 8, no. 99: 123359-123368.

Journal article
Published: 30 June 2020 in IEEE Transactions on Vehicular Technology
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A tri-polarized antenna with diverse radiation characteristics is proposed in this paper. This design mainly consists of two pairs of loop radiating dipoles and an omnidirectional monopole antenna element, which are used for the fifth generation (5G) and vehicle to everything (V2X) communications, respectively. By adding eight pairs of inverted L-shaped patches with unequal sizes around the proposed dipoles, wide beamwidths in both E- and H-planes can be obtained across the desired lower and upper frequency bands. Furthermore, by employing eight fork-shaped microstrip stubs to combine the circular monopole antenna element and the L-shaped patches, the flare angle of the conical beam can be increased to 180°, which results in gain enhancement in the azimuth plane. Finally, the proposed loop radiating dipoles are excited by a pair of symmetrical differentially-fed feeding lines. Consequently, high port isolation for the proposed loop radiating dipoles as well as low gain variations for the monopole antenna element can be achieved. Measured results show that the impedance bandwidths of 32.84% (2.8-3.9 GHz) and 18.18% (4.5-5.4 GHz) can be achieved for the 5G communications. Wide half power beamwidths (HPBW) of larger than 103° in E-plane and 91° in H-plane can be achieved across the operating bands. In addition, a bandwidth of 5.5% (5.82-6.15 GHz) with gain of 2.47±0.69 dBi in the azimuth plane can also be obtained for V2X communications.

ACS Style

Botao Feng; Jiaying Chen; Sixing Yin; Chow-Yen-Desmond Sim; Zhentao Zhao. A Tri-Polarized Antenna With Diverse Radiation Characteristics for 5G and V2X Communications. IEEE Transactions on Vehicular Technology 2020, 69, 10115 -10126.

AMA Style

Botao Feng, Jiaying Chen, Sixing Yin, Chow-Yen-Desmond Sim, Zhentao Zhao. A Tri-Polarized Antenna With Diverse Radiation Characteristics for 5G and V2X Communications. IEEE Transactions on Vehicular Technology. 2020; 69 (9):10115-10126.

Chicago/Turabian Style

Botao Feng; Jiaying Chen; Sixing Yin; Chow-Yen-Desmond Sim; Zhentao Zhao. 2020. "A Tri-Polarized Antenna With Diverse Radiation Characteristics for 5G and V2X Communications." IEEE Transactions on Vehicular Technology 69, no. 9: 10115-10126.

Research article
Published: 21 May 2020 in International Journal of RF and Microwave Computer-Aided Engineering
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A dual‐polarized antenna for the fifth‐generation (5G) array/massive multiple‐input multiple‐output (MIMO) communications is proposed in this paper. Through combining dual‐polarized differentially feeding structure and complementary magneto‐electric (ME) dipole antenna, low cross polarization (X‐pol), high gain, and isolation characteristics can be achieved by the antenna element. To take advantage of these characteristics in the array, a modified 1‐to‐16‐way H‐shaped differentially feeding network is designed to feed the 16‐element antenna array. Here, vertical cross‐shaped patches with dotted slots are arranged between adjacent ME‐dipole antenna elements to further improve the array isolation. By removing the H‐shaped differentially feeding network and the substrate at the bottom, a high‐capacity MIMO antenna system can be achieved. Measured results show that low X‐pol level of −35.7 dB and high gain of larger than 8.1 dBi can be attained by the antenna elements across the 5G frequency bands (3.3‐5.1 GHz). In addition, the antenna array has exhibited high gain of 17.3 dBi and the MIMO antenna has realized very low envelope correlation coefficient of 0.004.

ACS Style

Botao Feng; Tao Luo; Tian Zhou; Chow‐Yen‐Desmond Sim. A dual‐polarized antenna with low cross polarization, high gain, and isolation for the fifth‐generation array/multiple‐input multiple‐output communications. International Journal of RF and Microwave Computer-Aided Engineering 2020, 31, 1 .

AMA Style

Botao Feng, Tao Luo, Tian Zhou, Chow‐Yen‐Desmond Sim. A dual‐polarized antenna with low cross polarization, high gain, and isolation for the fifth‐generation array/multiple‐input multiple‐output communications. International Journal of RF and Microwave Computer-Aided Engineering. 2020; 31 (2):1.

Chicago/Turabian Style

Botao Feng; Tao Luo; Tian Zhou; Chow‐Yen‐Desmond Sim. 2020. "A dual‐polarized antenna with low cross polarization, high gain, and isolation for the fifth‐generation array/multiple‐input multiple‐output communications." International Journal of RF and Microwave Computer-Aided Engineering 31, no. 2: 1.

Research article
Published: 28 April 2020 in International Journal of RF and Microwave Computer-Aided Engineering
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A low‐profile wideband dual‐polarized antenna with high gain, low gain variations, and low cross‐polarization for the fifth generation (5G) indoor distribution system is proposed. By using circular‐thread vase‐shaped structure, a low profile of 0.23λ0 (λ0 is the free‐space wavelength at the starting frequency) as well as low gain variation feature can be achieved by the vertically polarized (VP) radiating element. An eight‐way power divider network is employed to feed the horizontally polarized (HP) dipoles so that wideband performance is obtained. Here, eight pairs of arc‐shaped parasitic strips are used to broaden the bandwidth, and eight pairs of director elements are introduced to enhance the gain and reduce the gain variations. In addition, the protruded stubs that are extended from the circular ground plane will help to reduce the cross polarization in the VP direction. Measured results show that a bandwidth of 46.5% (3.3‐5.3 GHz) (S11 < −10 dB) with a gain of 0.85 ± 0.35 dBi, and another bandwidth of 85.0% (2.5‐6.2 GHz) with a gain of 4.75 ± 1.75 dBi can be realized in the HP and VP directions, respectively. Furthermore, high isolation (>27 dB) and low cross polarization (<−24 dB) can also be attained. Therefore, the proposed antenna is a good candidate for 5G indoor distributed system.

ACS Style

Botao Feng; Tao Luo; Zhentao Zhao; Kwok L. Chung; Chow‐Yen‐Desmond Sim. A low‐profile wideband dual‐polarized antenna with gain enhancement, low gain variations, and low cross polarization for 5G indoor communications. International Journal of RF and Microwave Computer-Aided Engineering 2020, 30, 1 .

AMA Style

Botao Feng, Tao Luo, Zhentao Zhao, Kwok L. Chung, Chow‐Yen‐Desmond Sim. A low‐profile wideband dual‐polarized antenna with gain enhancement, low gain variations, and low cross polarization for 5G indoor communications. International Journal of RF and Microwave Computer-Aided Engineering. 2020; 30 (8):1.

Chicago/Turabian Style

Botao Feng; Tao Luo; Zhentao Zhao; Kwok L. Chung; Chow‐Yen‐Desmond Sim. 2020. "A low‐profile wideband dual‐polarized antenna with gain enhancement, low gain variations, and low cross polarization for 5G indoor communications." International Journal of RF and Microwave Computer-Aided Engineering 30, no. 8: 1.

Journal article
Published: 20 April 2020 in IEEE Antennas and Wireless Propagation Letters
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A MIMO antenna array for future broadband 5G New Radio (5G NR) metal-frame smartphone applications is proposed. The MIMO antenna array is realized by loading eight identical antennas (Ant1~Ant8) into the metal-frame of the smartphone to form an 8-antenna array for sub-6GHz 8×8 MIMO system. Each antenna element is a slot antenna type that is composed of an L-shaped open slot and a 50Ω microstrip feed line, and good impedance matching in the upper frequency band can be achieve by loading a tuning stub to the feed line. The 10-dB impedance bandwidth of the proposed 8-antenna array can cover the 5G NR Bands n77/n78/n79, and WLAN 5-GHz band. Besides demonstrating desirable antenna efficiency of 50—82% and ECC of < 0.11, the isolations between adjacent array elements are also > 12-dB. At 20-dB SNR, the calculated peak channel capacity of the proposed 8-antenna array applied to an 8 × 8 MIMO system was 43.93 bps/Hz.

ACS Style

Horng-Dean Chen; Yuan-Chung Tsai; Chow-Yen-Desmond Sim; Colin Kuo. Broadband Eight-Antenna Array Design for Sub-6 GHz 5G NR Bands Metal-Frame Smartphone Applications. IEEE Antennas and Wireless Propagation Letters 2020, 19, 1078 -1082.

AMA Style

Horng-Dean Chen, Yuan-Chung Tsai, Chow-Yen-Desmond Sim, Colin Kuo. Broadband Eight-Antenna Array Design for Sub-6 GHz 5G NR Bands Metal-Frame Smartphone Applications. IEEE Antennas and Wireless Propagation Letters. 2020; 19 (7):1078-1082.

Chicago/Turabian Style

Horng-Dean Chen; Yuan-Chung Tsai; Chow-Yen-Desmond Sim; Colin Kuo. 2020. "Broadband Eight-Antenna Array Design for Sub-6 GHz 5G NR Bands Metal-Frame Smartphone Applications." IEEE Antennas and Wireless Propagation Letters 19, no. 7: 1078-1082.

Journal article
Published: 06 April 2020 in IEEE Access
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A multi-loop travelling-wave ultra-high frequency (UHF) radio frequency identification (RFID) near-field antenna (NFA) is proposed and investigated. To achieve strong and uniform magnetic field, as well as extendable reading range, multiple λ/2 rectangular loop structures printed on both sides of an FR4 substrate is adopted. Via the RFID system measurement for magnetic field distribution, the maximum reading range of the proposed NFA is 11 cm, and its corresponding 100% reading rate distance is 5 cm. Here, broad 10-dB impedance bandwidth of 18.7% (816–984 MHz) was measured, which can cover both ETSI (European Telecommunication Standards Institute) and FCC (Federal Communications Commission) bands. Parametric studies are further carried out to facilitate the design and optimization processes.

ACS Style

Zijian Xing; Haotian Li; Chow-Yen-Desmond Sim; Jianying Li; Ziliang Li. Study of a Multi-Loop Travelling Wave UHF RFID Near-Field Antenna. IEEE Access 2020, 8, 69829 -69837.

AMA Style

Zijian Xing, Haotian Li, Chow-Yen-Desmond Sim, Jianying Li, Ziliang Li. Study of a Multi-Loop Travelling Wave UHF RFID Near-Field Antenna. IEEE Access. 2020; 8 (99):69829-69837.

Chicago/Turabian Style

Zijian Xing; Haotian Li; Chow-Yen-Desmond Sim; Jianying Li; Ziliang Li. 2020. "Study of a Multi-Loop Travelling Wave UHF RFID Near-Field Antenna." IEEE Access 8, no. 99: 69829-69837.

Journal article
Published: 18 March 2020 in IEEE Transactions on Antennas and Propagation
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A compact wideband circularly polarized (CP) magneto-electric (ME) dipole antenna array is proposed. In order to achieve compact size and wideband characteristics, a novel substrate integrated waveguide (SIW) to coaxial transition (SCT) was designed to connect the lightning-shaped ME-dipole antenna element and a SIW feeding network. Particularly, a SCT-based power divider network together with the sequential-rotation (SR) technique was employed to improve the axial ratio (AR) bandwidth of the 4×4 antenna array. The antenna array prototype was fabricated to verify the design. Measured results show that an impedance bandwidth of 27.7% (23.3-30.8 GHz) and 3-dB gain bandwidth of 25.3% (23.5-30.3 GHz) were achieved. Moreover, a 3-dB AR bandwidth of 27.8% (23.2-30.8 GHz) with a peak gain of 20.2 dBic were also recorded. Therefore, it is a good candidate for the fifth generation (5G) millimeter wave (mm-wave) communications.

ACS Style

Botao Feng; Jiexin Lai; Kwok L. Chung; Tieh-Yuh Chen; Yeyu Liu; Chow-Yen-Desmond Sim. A Compact Wideband Circularly Polarized Magneto-Electric Dipole Antenna Array for 5G Millimeter-Wave Application. IEEE Transactions on Antennas and Propagation 2020, 68, 6838 -6843.

AMA Style

Botao Feng, Jiexin Lai, Kwok L. Chung, Tieh-Yuh Chen, Yeyu Liu, Chow-Yen-Desmond Sim. A Compact Wideband Circularly Polarized Magneto-Electric Dipole Antenna Array for 5G Millimeter-Wave Application. IEEE Transactions on Antennas and Propagation. 2020; 68 (9):6838-6843.

Chicago/Turabian Style

Botao Feng; Jiexin Lai; Kwok L. Chung; Tieh-Yuh Chen; Yeyu Liu; Chow-Yen-Desmond Sim. 2020. "A Compact Wideband Circularly Polarized Magneto-Electric Dipole Antenna Array for 5G Millimeter-Wave Application." IEEE Transactions on Antennas and Propagation 68, no. 9: 6838-6843.

Journal article
Published: 23 January 2020 in IEEE Access
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A dual-wideband dual-polarized antenna using metasurface for the fifth generation (5G) millimeter wave (mm-wave) communications is proposed. It is designed and analyzed based on characteristic mode theory (CMT). The proposed metasurface is mainly composed of a 3×3 square-patch, in which its four corner patches are further sub-divided into a 4×4 sub-patch array, while the size of the other four edge patches is reduced and the center patch is etched with a pair of orthogonal slots. By doing so, the side lobe level can be effectively reduced and the main beam radiation can be enhanced. The metasurface is excited by a pair of orthogonally arranged substrate-integrated-waveguide (SIW) to grounded-coplanar-waveguide (GCPW) dual-polarized feeding networks that help to reduce the insertion loss and expand the frequency bandwidth of the feeding ports. In order to yield higher gain, four proposed metasurfaces are fed by a pair of 1-to-8-way power divider feeding networks including a pair of low-transmission-loss E-plane phase shifter. Measured results show desirable impedance bandwidths of 13.85% (24.2-27.8 GHz) and 14.81% (36.9-42.8 GHz) in the lower and upper frequency bands, respectively, and their corresponding average gains are 13.96 and 15.46 dBi.

ACS Style

Botao Feng; Xiaoyuan He; Jui-Ching Cheng; Chow-Yen-Desmond Sim. Dual-Wideband Dual-Polarized Metasurface Antenna Array for the 5G Millimeter Wave Communications Based on Characteristic Mode Theory. IEEE Access 2020, 8, 21589 -21601.

AMA Style

Botao Feng, Xiaoyuan He, Jui-Ching Cheng, Chow-Yen-Desmond Sim. Dual-Wideband Dual-Polarized Metasurface Antenna Array for the 5G Millimeter Wave Communications Based on Characteristic Mode Theory. IEEE Access. 2020; 8 (99):21589-21601.

Chicago/Turabian Style

Botao Feng; Xiaoyuan He; Jui-Ching Cheng; Chow-Yen-Desmond Sim. 2020. "Dual-Wideband Dual-Polarized Metasurface Antenna Array for the 5G Millimeter Wave Communications Based on Characteristic Mode Theory." IEEE Access 8, no. 99: 21589-21601.

Journal article
Published: 25 November 2019 in IEEE Access
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In this paper, a new design method to enhance the isolation of a two-antenna building block is introduced. Here, a two-antenna building block (Ant 1 and Ant 2) that is composed of a gap-coupled loop antenna (Ant 1) and a loop antenna (Ant 2) is meticulously designed to allow Ant 1 to excite a standing-wave region that can be formed on the structure of Ant 2. To exhibit high isolation (26 dB) between the two antennas, the stable current null point existed in the standing wave region is exploited and designed to fall at the feed point of Ant 2 during the excitation of Ant 1. By employing this proposed building block, a four-port multiple-input multiple-output (MIMO) system and an eight-port MIMO system operating in the long term evolution (LTE) band 42 (3.4-3.6 GHz) are implemented. The proposed four-antenna and eight-antenna MIMO arrays can yield desirable measured isolation of better than 23 dB and 17.9 dB, respectively, over the band of interest, and their respective measured ECCs (envelope correlation coefficients) were lower than 0.032 and 0.075. To further evaluate the MIMO performances of the presented MIMO arrays, their ergodic channel capacities are also investigated.

ACS Style

Aidi Ren; Ying Liu; Hong-Wei Yu; Yongtao Jia; Chow-Yen-Desmond Sim; Yunxue Xu. A High-Isolation Building Block Using Stable Current Nulls for 5G Smartphone Applications. IEEE Access 2019, 7, 170419 -170429.

AMA Style

Aidi Ren, Ying Liu, Hong-Wei Yu, Yongtao Jia, Chow-Yen-Desmond Sim, Yunxue Xu. A High-Isolation Building Block Using Stable Current Nulls for 5G Smartphone Applications. IEEE Access. 2019; 7 ():170419-170429.

Chicago/Turabian Style

Aidi Ren; Ying Liu; Hong-Wei Yu; Yongtao Jia; Chow-Yen-Desmond Sim; Yunxue Xu. 2019. "A High-Isolation Building Block Using Stable Current Nulls for 5G Smartphone Applications." IEEE Access 7, no. : 170419-170429.

Journal article
Published: 22 November 2019 in IEEE Antennas and Wireless Propagation Letters
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Over the past few years, there has been a huge demand to design a simple printed antenna for high speed multimedia communication with low cost, compact size, wideband, and low co-polarization (CP) to cross-polarization (XP) isolation levels. In this work, a simple and completely planar air gap loaded rectangular microstrip antenna integrated with single shorting post and defected ground structures (DGS) has been thoroughly investigated to obtain wide bandwidth of 58.72% (8.3-15.2 GHz) at X and Ku bands. Besides exhibiting good broadside patterns and desirable gain (>5dBi), good CP to XP isolation levels (16 dB) are also achieved. Furthermore, the proposed antenna has a low profile of 0.083 ${\lambda_{0}}$ .

ACS Style

Tanmoy Sarkar; Abhijyoti Ghosh; Lourembam Lolit Kumar Singh; Sudipta Chattopadhyay; Chow-Yen-Desmond Sim. DGS-Integrated Air-Loaded Wideband Microstrip Antenna for X- and Ku-Band. IEEE Antennas and Wireless Propagation Letters 2019, 19, 114 -118.

AMA Style

Tanmoy Sarkar, Abhijyoti Ghosh, Lourembam Lolit Kumar Singh, Sudipta Chattopadhyay, Chow-Yen-Desmond Sim. DGS-Integrated Air-Loaded Wideband Microstrip Antenna for X- and Ku-Band. IEEE Antennas and Wireless Propagation Letters. 2019; 19 (1):114-118.

Chicago/Turabian Style

Tanmoy Sarkar; Abhijyoti Ghosh; Lourembam Lolit Kumar Singh; Sudipta Chattopadhyay; Chow-Yen-Desmond Sim. 2019. "DGS-Integrated Air-Loaded Wideband Microstrip Antenna for X- and Ku-Band." IEEE Antennas and Wireless Propagation Letters 19, no. 1: 114-118.

Journal article
Published: 13 November 2019 in IEEE Antennas and Wireless Propagation Letters
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An 8-antenna array with wideband operation for future 5G NR (5G New Radio) mobile devices is studied. Each array element is composed of an inverted-F antenna with shorting branches and parasitic elements. The driving element (monopole structure) and the shorting element (inverted-L branch and inverted-C branch) enable the antenna to obtain multiple modes, while the parasitic element, open slit, and stub can improve the impedance matching. The 6dB impedance bandwidth of the proposed 8-antenna array can completely cover the 5G Sub-6GHz NR frequency Bands n77/n78/n79, which includes the 5G band of US (3.55-4.2 GHz), China, EU and Japan (3.6-4.2 GHz, 4.4-4.9 GHz), as well as the LTE Band 46 (5.15-5.925 GHz). From the measured results, the isolation between adjacent array elements is lower than 10dB and its corresponding ECC is also lower than 0.1.

ACS Style

Chow-Yen-Desmond Sim; Heng-You Liu; Ci-Jin Huang. Wideband MIMO Antenna Array Design for Future Mobile Devices Operating in the 5G NR Frequency Bands n77/n78/n79 and LTE Band 46. IEEE Antennas and Wireless Propagation Letters 2019, 19, 74 -78.

AMA Style

Chow-Yen-Desmond Sim, Heng-You Liu, Ci-Jin Huang. Wideband MIMO Antenna Array Design for Future Mobile Devices Operating in the 5G NR Frequency Bands n77/n78/n79 and LTE Band 46. IEEE Antennas and Wireless Propagation Letters. 2019; 19 (1):74-78.

Chicago/Turabian Style

Chow-Yen-Desmond Sim; Heng-You Liu; Ci-Jin Huang. 2019. "Wideband MIMO Antenna Array Design for Future Mobile Devices Operating in the 5G NR Frequency Bands n77/n78/n79 and LTE Band 46." IEEE Antennas and Wireless Propagation Letters 19, no. 1: 74-78.

Journal article
Published: 19 August 2019 in IEEE Transactions on Antennas and Propagation
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A low-profile differentially fed dual-polarized antenna with high gain and isolation is proposed for 5G microcell communications. By introducing two pairs of symmetrical meandering conductors to connect both ends of the radiating cross slots, a compact-size antenna with wide bandwidth can be achieved. By further adopting an artificial magnetic conductor-backed (AMC) reflector that is arranged below the radiating patches with a distance of 6 mm, the antenna profile can be reduced from 0.25λc to 0.13 λc (where λc is the free-space wavelength at the center frequency), while both the gain and frequency bandwidth are also enhanced. Furthermore, owing to the orthogonal differentially-fed structure, the antenna element displays a high port isolation of 37 dB. Finally, by meticulously designing the feeding network, much narrower beamwidth can be yielded, and hence the unidirectional gain is further improved. Measured results show that a lower-frequency bandwidth of 13.5% (3.26-3.73 GHz) with gain of 15.7±0.1 dBi and upper-frequency bandwidth of 7.6% (4.68-5.05 GHz) with 15.55±0.05 dBi gain can be obtained by the proposed antenna array. In addition, port isolation better than 28 dB and stable radiation patterns can be achieved. With the aforementioned characteristics, the proposed antenna is a good candidate for future 5G microcell communications.

ACS Style

Botao Feng; Xiaoyuan He; Jui-Ching Cheng; Qingsheng Zeng; Chow-Yen-Desmond Sim. A Low-Profile Differentially Fed Dual-Polarized Antenna With High Gain and Isolation for 5G Microcell Communications. IEEE Transactions on Antennas and Propagation 2019, 68, 90 -99.

AMA Style

Botao Feng, Xiaoyuan He, Jui-Ching Cheng, Qingsheng Zeng, Chow-Yen-Desmond Sim. A Low-Profile Differentially Fed Dual-Polarized Antenna With High Gain and Isolation for 5G Microcell Communications. IEEE Transactions on Antennas and Propagation. 2019; 68 (1):90-99.

Chicago/Turabian Style

Botao Feng; Xiaoyuan He; Jui-Ching Cheng; Qingsheng Zeng; Chow-Yen-Desmond Sim. 2019. "A Low-Profile Differentially Fed Dual-Polarized Antenna With High Gain and Isolation for 5G Microcell Communications." IEEE Transactions on Antennas and Propagation 68, no. 1: 90-99.

Journal article
Published: 30 July 2019 in IEEE Antennas and Wireless Propagation Letters
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A fully dielectric packaged liquid patch antenna based on liquid metal alloy is presented. In this work, there are two hollow cavities embedded in a dielectric box, including a rectangular cavity placed at the upper portion acting as the radiating element, and a non-planar cavity with a central groove under the radiating element serving as the ground plane. The antenna is realized by 3D printing technique, alleviating assembly tolerance and uncertainties from printed-circuit-board approach which would degrade antenna performance. The radiating element and the ground plane are fully metallized by filling liquid metal alloy. Unlike traditional liquid antennas, the liquid packaging antenna is completely metallized by conductive liquids which does not contain any solid metals. The proposed antenna is designed to operate at 5.2 GHz. Results show that the proposed liquid patch antenna produces a satisfactory impedance matching, and a good agreement between simulation and measurement in terms of radiation characteristics is achieved at the desired frequency.

ACS Style

Guan-Long Huang; Jia-Jun Liang; Luyu Zhao; Daping He; Chow-Yen-Desmond Sim. Package-in-Dielectric Liquid Patch Antenna Based on Liquid Metal Alloy. IEEE Antennas and Wireless Propagation Letters 2019, 18, 2360 -2364.

AMA Style

Guan-Long Huang, Jia-Jun Liang, Luyu Zhao, Daping He, Chow-Yen-Desmond Sim. Package-in-Dielectric Liquid Patch Antenna Based on Liquid Metal Alloy. IEEE Antennas and Wireless Propagation Letters. 2019; 18 (11):2360-2364.

Chicago/Turabian Style

Guan-Long Huang; Jia-Jun Liang; Luyu Zhao; Daping He; Chow-Yen-Desmond Sim. 2019. "Package-in-Dielectric Liquid Patch Antenna Based on Liquid Metal Alloy." IEEE Antennas and Wireless Propagation Letters 18, no. 11: 2360-2364.

Journal article
Published: 24 July 2019 in IEEE Antennas and Wireless Propagation Letters
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ACS Style

Yan-Yan Wang; Yong-Ling Ban; Zaiping Nie; Chow-Yen-Desmond Sim. Dual-Loop Antenna for 4G LTE MIMO Smart Glasses Applications. IEEE Antennas and Wireless Propagation Letters 2019, 18, 1818 -1822.

AMA Style

Yan-Yan Wang, Yong-Ling Ban, Zaiping Nie, Chow-Yen-Desmond Sim. Dual-Loop Antenna for 4G LTE MIMO Smart Glasses Applications. IEEE Antennas and Wireless Propagation Letters. 2019; 18 (9):1818-1822.

Chicago/Turabian Style

Yan-Yan Wang; Yong-Ling Ban; Zaiping Nie; Chow-Yen-Desmond Sim. 2019. "Dual-Loop Antenna for 4G LTE MIMO Smart Glasses Applications." IEEE Antennas and Wireless Propagation Letters 18, no. 9: 1818-1822.

Journal article
Published: 06 June 2019 in IEEE Transactions on Antennas and Propagation
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In this paper, a compact building block composed of a slot antenna and a loop antenna is proposed. The slot antenna and the loop antenna share a rectangular clearance, which improves the compactness of the building block effectively. Although the slot and the loop have overlapped completely, the proposed building block exhibits good isolation (better than 19 dB) without any external decoupling structure. Four such building blocks are used to implement a compact 8-port multiple-input multiple-output (MIMO) array operating at 3.5 GHz band (3.4-3.6 GHz) for 5G metal-rimmed smartphone applications. The proposed eight-antenna MIMO array exhibits good isolation of better than 16 dB across the whole operating band. The measured efficiencies of the proposed MIMO array were between 59% and 73%, and its corresponding measured ECCs (envelope correlation coefficients) were better than 0.05. Furthermore, the calculated channel capacity of the proposed MIMO array with 20-dB signal-to-noise ratio (SNR) was about 38.2-39.8 bps/Hz across the desired bands (3.4-3.6 GHz). The measured results confirm that the proposed MIMO array is a good candidate for fifth-generation (5G) terminals.

ACS Style

Aidi Ren; Ying Liu; Chow-Yen-Desmond Sim. A Compact Building Block With Two Shared-Aperture Antennas for Eight-Antenna MIMO Array in Metal-Rimmed Smartphone. IEEE Transactions on Antennas and Propagation 2019, 67, 6430 -6438.

AMA Style

Aidi Ren, Ying Liu, Chow-Yen-Desmond Sim. A Compact Building Block With Two Shared-Aperture Antennas for Eight-Antenna MIMO Array in Metal-Rimmed Smartphone. IEEE Transactions on Antennas and Propagation. 2019; 67 (10):6430-6438.

Chicago/Turabian Style

Aidi Ren; Ying Liu; Chow-Yen-Desmond Sim. 2019. "A Compact Building Block With Two Shared-Aperture Antennas for Eight-Antenna MIMO Array in Metal-Rimmed Smartphone." IEEE Transactions on Antennas and Propagation 67, no. 10: 6430-6438.

Journal article
Published: 16 April 2019 in IEEE Transactions on Antennas and Propagation
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ACS Style

Botao Feng; Lei Li; Jui-Ching Cheng; Chow-Yen-Desmond Sim. A Dual-Band Dual-Polarized Stacked Microstrip Antenna With High-Isolation and Band-Notch Characteristics for 5G Microcell Communications. IEEE Transactions on Antennas and Propagation 2019, 67, 4506 -4516.

AMA Style

Botao Feng, Lei Li, Jui-Ching Cheng, Chow-Yen-Desmond Sim. A Dual-Band Dual-Polarized Stacked Microstrip Antenna With High-Isolation and Band-Notch Characteristics for 5G Microcell Communications. IEEE Transactions on Antennas and Propagation. 2019; 67 (7):4506-4516.

Chicago/Turabian Style

Botao Feng; Lei Li; Jui-Ching Cheng; Chow-Yen-Desmond Sim. 2019. "A Dual-Band Dual-Polarized Stacked Microstrip Antenna With High-Isolation and Band-Notch Characteristics for 5G Microcell Communications." IEEE Transactions on Antennas and Propagation 67, no. 7: 4506-4516.