The Experts below are selected from a list of 28734 Experts worldwide ranked by ideXlab platform
Nam Kim - One of the best experts on this subject based on the ideXlab platform.
-
Isolation Enhancement of a Metasurface-Based MIMO Antenna Using Slots and Shorting Pins
IEEE Access, 2021Co-Authors: Md. Abu Sufian, Niamat Hussain, Hussain Askari, Seong Gyoon Park, Kook Sun Shin, Nam KimAbstract:In this paper, a metasurface-based multiple-input multiple-output (MIMO) Antenna with high isolation between Antenna Elements is presented. The main patch radiator is sandwiched between a metasurface and a ground plane to achieve performance enhancement. The fabricated single Element Antenna has a compact size of $0.85\lambda _{0} \times 0.85\lambda _{0} \times 0.038\lambda _{0}$ . The Antenna exhibits a wideband operational bandwidth from 3.27 to 3.82 GHz for $\vert \text{S}_{11}\vert < -10$ , which corresponds to a fractional bandwidth of 15.5%. Moreover, stable radiation patterns with a peak gain of 8.1 dBi are also achieved across the operating band. The proposed single Element Antenna is characterized for $2 \times 2$ MIMO system by translating each Antenna Element orthogonal to each other. A decoupling structure consisting of slots and metallic strip with shorting pins is used to improve the isolation between the MIMO Elements. The shorting pins connect the metallic strips (located between MIMO Elements) on the metasurface and ground plane. These slots on ground plane and shorting pins affect the electromagnetic field distribution and consequently reduce the mutual coupling. The fabricated MIMO Antenna has a compact size of $1.75\lambda _{0}\times 1.75\lambda _{0} \times 0.038\lambda _{0}$ . The proposed 4 port ( $2\times 2$ ) MIMO Antenna provides 15.9% of 10 dB impedance bandwidth from 3.3 to 3.87 GHz with a peak gain of 8.72 dBi. Moreover, the proposed MIMO Antenna offers excellent diversity performance, isolation between Antenna Elements is very high (>32dB), ECC is lower than 0.001, and diversity gain is 9.99 dB very close to the ideal value of 10dB. Owing to these features, the proposed MIMO Antenna can be a good candidate for 5G Sub-6 GHz (n78 band) smart devices and sensors.
-
Isolation Enhancement of a Metasurface-Based MIMO Antenna Using Slots and Shorting Pins
'Institute of Electrical and Electronics Engineers (IEEE)', 2021Co-Authors: Md. Abu Sufian, Niamat Hussain, Hussain Askari, Seong Gyoon Park, Kook Sun Shin, Nam KimAbstract:In this paper, a metasurface-based multiple-input multiple-output (MIMO) Antenna with high isolation between Antenna Elements is presented. The main patch radiator is sandwiched between a metasurface and a ground plane to achieve performance enhancement. The fabricated single Element Antenna has a compact size of $0.85\lambda _{0} \times 0.85\lambda _{0} \times 0.038\lambda _{0}$ . The Antenna exhibits a wideband operational bandwidth from 3.27 to 3.82 GHz for $\vert \text{S}_{11}\vert < -10$ , which corresponds to a fractional bandwidth of 15.5%. Moreover, stable radiation patterns with a peak gain of 8.1 dBi are also achieved across the operating band. The proposed single Element Antenna is characterized for $2 \times 2$ MIMO system by translating each Antenna Element orthogonal to each other. A decoupling structure consisting of slots and metallic strip with shorting pins is used to improve the isolation between the MIMO Elements. The shorting pins connect the metallic strips (located between MIMO Elements) on the metasurface and ground plane. These slots on ground plane and shorting pins affect the electromagnetic field distribution and consequently reduce the mutual coupling. The fabricated MIMO Antenna has a compact size of $1.75\lambda _{0}\times 1.75\lambda _{0} \times 0.038\lambda _{0}$ . The proposed 4 port ( $2\times 2$ ) MIMO Antenna provides 15.9% of 10 dB impedance bandwidth from 3.3 to 3.87 GHz with a peak gain of 8.72 dBi. Moreover, the proposed MIMO Antenna offers excellent diversity performance, isolation between Antenna Elements is very high (>32dB), ECC is lower than 0.001, and diversity gain is 9.99 dB very close to the ideal value of 10dB. Owing to these features, the proposed MIMO Antenna can be a good candidate for 5G Sub-6 GHz (n78 band) smart devices and sensors
-
Isolation Enhancement of a Metasurface-Based MIMO Antenna Using Slots and Shorting Pins
IEEE Access, 2024Co-Authors: Md. Abu Sufian, Niamat Hussain, Hussain Askari, Seong Gyoon Park, Kook Sun Shin, Nam KimAbstract:In this paper, a metasurface-based multiple-input multiple-output (MIMO) Antenna with high isolation between Antenna Elements is presented. The main patch radiator is sandwiched between a metasurface and a ground plane to achieve performance enhancement. The fabricated single Element Antenna has a compact size of 0.85λ0 × 0.85λ0 × 0.038λ0. The Antenna exhibits a wideband operational bandwidth from 3.27 to 3.82 GHz for |S11| 32dB), ECC is lower than 0.001, and diversity gain is 9.99 dB very close to the ideal value of 10dB. Owing to these features, the proposed MIMO Antenna can be a good candidate for 5G Sub-6 GHz (n78 band) smart devices and sensors.
Zhenghe Feng - One of the best experts on this subject based on the ideXlab platform.
-
a wideband compact wlan wimax mimo Antenna based on dipole with v shaped ground branch
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Han Wang, Zhijun Zhang, Longsheng Liu, Zhenghe FengAbstract:A wideband printed dipole with V-shaped ground branches is proposed, which is designed for multiple-input multiple-output (MIMO) Antennas. It is based on a dipole with an integrated balun, and V-shaped ground branches are introduced to improve the impedance matching. The bandwidth of this Element reaches 62.3% (2.30–4.40 GHz), which covers all three WiMAX bands (2.30, 2.50, and 3.30 GHz) and the 2.40 GHz WLAN band. Based on this Element, a quad-Element MIMO Antenna is designed and fabricated. By reusing the V-shaped ground structure between adjacent Elements, the size of this quad-Element Antenna is only $0.31 \lambda \times 0.31\lambda \times 0.01\lambda $ . Meanwhile, a bandwidth of 60.6% (2.30–4.30 GHz) is achieved, in which the ${{\rm{S}}_{11}} , ${{\rm{S}}_{12}} , and ${{\rm{S}}_{13}} . Directional radiation patterns with 2.1 dBi average gain are attained, which are very stable throughout this band. This Antenna system can be suitable for multiElement MIMO devices such as wireless routers and adapters.
-
a low cost dual polarized array Antenna etched on a single substrate
IEEE Antennas and Wireless Propagation Letters, 2013Co-Authors: Xiaolei Jiang, Zhijun Zhang, Zijian Tian, Zhenghe FengAbstract:In this letter, a four-leaf clover slot Element Antenna, which has a planar feeding structure, is proposed for dual-polarization applications. A four-Element array based on the proposed Antenna is designed and measured. The feeding network and radiators of the array are on the same substrate, which results in low-cost and convenient fabrication. The bandwidths of two polarizations are 275 and 465 MHz, respectively. The isolation between the two ports is greater than 30 dB, and the front-to-back ratio is higher than 25 dB.
-
Pattern and Polarization Diversity Antenna With High Isolation for Portable Wireless Devices
IEEE Antennas and Wireless Propagation Letters, 2009Co-Authors: Xin Wang, Zhenghe FengAbstract:A compact two-Element Antenna with both pattern and polarization diversities and high isolation for 2.4 GHz WLAN application is reported. The Antenna is composed of a low-profile monopole and a pair of inverted-L Antennas fed by 180deg out-of-phase excitations. A prototype is fabricated and the measured S-parameters and radiation patterns are presented. The measured isolation is better than 29 dB across the required bandwidth. The envelope correlation coefficient, the mean effective gains and the diversity gain are calculated to evaluate the diversity potential of the proposed Antenna.
Md. Abu Sufian - One of the best experts on this subject based on the ideXlab platform.
-
Isolation Enhancement of a Metasurface-Based MIMO Antenna Using Slots and Shorting Pins
IEEE Access, 2021Co-Authors: Md. Abu Sufian, Niamat Hussain, Hussain Askari, Seong Gyoon Park, Kook Sun Shin, Nam KimAbstract:In this paper, a metasurface-based multiple-input multiple-output (MIMO) Antenna with high isolation between Antenna Elements is presented. The main patch radiator is sandwiched between a metasurface and a ground plane to achieve performance enhancement. The fabricated single Element Antenna has a compact size of $0.85\lambda _{0} \times 0.85\lambda _{0} \times 0.038\lambda _{0}$ . The Antenna exhibits a wideband operational bandwidth from 3.27 to 3.82 GHz for $\vert \text{S}_{11}\vert < -10$ , which corresponds to a fractional bandwidth of 15.5%. Moreover, stable radiation patterns with a peak gain of 8.1 dBi are also achieved across the operating band. The proposed single Element Antenna is characterized for $2 \times 2$ MIMO system by translating each Antenna Element orthogonal to each other. A decoupling structure consisting of slots and metallic strip with shorting pins is used to improve the isolation between the MIMO Elements. The shorting pins connect the metallic strips (located between MIMO Elements) on the metasurface and ground plane. These slots on ground plane and shorting pins affect the electromagnetic field distribution and consequently reduce the mutual coupling. The fabricated MIMO Antenna has a compact size of $1.75\lambda _{0}\times 1.75\lambda _{0} \times 0.038\lambda _{0}$ . The proposed 4 port ( $2\times 2$ ) MIMO Antenna provides 15.9% of 10 dB impedance bandwidth from 3.3 to 3.87 GHz with a peak gain of 8.72 dBi. Moreover, the proposed MIMO Antenna offers excellent diversity performance, isolation between Antenna Elements is very high (>32dB), ECC is lower than 0.001, and diversity gain is 9.99 dB very close to the ideal value of 10dB. Owing to these features, the proposed MIMO Antenna can be a good candidate for 5G Sub-6 GHz (n78 band) smart devices and sensors.
-
Isolation Enhancement of a Metasurface-Based MIMO Antenna Using Slots and Shorting Pins
'Institute of Electrical and Electronics Engineers (IEEE)', 2021Co-Authors: Md. Abu Sufian, Niamat Hussain, Hussain Askari, Seong Gyoon Park, Kook Sun Shin, Nam KimAbstract:In this paper, a metasurface-based multiple-input multiple-output (MIMO) Antenna with high isolation between Antenna Elements is presented. The main patch radiator is sandwiched between a metasurface and a ground plane to achieve performance enhancement. The fabricated single Element Antenna has a compact size of $0.85\lambda _{0} \times 0.85\lambda _{0} \times 0.038\lambda _{0}$ . The Antenna exhibits a wideband operational bandwidth from 3.27 to 3.82 GHz for $\vert \text{S}_{11}\vert < -10$ , which corresponds to a fractional bandwidth of 15.5%. Moreover, stable radiation patterns with a peak gain of 8.1 dBi are also achieved across the operating band. The proposed single Element Antenna is characterized for $2 \times 2$ MIMO system by translating each Antenna Element orthogonal to each other. A decoupling structure consisting of slots and metallic strip with shorting pins is used to improve the isolation between the MIMO Elements. The shorting pins connect the metallic strips (located between MIMO Elements) on the metasurface and ground plane. These slots on ground plane and shorting pins affect the electromagnetic field distribution and consequently reduce the mutual coupling. The fabricated MIMO Antenna has a compact size of $1.75\lambda _{0}\times 1.75\lambda _{0} \times 0.038\lambda _{0}$ . The proposed 4 port ( $2\times 2$ ) MIMO Antenna provides 15.9% of 10 dB impedance bandwidth from 3.3 to 3.87 GHz with a peak gain of 8.72 dBi. Moreover, the proposed MIMO Antenna offers excellent diversity performance, isolation between Antenna Elements is very high (>32dB), ECC is lower than 0.001, and diversity gain is 9.99 dB very close to the ideal value of 10dB. Owing to these features, the proposed MIMO Antenna can be a good candidate for 5G Sub-6 GHz (n78 band) smart devices and sensors
-
Isolation Enhancement of a Metasurface-Based MIMO Antenna Using Slots and Shorting Pins
IEEE Access, 2024Co-Authors: Md. Abu Sufian, Niamat Hussain, Hussain Askari, Seong Gyoon Park, Kook Sun Shin, Nam KimAbstract:In this paper, a metasurface-based multiple-input multiple-output (MIMO) Antenna with high isolation between Antenna Elements is presented. The main patch radiator is sandwiched between a metasurface and a ground plane to achieve performance enhancement. The fabricated single Element Antenna has a compact size of 0.85λ0 × 0.85λ0 × 0.038λ0. The Antenna exhibits a wideband operational bandwidth from 3.27 to 3.82 GHz for |S11| 32dB), ECC is lower than 0.001, and diversity gain is 9.99 dB very close to the ideal value of 10dB. Owing to these features, the proposed MIMO Antenna can be a good candidate for 5G Sub-6 GHz (n78 band) smart devices and sensors.
Koichi Ito - One of the best experts on this subject based on the ideXlab platform.
-
Reducing mutual coupling of MIMO Antennas with parasitic Elements for mobile terminals
IEEE Transactions on Antennas and Propagation, 2012Co-Authors: Zhengyi Li, Zheng-wei Du, Kazuyuki Saito, Masaharu Takahashi, Koichi ItoAbstract:Mutual coupling is a critical problem in the design of MIMO Antennas because it deteriorates the performance of MIMO systems, which not only affects the Antenna efficiency but also influences the correlation. Therefore, in this paper, using parasitic Elements to reduce mutual coupling is studied. By adding parasitic Elements a double-coupling path is introduced and it can create a reverse coupling to reduce mutual coupling. As an example, a dual-slot-Element Antenna with parasitic monopoles for mobile terminals is described. The discussion on channel capacity shows that the Antenna can be considered as a good candidate for MIMO systems. Furthermore, based on the study of current distributions, it is concluded that the technique is sensitive to relative positions between parasitic Elements, and relative positions between active Element and parasitic Element. Finally, we also extend the technique to a tri-Element Antenna.
Kwok-keung M. Cheng - One of the best experts on this subject based on the ideXlab platform.
-
MIMO Antenna Design with Reconfigurable Radiation Pattern and High Port Isolation
2020 50th European Microwave Conference (EuMC), 2021Co-Authors: Yi-feng Cheng, Kwok-keung M. ChengAbstract:A novel design approach for two-Element Antenna array with reconfigurable radiation patterns, high port isolation and low return loss is presented. The proposed Antenna system can offer switchable radiation patterns with simple circuit and control scheme. Furthermore, closed-form explicit formulas are readily available for the evaluation of the circuit parameters and the resultant radiation patterns. For validation, a slot Antenna array with small Element-spacing is prototyped and characterized. Experimental results reveal that the proposed method can provide adaptive pattern diversity with excellent port isolation and return loss performance.
-
a novel dual band decoupling and matching technique for asymmetric Antenna arrays
IEEE Transactions on Microwave Theory and Techniques, 2018Co-Authors: Yi-feng Cheng, Kwok-keung M. ChengAbstract:A novel dual-band decoupling and matching technique for asymmetric two-Element Antenna arrays is proposed. Decoupling and matching at two widely separated frequencies is accomplished by using a two-layer (level) network approach. Unlike previous works, analytical solution is readily available and prematching of the radiating Elements is no longer required. Simulation and experimental results show that the proposed method can offer improved port isolation and input return loss, enhanced efficiency, and increased radiation pattern diversity in both frequency bands.
