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A compact slot MIMO antenna for smartphones with metal housing

JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS 2018年第2期32卷 204-214页

作者： Wu, Di Hua, Xiaoxue Cheung, Sing Wai Wang, Bo Li, Min Xiao, Bing Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China

A compact slot multiple-input multiple-output antenna (CSMA) for smartphones with metal housing is proposed in this paper. The antenna has a slot radiator shared between two input ports and a T-shaped defect-ground slot (DGS) for decoupling. A function for selecting the best dimensions of the DGS for optimum decoupling is derived using the transmission theory. The CSMA antenna is designed using simulation to operate in the 2.4-GHz wireless-area-network (WLAN) system and then fabricated for measurement. Measured results show that the antenna has an impedance bandwidth (IMBW) of 2.4-2.48 GHz, mutual coupling from -19 to -29 dB and envelopecorrelation coefficient (ECC) below 0.0867 within the IMBW. The antenna is very easy to fabricate and is a potential candidate for the MIMO smartphones antennas with metal housing.

关键词： Mobile antenna metal housing multiple-input multiple-output antenna slot antenna

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FOUR antenna MIMO SYSTEM WITH COMPACT RADIATOR FOR MOBILE TERMINALS

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2015年第6期57卷 1281-1286页

作者： Huang, He Liu, Ying Gong, Shu-Xi Xidian Univ Sci & Technol Antenna & Microwave Lab Xian 710071 Peoples R China

A four-antenna multiple-input multiple-output (MIMO) system with the most compact radiators for small mobile terminals is presented in this letter. The MIMO antenna has four identical elements which are positioned in each corner of the PCB board. Each antenna element consists of an L-shaped radiator and two interdigital shorting stubs, producing the 2.4/5.2/5.8 GHz wireless local area network bands with a small size of only 6.5 x 9 mm(2). Two different isolation structures are introduced simultaneously to mitigate mutual coupling between various elements. Consequently, mutual coupling less than -15 dB at both lower and upper bands is achieved, leading to an envelope correlation coefficient (ECC) of less than 0.25. A prototype of the antenna has been fabricated and verified. Being equipped with small size, embeddable structure, good radiation performance, high isolation, and low ECC, the proposed antenna is very suitable for mobile terminals in wireless communication system. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1281-1286, 2015

关键词： envelope correlation coefficient multiple-input multiple-output antenna mutual coupling wireless local area network applications

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Compact MIMO antenna for LTE 2500 and UWB applications

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2015年第9期57卷 2046-2049页

作者： Wu, Yanjie Long, Yunliang Sun Yat Sen Univ Dept Elect & Commun Engn Guangzhou 510275 Guangdong Peoples R China SYSU CMU Shunde Int Joint Res Inst Shunde Guangdong Peoples R China

This letter presents a compact multiple-input multiple-output (MIMO) ultrawideband (UWB) antenna, and this MIMO antenna consists of two coplanar waveguide -fed monopole antenna elements and an improved ground-plane. These two antenna elements are symmetrically arranged on a FR4 substrate with dimensions 33.8 x 29 x 0.8 mm(3). The improved ground-plane has several ground stubs and windows, and they are applied as decoupling structure to improve the isolation as well as impedance matching. Simulation and measurement are used to study the antenna performance, results show that the antenna has a wide impedance bandwidth of 2.2-10.6 GHz with |S-11|-9 dB, low mutual coupling of less than -12 dB and -17 dB over the range of 2.5-4.2 GHz and 5.6-10 GHz, respectively, and LTE 2500 and UWB operation bands can be covered successfully. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2046-2049, 2015

关键词： multiple-input multiple-output ultrawideband antenna multiple-input multiple-output antenna wideband antenna

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Compact dual-band MIMO antenna for 4G USB dongle applications

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2012年第3期54卷 744-748页

作者： Li, Zuxing Han, Minseok Choi, Jaehoon Hanyang Univ Dept Elect & Comp Engn Seoul 133791 South Korea

An extremely compact dual-band MIMO antenna for 4G USB dongle applications is proposed for operation in the long term evolution (LTE) band 13 (0.746-0.787 GHz) and the M-WiMAX band (2.5-2.69 GHz).The proposed multiple-input multiple-output (MIMO) antenna consists of two identical elements, each of which is 15 x 13.25 mm(2). The minimum separation between the two elements is 0.5 mm (about 0.13% of the wavelength in free space at 0.765 GHz). Each antenna element of the proposed MIMO system is composed of a feeding strip, a spiral-like radiating strip, and an L-shaped parasitic strip. The radiating and L-shaped strips are short-circuited to the ground plane. The radiating and parasitic strips, which are capacitively coupled to the feeding strip, operate not only as radiators but also work as resonators to reduce the coupling between the two closely packed input ports. The proposed MIMO antenna has a measured port-to-port isolation performance of more than 13 dB over the frequency bands of interest. In addition, the ECCs are maintained below 0.3. (C) 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:744-748, 2012;View this article online at ***. DOI 10.1002/mop.26612

关键词： long term evolution multiple-input multiple-output antenna M-WiMAX port-to-port isolation USB dongle

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MULTIBAND MIMO antenna USING ORTHOGONALLY POLARIZED DIPOLE ELEMENTS FOR MOBILE COMMUNICATIONS

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2011年第9期53卷 2043-2048页

作者： Han, Minseok Choi, Jaehoon Hanyang Univ Dept Elect & Comp Engn Seoul 133791 South Korea

A multiband multiple-input multiple-output (MIMO) antenna using polarization diversity for next generation mobile communication is proposed. The MIMO antenna consists of two dual-band (0.75 GHz/2.5 GHz) dipole antennas with a separation distance of 0.8 mm. One dipole is etched on the top of a two-layered dielectric substrate with a dimension of 80 x 80 mm(2) and the other is printed on the bottom side of the same substrate. They are located orthogonal to one another. Even though the two stacked dipoles are separated by only 0.8 mm, the port-to-port isolation is maintained at greater than 20 dB, and the envelope correlation coefficient (ECC) of the two antennas is always lower than 0.2 over the entire frequency band. To evaluate the performance of the proposed antenna, key performance parameters such as the total efficiency, ECC, mean effective gain (MEG), MEG ratio, and actual diversity gain are analyzed. (C) 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2043-2048, 2011;View this article online at ***. DOI 10.1002/mop.26198

关键词： multiple-input multiple-output antenna isolation polarization diversity dipole long-term evolution mobile worldwide interoperability for microwave access

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DUAL-BAND MIMO antenna USING POLARIZATION DIVERSITY FOR 4G MOBILE HANDSET APPLICATION

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2011年第9期53卷 2075-2079页

作者： Han, Minseok Choi, Jaehoon Hanyang Univ Dept Elect & Comp Engn Seoul 133791 South Korea

A dual-band multiple-input multiple-output (MIMO) antenna using polarization diversity is proposed for a 4G mobile handset application. The proposed MIMO antenna consists of two printed dual-band PIFAs with a slotted strip. input port 1 of the first PIFA is orthogonally disposed with respect to input port 2 of the second PIFA. The orthogonal placement of the two feed points ensures that the dominant polarization of each of the PIFAs is opposite to each other, resulting in a good isolation performance. The proposed MIMO antenna has an isolation of similar to 17 dB at LTE band 13, and the envelope correlation coefficient (ECC) of the two antennas is always lower than 0.4 over all of LTE band 13. To evaluate the performance of the proposed antenna, key performance parameters such as the total efficiency, ECC, mean effective gain (MEG), MEG ratio, and actual diversity gain are analyzed. (C) 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2075-2079, 2011;View this article online at ***. DOI 10.1002/mop.26197

关键词： multiple-input multiple-output antenna isolation polarization diversity mobile handset LTE

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multiple antenna System for Mobile Handset Applications

Multiple Antenna System for Mobile Handset Applications

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IEEE International Symposium on antennas and Propagation (APSURSI)/USNC/URSI National Radio Science Meeting

作者： Kim, Juman Han, Minseok Lee, Changho Choi, Jaehoon Hanyang Univ Dept Elect & Comp Engn Seoul 133791 South Korea

ISBN: (纸本)9781424495610

A multiple antenna system for mobile handset application is proposed. The proposed multiple antenna system consists of planar inverted-F antenna (PIFA) for mobile operation and a shorted monopole MIMO antenna with a decoupling network for WLAN operation. By adding a lambda/4 open stub to PIFA, an additional resonance at 2 GHz band was generated and consequently the impedance matching characteristic was improved. In order to improve the isolation characteristic between the PIFA and MIMO antenna elements, each element is placed at the corner of each edge of the system ground. In addition, decoupling network was added at the feeding line of a shorted monopole antenna element. The proposed WLAN MIMO antenna has the isolations of about 15 dB at 2 GHz and 5.8 GHz bands while that at 5.2 GHz band is over 18 dB. It is observed that the antenna can cover GSM/DCS/PCS/UMTS and 2.4/5.2/5.8 GHz WLAN service, simultaneously.)

关键词： multiple-input multiple-output antenna Decoupling Network planar inverted-F antenna Mobile antenna Isolation WLAN

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multiple antenna System for Mobile Handset Applications

Multiple Antenna System for Mobile Handset Applications

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2011 IEEE International Symposium on antennas and Propagation(APSURSI 2011)

作者： Juman Kim Minseok Han Changho Lee Jaehoon Choi Department of Electrical and Computer Engineering Hanyang University Seoul Republic of Korea

ISBN: (纸本)9781424495627;9781424495634

关键词： multiple-input multiple-output antenna Decoupling Network planar inverted-F antenna Mobile antenna Isolation WLAN antenna SYSTEM planar inverted-F antennas decoupling network multiple antenna Mobile phones antenna antennae FEED LINE antenna element wireless local area network (WLAN) multiple input multiple output systems corners

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MIMO antenna USING A DECOUPLING NETWORK FOR 4G USB DONGLE APPLICATION

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2010年第11期52卷 2551-2554页

作者： Han, Minseok Choi, Jaehoon Hanyang Univ Dept Elect & Comp Engn Seoul 133791 South Korea

A compact MIMO antenna using a decoupling network for 4G USB dongle application is proposed. The proposed MIMO antenna consists of two parallel folded monopole antennas with the length of 100 mat and a decoupling network. To improve the isolation characteristic at the LTE band 13, a decoupling network was added between the two antennas placed close to each other. The decoupling network is simple and compact and consists of two sections of transmission line, a shunt reactive component and quarter-wavelength jointed shorting structure. The proposed MIMO antenna has the isolation less than -15 dB at the LTE band 13 and the ECC is lower than 0.4 over the whole LTE band. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2551-2554, 2010;View this article online at ***. DOI 10.1002/mop.25551

关键词： multiple-input multiple-output antenna isolation decoupling network USB dongle LTE

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MIMO antenna System Optimization for Mobile Applications Using Equivalent Infinitesimal Dipoles

MIMO Antenna System Optimization for Mobile Applications Usi...

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2010 IEEE International Symposium antennas and Propagation/CNC-USNC/URSI Radio Science Meeting

作者： Karimkashi, Shaya Kishk, Ahmed A. Kajfez, Darko Univ Mississippi Dept Elect Engn Ctr Appl Electromagnet Syst Res University MS 38677 USA

ISBN: (纸本)9781424449682

In this paper, a very fast and accurate technique based on Infinitesimal Dipole Model (IDM) is used to minimize the correlation between two small F antenna elements. In this technique, a set of infinitesimal dipoles is used to represent each antenna element. Then, by using this model, the optimal location and orientation of each element is found to achieve the minimum correlation between antennas. It is shown that this technique is very accurate and efficient in computing the correlation between antennas compared to previous works.

关键词： MIMO antenna system optimization MIMO communication dipole antennas equivalent infinitesimal dipole infinitesimal dipole model mobile application mobile radio multiple-input multiple-output antenna planar inverted-F antennas small F antenna element

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