On Small Terminal MIMO Antennas, Harmonizing Characteristic Modes With Ground Plane Geometry

Szini, I.; Tatomirescu, Alexandru; Pedersen, Gert Frølund

doi:10.1109/tap.2015.2398111

Cited by 46 publications

(24 citation statements)

References 40 publications

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“…TCM brings a clearer insight into an antenna's physical behavior independent of the feeding arrangement by identifying the eigenmodes (characteristic modes) of the antenna structure. The handset antennas described in references [11][12][13] were analyzed using TCM to better adjust the antenna structure to make the antenna resonate at a certain frequency with high efficiency-up to 60%. Also, Sharma and Shanmugam employed a novel wideband modified Archimedean spiral antenna without a ground plane using TCM; hence, its radiation patterns are bidirectional as it radiates simultaneously in both directions [14].…”

Section: Of 10mentioning

confidence: 99%

“…The detailed parameters are tabulated in Table 1. The theory of characteristic modes (TCM) for antenna application has been studied recently to better understand the radiation principle [11][12][13][14][15][16][17][18][19][20][21][22]. TCM brings a clearer insight into an antenna's physical behavior independent of the feeding arrangement by identifying the eigenmodes (characteristic modes) of the antenna structure.…”

Section: Of 10mentioning

confidence: 99%

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Design of a T-Shaped Antenna Based on Characteristic Mode Manipulation for Metal-Framed Handset Application

et al. 2018

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Recently, metal-framed handset antennas have aroused much attention due to their fantastic appearance and superior robustness. In this paper, a T-shaped antenna suitable for integration with a USB connector is proposed for metal-framed handset application by utilizing the theory of characteristic modes (TCM). Five eigenmodes, one for the lower band and four for the higher band, were merged by a T-shaped metal frame, a feed point, and two shorting pins, as well as three radio frequency (RF) switches so as to broaden the antenna's operating bandwidth. A prototype was fabricated in order to verify the design concept. Experimental results showed that the proposed antenna was able to cover bandwidths of 0.824-0.960 GHz (GSM band) and 1.710-2.690 GHz (DCS, PCS, UMTS, and LTE bands) with an acceptable radiation efficiency of up to 50% and satisfactory radiation patterns.

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Section: Of 10mentioning

confidence: 99%

Section: Of 10mentioning

confidence: 99%

Design of a T-Shaped Antenna Based on Characteristic Mode Manipulation for Metal-Framed Handset Application

et al. 2018

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“…Metal rim of mobile device was utilized to control the orthogonal characteristic modes of the ground plane for MIMO operation in [24]. In [25], the authors applied characteristic mode theory to generate harmonized orthogonal radiation modes for MIMO operation. Characteristic modes can also be utilized to design patten reconfigurable MIMO antennas for mobile devices [26,27].…”

Section: Introductionmentioning

confidence: 99%

Decoupler Design for Mimo Antennas of Usb Dongle Applications Using Ground Mode Coupling Analysis

Zahid¹,

Qu²,

Kim³

et al. 2018

PIER M

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In this paper, the impact of decoupler type has been analyzed on the performance of planar inverted-F antenna (PIFA)-based multiple-input multiple-output (MIMO) antenna. A T-type and a loop-type decoupler have been employed for the isolation of the MIMO antennas, and the performances of the two cases have been compared. The decouplers have been selected based on their different coupling mechanisms with the dominant ground mode. The antennas have been designed for the ground configuration of a USB dongle operating at 2.45 GHz band. Characteristic mode analysis of the ground plane has been carried out, and the MIMO systems have been analysed based on the coupling among the antenna, decoupler and the dominant characteristic mode of the ground plane. It has been observed that the coupling between the decoupler and the ground mode significantly affects the radiation efficiency as well as the diversity performance of the MIMO antenna.

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“…It is difficult to develop antennas in a compact area while achieving high isolation. Various decoupling methods have been reported for achieving miniaturization and high isolation, including using a neutralization line or an additional decoupling resonator (eg, strip, slot), and the adoption of characteristic mode. However, the antenna structures in the previous studies occupy a large area with additional decoupling structures and ground plane, which is difficult to implement in smart glass applications.…”

Section: Introductionmentioning

confidence: 99%

Compact MIMO antenna for application to smart glasses using T‐shaped ground plane

Ryu

Kim

2018

Micro & Optical Tech Letters

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A compact multiple‐input multiple‐output (MIMO) antenna design for application to smart glasses is proposed in this letter. The proposed MIMO antenna system is comprised of two symmetrical meander antennas operating in the 2.4‐GHz wireless local area network band and a T‐shaped ground for high isolation. The operation mechanism of the proposed MIMO antennas can be explained using the analysis of a three‐port network. Accordingly, the T‐shaped ground plane operates as a decoupling structure such that the isolation between antennas can be controlled by tuning the T‐shaped ground plane. The reflection coefficient characteristic was measured to be less than −7.5 dB, whereas the isolation obtained was higher than 15 dB. The diversity performance was evaluated using the measured three‐dimensional radiation patterns, and the envelope correlation coefficients in the target band were less than 0.1.

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On Small Terminal MIMO Antennas, Harmonizing Characteristic Modes With Ground Plane Geometry

Cited by 46 publications

References 40 publications

Design of a T-Shaped Antenna Based on Characteristic Mode Manipulation for Metal-Framed Handset Application

Design of a T-Shaped Antenna Based on Characteristic Mode Manipulation for Metal-Framed Handset Application

Decoupler Design for Mimo Antennas of Usb Dongle Applications Using Ground Mode Coupling Analysis

Compact MIMO antenna for application to smart glasses using T‐shaped ground plane

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