Mutual coupling and chassis-mode coupling in small phased array on a small ground plane

Solbach, Klaus; Famdie, Celestin Tamgue

doi:10.1049/ic.2007.1601

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…If the frequency decreases, the dimensions of these decoupling structures will increase correspondingly, and they can take too much space on the PCBs. Even more importantly, the mobile chassis, which only functions as a ground plane for the antenna elements at high frequency band, becomes the main radiator at the low frequency bands [11]. Thus, different antenna elements share the same radiator, making isolation worse (e.g., the prototype in [12]).…”

mentioning

confidence: 99%

Characteristic Mode Based Tradeoff Analysis of Antenna-Chassis Interactions for Multiple Antenna Terminals

Tan

Lau

et al. 2012

IEEE Trans. Antennas Propagat.

149

134

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The design of multiple antennas in compact mobile terminals is a significant challenge, due to both practical and fundamental design tradeoffs. In this paper, fundamental antenna design tradeoffs of multiple antenna terminals are presented in the framework of characteristic mode analysis. In particular, interactions between the antenna elements and the characteristic modes and their impact on design tradeoffs are investigated in both theory and simulations. The results reveal that the characteristic modes play an important role in determining the optimal placement of antennas for low mutual coupling. Moreover, the ability of antenna elements to localize the excitation currents on the chassis can significantly influence the final performance. To demonstrate the effectiveness of the proposed approach, a dual-band, dual-antenna terminal is designed to provide an isolation of over 10 dB for the 900 MHz band without additional matching or decoupling structures. A tradeoff analysis of bandwidth, efficiency, effective diversity gain and capacity is performed over different antenna locations. Finally, three fabricated prototypes verify the simulation results for representative cases. Index Terms-Antenna array mutual coupling, MIMO systems, mobile communication I. INTRODUCTION HE phenomenal success of multiple-input multiple-output (MIMO) technology can be seen in its critical role of enabling high data rates in Long Term Evolution (LTE), Worldwide Interoperability for Microwave Access (WiMAX) and IEEE802.11n. The key advantage of MIMO is its potential to linearly increase channel capacity with the number of Manuscript received June 1, 2010.

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mentioning

confidence: 99%

Characteristic Mode Based Tradeoff Analysis of Antenna-Chassis Interactions for Multiple Antenna Terminals

Tan

Lau

et al. 2012

IEEE Trans. Antennas Propagat.

149

134

View full text Add to dashboard Cite

show abstract

“…The second maximum electric field is, however, on the opposite side of chassis, and the weakest electric field is almost in the center of the chassis. The trend of the total electric field is similar to that of a chassis without the slot monopole, which can be regarded as a flat half-wavelength dipole [3]. Thus, the chassis is efficiently excited.…”

Section: Characteristic Mode Analysismentioning

confidence: 71%

“…To our understanding, the main reason is that the mobile chassis (typically around 100 mm × 40 mm in size), which only functions as a ground plane for the antenna elements at high frequency bands, becomes the main radiator at the (low) frequency bands that are below 1 GHz [3]. This means that different antenna elements share the same radiator at the low bands, which increases mutual coupling (e.g., as seen in the dualantenna prototype in [4]) and further complicates any effort to decouple them.…”

Section: Introductionmentioning

confidence: 99%

Optimal multiple antenna design for compact MIMO terminals with ground plane excitation

Lau

Ying

2011

2011 International Workshop on Antenna Technology (iWAT)

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ABSTRACT:The compactness of mobile terminals complicates the design of multiple antennas, since coupling among the antennas increases when they are placed in proximity of one another. While it is possible to mitigate coupling between closely spaced antennas, a tradeoff in bandwidth is required. In this paper, we highlight ground plane excitation as an additional dimension to consider in the design of multiple antenna terminals. This is because a compact ground plane, especially in mobile application, can interact with the antenna elements and contribute significantly to their radiation characteristics. Our results show that several design parameters, namely element locations, spacing between elements, and radiation characteristics of individual elements, must be jointly considered in order to achieve the optimal MIMO performance tradeoff for compact multiple antenna terminals.

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“…It is also known from mobile phone antenna design that a radiator can excite "chassis modes" on the ground plane which can lead to impedance and bandwidth changes varying quasiperiodically with the size of the ground plane in a period of λ 0 /2, e.g. [3], [4].…”

Section: B Top-loaded Monopolesmentioning

confidence: 99%

Study of Monopole Radiators for Planar Circuit Integration

Orellana

Solbach

2008

2008 38th European Microwave Conference

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Communication terminals for WLAN and similar systems require omni-directional antennas which can be used as a single radiator or in array and MIMO arrangements. The paper proposes to use low-profile top-loaded monopole and toploaded folded monopole radiators and the integration into planar circuits where the radiators are directly fed (without a launcher) by microstrip line. The design and performance of both types is investigated in a simulation study and by experiment. High relative bandwidth of 25% is achieved for the folded monopole type with a height over ground as low as 0.09 free space wavelength.

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Mutual coupling and chassis-mode coupling in small phased array on a small ground plane

Cited by 8 publications

References 10 publications

Characteristic Mode Based Tradeoff Analysis of Antenna-Chassis Interactions for Multiple Antenna Terminals

Characteristic Mode Based Tradeoff Analysis of Antenna-Chassis Interactions for Multiple Antenna Terminals

Optimal multiple antenna design for compact MIMO terminals with ground plane excitation

Study of Monopole Radiators for Planar Circuit Integration

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