MIMO antenna system based on orthogonality of the characteristic modes of a mobile device

Chaudhury, S.K.; Schroeder, Werner L.; Chaloupka, H.

doi:10.1109/inica.2007.4353932

Cited by 24 publications

(11 citation statements)

References 4 publications

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“…Assuming the coupling impedance to increase close to the ground plane resonance (analogous to the variation of coupling impedance with dipole antenna length), it becomes clear that the excitation of chassis mode current will become maximum at chassis mode resonance where Z Ch is a minimum. It is also evident from (2) that an efficient excitation of the chassis mode current can be accomplished by exciting monopoles 1 and 2 in anti-phase (odd mode), which is consistent with the proposal of a MIMO antenna system in [5]. , yet with opposite sign.…”

Section: Modellingsupporting

confidence: 83%

“…[9], detune the chassis mode resonance frequency by modifications to the ground plane, e.g. [10], or instead use coupling of elements to orthogonal chassis modes, as already proposed in [5]. However, based on the theory of multi-port antennas, if we can tune the arrangement such that the antenna-ports are completely decoupled (as in the experimental case of L≈0.6λ ), the generated complex-valued vector radiation patterns are orthogonal such that a minimum antenna correlation factor is achieved as required for MIMO and diversity concepts.…”

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confidence: 99%

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

Solbach¹,

Famdie²

2007

2nd European Conference on Antennas and Propagation (EuCAP 2007)

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Feed point impedance and mutual coupling of monopole array elements on a small ground plane are found to depend critically on the ground plane size when one length dimension comes near to half-wavelength. This is demonstrated to be due to the excitation of the lowest order chassis mode, which acts as an additional radiator element parasitically coupled to the array elements. A model is given in terms of impedance matrix description of the array including the effect of excited chassis mode. Important consequences of the chassis mode excitation and coupling are formulated for the characteristics of phased arrays and for diversity-and MIMO concepts.

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Section: Modellingsupporting

confidence: 83%

mentioning

confidence: 99%

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

Solbach¹,

Famdie²

2007

2nd European Conference on Antennas and Propagation (EuCAP 2007)

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“…In 2007, it was first noted that since characteristic modes (CMs) provide mutually orthogonal radiation patterns, the efficient excitation of different modes by the antenna ports facilitates low correlation and hence optimal MIMO performance [2]. Based on this initial idea, TCM has since been applied to optimize antenna placement in predefined structures [3], [4], synthesize antennas with reconfigurable patterns [5], and help create more than one excitable mode at frequency bands below 1 GHz while also achieving multiband capability [3].…”

Section: Introductionmentioning

confidence: 99%

Tracking of characteristic modes through far-field pattern correlation

Miers

Lau

2015

2015 IEEE International Symposium on Antennas and Propagation &Amp; USNC/URSI National Radio Science Meeting

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Abstract-Recent developments in characteristic mode (CM) analysis enable a more systematic approach to designing multiantennas for mobile terminals. However, some of the advantages of developing antennas through CMs are based on accurate mode tracking over frequency. Existing tracking methods are primarily based on the tracking of eigencurrents over frequency, by which mode swapping and degenerate modes can occur. To solve these problems, a completely different method of tracking CM by means of far-field pattern correlation was recently developed and shown to work well for perfect electric conductors (PECs). This paper reveals that the same method can also substantially reduce tracking errors for structures with both PEC and dielectric materials, relative to state-of-the-art methods.

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“…. , N such that the radiation matrix and the scattering matrix of the resulting antenna system is invariant under certain permutations of port indices [3], [4]. The eigenvectors of the applicable permutation matrices are then simultaneously eigenvectors of the antenna's radiation matrix and of its scattering matrix thus allowing to design an N -port antenna system whose scattering matrix has N real and frequency independent eigenvectors.…”

Section: Introductionmentioning

confidence: 99%

On the design of wideband and tunable matching and decoupling networks for N-port antennas

Bouezzeddine

Schroeder

2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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This paper deals with the design of matching and decoupling network for a 4-port MIMO antenna system operating in the TV white spaces from 470 MHz to 790 MHz. After stating the limitations on the classical design based on hybrids, we consider a new approach in order to optimize the MIMO antenna performance, in terms of bandwidth, by taking advantage of some degrees of freedom in the matching and decoupling network. The maximum attainable bandwidth will be reported as a function of the network elements.

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MIMO antenna system based on orthogonality of the characteristic modes of a mobile device

Cited by 24 publications

References 4 publications

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

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

Tracking of characteristic modes through far-field pattern correlation

On the design of wideband and tunable matching and decoupling networks for N-port antennas

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