Analysis and design of antennas for wireless communications using modal methods

Antonino‐Daviu, Eva

doi:10.4995/thesis/10251/2188

Cited by 8 publications

(5 citation statements)

References 84 publications

(112 reference statements)

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“…This is consistent with simulations results as the two set of CMs converge to resonant frequencies of the single loop antenna, which are 1.65 GHz and 3.25 GHz. Based on different approaches, the existence of these antenna modes and transmission line modes is very important [15]. As seen in Fig.…”

Section: B Analysis Of the Coupling Behavior Based On Tcmmentioning

confidence: 99%

“…As Characteristic Mode Analysis (CMA) provides an excitation-independent method to analyze electromagnetic properties of arbitrary shaped metallic structures [14], [15], the Theory of Characteristic Modes (TCM) is a favorable tool to investigate the coupling behavior between two loop antennas based on Modal Analysis (MA). Using the impedance matrix Z of the Method of Moments of a perfectly conducting body, TCM generates Characteristic Modes (CMs) with their associated properties.…”

Section: Introductionmentioning

confidence: 99%

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Power Transfer Efficiency Analyzed using Characteristic Mode Coupling Between Two Parallel Loops

Abderrazak

Antonino‐Daviu

Ferrando‐Bataller

2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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Independently of any electrical contact, running electronic devices such as smartphones, smart watches, RFID tags etc., is now attainable over small and large distances through Wireless Power Transfer technology. Although, designing systems maintaining appreciable power transfer efficiency still not always achievable. Using two parallel loops, the Theory of Characteristic Modes provides physical insight into the power transfer efficiency. Furthermore, to reach straightforward maximization of the modal power transfer efficiency, the focus of this paper is analyzing the impact of the separation distance and the overlapping between the two antennas on the characteristic modes and their contribution in the total efficiency of the power. The study considers different positions and frequencies of the two parallel antennas.

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Section: B Analysis Of the Coupling Behavior Based On Tcmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power Transfer Efficiency Analyzed using Characteristic Mode Coupling Between Two Parallel Loops

Abderrazak

Antonino‐Daviu

Ferrando‐Bataller

2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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“…The CMA is a very useful tool that has received wide attention in recent years due to the physical insights about the electromagnetic properties of a radiating structure that the analysis provides. It has been successfully applied to antenna pattern synthesis [38][39][40], design of decoupling methods [41], and the general improvement of MIMO antenna systems [42,43].…”

Section: Characteristic Mode Analysismentioning

confidence: 99%

Characteristic mode analysis applied to reduce the mutual coupling of a four‐element patch MIMO antenna using a defected ground structure

Fritz‐Andrade

Miguel

Gómez‐Villanueva

et al. 2019

IET Microwaves, Antennas & Propagation

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A multiple‐input–multiple‐output (MIMO) microstrip patch antenna array of four elements is proposed to cover the 5.8 GHz WLAN band. The characteristic mode analysis is carried out to design a defected ground structure that improves the MIMO performance without impacting negatively the radiation characteristics of the four‐element array. Simulations and measurements demonstrate that the implemented prototype reaches a maximum mutual coupling of −32 dB and a gain‐per‐element of 5.3 dB with good MIMO attributes, surpassing many other proposals in the antenna literature: maximum envelope correlation coefficient of 0.0001, diversity gain very close to 10 dB, capacity loss false(Clossfalse) near to 0.0023 bps/Hz at the resonant frequency, multiplexing efficiency )(ηmunormalxij of 0.935, and a total active reflection coefficient weakly dependent on the excitation phases. The presented design is proposed for operation on the IEEE 802.11a/n standard.

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“…An exact analytical solution for characteristic currents is exceedingly complicated with only two bodies of finite extent already known, one of them being a spherical shell [23]. However, the expression (9) permits the definition of an arbitrary current distribution J without the necessity of numerically computing the impedance matrix Z and its decomposition in (4).…”

Section: Derivation Of the Functionalmentioning

confidence: 99%

Analytical Representation of Characteristic Mode Decomposition

Čapek

Hazdra

Mášek

et al. 2017

IEEE Trans. Antennas Propagat.

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Aspects of the theory of characteristic modes, based on their variational formulation, are presented and an explicit form of a related functional, involving only currents in a spatial domain, is derived. The new formulation leads to deeper insight into the modal behavior of radiating structures as demonstrated by a detailed analysis of three canonical structures: a dipole, an array of two dipoles and a loop, cylinder and a sphere. It is demonstrated that knowledge of the analytical functional can be utilized to solve important problems related to the theory of characteristic modes decomposition such as the resonance of inductive modes or the benchmarking of method of moments code.

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Analysis and design of antennas for wireless communications using modal methods

Cited by 8 publications

References 84 publications

Power Transfer Efficiency Analyzed using Characteristic Mode Coupling Between Two Parallel Loops

Power Transfer Efficiency Analyzed using Characteristic Mode Coupling Between Two Parallel Loops

Characteristic mode analysis applied to reduce the mutual coupling of a four‐element patch MIMO antenna using a defected ground structure

Analytical Representation of Characteristic Mode Decomposition

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