Time Domain Characteristic Mode Analysis for Transmission Problems

Wu, Qi; Wen, Zhongkui

doi:10.1109/ojap.2020.3008292

Cited by 3 publications

(6 citation statements)

References 29 publications

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“…Following Harrington's and Mautz' seminal work [4], it has found far more popular application today in the analysis and design of resonant antennas. Moreover, attempts are being made to extend CMA to other fields of application, e.g., time-domain analysis [31] and electrically large structure analysis [16]. However, it is safe to say that CMA is not expected to be well suited for every electromagnetic problem under the sun.…”

Section: Common Mythsmentioning

confidence: 99%

Characteristic Modes: Progress, overview, and emerging topics

Lau

Čapek

Hassan

2022

IEEE Antennas Propag. Mag.

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Over the past decade, characteristic mode analysis (CMA) research has grown from a niche topic to a mainstream topic, warranting a tutorial-style special issue to survey the significant progress that has been made in this field. In this introductory article (PAPER 1), the focus is on providing the big picture. We start with a simple description of characteristic modes. Next, we examine the trends in this field, followed by providing further insights into CMA's historical development. We will also address common myths surrounding the subject. Then, leaving the detailed coverage of major topics to the following papers, we summarize recent applications of CMA in scattering and other emerging topics. Finally, we conclude with some future perspectives on this field.

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Section: Common Mythsmentioning

confidence: 99%

Characteristic Modes: Progress, overview, and emerging topics

Lau

Čapek

Hassan

2022

IEEE Antennas Propag. Mag.

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“…This result may help understanding the transient behaviors of DAM systems, which show another potential application of TD‐CMA. Recently, a strict TD‐CMA formulation was developed for general transmission problems, in which the impulse response between two transmission ports is decomposed into a linear superposition of modal impulse response (MIR) [ 11 ] . Theoretic and numerical results verified the physical information carried by this method for various guided‐ and radiated‐wave transmission mechanisms [ 11 ] .…”

Section: Introductionmentioning

confidence: 99%

“…A similar approach was proposed to analyze the time domain behavior of direct antenna modulation (DAM) systems [10] . Eigenpatterns of a thin dipole antenna are computed in a frequency range, and the corresponding time domain fields are obtained using the IFFT.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a strict TD‐CMA formulation was developed for general transmission problems, in which the impulse response between two transmission ports is decomposed into a linear superposition of modal impulse response (MIR) [ 11 ] . Theoretic and numerical results verified the physical information carried by this method for various guided‐ and radiated‐wave transmission mechanisms [ 11 ] . As modern wireless communication systems tend to use an ever‐increasing signal bandwidth, TD behavior of the antennas and other related components is an important metric.…”

Section: Introductionmentioning

confidence: 99%

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Temporal Modal Analysis of Small Radiators

2022

Chinese J of Electronics

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Resonance is a common physical phenomenon in real world, and the modal analysis is a useful tool. Within the regime of electromagnetics, characteristic mode theory is established in frequency domain (FD), and it is doubtful that whether we can find similar modes in time domain (TD). In this paper, resonating modes of a vibrating string are briefly reviewed. Special attentions are paid to the time-domain behaviors of the resonating modes, by following which a temporal modal analysis is proposed. Additionally, a narrow plate is selected as an example since it has a similar structure as the vibrating string. Temporal modal behaviors of the plate are presented and discussed. To further demonstrate this concept, a rigorous analysis of a sphere is provided. A frequency-independent condition is discussed and verified for small objects, and it results in a band-limited constraint. In addition, the temporal modal analysis with excitations is presented, and its potential applications are discussed with emphasis on the analyzing and optimizing transient behaviors of antennas. This work expands largely the field of characteristic mode and may find applications for scattering and antennas.

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“…So, it is difficult to predict its intrinsic physical characteristics such as feed location, surface current distributions, and radiation patterns. The aforementioned issues are resolved by an intuitive classical approach based characteristics mode analysis (CMA) [40][41][42][43][44][45][46][47][48][49][50], as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Characteristics Mode Analysis: A Review of Its Concepts, Recent Trends, State-of-the-Art Developments and Its Interpretation With a Fractal Uwb Mimo Antenna

Mohanty¹,

Behera²

2021

PIER B

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In this article, we present a compact and efficient diametrically-fed dual port fractal UWB MIMO antenna for portable handheld wireless devices. The electromagnetic behaviour on conducting body is analyzed through classical approach based characteristics mode analysis (CMA). Their intrinsic characteristics are explored on the basis of (a) modal surface current distributions, (b) narrow/broad bandwidth capability, and (c) radiation potentials. Concurrent analysis is persuaded on a diametricallyfed dual-port fed fractal conducting surface, which provides interesting facets on the combinatory effect of electromagnetic performance and physical behaviour on metallic radiator, metallic ground planes (unconnected/connected) and combination of two aforementioned metallic compact geometries. Theoretical insights are investigated for essential/non-essential modes existing in proposed geometry. The investigation through CMA also gives plethoric information on the feed location of antenna on modal surface currents and similar trends to capture its radiation potentials on the current nulls existing in the physical body. A broad classification of modes is explained, covering the CMA modal dynamics such as (a) characteristics angle (CA), (b) eigenvalues (EV), and (c) modal significance (MS). These additive parameters in general reflect the resemblance of Q-factor ≈ B.W. for narrowband/wideband traits, electrically/magnetically coupled energy behaviour, and radiative potential for far-field propagation. Thus, in a nutshell , it can be concluded that 'CMA provides physically intuitive guidance for the analysis and designing of antenna structures'. To support the findings highlighted in this particular study, a concise review about the theory of characteristic modes and the practical examples that use such concepts are taken into consideration.

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Time Domain Characteristic Mode Analysis for Transmission Problems

Cited by 3 publications

References 29 publications

Characteristic Modes: Progress, overview, and emerging topics

Characteristic Modes: Progress, overview, and emerging topics

Temporal Modal Analysis of Small Radiators

Characteristics Mode Analysis: A Review of Its Concepts, Recent Trends, State-of-the-Art Developments and Its Interpretation With a Fractal Uwb Mimo Antenna

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