New antenna mode generation based on theory of characteristic modes

Ghalib, Asim; Sharawi, Mohammad S.

doi:10.1002/mmce.21686

Cited by 9 publications

(8 citation statements)

References 40 publications

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“…In that case, it is considered as an important guiding parameter for the antenna design to determine the appropriate feed point and feed structure. To gain deeper insights about such analysis, we must understand the relationship between characteristics modes and energy [52][53][54][55][56]. The energy that is stored in the form of reactive power (P X ) & radiated power (P R ) gives the eigenvalues (λ n ).…”

Section: Cma Approach On Perfectly Conducting Surfacementioning

confidence: 99%

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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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Section: Cma Approach On Perfectly Conducting Surfacementioning

confidence: 99%

“…where * is the conjugate operator, and δ mn is the delta function. Depending upon such orthogonality property, the modal significance (MS) [56] can be computed [based on the weighted eigenvalues (λ n )]. It can be elaborated:…”

Section: Cma Approach On Perfectly Conducting Surfacementioning

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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“…For the ease of understanding, some equations of TCM are briefly discussed below. More details about TCM analyses are available in [14][15][16][17][18][19][20][21][22][23][24].…”

Section: Theory Of Characteristics Mode Analysismentioning

confidence: 99%

“…TCM analysis is also a good tool for antenna placement studies for platforms that are inherently part of the radiator. In recent times, TCM has been applied in designing many wideband antennas [18][19][20][21][22][23][24]. However, many of these antennas lacked stable radiation patterns while trying to achieve wide IBW.…”

Section: Introductionmentioning

confidence: 99%

A Circularly Polarized Quad-Band Annular Ring Antenna With Asymmetric Ground Plane Using Theory of Characteristic Modes

Dhara¹,

Yadav²,

Sharma³

et al. 2021

PIER M

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Herein a theory of characteristic mode (TCM)-based design of circularly-polarized (CP) quad-band compact microstrip antenna is proposed. It involves one annular ring radiator having eight symmetrical slots along its boundary and three circular closed ring resonators (CRRs) on the bottom side of the substrate. Initially, CM analysis was carried out for the radiator without a feeding structure, to determine the modal currents and their corresponding modal fields (radiation patterns) of existing modes. This helped in recognizing the symmetric modes to be selectively excited by the feed to furnish CP and gave direction for selecting an asymmetric CPW-fed structure as the feed of choice. Evolution process of the antenna geometry shows that the eight symmetrical slots in tandem with the CRRs generate wide impedance bandwidth (IBW), while measured quad CP bands are obtained through uses of an asymmetric ground plane resonating at 5.63 GHz (120 MHz), a cross-shaped slit at 7.69 GHz (650 MHz), a rectangular open loop at 9.91 GHz (1200 MHz), and a tuning stub in the feeding structure at 12.09 GHz (160 MHz). Series of parasitic strips augmented CP radiation and eliminate ripples in the radiation pattern. Measured findings relate satisfactorily with simulations done using Ansys HFSS 2020 R1. A low cost FR-4 substrate is used to fabricate the antenna with an optimized dimension of 35 × 30 × 1.6 mm 3. The measured IBW ranges from 4.36-4.82 GHz, 5.50-5.78 GHz, and 5.95-beyond 14 GHz. The proposed antenna may find suitable applications in C band, X band, and 5 GHz WLAN devices.

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“…It provides fascinating physical insights into current and radiation phenomena of each mode of an arbitrarily shaped radiating body taking place in various kinds of antennas and could be efficiently optimized along with choice of feed technique to excite desired modes [4]. Numerous antennas for various wireless communication applications based on TCM have been reported [5][6][7][8][9][10][11][12]. It is used for the analysis and design of different categories of antennas such as an ultra-wideband (UWB) antennas [7,8], planar bevel-shaped and C-shaped monopole antennas [9,10], loop and printed inverted-F antennas [11], and slotline antennas [12] for diverse applications.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized Multistubs Loaded Rectangular Monopole Antenna for Multiband Applications Based on Theory of Characteristics Modes

Kumar¹,

Deegwal²,

Sharma³

2019

PIER C

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A miniaturized rectangular monopole antenna (RMA) integrated with a T-shaped stub, inverted long and short L-shaped stub resonators based on application of the theory of characteristic modes (CMs) is investigated for multiband operation. CMs of embedded multistubs resonators on the RMA are examined and perceived that the entire structure is able to excite magnetic and electric CMs, in which three valuable CMs at 2.69/3.68/5.35 GHz are attained to cover WiMAX and WLAN bands. Based on CM analysis, the design formulation of multistubs resonators loaded antenna is presented. The proposed multiband antenna has been fabricated, tested, and experimentally characterized. The measured fractional bandwidths (FBWs) are 7.03% (180 MHz, 2.47-2.65 GHz), 10.43% (360 MHz, 3.27-3.63 GHz), and 11.42% (630 MHz, 5.20-5.83 GHz). The antenna exhibits isolated multiple frequency bands, stable monopole-like radiation patterns, and flat realized gains over the operating resonance bands while maintaining the small antenna size.

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New antenna mode generation based on theory of characteristic modes

Cited by 9 publications

References 40 publications

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

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

A Circularly Polarized Quad-Band Annular Ring Antenna With Asymmetric Ground Plane Using Theory of Characteristic Modes

Miniaturized Multistubs Loaded Rectangular Monopole Antenna for Multiband Applications Based on Theory of Characteristics Modes

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