Small and Fractal Antennas

Best, Steven

doi:10.1002/9780470294154.ch10

Cited by 14 publications

(6 citation statements)

References 32 publications

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“…Patch antennas are widely utilized due to their compact form, lightweight nature, and compatibility with Monolithic Microwave Integrated Circuits (MMICs), making them advantageous for various applications [10], [11]. However, a key limitation of patch antennas is their inherent constraint in bandwidth, primarily influenced by the resonance characteristics of the patch structure.…”

Section: Rectangular Electromagnetically Coupled Patch Antenna (Recp)mentioning

confidence: 99%

Antennas for Search and Rescue Using Electromagnetically Coupled Patch and Bow-Tie Structures Based on PDMS

H. Smaili,

Mirza,

Ahmad Sheikh

et al. 2024

IRJIET

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This research aims to develop low-profile rectangular electromagnetically coupled patch and bow-tie antennas using a polymer substrate, specifically designed for search and rescue missions. The antennas are fabricated on a polydimethylsiloxane (PDMS) substrate known for its durability, flexibility, water resistance, and suitability for demanding environments. The search and rescue application requires antennas with longer electrical lengths due to the lower operating frequency of 406 MHz, resulting in larger physical dimensions. To address this, an Electromagnetically Coupling-based antenna approach is employed to ensure a compact form factor. Simulation results demonstrate that both antennas operate at a central frequency of 406 MHz, with the Rectangular Electromagnetically Coupled Patch Antenna exhibiting a bandwidth of 11.93 MHz and the Bow-Tie Antenna showcasing a wider bandwidth of 300 MHz. The fractional bandwidths for the two antennas, expressed with a -10 dB reference level, are found to be 2.93% and 66.66% respectively.

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Section: Rectangular Electromagnetically Coupled Patch Antenna (Recp)mentioning

confidence: 99%

Antennas for Search and Rescue Using Electromagnetically Coupled Patch and Bow-Tie Structures Based on PDMS

H. Smaili,

Mirza,

Ahmad Sheikh

et al. 2024

IRJIET

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“…This guarantees a decrease in overall efficiency, particularly in high Q-factor antennas [50]. Additionally, tunability or the use of broadband multiple resonance matching may benefit from the design of an antenna with specific impedance characteristics, e.g., to increase the radiation resistance [8], [51].…”

Section: The Impact Of Impedance Matching On Q-factor Q Radmentioning

confidence: 99%

Optimal Planar Electric Dipole Antenna

Capek,

Jelinek,

Schab

et al. 2018

Preprint

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Considerable time is often spent optimizing antennas to meet specific design metrics. Rarely, however, are the resulting antenna designs compared to rigorous physical bounds on those metrics. Here we study the performance of optimized planar meander line antennas with respect to such bounds. Results show that these simple structures meet the lower bound on radiation Q-factor (maximizing single resonance fractional bandwidth), but are far from reaching the associated physical bounds on efficiency. The relative performance of other canonical antenna designs is compared in similar ways, and the quantitative results are connected to intuitions from small antenna design, physical bounds, and matching network design.

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“…Compact and multi-band antenna arrays are desirable in personal communication systems, small satellite communication terminals, synthetic aperture radar, unmanned aerial vehicles (UAVs), and other wireless communication systems [1,2]. This type of antenna behaviour can be achieved by fractal antenna arrays, where large arrays are folded into small fractal geometric regions by applying an iterative algorithm, in which an initial structure, called generator, is replicated many times at different regular scales, positions, and directions to grow into the final fractal structure [3,4]. Like conventional antenna arrays, fractal antenna arrays can be divided into three classes: linear, planar, and conformal antenna arrays.…”

Section: Introductionmentioning

confidence: 99%

“…All conventional antenna array designs are band-limited because the frequency of operation depends on the distance between array elements. In contrast, fractal antenna arrays can operate at multiple frequency bands because different parts of the antenna are similar to each other at different scales [4]. The field pattern of conventional and fractal antenna arrays is always designed at a fixed frequency.…”

Section: Introductionmentioning

confidence: 99%

Design of thinned fractal antenna arrays for adaptive beam forming and sidelobe reduction

El‐Khamy

Eltrass

EL-Sayed

2018

IET Microwaves, Antennas & Propagation

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This study introduces, for the first time, a new design methodology that combines the unique multi‐band features of thinned fractal antenna arrays with the adaptive beamforming requirements. The major challenges of fractal array design are the high sidelobe level (SLL), the huge number of elements at higher‐growth stages, and the radiation pattern synthesis. In this study, the ant colony optimisation algorithm is utilised for thinning fractal arrays by estimating the optimum combination of ‘on’ and ‘off’ elements corresponding to lowest possible SLL, while the least mean square algorithm is investigated as an adaptive beamforming method in the proposed design. The capability of the proposed design is demonstrated by investigating hexagonal and pentagonal fractal antenna arrays under various parameter regimes. The results show that the proposed design is much superior in terms of multi‐band frequency operation, array element reduction, and beamforming accuracy. This reveals the effectiveness of the proposed technique as a promising design in smart antenna technology.

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Small and Fractal Antennas

Cited by 14 publications

References 32 publications

Antennas for Search and Rescue Using Electromagnetically Coupled Patch and Bow-Tie Structures Based on PDMS

Antennas for Search and Rescue Using Electromagnetically Coupled Patch and Bow-Tie Structures Based on PDMS

Optimal Planar Electric Dipole Antenna

Design of thinned fractal antenna arrays for adaptive beam forming and sidelobe reduction

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