Miniaturization of a Koch-Type Fractal Antenna for Wi-Fi Applications

Tumakov, Dmitrii; Chikrin, Dmitry; Kokunin, P. A.

doi:10.3390/fractalfract4020025

Cited by 19 publications

(7 citation statements)

References 26 publications

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“…7 shows the fractal design of the millimeter wave broadband antenna, and Fig. 8 shows the antenna radiation pattern [44][45].…”

Section: B Fractal Based Broadband Antennamentioning

confidence: 99%

Millimeter-Wave Broadband Antenna: A Review and Current State of the Art

Tiwari,

Pal

2023

Mikrotalasna revija = Microwave Review

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A broadband antenna can transmit and receive radio signals across a broad frequency spectrum. The use of broadband millimeter-wave (mmWave) band antennas has garnered significant interest in wireless communication research. As a result, this type of antenna finds applications in television, radio broadcasting, and radar communication. The millimeterwave broadband antenna covers an extensive range of frequencies, leading to distinct design methodologies for such structures. The primary focus of this manuscript is to present a comprehensive overview of the recent developments in millimeter-wave antenna design, encompassing an in-depth analysis of the working principles of broadband antennas and their associated design characteristics. This review aims to shed light on the challenging path for antenna researchers and the potential enhancements achievable through broadband antenna technologies. Various applications, including enhanced wireless communication, high-definition and ultra-high-definition multimedia, and security signal intelligence, necessitate high data rates and significantly greater bandwidth. Consequently, a substantial demand for millimeter-wave broadband antennas can cater to these requirements.

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“…7 shows the fractal design of the millimeter wave broadband antenna, and Fig. 8 shows the antenna radiation pattern [44][45].…”

Section: B Fractal Based Broadband Antennamentioning

confidence: 99%

Millimeter-Wave Broadband Antenna: A Review and Current State of the Art

Tiwari,

Pal

2023

Mikrotalasna revija = Microwave Review

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“…Departing from the conventional use of metal mesh as a ground plate [33,34], this approach positions the metal mesh at the top layer to simultaneously enhance flexibility and transparency. Fractals are commonly used in electronic devices to enable multi-band operation or miniaturization [35][36][37][38][39]. In this study, fractals were used to optimize the resonant frequency within the targeted X-band.…”

Section: Introductionmentioning

confidence: 99%

Screen-Printed Metamaterial Absorber Using Fractal Metal Mesh for Optical Transparency and Flexibility

Choi,

Lim,

Lim

2024

Fractal Fract

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In stealth applications, there is a growing emphasis on the development of radar-absorbing structures that are efficient, flexible, and optically transparent. This study proposes a screen-printed metamaterial absorber (MMA) on polyethylene terephthalate (PET) substrates using indium tin oxide (ITO) as the grounding layer, which achieves both optical transparency and flexibility. These materials and methods enhance the overall flexibility and transparency of MMA. To address the limited transparency caused by the silver nanoparticle ink for the top pattern, a metal mesh was incorporated to reduce the area ratio of the printed patterns, thereby enhancing transparency. By incrementing the fractal order of the structure, we optimized the operating frequency to target the X-band, which is most commonly used in radar detection. The proposed MMA demonstrates remarkable performance, with a measured absorption of 91.99% at 8.85 GHz and an average optical transmittance of 46.70% across the visible light spectrum (450 to 700 nm), indicating its potential for applications in transparent windows or drone stealth.

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“…Therefore, the need for miniaturized antennas that provide broadband coverage continues to grow. For miniaturized antennas, mainly microstrip patch antennas have been studied [13][14][15][16][17][18][19]. However, the narrow band of patch antennas limits their broadband applicability.…”

Section: Introductionmentioning

confidence: 99%

Miniaturization and Bandwidth Enhancement of Fractal-Structured Two-Arm Sinuous Antenna Using Gap Loading with Meandering

Kim,

Keun,

Yoo

et al. 2023

Fractal Fract

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A sinuous antenna is a frequency-independent antenna known for its wide bandwidth and consistent gain, which makes it valuable in broadband applications such as ultrawideband (UWB) radar and ground-penetrating radar (GPR). However, sinuous antennas tend to be rather large. Consequently, numerous studies have explored miniaturization methods, with the gap-loading method emerging as a prominent approach. Unfortunately, it is still difficult to achieve broad bandwidths for conventional miniaturized sinuous antennas. In this paper, we use a novel approach incorporating a meander shape into the sinuous curve and employing gap loading with meandering. This innovative technique results in the development of a fractal-structured two-arm sinuous antenna characterized by an ultra-compact size and significantly expanded bandwidth. Adding a meander line in the outermost part maximizes the capacitance, thereby enhancing the gap-loading effect and minimizing the overall size of the sinuous antenna. In addition, the introduction of an inner meander line increases the inductance, contributing to a further expansion of the antenna’s bandwidth. For example, the electrical length of the antenna without the meander line is 0.552 × 0.552 × 0.052 λg3, while the electrical length of the antenna with the meander line is only 0.445 × 0.445 × 0.036 λg3, i.e., 19.4% smaller. The antenna lacking the outermost meander line exhibits a 10 dB impedance bandwidth, spanning from 0.74 to 10.53 GHz. In contrast, the antenna featuring the outermost meander line has a 10 dB impedance bandwidth, extending from 0.51 to 10.72 GHz, which results in a remarkable enhancement in the fractional bandwidth (by 8.1%). Hence, the proposed antenna design is a good candidate for broadband applications that require miniaturization.

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Miniaturization of a Koch-Type Fractal Antenna for Wi-Fi Applications

Cited by 19 publications

References 26 publications

Millimeter-Wave Broadband Antenna: A Review and Current State of the Art

Millimeter-Wave Broadband Antenna: A Review and Current State of the Art

Screen-Printed Metamaterial Absorber Using Fractal Metal Mesh for Optical Transparency and Flexibility

Miniaturization and Bandwidth Enhancement of Fractal-Structured Two-Arm Sinuous Antenna Using Gap Loading with Meandering

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