scholarly journals Design and Testing of Fractal Antenna Parameters based on the Koch Curve for Reception of Digital Terrestrial Television Signals in the UHF Band

2019 ◽  
Vol 11 (1) ◽  
pp. 159-172
Author(s):  
Pablo Lupera Morillo ◽  
Gary Flores Cadena ◽  
Ricardo Merizalde
Keyword(s):  
Fractal Geometry ◽  
Laboratory Tests ◽  
Network Analyzer ◽  
Fractal Antenna ◽  
Koch Curve ◽  
Radiation Characteristics ◽  
Digital Terrestrial Television ◽  
To Receive ◽  
Design And Testing ◽  
Uhf Band

Purpose – In this research paper, the electrical and radiation characteristics of a proposed fractal antenna based on the Koch curve in the second iteration for reception of digital terrestrial television signals are designed and analyzed by laboratory tests. Methodology/approach/design – The design is based on the concepts of fractal geometry and on a previously designed antenna, which is adapted to obtain a different frequency of operation; the designed antenna is constructed in three different ways, finally, they are tested in the lab using vector-network-analyzer, that allows to measure parameters, such as: VSWR, gain and radiation pattern. Findings – The fractal antenna based on the Koch curve has the necessary characteristics to receive digital terrestrial television signals in the UHF band.

scholarly journals Performance analysis of first iteration koch curve fractal log periodic antenna of varying flare angles

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Ashutosh Singh ◽  
Reneez Kabeer ◽  
Z. Ali ◽  
V. Singh ◽  
M. Shukla
Keyword(s):  
Performance Analysis ◽  
Fractal Geometry ◽  
Return Loss ◽  
Broad Band ◽  
Fractal Antenna ◽  
Recent Past ◽  
Koch Curve ◽  
Log Periodic Antenna ◽  
Simulation Results ◽  
Fractal Antennas

AbstractMiniaturization has always been a crucial challenge in the field of antenna engineering. In the recent past a number of researchers have shown that fractal geometry have potential to design smaller, broad band and multi band antennas. In this proposed work performances of log periodic fractal antennas of different flare angles have been investigated. Simulation results show that fractal log periodic antenna gives better performance in terms of gain, return loss and directivity. Performance of log periodic fractal antenna has also been investigated for flare angles 30°, 45°, 60°, 70° and 80°. In this proposed work fractal antenna gives best performance with 60° flare angle.

scholarly journals A novel compact stair-shaped multiband fractal antenna for wireless communication systems

2021 ◽  
Vol 72 (5) ◽  
pp. 306-314
Author(s):  
Zain ul Abidin Jaffri ◽  
Zeeshan Ahmad ◽  
Asif Kabir ◽  
S. Sabahat ◽  
H. Bukhari
Keyword(s):  
Fractal Geometry ◽  
Communication Systems ◽  
Data Communication ◽  
Wireless Communication Systems ◽  
Fractal Antenna ◽  
Multiple Frequency ◽  
Radiation Characteristics ◽  
The Third ◽  
Self Similar ◽  
Good Agreement

Abstract The growing demand for enhanced capacities, broadband services, and high transmission speeds to accommodate speech, image, multimedia, and data communication simultaneously puts a requirement for antenna to operate in multiple frequency bands. A novel compact fractal antenna based on self-similar stair-shaped fractal geometry is proposed in this paper. The fractal antenna is designed by modifying the patch antenna through the iterative process using stair-shaped fractal geometry. The third iteration results in a tri-band response, and the antenna resonate at 3.65, 4.825, and 6.325 GHz with impedance bandwidths of 75.6, 121.2, and 211.4 MHz, respectively. The antenna is designed in CST Microwave studio, and evaluated for operating bands and radiation characteristics. Prototype for the third iteration of the fractal antenna is fabricated on FR-4 substrate which is further tested for measured operating bands and radiation characteristics. The simulated and measured results show good agreement.

Fractal Koch curve for UHF band application

2007 ◽  
Author(s):  
Mohd Nazri A. Karim ◽  
Mohamad Kamal A. Rahim ◽  
Mohamad Irfan ◽  
Thelaha Masri
Keyword(s):  
Koch Curve ◽  
Uhf Band

scholarly journals Modified Koch Fractal Antenna for Multi and Wideband Wireless Applications

2021 ◽  
Vol 19 (2) ◽  
pp. 182-189
Author(s):  
Shweta Rani ◽  
Sushil Kakkar
Keyword(s):  
Numerical Simulations ◽  
Impedance Matching ◽  
Optimization Procedure ◽  
Design Parameters ◽  
Impedance Bandwidth ◽  
Fractal Antenna ◽  
Bacterial Foraging Optimization ◽  
Koch Curve ◽  
Wireless Applications ◽  
Koch Fractal

This paper focuses on the design and development of modified Koch fractal antenna. Compared to traditional Koch curve antenna, the presented antenna possesses a greater number of frequency bands and better impedance matching. Furthermore, the bacterial foraging optimization (BFO) approach is implemented to enhance the impedance bandwidth. The developed technique has been verified by employing various numerical simulations. The design parameters generated from the optimization procedure have been utilized to manufacture the antenna and the respective experimental and simulated results compared. The measured results show that the designed antenna exhibits multi and wideband behavior, covering WLAN, WIMAX, and various other wireless applications.

scholarly journals A Dual-Band Compact Metamaterial Absorber with Fractal Geometry

Electronics ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 879 ◽  
Author(s):  
Francesca Venneri ◽  
Sandra Costanzo ◽  
Antonio Borgia
Keyword(s):  
Fractal Geometry ◽  
Metamaterial Absorber ◽  
Dual Band ◽  
Substrate Thickness ◽  
Dual Frequency ◽  
Full Wave ◽  
Measurement Results ◽  
Uhf Band

A fractal absorber based on a metamaterial configuration is proposed for dual-frequency operation within the UHF band. The miniaturization skills of the proposed fractal shape are used to design a dual-band metamaterial absorber cell with reduced size (<λ/2 at the two operating frequencies) and a very thin substrate thickness (≅λ/100). A metamaterial absorber panel is realized and experimentally validated. Good agreements between full-wave simulations and measurement results are demonstrated.

scholarly journals A Second-Iteration Square Koch Fractal Slot Antenna for UHF Downlink Telemetry Applications in CubeSat Small Satellites

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Jorge Simon ◽  
Jorge Flores-Troncoso ◽  
Jose Luis Alvarez-Flores ◽  
Leonel Soriano-Equigua ◽  
Marco Cardenas-Juarez ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Fractal Geometry ◽  
Low Cost ◽  
Economic Cost ◽  
Slot Antenna ◽  
Limited Area ◽  
Cost Difference ◽  
Small Satellites ◽  
Koch Fractal ◽  
Uhf Band

This article presents the design, fabrication, and measurement of a square Koch fractal slot antenna for UHF band using both the FR4-G10 and Cuclad 250 substrates. Conveniently, this 56.56 cm full-length antenna possesses a geometry that allows it to be incorporated into the standardized 10 cm × 10 cm faces of the CubeSats. Furthermore, it is shown that both selected substrates exhibit an acceptable performance at the frequency of interest despite the economic cost difference and relative permittivity. Hence, the commercial FR4-G10 antenna substrate can be preferred because of its low-cost and admissible performance at 458 MHz, which is a frequency in the UHF band that is commonly used for telemetry, tracking, and command downlinks of CubeSats. Measurements show that the proposed antenna exhibits a reflection coefficient of −16.53 dB, a bandwidth of 22.62 MHz at −10 dB, a VSWR of 1.3508, a normalized impedance of 0.794 − j0.173 at 50 Ω, and a directivity of 2.24 dBi. The contribution of this work consists in the use of a fractal geometry to construct a low-cost slot antenna working at UHF frequencies over the limited area of the CubeSat faces and in order to optimize the area for an eventual coexistence with solar cells.

Compact hybrid fractal antenna for wideband wireless applications

2016 ◽  
Vol 9 (5) ◽  
pp. 1191-1196 ◽  
Author(s):  
Yogesh Kumar Choukiker ◽  
Jagadish Chandra Mudiganti
Keyword(s):  
Impedance Matching ◽  
Ground Plane ◽  
Fractal Antenna ◽  
Koch Curve ◽  
Antenna Structure ◽  
Wireless Applications ◽  
Antenna Performance ◽  
Compact Size ◽  
Measured Impedance ◽  
Acceptable Agreement

A compact size hybrid fractal antenna is proposed for the application in wideband frequency range. The proposed antenna structure is the combination of Koch curve and self-affine fractal geometries. The Koch curve and self-affine geometries are optimized to achieve a wide bandwidth. The feed circuit is a microstrip line with a matching section over a rectangular ground plane. The measured impedance matching fractal bandwidth (S11 ≤ −10 dB) is 72.37% from 1.6 to 3.4 GHz. An acceptable agreement is obtained from the simulated and measured antenna performance parameters.

Pengembangan Infrastruktur Pembelajaran Daring Menggunakan Antena Unidirectional

2021 ◽  
Vol 5 (4) ◽  
pp. 760-767
Author(s):  
Rufman Akbar ◽  
Chaerul Anwar ◽  
Johannes Hamonangan Siregar
Keyword(s):  
Internet Connection ◽  
Network Connection ◽  
Marginal Areas ◽  
Infrastructure Design ◽  
Signal Amplifier ◽  
Network Quality ◽  
Client Side ◽  
To Receive ◽  
Design And Testing ◽  
Network Device

Situation during COVID19 pandemic, requires all schools to conduct online learning. This condition is done to prevent the spread of pandemic. The problem is that the infrastructure is not fully supported. Learning in marginal areas is still constrained by the difficulty of the signal or internet connection. This research was conducted to obtain an infrastructure design that can be used in areas with minimal internet connection, or even no internet network connection. Using R&D, the research begins by designing a network device on the school side – Acces Point, also a tool to expand coverage -  repeater. Furthermore, design and testing of signal amplifier antennas that can be used on the client side is carried out. For the client side, several types of amplifier antennas are made that can be used to receive Wifi frequencies. There are three types of antennas that are made and tested, namely Yagi, Yagi Cross, and cantennas. Both are Unidirectional antenna. Connection quality is measured with a Wifi analyzer device to determine network quality. As for mobile phones, it is measured using the Wifi Master Key. The result obtained is a WELAN infrastructure design which is equipped with unidirectional antenna design with a total range of 8 Km.  

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