A Compact UWB Koch Fractal Antenna for UWB Antenna Array Applications

This research article describes a technique for realizing wideband dual notched functionality in an ultra-wideband (UWB) antenna array based on metamaterial and electromagnetic bandgap (EBG) techniques. For comparison purposes, a reference antenna array was initially designed comprising hexagonal patches that are interconnected to each other. The array was fabricated on standard FR-4 substrate with thickness of 0.8 mm. The reference antenna exhibited an average gain of 1.5 dBi across 5.25–10.1 GHz. To improve the array’s impedance bandwidth for application in UWB systems metamaterial (MTM) characteristics were applied it. This involved embedding hexagonal slots in patch and shorting the patch to the ground-plane with metallic via. This essentially transformed the antenna to a composite right/left-handed structure that behaved like series left-handed capacitance and shunt left-handed inductance. The proposed MTM antenna array now operated over a much wider frequency range (2–12 GHz) with average gain of 5 dBi. Notched band functionality was incorporated in the proposed array to eliminate unwanted interference signals from other wireless communications systems that coexist inside the UWB spectrum. This was achieved by introducing electromagnetic bandgap in the array by etching circular slots on the ground-plane that are aligned underneath each patch and interconnecting microstrip-line in the array. The proposed techniques had no effect on the dimensions of the antenna array (20 mm × 20 mm × 0.87 mm). The results presented confirm dual-band rejection at the wireless local area network (WLAN) band (5.15–5.825 GHz) and X-band satellite downlink communication band (7.10–7.76 GHz). Compared to other dual notched band designs previously published the footprint of the proposed technique is smaller and its rejection notches completely cover the bandwidth of interfering signals.

Download Full-text

Design of Novel Miniature E-Shape Koch Fractal Antenna for Multiband Characteristics

Indian Journal of Science and Technology ◽

10.17485/ijst/2016/v9i44/98904 ◽

2016 ◽

Vol 9 (44) ◽

Author(s):

P. Prabhu ◽

E. Elamaran

Keyword(s):

Fractal Antenna ◽

Koch Fractal

Download Full-text

Sierpinski Diamond Fractal Antenna Array Using A Quarter-Wave Feed Network for Wireless Applications

Electronics and Communications Engineering ◽

10.1201/9781351136822-3 ◽

2019 ◽

pp. 15-26

Author(s):

D. Prabhakar ◽

P. Mallikarjuna Rao ◽

M. Satyanarayana

Keyword(s):

Antenna Array ◽

Fractal Antenna ◽

Wireless Applications ◽

Quarter Wave ◽

Feed Network

Download Full-text

Modified Koch Fractal Antenna for Multi and Wideband Wireless Applications

ECTI Transactions on Electrical Engineering, Electronics, and Communications ◽

10.37936/ecti-eec.2021192.242065 ◽

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.

Download Full-text

Formation of Fractal Antenna Array for Multiband Applications

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.d8048.118419 ◽

2019 ◽

Vol 8 (4) ◽

pp. 3257-3263

Keyword(s):

Wireless Communication ◽

Antenna Array ◽

Microstrip Antenna ◽

Dielectric Substrate ◽

High Gain ◽

Substrate Material ◽

Vital Role ◽

Fractal Antenna ◽

Self Similarity ◽

Wireless Applications

Antennas play a vital role in wireless communication; a thirst of excellence in this area is unending. Proposed work describes a concept of fractal multiband antenna designed in the hexagon shape. Basically fractal is the concept used in Microstrip antenna for giving better results than conventional Microstrip antenna. By using hexagonal fractal antenna we can possibly achieve the radiation pattern with high gain. The coaxial feeding is used and multiple hexagons are interconnected in array for maintaining conductivity and to preserve electrical self similarity. Hexagonal antenna is used for different wireless applications. The proposed antenna frequency band covers a large number of wireless communication applications including GPS (1.6GHz), Bluetooth (2.4 GHz) & WLAN (3.6GHz). Antenna design has been designed and simulated by using the software Ansoft’s HFSS and parameters like bandwidth return loss, directivity, VSWR are analyzed. Fabrication of the antenna is done by using wet-etching method, on FR-4 dielectric substrate material. Experimental results are taken on Vector Network Analyzer (VNA) and those obtained results were compared with simulated results. The hexagonal fractal antenna array is found to possess predictable multiband characteristics.

Download Full-text