Iteration Fractal Antenna Research Articles

Compact Fifth Iteration Fractal Antenna for UWB Applications

Compact Fifth Iteration Fractal Antenna for UWB Applications

High Directivity Broadband Hexagonal Fractal Ring Antenna with Modified Ground

A highly directive fractal antenna with a novel shape is proposed in this paper. Finite Element Method based simulations were carried out on the first three iterations of a hexagonal fractal ring and the performance was measured in terms of the resonant behavior, directivity, radiation efficiency, current distribution, and radiation pattern. The second iteration fractal antenna radiates well along the broadside direction at the fundamental mode of operation. The ground plane was modified to improve the performance further. The antenna, etched on an FR4 substrate, has a directivity of 11.8 dB along the broadside direction with multi-frequency broadband performance over the frequency range of 3.12-7.46 GHz. Therefore, the proposed fractal antenna can be used for Wireless LAN applications. The antenna was fabricated and measured in order to validate the results.

Elliptical monopole based super wideband fractal antenna

AbstractAn elliptical monopole based third iterative fractal antenna for super wideband applications is investigated in this article. It consists of microstrip line fed three iterations of elliptical monopole in tree shaped manner and modified semielliptical ground plane. It has an impedance bandwidth of 0.65 to 35.61 GHz, that is, ratio bandwidth of 54.78:1. The overall footprint of the antenna is 170 × 150 mm2. A peak realized gain of 6.51 dB with an average gain of 3.24 dB is achieved. The investigated antenna has advantages of miniaturized dimensions, simple geometry, and wider bandwidth over previously reported structures.

A super wideband circular-shaped fractal antenna loaded with concentric hexagonal slots

This article presents a super wideband (SWB) circular-shaped fourth iterative fractal antenna loaded with concentric hexagonal slots. A tapered microstrip feed and a partial ground plane is used. It has a total size of 40 × 27 × 1.6 mm3. Numerical results of the antenna show that it provides a bandwidth from 1.43 GHz to more than 40 GHz (percentage bandwidth greater than 186%) with a bandwidth ratio of approximately greater than 28:1 for S11 < -10 dB. A prototype of the proposed antenna has been fabricated and its performances are measured up to 15 GHz. A good agreement is achieved between the numerical and experimental reflection coefficient, VSWR and input impedance. Measured radiation patterns at different frequencies and simulated peak gain are presented and discussed. It has the advantages of super wide bandwidth and compact size. The developed antenna is suitable for various wireless communications such as GPS, GSM, UMTS, ISM and UWB.

Hexagonal tree shaped ultra–wideband fractal antenna

ABSTRACTA compact hexagonal tree shaped fractal antenna for ultra–wideband (UWB) applications is presented. The bandwidth has been enhanced by using modified feedline and semi-circular ground plane. The impedance bandwidth of 2.5–16 GHz (146%) has been achieved. The proposed second iteration fractal antenna has nearly omnidirectional patterns at its resonance frequencies with an average gain of 4 dB. The simulation and experimental results are found to be in good agreement. The antenna exhibits better reflection coefficient performance along with reduced dimensions as compared to ones reported earlier.

Verification of Multiband Characteristics in Iterative Fractal Antenna

This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and er = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.

Verification of Multiband Characteristics in Iterative Fractal Antenna

This paper presents verification of multi-band characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and er = 4.3). The antenna is co-axially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multi-band wireless communications due its smaller size, low cross polarization and multi-band behavior.