High directivity modes in the Koch island fractal patch antenna

Romeu, J.; Borja, C.; Blanch, S.

doi:10.1109/aps.2000.874568

Cited by 20 publications

(7 citation statements)

References 4 publications

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“…Microstrip patch radiators exhibit a gain of an approximate range of 5-10 dBi [1], depending on several parameters such as the properties of the used substrate (height, relative permittivity), the width/length ratio (W/L) of the patch radiator, and the dimensions of the ground plane. There are several standard techniques to enhance the gain, including the use of superstrate dielectric layers with high permittivity [2,3], stacked parasitic patch arrangement [4], or extension of effective aperture by localization of higher-order modes in fractal patch antennas [5,6]. The novel technique presented here has similar physical basis to that reported in [5,6].…”

Section: Introductionmentioning

confidence: 85%

“…There are several standard techniques to enhance the gain, including the use of superstrate dielectric layers with high permittivity [2,3], stacked parasitic patch arrangement [4], or extension of effective aperture by localization of higher-order modes in fractal patch antennas [5,6]. The novel technique presented here has similar physical basis to that reported in [5,6]. It is based on extension of a source area, maintaining in-phase current distribution of higher-order mode on the dominant part of the patch.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Gain Microstrip Patches Operating on Higher Order Modes

Polívka

Holub

2007

International Journal of Microwave Science and Technology

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Novel topologies of rectangular microstrip patches providing broadside radiated one point fed radiators with enhanced gain are compared. The principle of the gain enhancement is based on an extension of a source area. Dominant in-phase current distribution on the patch is maintained by using higher order mode and geometrical modification of the patch topology. That is achieved by introducing suitable perturbation elements in the shape of slots and notches. Two principal patch topologies operating on TM21 and TM03 modes are described. A comparison of simulated and measured properties of realized prototypes at 10 GHz band are presented. The results show that gain 12.3 dBi of single patch can be reached.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Enhanced Gain Microstrip Patches Operating on Higher Order Modes

Polívka

Holub

2007

International Journal of Microwave Science and Technology

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“…due to their multi-frequency operability, high gain/directivity, improved bandwidth and smaller physical dimensions [2]. Examples of small fractal antennas with high directivity based on the Sierpinski bowtie [3], Sierpinski Gasket [4], Sierpinski bow-tie [5], Sierpinski carpet [6], Koch Island [7], Koch Snowflake [8], fork [9] and Mandelbrot [10] etc. can be found in literature.…”

Section: Introductionmentioning

confidence: 99%

High Directivity Broadband Hexagonal Fractal Ring Antenna with Modified Ground

et al. 2020

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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.

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“…Various methods to improve the directivity of patch antennas have been reported in the literature, e.g., Sierpinski fractal patch [2], Koch island fractal patch [3,4] and Koch island fractal boundary patch [5]. Design of patch antennas based on the Sierpinski fractal method has kept the size of the antennas small with a patch size of 40 mm × 40 mm to achieve a directivity of 10.9 dBi at 3.866 GHz [2].…”

Section: Introductionmentioning

confidence: 99%

“…Design of patch antennas based on the Sierpinski fractal method has kept the size of the antennas small with a patch size of 40 mm × 40 mm to achieve a directivity of 10.9 dBi at 3.866 GHz [2]. Koch island fractal antenna presented in [3] shows a directivity of 13 dBi with an air gap so that the total height of the antenna is 3.5 mm. Both techniques rely on the use of a higher order mode supported by fractallike structures called localized modes.…”

Section: Introductionmentioning

confidence: 99%

A High-Directivity Microstrip Patch Antenna Design by Using Genetic Algorithm Optimization

Jayasinghe¹,

Anguera²,

Uduwawala³

2013

PIER C

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Abstract-A high-directivity patch antenna with broadside directivity is attractive, since a narrow beam can be obtained without the need of using an array of antennas. Therefore, the solution becomes simpler as there is no need for a complicated feeding network. In this sense, this paper presents a novel patch antenna design with high directivity in the broadside direction by using genetic algorithms (GA). The proposed GA method divides the overall patch area into different cells taking into account that cells have a small overlap area between them. This avoids optimized geometries where cells have only an infinitesimal connection. Therefore, the proposed method is robust for manufacturing. The antenna operates in a higher-order mode at 4.12 GHz and the geometry fits inside a patch of 40 mm × 40 mm on a substrate with a relative permittivity of 3.38 and a thickness of 1.52 mm resulting in a directivity of 10.5 dBi. The specialty of this design is the use of GA to select the optimized shape and the feeding position instead of a known shape and a fixed feeding position. The antenna has been fabricated and the simulation results are in good agreement with the measurements. This results in a simpler design of a single high-directivity patch, which can substitute an array of two elements operating in the fundamental mode.

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High directivity modes in the Koch island fractal patch antenna

Cited by 20 publications

References 4 publications

Enhanced Gain Microstrip Patches Operating on Higher Order Modes

Enhanced Gain Microstrip Patches Operating on Higher Order Modes

High Directivity Broadband Hexagonal Fractal Ring Antenna with Modified Ground

A High-Directivity Microstrip Patch Antenna Design by Using Genetic Algorithm Optimization

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