Fractal Multiband Research Articles

A Novel Chrysanthemum-Like Fractal Structure Multi-Band Antenna for Mobile Terminals

This paper incorporates the structural characteristics of chrysanthemums in nature and fractal geometry theory into the antenna structure design and a novel-structured fractal multiband fractal microstrip antenna with a chrysanthemum petal structure is proposed. The antenna can cover commercial frequency bands from the second to fourth generation (4G), satellite navigation, wireless local area networks, and Bluetooth. The antenna radiator imitates the structure of chrysanthemum’s petals in nature, and a basic arc shape is iterated many times according to a certain proportional coefficient. After simulation and comparison, the second iteration can achieve the best antenna performance, and the antenna adopted the coplanar waveguide feeding method to broaden the antenna bandwidth. The antenna covers three effective frequency bands of 1.58–2.68 GHz (64.7%), 2.76–4.01 GHz (33.9%), and 4.68–5.35 GHz (13.4%). The antenna dielectric board is made of FR-4 material, the dielectric constant is 4.4, and the actual size is 41 × 29 × 1.6 mm3. The antenna performs fractal iteration at a small size, and the approximate calculation of the frequency band is completed by comparing the ratio of each ring to the current vector diagram. The design of the antenna is to use HFSS for antenna modeling and parameter optimization, and the model under different conditions were compared and analyzed. By comparing the test results of the antenna prototype with the simulation structure in the electromagnetic anechoic chamber, the rationality of the antenna is verified.

Mutual Coupling Reduction in Multiband MIMO Antenna Using Cross-slot Fractal Multiband EBG in the E-plane

Mutual Coupling Reduction in Multiband MIMO Antenna Using Cross-slot Fractal Multiband EBG in the E-plane

A New Fractal Multiband Antenna for Wireless Power Transmission Applications

The Microwave Power Transmission (MPT) is the possibility of feeding a system without contact by using microwave energy. The challenge of such system is to increase the efficiency of transmitted energy from the emitter to the load. This can be achieved by rectifying the microwave energy using a rectenna system composed of an antenna of a significant gain associated with a rectifier with a good input impedance matching. In this paper, a new multiband antenna using the microstrip technology and fractal geometry is developed. The fractal antenna is validated into simulation and measurement in the ISM (industrial, scientific, and medical) band at 2.45 GHz and 5.8 GHz and it presents a wide aperture angle with an acceptable gain for both bands. The final antenna is printed over an FR4 substrate with a dimension of 60 × 30 mm2. These characteristics make the antenna suitable for a multiband rectenna circuit use.

Design of a Novel Fractal Multiband Planar Antenna with a CPW-Feed

Design of a Novel Fractal Multiband Planar Antenna with a CPW-Feed

Fractal multiband antennas based on lotus‐pod patterns

Fractal multiband antennas based on lotus‐pod patterns

Fractal multiband antennas based on lotus‐pod patterns

AbstractA novel microstrip antenna constructed with a lotus‐pod pattern is presented in this Letter. It exhibits a frequency‐independent antenna after a self‐similar design. In practice, the multiband spectrum depends on the iteration of the fractal pattern. Both outward and inward iteration approaches are introduced. Experimental results with multiband spectrums and radiation patterns are presented and discussed. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 223–228, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10282

Generalized Sierpinski fractal multiband antenna

A new set of fractal multiband antennas called mod-p Sierpinski gaskets is presented. Mod-p Sierpinski fractal antennas derive from the Pascal triangle and present a log-periodic behavior, which is a consequence of their self-similarity properties. Mod-p Sierpinski fractal antennas constitute a generalization of the classical Sierpinski antenna.

On the application of parametric models to the transient analysis of resonant and multiband antennas

The transient responses of a resonant antenna and a fractal multiband antenna, both formed by conducting surfaces, are calculated. The surfaces are modeled by planar triangular patches and the study is carried out by solving the time-domain electric-field integral equation (TD-EFIE). Linear parametric modeling techniques are applied to considerably reduce the computation time. Numerical results are compared with experimental measurements.

Fractal multiband antennabased on the Sierpinski gasket

Experimental and computed results show a multiband behaviour over five bands for the new fractal Sierpinski antenna. Such a behaviour is based on the self-similarity properties of the antenna's fractal shape, which might open an alternative way for designing new multiband and frequency independent antennas.