Carpet Fractal Antenna

Sierpinski carpet geometry based rectangular patch fractal antenna is described in this paper.

Carpet fractal antenna.

Figure 2 shows the design of a sierpinski carpet fractal antenna starting with a rectangular geometry of single patch antenna. This antenna is designed upto first iteration. A dual band antenna using a sierpinski carpet fractal geometry is designed which covers the multiband characteristics of fractals 4. The model of the antenna is as shown in the figure 3.

The fractal carpet antenna is resonating at multiple frequencies. Very broadband and multiband frequency response that derives from the inherent properties of the fractal geometry of the antenna. This type of wideband antenna displays high self similarity and symmetry. This leads to design multiband fractal antenna for wireless communication systems.

As shown in the figure initial design rectangular sierpinski carpet dimensions described abovefor patch is modeled. To validate the impedance bandwidth results the proposed carpet fractal antenna is experimentally tested using a vector network analyzer and the measured results are found to be closely matching with the simulated ones allowing the antenna to be practically suitable for the afore mentioned wireless applications. This is due to the self similarity in the geometry of the antenna. Fractal antenna is widely used due to the following important facts 5.

Fractal antennas are simple light weight and compact in size. Multiband antenna offers multiple telecommunication services in to single device. This fractal structure is implemented on square and several iterations are applied on initial shape. The resonant frequencies for fractal carpet with number of iterations two are shifted left when compared to the number of iterations equal to one.

Different performance parameters like radiation pattern gain voltage standing wave ratio return losses are observed at all the frequencies. The antenna consists of a sierpinski carpet fractal radiator which reduces the overall size of the antenna and it is realized on top of a hilbert slot in the ground layer to achieve required impedance matching. This paper describes the design of modified sierpinski carpet fractal antenna which resonates at six frequencies 4 825 5 455 6 265 ghz and 6 805 8 02 and 9 145 ghz. Design and analysis of new geometry for microstrip patch sierpinski carpet fractal antenna is discussed.